前置后驱车型传动系扭振问题分析与优化
2021-08-23纪浩韦进光韦宝侣符琳李小珊
纪浩 韦进光 韦宝侣 符琳 李小珊



摘 要:某前置后驱车型在1900~2050rpm转速、三挡全油门加速工况下出现车内轰鸣声问题,本研究通过实测与整车扭振仿真确定该NVH问题由传动系扭振引起,并通过重新匹配设计飞轮参数解决了该NVH问题。经实测验证,车内噪声由69.2dB下降到59.8dB,车内轰鸣声主观感受改善明显。
关键词:扭振 前置后驱 轰鸣声 传动系统
Analysis and Optimization of Torsional Vibration in the Transmission System of Front-rear Drive Vehicle
Ji Hao Wei Jinguang Wei Baolu Fu Lin Li Xiaoshan
Abstract:A front-end rear-wheel-drive model has a roaring sound problem in the 1900-2050rpm speed and three-gear full-throttle acceleration. This study determined that the NVH problem was caused by the torsional vibration of the drive train through actual measurement and vehicle torsional vibration simulation. And the NVH problem was solved by re-matching the design flywheel parameters. It is verified by actual measurement that the noise inside the car has dropped from 69.2 dB to 59.8 dB, and the subjective feeling of the roar inside the car has been significantly improved.
Key words:torsional vibration, front-rear drive, roar, transmission system
1 前言
目前市面上微型车以前置后驱布置为主,由于爬坡性能优越深受客户喜爱。微车传动系统是由多自由度的非线性扭转振动系统组成[1,2],主要包括了发动机、离合器、变速器、传动轴、后桥、半轴等零部件系统。随发动机点火爆震引起传动系统各级部件转速加速度波动,当外界激励与传动系统频率重合就会产生共振问题[3]。振动通过各个传动系统安装支座传到车身,引起车厢抖动及轰鸣[4]。王东[5]研究了由减速器齿轮耦合噪声产生的机理,从激励源控制的角度出发,降低了车内扭振轰鸣声。黄丰云[6]等通过考虑万向节不等速及后桥齿轮啮合刚度,搭建了传动系统扭振数学模型,为扭振系统的研究提供了理论依据。
本文为解决某后驱微车在研发过程中出现的三挡全油门加速工况下车内严重轰鸣声NVH问题,通过Polytec-RLV-5500激光扭振测试仪、LMS SCADAS Mobile数采等设备采集数据,利用LMS Virtual.Lab搭建整车传动系统仿真模型,并通过测试数据验证仿真模型的准确性,为降低车内轰鸣声提供了有效的解决方案。
2 传动系统扭振仿真模型
2.1 扭振整车仿真模型搭建……p>
