局部旋转惯性对转子系统动力特性的影响

The spatial location of center of mass and principal axis of inertia was utilized to describe the motion status of rotors.From the general definition of inertial load, the complete expressions of rotary inertial load were derived.Based on this, the continuous shaft model and its differential equations including the local rotary inertial load were established.Results showed that, the rotary inertia of high⁃speed⁃spinning disk can be categorized into self⁃centering of center of mass and self⁃centering of principle axis of inertia, which increases the forward processing natural frequencies and the bearing dynamic loads;the key to these influences is local angular stiffness between disk and shaft.On this basis, the reason was illustrated for the consistent increase of bearing dynamic load in high⁃speed range, while the influence of local angular stiffness between disk and shaft on the modal and response characteristics was investigated.The results above are of benefit to the vibrational fault detection and design of rotor structures during the engineering application.