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The local vibration modes due to impact on the edge of a viaduct

机译:由于影响高架桥边缘而产生的局部振动模式

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This paper describes the vibration responses of a cement viaduct model under impulsive force excitation. The frequencies and mode shapes of resonances can control magnitude of the structure-borne noise radiation. A steel hammer is used to excite the cement viaduct model at the centre and at the supporting edge position of the cross-section separately in order to acquire the vibration responses and mode shape data. From such data the global mode and local modes of the cement viaduct model are identified. It is shown that the edge of section supported by the web may have low impedance in the vertical direction. The results of analysis using a Finite Element Method confirmed the experimental findings of the cross-sectional modes of the cement viaduct model. The findings suggested that the vibrations of local modes are of two types: (1) Centre mode - the centre of top panel can move but the edge is fixed. (2) Edge (web) mode - the centre of panel is fixed but the edge (supported by web) can move.
机译:本文描述了在脉冲力激励下水泥高架桥模型的振动响应。共振的频率和模式形状可以控制固体声辐射的大小。为了获得振动响应和振型形状数据,使用钢锤分别在横截面的中心和支撑边缘位置激励水泥高架桥模型。根据这些数据,可以确定水泥高架桥模型的整体模式和局部模式。示出了由网支撑的部分的边缘在垂直方向上可以具有低阻抗。使用有限元方法的分析结果证实了水泥高架桥模型横截面模式的实验结果。研究结果表明,局部模式的振动有两种类型:(1)中心模式-顶板的中心可以移动,但边缘是固定的。 (2)边缘(卷筒纸)模式-面板的中心固定,但是边缘(卷筒纸支持)可以移动。

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