在识别模态阻尼比方面，本文还对传统的半功率带宽法作了改进，阻尼识别精度得到很大提高。
At identify the model damping, this text returning rightly tradition take the breadth method to make improvement, make the accuracy to get very big exaltation.
本文设计了一种多谐振腔宽带换能器，采用径向极化的压电陶瓷圆管作为激励源，激发多个液腔的振动，以多模态耦合振动的方式来拓展带宽。
Multi-resonator broadband transducer is given in this paper. The transducer driven by radially poled piezoelectric cylinder achieves broadband transmission by coupling multiple fluid vibrations modes.
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