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经典SANDWICH梁弯曲共振法测量理论由于忽略了SANDWICH试件弹性层阻尼的影响,给阻尼材料动态力学参数测量结果引入了误差。该文首先基于约束阻尼结构弯曲共振模型,推导了考虑弹性层阻尼影响的SANDWICH 梁弯曲共振法测量方程;然后分别基于经典方程及改进方程对同一试件的测量数据进行了处理,并通过对结果的比较,分析了由于忽略弹性层阻尼而给测量结果造成的影响。研究表明:忽略弹性层阻尼影响对阻尼材料损耗因子的测量精度影响更显著,并且损耗因子的测量误差对弹性层阻尼的变化也更敏感。忽略弹性层阻尼影响还会导致由无效的测量数据得到看似合理的材料参数测量结果,从而误导阻尼减振降噪结构的设计。文中研究内容为SANDWICH试件弹性层材料的选择及测量结果的评估提供了理论依据, 对提高SANDWICH梁弯曲共振法测量精度及阻尼技术的有效应用具有重要意义。
The classic SANDWICH beam bending resonance measurement theory has neglected the effect of elastic layer damping of SANDWICH specimen, and introduced the error into the measurement results of dynamic mechanical parameters of damping material. Based on the bending resonance model of the constrained damped structure, the SANDWICH beam bending resonance measurement equation considering the damping of the elastic layer is deduced. Then, the measurement data of the same test piece are processed based on the classical equation and the improved equation respectively. The impact of the omission of the elastic layer damping on the measurement results is analyzed. The results show that ignoring the effect of damping on the elastic layer has a more significant influence on the measurement accuracy of the damping loss factor, and the measurement error of the dissipation factor is also more sensitive to the damping of the elastic layer. Neglecting the damping effect of the elastic layer will also lead to the seemingly reasonable measurement of the material parameters from the invalid measurement data, thus leading to the design of the damping vibration damping structure. The contents of this paper provide a theoretical basis for the selection of SANDWICH specimen elastic layer material and evaluation of measurement results, and are of great significance to improve the measurement accuracy of SANDWICH beam bending resonance method and the effective application of damping technology.