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Abstract: The fundamental relation between structural vibration and
acoustic radiation is discussed based on the theory of structure
vibration modal analysis. An experiment is used for verification. The
result of examination and analysis shows that frequencies of the peak
value in sound signal power spectra are consistent with the structure
modal frequencies. A new approach is presented for feature extraction
from sound signals generated by the structure sound radiation in
frequency domain using modal frequency. The approach was used to
identify the loading pattern classification on the specific machine
structure. The research result clearly expresses that the approach is
reliable and effective for loading pattern classification. The approach
is very useful for application on machinery operating state inspecting
and fault diagnosis, because that the obtaining of the sound signal is
easy and the cost is low as well as the method of measurement does not
touching.
Key words: Modal analysis Vibration acoustic transfer characteristic
Lane stacker structural Sound radiation signal Feature
extraction Loading pattern classification
CLC No: TB535
国家自然科学基金(50335030,
50405043)和山西省自然科学基金(20041045)资助项目.
Received 20040920, received in revised form 20050118
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