On a frequency response curve,sometimes,there is a resonance peak splitting to two peaks when measuring damping coefficient of a composite specimen with the flexural resonance method,it is called the “Double-Peak” phenomenon.Here,the coupled vibration model of a cantilever beam specimen excited from different directions was established.The “Duble-Peak”curve was recovered through signals composition.It was shown that the “Double-Peak” phenomenon is caused due to interferences of the orthogonal flexural vibrating modes for the two peaks,one is the principal resonance peak,the other is the interfering peak.Based on this mechanism,the method to identify the principal resonance peak and the interfering peak by identifying the modulus of the damping layer was proposed.The effects of frequency,and amplitude,etc.of interference signals on the identification accuracy of the specimen′s loss factor were analyzed.The results showed that quite accurate results can be obtained with the flexural resonance method despite the existence of the interfering peak if the principal resonance peak can be identified.The study results provided a way to deal with the “Double-Peak” curve and data.
Key words
flexural resonance method /
resonance peak /
“Double-Peak” /
loss factor
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