基于复合材料叶片的时域衰减信号,对其阻尼的不确定性进行测试研究.首先,组建复合材料叶片的阻尼测试系统,提出具体的阻尼不确定性测试流程,并通过"标准差"指标来量化表征某一阶阻尼的不确定性程度;然后,以三种不同类型的TC500碳纤维/树脂基复合材料直板叶片为研究对象,通过测试获取其在不同衰减时刻的阻尼结果,并证明其阻尼确实存在不确定性现象;最后,讨论激励幅度、边界条件、背景噪声对复合材料叶片某一阶阻尼不确定性的影响程度和影响规律,并提出采用线性平均法来准确获得其阻尼结果.%The damping uncertainty of composite blades is tested and studied using time-domain attenuation signals. First of all, the damping test system for composite blades is set up, and the test procedure of damping uncertainty is designed so that the uncertainty level of a certain-order damping can be quantified by the index of standard deviation. Then, with three different types of TC500 carbon fiber/resin composite straight-panel blades as the objects, their damping results at different attenuation time are obtained by the testing. And the damping uncertainty phenomenon is confirmed. Finally, the influence rules of exciting levels, boundary conditions and background noise levels on the damping uncertainty of the composite blades are discussed. Consequently, linear average technique is proposed to accurately obtain the final damping results.
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