CAJ | 학술논문

在黏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，对黏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：利用该测试方法，通过较少次数测试可得到与黏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。
재점탄성세봉역학삼수공진법측량적기출상제출료일충관빈측시방법。격진기산생료파형가공적관빈단맥충신호，대점탄성세봉진행종향격려。이용격광측진의분별측량격진기화세봉자유단적진동속도향응，통과자유단여격진단향응신호재관빈범위적폭치비화상위차，근거공진법원리가해산공진빈솔처적저능모량화손모인자。령외，대측시과정진행료유한원방진。결과표명：이용해측시방법，통과교소차수측시가득도여점탄의수거문합적동역학삼수，이유한원분석가대측시제공지도。
A broadband method to identify the dynamic parameters of viscoelastic bar using resonance measurement under pulse excitation was presented.Controllable broadband pulses were generated by an exciter and used to produce the longitudinal vibration of a viscoelastic thin bar.The vibration velocities at the free end of the bar and the exciter were measured respectively by a laser vibrometer.The velocity ratio can be obtained over a wide frequency range and thus,the storage modulus and the loss factor can be determined at resonant frequencies.Moreover,the testing process was simulated by finite element calculation.The proposed method is demonstrated valid and accurate by comparing the parameters obtained with the results of the viscoelastic apparatus test.