Magnetic bearing system multi-harmonic wave vibration inhibition method based on finite dimensional repetitive control

Abstract

The invention discloses a magnetic bearing system multi-harmonic wave vibration inhibition method based on finite dimensional repetitive control (FDRC). The method comprises following steps of firstly establishing a two-freedom degree magnetic shaft system rotor dynamics model including rotor imbalance and displacement sensor harmonic wave noise Sensor Runout; then, constructing vibration force by use of coil current and a displacement sensor signal and using the vibration force as a controlled variable of the first-order FDRC, thereby achieving same-frequency vibration force inhibition; and designing a parallel type FDRC to achieve high-order subharmonic wave vibration force inhibition, thereby finally achieving two-freedom degree magnetic bearing system harmonic wave vibration inhibition. According to the invention, effects on vibration inhibition precision and system stability caused by a low-pass filter in traditional repetitive control can be overcome; effects on vibration inhibition precision imposed by power amplification low-pass features are overcome; there is no need to additionally design a compensation loop on a power amplification system; and orders of the FDRC can be properly selected according to the vibration force of the system, so calculated quantity is reduced.

Description

Technical field [0001] The invention belongs to the field of active vibration control of magnetic bearing systems, and specifically relates to a method for suppressing multi-harmonic vibrations of magnetic bearing systems based on finite-dimensional repetitive control. Multi-harmonic vibration suppression of bearing system. Background technique [0002] With the development of super-high-resolution satellites such as super-high-resolution earth observation, astronomical observation, and inter-satellite laser communication, "super static and super stable" and agile maneuvering have become two important indicators for measuring the performance of satellite platforms. Higher and higher resolution indicators have higher and higher requirements for the pointing accuracy and attitude stability of the satellite platform, and are more and more sensitive to the vibration of the satellite platform. However, the high-frequency and low-amplitude vibration caused by the high-speed rotating i...

AI Technical Summary

Problems solved by technology

The higher the cut-off frequency of the low-pass filter, the better the suppression effect on high-frequency harmonic components, but the worse the stability of the system; conversely, the better the system stability, but the worse the suppression ability of high-frequency harmonic components

At the same time, repetitive control may amplify noise at non-harmonic frequencies to some extent

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