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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 42 (2017): Issue 1 (June 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

Numerical analysis of collision of the multimaterial bird model with helicopter windshield

Published Online: 19 Dec 2017
Page range: 5 - 24

Abstract

Abstract

The aim of this article is to present findings of simulation research of a stork impact with a helicopter windshield. Besides we developed a numerical model of the stork, based on biometrical data, taking into account various properties of its head, neck, torso and wings. It appears that the research findings which take into consideration the bird’s shape differ from those using a simplified bird model in the shape of a cylinder or a sphere. In order to conduct an analysis of a bird impact onto an aircraft windshield, we used the LS_DYNA software package. In the classic variant with the 3.6 kg bird model, cylinder-shaped with spherical endings, the windshield became damaged at the velocity of 200 km/h for a standard windshield (3.81 mm). For the same velocity, we conducted simulation which used the multimaterial model. It appeared that the windshield did not become damaged. Therefore, the shape of the dummy bird also affects the velocity at which the damage occurs. Too wide simplification of the dummy bird shape may lead to lowered values of the velocity.

Keywords

  • bird strikes
  • multilateral model
  • numerical simulation
Open Access

The use of a simulation model to analyze the impact of heavy transport generated by the port to the city traffic.

Published Online: 19 Dec 2017
Page range: 25 - 42

Abstract

Abstract

The article presents an analysis of the impact of transport on heavy urban traffic on Wharf Kwiatkowski using program PTV Vissim. The data for analysis were taken from the Road and Greenery in Gdynia from program PTV Visum. Attention has been focused on vehicle traffic in the afternoon the top of its intensity. Model of Kwiatkowskiego Wharf, made entirely in the PTV VISSIM, was used for microscopic simulation of traffic. With its help, it was possible to find and analyze the behavior of each autonomous vehicle and interactions on the Web. For the analysis was used as a program of traffic lights currency at these junctions. The analysis results of simulation in the PTV VISSIM are related to the movement of the two structures. The first assumes that the route will move cars and trucks, taking into account their share in the network based on the intensity of traffic during peak hours of the afternoon, the second consisted only of cars. The results presented are based on measuring the time of travel and delays on specific relationships and the average length of queues at selected inlets. The results of analysis and simulation tests were subjected to statistical analysis.

Keywords

  • traffic analysis
  • simulation model
Open Access

Road safety inspection as a tool for road safety management – the polish experience

Published Online: 19 Dec 2017
Page range: 43 - 62

Abstract

Abstract

In Poland, road inspections were implemented in June 2014 on all national roads. Previous traffic surveys mainly looked at the technical condition of roads, signs and markings; other safety issues were overlooked. The main problem of the inspections is that the qualitative assessment is subjective which affects the classification of the sources of hazard on the road. The paper presents an analysis of the variability of the qualitative assessments of road defects when they are assessed by different teams of inspectors. On this basis, guidelines were developed for the classification of risks based on the relationship between sources of road hazard and the personal and economic losses involved in road accidents. These relationships are quantified using mathematical models to simulate the effect of hazard variability on the consequences of selected road accident causes on sections of the road network.

Keywords

  • road safety inspection
  • defects criteria
  • road safety models
Open Access

Operating environment threats influence on the maritime ferry technical system safety – the numerical approach

Published Online: 19 Dec 2017
Page range: 63 - 74

Abstract

Abstract

The material given in this paper delivers the procedure for numerical approach that allows finding the main practically important safety characteristics of the complex technical systems at the variable operation conditions including operating environment threats. The obtained results are applied to the safety evaluation of the maritime ferry technical system. It is assumed that the conditional safety functions are different at various operation states and have the exponential forms. Using the procedure and the program written in Mathematica, the considered maritime ferry technical system main characteristics including: the conditional and the unconditional expected values and standard deviations of the system lifetimes, the unconditional safety function and the risk function are determined.

Keywords

  • safety
  • operating environment threat
  • maritime ferry technical system
Open Access

Influence of flooding compartments on the stability safety of the training warship

Published Online: 19 Dec 2017
Page range: 75 - 92

Abstract

Abstract

The paper presents computational stability issues with a flooded ship compartment situated on boat deck. As the main criteria for stability of the warship, calculation algorithm of metacentric height and righting levers have been defined, with a free surface effect taken into account. Based on the results of the calculations presented in tabular and graphical forms, suitable conclusions have been drawn up.

Keywords

  • ship stability
  • angle of heel
  • safety of warship
Open Access

Application of FMEA method in railway signalling projects

Published Online: 19 Dec 2017
Page range: 93 - 110

Abstract

Abstract

The article presents the FMEA method application, which is relevant in verification of design of two separated railway signalling systems. The efficiency of the method at the stage of the design was discussed. The method was identified as an important element of safety management process and as safety analysis method, which is included in the Safety Case and is applied for the sake of safety arguments and its assessment. Safety process management comprises several phases and appropriate actions, linked with each other in the way to create safety life cycle consistent with system life cycle. The safety case is a set of documents demonstrating that the product is compliant with defined safety requirements including analysis that indicates the correctness of the design and the correct reaction of the system to the failures, with appropriate and requested fail-safe reaction. It is necessary that railway signalling system should fulfil SIL4 requirement and remain safe in case of occurrence any kind of single failure of the equipment considered as possible.

Keywords

  • FMEA method
  • safety case process
  • railway command-control systems
Open Access

Dependability of the information flow process at an intermodal transhipment point

Published Online: 19 Dec 2017
Page range: 111 - 130

Abstract

Abstract

A container terminal is an inherent part of intermodal transport. Dependable operation of the system on an inland terminal affects the transport of integrated units in intermodal transport. Each logistics system is a distinguished parallel flow of cargo and information. Both of these flows are dependent on each other and have an impact on the correctness of performing tasks.

Keywords

  • dependability
  • intermodal transport
  • inland terminal
  • information
Open Access

Integrated model of port oil piping transportation system safety including operating environment threats

Published Online: 19 Dec 2017
Page range: 131 - 142

Abstract

Abstract

The paper presents an integrated general model of complex technical system, linking its multistate safety model and the model of its operation process including operating environment threats and considering variable at different operation states its safety structures and its components safety parameters. Under the assumption that the system has exponential safety function, the safety characteristics of the port oil piping transportation system are determined.

Keywords

  • safety
  • operating environment threat
  • port oil piping transportation system
Open Access

Reliability analysis of high-speed tracked vehicles in the polish army

Published Online: 19 Dec 2017
Page range: 143 - 163

Abstract

Abstract

The Polish Armed Forces use tracked vehicles that serve as a core element of the ground combat forces. These vehicles are capable of fighting in all kinds of terrain conditions, in any season of the year. Combat missions are often fought in areas where even no dirt roads are available. The present paper assesses the reliability of tracked vehicles in the context of their irregular operation, as well as service- and maintenance-related vulnerability.

Keywords

  • tracked vehicle
  • use of vehicles
  • damage
  • reliability
Open Access

Analysis of reliability power supply intrusion and hold-up systems presented in the standard PN-EN 50131-1:2009

Published Online: 19 Dec 2017
Page range: 165 - 190

Abstract

Abstract

The intrusion and hold-up system is one of the electronic security systems. The purpose of its application is to increase the level of safety for persons and property. This kind of solutions are used in all types of objects belonging to the critical infrastructure of the State. The article presents considerations for analysis reliability of intrusion and hold-up systems. Characterize them, taking into account the guidance contained in the standard “PN-EN50131-1:2009:Alarm systems-Intrusion and hold-up systems-part 1: System requirements”. Then performed an analysis of reliability that enable their comparison. In further research of this issue is planned to carry out similar analyses, but for systems of access control and video surveillance systems (also distributed structures).

Keywords

  • reliability
  • power supply
  • intrusion and hold-up systems
Open Access

Modelling of power supplies reliability in aspect of their technical and functional state

Published Online: 19 Dec 2017
Page range: 191 - 208

Abstract

Abstract

The article presents issues related to the modeling of reliability of power supply in terms of their technical and functional condition. There are designated relations allowing to determine the probability of staying the power supply in the state: full suitability, incomplete suitability and unsuitability. There is also examined the impact of time restore of the state of full suitability for the value of the probability of staying the power supply in the state of incomplete suitability.

Keywords

  • reliability
  • power supply
  • exploitation process
Open Access

ISO 55001 and difficulties of its implementation in polish enterprises

Published Online: 19 Dec 2017
Page range: 209 - 234

Abstract

Abstract

In the presented paper, authors focus on the issues related to asset management in enterprises. The aim of the article is to present the requirements and standards defined in ISO 55001. Thus, there are presented the basic definitions related to the research area. Later, there are discussed the main guidelines set out in the standard, with taking into consideration e.g. asset management system structure. Moreover, there are defined the basic procedural steps in the process of ISO 55001 standard implementation in enterprises. This gives the possibility for the analysis of ISO 55001 standard possibilities of implementation in Polish enterprises. The article concludes with a summary.

Keywords

  • maintenance
  • ISO 55001
  • risk management
Open Access

Risk assessment issues in the process of freight transport performance

Published Online: 19 Dec 2017
Page range: 235 - 253

Abstract

Abstract

In the presented paper, authors focus on the issues related to risk assessment of transport processes performance. Thus, there are presented the basic definitions related to the research area. Later, there is discussed the possibility of risk assessment performance in the freight transport, outlining an assessment approach compatible with ISO 31000 standard and ERM concept. This gives the possibility for the presentation of risk assessment of transport processes performance in the chosen road transport company. The article concludes with a summary, including directions for further research.

Keywords

  • transportation process
  • risk assessment
  • ISO 31000
Open Access

Formation of „koon” systems reliability estimated with analytical and simulation calculation methods

Published Online: 19 Dec 2017
Page range: 255 - 272

Abstract

Abstract

The methods of reliability estimation applied in order to verify the reliability level of koon systems consisting of renewable objects are presented in the paper. Application of the selected methods allows one to quickly verify the reliability level and to set the number of redundant elements in the real technical systems.

Keywords

  • reliability
  • renewable objects
  • koon systems
  • reliability estimation methods
Open Access

Reliability monitoring of broadband access networks

Published Online: 19 Dec 2017
Page range: 273 - 282

Abstract

Abstract

One of the critical issues for broadband accesss is how to test the access network infrastructure and quality of optical signal. The installation and powering up of an optical fiber access networks requires measurement techniques for verifying the link has been configured properly and that its constituent components are functioning correctly. Maintenance functions for a broadband optical access network are classified in two main categories: preventive maintenance and post-fault maintenance. The first one consists of: surveillance (to detect degradation in optical fiber components, or any other anomalous condition not preventing the signal transmission,), testing (to measure and locate any detected degradation or anomalous condition) and control (fiber identification and fiber transfer to allow the testing of the link.). In turn second one consisits of: surveillance (to detect alarms or trouble reports and activate a procedure for restoration), testing (to locate the fault and/or verify the carrier performances after the restoration) and remedy (fiber identification, fiber repair or fiber transfer to restore the link).

Keywords

  • optical transmission
  • fiber optics
  • access networks monitoring
Open Access

Skid resistance properties of airfield pavements as one of the safety assessment parameters of air operations

Published Online: 19 Dec 2017
Page range: 283 - 303

Abstract

Abstract

The article presents the method for determining the skid resistance properties by estimating quantities characterizing the conditions on the airfield functional elements’ pavements. The skid resistance properties characterise the aircraft’ tire grip to the airfield functional element’s pavements, and this is the ability to produce a friction force between the airfield functional element’s pavement and the aircraft’s wheels under mutual skid conditions. The adhesion is affected by the pavement type and its condition, as well as the presence of contamination, and atmospheric conditions in the vicinity of the airfield. Throughout the world, measures aimed at development of a model for assessing the conditions of the airfield functional elements’ pavements are undertaken. A key element of this process is the personnel identifying specific situations as well as the pilots using the information for safe manoeuvring, especially landing.

Keywords

  • airfield pavement
  • friction tester
  • skid resistance properties
Open Access

Influence of the condition of the airfield pavement structures on the operation safety of aircraft

Published Online: 19 Dec 2017
Page range: 305 - 328

Abstract

Abstract

The structure of the airfield pavement is a set of layers, whose task is to take over and transfer loads from moving aircraft to a ground subsoil in a safety manner. Airfield pavements are designed for a specific period of operation, assuming the forecasted intensity and the structure of the air traffic. The safety of air operations executed by the aircraft on airfield pavements depends primarily on the condition of their structure’s load capacity. In order to assess the load capacity of airfield pavements, the method ACN-PCN, which was introduced by the International Civil Aviation Organization ICAO and according to which the load capacity of the airfield pavement is expressed with the PCN index, is applied.

Keywords

  • load bearing capacity
  • airfield pavement
  • safety
  • air operations
  • aircraft
Open Access

Model of designating the critical damages

Published Online: 19 Dec 2017
Page range: 329 - 352

Abstract

Abstract

Managing company in the lean way presumes no breakdowns nor reserves in the whole delivery chain. However, achieving such low indicators is impossible. That is why in some production plants it is extremely important to focus on preventive actions which can limit damages. This article depicts the method of designating the critical damages in accordance with lean maintenance method. The article consists of two parts which make for an integral body. Part one depicts the characteristic of a realistic object, it also contains productions capabilities analysis of certain areas within the production structure. Part two depicts the probabilistic model of shaping maximal time loss basing on emptying and filling interoperational buffers.

Keywords

  • critical damages
  • production system
Open Access

Model of designating the critical damages

Published Online: 19 Dec 2017
Page range: 353 - 378

Abstract

Abstract

The article consists of two parts which make for an integral body. This article depicts the method of designating the critical damages in accordance with lean maintenance method. Author considered exemplary production system (serial-parallel) in which in time Δt appeared a damage on three different objects. Article depicts the mathematical model which enables determination of an indicator called “prioritized digit of the device”. In the developed model there were considered some parameters: production abilities of devices, existence of potential vicarious devices, position of damage in the production stream based on the capacity of operational buffers, time needed to remove the damages and influence of damages to the finalization of customers’ orders – CEF indicator.

Keywords

  • critical damages
  • prioritized digit of the device
Open Access

Maintenance strategy for vehicle with electronic fuel injection system

Published Online: 19 Dec 2017
Page range: 379 - 388

Abstract

Abstract

The introduction of new vehicles technology has been projected for advanced technologically places. Their use and operation, is a theme of big concern for developing countries. This work is part of the study for the creation and establishment of a maintenance strategy and policy, which will be acceptable in developing countries. The paper proposes a methodology for the identification of critical components of the electronic fuel injection system with failure mode, effects and criticality analysis tool (FMECA). With the elaboration of this work, was possible to visualize that the maintenance strategy for each component depends strongly on the availability of equipment for the diagnosis (fail detection). As future work, would be important to study the influence of others parameters that influence the maintenance and vehicle operation, as cost, environment, human aspect and vehicle operation. Another useful analyses would be, to analyses the data in a probabilistic interpretation in order to visualize influence of each component failure in the system failure.

Keywords

  • maintenance strategy
  • fuel injection system
  • developing countrie
  • FMECA
Open Access

Safety problems in vehicles with adaptive cruise control system

Published Online: 19 Dec 2017
Page range: 389 - 398

Abstract

Abstract

In today’s world automotive industries are still putting efforts towards more autonomous vehicles (AVs). The main concern of introducing the autonomous technology is safety of driver. According to a survey 90% of accidents happen due to mistake of driver. The adaptive cruise control system (ACC) is a system which combines cruise control with a collision avoidance system. The ACC system is based on laser and radar technologies. This system is capable of controlling the velocity of vehicle automatically to match the velocity of car, bus or truck in front of vehicle. If the lead vehicle gets slow down or accelerate, than ACC system automatically matches that velocity. The proposed paper is focusing on more accurate methods of detecting the preceding vehicle by using a radar and lidar sensors by considering the vehicle side slip and by controlling the distance between two vehicles. By using this approach i.e. logic for calculation of former vehicle distance and controlling the throttle valve of ACC equipped vehicle, an improvement in driving stability was achieved. The own contribution results with fuel efficient driving and with more safer and reliable driving system, but still some improvements are going on to make it more safe and reliable.

Keywords

  • Adaptive Cruise Control (ACC)
  • driver assistance system
  • sensor system
Open Access

Simulation of automotive starter faults

Published Online: 19 Dec 2017
Page range: 399 - 417

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
22 Articles
Open Access

Numerical analysis of collision of the multimaterial bird model with helicopter windshield

Published Online: 19 Dec 2017
Page range: 5 - 24

Abstract

Abstract

The aim of this article is to present findings of simulation research of a stork impact with a helicopter windshield. Besides we developed a numerical model of the stork, based on biometrical data, taking into account various properties of its head, neck, torso and wings. It appears that the research findings which take into consideration the bird’s shape differ from those using a simplified bird model in the shape of a cylinder or a sphere. In order to conduct an analysis of a bird impact onto an aircraft windshield, we used the LS_DYNA software package. In the classic variant with the 3.6 kg bird model, cylinder-shaped with spherical endings, the windshield became damaged at the velocity of 200 km/h for a standard windshield (3.81 mm). For the same velocity, we conducted simulation which used the multimaterial model. It appeared that the windshield did not become damaged. Therefore, the shape of the dummy bird also affects the velocity at which the damage occurs. Too wide simplification of the dummy bird shape may lead to lowered values of the velocity.

Keywords

  • bird strikes
  • multilateral model
  • numerical simulation
Open Access

The use of a simulation model to analyze the impact of heavy transport generated by the port to the city traffic.

Published Online: 19 Dec 2017
Page range: 25 - 42

Abstract

Abstract

The article presents an analysis of the impact of transport on heavy urban traffic on Wharf Kwiatkowski using program PTV Vissim. The data for analysis were taken from the Road and Greenery in Gdynia from program PTV Visum. Attention has been focused on vehicle traffic in the afternoon the top of its intensity. Model of Kwiatkowskiego Wharf, made entirely in the PTV VISSIM, was used for microscopic simulation of traffic. With its help, it was possible to find and analyze the behavior of each autonomous vehicle and interactions on the Web. For the analysis was used as a program of traffic lights currency at these junctions. The analysis results of simulation in the PTV VISSIM are related to the movement of the two structures. The first assumes that the route will move cars and trucks, taking into account their share in the network based on the intensity of traffic during peak hours of the afternoon, the second consisted only of cars. The results presented are based on measuring the time of travel and delays on specific relationships and the average length of queues at selected inlets. The results of analysis and simulation tests were subjected to statistical analysis.

Keywords

  • traffic analysis
  • simulation model
Open Access

Road safety inspection as a tool for road safety management – the polish experience

Published Online: 19 Dec 2017
Page range: 43 - 62

Abstract

Abstract

In Poland, road inspections were implemented in June 2014 on all national roads. Previous traffic surveys mainly looked at the technical condition of roads, signs and markings; other safety issues were overlooked. The main problem of the inspections is that the qualitative assessment is subjective which affects the classification of the sources of hazard on the road. The paper presents an analysis of the variability of the qualitative assessments of road defects when they are assessed by different teams of inspectors. On this basis, guidelines were developed for the classification of risks based on the relationship between sources of road hazard and the personal and economic losses involved in road accidents. These relationships are quantified using mathematical models to simulate the effect of hazard variability on the consequences of selected road accident causes on sections of the road network.

Keywords

  • road safety inspection
  • defects criteria
  • road safety models
Open Access

Operating environment threats influence on the maritime ferry technical system safety – the numerical approach

Published Online: 19 Dec 2017
Page range: 63 - 74

Abstract

Abstract

The material given in this paper delivers the procedure for numerical approach that allows finding the main practically important safety characteristics of the complex technical systems at the variable operation conditions including operating environment threats. The obtained results are applied to the safety evaluation of the maritime ferry technical system. It is assumed that the conditional safety functions are different at various operation states and have the exponential forms. Using the procedure and the program written in Mathematica, the considered maritime ferry technical system main characteristics including: the conditional and the unconditional expected values and standard deviations of the system lifetimes, the unconditional safety function and the risk function are determined.

Keywords

  • safety
  • operating environment threat
  • maritime ferry technical system
Open Access

Influence of flooding compartments on the stability safety of the training warship

Published Online: 19 Dec 2017
Page range: 75 - 92

Abstract

Abstract

The paper presents computational stability issues with a flooded ship compartment situated on boat deck. As the main criteria for stability of the warship, calculation algorithm of metacentric height and righting levers have been defined, with a free surface effect taken into account. Based on the results of the calculations presented in tabular and graphical forms, suitable conclusions have been drawn up.

Keywords

  • ship stability
  • angle of heel
  • safety of warship
Open Access

Application of FMEA method in railway signalling projects

Published Online: 19 Dec 2017
Page range: 93 - 110

Abstract

Abstract

The article presents the FMEA method application, which is relevant in verification of design of two separated railway signalling systems. The efficiency of the method at the stage of the design was discussed. The method was identified as an important element of safety management process and as safety analysis method, which is included in the Safety Case and is applied for the sake of safety arguments and its assessment. Safety process management comprises several phases and appropriate actions, linked with each other in the way to create safety life cycle consistent with system life cycle. The safety case is a set of documents demonstrating that the product is compliant with defined safety requirements including analysis that indicates the correctness of the design and the correct reaction of the system to the failures, with appropriate and requested fail-safe reaction. It is necessary that railway signalling system should fulfil SIL4 requirement and remain safe in case of occurrence any kind of single failure of the equipment considered as possible.

Keywords

  • FMEA method
  • safety case process
  • railway command-control systems
Open Access

Dependability of the information flow process at an intermodal transhipment point

Published Online: 19 Dec 2017
Page range: 111 - 130

Abstract

Abstract

A container terminal is an inherent part of intermodal transport. Dependable operation of the system on an inland terminal affects the transport of integrated units in intermodal transport. Each logistics system is a distinguished parallel flow of cargo and information. Both of these flows are dependent on each other and have an impact on the correctness of performing tasks.

Keywords

  • dependability
  • intermodal transport
  • inland terminal
  • information
Open Access

Integrated model of port oil piping transportation system safety including operating environment threats

Published Online: 19 Dec 2017
Page range: 131 - 142

Abstract

Abstract

The paper presents an integrated general model of complex technical system, linking its multistate safety model and the model of its operation process including operating environment threats and considering variable at different operation states its safety structures and its components safety parameters. Under the assumption that the system has exponential safety function, the safety characteristics of the port oil piping transportation system are determined.

Keywords

  • safety
  • operating environment threat
  • port oil piping transportation system
Open Access

Reliability analysis of high-speed tracked vehicles in the polish army

Published Online: 19 Dec 2017
Page range: 143 - 163

Abstract

Abstract

The Polish Armed Forces use tracked vehicles that serve as a core element of the ground combat forces. These vehicles are capable of fighting in all kinds of terrain conditions, in any season of the year. Combat missions are often fought in areas where even no dirt roads are available. The present paper assesses the reliability of tracked vehicles in the context of their irregular operation, as well as service- and maintenance-related vulnerability.

Keywords

  • tracked vehicle
  • use of vehicles
  • damage
  • reliability
Open Access

Analysis of reliability power supply intrusion and hold-up systems presented in the standard PN-EN 50131-1:2009

Published Online: 19 Dec 2017
Page range: 165 - 190

Abstract

Abstract

The intrusion and hold-up system is one of the electronic security systems. The purpose of its application is to increase the level of safety for persons and property. This kind of solutions are used in all types of objects belonging to the critical infrastructure of the State. The article presents considerations for analysis reliability of intrusion and hold-up systems. Characterize them, taking into account the guidance contained in the standard “PN-EN50131-1:2009:Alarm systems-Intrusion and hold-up systems-part 1: System requirements”. Then performed an analysis of reliability that enable their comparison. In further research of this issue is planned to carry out similar analyses, but for systems of access control and video surveillance systems (also distributed structures).

Keywords

  • reliability
  • power supply
  • intrusion and hold-up systems
Open Access

Modelling of power supplies reliability in aspect of their technical and functional state

Published Online: 19 Dec 2017
Page range: 191 - 208

Abstract

Abstract

The article presents issues related to the modeling of reliability of power supply in terms of their technical and functional condition. There are designated relations allowing to determine the probability of staying the power supply in the state: full suitability, incomplete suitability and unsuitability. There is also examined the impact of time restore of the state of full suitability for the value of the probability of staying the power supply in the state of incomplete suitability.

Keywords

  • reliability
  • power supply
  • exploitation process
Open Access

ISO 55001 and difficulties of its implementation in polish enterprises

Published Online: 19 Dec 2017
Page range: 209 - 234

Abstract

Abstract

In the presented paper, authors focus on the issues related to asset management in enterprises. The aim of the article is to present the requirements and standards defined in ISO 55001. Thus, there are presented the basic definitions related to the research area. Later, there are discussed the main guidelines set out in the standard, with taking into consideration e.g. asset management system structure. Moreover, there are defined the basic procedural steps in the process of ISO 55001 standard implementation in enterprises. This gives the possibility for the analysis of ISO 55001 standard possibilities of implementation in Polish enterprises. The article concludes with a summary.

Keywords

  • maintenance
  • ISO 55001
  • risk management
Open Access

Risk assessment issues in the process of freight transport performance

Published Online: 19 Dec 2017
Page range: 235 - 253

Abstract

Abstract

In the presented paper, authors focus on the issues related to risk assessment of transport processes performance. Thus, there are presented the basic definitions related to the research area. Later, there is discussed the possibility of risk assessment performance in the freight transport, outlining an assessment approach compatible with ISO 31000 standard and ERM concept. This gives the possibility for the presentation of risk assessment of transport processes performance in the chosen road transport company. The article concludes with a summary, including directions for further research.

Keywords

  • transportation process
  • risk assessment
  • ISO 31000
Open Access

Formation of „koon” systems reliability estimated with analytical and simulation calculation methods

Published Online: 19 Dec 2017
Page range: 255 - 272

Abstract

Abstract

The methods of reliability estimation applied in order to verify the reliability level of koon systems consisting of renewable objects are presented in the paper. Application of the selected methods allows one to quickly verify the reliability level and to set the number of redundant elements in the real technical systems.

Keywords

  • reliability
  • renewable objects
  • koon systems
  • reliability estimation methods
Open Access

Reliability monitoring of broadband access networks

Published Online: 19 Dec 2017
Page range: 273 - 282

Abstract

Abstract

One of the critical issues for broadband accesss is how to test the access network infrastructure and quality of optical signal. The installation and powering up of an optical fiber access networks requires measurement techniques for verifying the link has been configured properly and that its constituent components are functioning correctly. Maintenance functions for a broadband optical access network are classified in two main categories: preventive maintenance and post-fault maintenance. The first one consists of: surveillance (to detect degradation in optical fiber components, or any other anomalous condition not preventing the signal transmission,), testing (to measure and locate any detected degradation or anomalous condition) and control (fiber identification and fiber transfer to allow the testing of the link.). In turn second one consisits of: surveillance (to detect alarms or trouble reports and activate a procedure for restoration), testing (to locate the fault and/or verify the carrier performances after the restoration) and remedy (fiber identification, fiber repair or fiber transfer to restore the link).

Keywords

  • optical transmission
  • fiber optics
  • access networks monitoring
Open Access

Skid resistance properties of airfield pavements as one of the safety assessment parameters of air operations

Published Online: 19 Dec 2017
Page range: 283 - 303

Abstract

Abstract

The article presents the method for determining the skid resistance properties by estimating quantities characterizing the conditions on the airfield functional elements’ pavements. The skid resistance properties characterise the aircraft’ tire grip to the airfield functional element’s pavements, and this is the ability to produce a friction force between the airfield functional element’s pavement and the aircraft’s wheels under mutual skid conditions. The adhesion is affected by the pavement type and its condition, as well as the presence of contamination, and atmospheric conditions in the vicinity of the airfield. Throughout the world, measures aimed at development of a model for assessing the conditions of the airfield functional elements’ pavements are undertaken. A key element of this process is the personnel identifying specific situations as well as the pilots using the information for safe manoeuvring, especially landing.

Keywords

  • airfield pavement
  • friction tester
  • skid resistance properties
Open Access

Influence of the condition of the airfield pavement structures on the operation safety of aircraft

Published Online: 19 Dec 2017
Page range: 305 - 328

Abstract

Abstract

The structure of the airfield pavement is a set of layers, whose task is to take over and transfer loads from moving aircraft to a ground subsoil in a safety manner. Airfield pavements are designed for a specific period of operation, assuming the forecasted intensity and the structure of the air traffic. The safety of air operations executed by the aircraft on airfield pavements depends primarily on the condition of their structure’s load capacity. In order to assess the load capacity of airfield pavements, the method ACN-PCN, which was introduced by the International Civil Aviation Organization ICAO and according to which the load capacity of the airfield pavement is expressed with the PCN index, is applied.

Keywords

  • load bearing capacity
  • airfield pavement
  • safety
  • air operations
  • aircraft
Open Access

Model of designating the critical damages

Published Online: 19 Dec 2017
Page range: 329 - 352

Abstract

Abstract

Managing company in the lean way presumes no breakdowns nor reserves in the whole delivery chain. However, achieving such low indicators is impossible. That is why in some production plants it is extremely important to focus on preventive actions which can limit damages. This article depicts the method of designating the critical damages in accordance with lean maintenance method. The article consists of two parts which make for an integral body. Part one depicts the characteristic of a realistic object, it also contains productions capabilities analysis of certain areas within the production structure. Part two depicts the probabilistic model of shaping maximal time loss basing on emptying and filling interoperational buffers.

Keywords

  • critical damages
  • production system
Open Access

Model of designating the critical damages

Published Online: 19 Dec 2017
Page range: 353 - 378

Abstract

Abstract

The article consists of two parts which make for an integral body. This article depicts the method of designating the critical damages in accordance with lean maintenance method. Author considered exemplary production system (serial-parallel) in which in time Δt appeared a damage on three different objects. Article depicts the mathematical model which enables determination of an indicator called “prioritized digit of the device”. In the developed model there were considered some parameters: production abilities of devices, existence of potential vicarious devices, position of damage in the production stream based on the capacity of operational buffers, time needed to remove the damages and influence of damages to the finalization of customers’ orders – CEF indicator.

Keywords

  • critical damages
  • prioritized digit of the device
Open Access

Maintenance strategy for vehicle with electronic fuel injection system

Published Online: 19 Dec 2017
Page range: 379 - 388

Abstract

Abstract

The introduction of new vehicles technology has been projected for advanced technologically places. Their use and operation, is a theme of big concern for developing countries. This work is part of the study for the creation and establishment of a maintenance strategy and policy, which will be acceptable in developing countries. The paper proposes a methodology for the identification of critical components of the electronic fuel injection system with failure mode, effects and criticality analysis tool (FMECA). With the elaboration of this work, was possible to visualize that the maintenance strategy for each component depends strongly on the availability of equipment for the diagnosis (fail detection). As future work, would be important to study the influence of others parameters that influence the maintenance and vehicle operation, as cost, environment, human aspect and vehicle operation. Another useful analyses would be, to analyses the data in a probabilistic interpretation in order to visualize influence of each component failure in the system failure.

Keywords

  • maintenance strategy
  • fuel injection system
  • developing countrie
  • FMECA
Open Access

Safety problems in vehicles with adaptive cruise control system

Published Online: 19 Dec 2017
Page range: 389 - 398

Abstract

Abstract

In today’s world automotive industries are still putting efforts towards more autonomous vehicles (AVs). The main concern of introducing the autonomous technology is safety of driver. According to a survey 90% of accidents happen due to mistake of driver. The adaptive cruise control system (ACC) is a system which combines cruise control with a collision avoidance system. The ACC system is based on laser and radar technologies. This system is capable of controlling the velocity of vehicle automatically to match the velocity of car, bus or truck in front of vehicle. If the lead vehicle gets slow down or accelerate, than ACC system automatically matches that velocity. The proposed paper is focusing on more accurate methods of detecting the preceding vehicle by using a radar and lidar sensors by considering the vehicle side slip and by controlling the distance between two vehicles. By using this approach i.e. logic for calculation of former vehicle distance and controlling the throttle valve of ACC equipped vehicle, an improvement in driving stability was achieved. The own contribution results with fuel efficient driving and with more safer and reliable driving system, but still some improvements are going on to make it more safe and reliable.

Keywords

  • Adaptive Cruise Control (ACC)
  • driver assistance system
  • sensor system
Open Access

Simulation of automotive starter faults

Published Online: 19 Dec 2017
Page range: 399 - 417

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

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