基于面接触的车桥耦合振动研究

Vehicle-bridge coupled vibration based on the patch contact

现有分析车-桥耦合振动的研究中都假设移动车辆与路面的接触关系为点接触。事实上,轮胎与路面是通过面接触的。通过建立新的三维车轮模型,分析了面接触对车-桥耦合振动的影响,将车轮与路面的接触面模拟为长方形,通过接触面间的位移协调条件和力相互作用建立车-桥耦合振动方程。对车速、车轮刚度与阻尼、接触面尺寸大小、车辆数目等进行参数分析,研究了接触面对车-桥耦合振动的影响。数值计算与试验结果验证表明:所提出的模型能更准确合理的研究车桥耦合振动。

When establishing the motion equations of the bridge-vehicle coupling system,most researchers simplify the contact between the vehicle tire and road surface as a point one.In reality,a vehicle tire deforms and makes contact with the road surface over a footprint area called patch contact.This paper presents a new three-dimensional wheel model.The effects of the patch contact on dynamic response of the bridge-vehicle coupling system are analyzed.The vehicle tire is modeled as a three-dimensional elementary spring model,and the patch contact is assumed in rectangular form.The vehicle-bridge coupled vibration equations are established based on the displacement and force concordances between the patch contacts.A series of simulation studies have been carried out in which various factors,such as vehicle speed,tire stiffness and damping,size of the patch contact,number of vehicles,are analyzed and the effects of patch contact on vechicle-bridge coupled vibration are investigated.The numerical simulations and field test results show that the proposed method can more precisely and rationally simulate the interactions between the bridge and vehicle.