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中文摘要：
采用多参考最小二乘复频法对具有相同结构的AZ91D镁合金试件和A380铝合金试件进行模态参数识别。在同等激励脉冲输入条件下进行2种材料时域激励响应特征的多特征点对比测试，比较AZ91D镁合金替换A380铝合金前后试件结构动力学性能的差异，通过整体频响函数和激励响应特性对AZ91D镁合金阻尼减振的工程实际效果进行评价。结果表明：在几何结构相同的情况下，2种材料的固有频率和固有振型模态参数相似，AZ91D镁合金试件具有更好的模态阻尼比。但由于镁合金材料刚性较低，仅通过直接的材料替换，镁合金材料的高阻尼减振性难以在实际工程中得到有效表现。
英文摘要：
The modal parameter identification was contrastively carried out to test the components of AZ91D magnesium alloy and A380 aluminum alloy with the same structure. The structural dynamics properties of the test pieces were researched by modal parameter identification based on the LMS PolyMax method, and the vibration damping capacity of AZ91D magnesium alloy was evaluated by frequency response function and further investigated by vibration response testing at several characteristic points on the test pieces. The results show that the two kind materials with the same geometry structure have the similar natural frequency and principle mode, and the test pieces of AZ91D Mg alloy have higher modal damping ratios. However, the outstanding vibration damping capacity of magnesium alloys can not be exhibited only by material replacement rather than structural redesign because of the lower stiffness of magnesium alloys.
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