悬臂薄板结构阻尼特性几种测试方法的比较

在振动和噪声控制中,阻尼的测试有着重要的工程及学术意义.在明确阻尼辨识原理的基础上,以悬臂薄板结构为研究对象,搭建了锤击、振动台、压电陶瓷激励三种测试系统,分别采用半功率带宽法和时域自由振动衰减法进行了阻尼测试.并从重复性、测试精度、测试阻尼的频率范围和测试效率等方面,将各种阻尼测试结果进行了比较.最终认为,宜采用振动台扫频激励的方式和半功率带宽法对所研究的薄板进行阻尼测试和辨识.可为悬臂薄板结构后续的响应预估和阻尼优化设计提供重要的参考.

Comparative study on testing methods for damping property of cantilever thin-plate structures

During the vibration and noise control, the damping test secures a crucial role in engineering and academic areas. Based on the damping identification principles, three testing systems regarding the hammer, vibration table and piezoelectric ceramic exciter are first set up for cantilever thin-plate structures. By respectively applying the half-power bandwidth and time-domain free vibration attenuation methods for damping tests, the damping test results are then compared in terms of repetitiveness, testing precision, damping frequency range and testing efficiency. Finally, it is implied that the frequencysweeping excitation via vibration table and half-power bandwidth methods are suitably employed for damping test and identification. Therefore, this approach provides a critical reference to the following response predcti and damping optimization design on cantilever thin-plate structures.