悬臂梁弯曲共振法测量粘弹性阻尼材料力学参数的实验中常以双边附加自由结构阻尼试件为实验对象。实验中试件设计的合理程度直接影响实验的测试精度。为了指导试件设计，通过灵敏度分析提出了影响系数的概念，并将其应用于分析试件的厚度比、共振频率比、密度比、损耗因子等参数的测量误差对粘弹性材料力学参数测试精度的影响中，进而对试件的设计提出一些有重要意义的技术规范。最后，基于悬臂梁弯曲共振法获取粘弹性材料力学参数的实验，分析了双边自由阻尼结构试件的适用范围。%The specimens with supplemental structural damping at both sides are frequently used in measurement of viscoelastic material's mechanical parameters with the flexurally resonating cantilever beam method (FRCBM). Appropriate design of specimens decides the accuracy of experimental results.Through sensitivity analysis,the concept of influencial coefficients was proposed and used in the analysis of experimental results affected by the measurement accuracy of thickness ratio,resonance frequency ratio,density ratio and loss factor of the specimen.Some significant technical specifications were presented to help the design of specimens.The applicability of the specimens with both sides damped used in the measurement of mechanical parameters with FRCBM was discussed.
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