Abstract:

The importance of impact noise control of hydraulic pile drivers is elaborated. The theory of acoustic fluidstructure coupling and the corresponding finite element method are introduced. According to the theoretical characteristics of impact frequency spectrum, the relation of noise and buffer time is analyzed. Using the finite element software ANSYS/LSDYNA, the numerical simulation of impact of a pile driver is carried out. The results show that the impact noise can be reduced by prolonging the buffer time.

Key words: acoustics, impact noise, fluidstructure coupling, ANSYS/LSDYNA, buffer time

摘要：

首先阐述了控制液压锤冲击噪声的重要性，介绍了冲击噪声的声学流固耦合理论及其有限元方法。根据冲击频谱的理论特性，分析了噪声与缓冲时间的关系，并利用有限元分析软件ANSYS/LSDYNA进行仿真，从而论证了通过延长缓冲时间来控制噪声方法的有效性。

关键词: 声学, 冲击噪声, 流固耦合, ANSYS/LSDYNA, 缓冲时间