路面国际不平度指数的两种描述及其应用*

doi:10.19562/j.chinasae.qcgc.2020.08.014

Abstract

Abstract: In order to understand and apply international roughness index of road, the time domain description and time frequency domain description of international roughness index of road are studied. Based on the standard vehicle model of international roughness index of road, the time domain description of the international roughness index of road and the differential equations of motion for the vehicle model are established. In space frequency domain, the power spectral density representation of road roughness is established; in time frequency domain, the power spectral density representation of road excitation is established. Frequency response expression of suspension dynamic deflection velocity is derived from the standard vehicle model, and the time frequency domain expression of international roughness index of road is built. It is proved by analysis that the international roughness index of road is equivalent to power density of road excitation. Using the measured road roughness data of LTPP project in the United States, the international roughness index of road in time domain and time frequency domain are obtained. By comparison of the two, the correctness and validity of the description of the time frequency domain of the international roughness index of road are proved. The international roughness index of road in time frequency domain can be better determined by introducing median filter into the measured road roughness data.

Key words: international roughness index of road, time domain description, time frequency domain description, statistical characteristics of road, LTPP project

Zhang Zhenwei, Chen Tao, Wang Wenzhu, Zhao Qi, Li Jie. Two Descriptions of International Roughness Index of Road and Their Application[J].Automotive Engineering, 2020, 42(8): 1097-1102.

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Two Descriptions of International Roughness Index of Road and Their Application

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