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基于非接触式光学测振和有限元反演对黏弹材料复模量的测量进行了理论和实验研究。针对反演精度受测点选择影响显著的问题进行了误差分析,推导了灵敏度矩阵的计算公式;得到了反演误差的计算方法;找出了影响反演精度的主要误差来源;通过测点优化,提高了泊松比测试精度。利用温频等效原理,在常压、变温条件下对橡胶样品进行了温频等效测量,实验研究表明,该系统可以以较少的温度台阶获得材料主曲线,反演结果与动态机械分析仪(DMA)测试结果误差在10%以内,进一步印证了反演系统的有效性。
Based on the non-contact optical vibration measurement and finite element inversion, the theoretical and experimental studies on the measurement of the viscoelastic material’s complex modulus are carried out. Aiming at the problem that the inversion precision is affected by the choice of measuring point, the error analysis is carried out, the calculation formula of sensitivity matrix is deduced, the calculation method of inversion error is obtained, the main error sources which affect the accuracy of inversion are found out, , Improve the Poisson’s ratio test accuracy. According to the principle of temperature and frequency equivalence, the temperature and frequency of rubber samples were measured at atmospheric pressure and temperature. Experimental results show that the system can obtain the main curve of material with less temperature steps. The results of inversion and dynamic mechanical analysis Instrument (DMA) test results within 10% error, further confirms the validity of the inversion system.