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
Model updating methodologies are invariably successful when used on noise-free simulated data, but tend to be unpredictable when presented with real experimental data that are unavoidably corrupted with uncorrelated n...Model updating methodologies are invariably successful when used on noise-free simulated data, but tend to be unpredictable when presented with real experimental data that are unavoidably corrupted with uncorrelated noise content. In this paper, reanalysis using frequency response functions for correlating and updating dynamic systems is presented. A transformation matrix is obtained from the relationship between the complex and the normal frequency response functions of a structure. The transformation matrix is employed to calculate the modified damping matrix of the system. The modified mass and stiffness matrices are identified from the normal frequency response functions by using the least squares method. A numerical example is employed to illustrate the applicability of the proposed method. The result indicates that the present method is effective.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。
文摘Model updating methodologies are invariably successful when used on noise-free simulated data, but tend to be unpredictable when presented with real experimental data that are unavoidably corrupted with uncorrelated noise content. In this paper, reanalysis using frequency response functions for correlating and updating dynamic systems is presented. A transformation matrix is obtained from the relationship between the complex and the normal frequency response functions of a structure. The transformation matrix is employed to calculate the modified damping matrix of the system. The modified mass and stiffness matrices are identified from the normal frequency response functions by using the least squares method. A numerical example is employed to illustrate the applicability of the proposed method. The result indicates that the present method is effective.
