A Review of Acoustic Emission Technique for Machinery Condition Monitoring: Defects Detection & Diagnostic

2012 ◽  
Vol 229-231 ◽  
pp. 1476-1480 ◽  
Author(s):  
Salah M. Ali Al-Obaidi ◽  
M. Salman Leong ◽  
R.I. Raja Hamzah ◽  
Ahmed M. Abdelrhman
Keyword(s):  
Acoustic Emission ◽  
Condition Monitoring ◽  
State Of The Art ◽  
The State ◽  
Non Destructive Testing ◽  
Testing Methods ◽  
Acoustic Emission Technique ◽  
Destructive Testing ◽  
Machinery Condition Monitoring ◽  
Non Destructive

Acoustic emission (AE) measurements are one of many non-destructive testing methods which had found applications in defects detection in machines. This paper reviews the state of the art in AE based condition monitoring with particular emphasis on rotating and reciprocating machinery applications. Advantages and limitations of the AE technique in comparison to other condition monitoring techniques in detecting common machinery faults are also discussed.

A Preliminary Study of Piezoelectric Vibration Energy Harvester for Vibration Condition Monitoring Applications of Rotating Machinery

2008 ◽  
Author(s):  
Kazuhiko Adachi ◽  
Tohru Tanaka
Keyword(s):  
Condition Monitoring ◽  
Energy Harvester ◽  
Fiber Composite ◽  
Rotating Machinery ◽  
Industrial Plant ◽  
Vibration Energy ◽  
Production Plant ◽  
Vibration Energy Harvester ◽  
Vibration Condition ◽  
Monitoring Applications

Rotating machinery is widely used in the industrial plant, for example, power plant, chemical plant, mass-production plant and so on. In order to ensure safety operation of the rotating machinery, vibration condition monitoring of the machinery can play a crucial role. In this study, the cantilever type of vibration energy harvester is designed for vibration condition monitoring applications of rotating machinery. The mechanical resonant frequency of piezoelectric bimorph cantilever will be tuned to the rotating speed of the machinery. Recently, new d31 type Macro-Fiber Composite (MFC) can be commercially available. Due to the d31 configuration, electrical impedance of new MFC is much smaller than that of previous d33 type MFC. This study experimentally compares the ability two types of MFC, d31 and d33 configurations, to generate electrical energy when subjected to mechanical vibration.

A New Cepstral Analysis Procedure of Recovering Excitations for Transient Components of Vibration Signals and Applications to Rotating Machinery Condition Monitoring

2001 ◽  
Vol 123 (2) ◽  
pp. 222-229 ◽  
Author(s):  
G. T. Zheng ◽  
W. J. Wang
Keyword(s):  
Condition Monitoring ◽  
Rotating Machinery ◽  
Analysis Procedure ◽  
Transient Signal ◽  
Rotor Vibration ◽  
Vibration Signals ◽  
Machinery Condition Monitoring ◽  
Cepstral Analysis ◽  
Cepstrum Analysis ◽  
Complex Cepstrum

A new cepstral analysis procedure with the complex cepstrum for recovering excitations causing multiple transient signal components from vibration signals, especially from rotor vibration signals, has been developed. Along with the problem of singularity, a major problem of the cepstrum is that it cannot provide a correct distribution of the excitations. To solve these problems, a signal preprocessing method, whose function is to provide a definition for the distribution of the excitations along the quefrency axis and remove singular points from the transform, has been added to the cepstrum analysis. With this procedure, a correct distribution of the excitations can be obtained. An example of application to the condition monitoring of rotor machinery is also presented.

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