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国际平整度指数IRI和路面功率谱密度PSD是评价路面平整度的两大指标,通过理论公式的推导,建立了两大指标的换算关系。在此基础上,给出了基于离散傅立叶逆变换的路面不平度仿真过程,推导得出了基于国际平整度指数IRI的路面不平度仿真过程,并对仿真精度进行了验证。仿真结果表明:利用该方法可以直接通过国际平整度指数IRI对路面不平度进行时域仿真,且仿真精度较高。最后,结合实测高速公路的国际平整度指数IRI对实际路面进行了不平度仿真,得到实际路面的不平度起伏情况。
International roughness index (IRI) and pavement power spectral density (PSD) are the two major indexes to evaluate the road surface roughness. Through the deduction of the theoretical formula, the relationship between the two indexes is established. On this basis, the road roughness simulation process based on inverse discrete Fourier transform is given, and the road roughness simulation process based on International Flatness Index (IRI) is deduced. The simulation accuracy is verified. The simulation results show that the method can directly simulate the road surface roughness by the IRI, and the simulation accuracy is high. Finally, the roughness of the actual road surface is simulated with the international roughness index IRI of the measured expressway, and the unevenness of the actual road surface is obtained.