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Abstract: A series of the tests on squeal formation are carried out
using a flat specimen rubbed against a ball specimen. The sound pressure
level of squeal, 3-dimensional vibration accelerations of the specimen
and nominal friction force are recorded during testing, which probably
contain the messages on the cause to excite squeal. These signals are
decomposed and analyzed using the wavelet transform technique. In the
wavelet decomposing details, which correspond to the dominant frequency
of the nominal friction force and inertial force, the fluctuation of the
friction force is seen clearly. That demonstrates that squeal is caused
by a varying friction force.
Key words: Squeal Friction-induced vibration Excitation Wavelet
transform
CLC No: TH117.12
国家自然科学基金资助项目(50075072). Received 20020104, received in revised form
20020720
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