| 基于流入角实时变化的气动性对操稳的影响 |
| 投稿时间：2021-08-04 修订日期：2021-08-31 点此下载全文 |
| 引用本文：高璐,高磊,孙礼.基于流入角实时变化的气动性对操稳的影响[J].计算机辅助工程,2021,30(4):. |
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| 中文摘要:为了研究汽车受侧风影响时，风压中心线位置对整车操稳的影响，通过在CCM+软件中计算出不同风速和不同流入角下所产生的气动力，获得气动力与风速、车速产生的合速度以及流入角的初始关系曲线。利用Matlab和Acar联合仿真技术，搭建空气动力学和车辆动力学的双向耦合模型，以风压中心线与质心的距离为变量进行仿真分析。结果发现：1、随着风压中心线由质心前方移动到质心后方，开环行驶时，车辆的侧向位移会减小，但是如果风压中心线位于车辆后方超过一定的距离，车辆会在气动力产生的横摆力矩作用下向另外一侧偏移。2、闭环行驶时，当风压中心线穿过车辆质心时，由于侧向力的存在，方向盘依然需要一个很小的转角来维持直线行驶，风压中心线需要继续后移来保证方向盘稳态时的回正。研究结果对车辆的造型开发具有参考意义。 |
| 中文关键词:气动性 操稳 双向耦合 风压中心线 流入角 质心 侧风 联合仿真 |
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| Influence of aerodynamics on handling stability based on real time change of inflow angle |
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| Abstract:In order to study the influence of the position of the wind pressure center line on the vehicle handling stability when the vehicle is affected by the crosswind, by calculating the aerodynamic force under different wind speed and inflow angle in CCM +, the initial relationship curve of aerodynamic force with wind speed, combined speed and inflow angle is obtained. By using the co-simulation technology of MATLAB and acar, the bi-directional coupling model of aerodynamics and vehicle dynamics is built, the distance between the center line of wind pressure and the center of mass is taken as the variable for simulation analysis. The results show that: 1. As the wind pressure center line moves from the front of the mass center to the rear of the mass center, the lateral displacement of the vehicle will decrease in open-loop driving, but if the wind pressure center line is located at the rear of the vehicle for more than a certain distance, the vehicle will shift to the other side under the yaw moment generated by aerodynamic force. 2. In closed-loop driving, when the wind pressure center line passes through the center of mass of the vehicle, the steering wheel still needs a small angle to maintain the straight-line driving due to the existence of lateral force, and the wind pressure center line needs to continue to move backward to ensure the steering wheel's steady-state return. The research results have reference significance for vehicle modeling development. |
| keywords:Aerodynamics Handling Bidirectional coupling The wind pressure center line Inflow angle Centroid Crosswind Co-simulation |
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