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论文类型：期刊论文

发表时间：2017-08-01

发表刊物：SMART MATERIALS AND STRUCTURES

收录刊物：SCIE

卷号：26

期号：8

ISSN号：0964-1726

关键字：beat phenomenon; piezoelectric ceramic sensors; impact direction determination; free vibration

摘要：The beat phenomenon may be observed in a free vibration test with piezoceramic sensors. In contrast to exponential decay vibration, the beat signal is characterized as decreasing or increasing periodically. The beat phenomenon in the piezoelectric sensors is caused by the combination of signals of an oblique impact coming from two orthogonal directions of structures. An impact direction determination method based on the beat signal is proposed in this paper. The proposed method was verified through an impact test on a steel column specimen. The results showed that the proposed method can effectively identify the impact direction by using the envelope of the beat signal of the piezoelectric sensor.