Mechanical frequency modulation type dynamic absorber for satellite flywheel

Abstract

The invention relates to a mechanical frequency modulation type dynamic absorber for a satellite flywheel. A guide rod is vertically fixed to the center of a bottom plate. A shock absorption mass block horizontally moves in the axial direction of the guide rod through a linear bearing. Linear modules are symmetrically arranged on the two sides of the guide rod. The mechanical frequency modulation type dynamic absorber comprises a guide rail, a ball screw, a ball nut sliding block, a leaf spring assembly and a motor connection seat, wherein the guide rail is fixed to the bottom plate, the ball screw is arranged on the guide rail, the ball nut sliding block is arranged on the ball screw, the leaf spring assembly is connected between the shock absorption mass block and the ball nut sliding block. The motor connection seat is fixed to one end of the guide rail. By adoption of the symmetrical structural design, the inherent structure frequency is adjusted according to the mechanical frequency modulation principle and changes of the rotation speed of the flywheel, vibration of the flywheel is controlled and restrained to a low order, stability and reliability of the on-satellite high-accuracy sensitivity load in-orbit operation are ensured, and the mechanical frequency modulation type dynamic absorber has the advantages that the frequency tracing speed is high, the vibration absorption performance is excellent, the structure is simple, reliability is high, assembly is convenient, and the manufacturing cost is low.

Description

technical field [0001] The invention relates to a dynamic vibration absorber, in particular to a mechanical frequency modulation dynamic vibration absorber for a satellite flywheel. Background technique [0002] With the development of my country's satellites in the direction of high precision, high stability, and long life, the sensitive loads carried by them have higher and higher requirements for the micro-vibration environment of the satellite platform. Flywheel vibration is the main factor affecting the performance of satellite payloads, so it is very urgent to suppress flywheel vibration. Commonly used flywheel vibration control methods include damping, structural rigidity, vibration isolation, and so on. The effect of damping and vibration reduction is only obvious when it is in resonance; structural rigidity will increase the mass of the satellite; passive vibration isolation reduces the stiffness of the connection between the load and the platform, and reduces the ...

AI Technical Summary

Problems solved by technology

The effect of damping and vibration reduction is only obvious when it is in resonance; the rigidity of the structure will increase the mass of the satellite; passive vibration isolation reduces the connection stiffness between the load and the platform, and reduces the load pointing accuracy; active vibration isolation has high energy consumption and poor stability

[0003] After searching the literature of the prior art, it is found that there is no mechanical frequency-modulated dynamic vibration absorber for satellite flywheels. The design constraints of the mechanical frequency-modulated dynamic vibration absorber mainly include three aspects: First, the frequency adjustment of the dynamic vibration absorber should be expanded The second is to reduce the vibration response amplitude of the flywheel mounting plate during on-orbit operation; the third is to realize the optimized design of the vibration-absorbing mass and the envelope size of the spring to increase the stability, reliability and safety of the structural performance

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