摘要
为解决某三缸机车型怠速振动问题,利用Matlab仿真平台建立悬置系统数学模型,对影响悬置系统振动传递特性的各因素进行研究。研究结果表明,悬置系统模态频率分布与解耦对提高悬置系统NVH性能同等重要。优化悬置刚度与弹性中心位置,使系统弹性轴与扭矩轴重合,可实现系统的完全解耦,获得更低的俯仰(Pitch)模态频率,并使驾驶员右耳处的声振传函(NTF)响应在低频峰值处降低4.5 d B。试验结果及主观评价表明,车辆怠速振动问题改善明显。
In order to solve the idle vibration problem of three-cylinder-engine, engine-mounting system mathematical model by Matlab was set up, and the influencing factors of transmission characteristics of the engine-mounting system were researched. The results showed that engine-mounting system modal frequencies and decoupling are equally important to improve the NVH performance. It is possible to realize the complete decoupling of system with lower pitch mode and higher performance of vibra- tion isolation by optimizing the mounting parameters and superposing the elastic-axis to torque-roll-axis. The response of vehicle transfer function reduced 4.5 dB in low frequency peak and the idle vibration problem improved significantly.
出处
《农业装备与车辆工程》
2017年第1期60-64,共5页
Agricultural Equipment & Vehicle Engineering
关键词
悬置系统
扭矩轴
弹性轴
能量解耦
优化设计
engine-mounting system
torque-roll-axis
elastic axis
energy decoupling
optimum design
