工况传递路径技术(operational transfer path analysis,OTPA)可以根据运行工况下的振动数据对故障进行溯源分析,该方法需要有大量不同工况下的运行数据,这对于航空发动机等很多旋转机械而言是不现实的。为解决运行工况数量不足问题,提...工况传递路径技术(operational transfer path analysis,OTPA)可以根据运行工况下的振动数据对故障进行溯源分析,该方法需要有大量不同工况下的运行数据,这对于航空发动机等很多旋转机械而言是不现实的。为解决运行工况数量不足问题,提出一种基于频响函数的工况传递路径分析方法。以航空发动机转子试验台为例,试验获取整机状态下激励点到轴承座和机匣测点的频响函数矩阵,将其作为OTPA模型的输入和输出,通过奇异值分解技术消除输入之间的串扰导致的矩阵病态,进而求出传递率矩阵。根据传递率系数确定机匣各部位对各轴承座的振动敏感度,根据振动贡献量确定机匣振动来源。在航空发动机双转子试验台上开展了试验研究,验证了该方法的可靠性。展开更多
To analyze a multibody system composed of non-uniform beam and spring-mass subsystems, the model discretization is carried on by utilizing the finite element method（FEM）, the dynamic model of non-uniform beam is dev...To analyze a multibody system composed of non-uniform beam and spring-mass subsystems, the model discretization is carried on by utilizing the finite element method（FEM）, the dynamic model of non-uniform beam is developed by using the transfer matrix method of multibody system（MS-TMM）, the transfer matrix of non-u- niform beam is derived, and the natural frequencies are computed. Compared with the numerical assembly method （NAM）, the results by MS-TMM have good agreement with the results by FEM, and are better than the results by NAM. When using the high precision method, the global dynamic equations of the complex multibody system are not needed and the orders of involved system matrices are decreased greatly. For the investigation on the re- verse problem of the physical parameter identification of multibody system, MS-TMM and the optimization tech- nology based on genetic algorithms（GAs） are combined and extended. The identification problem is exchanged for an optimization problem, and it is formulated as a global minimum solution of the objective function with respect to natural frequencies of multibody system. At last, the numerical example of non-uniform beam with attach- ments is discussed, and the identification results indicate the feasibility and the effectivity of the proposed aop- proach.展开更多
文摘工况传递路径技术(operational transfer path analysis,OTPA)可以根据运行工况下的振动数据对故障进行溯源分析,该方法需要有大量不同工况下的运行数据,这对于航空发动机等很多旋转机械而言是不现实的。为解决运行工况数量不足问题,提出一种基于频响函数的工况传递路径分析方法。以航空发动机转子试验台为例,试验获取整机状态下激励点到轴承座和机匣测点的频响函数矩阵,将其作为OTPA模型的输入和输出,通过奇异值分解技术消除输入之间的串扰导致的矩阵病态,进而求出传递率矩阵。根据传递率系数确定机匣各部位对各轴承座的振动敏感度,根据振动贡献量确定机匣振动来源。在航空发动机双转子试验台上开展了试验研究,验证了该方法的可靠性。
基金Supported by the National Natural Science Foundation of China(10902051)the Natural Science Foundation of Jiangsu Province(BK2008046)~~
文摘To analyze a multibody system composed of non-uniform beam and spring-mass subsystems, the model discretization is carried on by utilizing the finite element method（FEM）, the dynamic model of non-uniform beam is developed by using the transfer matrix method of multibody system（MS-TMM）, the transfer matrix of non-u- niform beam is derived, and the natural frequencies are computed. Compared with the numerical assembly method （NAM）, the results by MS-TMM have good agreement with the results by FEM, and are better than the results by NAM. When using the high precision method, the global dynamic equations of the complex multibody system are not needed and the orders of involved system matrices are decreased greatly. For the investigation on the re- verse problem of the physical parameter identification of multibody system, MS-TMM and the optimization tech- nology based on genetic algorithms（GAs） are combined and extended. The identification problem is exchanged for an optimization problem, and it is formulated as a global minimum solution of the objective function with respect to natural frequencies of multibody system. At last, the numerical example of non-uniform beam with attach- ments is discussed, and the identification results indicate the feasibility and the effectivity of the proposed aop- proach.
