A Flywheel Stiffness Parameter Extraction Method Based on Microvibration Waterfall Diagram

Abstract

The invention provides a flywheel rigidity parameter extraction method based on a micro-vibration waterfall plot. The method comprises the steps of: (1) building a radial kinetic model and a radial micro-vibration transmission model of a flywheel rotor; (2) testing micro-vibration during speed rise of the flywheel and generating a waterfall plot; (3) obtaining local peak value coordinates on the micro-vibration waterfall plot of the flywheel; (4) based on classification and robust regression of the coordinate data, obtaining function expressions of a mode and vortex motion curve in a full rotating speed range through fitting and performing transposition multiplying on the four expressions to obtain a structure feature polynomial; (5) obtaining an optimized target function; (6) solving thetarget function through an optimal method to obtain rigidity parameters in the radial kinetic model and the vibration transmission model of the flywheel. The method can be applied to optimal configuration of rotor structural rigidity, vortex motion and modes during flywheel design and can serve as proof for judging the consistence and the qualification of product structures in a mass production process of flywheels.

Description

technical field [0001] The invention provides a flywheel stiffness parameter extraction method, which belongs to the technical field of model parameter identification. Background technique [0002] Flywheel is the most widely used inertial attitude actuator on spacecraft, mainly composed of bearing assembly, motor assembly, wheel body assembly and shell assembly. Among them, the rotating parts in the wheel body assembly, bearing assembly and motor assembly together constitute the flywheel rotor. In view of the large number of moving parts in the rotor, there are inevitably certain manufacturing errors and rotor assembly errors in each component. On the one hand, there is a certain amount of static and dynamic unbalance in the rotor, which will generate a certain centrifugal force and force couple during high-speed rotation; There will be fluctuations in the preload during the process. These forces and moments act together as vibration sources on the flywheel rotor. When t...

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Problems solved by technology

[0004] After searching the existing technical literature, it is found that an important direction for the research on the micro-vibration characteristics of the flywheel is to study the dynamic model of the flywheel, analyze its dynamic characteristics, and simulate the micro-vibration output of the flywheel, but these model parameters have no experimental basis , the accuracy of the model needs to be improved; on the other hand, the model only stays in theoretical analysis and does not provide positive guidance for the scientific research and production of flywheel products

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