Low frequency modal vibration control apparatus and method for simulating bending and torsion for space sailboard

Abstract

The invention discloses a device for controlling vibration when simulating the bending and torsional low-frequency modes of a space sailboard, and a method thereof. The device is stuck with a resistance strain gauge on a flexible cantilever plate close to a longitudinal center line of a fixed end with an attitude angle of 0 degree to serve as a bending mode sensor and multi-way shape memory alloy (SMA) springs are symmetrically arranged on the front surface and the rear surface of the flexible plate, with the attitude angle of 0 degree, to serve as a bending mode piezoelectric actuator. Two resistance strain gauges are anti-symmetrically and bilaterally stuck on the flexible plate close to a free end, with the attitude angle of 45 degrees, to form a torsional mode sensor, and four shape memory alloy springs are anti-symmetrically and bilaterally stuck close to the free end to form two paths of torsional mode drivers with opposite phases. The device and the method utilize the optimized allocation of the SMA springs, realize the decoupling of the bending and torsional low-frequency vibrating modes of a large cantilever plate and the purpose of actively controlling the bending mode and the torsional mode of the flexible cantilever plate.

Description

technical field [0001] The invention relates to the vibration control of a large flexible cantilever plate structure, in particular to an active control device and method for bending and torsional low-frequency modal vibrations for simulating a space sailboard structure, and specifically provides a cantilever for simulating a flexible space sailboard The flexible plate structure is based on the optimal configuration of the resistance strain gauge sensor and the shape memory alloy (SMA) spring driver to realize the active control device and method of bending and torsional low-frequency modal vibration. Background technique [0002] With the rapid development of aerospace technology, new requirements are put forward for the performance of space structure systems. Large-scale, low rigidity and flexibility are an important development trend of spacecraft structure. Large structures can increase the functions of space structures. On the one hand, the use of large flexible access...

AI Technical Summary

Problems solved by technology

The piezoelectric material PZT has a wide frequency band, large output, but small deformation; piezoelectric ceramic material (PZT) has the advantages of precise control, easy distribution, and fast response speed, but the control force is low, and only fine-tuning can be achieved, and large adjustments cannot be made. deformation adjustment

Using the above-mentioned sensors and drivers can achieve better results in the frequency bandwidth range of a few tenths to tens of Hz relative to the frequency; however, the frequency of the low-frequency vibration modal vibration of a large flexible space sail is lower than 0.1 Hz, so The application of the above-mentioned sensor and driver control will have limitations in bandwidth, and the effect is not obvious

The advantage of the shape memory alloy material SMA driver in smart materials is that it has a large control force, can realize various forms, large deformation, large driving force when heated and driven, and high strain sensitivity; the disadvantage is that the response speed is slow and the driving frequency bandwidth is average. Less than 0.1Hz, difficult to use for fast dynamic control, use SMA for active control of extremely low frequency vibration

Professor Zhu Xiaojin of Shanghai University applied for a related patent, the patent application number is 200710040519.2, and the title of the invention is "A method and device for active control of low-frequency modal vibration of space sailboard structure based on form perception". The shape is sensed in real time, and a control strategy is generated based on the perceived structural vibration information to drive the shape memory alloy to achieve the corresponding purpose of eliminating or reducing structural vibration; however, the bending and torsional vibration modes of the flexible cantilever plate are not given in the patent application The decoupling problem of , does not mention the driving control of torsional mode vibration

Moreover, the fiber grating network signal instrument is expensive, and the cost of the system is greatly increased

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