Road Irregularity Model via Wavelet-reconstructed White Noise Regulated by Coherent Function Pair
To ensure the reliability of vehicle dynamics simulation results based on road irregularity input,a two-wheel road irregularity model using wavelet-reconstructed white noise and regulated by a parallel coherent/incoherent function pair was proposed.First,a standard white noise signal was reconstructed by removing the signal below the lower cut-off frequency after completing wavelet decomposition to obtain white noise above the lower cut-off frequency. The reconstructed white noise was then input into an integration transfer function with a precision correction term to obtain a nonstationary single-wheel road irregularity.Finally,three independent wavelet-reconstructed white noise precision correction integrals were modulated using a pair of parallel coherent/incoherent transfer functions to generate nonstationary two-wheel road irregularities.The wavelet decomposition and reconstruction of standard white noise improve the modeling accuracy of the road irregularity's power spectral density around the lower cut-off frequency using an integration transfer function with a precision correction term to adapt to different road irregularity frequency exponents. The modulation of the parallel coherent/incoherent transfer functions ensures the modeling accuracy of the coherence function between two-wheel road irregularities. The PSDs and coherent function curves of the modeled road irregularities closely agree with those of the actual ones,as demonstrated by two modeling applications on actual roads.
automotive engineeringroad irregularitiescoherent and incoherent transfer functionslower cut-off frequencywavelet decomposition and reconstructionwhite noise integration
万方数据
维普
