天窗密封条摩擦异响控制方法研究

Research on Control Method of Abnormal Friction Noise of Sunroof Sealing Strip

针对颠簸路面条件下天窗密封条摩擦异响问题,模拟真实路况向车辆输入载荷信号进行频率响应分析。首先,在车身与天窗之间定义异响评价线(E-Line),针对密封条与天窗间±Z向、±Y向的往复相对运动,通过计算获取每条评价线中Y向、Z向最大相对位移;其次,利用摩擦试验台对密封条与聚氨酯(PU)面进行粘滑试验,获取密封条最小异响位移;最后,通过对比仿真与测试的结果判断是否存在异响风险。结果表明,通过控制天窗与车身相对位移及密封条最小异响位移,可在车辆开发阶段降低密封条摩擦异响风险。

To solve the problem of abnormal friction noise of sunroof sealing strip on bumpy road,the frequency response analysis of vehicle input load signal simulating real road conditions was carried out.Firstly,an abnormal sound Evaluation Line(E-Line)was defined between the car body and the sunroof.Because the seal and the sunroof produced to-and-fro movement in Z direction and Y direction,the maximum relative displacement in Y direction and Z direction in each E-Line was obtained by calculation.Secondly,stick-slip test between sealing strip and PU surface was carried out on friction test bench to obtain the minimum abnormal noise displacement of seal.Finally,the results of simulation and test were compared to judge whether there was abnormal noise risk.The results show that by controlling the relative displacement between sunroof and vehicle body and the minimum abnormal noise displacement of seal,the risk of abnormal friction noise of seal can be reduced in the vehicle development stage.