驾驶室结构减振降噪的拓扑优化设计  

TOPOLOGY OPTIMIZATION DESIGN FOR NOISE REDUCTION IN A TRUCK CAB INTERIOR

作　　者：舒磊[1] 方宗德[1] 赵冠军[1] 

机构地区：[1]西北工业大学机电学院,西安710072

出　　处：《振动与冲击》2008年第3期113-116,共4页Journal of Vibration and Shock

摘　　要：针对驾驶室减振降噪,提出一种基于驾驶室声振耦合系统声学贡献度分析的结构优化方法。运用模态叠加法求解耦合系统在外界激励下的动力学响应,利用声学贡献度分析、评价并确定对驾驶员右耳声压贡献突出的板件,以贡献度最大面板区域为设计域、一阶固有频率最大化为目标函数对结构进行拓扑优化。结构优化改进后,耦合系统主要激振频率下驾驶员右耳位置峰值声压级降低29dB,表明在保持驾驶室结构重量相对不变的情况下运用该方法有效降低车内噪声。A structural optimization method for cab acoustic-structural coupled systems was proposed based on panel acoustic contribution analysis and could be used for noise reduction in a truck cab interior. Frequency response of acoustic-structural coupled systems was computed under excitations at the cab mounts in a frequency range from 20 to 200 Hz by using modal analysis method. Panel acoustic contribution analysis was done to determine the structural area of the cab contributing most to the noise levels on the driver’s right ear. Topology optimization was performed to maximize the lowest eigenfrequency of the most contributing structural area subjected to a given volume constraint. The new optimal and modified cab structure was obtained with a 29dB reduction of sound pressure level while the structural weight maintained relatively unchanged. The result demonstrates the potential significance of the new method developed for noise reduction in a truck cab interior.

关 键 词：优化 结构 驾驶室 减振降噪 

分 类 号：U463[机械工程—车辆工程]