Method for measuring dynamic stiffness of flywheel bearing

Abstract

The invention discloses a method for measuring dynamic stiffness of a flywheel bearing. The method is characterized by comprising the following steps of installing a flywheel to be tested on a micro-vibration test platform, driving the flywheel to the maximum rotating speed and then carrying out inertial parking, and acquiring a three-way disturbing force signal in the entire operating state through an acquisition system; performing fast Fourier transform on an acquired time domain signal, drawing a flywheel three-way rotating speed spectrogram, and extracting the radial translation frequencyand the axial translation frequency of a rotor through the amplitude; respectively extracting high-order harmonic amplitude data resonated and amplified with radial and axial translational modals on x-direction and z-direction rotating speed spectrograms, and fitting the data to obtain a radial damping coefficient and an axial damping coefficient according to an amplitude function; and calculatingto obtain the radial dynamic stiffness and the axial dynamic stiffness of the flywheel bearing. According to the method for measuring dynamic stiffness of a flywheel bearing provided by the invention, dismounting and destruction of the structure can be avoided by adopting indirect measurement, and the method has the beneficial effects of being simple in calculation, non-invasive, and real-time and visual in results.

Description

technical field [0001] The invention relates to a method for measuring the dynamic stiffness of a flywheel bearing, belonging to the technical field of engineering measurement and calculation. Background technique [0002] Rotating machinery is one of the most widely used equipment in modern industry, and its condition monitoring and fault diagnosis have become the most critical parts in system design and maintenance. As a typical rotating machine, the flywheel consists of a moving rotor, supporting bearings, and a protective cover, and is mainly used for attitude control of spacecraft. When studying the flutter characteristics of satellites, it is often necessary to obtain the relevant characteristic parameters of the flywheel. [0003] Usually, the bearing stiffness of the flywheel is provided by the bearing manufacturer, and the common measurement method is to establish a stiffness measurement model based on the change of the force and the change of the corresponding dis...

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Problems solved by technology

[0005] The problem to be solved by the present invention is: the existing method of measuring the dynamic stiffness of the flywheel bearing must disassemble the flywheel structure, which is easy to cause damage to the original assembly characteristics, and requires specific high-precision measuring equipment, resulting in unnecessary waste of manpower and material resources, and cannot monitor in real time The problem

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