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首页> 外文会议>Vehicle aerodynamics, 2012. >Validation and Modeling of Transient Aerodynamic Loads Acting on a Simplified Passenger Car Model in Sinusoidal Motion
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Validation and Modeling of Transient Aerodynamic Loads Acting on a Simplified Passenger Car Model in Sinusoidal Motion

机译：基于正弦运动的简化乘用车模型上的瞬态气动载荷的验证和建模

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Dynamic wind-tunnel tests of a simplified passenger car model were conducted using a two-degree-of-freedom model shaker. Time-resolved aerodynamic loads were derived from a built-in six-component balance and other sensors while the model underwent sinusoidal heaving and pitching motions at frequencies up to 8 Hz. The experimental results showed that frequency-dependent gains and phase differences between the model height/angle and the aerodynamic loads are in close agreement with those predicted by large-eddy simulation (LES) using an arbitrary Lagrangian-Eulerian (ALE) method. Based on these findings, transient aerodynamic loads associated with lateral motions were also estimated by LES analysis. Based on the above results, a full-unsteady aerodynamic load model was then derived in the form of a linear transfer function. The force and moment fluctuations associated with the vertical and lateral motions are well described by the full-unsteady aerodynamic load model. This load model integrates added mass and moment-of-inertia terms into the quasi-unsteady model that takes into account the effect of the motion rate as an equivalent change in the relative inflow angle. Vertical motion analysis of a nominal passenger car model coupled with the full-unsteady aerodynamic load model showed that the transient aerodynamic loads affect the frequency response in such a way as to reduce its resonance frequency. The added mass and moment-of-inertia terms were eventually confirmed to have little effect on the vehicle dynamics; it should, however, be mentioned that their inclusion is inevitable in the modeling of transient aerodynamic loads, which inherently involves the added mass effect.
机译：使用两自由度模型振动器对简化的乘用车模型进行了动态风洞测试。时间分辨的空气动力学载荷来自内置的六组分天平和其他传感器，而模型在高达8 Hz的频率下进行正弦起伏和俯仰运动。实验结果表明，模型高度/角度与空气动力学载荷之间的频率相关增益和相位差与使用任意拉格朗日-欧拉（ALE）方法的大涡模拟（LES）所预测的增益和相位差非常一致。基于这些发现，还通过LES分析估计了与横向运动相关的瞬态气动载荷。基于以上结果，然后以线性传递函数的形式导出了完全不稳定的空气动力学负荷模型。完全非定常的气动载荷模型很好地描述了与垂直和横向运动相关的力和力矩波动。该载荷模型将增加的质量和惯性矩项集成到准不稳定模型中，该模型考虑了运动速度的影响，即相对流入角的等效变化。对标称乘用车模型的垂直运动分析与全非定常空气动力学负载模型相结合，表明瞬态空气动力学负载会以降低共振频率的方式影响频率响应。最终证实，增加的质量和惯性矩对车辆动力学几乎没有影响。但是，应该提到的是，在瞬态空气动力载荷的建模中不可避免地要包含它们，这自然会涉及附加的质量效应。

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