基于Acoustics的工程机械驾驶室结构噪声分析

Structural noise analysis of engineering machinery cab based on Acoustics

以某款工程机械驾驶室为研究对象,建立驾驶室结构有限元模型和声学模型,考虑声腔—结构耦合作用,开展声学特性分析,得到驾驶室声学模态特性,从而判断驾驶室声腔设计是否合理。利用试验数据,对驾驶室进行板块声学贡献度分析,找出关注频率范围内对噪声贡献度较高的板件,从拓扑优化方面对驾驶室关键部件进行优化和降噪处理,并对优化后的驾驶室进行仿真,验证优化的有效性。

One certain model of engineering machinery cab is studied in this thesis. Finite element model of the cab and acoustic model are established. Considering the impact of acoustic-structure coupling, acoustic modal characteristics are obtained by analyzing acoustic properties which can be applied to estimate whether the cab acoustic cavity is reasonable. By analyzing cab plate acoustic contribution, greater influence factors which cause noise problems under important frequencies can be found. Topological optimization is taken to optimize and reduce noise for key components in the excavator cab . Simulation of the optimized cab shows the effectiveness of optimization methods.