拖拉机驾驶室声学特性仿真研究

利用有限元分析软件ANSYS建立FT80拖拉机驾驶室空腔模型,将模型导入声学分析软件SYS-NOISE,并在SYSNO ISE中实现了有限元法和间接边界元法的声固耦合;采用间接边界元法分析计算驾驶室的声学特性;对空腔、有座椅、有座椅及驾驶员三种模型驾驶室的耳旁声场声压进行比较;分析研究座椅和驾驶员对驾驶室内的声学贡献,证明座椅、驾驶员对拖拉机驾驶室内噪声存在一定的影响,建模时应加以考虑。

Study on Simulation of Acoustics Characteristics of Tractor's Cab

The finite element model of FT80 tractor＇ s cab is established by using FEM software ANSYS. Then, using the acoustics software SYSNOISE, the sound-solid coupling analysis with the combination of FEM and intermediate BEM is carried out. By means of the intermediate BEM, the acoustic characteristics of the cab are computed and analyzed. The sound pressures of near-the-ear sound fields of three cases-empty cab, eab with a chair in it, and cab with a chair and a driver in it-are computed and compared. The acoustic contribution of the chair and the driver in the cab is calculated and analyzed. It is proved that the chair and the driver have some influences on the internal noise of the cab. These influences should be considered in the modeling.