汽车线束的动态串扰特性预测

Prediction of the dynamic crosstalk of automotive wiring hardness

针对汽车线束中导线相对位置和线束对地高度参数以及由于不同的安装方式和汽车不同的运动状态带来的随机性,提出了一种在低频下用来计算汽车线束动态串扰的统计学模型。利用镜像法计算获得了带有绝缘层导线的单位长度分布参数,运用统计学原理推导得到了线束动态串扰的均值与方差,并将计算所得合理的最差串扰值与273次随机中点布置样条插值法(RDSI)仿真结果进行了对比,验证了模型的准确性和可靠性。所建立的线束动态串扰统计模型可以根据实际情况灵活调整相关参数,实现快速预测,为车辆电磁兼容性设计提供依据。

Different installation methods and different moving states of automobile can bring randomness to the relative position of wire in automobile wiring harness and ground height of wiring hardness. A statistic model is proposed to calculate the dynamie crosstalk of automobile wiring harness under the low frequency. The image method is employed to acquire the unit length distribution parameters of the wire with insulation layer, and the principle of statistics is applied to infer the mean value and variance of the dynamic crosstalk of wiring harness. The reasonable worst- ease crosstalk value calculated by the proposed model is compared with the 273 times simulation results of random displacement spline interpolation to verify the accuracy and reliability of the model. The proposed statistic model can also adjust the relevant parameters flexibly according to practical situation and realize rapid prediction, which provide the basis to the design of vehicle electromagnetic compatibility. The model has very important practical significance.