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Journal Details
Format
Journal
eISSN
2083-4608
ISSN
1895-8281
First Published
26 Feb 2008
Publication timeframe
4 times per year
Languages
English

Search

Volume 3 (2007): Issue 2007 (January 2007)

Journal Details
Format
Journal
eISSN
2083-4608
ISSN
1895-8281
First Published
26 Feb 2008
Publication timeframe
4 times per year
Languages
English

Search

6 Articles
Open Access

The Exploitation of Wavelet De-Noising To Detect Bearing Faults

Published Online: 26 Feb 2008
Page range: 7 - 16

Abstract

The Exploitation of Wavelet De-Noising To Detect Bearing Faults

Failure diagnosis is an important component of the Condition Based Maintenance (CBM) activities for most engineering systems. Rolling element bearings are the most common cause of rotating machinery failure. The existence of the amplitude modulation and noises in the faulty bearing vibration signal present challenges to effective fault detection method. The wavelet transform has been widely used in signal de-noising due to its extraordinary time-frequency representation capability. In this paper, we proposed new approach for bearing fault detection based on the autocorrelation of wavelet de-noised vibration signal through a wavelet base function derived from the bearing impulse response. To improve the fault detection process the wavelet parameters (damping factor and center frequency) are optimized using maximization kurtosis criteria to produce wavelet base function with high similarity with the impulses generated by bearing defects, that leads to increase the magnitude of the wavelet coefficients related to the fault impulses and enhance the fault detection process. The results show the effectiveness of the proposed technique to reveal the bearing fault impulses and its periodicity for both simulated and real rolling bearing vibration signals.

Keywords

  • Kurtosis maximization
  • wavelet de-noising
  • autocorrelation
  • Bearing fault detection
  • impulse-response wavelet
  • safety
  • dependability
  • technical object
  • decisionmaking support
  • engineering
Open Access

Determination of the Risk Function for Survivors Using Beta Pert Method

Published Online: 26 Feb 2008
Page range: 17 - 26

Abstract

Determination of the Risk Function for Survivors Using Beta Pert Method

In emergency at sea the most important is to start the rescue action as fast as possible, whereas the decision to terminate the action, in case the survivors have not been found, is made by the coordinator on the basis of his practical experience. To estimate the level of risk it is necessary to face the problem of lack of credible statistical data. The paper presents a new concept which allow to calculate the risk, taking into account data uncertainty. The method and probability model are presented and discussed.

Keywords

  • Search and Rescue at sea
  • risk
  • Beta Pert method
Open Access

Prediction the Bearing Reliability on Basis Diagnostic Information

Published Online: 26 Feb 2008
Page range: 27 - 49

Abstract

Prediction the Bearing Reliability on Basis Diagnostic Information

The new complex method of diagnostics of helicopter's turbine engine Allison 250 in work was. This method be bases on complex diagnostic signals of resulting with simultaneous use three autonomic methods of diagnosing (functional diagnosing, wibroacustic diagnosing and tribologic diagnosing) and of surroundings described with number of crossings of diagnostic sill timbers of these signals. This way of description permits to establish between diagnostic signals quantitative reports and the surroundings and the state of technical object. It the diagnostics was conducted of arrangement bearings two engines Allison 250 built-up on helicopter PZL - KANIA. It was showed, that captured in this way diagnostic signals can be used to prediction of reliability profiles of arrangement bearings.

Keywords

  • turbine engine
  • diagnostic
  • reliability
Open Access

One Piece Production Principle Masters Global Market Challenges

Published Online: 26 Feb 2008
Page range: 51 - 62

Abstract

One Piece Production Principle Masters Global Market Challenges

Successful companies in global markets must be innovative in product development and able to produce their products at lowest possible total cost, while highest quality and product availability in the markets is self evident. They must be able to manage violent market demand- and product design-changes with flexible and agile manufacturing systems [1]. These challenges ask, in the first place, for new strategies in the field of designing appropriate process technologies, production process structures and, as we will show, new methods and considerations for planning and controlling the sequence of product variants within production programs.

Keywords

  • product development
  • product availability
  • decision- making support
  • engineering
Open Access

Relations Between Safety and Security in Technical Systems

Published Online: 26 Feb 2008
Page range: 63 - 73

Abstract

Relations Between Safety and Security in Technical Systems

The subject of this paper deals with the relationship between safety and security of the man - machine system. In the above system a man can act both as a decision - maker and operator. His desired psychophysical efficiency lies in the undertaking the correct decisions as well as in the skilful machine control and operating.

Keywords

  • safety
  • reliability
  • technical systems
Open Access

Integrated System to Aid Supervisory Process of Technical Device

Published Online: 26 Feb 2008
Page range: 75 - 90

Abstract

Integrated System to Aid Supervisory Process of Technical Device

The aim of the paper is integrated system to aid supervisory process of technical device taking into consideration required level of exploitation safety and dependability. Preservation of accepted technical state of the machines and devices requires from users proper decisions which are results of continuous as well as periodically monitoring exploitation parameters' changes. Essential problem is digital drawing and conversion information from process of object exploitation and creating multi-access databases.

Keywords

  • safety
  • dependability
  • technical object
  • decision- making support
  • engineering
6 Articles
Open Access

The Exploitation of Wavelet De-Noising To Detect Bearing Faults

Published Online: 26 Feb 2008
Page range: 7 - 16

Abstract

The Exploitation of Wavelet De-Noising To Detect Bearing Faults

Failure diagnosis is an important component of the Condition Based Maintenance (CBM) activities for most engineering systems. Rolling element bearings are the most common cause of rotating machinery failure. The existence of the amplitude modulation and noises in the faulty bearing vibration signal present challenges to effective fault detection method. The wavelet transform has been widely used in signal de-noising due to its extraordinary time-frequency representation capability. In this paper, we proposed new approach for bearing fault detection based on the autocorrelation of wavelet de-noised vibration signal through a wavelet base function derived from the bearing impulse response. To improve the fault detection process the wavelet parameters (damping factor and center frequency) are optimized using maximization kurtosis criteria to produce wavelet base function with high similarity with the impulses generated by bearing defects, that leads to increase the magnitude of the wavelet coefficients related to the fault impulses and enhance the fault detection process. The results show the effectiveness of the proposed technique to reveal the bearing fault impulses and its periodicity for both simulated and real rolling bearing vibration signals.

Keywords

  • Kurtosis maximization
  • wavelet de-noising
  • autocorrelation
  • Bearing fault detection
  • impulse-response wavelet
  • safety
  • dependability
  • technical object
  • decisionmaking support
  • engineering
Open Access

Determination of the Risk Function for Survivors Using Beta Pert Method

Published Online: 26 Feb 2008
Page range: 17 - 26

Abstract

Determination of the Risk Function for Survivors Using Beta Pert Method

In emergency at sea the most important is to start the rescue action as fast as possible, whereas the decision to terminate the action, in case the survivors have not been found, is made by the coordinator on the basis of his practical experience. To estimate the level of risk it is necessary to face the problem of lack of credible statistical data. The paper presents a new concept which allow to calculate the risk, taking into account data uncertainty. The method and probability model are presented and discussed.

Keywords

  • Search and Rescue at sea
  • risk
  • Beta Pert method
Open Access

Prediction the Bearing Reliability on Basis Diagnostic Information

Published Online: 26 Feb 2008
Page range: 27 - 49

Abstract

Prediction the Bearing Reliability on Basis Diagnostic Information

The new complex method of diagnostics of helicopter's turbine engine Allison 250 in work was. This method be bases on complex diagnostic signals of resulting with simultaneous use three autonomic methods of diagnosing (functional diagnosing, wibroacustic diagnosing and tribologic diagnosing) and of surroundings described with number of crossings of diagnostic sill timbers of these signals. This way of description permits to establish between diagnostic signals quantitative reports and the surroundings and the state of technical object. It the diagnostics was conducted of arrangement bearings two engines Allison 250 built-up on helicopter PZL - KANIA. It was showed, that captured in this way diagnostic signals can be used to prediction of reliability profiles of arrangement bearings.

Keywords

  • turbine engine
  • diagnostic
  • reliability
Open Access

One Piece Production Principle Masters Global Market Challenges

Published Online: 26 Feb 2008
Page range: 51 - 62

Abstract

One Piece Production Principle Masters Global Market Challenges

Successful companies in global markets must be innovative in product development and able to produce their products at lowest possible total cost, while highest quality and product availability in the markets is self evident. They must be able to manage violent market demand- and product design-changes with flexible and agile manufacturing systems [1]. These challenges ask, in the first place, for new strategies in the field of designing appropriate process technologies, production process structures and, as we will show, new methods and considerations for planning and controlling the sequence of product variants within production programs.

Keywords

  • product development
  • product availability
  • decision- making support
  • engineering
Open Access

Relations Between Safety and Security in Technical Systems

Published Online: 26 Feb 2008
Page range: 63 - 73

Abstract

Relations Between Safety and Security in Technical Systems

The subject of this paper deals with the relationship between safety and security of the man - machine system. In the above system a man can act both as a decision - maker and operator. His desired psychophysical efficiency lies in the undertaking the correct decisions as well as in the skilful machine control and operating.

Keywords

  • safety
  • reliability
  • technical systems
Open Access

Integrated System to Aid Supervisory Process of Technical Device

Published Online: 26 Feb 2008
Page range: 75 - 90

Abstract

Integrated System to Aid Supervisory Process of Technical Device

The aim of the paper is integrated system to aid supervisory process of technical device taking into consideration required level of exploitation safety and dependability. Preservation of accepted technical state of the machines and devices requires from users proper decisions which are results of continuous as well as periodically monitoring exploitation parameters' changes. Essential problem is digital drawing and conversion information from process of object exploitation and creating multi-access databases.

Keywords

  • safety
  • dependability
  • technical object
  • decision- making support
  • engineering

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