某重型牵引车踏步框怠速振动控制与研究

Research on Idle Vibration Control of Heavy Duty Truck Step Frame

摘要: 踏步框怠速振动直接影响着驾驶员的驾驶舒适性，不利于提高驾乘体验。为了解决某型重卡左踏步框的振动问题，首先对现有结构的模态及频响进行了计算，发现踏步框结构存在29.1 Hz的频率，表现为左踏步框沿整车纵向的振动，这与实车出现的踏步框怠速抖动情况相吻合；然后提出了3种优化方案，通过有限元方法对3种方案的模态及频响进行了分析，通过结果对比并结合整车实际布置方案，认为第3种方案是最佳的；最后对第3种方案进行实车验证，左踏步框振动改善效果明显。

Abstract: The vibration of step frame directly affects the comfort of driver, which is not conducive to improving the driving experience. In order to solve the vibration problem of the left step frame of a certain type of heavy truck. Firstly, modal and frequency response analysis of the old structure is carried out, it finds that the old structure has a frequency of 29.1 Hz, and at this frequency the left step frame vibrates along the longitudinal direction, which is consistent with the idling vibration of step frame in real truck. Secondly, three solutions are proposed, modal analysis and frequency response analysis of the three schemes are executed by finite element method. The third scheme is considered to be the best by comparing the results and combining with the actual layout scheme of the whole truck. Lastly, the third scheme is verified by actual truck and the vibration of the left step frame is improved obviously.