航空发动机机匣螺栓连接结构简化模型修正

Simplified Model Updating of Bolted Connection Structure of Aeroengine Casing

为了提高航空发动机机匣螺栓连接结构动力学模型修正效率,基于模态置信准则(MAC),提出了一种基于实体振型的动力学参数简化模型修正技术,采用该技术对发动机机匣典型螺栓连接结构有限元参数模型进行了修正。通过模态测试获得实际机匣的模态信息,并与有限元实体模型模态进行比较,利用实体模型模态信息筛选修正参数,采用参数化响应面优化方法对机匣动力学简化模型进行修正。结果表明:基于实体振型的动力学参数简化模型修正技术可以避免对模型进行多次调用,提高了简化模型修正效率;具有较高的修正精度,修正后的典型螺栓连接结构简化模型准确性明显提高约11%。该修正技术进一步完善后可用于航空发动机整机动力学分析、故障分析等。

In order to improve the efficiency of dynamic model updating of bolted connection structures of aeroengine casing,a simplified model updating technique based on solid mode shape was proposed based on modal assurance criterion(MAC),and the finite element parameter models of typical bolted connection structures of aeroengine casings were updated by this technique.The modal informa⁃tion of the actual casing is obtained through modal testing,and compared with the modes of the finite element solid model.The modal information of the solid model is used to screen the updating parameters,and the simplified casing dynamic model is updated by the parametric response surface optimization method.The results show that the simplified model updating technology of dynamic parameters based on solid model vibration modes can avoid multiple calls to the model and improve the updating efficiency of the simplified model.The accuracy of the updated simplified model of a typical bolted connection structure is significantly improved by about 11%.After further improvement,the updating technology can be used for dynamic analysis and fault analysis of aeroengines.