楼内配变室砼地板结构振动声辐射分析

Structural Vibration and Sound Radiation Analysis of the Concrete Floor of Indoor Substations

楼内配变设备(例如变压器)工作时会引起与之相连的混凝土地板振动,并通过传递引起其它结构振动,这些振动会产生结构声辐射现象。对此进行分析为楼内配变室结构传声研究的一部分工作,假定砼地板四边固支并适当考虑地基的弹性作用,采用Hamilton方程和振型叠加法对地板的振动位移方程进行了推导与求解,并据此对地板的结构声辐射进行研究。其中注意到振动模态对结构声辐射功率贡献的非独立性,计入结构振动模态耦合项的影响,对地板的结构声辐射效率与声功率进行分析。

Operation of indoor substations (e.g. transformers) in buildings can induce adjacent concrete floor vibration,which can be transferred to the other portions of the building structure and cause the structure-borne sound radiation. In this paper, the structure-borne sound radiation induced by the indoor substations is studied. The concrete floor is simplified to an elastic plate with the four sides simply supported laid on the elastic foundation. The vibration displacement equations of the floor are derived and solved using the Hamilton equation and the modal superposition method. Accordingly, the structureborne sound radiation is studied. It is noticed that the contribution of the vibration modes to the structure- borne sound radiation is not individual. Thus, the influence of the coupling terms of the structural vibration modes is considered for analyzing the radiation efficiency of the structure-borne sound and the sound power of the concrete floor.