Multi-friction contact surface nonlinear vibration absorption-energy consumption device for momentum wheel

Abstract

The invention discloses a multi-friction-contact-surface nonlinear vibration absorption-energy consumption device for a momentum wheel. The multi-friction-contact-surface nonlinear vibration absorption-energy consumption device comprises a vibration reduction elastic piece, an auxiliary support, a mounting bolt, a tightening bolt, a mounting nut and a tightening nut. The vibration absorption mass is designed on the vibration reduction elastic piece, and vibration energy can be transferred from the momentum wheel to the vibration reduction elastic piece according to the dynamic vibration absorption principle. A horizontal non-linear friction contact surface is formed between the vibration reduction elastic piece and a spoke of the momentum wheel, a vertical non-linear friction contact surface is formed between the vibration reduction elastic piece and the auxiliary support, and efficient dissipation of vibration energy in the process of transferring the vibration energy from the momentum wheel to the vibration reduction elastic piece is achieved through the dry friction hysteresis energy dissipation effect of the multiple friction contact surfaces. Optimal control over dry friction hysteresis energy consumption can be achieved by adjusting the tightening torque for tightening the nut. The vibration absorption-energy consumption device has the advantages of being simple in structure, wide in vibration reduction frequency band, high in vibration reduction efficiency, high in load adaptability and the like, and has wide application prospects in the field of vibration control.

Description

Technical field [0001] The present invention belongs to the field of aerospace vibration control, specifically relates to a multi-friction contact surface for momentum wheel nonlinear vibration absorption - energy consumption device. Background [0002] The momentum wheel is a key mechanical component that controls the attitude of the spacecraft platform and maintains accuracy, and its working principle is to exchange angular momentum with the spacecraft through its own stored angular momentum to achieve stable flight. The vibration of the momentum wheel while in orbit directly affects the pointing accuracy, attitude stability and imaging quality of the spacecraft platform. With the requirements for the pointing accuracy of satellites and other spacecraft platforms in China to reach 0.01 ° or even arcseconds, the attitude stability reaches 10 -3 ～10 -4 (° / s), even higher 5×10 -5 ～1×10 -4 (° / s) and other continuously improved performance indicators requirements, the vibration of t...

AI Technical Summary

Problems solved by technology

[0004] The currently used dry friction shrapnel is a damping shrapnel with a single friction contact surface, which has the following limitations: (1) the number of friction contact surfaces is small, and the ability of dry friction to consume energy is limited; (2) the friction contact surface is often in contact with the damped The main vibration direction of the vibrating object is vertical, so that in the actual working process, the relative movement of the damping shrapnel in the direction of the friction contact surface is small, and the effect of dry friction hysteresis energy consumption is limited

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