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中文摘要：
钣金件是机械产品结构中重要的组成部件,属于轻质量薄壁件,常用作框架的蒙皮或连接.在工程应用中,钣金件常因外部激励而产生振动和噪声辐射.针对传统模态试验中传感器的附加质量对薄壁件影响较大,采用了非接触激光测振技术.简单介绍了模态测试理论与多普勒激光测振原理,给出了试验模态流程和方法.采用单点激振多点拾振（SIMO）的方法,得到钣金件自由状态下的低阶固有频率和振型.试验结果显示,钣金件一阶固有频率为131.25Hz,高于外部激振频率,不会产生共振现象,有着较好的动力学特性.
英文摘要：
Sheet metal parts are important components in mechanical product structure. Sheet metal parts often produce vibration and noise radiation because of external excitation. The additional quality of sensor may have big effect on thin wall parts in traditional modal experiment. So, it uses non-contact laser vibration measurement technique. Experimental modal process and method are giver The low order natural frequencies and vibration mode of sheet metal parts in free condition are obtained in the way of Single-Input and Multi-Output （SIMO）. The experimental results show that first-order natural frequeucy is 131.25Hz, and the frequency is higher than external excitation frequency. The resonance phenomenon would not occur.
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