Abstract To obtain the modal characteristic of multistage pump rotor in operation, the three-dimensional flow passage and the structure of the rotor for one mine emergency drainage multistage pump were established, then, based on the method of fluid-solid coupling, a model of the rotor which contains impellers and shaft was simulated with ANSYS WORKBENCH software considering the influence of both the damping and pre-stress from fluid especially. In addition, the modal of rotor was simulated without pre-stress and with different speed of revolution respectively, the characteristics of modal under different situations were obtained, and the reason for different profiles of modal was analyzed.Results show that pre-stress in the pump has a significant influence on the modal of rotor, then, the damping from fluidy has a great effect on that as well. Calculation for the modal of rotor can contribute significantly to reasonable design of multistage pump and determination of revolution.
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