Abstract：Road model is an essential input to analyze vehicles' performance in application of Virtual Proving Ground Technique. In order to digitize the real road of an automobile proving ground located in western China, the Mobile Road Scanning System which consists of PPS laser scanner, IMU inertial navigation module and GNSS base station was constructed to acquire physical roads’ 3D point cloud. The centerline of physical road was fitted by spline curve, and then 2D planar point cloud was generated along it. Next, the elevations corresponding to those 2D scattered points were calculated by natural neighbor interpolation method. Finally, the 3D point cloud was transformed into RGR model. Combining RGR road model with FTire tire model and vehicle multi-body dynamics model, a fully functional virtual proving ground simulation system was built. In order to check the accuracy, a road load data acquisition test was carried out by a SUV equipped with 6-axes Wheel Force Transducer and certain acceleration sensors. In both cases of Pothole and Cobblestone road, the simulated wheel center vertical forces and accelerations are in good agreement with measured data, which indicates the constructed RGR model and its virtual proving ground has a superior accuracy.
Key words: Virtual Proving Ground; RGR road model; road scanning; road load spectrum
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