Irregular flexible structure vibration measurement system based on multiple laser displacement sensors

Abstract

The invention discloses an irregular flexible structure vibration measurement system based on multiple laser displacement sensors. The system comprises a base, a clamping apparatus, a measurement mechanism and a processor. The measurement mechanism is mainly composed of three laser displacement sensors A, B and C and a driving assembly; the type of current vibration and displacement caused by various vibration types are determined according to displacement of each laser displacement sensor at each measurement point, whether bending vibration is generated is determined; whether torsional vibration is generated is determined; and if the vibration is neither the bending vibration nor the torsional vibration, the current vibration is identified as bending and torsion composite vibration. The system provided by the invention has the advantage of realizing synchronous measurement of bending and torsional vibration displacement of irregular plate-shaped irregular flexible structure similar to an airplane wing.

Description

technical field [0001] The invention relates to a vibration measurement system of a special-shaped flexible structure based on a multi-laser displacement sensor. Background technique [0002] The solar panels of aerospace vehicles usually exist in the space environment in the form of large cantilever beam structures, and have the characteristics of low stiffness, small damping, low natural frequency and dense low-order modes. Due to the harsh space environment, the influence of cosmic wind and particle flow, and the maneuvering of the spacecraft itself, it is very easy to cause the continuous vibration of the solar panel structure of the spacecraft. If effective suppression measures are not adopted, its large-scale vibration will last for a long time, which will not only affect the working performance of the flexible structure itself, but also affect the attitude stability and stability of the spacecraft through coupling with the main body of the spacecraft. Orientation acc...

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Problems solved by technology

[0003] In the existing technology, the research on flexible boards is mainly aimed at regular-shaped flexible boards, and the measurement method is only used to measure regular boards. However, the bending and torsional vibration of irregular-shaped board-like structures like aircraft wings However, the displacement is very small. If the existing method is used, the torsional vibration displacement of the special-shaped flexible structure cannot be measured. When two laser displacement sensors are used to measure the vibration of a similar aircraft wing plate, due to the irregular shape of the aircraft wing plate, it is impossible Find the center of symmetry of the board, and when using two laser displacement sensors to measure the vibration of the board, it is necessary to keep the two laser displacement sensors symmetrical with respect to the center of the board

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