在粘弹性细棒力学参数共振法测量的基础上提出了一种宽频测试方法。激振器产生了波形可控的宽频短脉冲信号，对粘弹性细棒进行纵向激励。利用激光测振仪分别测量激振器和细棒自由端的振动速度响应，通过自由端与激振端响应信号在宽频范围的幅值比和相位差，根据共振法原理可解算共振频率处的储能模量和损耗因子。另外，对测试过程进行了有限元仿真。结果表明：利用本文测试方法，通过较少次数测试可得到与粘弹仪数据吻合的动力学参数，而有限元分析可对测试提供指导。
Abstract
A broadband method to identify the dynamic parameters of viscoelastic bar using resonance measurement by pulse signal is presented. A controllable broadband pulse is generated by the exciter and is used to force the longitudinal vibration of a viscoelastic thin bar. The vibration velocities of the free end of the bar and the exciter are measured respectively by a laser vibrometer. The velocity ratio can be obtained over a wide frequency range. Thus, the storage modulus and the loss factor can be determined at resonant frequencies. Moreover, the testing process is simulated by finite element calculation. The proposed method is demonstrated valid and accurate by comparison with the viscoelastic apparatus test.
关键词
粘弹性细棒 /
有限元分析 /
宽频脉冲 /
力学参数
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Key words
viscoelastic thin bar /
finite element analysis /
broadband pulse /
dynamic parameters
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参考文献
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