Flexible contilever plate vibration control set and control method based on acceleration sensor

Abstract

The invention discloses a flexible cantilever plate vibration control device on the basis of accelerometers and a control method. The device is symmetrically affixed with a plurality of piezoelectric ceramic sheets on the front and back surfaces of a fixed end of the flexible plate, the polarities of the two surfaces of a plurality of piezoelectric ceramic sheets are reverse, then a plurality of piezoelectric ceramic sheets are connected in parallel to compose a bending mode piezoelectric driver; the two surfaces of the longitudinal middle part of a free end of the flexible plate are anti-symmetrically affixed with a plurality of piezoelectric ceramic sheets, the polarities of the two surfaces of the piezoelectric ceramic sheets are same, then the piezoelectric ceramic sheets are connected in parallel to compose a torsional mode driver, an accelerometer A and an accelerometer B are respectively arranged at the two side angle positions of the free end of the flexible plate; the device has small weight and less wiring, which only needs the two accelerometers to be used as the sensors of the flexible cantilever plate. The method utilizes the optimized configuration of the two accelerometers and the piezoelectric driver to realize the decoupling on the detection and the driving control of the bending mode and the torsional mode of the flexible cantilever plate, thus realizing the purpose of active inhibition of multi-bending and multi-torsinal mode vibration of the flexible plate.

Description

technical field [0001] The present invention relates to vibration control of large flexible structures, in particular to a method and device for multi-mode active control of bending and torsional vibration of a space sailboard structure, and in particular to a multi-mode sensing based on multi-acceleration sensors and piezoelectric drivers. Controlled vibration control nonlinear control method and device. Background technique [0002] Large-scale complexity and flexibility are an important development trend of spacecraft structures. On the one hand, the use of large flexible accessories increases the flexibility of spacecraft design and manufacturing and reduces launch costs. On the other hand, the resulting vibration problems become more and more prominent. The modal damping of such large flexible structures is small, High-order and low-frequency intensive, especially in space sports, under the condition of environmental disturbance, its large-scale vibration will last for...

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Problems solved by technology

[0005] (2) Since the acceleration sensor signal contains a large amount of measurement noise, the signal filtering processing based on the feedback control of the acceleration sensor is problematic; and the acceleration sensor and the piezoelectric driver are generally dislocated, which will cause different modal phase differences of each order Compensation problem, robust stability problem of closed-loop control;

[0006] (3) The compensation of nonlinear factors by the control algorithm, the suppression of fast vibrations, especially the small-amplitude residual vibrations near the equilibrium point are difficult to control; the existing control methods either have high requirements on the accuracy of the model, otherwise the performance It will be greatly affected, or the amount of calculation is large, and the actual hardware real-time implementation problem is that the real-time performance is not good

Especially based on the acceleration sensor feedback to realize the rapid vibration suppression and stability of the flexible cantilever plate, it has not been well solved

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