Active vibration suppression system and method for flexible truss structures based on piezoelectric materials

Abstract

The invention provides a flexible truss structural vibration active suppression system and method based on piezoelectric materials. The system comprises a main supporting rod fixed to the ground, a flexible transverse rod and flexible diagonals located on the two sides of the flexible transverse rod are fixed to the main supporting rod, an installation clamp is fixed to the main supporting rod, the other end of the installation clamp is connected with the end, on the short shaft side, of a rhombic actuator through a first rigid rope, the other end of the short shaft side of the rhombic actuator is connected with a positioning clamp fixed to one flexible diagonal through a second rigid rope, the length direction of the first rigid rope, the length direction of the second rigid rope and the length direction of the positioning clamps are located on the same straight line and perpendicular to the flexible diagonals, and the other end of the flexible transverse rod and the other ends of the flexible diagonals are connected with the body of a flexible truss structure. The invention further provides the control method of the flexible truss structural vibration active suppression system. According to the flexible truss structural vibration active suppression system and the control method of the flexible truss structural vibration active suppression system, the inverse piezoelectric effect of a piezoelectric stack is utilized to output micro displacement and large control force, a rhombic displacement amplification mechanism is used for amplifying output displacement, control is applied to the flexible truss structure, and vibration active suppression of the flexible truss structure can be achieved.

Description

technical field [0001] The invention relates to the technical field of vibration control, in particular to an active vibration suppression system and method for flexible truss structures based on piezoelectric materials. Background technique [0002] As a smart material, piezoelectric materials have been widely studied and applied in various engineering structures. It can not only generate charge output (positive piezoelectric effect) under the action of an external force field, but also generate force or displacement output (inverse piezoelectric effect) under the action of an external electric field. Therefore, piezoelectric materials are widely used in the field of sensors and actuators. has been widely used. Piezoelectric actuators utilize the inverse piezoelectric effect of piezoelectric materials. Piezoelectric actuators have been widely used in aerospace, machinery, electric power and other fields because of their high output displacement resolution, fast response, ...

AI Technical Summary

Problems solved by technology

However, due to the 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. And once it is activated, it will be difficult to attenuate by itself, which will interfere with the normal work of the attitude control system and seriously affect the positioning accuracy of the spacecraft

Images