Modeling of Non-Gaussian Road Profile Based on Measured IRI
Power spectral density is widely used to characterize road roughness,which is also used to evaluate the reliability and fatigue life of weapon systems(such as artillery and combat vehicles)under road vibration environment.The implicit assumption is that the road roughness follows a Gaussian dis-tribution.However,actual measured road roughness is often non-Gaussian,which leads to faster fa-tigue failure of weapon equipment systems.In order to improve the evaluation accuracy,a non-Gaussian road profile modeling method based on the measured International Roughness Index(IRI)was pro-posed.A Gaussian road profile was firstly generated from the ISO standard power spectral density.Then amplitude modulated signals with the same statistical characteristics were generated by the measu-red IRI.Finally,a non-Gaussian road profile was generated based on the amplitude modulation method.It will lead to undertesting to describe road roughness by a Gaussian model.The same statistical pro-perties as the measured IRI can be obtained based on the proposed method.This method can improve the reliability and durability evaluation accuracy of weapon systems under road profile excitation.
power spectral densitynon-Gaussian road profileinternational roughness indexam-plitude modulation method
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