车辆行驶路面的数字化建模方法研究

为提高车辆虚拟试验结果的准确性，对车辆行驶路面数字化建模方法进行了研究。利用双轨真实路形计对中波和长波起伏路面进行测量，并将测量结果与依据路面外形设计参数建立的波形曲线进行对比，验证了测量方法的准确性和可信性；利用双轨真实路形计分别对渣土路、砂石路两种随机路面进行测量，获取了路面不平度实测数据，并采用基于周期图法改进的Welch算法对实测数据进行了功率谱密度估计，依据相关国家标准GB/T 7031—2005评定了路面等级。采用谐波叠加法建立了三维随机路面模型，通过与实测数据作功率谱密度对比，表明二者具有较好的一致性，验证了三维随机路面模型的可信性。

Research on Digitized Modeling Method of Riding Road of Vehicle

Digitized modeling method of riding road of vehicle is researched for improving the accuracy of vehicle virtual test results. Dual-track real profilometer is used to measure the periodic medium wave and long wave roads. The credibility and veracity of measuring method are verified by comparing actual measuring data with wave curves which are built based on the design parameters of road outline. Then two kinds of random roads, i.e., residue road and gravel road, are measured by using a dual-track real profilometer, and the actual road roughness data is obtained. Power spectral density (PSD) of actual measuring data is estimated by Welch algorithm based on modified periodogram method, and the rank of measuring random road is assessed according to GB/T 7031—2005 national standard. The 3D random road models are built by means of harmony superposition method, of which PSD is consistent with actually measured data, and its credibility is verified consequently.