| As the turbine-generator unit and other large equipment were increasingly slenderized and more complex, the support points of rotor are increasing. The rotor system condition monitoring and fault diagnosis is also putting forward higher requirements. Bearing load in the multi-support rotor system is an important factor that affects the stability of the axis, while the change in bearing load has the coupling effect on the vibration of the supports of rotor. Vibration diagnostic techniques can diagnose the self-excited vibration results from the axis vibration instability, but for the self-excited vibration sources of multi-support rotor aren't recognized. That brings great difficulties in the repairing and adjustment of the equipment. This paper's research object is a large turbine generator's core component, multi-support rotor system. It focuses on the coupling characteristics between the bearing load changes and system vibration. On the one hand, these results enrich the rotor system vibration diagnostic techniques, on the other hand they provide a foundation for the recognition of the self-excited vibration sources of the multi-support rotor system.In this paper, it proposed the recognition model of the bearing radial position (horizontal and vertical) through the theoretical analysis. Firstly, it had a simplified model of the multi-support rotor system by lumped mass. On the base of this, the static and dynamic bearing load distribution formula are obtained through the transfer matrix. Secondly, it got the sensitivity matrix through the study of the impact of the support bearing loads between the change of the location of the bearings and the bearing load. Finally, it established the identification model of the bearing location and the bearing load by using the sensitivity matrix.This paper studied how implemented the bearing load condition monitoring in the test. Real-time monitoring of the bearing load is the most direct and effective means of monitoring for axis running condition. However, due to the installation constraints, it had the difficulties in the on-site monitoring of the bearing load condition. To study the coupling relationship between the bearing load and vibration in the multi-support rotor system, we studied the real-time monitoring of the bearing load condition and analyzed the possibilities of the dynamic measuring of the bearing load. In the paper, it proposed the indirect measurement of achieving the dynamic measurement of the bearing load. This paper described a bearing load sensor. To get the static characteristics performance index, we did a lot of calibrating experiments and the regression analysis. To get the dynamics characteristics performance index, we carried out the sampling analysis, virtual experiments and finite element analysis. We focused on the rotor system dynamics effects of the installation of the sensor. Finally, it had the experimental verification on the multi-support rotor test.The paper proposed the coupling effects on the rotor system vibration because of the change of multi-support bearing load. It carried on the dynamic analysis of the bearing load changes under the two kinds of the interference. That is the case of the bearing's location change and torque disturbance. That examined the transfer of vibration between the support points and established a coupling vibration model between the bearing load and the rotor system and did the numerical analysis through the Runge-Kutta methods. That did the modeling system of the8support rotors with the help of the ANSYS software and calculated the critical speed of the system. For the two sides of position changes of the flexible and rigid rotor system and the vibration characteristics of the support points, we did a dynamic analysis and simulation and got the axis orbit features of all the support points. In addition, it proposed the fuzzy recognition method of the radial position of the bearing by using the axis orbit trajectories.8support rotor system test bed was established and radial position changes and torque disturbances of the bearing was simulated. That got the different values of bearing load, vibration characteristics and the axis orbit trajectories. In the end that did a lot of experimental verification of the identification of the bearing's radial location and coupling characteristics by the test results. |
