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Usage of short time Fourier transform in identification of vehicle shock absorber technical conditions researched by force vibration method

Author(s): Łukasz KONIECZNY | Rafał BURDZIK | Bogusław ŚLEZIAK

Journal: Transport Problems : an International Scientific Journal
ISSN 1896-0596

Volume: 4;
Issue: 3 part 1;
Start page: 71;
Date: 2009;
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Keywords: force vibration method | short time Fourier transform | vibro-acoustic signal analysis

The paper presents results of vibro-acoustic signal analysis (acceleration of the unsprung mass of passenger’s car suspension actuated to vibration by harmonic, kinematic vibration). The range of research has included front shock absorber for Fiat Seicento with simulated fault (oil leak). Force process consisted of three phases: increase of frequency, vibration with constant frequency (above 21 Hz) and decreases of frequency.For the analysis process Short Time Fourier Transform method was used with superposition of rectangles window and with zero complement method. On STFT spectrum resonance frequency of unsprung mass was identified. The estimator was the means of maximum acceleration amplitude peak in frequency band round resonance frequency. The result of investigation was presented on diagrams with changeable value of estimator for different technical conditions of shock absorber (with different volume of oil inside the shock absorber)
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