Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第19卷    第1期    总第118期    2009年1月

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文章编号:1004-0609(2009)01-0044-06
AZ91D和A380合金模态参数识别和激励响应测试
张  力1,赵振奇1,张丁非2,汪先国3,黄新华1

(1. 重庆大学 机械工程学院,重庆 400030;
2. 重庆大学 国家镁合金材料工程技术研究中心,重庆 400030;
3. 重庆建设摩托车股份有限公司,重庆 400050
)

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。

 

关键字: 镁合金;阻尼特性;模态分析;振动响应

Modal parameter identification and vibration response testing of AZ91D and A380 alloys
ZHANG Li1, ZHAO Zhen-qi1, ZHANG Ding-fei2, WANG Xian-guo3, HUANG Xin-hua1

1. College of Mechanical Engineering, Chongqing University, Chongqing 400030, China;
2. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400030, China;
3. Chongqing Jianshe Motorcycle Co. Ltd., Chongqing 400050, China

Abstract: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.

 

Key words: magnesium alloy; damping capacity; modal analysis; vibration response

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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