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| Research of Extraction Method for Unbalance Signal in High Precision Dynamic Balancing Measurement |
| li chuan-jiang,fei min-rui,zhang zi-qiang |
| college of Information,Mechanical and Electrical Engineering,Shanghai 201418,China;School of Mechanical Engineering & Automaion,Shanghai 200072,China |
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Abstract Abstract:
Beat wave probably appears in vibration signal when unbalance is small. An estimation of beat frequency period and extraction of unbalance using sine approximation method is proposed in this paper. Period of beat frequency is estimated based on frequency composition of FFT result. Then, sine approximation method is used in extraction of unbalance amplitude and phase based on vibration data in a whole beat period. Simulation and experiments shows that this method solves unsteadiness of measuring result when unbalance is small, so the measurement precision is improved.
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Received: 30 March 2011
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2012, Vol. 31 
