Gear Meshing Characteristic Of Five-Shaft Gear Centrifugal Compressor Considering Rotor Fault

Centrifugal compressor is a typical high-speed rotating machinery, which is widely used in petrochemical, metallurgy, aerospace and other fields and also reflects the development level of the equipment manufacturing industry. The centrifugal compressor of China has not just rely on the import after years of development, but there are still many shortcomings, especially with the growing industry need of high rotating speed, variable conditions and long-term continuous operation, which means that the dynamic characteristics of centrifugal compressor need to be proved. In recent years, multi-shaft gear coupled centrifugal compressor has a lot of attention due to its high efficiency, compact structure, small footprint, etc. Multi-shaft gear rotor system is the core components of the compressor, which is the research focuses of the centrifugal compressor rotor dynamics. Due to the gear coupling effect and the nonlinear meshing force, the dynamic characteristic of the system is much more complicate and the vibration has a strong coupling characteristic. So, it is meaningful to analysis the dynamic characteristics of the multi-shaft gear rotor system to improve the performance of the compressor and the efficiency of the fault monitoring.In this paper, the multi-shaft integral gear assembly centrifugal compressor is taken as a research object. The dynamic model is established by the method of concentrated mass method and ADAMS, and the unbalanced responses and the dynamic characteristics of the system under the shaft deviation are analyzed based on it. The main work of this paper includes:(1) The multi-shaft integral gear assembly centrifugal compressor test rig gear dynamic model is established by the method of concentrated mass method and ADAMS, the multi-body dynamic model is validated from three aspects:rotating speed, meshing force, natural characteristics.(2) The unbalanced response of the system under different condition is simulated based on the multi-body dynamic model, and the gear-coupling effect is considered. The meshing forces and the vibration response of the supporting point is obtained.(3) The gear-shaft deviation multi-body dynamic model is build according to the definition of gear-shaft deviation. The meshing force and the supporting force under the deviation fault is obtained considering load and the amount of deviation.This thesis take multi-shaft integral gear assembly centrifugal compressor as a research object, which provides theoretical basis to the optimization design of centrifugal compressor and fault detection and diagnosis.