摘要
针对某款SUV在发动机空转空调开启情况下,驾驶员感受到来自转向系统方向盘的强烈振动,影响驾驶舒适性的问题,对方向盘进行振动测试、诊断及仿真分析。经研究发现由于方向盘前两阶约束模态频率与发动机怠速开空调二阶激励频率相耦合,导致方向盘共振。在此基础上,对转向系统进行模态避频优化,提出了转向系统结构加强、灵敏度分析及优化两种优化措施。对优化后的转向系统进行模态分析和振动测试验证,发现优化后的转向系统在怠速开空调时振动明显减小,转向系统NVH性能得到了明显改善。
Aiming at reducing the vibration of the steering wheel when a specific SUV's engine is idling,and improving the comfort of driving,vibration test,diagnosis and simulation analysis were carried out for the steering wheel. It was found that the first two order constrained modal frequencies of the steering wheel were coupled with the second order excitation frequency of the engine under idling condition,which led to the resonance of the steering wheel. Thus,optimization on the modal frequency of the steering system was conducted,in terms of structural strengthening and sensitivity optimisation of the steering system. As results,the vibration of the optimized steering system had a significant decrease under idling condition when the air conditioner was switched on,thereby evidently improving the NVH performance of the steering system.
基金
国家重点研发计划资助项目(2016YFD0700704)
关键词
转向系统
怠速振动
振动测试
模态分析
灵敏度分析
steering system
idling vibration
vibration test
modal analysis
sensitivity analysis
