Dynamic and acoustic response of a clamped rectangular plate in thermal environments: experiment and numerical simulation.
Dynamic and acoustic response of a clamped rectangular plate in thermal environments: experiment and numerical simulation.
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DOI：
10.1121/1.4870483
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发表时间：
2014-05
期刊：
影响因子：
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通讯作者：
Q. Geng;Huan Li;Yueming Li
中科院分区：
文献类型：
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作者：
Q. Geng;Huan Li;Yueming Li
对热环境下固支矩形铝板的振动和声学响应特性进行了实验研究。通过模态试验研究了热环境对结构自振特性的影响。随着结构温度的升高，板的固有频率明显降低。观察到的模式的频率非常接近彼此的模式形状互换。热致软化效应对板沿着两个面内方向的影响是不相等的。数值方法也被用来研究实验现象。计算结果表明，初始挠度对加热板的固有振动有很大的影响。即使是微小的曲率也可以明显降低热致软化效应。在声激励和机械激励下进行了动态响应测试，测量结果表明，阻尼的变化决定了在共振峰的响应幅度在测试。
Experiments were performed to investigate the vibration and acoustic response characteristics of a clamped rectangular aluminum plate in thermal environments. Modal tests were carried out to study the influence of thermal environment on natural vibration. With the increment of structural temperature, natural frequencies of the plate decrease obviously. Mode shape interchange was observed for the modes with frequencies very close to each other. The thermally induced softening effect has unequal influences on the plate along the two in-plane directions. Numerical methods were also employed to study the experimental phenomena. Calculated results indicated that the initial deflection has a great influence on the natural vibration of the heated plate. Even a slight curvature can reduce the thermally induced softening effect obviously. Dynamic response tests were carried out under acoustic and mechanical excitations, and the measured results indicate that the variation in damping determines the response amplitudes at resonant peaks in the test.