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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 47 (2018): Issue 1 (December 2018)

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

Search

9 Articles
Open Access

Lightness Factors and Exertion Factors Related to its Own Mass of Fiber Reinforced Plastics (FRP) Applied in Composite Aeronautical Structures (Part 1)

Published Online: 31 Dec 2018
Page range: 5 - 22

Abstract

Abstract

The paper concerns an application of lightness factors in comparative analysis of strength properties of basic materials being applied in aeronautical structures – in a historical perspective. The use of lightness factors enables effective estimation how lighter will be the structural elements (of the same strength or stiffness) made from different kind of materials : traditional as well as advanced composites. It is quite easy to find the solution to the inverse problem, i.e. to estimate how differ will be stiffness or strength for the same mass of the structural elements. Very particular application of the lightness factors are noted in engineers calculations of composite gliders wing spars, where they appears as the materials constants and as structure loading factors as well. The paper presents some examples of application of the lightness factors in strength analysis of the composite shells applied in the shear webs of the wing spars, and refers to the design recommendations issued by German aviation authority (LBA).

Keywords

  • aircraft
  • composites
Open Access

Lightness Factors and Exertion Factors Related to its Own Mass of Fiber Reinforced Plastics (FRP) Applied in Composite Aeronautical Structures (Part 2)

Published Online: 31 Dec 2018
Page range: 23 - 43

Abstract

Abstract

The paper concerns an application of lightness factors in comparative analysis of strength properties of basic materials being applied in aeronautical structures – in a historical perspective. The use of lightness factors enables effective estimation how lighter will be the structural elements (of the same strength or stiffness) made from different kind of materials : traditional as well as advanced composites. It is quite easy to find the solution to the inverse problem, i.e. to estimate how differ will be stiffness or strength for the same mass of the structural elements. Very particular application of the lightness factors are noted in engineers calculations of composite gliders wing spars, where they appears as the materials constants and as structure loading factors as well. The paper presents some examples of application of the lightness factors in strength analysis of the composite shells applied in the shear webs of the wing spars, and refers to the design recommendations issued by German aviation authority (LBA).

Keywords

  • aircraft
  • composites
Open Access

Analysis of Selected Reliability Indicators of Water Supply Network

Published Online: 31 Dec 2018
Page range: 45 - 65

Abstract

Abstract

The operation of the water supply network is related to ensuring the reliability of water supply to each customer. The reliability analysis of water supply can be based on reliability indicators of renewable objects such as water pipes. These indicators take into account the characteristics of the system and its components, by function or numerical characteristics. An example of reliability analysis for main and distribution pipes was made. The average renewal time, the average working time without failure and the reliability of network operation were determined.

Keywords

  • water supply network
  • reliability
  • reliability indicators
Open Access

Quality Analysis of Water Network Failure

Published Online: 31 Dec 2018
Page range: 67 - 85

Abstract

Abstract

The main objective of the study was to analyse and assess the failure rate of the water supply system of a provincial city located in south-eastern Poland. In the analysis the exploitation data provided by the water supply company were used. The received data include, among others, material structure, age of water supply network and failure log. The failure rate analysis of the water supply network was based on the failure rate index λ [failure/(km∙year)]. Based on the performed analysis, it was found that the water company should consider renovating or replacing steel pipes.

Keywords

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

Analysis and Testing of Reliability of Military Vehicles

Published Online: 31 Dec 2018
Page range: 87 - 103

Abstract

Abstract

The subjects of this publication are the issue of reliability studies of military vehicles, the determination of reliability indicators of selected groups of vehicles, and the adoption of complex models of operation for analysis based on recorded operational events. Numerical simulations of operating states were performed to verify the models and the adopted reliability indicators. It has been shown that it is possible to use the obtained results of research in the economic efficiency-oriented military vehicle management system in order to minimize structural surpluses and increase the efficiency of the land technology equipment park.

Keywords

  • vehicle
  • operation
  • model
Open Access

Analysis and Testing of Reliability Information Systems in Analysis of the Operation-Related Process in the Army

Published Online: 31 Dec 2018
Page range: 105 - 122

Abstract

Abstract

This paper focuses on the determination of effectiveness of the implemented system ZWSI RON in an analysis of the vehicles operation process in the army. With this end in view, a questionnaire-based diagnostic survey was conducted on staff members of the technical services of the Polish Army logistics units. The survey research results analysis shows that 90% of the respondents do not use the basic PM (Plant Maintenance) module of the ZWSI RON system to manage the operation of military vehicles. One should consider a modification of the mentioned system, i.e. creating new modules and new relations between individual modules of the system, using SAP system structure solutions.

Keywords

  • information system
  • operation support
  • system effectiveness
Open Access

Impact of Airfield Concrete Pavements Deterioration Level on the Safety of Air Operations

Published Online: 31 Dec 2018
Page range: 123 - 142

Abstract

Abstract

The essential factor, which affects the safety of air operations, is the proper airport management based on systemically acquired information regarding the condition of the pavement surfaces of their functional elements. One of the elements in evaluating an airfield pavement technical condition is the assessment of their deterioration degree. This paper contains an extract from a broad study aimed at developing an index characterizing the deterioration degree of cement concrete airfield pavements, based on the results of visual inspections of damage and repairs, and their stock-taking based on a catalogue of common damage and the defined damage and repair quantity surveying principles.

Keywords

  • airfield pavement
  • deterioration
  • safety
  • air operations
Open Access

Evolution of Data Exchange in on-Board Vehicles Systems

Published Online: 31 Dec 2018
Page range: 143 - 154

Abstract

Abstract

On-board data exchange systems evolve with the development of vehicles. These are specialized constructions created from scratch to meet the specific tasks of modern control systems. The article presents the basic milestones in the evolution of telecommunications buses in vehicles from the beginning of their creation to the present day with the identification of areas that are the starting point in new directions of their development.

Keywords

  • CAN bus
  • FlexRay
  • LIN
Open Access

The Maintenance Scheduling Issues of Railway Traffic Control Systems with Respect to Reliability

Published Online: 31 Dec 2018
Page range: 155 - 183

Abstract

Abstract

Railway traffic control is based on specialized devices that are designed to exclude collision runs that may lead to loss of safety. A research issue arises in the context of determining effective maintenance intervals and the manner of conducting a technical service policy for existing devices. The aim of the article is to determine the structure of reliability research of selected railway traffic control devices in the aspect of device structure, the current strategy and the state of knowledge on service strategies. The article describes railway traffic control devices to discuss the issue of scheduling technical maintenance of this type of system.

Keywords

  • railway traffic control
  • CBM
  • RCM
9 Articles
Open Access

Lightness Factors and Exertion Factors Related to its Own Mass of Fiber Reinforced Plastics (FRP) Applied in Composite Aeronautical Structures (Part 1)

Published Online: 31 Dec 2018
Page range: 5 - 22

Abstract

Abstract

The paper concerns an application of lightness factors in comparative analysis of strength properties of basic materials being applied in aeronautical structures – in a historical perspective. The use of lightness factors enables effective estimation how lighter will be the structural elements (of the same strength or stiffness) made from different kind of materials : traditional as well as advanced composites. It is quite easy to find the solution to the inverse problem, i.e. to estimate how differ will be stiffness or strength for the same mass of the structural elements. Very particular application of the lightness factors are noted in engineers calculations of composite gliders wing spars, where they appears as the materials constants and as structure loading factors as well. The paper presents some examples of application of the lightness factors in strength analysis of the composite shells applied in the shear webs of the wing spars, and refers to the design recommendations issued by German aviation authority (LBA).

Keywords

  • aircraft
  • composites
Open Access

Lightness Factors and Exertion Factors Related to its Own Mass of Fiber Reinforced Plastics (FRP) Applied in Composite Aeronautical Structures (Part 2)

Published Online: 31 Dec 2018
Page range: 23 - 43

Abstract

Abstract

The paper concerns an application of lightness factors in comparative analysis of strength properties of basic materials being applied in aeronautical structures – in a historical perspective. The use of lightness factors enables effective estimation how lighter will be the structural elements (of the same strength or stiffness) made from different kind of materials : traditional as well as advanced composites. It is quite easy to find the solution to the inverse problem, i.e. to estimate how differ will be stiffness or strength for the same mass of the structural elements. Very particular application of the lightness factors are noted in engineers calculations of composite gliders wing spars, where they appears as the materials constants and as structure loading factors as well. The paper presents some examples of application of the lightness factors in strength analysis of the composite shells applied in the shear webs of the wing spars, and refers to the design recommendations issued by German aviation authority (LBA).

Keywords

  • aircraft
  • composites
Open Access

Analysis of Selected Reliability Indicators of Water Supply Network

Published Online: 31 Dec 2018
Page range: 45 - 65

Abstract

Abstract

The operation of the water supply network is related to ensuring the reliability of water supply to each customer. The reliability analysis of water supply can be based on reliability indicators of renewable objects such as water pipes. These indicators take into account the characteristics of the system and its components, by function or numerical characteristics. An example of reliability analysis for main and distribution pipes was made. The average renewal time, the average working time without failure and the reliability of network operation were determined.

Keywords

  • water supply network
  • reliability
  • reliability indicators
Open Access

Quality Analysis of Water Network Failure

Published Online: 31 Dec 2018
Page range: 67 - 85

Abstract

Abstract

The main objective of the study was to analyse and assess the failure rate of the water supply system of a provincial city located in south-eastern Poland. In the analysis the exploitation data provided by the water supply company were used. The received data include, among others, material structure, age of water supply network and failure log. The failure rate analysis of the water supply network was based on the failure rate index λ [failure/(km∙year)]. Based on the performed analysis, it was found that the water company should consider renovating or replacing steel pipes.

Keywords

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

Analysis and Testing of Reliability of Military Vehicles

Published Online: 31 Dec 2018
Page range: 87 - 103

Abstract

Abstract

The subjects of this publication are the issue of reliability studies of military vehicles, the determination of reliability indicators of selected groups of vehicles, and the adoption of complex models of operation for analysis based on recorded operational events. Numerical simulations of operating states were performed to verify the models and the adopted reliability indicators. It has been shown that it is possible to use the obtained results of research in the economic efficiency-oriented military vehicle management system in order to minimize structural surpluses and increase the efficiency of the land technology equipment park.

Keywords

  • vehicle
  • operation
  • model
Open Access

Analysis and Testing of Reliability Information Systems in Analysis of the Operation-Related Process in the Army

Published Online: 31 Dec 2018
Page range: 105 - 122

Abstract

Abstract

This paper focuses on the determination of effectiveness of the implemented system ZWSI RON in an analysis of the vehicles operation process in the army. With this end in view, a questionnaire-based diagnostic survey was conducted on staff members of the technical services of the Polish Army logistics units. The survey research results analysis shows that 90% of the respondents do not use the basic PM (Plant Maintenance) module of the ZWSI RON system to manage the operation of military vehicles. One should consider a modification of the mentioned system, i.e. creating new modules and new relations between individual modules of the system, using SAP system structure solutions.

Keywords

  • information system
  • operation support
  • system effectiveness
Open Access

Impact of Airfield Concrete Pavements Deterioration Level on the Safety of Air Operations

Published Online: 31 Dec 2018
Page range: 123 - 142

Abstract

Abstract

The essential factor, which affects the safety of air operations, is the proper airport management based on systemically acquired information regarding the condition of the pavement surfaces of their functional elements. One of the elements in evaluating an airfield pavement technical condition is the assessment of their deterioration degree. This paper contains an extract from a broad study aimed at developing an index characterizing the deterioration degree of cement concrete airfield pavements, based on the results of visual inspections of damage and repairs, and their stock-taking based on a catalogue of common damage and the defined damage and repair quantity surveying principles.

Keywords

  • airfield pavement
  • deterioration
  • safety
  • air operations
Open Access

Evolution of Data Exchange in on-Board Vehicles Systems

Published Online: 31 Dec 2018
Page range: 143 - 154

Abstract

Abstract

On-board data exchange systems evolve with the development of vehicles. These are specialized constructions created from scratch to meet the specific tasks of modern control systems. The article presents the basic milestones in the evolution of telecommunications buses in vehicles from the beginning of their creation to the present day with the identification of areas that are the starting point in new directions of their development.

Keywords

  • CAN bus
  • FlexRay
  • LIN
Open Access

The Maintenance Scheduling Issues of Railway Traffic Control Systems with Respect to Reliability

Published Online: 31 Dec 2018
Page range: 155 - 183

Abstract

Abstract

Railway traffic control is based on specialized devices that are designed to exclude collision runs that may lead to loss of safety. A research issue arises in the context of determining effective maintenance intervals and the manner of conducting a technical service policy for existing devices. The aim of the article is to determine the structure of reliability research of selected railway traffic control devices in the aspect of device structure, the current strategy and the state of knowledge on service strategies. The article describes railway traffic control devices to discuss the issue of scheduling technical maintenance of this type of system.

Keywords

  • railway traffic control
  • CBM
  • RCM

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