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Volume 49 (2019): Issue 4 (December 2019)

Volume 49 (2019): Issue 3 (October 2019)

Volume 49 (2019): Issue 2 (June 2019)

Volume 49 (2019): Issue 1 (March 2019)

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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 49 (2019): Issue 2 (June 2019)

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

Search

24 Articles
Open Access

A Simulation Model for Regenerated Objects with Multiparameter Evaluation of Technical Condition Reliability Estimation

Published Online: 21 Aug 2019
Page range: 7 - 30

Abstract

Abstract

The paper presents the developed simulation model allowing one to estimate the reliability of objects whose technical condition is described by a set of geometrical features. Their values change during operation because of the wearing processes of the part under consideration. The operational availability (or unavailability) of a technical object is determined by the evaluation conducted using a set of criteria referring to its analysed features. In addition, the proposed model enables one to take into account the regeneration of such objects.

Keywords

  • reliability
  • wear
  • computer simulation
  • renewal
Open Access

The Use of Fuzzy Logic Elements for the Risk Analysis in Aviation

Published Online: 21 Aug 2019
Page range: 31 - 53

Abstract

Abstract

The paper presents the possibility of using fuzzy logic in aviation provided in an example of estimating the risk of a glider pilot. The results of expert questionnaires were used to define the input data concerning categories of loss and the probability of undesirable events occurrence. A model of inference and fuzzy sets concerning input and output data were defined. The risk analysis was performed in accordance with the standard fuzzy regulator scheme. Moreover, the results obtained were verified with the use of Risk Matrix and Risk Score methods.

Keywords

  • fuzzy logic
  • risk analysis
  • risk in aviation
Open Access

Water Loss Analysis as an Element of Operation Management of Water Supply System

Published Online: 21 Aug 2019
Page range: 55 - 77

Abstract

Abstract

The aim of the study was an cause and effect analysis of water losses in the collective water supply system of the city located in south-eastern Poland. The exploitation data provided by the water supply company from 2012 - 2016 was used for the analysis. The study uses the recommendations of the IWA (International Water Association) for the water balance making and determination of water loss indicators. The values of water loss indicators were compared to international standards and the technical condition of the network was determined. In addition, failure rate analysis of the water supply network was performed based on the failure rate index λ. Based on the performed analysis, it was found that the water supply company should consider renovation or replacement of the main network pipelines to increase the safety level of water supply, reduce the amount of water losses and the company exploitation costs.

Keywords

  • collective water supply system
  • failure rate
  • water losses
Open Access

The Concept of a Pneumatic Parachute Rescue System for Vertical Take-Off and Landing UAVs

Published Online: 21 Aug 2019
Page range: 79 - 100

Abstract

Abstract

This publication addresses the proposed structural solution for a system, of which the conceptual essence involves a rescue parachute being ejected from an accumulator using compressed carbon dioxide. The suggested rescue system is intended for unmanned multicopter aircraft. The article presents a developed digital solid model and the results of its simulation tests. The paper also contains results of basic calculations of the pneumatic supply system energy balance and the power balance of the electric control system. It also presents the results of first in-flight tests with a simulated emergency situation and the use of a technology demonstrator in operating conditions. Simulational and experimental methods were chosen to solve the research problem.

Keywords

  • parachute
  • pneumatics
  • multicopter
  • UAV
Open Access

The Aspect of Power Supply in Exploitation of Transport Telematics Systems

Published Online: 21 Aug 2019
Page range: 101 - 119

Abstract

Abstract

Transport telematics systems operate under various operational conditions. As elements, which are responsible, among others, for the transport process safety, they should maintain their usability. One of the key problems is to ensure the power supply continuity in the transport telematics systems. In order to provide it, relevant power supply systems are used. The state of unfitness of power supply constitutes a failure in the system operation, the result of which can be downtime in operation of the entire transport telematics system or its part. The article carried out a reliability and operation analysis of the power supply system, which consists of three independent energy sources. The relationships, which allow to specify the probabilities of the system’s staying in the distinguished states, were determined.

Keywords

  • transport telematics systems
  • power supply
  • reliability
Open Access

Issue of Assessment of the Strong Electromagnetic Pulses Impact on the Functioning of Selected Electronic Devices

Published Online: 21 Aug 2019
Page range: 121 - 138

Abstract

Abstract

By analyzing the exploitation process of selected electronic devices (including those used in communication and radiolocation systems), it can be concluded that they operate in heterogeneous, often extreme conditions. Their operate in a full ability state depends not only on the reliability of the subsystems that create them, but also on the effective management of their exploitation, including vulnerability and resistance to the impact of strong electromagnetic pulses. The article proposes specific criteria containing indicators that enable the assessment of the strong electromagnetic pulses impact on the functioning of selected electronic devices.

Keywords

  • high power microwave pulses
  • impact
  • reliability
Open Access

Diversification of Aviation Safety Management on the Basis of Differences Between GA and CAT

Published Online: 21 Aug 2019
Page range: 139 - 160

Abstract

Abstract

Due to the binding regulations, safety management processes in Poland, are carried out equally, regardless of the type of aviation. The article aims to present a proposal for the separation of Commercial Air Transport (CAT) and General Aviation (GA) in these processes to provide a more accurate assessment of the Polish aviation safety state. The key issue leading to further considerations is the comparison of the number of undesired events and their types in GA and CAT. Subsequently, an in-depth analysis of the State Safety Programm is presented, allowing for more detailed conclusions. The analysis presented in the paper indicates that it would be reasonable to separate particular types of aviation in the safety management processes. It was pointed out that the differences between GA and CAT are so significant that treating them together can lead to false and wrong conclusions.

Keywords

  • safety
  • aviation
  • safety indicators
Open Access

Technical Aspect Concerning Vessels Halt Safety Upon Terrorist Hazard

Published Online: 21 Aug 2019
Page range: 161 - 182

Abstract

Abstract

The article presented and analysed the reliability of water barriers as one of the methods of securing naval technical facilities against the terrorist attacks (motorboats with explosive materials) from the sea. Water tests of FOXX barriers were described as a means of protection against such a threat. The reliability of the barrier was modelled and simulated with the use of Finite Element Method (FEM).

Keywords

  • FEM
  • safety barriers
  • water barriers
Open Access

Analysis of a Possibility of Using Fuzzy Logic to Assess the Reliability of Aircraft On-Board Systems

Published Online: 21 Aug 2019
Page range: 183 - 198

Abstract

Abstract

The paper attempts to present the current state of knowledge in the use of fuzzy logic in order to assess the reliability of technical objects over the past two decades. In world literature, one can recall three main trends related to the use of fuzzy logic in the reliability estimation. The first one deals mainly with an analysis and assessment of the risk of failure. In the second mainstream, the researchers try to analyse the human factor, which also influences system malfunction. The third group of reliability studies the possibility of using fuzzy logic for proper service planning and thus preventing damage. In each of the three mentioned trends, fuzzy logic complements the classic methods of estimating and predicting reliability.

Keywords

  • reliability
  • fuzzy logic
  • aircraft on-board systems
Open Access

The Problem of Reliability Allocation in the Subassemblies of Rail Vehicles

Published Online: 21 Aug 2019
Page range: 199 - 218

Abstract

Abstract

The following paper concerns an application of reliability allocation as a method for achieving the desired level of reliability for a selected subassembly of a type 6Dg diesel locomotive. On the basis of real operational data for the investigated vehicle, a decision model was developed to solve the allocation problem. It was demonstrated that the locomotive’s reliability may be improved by replacing the individual components in the braking and pneumatic system with components of higher reliability or by using additional equivalent parallel components in the reliability-wise configuration.

Keywords

  • rail vehicles
  • reliability allocation
  • decision model
Open Access

Methodology of Building the Strategy of Maintenance of Rail Vehicles with the Use of the Rams Analysis in the Area of Safety

Published Online: 21 Aug 2019
Page range: 219 - 244

Abstract

Abstract

The paper discusses one of the most important stages in the developed methodology for building a strategy of maintenance of railway vehicles, which is the RAMS analysis (Reliability, Availability, Maintainability, Safety) in the area of safety. The paper presents the application of RAMS analysis in the construction process (development or change) of the maintenance strategy on the example of a 6Dg diesel locomotive. Based on the conducted research, it was found that this analysis enables proper classification of hazards, quantification of the frequency of occurrence of hazards and the adoption of the appropriate criteria for risk assessment of the created strategy.

Keywords

  • RAMS analysis
  • railway vehicles
  • maintenance system
Open Access

The Influence of the Traffic Lights on Behaviour of Pedestrians at the Road Crossings

Published Online: 21 Aug 2019
Page range: 245 - 266

Abstract

Abstract

The article addressed the behaviour of pedestrians at road crossings based on the conducted studies. The introduction includes the discussed restrictions of pedestrian traffic in the city and basic data on pedestrian safety. The article presented the results of research including the behaviour of people at pedestrian crossings. The research included two types of pedestrian crossing: with and without traffic lights. Based on the observations made during the research and comparison of the results presenting the behaviour of pedestrians on both types of crossings, the influence of the traffic lights on behaviour of pedestrians at the road crossings was presented.

Keywords

  • pedestrian
  • traffic lights
  • pedestrian crossings
Open Access

Selected Problems of Liquid Fuels Storage in Army

Published Online: 21 Aug 2019
Page range: 267 - 282

Abstract

Abstract

The assessment of the suitability of fuel delivered to fuel bases and forecasting the maximum time of safe storage in specific storage capacities is a key element of an efficiently functioning storage system. Paper presents the results of research of long-term stability of liquid fuels, which, according to the authors, is crucial in the process of refreshing and rotation of fuels stored as tactical reserves of the Armed Forces. In addition, an analysis of the impact of selected factors on the increase in the intensity of ageing mechanisms is presented.

Keywords

  • liquid fuels
  • oxidation
  • ageing mechanisms
  • long-term storage
Open Access

Identification of Failure Causes in the Water Supply Network

Published Online: 21 Aug 2019
Page range: 283 - 300

Abstract

Abstract

Water supply network is the most likely element which can fail in the whole water supply system. Failures of the water supply network often results in limitation or lack of water supply to the consumers. Identification and ranking of failure causes in terms of frequency, are the possibility to present proposals of action, related to the replacement or modernization of the water supply network. In addition, the water supply network failures were related to the main parameter important for the water consumers the time of suspended supplying in water.

Keywords

  • water supply system
  • failure
  • lack of water
Open Access

Method of Analysis and Assessment of ICT System Safety in a Water Company

Published Online: 21 Aug 2019
Page range: 301 - 318

Abstract

Abstract

An important and very often overlooked issue in risk analysis in water supply systems is ICT safety. Water companies should take actions to protect the process of water delivery and water distribution from disruption or takeover of control by external entities. The aim of the work is to develop an author's method of analysis and assessment of the ICT system safety in a water company. It was assumed that the measure of ICT safety loss is the risk related to its functioning.

Keywords

  • water supply system
  • ICT system
  • safety
Open Access

The Effects of Roadside Hazards on Road Accident Severity

Published Online: 21 Aug 2019
Page range: 319 - 339

Abstract

Abstract

The risk of becoming involved in an accident emerges when elements of the transport system do not operate properly (man – vehicle – road – roadside). The road, its traffic layout and safety equipment have a critical impact on road user safety. This gives infrastructural work a priority in road safety strategies and programmes. Run-off-road accidents continue to be one of the biggest problems of road safety with consequences including vehicle roll-over or hitting a roadside object. This type of incident represents more than 20% of rural accidents and about 18% of all road deaths in Poland. Mathematical models must be developed to determine how selected roadside factors affect road safety and provide a basis for new roadside design rules and guidelines.

Keywords

  • road safety
  • roadside
  • hazards
Open Access

Estimating the Impact of Texture Depth on the Roughness of Cement Concrete Airfield Pavements

Published Online: 21 Aug 2019
Page range: 341 - 362

Abstract

Abstract

Appropriate skid resistance properties of airfield pavements are extremely important in terms of the safety of air operations. Their evaluation is not limited to the measurements of the coefficient of friction, which determines the roughness of a pavement, but also involves measuring the depth of the pavement texture (micro- and macrotexture), which is a component of the tire-pavement contact surface friction characteristics. It should be stressed that the current aviation documents do not contain a strict interconnection between the texture depth parameter and airfield pavement coefficient of friction criteria. Based on the result population gathered in the course of the field tests, the authors plan to determine the impact of texture on the roughness of airfield pavements.

Keywords

  • concrete airfield pavement
  • skid resistance properties
  • texture
  • roughness
Open Access

Search and Rescue System in Poland

Published Online: 21 Aug 2019
Page range: 363 - 375

Abstract

Abstract

On 25th of January 2018 Civil and Military Aeronautical Rescue Coordination Centre (ARCC) commenced operations in Polish Air Navigation Services Agency (PANSA). PANSA increased significantly its contribution in the domain of coordination of search and rescue activities in ASAR service in the Polish area of responsibility. Up to this date all tasks of ARCC Centre were conducted mainly by Armed Forces of Republic of Poland, which performed coordination function in ASAR (Aeronautical Search and Rescue) service. The bodies responsible were Aeronautical Search And Rescue Centre located in Air Operations Centre – Air Component Headquarter in Warsaw and sub-centre in Gdynia, part of Naval Operations Centre of Naval Component Headquarter.

According to international commitments resulting mainly from Convention on International Civil Aviation signed on 7th of December 1944 in Chicago and ratified by Poland together with Annex 12 “Search And Rescue”, Poland committed to establish aeronautical search and rescue service called ASAR within Polish region and to assure its operation. ASAR service is the only service in Poland for rescue purposes and is designated to search and rescue of aircraft in distress, provision of help for aircraft crews and passengers and other victims of aeronautical accidents (regardless to nationality of these aircraft and persons). ASAR service tasks include search of designated area to find location of aircraft and victims of aeronautical accidents, determination of their status and commencement of rescue actions at the location using dedicated forces and measures as well as forces and measures of another systems, mainly from State Medical Rescue, National Firefighting and Rescue System and Maritime Search and Rescue Service. ASAR service consists of:

a)commanding element – Civil-Military Aeronautical Rescue and Coordination Centre,

b)executive elements – Aeronautical Search and Rescue Teams (LZPR), and

c)supporting elements – alerting points (air traffic services units operating in the framework of alerting service).

Keywords

  • search and rescue
  • aeronautical accidents
  • aviation
  • civil and military
  • Polish Air Navigation Services Agency
Open Access

Reliability Analysis of an Industrial System Under Cost-Free Warranty and System Rest Policy

Published Online: 21 Aug 2019
Page range: 377 - 395

Abstract

Abstract

The aim of this paper is to analyze a system, which consists of two components, working under a cost-free warranty policy. Past literature reflects that till now the focus of researchers is those systems which work without taking rest. But here authors emphasized on an industrial system which takes rest after working for a specific amount of time. This strategy helps the system to run for a long time with less failure. After taking rest, the system starts its working again. During the mathematical modeling of the system various state of the same are critically analyzed. Reliability of the considered system has been obtained for the different combinations of failure and repair rates. Also, the various parameters which affect the system performance have been evaluated.

Keywords

  • performability
  • mathematical modeling
  • rest period
  • Markov process
  • warranty policy
Open Access

Benefitting from the Problem of Allocation in the Optimisation of the Order Picking Process

Published Online: 21 Aug 2019
Page range: 397 - 420

Abstract

Abstract

The article addressed the problem of the allocation of tasks in one of the warehouse processes (order picking). The objective was to obtain the optimum solution, which guarantees the minimum execution time of particular tasks by warehouse personnel. To optimise the issue mentioned above Excel spreadsheet with the Solver module was applied.

Keywords

  • order picking
  • optimisation
  • time
  • Excel
  • Solver module
Open Access

The Use of Instrumental Methods to Identify Liquid Fuels Applied in the Polish Armed Forces

Published Online: 21 Aug 2019
Page range: 421 - 429

Abstract

Abstract

The publication topic is to present the research results on the identification methodology of liquid fuels used in the Polish Armed Forces and beyond them. The part related to the use of non-standard instrumental methods to recognise the differences between various types of products was presented. The results of testing the samples of diesel fuels and fuels for aircraft turbine engines both from the civil market and from the stock of the armed forces were described. The usefulness of chromatography, infrared (IR) spectrometry and UV-VIS spectroscopy as instruments being an element of the procedure of the fuel type and origin identification was presented.

Keywords

  • aviation fuel
  • diesel fuel
  • spectroscopy
  • chromatography
  • laboratory tests
Open Access

Safety Assessment of Tram Stops

Published Online: 21 Aug 2019
Page range: 431 - 458

Abstract

Abstract

The safety of public transport stops is the subject of numerous studies in large agglomerations around the world. This is due to the fact that it is a passenger exchange zone where collisions and accidents involving people getting on or off public transport vehicles most often occur. For this reason, the purpose of the article is to present the results of the safety assessment of the stop zones for two selected tram lines in Wroclaw. The assessment of tram stops is based on an indicator that takes into account three parameters that affect the safety level of the tram stop zone - the location and infrastructure of the tram stop, its availability and traffic in the tram stop zone. The analysis of stops has been prepared on the basis of direct observation. As a result of the assessment process, these stops were indicated, whose safety index was the lowest. The improvement solutions for them should be prepared at first.

Keywords

  • safety
  • tram stop
  • public transport
Open Access

Evidential Networks for Evaluating Predictive Reliability of Mechatronics Systems under Epistemic Uncertainties

Published Online: 21 Aug 2019
Page range: 459 - 475

Abstract

Abstract

In reliability predicting field, the probabilistic approaches are based on data relating to the components which can be precisely known and validated by the return of experience REX, but in the case of complex systems with high-reliability precision such as mechatronic systems, uncertainties are inevitable and must be considered in order to predict with a degree of confidence the evaluated reliability. In this paper, firstly we present a brief review of the non-probabilistic approaches. Thereafter we present our methodology for assessing the reliability of the mechatronic system by taking into account the epistemic uncertainties (uncertainties in the reliability model and uncertainties in the reliability parameters) considered as a dynamic hybrid system and characterized by the existence of multi-domain interaction between its failed components. The key point in this study is to use an Evidential Network “EN” based on belief functions and the dynamic Bayesian network. Finally, an application is developed to illustrate the interest of the proposed methodology.

Keywords

  • epistemic uncertainties
  • uncertainty of model
  • belief function
  • evidential network
  • reliability
  • mechatronics
  • multi-domain interactions
Open Access

Modelling Consequences of Maritime Critical Infrastructure Accidents

Published Online: 21 Aug 2019
Page range: 477 - 495

Abstract

Abstract

The probabilistic general model of critical infrastructure accident consequences including the superposition of three models of the process of initiating events, the process of environment threats and the process of environment degradation is adopted to the maritime transport critical infrastructure. The general model is applied to this critical infrastructure accident with chemical release consequences identification and prediction. The model also includes the cost analysis of losses associated with these chemical releases. Further, under the assumption of the stress of weather influence on the ship operation condition, critical infrastructure accident losses are examined and the results are compared with the previous ones. Finally, the method of optimization are practically tested to the minimizing these losses and the procedures and the new strategy assuring lower environment losses of the considered critical infrastructure accidents are proposed.

Keywords

  • maritime transport
  • environment degradation
  • cost of losses
  • climate-weather change impact
  • optimization
24 Articles
Open Access

A Simulation Model for Regenerated Objects with Multiparameter Evaluation of Technical Condition Reliability Estimation

Published Online: 21 Aug 2019
Page range: 7 - 30

Abstract

Abstract

The paper presents the developed simulation model allowing one to estimate the reliability of objects whose technical condition is described by a set of geometrical features. Their values change during operation because of the wearing processes of the part under consideration. The operational availability (or unavailability) of a technical object is determined by the evaluation conducted using a set of criteria referring to its analysed features. In addition, the proposed model enables one to take into account the regeneration of such objects.

Keywords

  • reliability
  • wear
  • computer simulation
  • renewal
Open Access

The Use of Fuzzy Logic Elements for the Risk Analysis in Aviation

Published Online: 21 Aug 2019
Page range: 31 - 53

Abstract

Abstract

The paper presents the possibility of using fuzzy logic in aviation provided in an example of estimating the risk of a glider pilot. The results of expert questionnaires were used to define the input data concerning categories of loss and the probability of undesirable events occurrence. A model of inference and fuzzy sets concerning input and output data were defined. The risk analysis was performed in accordance with the standard fuzzy regulator scheme. Moreover, the results obtained were verified with the use of Risk Matrix and Risk Score methods.

Keywords

  • fuzzy logic
  • risk analysis
  • risk in aviation
Open Access

Water Loss Analysis as an Element of Operation Management of Water Supply System

Published Online: 21 Aug 2019
Page range: 55 - 77

Abstract

Abstract

The aim of the study was an cause and effect analysis of water losses in the collective water supply system of the city located in south-eastern Poland. The exploitation data provided by the water supply company from 2012 - 2016 was used for the analysis. The study uses the recommendations of the IWA (International Water Association) for the water balance making and determination of water loss indicators. The values of water loss indicators were compared to international standards and the technical condition of the network was determined. In addition, failure rate analysis of the water supply network was performed based on the failure rate index λ. Based on the performed analysis, it was found that the water supply company should consider renovation or replacement of the main network pipelines to increase the safety level of water supply, reduce the amount of water losses and the company exploitation costs.

Keywords

  • collective water supply system
  • failure rate
  • water losses
Open Access

The Concept of a Pneumatic Parachute Rescue System for Vertical Take-Off and Landing UAVs

Published Online: 21 Aug 2019
Page range: 79 - 100

Abstract

Abstract

This publication addresses the proposed structural solution for a system, of which the conceptual essence involves a rescue parachute being ejected from an accumulator using compressed carbon dioxide. The suggested rescue system is intended for unmanned multicopter aircraft. The article presents a developed digital solid model and the results of its simulation tests. The paper also contains results of basic calculations of the pneumatic supply system energy balance and the power balance of the electric control system. It also presents the results of first in-flight tests with a simulated emergency situation and the use of a technology demonstrator in operating conditions. Simulational and experimental methods were chosen to solve the research problem.

Keywords

  • parachute
  • pneumatics
  • multicopter
  • UAV
Open Access

The Aspect of Power Supply in Exploitation of Transport Telematics Systems

Published Online: 21 Aug 2019
Page range: 101 - 119

Abstract

Abstract

Transport telematics systems operate under various operational conditions. As elements, which are responsible, among others, for the transport process safety, they should maintain their usability. One of the key problems is to ensure the power supply continuity in the transport telematics systems. In order to provide it, relevant power supply systems are used. The state of unfitness of power supply constitutes a failure in the system operation, the result of which can be downtime in operation of the entire transport telematics system or its part. The article carried out a reliability and operation analysis of the power supply system, which consists of three independent energy sources. The relationships, which allow to specify the probabilities of the system’s staying in the distinguished states, were determined.

Keywords

  • transport telematics systems
  • power supply
  • reliability
Open Access

Issue of Assessment of the Strong Electromagnetic Pulses Impact on the Functioning of Selected Electronic Devices

Published Online: 21 Aug 2019
Page range: 121 - 138

Abstract

Abstract

By analyzing the exploitation process of selected electronic devices (including those used in communication and radiolocation systems), it can be concluded that they operate in heterogeneous, often extreme conditions. Their operate in a full ability state depends not only on the reliability of the subsystems that create them, but also on the effective management of their exploitation, including vulnerability and resistance to the impact of strong electromagnetic pulses. The article proposes specific criteria containing indicators that enable the assessment of the strong electromagnetic pulses impact on the functioning of selected electronic devices.

Keywords

  • high power microwave pulses
  • impact
  • reliability
Open Access

Diversification of Aviation Safety Management on the Basis of Differences Between GA and CAT

Published Online: 21 Aug 2019
Page range: 139 - 160

Abstract

Abstract

Due to the binding regulations, safety management processes in Poland, are carried out equally, regardless of the type of aviation. The article aims to present a proposal for the separation of Commercial Air Transport (CAT) and General Aviation (GA) in these processes to provide a more accurate assessment of the Polish aviation safety state. The key issue leading to further considerations is the comparison of the number of undesired events and their types in GA and CAT. Subsequently, an in-depth analysis of the State Safety Programm is presented, allowing for more detailed conclusions. The analysis presented in the paper indicates that it would be reasonable to separate particular types of aviation in the safety management processes. It was pointed out that the differences between GA and CAT are so significant that treating them together can lead to false and wrong conclusions.

Keywords

  • safety
  • aviation
  • safety indicators
Open Access

Technical Aspect Concerning Vessels Halt Safety Upon Terrorist Hazard

Published Online: 21 Aug 2019
Page range: 161 - 182

Abstract

Abstract

The article presented and analysed the reliability of water barriers as one of the methods of securing naval technical facilities against the terrorist attacks (motorboats with explosive materials) from the sea. Water tests of FOXX barriers were described as a means of protection against such a threat. The reliability of the barrier was modelled and simulated with the use of Finite Element Method (FEM).

Keywords

  • FEM
  • safety barriers
  • water barriers
Open Access

Analysis of a Possibility of Using Fuzzy Logic to Assess the Reliability of Aircraft On-Board Systems

Published Online: 21 Aug 2019
Page range: 183 - 198

Abstract

Abstract

The paper attempts to present the current state of knowledge in the use of fuzzy logic in order to assess the reliability of technical objects over the past two decades. In world literature, one can recall three main trends related to the use of fuzzy logic in the reliability estimation. The first one deals mainly with an analysis and assessment of the risk of failure. In the second mainstream, the researchers try to analyse the human factor, which also influences system malfunction. The third group of reliability studies the possibility of using fuzzy logic for proper service planning and thus preventing damage. In each of the three mentioned trends, fuzzy logic complements the classic methods of estimating and predicting reliability.

Keywords

  • reliability
  • fuzzy logic
  • aircraft on-board systems
Open Access

The Problem of Reliability Allocation in the Subassemblies of Rail Vehicles

Published Online: 21 Aug 2019
Page range: 199 - 218

Abstract

Abstract

The following paper concerns an application of reliability allocation as a method for achieving the desired level of reliability for a selected subassembly of a type 6Dg diesel locomotive. On the basis of real operational data for the investigated vehicle, a decision model was developed to solve the allocation problem. It was demonstrated that the locomotive’s reliability may be improved by replacing the individual components in the braking and pneumatic system with components of higher reliability or by using additional equivalent parallel components in the reliability-wise configuration.

Keywords

  • rail vehicles
  • reliability allocation
  • decision model
Open Access

Methodology of Building the Strategy of Maintenance of Rail Vehicles with the Use of the Rams Analysis in the Area of Safety

Published Online: 21 Aug 2019
Page range: 219 - 244

Abstract

Abstract

The paper discusses one of the most important stages in the developed methodology for building a strategy of maintenance of railway vehicles, which is the RAMS analysis (Reliability, Availability, Maintainability, Safety) in the area of safety. The paper presents the application of RAMS analysis in the construction process (development or change) of the maintenance strategy on the example of a 6Dg diesel locomotive. Based on the conducted research, it was found that this analysis enables proper classification of hazards, quantification of the frequency of occurrence of hazards and the adoption of the appropriate criteria for risk assessment of the created strategy.

Keywords

  • RAMS analysis
  • railway vehicles
  • maintenance system
Open Access

The Influence of the Traffic Lights on Behaviour of Pedestrians at the Road Crossings

Published Online: 21 Aug 2019
Page range: 245 - 266

Abstract

Abstract

The article addressed the behaviour of pedestrians at road crossings based on the conducted studies. The introduction includes the discussed restrictions of pedestrian traffic in the city and basic data on pedestrian safety. The article presented the results of research including the behaviour of people at pedestrian crossings. The research included two types of pedestrian crossing: with and without traffic lights. Based on the observations made during the research and comparison of the results presenting the behaviour of pedestrians on both types of crossings, the influence of the traffic lights on behaviour of pedestrians at the road crossings was presented.

Keywords

  • pedestrian
  • traffic lights
  • pedestrian crossings
Open Access

Selected Problems of Liquid Fuels Storage in Army

Published Online: 21 Aug 2019
Page range: 267 - 282

Abstract

Abstract

The assessment of the suitability of fuel delivered to fuel bases and forecasting the maximum time of safe storage in specific storage capacities is a key element of an efficiently functioning storage system. Paper presents the results of research of long-term stability of liquid fuels, which, according to the authors, is crucial in the process of refreshing and rotation of fuels stored as tactical reserves of the Armed Forces. In addition, an analysis of the impact of selected factors on the increase in the intensity of ageing mechanisms is presented.

Keywords

  • liquid fuels
  • oxidation
  • ageing mechanisms
  • long-term storage
Open Access

Identification of Failure Causes in the Water Supply Network

Published Online: 21 Aug 2019
Page range: 283 - 300

Abstract

Abstract

Water supply network is the most likely element which can fail in the whole water supply system. Failures of the water supply network often results in limitation or lack of water supply to the consumers. Identification and ranking of failure causes in terms of frequency, are the possibility to present proposals of action, related to the replacement or modernization of the water supply network. In addition, the water supply network failures were related to the main parameter important for the water consumers the time of suspended supplying in water.

Keywords

  • water supply system
  • failure
  • lack of water
Open Access

Method of Analysis and Assessment of ICT System Safety in a Water Company

Published Online: 21 Aug 2019
Page range: 301 - 318

Abstract

Abstract

An important and very often overlooked issue in risk analysis in water supply systems is ICT safety. Water companies should take actions to protect the process of water delivery and water distribution from disruption or takeover of control by external entities. The aim of the work is to develop an author's method of analysis and assessment of the ICT system safety in a water company. It was assumed that the measure of ICT safety loss is the risk related to its functioning.

Keywords

  • water supply system
  • ICT system
  • safety
Open Access

The Effects of Roadside Hazards on Road Accident Severity

Published Online: 21 Aug 2019
Page range: 319 - 339

Abstract

Abstract

The risk of becoming involved in an accident emerges when elements of the transport system do not operate properly (man – vehicle – road – roadside). The road, its traffic layout and safety equipment have a critical impact on road user safety. This gives infrastructural work a priority in road safety strategies and programmes. Run-off-road accidents continue to be one of the biggest problems of road safety with consequences including vehicle roll-over or hitting a roadside object. This type of incident represents more than 20% of rural accidents and about 18% of all road deaths in Poland. Mathematical models must be developed to determine how selected roadside factors affect road safety and provide a basis for new roadside design rules and guidelines.

Keywords

  • road safety
  • roadside
  • hazards
Open Access

Estimating the Impact of Texture Depth on the Roughness of Cement Concrete Airfield Pavements

Published Online: 21 Aug 2019
Page range: 341 - 362

Abstract

Abstract

Appropriate skid resistance properties of airfield pavements are extremely important in terms of the safety of air operations. Their evaluation is not limited to the measurements of the coefficient of friction, which determines the roughness of a pavement, but also involves measuring the depth of the pavement texture (micro- and macrotexture), which is a component of the tire-pavement contact surface friction characteristics. It should be stressed that the current aviation documents do not contain a strict interconnection between the texture depth parameter and airfield pavement coefficient of friction criteria. Based on the result population gathered in the course of the field tests, the authors plan to determine the impact of texture on the roughness of airfield pavements.

Keywords

  • concrete airfield pavement
  • skid resistance properties
  • texture
  • roughness
Open Access

Search and Rescue System in Poland

Published Online: 21 Aug 2019
Page range: 363 - 375

Abstract

Abstract

On 25th of January 2018 Civil and Military Aeronautical Rescue Coordination Centre (ARCC) commenced operations in Polish Air Navigation Services Agency (PANSA). PANSA increased significantly its contribution in the domain of coordination of search and rescue activities in ASAR service in the Polish area of responsibility. Up to this date all tasks of ARCC Centre were conducted mainly by Armed Forces of Republic of Poland, which performed coordination function in ASAR (Aeronautical Search and Rescue) service. The bodies responsible were Aeronautical Search And Rescue Centre located in Air Operations Centre – Air Component Headquarter in Warsaw and sub-centre in Gdynia, part of Naval Operations Centre of Naval Component Headquarter.

According to international commitments resulting mainly from Convention on International Civil Aviation signed on 7th of December 1944 in Chicago and ratified by Poland together with Annex 12 “Search And Rescue”, Poland committed to establish aeronautical search and rescue service called ASAR within Polish region and to assure its operation. ASAR service is the only service in Poland for rescue purposes and is designated to search and rescue of aircraft in distress, provision of help for aircraft crews and passengers and other victims of aeronautical accidents (regardless to nationality of these aircraft and persons). ASAR service tasks include search of designated area to find location of aircraft and victims of aeronautical accidents, determination of their status and commencement of rescue actions at the location using dedicated forces and measures as well as forces and measures of another systems, mainly from State Medical Rescue, National Firefighting and Rescue System and Maritime Search and Rescue Service. ASAR service consists of:

a)commanding element – Civil-Military Aeronautical Rescue and Coordination Centre,

b)executive elements – Aeronautical Search and Rescue Teams (LZPR), and

c)supporting elements – alerting points (air traffic services units operating in the framework of alerting service).

Keywords

  • search and rescue
  • aeronautical accidents
  • aviation
  • civil and military
  • Polish Air Navigation Services Agency
Open Access

Reliability Analysis of an Industrial System Under Cost-Free Warranty and System Rest Policy

Published Online: 21 Aug 2019
Page range: 377 - 395

Abstract

Abstract

The aim of this paper is to analyze a system, which consists of two components, working under a cost-free warranty policy. Past literature reflects that till now the focus of researchers is those systems which work without taking rest. But here authors emphasized on an industrial system which takes rest after working for a specific amount of time. This strategy helps the system to run for a long time with less failure. After taking rest, the system starts its working again. During the mathematical modeling of the system various state of the same are critically analyzed. Reliability of the considered system has been obtained for the different combinations of failure and repair rates. Also, the various parameters which affect the system performance have been evaluated.

Keywords

  • performability
  • mathematical modeling
  • rest period
  • Markov process
  • warranty policy
Open Access

Benefitting from the Problem of Allocation in the Optimisation of the Order Picking Process

Published Online: 21 Aug 2019
Page range: 397 - 420

Abstract

Abstract

The article addressed the problem of the allocation of tasks in one of the warehouse processes (order picking). The objective was to obtain the optimum solution, which guarantees the minimum execution time of particular tasks by warehouse personnel. To optimise the issue mentioned above Excel spreadsheet with the Solver module was applied.

Keywords

  • order picking
  • optimisation
  • time
  • Excel
  • Solver module
Open Access

The Use of Instrumental Methods to Identify Liquid Fuels Applied in the Polish Armed Forces

Published Online: 21 Aug 2019
Page range: 421 - 429

Abstract

Abstract

The publication topic is to present the research results on the identification methodology of liquid fuels used in the Polish Armed Forces and beyond them. The part related to the use of non-standard instrumental methods to recognise the differences between various types of products was presented. The results of testing the samples of diesel fuels and fuels for aircraft turbine engines both from the civil market and from the stock of the armed forces were described. The usefulness of chromatography, infrared (IR) spectrometry and UV-VIS spectroscopy as instruments being an element of the procedure of the fuel type and origin identification was presented.

Keywords

  • aviation fuel
  • diesel fuel
  • spectroscopy
  • chromatography
  • laboratory tests
Open Access

Safety Assessment of Tram Stops

Published Online: 21 Aug 2019
Page range: 431 - 458

Abstract

Abstract

The safety of public transport stops is the subject of numerous studies in large agglomerations around the world. This is due to the fact that it is a passenger exchange zone where collisions and accidents involving people getting on or off public transport vehicles most often occur. For this reason, the purpose of the article is to present the results of the safety assessment of the stop zones for two selected tram lines in Wroclaw. The assessment of tram stops is based on an indicator that takes into account three parameters that affect the safety level of the tram stop zone - the location and infrastructure of the tram stop, its availability and traffic in the tram stop zone. The analysis of stops has been prepared on the basis of direct observation. As a result of the assessment process, these stops were indicated, whose safety index was the lowest. The improvement solutions for them should be prepared at first.

Keywords

  • safety
  • tram stop
  • public transport
Open Access

Evidential Networks for Evaluating Predictive Reliability of Mechatronics Systems under Epistemic Uncertainties

Published Online: 21 Aug 2019
Page range: 459 - 475

Abstract

Abstract

In reliability predicting field, the probabilistic approaches are based on data relating to the components which can be precisely known and validated by the return of experience REX, but in the case of complex systems with high-reliability precision such as mechatronic systems, uncertainties are inevitable and must be considered in order to predict with a degree of confidence the evaluated reliability. In this paper, firstly we present a brief review of the non-probabilistic approaches. Thereafter we present our methodology for assessing the reliability of the mechatronic system by taking into account the epistemic uncertainties (uncertainties in the reliability model and uncertainties in the reliability parameters) considered as a dynamic hybrid system and characterized by the existence of multi-domain interaction between its failed components. The key point in this study is to use an Evidential Network “EN” based on belief functions and the dynamic Bayesian network. Finally, an application is developed to illustrate the interest of the proposed methodology.

Keywords

  • epistemic uncertainties
  • uncertainty of model
  • belief function
  • evidential network
  • reliability
  • mechatronics
  • multi-domain interactions
Open Access

Modelling Consequences of Maritime Critical Infrastructure Accidents

Published Online: 21 Aug 2019
Page range: 477 - 495

Abstract

Abstract

The probabilistic general model of critical infrastructure accident consequences including the superposition of three models of the process of initiating events, the process of environment threats and the process of environment degradation is adopted to the maritime transport critical infrastructure. The general model is applied to this critical infrastructure accident with chemical release consequences identification and prediction. The model also includes the cost analysis of losses associated with these chemical releases. Further, under the assumption of the stress of weather influence on the ship operation condition, critical infrastructure accident losses are examined and the results are compared with the previous ones. Finally, the method of optimization are practically tested to the minimizing these losses and the procedures and the new strategy assuring lower environment losses of the considered critical infrastructure accidents are proposed.

Keywords

  • maritime transport
  • environment degradation
  • cost of losses
  • climate-weather change impact
  • optimization

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