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首页> 外文会议>Vehicle aerodynamics, 2012. >Unsteady Vehicle Aerodynamics during a Dynamic Steering Action: 1st Report, On-Road Analysis
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Unsteady Vehicle Aerodynamics during a Dynamic Steering Action: 1st Report, On-Road Analysis

机译：动态转向动作期间的非定常车辆空气动力学：第一份报告，道路分析

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Relationships between vehicle's high speed stability during a steering action and following aerodynamic coefficients have already been reported in the past: coefficients for time-averaged aerodynamic lift, yawing moment, side force and rolling moment. In terms of the relationships, however, we have occasionally experienced different high speed stability during steering input even with identical suspension property and almost the same aerodynamic coefficients. A vehicle during high speed cornering shows complex behavior due to unsteady air flow around the vehicle and unintentional steering input from a driver. So it is supposed that the behavior is too complex to be fully described only with those aerodynamic coefficients. Through on-road test [1] and CFD analysis [2,3,4], we have studied unsteady aerodynamic characteristics around a vehicle for pitching motion during straight-line high speed driving. As a result, the existence of aerodynamic damping to stabilize the pitching motion was confirmed. The result also showed that unsteady aerodynamic characteristics had a substantial influence on the vehicle stability during straight-line high speed driving. The unsteady characteristics are assumed to affect lateral and yawing vehicle motions during cornering as well. In recent years, several studies on unsteady aerodynamic characteristics for a yawing vehicle have been conducted in wind tunnel [5,6], but not yet enough for on-road test. In this study, we attempted to clarify how the unsteady air flow around a steered vehicle influenced on the vehicle during high speed cornering on road. In the first report of the two for this time, we examined vehicle motions and aerodynamic forces loaded on the vehicle. The results of analysis on the vehicle motion and its surface pressure fluctuation indicated that unsteady aerodynamic forces to hold back the vehicle cornering motion were created there. It was also confirmed, in a comparison of two vehicles having different high speed stability during steering input, that the more stable vehicle had greater aerodynamic forces to hold back the cornering force. Thus it was suggested that the unsteady aerodynamic forces swayed the vehicle stability during high speed cornering.
机译：过去已经报道了车辆在转向操作过程中的高速稳定性与跟随的空气动力学系数之间的关系：时间平均空气动力升力，偏航力矩，侧向力和侧倾力矩的系数。但是，就这些关系而言，即使具有相同的悬架特性和几乎相同的空气动力学系数，我们在转向输入过程中偶尔也会遇到不同的高速稳定性。由于车辆周围的气流不稳定以及驾驶员的无意识转向输入，高速转弯期间的车辆表现出复杂的行为。因此，可以认为这种行为过于复杂，无法仅用空气动力学系数来完全描述。通过道路测试[1]和CFD分析[2,3,4]，我们研究了直线高速行驶过程中车辆俯仰运动时车辆周围的非定常空气动力学特性。结果，证实了存在用于稳定俯仰运动的空气动力学阻尼。结果还表明，在直线高速行驶过程中，不稳定的空气动力学特性对车辆的稳定性有很大影响。假定不稳定特性也会在转弯时影响车辆的横向运动和偏航运动。近年来，在风洞中进行了几项关于偏航汽车的非定常空气动力特性的研究[5,6]，但还不足以进行道路测试。在这项研究中，我们试图阐明在高速转弯道路上，转向车辆周围的不稳定气流如何影响车辆。在这两者的第一份报告中，我们检查了车辆的运动和负载在车辆上的空气动力。对车辆运动及其表面压力波动的分析结果表明，在那里产生了不稳定的空气动力来阻止车辆的转弯运动。通过比较在转向输入期间具有不同的高速稳定性的两辆车，还可以确定，更稳定的车具有更大的空气动力以抑制转弯力。因此建议在高速转弯期间，不稳定的空气动力会影响车辆的稳定性。

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