摘 要：噪声传递函数是控制汽车NVH性能的关键指标。本文针对某车型开发中其后悬置接附点处噪声传递函数在外界激励频率达到173 Hz时存在超标峰值的问题，建立了包含内饰车身与声腔的有限元模型，基于HyperMesh软件进行前处理，并在OptiStruct求解器中进行模态频率响应分析。通过结合提升接附点动刚度与基于节点贡献量分析的传递路径优化，实现了对峰值频率的协同控制。优化后，该处峰值噪声成功降低5dB,达到目标值以下。结果表明，在动刚度优化受限时，辅以传递路径加强是一种行之有效的解决方案，为车辆开发阶段的NVH性能提升与问题根治提供了明确的工程实践指导。
关键词：噪声传递函数；后悬置；动刚度；传递路径；NVH
中图分类号：U461.4 文献标志码：A DOI：10.15917/j.cnki.1006-3331.2025.06.006
Diagnosis and Optimization Analysis of Noise Transfer Function at the Rear Suspension Mounting Points of a Vehicle Model
YAN Chuang,HE Min,TANG Xian,XIAO Shibo,YUAN Lingoong
Abstract: The noise transfer function represents a key indicator for evaluating vehicle NVH performance.This paper investigates the excessive noise peak occurring at the rear suspension attachment point under external excitation at 173 Hz during the development of a specific vehicle model.It study establishes a finite element model incorporating the interior body and acoustic cavity,performs pre-processing using HyperMesh,and conducts modal frequency response analysis through the OptiStruct solver.By integrating enhanced dynamic stiffness at the attachment point with transfer path optimization based on node contribution analysis,the proposed method effectively suppresses the peak response.Following optimization,the peak noise level drops by 5dB,falling below the specified target.The results confirm that combining transfer path reinforcement with dynamic stiffness enhancement provides an effective solution when dynamic stiffness optimization alone proves insufficient,thereby offering valuable engineering guidance for NVH performance improvement and issue resolution during vehicle development.
Key words: noise transfer function; rear suspension; dynamic stiffness; transfer path; NVH
