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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 41 (2017): Issue 1 (March 2017)

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

Search

14 Articles
Open Access

Computer recognition of data structures using cluster analysis and the theory of mathematical records

Published Online: 01 Nov 2017
Page range: 5 - 20

Abstract

Abstract

The paper proposes a new approach to the agglomeration of data in cluster analysis. The new approach assumes that sets of similar events are attributed to the cumulative probability of their occurrence at the same time. Such approaches will not be found in probability. Thanks to the mathematical theory of records fairly accurate classification of the object can be provided. This is the method which can be used in the cluster analysis by agglomeration. Figure 1 has been drawn for the purposes of better illustration of the problem. It shows the problem of classifying an object to one of the two classes: suitable or unsuitable for further use. Thanks to the merger of two classifiers: KNN algorithm (k nearest neighbours) and belief function a model was created, which is pretty strong as it seems to discriminate against space objects. It therefore seems reasonable to discriminate space of objects. The paper also shows a possibility of applying the proposed model to classification and the correlation between cytokines and features related to the occurrence of lymphocytic leukaemia. It therefore seems justified to carry out tests on this new method as regards various scientific problems.

Keywords

  • mathematical methods
  • cluster analysis
Open Access

Analysis and assessment of water treatment plant reliability

Published Online: 01 Nov 2017
Page range: 21 - 38

Abstract

Abstract

The subject of the publication is the analysis and assessment of the reliability of the surface water treatment plant (WTP). In the study the one parameter method of reliability assessment was used. Based on the flow sheet derived from the water company the reliability scheme of the analysed WTP was prepared. On the basis of the daily WTP work report the availability index Kg for the individual elements included in the WTP, was determined. Then, based on the developed reliability scheme showing the interrelationships between elements, the availability index Kg for the whole WTP was determined. The obtained value of the availability index Kg was compared with the criteria values.

Keywords

  • reliability
  • the availability index
  • water treatment plant
Open Access

Reliability analysis of the power supply system of closed-circuit television system used at a highway toll collection point

Published Online: 01 Nov 2017
Page range: 39 - 58

Abstract

Abstract

The article presents issues concerning the power supply systems of closed-circuit television systems used at a highway toll collection point. The general diagram of the power supply system was presented, and then the reliability analysis was conducted. This enabled to develop a relationships graph, on the basis of which the Chapman–Kolmogorov system of equations describing it was created. On this basis, it was possible to set the relationships allowing to calculate the probability values of the system’s staying (in symbolic terms) in the following functional states: of full ability SPZ, of non-full ability SZB1 and SZB2, and of unfitness SB.

Keywords

  • Closed-circuit television
  • reliability
  • power supply
Open Access

Analysis of aeronautical information potential incompatibility – case study

Published Online: 01 Nov 2017
Page range: 59 - 82

Abstract

Abstract

This article is a continuation of the authors’ study on the ways to ensure the quality and safety of aeronautical data and information. In its content the Integrated Aeronautical Information Package was presented and its fundamental part AIP Poland was described. In addition, the docking guidance system A-VDGS, being an example of implementation of telematics system in air transport, was discussed as well as its requirements and schematic representation were attached. In the following part of the publication an analysis of AIP Poland in terms of the mentioned aircrafts’ docking systems was performed and a discrepancy between the requirements published in ICAO Annex 14 and published information for aerodrome EPWA was noticed. The indicated case of published incompatibility confirms the necessity to develop and implement a complex method of aeronautical data and information quality assurance at all stages of aeronautical data and information chain, which will be the subject of authors’ further study.

Keywords

  • aeronautical data and information quality
  • AIP Poland
  • A-VDGS system
Open Access

RAMS analysis of railway vehicles’ lifecycle

Published Online: 01 Nov 2017
Page range: 83 - 106

Abstract

Abstract

The presented paper investigates the issues concerned with the RAMS analysis with the reference to the railway means of transport. The RAMS analysis includes the quantitative and qualitative indicators of degree, that the system and its components will meet all the assumed functions preserving the requirements of the availability and safety. RAMS is a long-term process, resulted from the applied tools and techniques throughout the life cycle of railway means of transport. The overall guidelines related to the development of RAMS features are included in PN-EN 50126 Railway Applications - The Specification and Demonstration of Reliability, Availability, Maintainability and Safety (RAMS).

Keywords

  • life cycle
  • RAMS analysis
  • railway means of transport
Open Access

Wireless control process technical exploitation facility

Published Online: 01 Nov 2017
Page range: 107 - 128

Abstract

Abstract

In the article presents issues related to the control for which wireless is utilized in object technology. During the tests performed the technical parameters were determined the quality of control the object of the mobile cellular telephone system. It also analyzes the impact of the delay time of signal transmission control on the technical parameters of the object.

Keywords

  • transmission
  • control
  • technical object
Open Access

Problems of reliability assessment of impact excitation systems of hydraulic hammers

Published Online: 01 Nov 2017
Page range: 129 - 150

Abstract

Abstract

The topological structures of impact excitation systems in hydraulic hammers were characterized. Basic problems of reliability prediction of elements of these systems are defined. The main factors determining the reliability of working systems were identified. As an application example, the research results of small-sized hydraulic hammers are presented for which the statistical distributions of the maximum values of stresses generated in systems “beater - tool” are estimated. On this basis, the reliability prediction of impact excitation systems of these hammers was made.

Keywords

  • hydraulic hammers
  • impact excitation systems
  • reliability
Open Access

Geometrical analysis of profile of certain heavy terrain sections exerting dynamic loads on the chassis components of off-road vehicles

Published Online: 01 Nov 2017
Page range: 151 - 170

Abstract

Abstract

The paper presents the results of measurements concerned with the changes of profile height observed on selected heavy terrain road sections. Based on the results of direct measurements, primary indicators and amplitude frequency characteristics have been determined. The characteristics of these roads profiles have been presented as a function of path frequency, and also as a function of the vehicle wheels’ excitation frequency observed while driving at a certain, constant speed. The results presented serve as a source of information on specific heavy terrain road sections exerting dynamic loads on the vehicle’s chassis components while driving in off-road conditions.

Keywords

  • off-road vehicles
  • heavy terrain roads
Open Access

Security management of water supply

Published Online: 01 Nov 2017
Page range: 171 - 188

Abstract

Abstract

The main aim of this work is to present operational problems concerning the safety of the water supply and the procedures for risk management systems functioning public water supply (CWSS) and including methods of hazard identification and risk assessment. Developed a problem analysis and risk assessment, including procedures called. WSP, which is recommended by the World Health Organization (WHO) as a tool for comprehensive security management of water supply from source to consumer. Water safety plan is a key element of the strategy for prevention of adverse events in CWSS.

Keywords

  • water safety plan
  • risk analysis
Open Access

Application of K1/3 weather coefficient to tropical cyclone avoidance

Published Online: 01 Nov 2017
Page range: 189 - 206

Abstract

Abstract

The article presents the results of an application of K1/3 weather coefficient to tropical cyclone avoidance manoeuvre on the example of a tropical cyclones GASTON in the North Atlantic in. Avoidance manoeuvre was planned with the use of the Bon Voyage ORS (Onboard Routing System) of the AWT and also with the use of the programme CYKLON. The routes considered in the Bon Voyage system were generated by the route optimization algorithms of the system and routes programmed manually were generated by the system operator. Weather coefficient K1/3 was utilized as an index of safety of navigation in decision making regarding the ultimate route choice of all route variants generated and programmed in both decision making support systems. Results obtained point at the legitimacy of utilizing several decision support systems in solving the problem of tropical cyclone avoidance manoeuvre.

Keywords

  • ship route programming
  • tropical cyclone
  • Bon Voyage system
  • K weather coefficient
  • safety index
Open Access

Investigating the trends of average costs of corrective maintenance of public transport vehicles

Published Online: 01 Nov 2017
Page range: 207 - 226

Abstract

Abstract

This paper presents the results of the investigations of the trends of average costs incurred by manufacturers of public transport vehicles following the elimination of unplanned malfunctions under warranty. The developed research methodology utilizes a method of analysis of variance for validation of the following two hypotheses. The first hypothesis relates to the examination of the significance of differences between average costs of the elimination of a malfunction and the other relates to the examination of the significance of differences in the average number of malfunctions per single vehicle in the highlighted periods of operation. The hypotheses were conducted based on the operation data relating to the malfunctions of a fleet of trams used by a city transport operator.

Keywords

  • public transport
  • corrective maintenance
  • maintenance cost
Open Access

Corrosion of ammunition dumped in the Baltic Sea

Published Online: 01 Nov 2017
Page range: 227 - 246

Abstract

Abstract

The article presents the preliminary results of a research aimed at preparation for the extraction of chemical ammunition immersed after the Second World War(WWII) in the waters of the Baltic Sea (BS). It has been 70 years since the first steps aiming at elimination of mainly German chemical weapons were taken, while the expected durability (tightness) of metal barrels construction or other containers was estimated at 50-60 years. Consequently there is a serious risk of contamination of the Baltic Sea waters, not only with toxic warfare agents but also with the products of their decomposition. The evaluation of barrels’ and containers’ with TWA corrosion processes progress will determine the possibility of these munitions extraction to the surface in order to perform their classic utilization.

Keywords

  • corrosion
  • toxic warfare agents
  • sea water
Open Access

Assessment methods of production processes reliability – state of the art

Published Online: 01 Nov 2017
Page range: 247 - 276

Abstract

Abstract

In the paper, authors focus on a problem of reliable performance of production processes. Reliability analyses of production systems regard considering many different factors and requirements. As a result, the paper discusses the basic definitions from the area of production engineering and reliability theory. Based on the literature research, there is proposed a basic classification of methods for production processes reliability assessment. Later, authors focus on the development of a multidimensional approach to production process reliability assessment. The work ends up with summary and directions for further research.

Keywords

  • production process
  • reliability assessment
  • literature review
Open Access

Teaching methodology of the diagnosing process on the example of the fire alarm system

Published Online: 01 Nov 2017
Page range: 277 - 308

Abstract

Abstract

The article presents a method of teaching the process of diagnosing the technical and functional condition of the fire alarm system (SSP). The fire alarm system’s laboratory model is a representation of a real fire alarm system. The lecturer has the opportunity to inflict several different independent damage. The aim of the laboratory exercise is to familiarize students with the methodology and structure of the fire alarm system diagnosing process.

Keywords

  • detector
  • fire alarm system
  • diagnosis
14 Articles
Open Access

Computer recognition of data structures using cluster analysis and the theory of mathematical records

Published Online: 01 Nov 2017
Page range: 5 - 20

Abstract

Abstract

The paper proposes a new approach to the agglomeration of data in cluster analysis. The new approach assumes that sets of similar events are attributed to the cumulative probability of their occurrence at the same time. Such approaches will not be found in probability. Thanks to the mathematical theory of records fairly accurate classification of the object can be provided. This is the method which can be used in the cluster analysis by agglomeration. Figure 1 has been drawn for the purposes of better illustration of the problem. It shows the problem of classifying an object to one of the two classes: suitable or unsuitable for further use. Thanks to the merger of two classifiers: KNN algorithm (k nearest neighbours) and belief function a model was created, which is pretty strong as it seems to discriminate against space objects. It therefore seems reasonable to discriminate space of objects. The paper also shows a possibility of applying the proposed model to classification and the correlation between cytokines and features related to the occurrence of lymphocytic leukaemia. It therefore seems justified to carry out tests on this new method as regards various scientific problems.

Keywords

  • mathematical methods
  • cluster analysis
Open Access

Analysis and assessment of water treatment plant reliability

Published Online: 01 Nov 2017
Page range: 21 - 38

Abstract

Abstract

The subject of the publication is the analysis and assessment of the reliability of the surface water treatment plant (WTP). In the study the one parameter method of reliability assessment was used. Based on the flow sheet derived from the water company the reliability scheme of the analysed WTP was prepared. On the basis of the daily WTP work report the availability index Kg for the individual elements included in the WTP, was determined. Then, based on the developed reliability scheme showing the interrelationships between elements, the availability index Kg for the whole WTP was determined. The obtained value of the availability index Kg was compared with the criteria values.

Keywords

  • reliability
  • the availability index
  • water treatment plant
Open Access

Reliability analysis of the power supply system of closed-circuit television system used at a highway toll collection point

Published Online: 01 Nov 2017
Page range: 39 - 58

Abstract

Abstract

The article presents issues concerning the power supply systems of closed-circuit television systems used at a highway toll collection point. The general diagram of the power supply system was presented, and then the reliability analysis was conducted. This enabled to develop a relationships graph, on the basis of which the Chapman–Kolmogorov system of equations describing it was created. On this basis, it was possible to set the relationships allowing to calculate the probability values of the system’s staying (in symbolic terms) in the following functional states: of full ability SPZ, of non-full ability SZB1 and SZB2, and of unfitness SB.

Keywords

  • Closed-circuit television
  • reliability
  • power supply
Open Access

Analysis of aeronautical information potential incompatibility – case study

Published Online: 01 Nov 2017
Page range: 59 - 82

Abstract

Abstract

This article is a continuation of the authors’ study on the ways to ensure the quality and safety of aeronautical data and information. In its content the Integrated Aeronautical Information Package was presented and its fundamental part AIP Poland was described. In addition, the docking guidance system A-VDGS, being an example of implementation of telematics system in air transport, was discussed as well as its requirements and schematic representation were attached. In the following part of the publication an analysis of AIP Poland in terms of the mentioned aircrafts’ docking systems was performed and a discrepancy between the requirements published in ICAO Annex 14 and published information for aerodrome EPWA was noticed. The indicated case of published incompatibility confirms the necessity to develop and implement a complex method of aeronautical data and information quality assurance at all stages of aeronautical data and information chain, which will be the subject of authors’ further study.

Keywords

  • aeronautical data and information quality
  • AIP Poland
  • A-VDGS system
Open Access

RAMS analysis of railway vehicles’ lifecycle

Published Online: 01 Nov 2017
Page range: 83 - 106

Abstract

Abstract

The presented paper investigates the issues concerned with the RAMS analysis with the reference to the railway means of transport. The RAMS analysis includes the quantitative and qualitative indicators of degree, that the system and its components will meet all the assumed functions preserving the requirements of the availability and safety. RAMS is a long-term process, resulted from the applied tools and techniques throughout the life cycle of railway means of transport. The overall guidelines related to the development of RAMS features are included in PN-EN 50126 Railway Applications - The Specification and Demonstration of Reliability, Availability, Maintainability and Safety (RAMS).

Keywords

  • life cycle
  • RAMS analysis
  • railway means of transport
Open Access

Wireless control process technical exploitation facility

Published Online: 01 Nov 2017
Page range: 107 - 128

Abstract

Abstract

In the article presents issues related to the control for which wireless is utilized in object technology. During the tests performed the technical parameters were determined the quality of control the object of the mobile cellular telephone system. It also analyzes the impact of the delay time of signal transmission control on the technical parameters of the object.

Keywords

  • transmission
  • control
  • technical object
Open Access

Problems of reliability assessment of impact excitation systems of hydraulic hammers

Published Online: 01 Nov 2017
Page range: 129 - 150

Abstract

Abstract

The topological structures of impact excitation systems in hydraulic hammers were characterized. Basic problems of reliability prediction of elements of these systems are defined. The main factors determining the reliability of working systems were identified. As an application example, the research results of small-sized hydraulic hammers are presented for which the statistical distributions of the maximum values of stresses generated in systems “beater - tool” are estimated. On this basis, the reliability prediction of impact excitation systems of these hammers was made.

Keywords

  • hydraulic hammers
  • impact excitation systems
  • reliability
Open Access

Geometrical analysis of profile of certain heavy terrain sections exerting dynamic loads on the chassis components of off-road vehicles

Published Online: 01 Nov 2017
Page range: 151 - 170

Abstract

Abstract

The paper presents the results of measurements concerned with the changes of profile height observed on selected heavy terrain road sections. Based on the results of direct measurements, primary indicators and amplitude frequency characteristics have been determined. The characteristics of these roads profiles have been presented as a function of path frequency, and also as a function of the vehicle wheels’ excitation frequency observed while driving at a certain, constant speed. The results presented serve as a source of information on specific heavy terrain road sections exerting dynamic loads on the vehicle’s chassis components while driving in off-road conditions.

Keywords

  • off-road vehicles
  • heavy terrain roads
Open Access

Security management of water supply

Published Online: 01 Nov 2017
Page range: 171 - 188

Abstract

Abstract

The main aim of this work is to present operational problems concerning the safety of the water supply and the procedures for risk management systems functioning public water supply (CWSS) and including methods of hazard identification and risk assessment. Developed a problem analysis and risk assessment, including procedures called. WSP, which is recommended by the World Health Organization (WHO) as a tool for comprehensive security management of water supply from source to consumer. Water safety plan is a key element of the strategy for prevention of adverse events in CWSS.

Keywords

  • water safety plan
  • risk analysis
Open Access

Application of K1/3 weather coefficient to tropical cyclone avoidance

Published Online: 01 Nov 2017
Page range: 189 - 206

Abstract

Abstract

The article presents the results of an application of K1/3 weather coefficient to tropical cyclone avoidance manoeuvre on the example of a tropical cyclones GASTON in the North Atlantic in. Avoidance manoeuvre was planned with the use of the Bon Voyage ORS (Onboard Routing System) of the AWT and also with the use of the programme CYKLON. The routes considered in the Bon Voyage system were generated by the route optimization algorithms of the system and routes programmed manually were generated by the system operator. Weather coefficient K1/3 was utilized as an index of safety of navigation in decision making regarding the ultimate route choice of all route variants generated and programmed in both decision making support systems. Results obtained point at the legitimacy of utilizing several decision support systems in solving the problem of tropical cyclone avoidance manoeuvre.

Keywords

  • ship route programming
  • tropical cyclone
  • Bon Voyage system
  • K weather coefficient
  • safety index
Open Access

Investigating the trends of average costs of corrective maintenance of public transport vehicles

Published Online: 01 Nov 2017
Page range: 207 - 226

Abstract

Abstract

This paper presents the results of the investigations of the trends of average costs incurred by manufacturers of public transport vehicles following the elimination of unplanned malfunctions under warranty. The developed research methodology utilizes a method of analysis of variance for validation of the following two hypotheses. The first hypothesis relates to the examination of the significance of differences between average costs of the elimination of a malfunction and the other relates to the examination of the significance of differences in the average number of malfunctions per single vehicle in the highlighted periods of operation. The hypotheses were conducted based on the operation data relating to the malfunctions of a fleet of trams used by a city transport operator.

Keywords

  • public transport
  • corrective maintenance
  • maintenance cost
Open Access

Corrosion of ammunition dumped in the Baltic Sea

Published Online: 01 Nov 2017
Page range: 227 - 246

Abstract

Abstract

The article presents the preliminary results of a research aimed at preparation for the extraction of chemical ammunition immersed after the Second World War(WWII) in the waters of the Baltic Sea (BS). It has been 70 years since the first steps aiming at elimination of mainly German chemical weapons were taken, while the expected durability (tightness) of metal barrels construction or other containers was estimated at 50-60 years. Consequently there is a serious risk of contamination of the Baltic Sea waters, not only with toxic warfare agents but also with the products of their decomposition. The evaluation of barrels’ and containers’ with TWA corrosion processes progress will determine the possibility of these munitions extraction to the surface in order to perform their classic utilization.

Keywords

  • corrosion
  • toxic warfare agents
  • sea water
Open Access

Assessment methods of production processes reliability – state of the art

Published Online: 01 Nov 2017
Page range: 247 - 276

Abstract

Abstract

In the paper, authors focus on a problem of reliable performance of production processes. Reliability analyses of production systems regard considering many different factors and requirements. As a result, the paper discusses the basic definitions from the area of production engineering and reliability theory. Based on the literature research, there is proposed a basic classification of methods for production processes reliability assessment. Later, authors focus on the development of a multidimensional approach to production process reliability assessment. The work ends up with summary and directions for further research.

Keywords

  • production process
  • reliability assessment
  • literature review
Open Access

Teaching methodology of the diagnosing process on the example of the fire alarm system

Published Online: 01 Nov 2017
Page range: 277 - 308

Abstract

Abstract

The article presents a method of teaching the process of diagnosing the technical and functional condition of the fire alarm system (SSP). The fire alarm system’s laboratory model is a representation of a real fire alarm system. The lecturer has the opportunity to inflict several different independent damage. The aim of the laboratory exercise is to familiarize students with the methodology and structure of the fire alarm system diagnosing process.

Keywords

  • detector
  • fire alarm system
  • diagnosis

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