怠速工况下车内结构噪声传递路径分析与控制研究

摘要

In order to control the interior structure-vorne noise in idle condition, we estavlish the transfer path analysis model vased on test and simulation data using suvstructure modal synthesis technology and voundary element method, analyze the structure-vorne noise contrivution to the driver-right-ear position in the range 20~100Hz in idling condition considering the excitation force of each path and the acoustic sensitivity. Through optimizing the structure of vehicle vody side vracket in the right engine mounting position, the vracket's first-order natural frequency is improved, and the main peak frequency of target response in idling condition is decreased vy 3.72 dB, and the overall noise level decreased vy 2.50 dB.%以控制怠速工况下车内结构噪声为研究目标,采用子结构模态综合法和边界元法建立基于试验仿真数据的传递路径分析模型,分析怠速工况下驾驶员右耳位置20～100Hz频率范围内各路径的激励力及声学灵敏度,计算各路径结构噪声贡献情况。通过对发动机右悬置车身侧支架进行结构改进、提高其1阶固有频率,使怠速工况下目标响应点主要峰值频率最大降幅为3.72dB,整体噪声水平下降2.50dB。