车辆四轮相关时域随机输入通用模型的研究

Study on General Model of Random Inputs of the Vehicle with Four Wheels Correlated in Time Domain

在分析单轮时域随机输入模型产生机理基础上,建立了车辆四轮相关随机输入的滤波模型。在模型中根据各向同性假设直接得到了与车辆轮距有关的左右轮相干函数而无需实测相干函数,因此该模型适合各种车辆,通用性好,计算方便。所得路面功率谱与理论功率谱吻合很好,相关性也得到验证。该模型对车辆四轮相关频域随机输入模型也有一定的参考作用。

Based on the generating mechanism of random input model of single wheel, a filtered white noise model for the random inputs with four wheels correlated was established. According to the assumption of isotropy,the coherent function between left and right wheels was directly obtained without measurement, therefore, this model was very applicable to various vehicles, and was easy to calculate. An analysis example showed that the simulation PSD of road was very consistent with the theoretical values, and the correlation has been proved valid. This model has also a certain reference to the random input model with four wheels correlated in frequency domain.