发动机燃油泵附件的管路动力学等效设计及实现

Dynamic equivalent design and realization of the pipeline of engine fuel pump accessory

燃油泵附件的管路空间构型复杂,在振动环境试验中直接模拟难以实现。为满足试验要求,采用系统等效缩减/扩展过程(SEREP)方法对管路进行动力学等效设计,选取管路上特定结点为主自由度,并将原管路模型缩减至主自由度模型上,得到缩减质量和刚度矩阵;对子振型矩阵采用SVD分解,使得缩减质量和刚度矩阵进一步简化,得到低阶管路模型的新缩减质量和刚度矩阵参数;提出“质量球—梁弹簧”结构模型,分别用“质量球”和“梁弹簧”来映射缩减的质量和刚度矩阵,进而确定等效设计加工参数;通过实例验证等效设计方法的可行性。结果表明:等效管路与原管路的第一阶频率误差大多在10%以内,满足工程应用要求。

The pipeline space configuration of fuel pump accessory is complex,and it is difficult to simulate directly in vibration environment test.In this paper,the system equivalent reduction expansion process(SEREP)is used for the dynamic equivalent design of the pipelines to meet the test requirements.By selecting the specific nodes on the pipeline as the main DOFs,and reducing the original pipeline model to the main DOFs model,the reduced mass and stiffness matrix are obtained.The sub-mode matrix is decomposed by SVD to further simplify the re-duced mass and stiffness matrix,then the new reduced mass and stiffness matrixes of low-order pipeline model are obtained.The"mass ball-beam spring"structure model is proposed,which maps the reduced mass and stiffness ma-trices using"mass ball"and"beam spring"respectively,thereby determining equivalent design and processing pa-rameters.Finally,the implementation of the equivalent design method is verified through examples,and the first frequency error between the equivalent pipeline and the original pipeline is mostly within 10%,meeting the require-ments of engineering applications.