铁道车辆弹性车体被动减振仿真分析

Simulation on Passive Vibration Control of Flexible Carbody of Railway Passenger Vehicles

摘要:

为了抑制铁道车辆车体弹性振动,提出在车体底架下方纵向安装液压减振器的方案.将车体视为均质欧拉梁,包括结构阻尼和车体液压减振器阻尼在内,建立刚柔耦合垂向动力学模型;采用基于虚拟激励法的平稳性快速算法,研究车体液压减振器对车体弹性振动的影响.研究表明,车体减振器可以有效控制车体弹性振动,减振器阻尼系数越高,对车体刚性的要求就越低.对液压减振器的安装位置分析表明,减振器越靠近车体中部,减振性能越好.本算例中,当车体减振器阻尼系数为5.0×109 N·s·m-1、垂向1阶频率在6.5 Hz以上时,即可满足200

Abstract:

To suppress the vibration of flexible carbody of railway vehicle,flexible damper is proposed to be longitudinally installed under carbody underframe.Taking the carbody as a uniform Euler beam supported on secondary suspension,including the structure damping ratio and the flexible damper,a vertical model was built to research the effects of flexible damper on the vehicle ride quality by using the fast ride quality calculation algorithm.The results show flexible damper can help control the flexural vibration of the flexible carbody and the higher the flexible carbody damping coefficient,the lower the first bending frequency of carbody need to be.Researches also show that the nearer the carbody damper installation position is to the center of the carbody,the better effects it will achieve.An example is illustrated in the paper.When the coefficient of flexible damper reaches to 5.0× 109 N·s·m-1,the required lowest bending frequency will drop to 6.5 Hz,which can still achieve good ride quality under 200 km·h-1 operational speed.