增程式电动车悬置系统优化及NVH性能测试

发布时间：2018-01-30 03:03

本文关键词： 增程式电动汽车动力总成悬置系统振动解耦半阶次振动 NVH性能测试　出处：《中北大学学报(自然科学版)》2016年03期 　论文类型：期刊论文

【摘要】：为了改善增程式电动车的NVH性能,采用四点衬套式悬置系统支撑该电动车的动力总成,同时设计了两种匹配方案.原车状态的设计方案存在较严重的振动耦合现象,经过悬置系统固有频率匹配与振动解耦率的优化以后,主振动的振动解耦率均高于80%,频率分布对于怠速工况的隔振有利.本文对优化设计的悬置系统进行了NVH性能测试,结果表明:四个悬置在三个方向的怠速工况隔振量都在20dB以上.怠速工况下,方向盘的振动加速度均小于0.05 g,半阶次无明显振动;当发动机转速为3 000r/min时,方向盘处一阶主振动较小,振动加速度只有0.02 g,而半阶次振动加速度非常大,最大振动加速度达到0.15 g.该研究工作表明,半阶次振动是中高转速下增程式电动车振动和噪声产生的主要原因.
[Abstract]:In order to improve the NVH performance of a programmable electric vehicle, a four-point bushing suspension system is used to support the powertrain of the electric vehicle. At the same time, two matching schemes are designed. The design scheme of the original vehicle state has serious vibration coupling phenomenon, after the optimization of the natural frequency matching and vibration decoupling rate of the mount system. The vibration decoupling rate of the main vibration is higher than that of 80, and the frequency distribution is favorable to the isolation of idling condition. The NVH performance of the optimized suspension system is tested in this paper. The results show that the vibration isolation in three directions is above 20dB, and the vibration acceleration of steering wheel is less than 0.05 g, and there is no obvious vibration in half order. When the engine rotate speed is 3 000 r / min, the first order main vibration at the steering wheel is small, the vibration acceleration is only 0.02 g, and the half order vibration acceleration is very large. The maximum vibration acceleration is 0.15 g. The research results show that the semi-order vibration is the main cause of the vibration and noise of the programmable electric vehicle at medium and high speed.
【作者单位】：中北大学机电工程学院;奇瑞新能源汽车技术有限公司;奇瑞汽车股份有限公司产品开发管理中心;
【基金】：国家自然科学基金资助项目(51476150)
【分类号】：U469.72
【正文快照】： 0引言近年来,电动汽车研究取得重大发展,但是电池能量密度不高、寿命较短,导致续航里程短,是其当前市场推广的最大瓶颈.为了解决电动汽车续航里程短的问题,各种增程式电动汽车应运而生.增程式电动汽车在纯电动汽车的基础上加载车载充电器,从而大大延长了电动汽车的续航里程.增

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