基于扩展工况传递路径分析的驾驶室振动传递路径二级建模应用研究

Transfer path two-level modeling for cab vibration based on OPAX method

阐述了OPAX方法的基本理论,对某中型卡车驾驶室振动实施传递路径分析,并针对该车结构设计特点,提出基于OPAX方法的二级TPA分析模型,分别为动力总成-驾驶室一级传递路径模型和车架-驾驶室二级传递路径模型。通过建模测试计算获得各级悬置动刚度、工况载荷和路径贡献量,准确定位引起驾驶室振动水平较大的原因,提出改进方案,有效减小驾驶室振动水平。该应用研究表明二级TPA模型更符合研究对象的结构设计,能反映出更详尽的结构路径特性,是对已有TPA模型的丰富和拓展,对OPAX方法的工程应用具有重要的借鉴意义。

The basic theory of OPAX method was presented,and transfer path analysis( TPA) for a medium-sized truck cab vibration was done. A two-level TPA model including a powertrain-cab 1 st level TP model and a frame-cab 2 nd level TP model based on OPAX method was proposed according to structural design features of the truck. The dynamic stiffness,operating load and path contribution of various mount components were obtained with tests and calculations.They were used to correctly judge causes of the cab's higher vibration level and propose an improved scheme to effectively reduce the cab's vibration level. The results showed that the improved two-level TPA model can more fit the structure design of the study object and reflect the structure path characteristics in detail; the new model enriches and extends the existing TPA model and provides a reference for the application of OPAX method.