Analysis on Crosswind Stability of Van Semi-trailer in Bridge and Tunnel Connection Section
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摘要: 为揭示侧风条件下桥隧连接路段厢式半挂车瞬态气动特性变化及其对操纵稳定性影响规律,建立了计算流体力学与多体动力学动态双向耦合的仿真平台。在考虑牵引车与半挂车的相对转动基础上,对车辆行经不同位置时车身所承受的空气动力学载荷及周围流场结构进行分析,并利用横摆角和侧向位移评价整车的侧风稳定性。结果表明,牵引车与半挂车的相对转动会增大厢式半挂车在桥隧连接路段行驶时车辆的横摆角、侧向位移与气动载荷的幅值,固联牵引车和半挂车可以提高车辆的侧风稳定性。Abstract: A simulation platform for the two-way coupling of computational fluid dynamics (CFD) and multi-body dynamics (MBD) was established for transient analysis of the aerodynamic characteristics of the van semi-trailer in bridge and tunnel connection section under crosswind conditions. On the basis of considering the relative movement of the tractor and the semi-trailer, the aerodynamic loads and the surrounding flow fields of the vehicle are analyzed when the vehicle travels through different positions, and the crosswind stability of the vehicle is evaluated by the yaw angle and the lateral displacement. The simulation results show that the relative motion of the tractor and semi-trailer will increase the amplitude of yaw angle, lateral displacement and aerodynamic load of the van semi-trailer when driving on the bridge and tunnel connection, and fixing tractor and semi-trailer can improve the crosswind stability of the vehicle.
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Key words:
- transient analysis /
- stability /
- aerodynamic loads /
- multi-body dynamics /
- crosswind
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表 1 多体动力学模型参数
参数 数值 总质量/kg 36 908 质心到前轴距离/mm 7 373 质心高度/mm 1 602 整车横摆转动惯量/(kg·m2) 3.76 × 106 轮胎半径/mm 571.5 -
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