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Journal Details
Format
Journal
eISSN
2083-4608
First Published
26 Feb 2008
Publication timeframe
4 times per year
Languages
English

Search

Volume 44 (2017): Issue 1 (December 2017)

Journal Details
Format
Journal
eISSN
2083-4608
First Published
26 Feb 2008
Publication timeframe
4 times per year
Languages
English

Search

22 Articles
Open Access

Controlling the Operation Process of the Unmanned Aerial System

Published Online: 28 Jul 2018
Page range: 5 - 36

Abstract

Abstract

The development of unmanned aerial systems (UAS) encountered the problem of controlling the process of technical operation. The literature that is available to the authors lacks credible information concerning the principles of specifying the strategy and control of the process of UAS operation. Hence, it is necessary to recognise and interpret the basic UAS operation features. The purpose of the publication is to present the properties of the UAS as an object of operation and the mutual relation of the technical operation process with the UAS’ technical condition alteration process. We present the results of analyses in terms of functionality and the UAS’ utility potential. The publication pays special attention to the properties of the UAS as an object of operation. The paper includes the analysis of the UAS operation principles and the specification of the advantage and disadvantage of those principles, i.e. using a non-repairable UAS until damaged, using a repairable UAS until damaged, periodical technical servicing, continuous diagnostic operation. The proposals for the control models in the UAS operation system have also been included.

Keywords

  • unmanned aerial system
  • technical operation
  • servicing
  • technical condition
  • damage
Open Access

Applying Pareto Frontier to Determine Control Strategy of Technical Objects Operation Process

Published Online: 28 Jul 2018
Page range: 37 - 57

Abstract

Abstract

The paper deals with the multi-criteria model of technical objects operation process control in which the choice of control strategy is made with the use of nondeterministic methods. The decisive model was created with the use of decisive theories of semi-Markov processes. The choice of the optimum (quasi-optimum) solution is made with the use of simulated annealing algorithm. As a result of numeric calculations for used criteria functions (availability, risk), a set of quasi-optimum solutions in the form of Pareto frontier is obtained.

Keywords

  • control strategy
  • Pareto front
  • availability
  • risk
Open Access

Method of Availability Control in the Transport System using Simulation Model of Operation and Maintenance Process

Published Online: 28 Jul 2018
Page range: 59 - 79

Abstract

Abstract

The paper presents the description of algorithm for calculation characteristics of simulation model for the operation and maintenance process of transport means. The model presented in the paper constitutes an integral element of the developed complex method of quality control in elaborate technical object performance systems. In the example presented in the paper, the evaluation criteria consist of the availability of technical object as well as unit profit generated in the states of the modeled operation and maintenance process. On the basis of the results of research carried out at an existing operation and maintenance system, entry data for the model were obtained and simulation experiments were carried out.

Keywords

  • simulation model
  • availability
  • unit profit
  • transport means
Open Access

Method of Determining the Required Number of Technical Backup Area Posts

Published Online: 28 Jul 2018
Page range: 81 - 96

Abstract

Abstract

In complex operation systems, the processes of rendering technical objects roadworthy are carried out at specifically designed technical backup area posts. The article presents the method of defining the number of technical backup area posts required for appropriate functioning of assigned service and repair task. Then typical calculation results are presented in charts prepared on the basis of data obtained from tests at existing transport means operation system. The presented method makes it possible to analogically determine the minimum required number of posts for carrying out the assigned service and repair task for both a subsystem comprised of a group of units a given group of posts or an individual post in traffic maintenance and intervention subsystems.

Keywords

  • service and repair
  • number of posts
  • availability
Open Access

Implementation of Modular Trucks into Road Transport

Published Online: 28 Jul 2018
Page range: 97 - 118

Abstract

Abstract

In this article, an analysis of modular truck application in the road transport in Poland has been made. Terminology has been unified. Classification and law regulations applicable in different European countries and all over the world have been discussed. An analysis of existing solutions has been made and an optimal variant for road freight transport, including the condition and parameters of the road infrastructure in Poland, has been proposed. The study presents initial conceptual assumptions of this project as well as advisability of using these modular trucks, on the basis of a selected research object – the analyzed transport company. On this example, an analysis of costs and potential profits to be generated from transport services performed using the proposed modular trucks and with reference to costs borne by the investigated company with the use of currently operated transport means, has been made.

Keywords

  • road transport
  • modular trucks
  • efficiency
  • costs of operation
Open Access

Numerical Simulation of the Process of a Technical Object State Changes

Published Online: 28 Jul 2018
Page range: 119 - 140

Abstract

Abstract

The article presents a construction method and an example of a model of a technical object operation process as well as the main stochastic assumption which is a mathematical model of an object state changes. The model of the operation process was built using an analysis of the state space and operation-related events of the analyzed technical objects. An example of numerical simulation of the technical object state change process as a tool to be used to support the analysis of the considered process. Numerical simulation of the stochastic process being a model of a technical object state change process makes it possible to determine the process characteristics impossible to determine in an analytical way.

Keywords

  • numerical simulation
  • operation process
  • stochastic process
  • object state
  • operation-related state
Open Access

Simulation of Automotive Starter Faults

Published Online: 28 Jul 2018
Page range: 141 - 158

Abstract

Abstract

The article presents a new diagnostic method of a motor starter based on the analysis of the starter’s power and the Hall effect. Using the Matlab Simulink program the wear and tear impact of the starter sleeves on power characteristics was simulated. For the analysis of the flux propagation and the distribution of magnetic induction for selected states of the wear and tear of the sleeve the QuickField program was used. Within the experimental tests, registration of the distribution of magnetic induction was conducted by the Hall sensor placed in the link slot. The model and the tests made it possible to develop diagnostic patterns within the OBD diagnostics.

Keywords

  • starter faults
  • reliability
  • QuickField
Open Access

Basics of the Corrective - Resonant Spectral Method of Gas Flow Identification from the Damaged Pipeline and its Experimental Verification

Published Online: 28 Jul 2018
Page range: 159 - 175

Abstract

Abstract

An important problem in the operation of gas pipelines is the identification of accidental gas leakage from the damaged pipeline. It is the hardest when the leakage is small. A disadvantage of prior methods is that with their use is only possible to identify and locate significant outflow with only a low accuracy. In proposed method of identifying the gas flow will be used a new signal from the corrective element “r” attached to the tested pipeline and calculated from it and mass flow rate signals auto and cross power spectral density Sxx, Syy, Srr, Sxy, Sxr, Syr. Using the power spectral density signals allows for transition from the signal diagnostic to the parameter diagnostic which is more effective. Assumptions methods will be verified at the experimental station.

Keywords

  • diagnostics
  • corrective element
  • weak interactions
  • amplitude gain
  • phase shift
Open Access

Identification Method of Content Changes of Information Contained Inside Files

Published Online: 28 Jul 2018
Page range: 117 - 190

Abstract

Abstract

The thesis shows the use of message hash function for integrity attribute change identification in sensitive information asset. Changes introduced to file content may suggest confidentiality attribute violation. It has been verified in what way random changes introduced into file content affect function. The minor number of bytes changed in comparison to file size that was assumed, derives from potential benefits for the attacker. Large number of changes in the file may suggest the situation of encrypting it. Such an action leads to accessibility attribute violation

Keywords

  • hash function
  • sensitive information asset
Open Access

Verification Postdiagnostic Decisions Tested of Artillery Fuses

Published Online: 28 Jul 2018
Page range: 191 - 222

Abstract

Abstract

A statistical analysis of multiyear laboratory test results and dynamic tests chosen type of artillery fuses is presented in this article as the aim to testify influence of natural ageing process on quality indicators during long - time exploitation. The influence of exploitation time on taking shooting test decisions relating the quality of lots after conducted laboratory tests and on different inconsistencies classes which stepped out during these tests were analysed. The analysis of exploitation time influence on diagnostic decisions taking after conducted shooting tests and on occurrence inconsistences in the establish classes were also presented. The conducted statistical analysis suggested assumption, that there is possibility of changing of estimate module in the test’s methodology applied until now. The modification of this estimate module will not influence negatively on the quality of further diagnostic tests conducted, and it will not influence negatively on correct evaluation of prediction process tested elements of ammunition which the artillery fuses are. Performed the statistical analysis can be essentially relevant to modify tests methodology of the artillery fuses.

Keywords

  • exploitation
  • inconsistences
  • testing cycle
  • decision
  • test
  • properties
Open Access

Assessment of the Fuel Thermal Degradation Process on the Basis of the Deposit Content Analysis

Published Online: 28 Jul 2018
Page range: 223 - 234

Abstract

Abstract

The publication subject is the issue related to the assessment of phenomena occurring during the jet fuel thermal degradation process. The research in this article was carried out on a specialised laboratory station, according to the author’s own methodology. The assessment of the fuel degradation process was conducted on the basis of an analysis of the content of deposits collected on filters with a diameter of 0.8 µm and 3.0 µm. The filters were additionally analysed under a microscope. The results indicate that a degree and intensity of the fuel thermal degradation process are affected by the technology of the tested fuel and the test temperature. The article was prepared on the basis of the results obtained within the framework of the research project No. 2011/01/D/ST8/06567 funded by National Science Centre.

Keywords

  • thermal stability
  • jet fuel
  • turbine aircraft engines
  • deposits
Open Access

Return to Vocational Education

Published Online: 28 Jul 2018
Page range: 235 - 255

Abstract

Abstract

The article presents the description of the current education and vocational training systems in Poland and the world with special emphasis on technical professions. It draws attention to the events and decisions, which led to a decreased level of education, lower quality of graduates and problems, the youth graduating from secondary and high schools have with finding a job. The studies of the authors on the effectiveness of vocational training systems lead to the presentation of an innovative proposal of deriving operational goals of education from professional tasks and developing a modular design of curricula. Such an approach towards the construction of vocational training programs is based on the model of a modularized occupation MES (Modules of Employable Skills). The described concept is supported by: high efficiency, flexibility and economic issues.

Keywords

  • Vocational education
  • innovative educational system
  • operational goals of education
  • modular curriculum
Open Access

Military Pilot Training

Published Online: 28 Jul 2018
Page range: 257 - 266

Abstract

Abstract

The article presents the description of the current systems of training military aircraft pilots. Particular attention has been paid to the trends of change aimed at reducing the cost of purchasing school aircraft and the burden on the entire training and aircraft operation system. Over the past 3 years, the annual Pilot Training Conference in London has dominated the issue of increasing the effectiveness of training pilots of combat aircraft and unmanned aerial vehicle operators. The results of training experiments were presented on this conference, which presented the abandonment of intermediate airplanes training process of military pilots. The results of different researches allowed to state, that on a well-designed school airplane, such as the Pilatus PC-21, one can train both basic and advanced trainings and then train pilots directly to the combat aircraft. Of course, all this training process should be intensively supported by the modern mission simulator of the 5th generation. This allows the thesis to be a future, innovative training system that significantly reduces the training costs of a combat aircraft pilot without affecting the quality of the training.

Keywords

  • pilot training
  • training effectiveness
  • cost reduction
  • mission simulators
Open Access

Wankel Engines for Unmanned Aerial Vehicles

Published Online: 28 Jul 2018
Page range: 267 - 274

Abstract

Abstract

The article presents the possibility of using a rotary piston engine, called the Wankel engine, to drive for unmanned aerial vehicles. It describes the principle of engine operation, its advantages and disadvantages. The article specifies the categories of drones to which these engines are dedicated. The author presents the modular Wankel engine of 5-120 hp for unmanned aerial vehicles, manufactured by Advanced Innovative Engeeniering.

Keywords

  • Wankel engine
  • unmanned aircraft
  • aircraft engine
Open Access

Helmet-Mounted Attitude Control Algorithms of the Opto-Electronic Surveillance System for Aircraft Search and Rescue Actions

Published Online: 28 Jul 2018
Page range: 275 - 292

Abstract

Abstract

This article presents selected results of work concerning the errors modeling of helmet-mounted cueing systems used for guided weapon and opto-electronic surveillance systems target homing (for realizing aircraft search and rescue actions). There were described algorithms of helmet angular position determination on the basis of inertial and magnetic methods, moreover, the possibilities of their modification. On this background there were presented the authorial method of pilot’s helmet angular position determination dedicated for helmet-mounted cueing systems for fighter helicopters. The method is based on the pilot’s helmet and aircraft body linear accelerations measurements, which then are used for the current quaternion evaluation to describe the helmet position relatively to the aircraft. Simulation models were tested in Matlab-Simulink and Borland C++ computational packages for various pilot’s helmet space orientation using specialized rotation test stands.

Keywords

  • helmet-mounted cueing systems
  • work algorithms
  • research methods
Open Access

Dynamic Properties Modeling of the Thermoelectric Fire Sensors in the Aircraft Fire Suppression System

Published Online: 28 Jul 2018
Page range: 293 - 307

Abstract

Abstract

The paper presents selected results of work at the Air Force Institute of Technology (AFIT) in the concerning modeling the dynamic properties of fire detectors used in aviation fire protection systems. In order to determine the conditions of false fire signals, the simulation models of thermoelectric fire detectors have been developed. Simulation models were tested in Matlab-Simulink computational packages for various methods of heating and cooling the sensors (among others, changes in ambient air temperature of the sensor, caused by the EWU exhaust gas diffusers were simulated – these diffusers are used to distribute flue gases from helicopter engines).

Keywords

  • aircraft fire suppression systems
  • research methods
Open Access

Mobile Composite Airfield Element of Security and Reliability in Air Transport

Published Online: 28 Jul 2018
Page range: 309 - 320

Abstract

Abstract

The problem of safety of the flight operations will be valid as long as there will be aviation, both civil and military. Ensuring the safety was, is and will be one the most important issues in the functioning and development of aviation.

The safety of flight operations affect the implementation of all the elements involved in this process, which can be summarized in three groups, namely: man, the aircraft and the environment, including airfield pavements. Airfield pavements are elements that can be intentionally destroyed by military action as well as a result of random unexpected situation (failure, catastrophe, natural disaster). The reconstruction of airfield pavements in crisis situations and in military operations should enable to restore the operational availability of destroyed elements in the shortest possible time.

Keywords

  • security
  • reliability
  • air transport
  • mobile composite covering
Open Access

Welds’ Quality of Aluminium Alloy Components of Military Aircraft Executed by Arc Welding Method

Published Online: 28 Jul 2018
Page range: 321 - 332

Abstract

Abstract

The paper presents the problems arising in the process of repairs of aircraft (AC) components made of aluminium alloys during arc welding with the TIG (tungsten inert gas) method. The paper provides information on the rules applicable in the welding process qualification. The procedure algorithm when qualifying the welding process was presented in accordance with PN-EN ISO 15614-2. The main causes and factors affecting the formation of defects and welding imperfections were described and classified. The principles of preparing the components for welding and selection of a binder were discussed. The issue of effect of the welding parameters on the formation of defects and welding imperfections in relation to PN-L-01426 standard was raised. The application of computed tomography in assessment of the welded joints was described and tomograms from tests of butt welds of aluminium alloys made of the AW 5754 grade aluminium alloy were presented. On the example of the tomograms, the welding imperfections and defects formed in the tested joints were discussed. The usefulness of computed tomography in assessment of the welds’ quality was shown.

Keywords

  • welding
  • aluminium alloys
  • defects
  • tests
  • reliability
Open Access

Thermal Resistance of Airfield Concrete Pavements and Consequences for the Maintenance Thereof

Published Online: 28 Jul 2018
Page range: 333 - 346

Abstract

Abstract

The project presents the approximate method to specify temperature changes which may cause and intensify the pavement slabs destruction. Criteria of thermal concrete resistance in case of pavement structure were specified. Defining the acoustics performance, the degree of changes occurred in surface layer and changes in basic mechanical parameters as criteria of pavement thermal condition were suggested. The process of cement concrete damage in case of pavement structure, as a result of combined temperature changes and vehicle traffic was also discussed. Criteria of fragile damage of concrete slab and allowable stress of concrete layer in case of pavement structure were described. Types of heat flow within the pavement were discussed and associated with the occurred damages. The destruction process of concrete pavements under the influence of temperature was presented. The publication contains the proposal of reducing the effects of the aforementioned factors on the range of the occurred stress. The analysis does not include the complex issue of thermal stress within concrete pavement, caused by hot exhaust gas stream.

Keywords

  • airfield concrete pavements
  • thermal resistance
  • cement concrete
  • airfield pavements
Open Access

Method of Formulating the Required Number of Vehicles for Delivery Aircrafts in Aviation Fuel

Published Online: 28 Jul 2018
Page range: 347 - 358

Abstract

Abstract

An important part of the air base logistic system is the supply sub-system. In military operations the main delivery can be focused on munitions and aviation fuel. Effective management of the supply stream and the reliability of vehicles in the air base logistic system affect the quality of operations, which can be measured by on time provisions, economic factors and the reliability of vehicles. At present the number of tankers in the air base logistic system is based on experiences.

Keywords

  • vehicles
  • delivery
  • optimization
Open Access

The Application of Probability Elements in Optimizing Supply of Spare Parts and Components in Aviation

Published Online: 28 Jul 2018
Page range: 359 - 388

Abstract

Abstract

The paper undertakes the problem of managing exploitation support of aviation equipment in terms of spare parts and subassemblies taking into account variable conditions, resulting from different intensity of aircraft and helicopter operation. It covers the practical aspects of planning stocks of material resources in connection with the applicable operating systems and failure of aircraft at the airbase level. By using statistical elements and probabilistic models it indicates the possibility of increasing the availability of parts and aircraft components, which in the long run will make a positive impact on the level of equipment technical efficiency. The article points to the need to minimize the expenditure involved and to avoid redundant, useless aircraft spare parts and components. Therefore, it is aimed at increasing the efficiency of material management, improving safety and developing exploitation systems in terms of technical reliability.

Keywords

  • Equipment exploitation
  • spare parts
  • optimization
  • probabilistic methods
  • stocks
Open Access

The Concept of Monitoring Blades of Rotor Machines with the Identification of their Vibration Frequency

Published Online: 28 Jul 2018
Page range: 389 - 412

Abstract

Abstract

The paper presents the basis of a new method for monitoring the technical condition of rotating blades during their operation. Utilizing the measurement of blade tip instantaneous speed under subsequent sensors, enables direct determination of the blade vibration frequency. The method utilizes a diagnostic model in the form of amplitude amplification W2ij and phase shift φij of a diagnostic signal y(t) resulting from the operation of the blade and the signal from its environment, when the blade tip passes under a cascade of blade tip instantaneous speed sensors. The adopted diagnostic model, indirectly takes into account the current surrounding of a blade without the need to measure it [12, 14]. Evaluation of the blade technical condition in real time and static analysis shall be performed on the basis of the vibration process parameter analysis. The suggested method may play an important role in the diagnostics of rotor machine blades during their operation.

Keywords

  • blade diagnostics
  • correlation function
  • spectral power density function
  • amplitude strengthening
  • phase sift
  • instantaneous amplitude of vibration velocity
  • blade vibration displacement amplitude
22 Articles
Open Access

Controlling the Operation Process of the Unmanned Aerial System

Published Online: 28 Jul 2018
Page range: 5 - 36

Abstract

Abstract

The development of unmanned aerial systems (UAS) encountered the problem of controlling the process of technical operation. The literature that is available to the authors lacks credible information concerning the principles of specifying the strategy and control of the process of UAS operation. Hence, it is necessary to recognise and interpret the basic UAS operation features. The purpose of the publication is to present the properties of the UAS as an object of operation and the mutual relation of the technical operation process with the UAS’ technical condition alteration process. We present the results of analyses in terms of functionality and the UAS’ utility potential. The publication pays special attention to the properties of the UAS as an object of operation. The paper includes the analysis of the UAS operation principles and the specification of the advantage and disadvantage of those principles, i.e. using a non-repairable UAS until damaged, using a repairable UAS until damaged, periodical technical servicing, continuous diagnostic operation. The proposals for the control models in the UAS operation system have also been included.

Keywords

  • unmanned aerial system
  • technical operation
  • servicing
  • technical condition
  • damage
Open Access

Applying Pareto Frontier to Determine Control Strategy of Technical Objects Operation Process

Published Online: 28 Jul 2018
Page range: 37 - 57

Abstract

Abstract

The paper deals with the multi-criteria model of technical objects operation process control in which the choice of control strategy is made with the use of nondeterministic methods. The decisive model was created with the use of decisive theories of semi-Markov processes. The choice of the optimum (quasi-optimum) solution is made with the use of simulated annealing algorithm. As a result of numeric calculations for used criteria functions (availability, risk), a set of quasi-optimum solutions in the form of Pareto frontier is obtained.

Keywords

  • control strategy
  • Pareto front
  • availability
  • risk
Open Access

Method of Availability Control in the Transport System using Simulation Model of Operation and Maintenance Process

Published Online: 28 Jul 2018
Page range: 59 - 79

Abstract

Abstract

The paper presents the description of algorithm for calculation characteristics of simulation model for the operation and maintenance process of transport means. The model presented in the paper constitutes an integral element of the developed complex method of quality control in elaborate technical object performance systems. In the example presented in the paper, the evaluation criteria consist of the availability of technical object as well as unit profit generated in the states of the modeled operation and maintenance process. On the basis of the results of research carried out at an existing operation and maintenance system, entry data for the model were obtained and simulation experiments were carried out.

Keywords

  • simulation model
  • availability
  • unit profit
  • transport means
Open Access

Method of Determining the Required Number of Technical Backup Area Posts

Published Online: 28 Jul 2018
Page range: 81 - 96

Abstract

Abstract

In complex operation systems, the processes of rendering technical objects roadworthy are carried out at specifically designed technical backup area posts. The article presents the method of defining the number of technical backup area posts required for appropriate functioning of assigned service and repair task. Then typical calculation results are presented in charts prepared on the basis of data obtained from tests at existing transport means operation system. The presented method makes it possible to analogically determine the minimum required number of posts for carrying out the assigned service and repair task for both a subsystem comprised of a group of units a given group of posts or an individual post in traffic maintenance and intervention subsystems.

Keywords

  • service and repair
  • number of posts
  • availability
Open Access

Implementation of Modular Trucks into Road Transport

Published Online: 28 Jul 2018
Page range: 97 - 118

Abstract

Abstract

In this article, an analysis of modular truck application in the road transport in Poland has been made. Terminology has been unified. Classification and law regulations applicable in different European countries and all over the world have been discussed. An analysis of existing solutions has been made and an optimal variant for road freight transport, including the condition and parameters of the road infrastructure in Poland, has been proposed. The study presents initial conceptual assumptions of this project as well as advisability of using these modular trucks, on the basis of a selected research object – the analyzed transport company. On this example, an analysis of costs and potential profits to be generated from transport services performed using the proposed modular trucks and with reference to costs borne by the investigated company with the use of currently operated transport means, has been made.

Keywords

  • road transport
  • modular trucks
  • efficiency
  • costs of operation
Open Access

Numerical Simulation of the Process of a Technical Object State Changes

Published Online: 28 Jul 2018
Page range: 119 - 140

Abstract

Abstract

The article presents a construction method and an example of a model of a technical object operation process as well as the main stochastic assumption which is a mathematical model of an object state changes. The model of the operation process was built using an analysis of the state space and operation-related events of the analyzed technical objects. An example of numerical simulation of the technical object state change process as a tool to be used to support the analysis of the considered process. Numerical simulation of the stochastic process being a model of a technical object state change process makes it possible to determine the process characteristics impossible to determine in an analytical way.

Keywords

  • numerical simulation
  • operation process
  • stochastic process
  • object state
  • operation-related state
Open Access

Simulation of Automotive Starter Faults

Published Online: 28 Jul 2018
Page range: 141 - 158

Abstract

Abstract

The article presents a new diagnostic method of a motor starter based on the analysis of the starter’s power and the Hall effect. Using the Matlab Simulink program the wear and tear impact of the starter sleeves on power characteristics was simulated. For the analysis of the flux propagation and the distribution of magnetic induction for selected states of the wear and tear of the sleeve the QuickField program was used. Within the experimental tests, registration of the distribution of magnetic induction was conducted by the Hall sensor placed in the link slot. The model and the tests made it possible to develop diagnostic patterns within the OBD diagnostics.

Keywords

  • starter faults
  • reliability
  • QuickField
Open Access

Basics of the Corrective - Resonant Spectral Method of Gas Flow Identification from the Damaged Pipeline and its Experimental Verification

Published Online: 28 Jul 2018
Page range: 159 - 175

Abstract

Abstract

An important problem in the operation of gas pipelines is the identification of accidental gas leakage from the damaged pipeline. It is the hardest when the leakage is small. A disadvantage of prior methods is that with their use is only possible to identify and locate significant outflow with only a low accuracy. In proposed method of identifying the gas flow will be used a new signal from the corrective element “r” attached to the tested pipeline and calculated from it and mass flow rate signals auto and cross power spectral density Sxx, Syy, Srr, Sxy, Sxr, Syr. Using the power spectral density signals allows for transition from the signal diagnostic to the parameter diagnostic which is more effective. Assumptions methods will be verified at the experimental station.

Keywords

  • diagnostics
  • corrective element
  • weak interactions
  • amplitude gain
  • phase shift
Open Access

Identification Method of Content Changes of Information Contained Inside Files

Published Online: 28 Jul 2018
Page range: 117 - 190

Abstract

Abstract

The thesis shows the use of message hash function for integrity attribute change identification in sensitive information asset. Changes introduced to file content may suggest confidentiality attribute violation. It has been verified in what way random changes introduced into file content affect function. The minor number of bytes changed in comparison to file size that was assumed, derives from potential benefits for the attacker. Large number of changes in the file may suggest the situation of encrypting it. Such an action leads to accessibility attribute violation

Keywords

  • hash function
  • sensitive information asset
Open Access

Verification Postdiagnostic Decisions Tested of Artillery Fuses

Published Online: 28 Jul 2018
Page range: 191 - 222

Abstract

Abstract

A statistical analysis of multiyear laboratory test results and dynamic tests chosen type of artillery fuses is presented in this article as the aim to testify influence of natural ageing process on quality indicators during long - time exploitation. The influence of exploitation time on taking shooting test decisions relating the quality of lots after conducted laboratory tests and on different inconsistencies classes which stepped out during these tests were analysed. The analysis of exploitation time influence on diagnostic decisions taking after conducted shooting tests and on occurrence inconsistences in the establish classes were also presented. The conducted statistical analysis suggested assumption, that there is possibility of changing of estimate module in the test’s methodology applied until now. The modification of this estimate module will not influence negatively on the quality of further diagnostic tests conducted, and it will not influence negatively on correct evaluation of prediction process tested elements of ammunition which the artillery fuses are. Performed the statistical analysis can be essentially relevant to modify tests methodology of the artillery fuses.

Keywords

  • exploitation
  • inconsistences
  • testing cycle
  • decision
  • test
  • properties
Open Access

Assessment of the Fuel Thermal Degradation Process on the Basis of the Deposit Content Analysis

Published Online: 28 Jul 2018
Page range: 223 - 234

Abstract

Abstract

The publication subject is the issue related to the assessment of phenomena occurring during the jet fuel thermal degradation process. The research in this article was carried out on a specialised laboratory station, according to the author’s own methodology. The assessment of the fuel degradation process was conducted on the basis of an analysis of the content of deposits collected on filters with a diameter of 0.8 µm and 3.0 µm. The filters were additionally analysed under a microscope. The results indicate that a degree and intensity of the fuel thermal degradation process are affected by the technology of the tested fuel and the test temperature. The article was prepared on the basis of the results obtained within the framework of the research project No. 2011/01/D/ST8/06567 funded by National Science Centre.

Keywords

  • thermal stability
  • jet fuel
  • turbine aircraft engines
  • deposits
Open Access

Return to Vocational Education

Published Online: 28 Jul 2018
Page range: 235 - 255

Abstract

Abstract

The article presents the description of the current education and vocational training systems in Poland and the world with special emphasis on technical professions. It draws attention to the events and decisions, which led to a decreased level of education, lower quality of graduates and problems, the youth graduating from secondary and high schools have with finding a job. The studies of the authors on the effectiveness of vocational training systems lead to the presentation of an innovative proposal of deriving operational goals of education from professional tasks and developing a modular design of curricula. Such an approach towards the construction of vocational training programs is based on the model of a modularized occupation MES (Modules of Employable Skills). The described concept is supported by: high efficiency, flexibility and economic issues.

Keywords

  • Vocational education
  • innovative educational system
  • operational goals of education
  • modular curriculum
Open Access

Military Pilot Training

Published Online: 28 Jul 2018
Page range: 257 - 266

Abstract

Abstract

The article presents the description of the current systems of training military aircraft pilots. Particular attention has been paid to the trends of change aimed at reducing the cost of purchasing school aircraft and the burden on the entire training and aircraft operation system. Over the past 3 years, the annual Pilot Training Conference in London has dominated the issue of increasing the effectiveness of training pilots of combat aircraft and unmanned aerial vehicle operators. The results of training experiments were presented on this conference, which presented the abandonment of intermediate airplanes training process of military pilots. The results of different researches allowed to state, that on a well-designed school airplane, such as the Pilatus PC-21, one can train both basic and advanced trainings and then train pilots directly to the combat aircraft. Of course, all this training process should be intensively supported by the modern mission simulator of the 5th generation. This allows the thesis to be a future, innovative training system that significantly reduces the training costs of a combat aircraft pilot without affecting the quality of the training.

Keywords

  • pilot training
  • training effectiveness
  • cost reduction
  • mission simulators
Open Access

Wankel Engines for Unmanned Aerial Vehicles

Published Online: 28 Jul 2018
Page range: 267 - 274

Abstract

Abstract

The article presents the possibility of using a rotary piston engine, called the Wankel engine, to drive for unmanned aerial vehicles. It describes the principle of engine operation, its advantages and disadvantages. The article specifies the categories of drones to which these engines are dedicated. The author presents the modular Wankel engine of 5-120 hp for unmanned aerial vehicles, manufactured by Advanced Innovative Engeeniering.

Keywords

  • Wankel engine
  • unmanned aircraft
  • aircraft engine
Open Access

Helmet-Mounted Attitude Control Algorithms of the Opto-Electronic Surveillance System for Aircraft Search and Rescue Actions

Published Online: 28 Jul 2018
Page range: 275 - 292

Abstract

Abstract

This article presents selected results of work concerning the errors modeling of helmet-mounted cueing systems used for guided weapon and opto-electronic surveillance systems target homing (for realizing aircraft search and rescue actions). There were described algorithms of helmet angular position determination on the basis of inertial and magnetic methods, moreover, the possibilities of their modification. On this background there were presented the authorial method of pilot’s helmet angular position determination dedicated for helmet-mounted cueing systems for fighter helicopters. The method is based on the pilot’s helmet and aircraft body linear accelerations measurements, which then are used for the current quaternion evaluation to describe the helmet position relatively to the aircraft. Simulation models were tested in Matlab-Simulink and Borland C++ computational packages for various pilot’s helmet space orientation using specialized rotation test stands.

Keywords

  • helmet-mounted cueing systems
  • work algorithms
  • research methods
Open Access

Dynamic Properties Modeling of the Thermoelectric Fire Sensors in the Aircraft Fire Suppression System

Published Online: 28 Jul 2018
Page range: 293 - 307

Abstract

Abstract

The paper presents selected results of work at the Air Force Institute of Technology (AFIT) in the concerning modeling the dynamic properties of fire detectors used in aviation fire protection systems. In order to determine the conditions of false fire signals, the simulation models of thermoelectric fire detectors have been developed. Simulation models were tested in Matlab-Simulink computational packages for various methods of heating and cooling the sensors (among others, changes in ambient air temperature of the sensor, caused by the EWU exhaust gas diffusers were simulated – these diffusers are used to distribute flue gases from helicopter engines).

Keywords

  • aircraft fire suppression systems
  • research methods
Open Access

Mobile Composite Airfield Element of Security and Reliability in Air Transport

Published Online: 28 Jul 2018
Page range: 309 - 320

Abstract

Abstract

The problem of safety of the flight operations will be valid as long as there will be aviation, both civil and military. Ensuring the safety was, is and will be one the most important issues in the functioning and development of aviation.

The safety of flight operations affect the implementation of all the elements involved in this process, which can be summarized in three groups, namely: man, the aircraft and the environment, including airfield pavements. Airfield pavements are elements that can be intentionally destroyed by military action as well as a result of random unexpected situation (failure, catastrophe, natural disaster). The reconstruction of airfield pavements in crisis situations and in military operations should enable to restore the operational availability of destroyed elements in the shortest possible time.

Keywords

  • security
  • reliability
  • air transport
  • mobile composite covering
Open Access

Welds’ Quality of Aluminium Alloy Components of Military Aircraft Executed by Arc Welding Method

Published Online: 28 Jul 2018
Page range: 321 - 332

Abstract

Abstract

The paper presents the problems arising in the process of repairs of aircraft (AC) components made of aluminium alloys during arc welding with the TIG (tungsten inert gas) method. The paper provides information on the rules applicable in the welding process qualification. The procedure algorithm when qualifying the welding process was presented in accordance with PN-EN ISO 15614-2. The main causes and factors affecting the formation of defects and welding imperfections were described and classified. The principles of preparing the components for welding and selection of a binder were discussed. The issue of effect of the welding parameters on the formation of defects and welding imperfections in relation to PN-L-01426 standard was raised. The application of computed tomography in assessment of the welded joints was described and tomograms from tests of butt welds of aluminium alloys made of the AW 5754 grade aluminium alloy were presented. On the example of the tomograms, the welding imperfections and defects formed in the tested joints were discussed. The usefulness of computed tomography in assessment of the welds’ quality was shown.

Keywords

  • welding
  • aluminium alloys
  • defects
  • tests
  • reliability
Open Access

Thermal Resistance of Airfield Concrete Pavements and Consequences for the Maintenance Thereof

Published Online: 28 Jul 2018
Page range: 333 - 346

Abstract

Abstract

The project presents the approximate method to specify temperature changes which may cause and intensify the pavement slabs destruction. Criteria of thermal concrete resistance in case of pavement structure were specified. Defining the acoustics performance, the degree of changes occurred in surface layer and changes in basic mechanical parameters as criteria of pavement thermal condition were suggested. The process of cement concrete damage in case of pavement structure, as a result of combined temperature changes and vehicle traffic was also discussed. Criteria of fragile damage of concrete slab and allowable stress of concrete layer in case of pavement structure were described. Types of heat flow within the pavement were discussed and associated with the occurred damages. The destruction process of concrete pavements under the influence of temperature was presented. The publication contains the proposal of reducing the effects of the aforementioned factors on the range of the occurred stress. The analysis does not include the complex issue of thermal stress within concrete pavement, caused by hot exhaust gas stream.

Keywords

  • airfield concrete pavements
  • thermal resistance
  • cement concrete
  • airfield pavements
Open Access

Method of Formulating the Required Number of Vehicles for Delivery Aircrafts in Aviation Fuel

Published Online: 28 Jul 2018
Page range: 347 - 358

Abstract

Abstract

An important part of the air base logistic system is the supply sub-system. In military operations the main delivery can be focused on munitions and aviation fuel. Effective management of the supply stream and the reliability of vehicles in the air base logistic system affect the quality of operations, which can be measured by on time provisions, economic factors and the reliability of vehicles. At present the number of tankers in the air base logistic system is based on experiences.

Keywords

  • vehicles
  • delivery
  • optimization
Open Access

The Application of Probability Elements in Optimizing Supply of Spare Parts and Components in Aviation

Published Online: 28 Jul 2018
Page range: 359 - 388

Abstract

Abstract

The paper undertakes the problem of managing exploitation support of aviation equipment in terms of spare parts and subassemblies taking into account variable conditions, resulting from different intensity of aircraft and helicopter operation. It covers the practical aspects of planning stocks of material resources in connection with the applicable operating systems and failure of aircraft at the airbase level. By using statistical elements and probabilistic models it indicates the possibility of increasing the availability of parts and aircraft components, which in the long run will make a positive impact on the level of equipment technical efficiency. The article points to the need to minimize the expenditure involved and to avoid redundant, useless aircraft spare parts and components. Therefore, it is aimed at increasing the efficiency of material management, improving safety and developing exploitation systems in terms of technical reliability.

Keywords

  • Equipment exploitation
  • spare parts
  • optimization
  • probabilistic methods
  • stocks
Open Access

The Concept of Monitoring Blades of Rotor Machines with the Identification of their Vibration Frequency

Published Online: 28 Jul 2018
Page range: 389 - 412

Abstract

Abstract

The paper presents the basis of a new method for monitoring the technical condition of rotating blades during their operation. Utilizing the measurement of blade tip instantaneous speed under subsequent sensors, enables direct determination of the blade vibration frequency. The method utilizes a diagnostic model in the form of amplitude amplification W2ij and phase shift φij of a diagnostic signal y(t) resulting from the operation of the blade and the signal from its environment, when the blade tip passes under a cascade of blade tip instantaneous speed sensors. The adopted diagnostic model, indirectly takes into account the current surrounding of a blade without the need to measure it [12, 14]. Evaluation of the blade technical condition in real time and static analysis shall be performed on the basis of the vibration process parameter analysis. The suggested method may play an important role in the diagnostics of rotor machine blades during their operation.

Keywords

  • blade diagnostics
  • correlation function
  • spectral power density function
  • amplitude strengthening
  • phase sift
  • instantaneous amplitude of vibration velocity
  • blade vibration displacement amplitude

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