Modal analysis of low-level-light aiming sight-glass based on vibration testing conditions

2009 ◽  
Author(s):  
Youtang Gao ◽  
Si Tian ◽  
Jianliang Qiao ◽  
Jun Niu ◽  
Benkang Chang
Keyword(s):  
Modal Analysis ◽  
Vibration Testing ◽  
Testing Conditions ◽  
Low Level

Modal analysis of low-level-light aiming sight-glass based on shock testing conditions

2010 ◽  
Author(s):  
Youtang Gao ◽  
Huan Ding ◽  
Xiao Xue ◽  
Yuan Xu ◽  
Benkang Chang
Keyword(s):  
Modal Analysis ◽  
Testing Conditions ◽  
Low Level ◽  
Shock Testing

Vibration Testing and Modal Analysis of Airplanes – Recent Advances

2004 ◽  
Author(s):  
Bart Peeters ◽  
Antonio Vecchio ◽  
Thierry Olbrechts ◽  
Herman Van der Auweraer ◽  
Filip Lambert
Keyword(s):  
Modal Analysis ◽  
Vibration Testing ◽  
Recent Advances

scholarly journals Operational modal analysis of mechanical systems using transmissibility functions in the presence of harmonics

2019 ◽  
Vol 13 (3) ◽  
pp. 1-14
Author(s):  
Van Dong Do ◽  
Thien Phu Le ◽  
Alexis Beakou
Keyword(s):  
White Noise ◽  
Modal Analysis ◽  
Gaussian White Noise ◽  
Harmonic Component ◽  
Operational Modal Analysis ◽  
Ambient Vibration ◽  
Response Analysis ◽  
Vibration Testing ◽  
Engineering Structures ◽  
Ambient Vibration Testing

Ambient vibration testing is a preferred technique for heath monitoring of civil engineering structures because of several advantages such as simple equipment, low cost, continuous use and real boundary conditions. However, the excitation not controlled and not measured, is always assumed as Gaussian white noise in the processing of ambient responses called operational modal analysis. In presence of harmonics due to rotating parts of machines or equipment inside the structures, e.g., fans or air-conditioners…, the white noise assumption is not verified and the response analysis becomes difficult and it can even lead to biased results. Recently, transmissibility function has been proposed for the operational modal analysis. Known as independent of excitation nature in the neighborhood of a system's pole, the transmissibility function is thus applicable in presence of harmonics. This study proposes therefore to apply the transmissibility functions for modal identification of ambient vibration testing and investigates its performance in presence of harmonics. Numerical examples and an experimental test are used for illustration and validation. Keywords: operational modal analysis; transmissibility function; harmonic component; ambient vibration testing.

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