相干函数对调制小波重构白噪声的路面不平度模型  

Road Irregularity Model via Wavelet-reconstructed White Noise Regulated by Coherent Function Pair

作　　者：陈士安[1] 李晓伟 张良城 夏鹏 王骏骋 CHEN Shi-an;LI Xiao-wei;ZHANG Liang-cheng;XIA Peng;WANG Jun-cheng(School of Automotive and Traffic Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu,China;Zhejiang Gold Intelligent Suspension Corporation,Wenzhou 325400,Zhejiang,China;Faculty of Mechanical Engineering and Automation,Zhejiang Sci-tech University,Hangzhou 310018,Zhejiang,China)

机构地区：[1]江苏大学汽车与交通工程学院,江苏镇江212013 [2]浙江亚之星汽车部件有限公司,浙江温州325400 [3]浙江理工大学机械与自动控制学院,浙江杭州310018

出　　处：《中国公路学报》2024年第11期301-310,共10页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(52072158,52205135)。

摘　　要：为确保以路面不平度为输入的车辆动力学仿真研究结果的可靠性,提出了一种基于并联型相干与非相干函数对调制小波重构白噪声的双轮辙路面不平度模型。首先,对标准白噪声信号进行小波分解操作后移除下截止频率以下的信号,重构得到下截止频率以上的白噪声。然后,将上述重构白噪声输入至具有精度校正项的积分传递函数,获得非平稳单轮辙路面不平度。最后,利用一对并联型相干与非相干传递函数调制3个独立的小波重构白噪声精度校正积分,生成得到非平稳双轮辙路面不平度。其中,对标准白噪声信号进行小波分解重构操作旨在提高下截止频率附近路面不平度功率谱密度的建模精度,使用具有精度校正项的积分传递函数是为了适应不同的路面不平度频率指数,采取并联型相干与非相干传递函数对调制操作保证了双轮辙路面不平度相干函数的建模精度。针对实际道路的2个建模应用结果表明,建模得到的路面不平度的功率谱密度和相干函数曲线与实际路面不平度的对应曲线高度吻合。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.

关 键 词：汽车工程 路面不平度 相干与非相干传递函数 下截止频率 小波分解重构 白噪声积分 

分 类 号：U463.33[机械工程—车辆工程]