关键词: 虚拟试验场；3D 数字路面；载荷谱；扭矩；疲劳耐久

Abstract: At present, virtual proving ground (VPG) is widely used because of its short development cycle and low cost. However, due to the certain difference between the multi-body simulation model and the actual model, the torque accuracy of the hard point can't be guaranteed, and the reliability of fatigue durability simulation based on the virtual proving ground is also unreliable. This paper selects the rear sub-frame and vehicle body as the research objects; extract the hard point load spectrum of the rear sub-frame and the vehicle body by VPG simulation; and use the torque and non-torque load spectrum for the fatigue durability simulation analysis respectively; compare and analyze the results of fatigue durability simulation analysis. The comparison results shows that the damage value ratio of fatigue durability simulation analysis by the torque and non-torque load spectrum is between 0.54～0.99. In general, the torque base on VPG has less influence of the result of fatigue durability simulation. Even though the torque accuracy can't be guaranteed, the overall results of fatigue durability simulation analysis will not be affected, which also proves that the fatigue durability simulation analysis based on VPG can be reliable.

Key words: Virtual proving ground; 3D digital road; Load spectrum; Torque; Fatigue durability