A system and method for active vibration control of flexible structures based on voice coil motor

Abstract

The invention discloses an active vibration control system of a flexible structure based on a voice coil motor and a method thereof, wherein the system comprises a main support rod fixed on the ground, a rail is fixed on the main support rod, left and right oblique rods on both sides of the rail are symmetrically fixed to the main support rod, left and right large displacement actuators adjacent to the left and right oblique rods are fixed on both sides of the main support rod when the rail is as a symmetry axis, both sides of the other end of the rail are symmetrically fixed with stationary fixtures on which fixed pulleys are mounted, and the top of the rail is provided with the flexible structure; the other ends of the left and right oblique rods are connected with positioning fixtures on which hole bolts are mounted, the fixed pulleys, the hole positions of the hole bolts and the left and right oblique rods are located on the same plane, and a rigid rope passes through the left large displacement actuator, the fixed pulleys and the holes of the hole bolts; besides, the invention further discloses a control method of the system; the active vibration control system outputs large displacement and greater control force through the voice coil motor, a control direction is shifted by the pulleys such that the active modal vibration control of the flexible structure can be realized.

Description

technical field [0001] The invention relates to the technical field of vibration control, in particular to an active control system and method for vibration of a flexible structure based on a voice coil motor. Background technique [0002] Voice coil motors have excellent characteristics such as simple structure, small size, light weight, high speed, high acceleration, high precision (direct drive), rapid response, and precise force control. They also have the advantages of long life and high frequency of motion. Therefore, voice coil motors are widely used in precision positioning systems such as magnetic disks and laser disc positioning, as well as active vibration isolation technology. [0003] Due to its large size, light weight, significant flexibility, and weak damping, the flexible space truss structure will inevitably be disturbed by various external and internal factors when working in space, which will cause low-frequency, nonlinear, and large-scale vibrations. Th...

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Problems solved by technology

[0003] Due to its large size, light weight, significant flexibility, and weak damping, the flexible space truss structure will inevitably be disturbed by various external and internal factors when working in space, which will cause low-frequency, nonlinear, and large-scale vibrations. The excitation will be difficult to attenuate by itself, it will interfere with the normal work of the attitude control system, and it will also seriously affect the positioning accuracy of the spacecraft

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