前副车架引起的WOT轰鸣问题优化、解决及质量属性平衡  

The Optimization, Solution and Weight Balance of WOT Booming Problem Caused by Front Sub-Frame

作　　者：郭志伟 张超 信连彪 魏泽松 王国军 毛杰 GUO Zhiwei;ZHANG Chao;XIN Lianbiao;WEI Zesong;WANG Guojun;MAO Jie(Geely Automobile Research Institute(Ningbo)Co.,Ltd.,Ningbo,Zhejiang,315336,China)

机构地区：[1]吉利汽车研究院(宁波)有限公司,浙江宁波315336

出　　处：《小型内燃机与车辆技术》2022年第5期63-67,共5页Small Internal Combustion Engine and Vehicle Technique

摘　　要：乘用车全油门加速(即WOT)轰鸣问题一直是整车NVH性能开发过程中的难点问题,原因在于引起WOT轰鸣问题的根源有很多,比如动力总成的标定,悬置衬套设计的合理性,车身NTF目标把控等。而前副车架作为发动机后悬置或后拉杆的安装载体,如何将其合理设计是整车属性开发绕不开的话题。优秀的副车架设计需要同时满足整车多方面性能需求,在车型设计开发过程中是有较高挑战性的。通过对某车型进行NVH试验和仿真以及传递路径分析,识别出前副车架在整车上的弯曲模态频率低是在整车WOT时发动机在3 800 r/min附近有轰鸣声的主要原因。为了在新车型NVH开发过程中避免发生类似问题,从概念设计开始,应用拓扑优化、尺寸优化等优化方法,由粗到精逐步细化设计方案,最终锁定优化方案。新副车架本体约束模态频率比上一代车型副车架提升约60 Hz,且减小质量1.8 kg,同时满足了NVH性能要求和底盘轻量化指标,为整车的NVH性能达标提供了必要条件。Wide Open Throttle(WOT) booming noise has been a typical problem for many years during the process of NVH performance development, because of the complex and varied reasons, such as the calibration of PT, the rationality of engine mounts bushing design, and the control of the body NTF, and so on. The reasonable design of front sub-frame, which is the bridge between the body and the engine &chassis, is very important in the development of full-vehicle attributes. So it’s a high challenge to meet several performance requirements at the same time for an excellent designed sub-frame in the process of vehicle development. Via NVH test and simulation, as well as TPA, it’s identified that the 1st bending modal frequency of sub-frame is too low, that’s the root cause of WOT-3800RPM. In order to avoid similar problems for the new vehicle development, topology and size optimization are used from the conceptual design to the final. The constraint modal frequency of finally design is 295Hz, improved by 60Hz, meanwhile, the weight is reduced by 1.8 kg, so as to meet the requirements of NVH performance and chassis lightweight.

关 键 词：WOT轰鸣 前副车架 NVH 模态优化 质量平衡 

分 类 号：U462.3[机械工程—车辆工程] U464[交通运输工程—载运工具运用工程] TB533[交通运输工程—道路与铁道工程]