A six-degree-of-freedom active landing buffer device and control method for a spacecraft

Abstract

The invention discloses a six-degree-of-freedom active landing buffer device for a spacecraft and a buffer control method. The buffer device is composed of a platform and buffer legs. The platform is connected with 3 sets of buffer legs in the same state, and simultaneously bears the structural weight of the spacecraft. The buffer leg has 3 degrees of freedom, and its end can move arbitrarily in three-dimensional space. When the spacecraft lands on the rough ground with any attitude, the buffer device calculates the buffer force and moment required by the spacecraft fuselage according to the attitude and speed of the spacecraft fuselage. According to the configuration of the buffer legs at the time of contact with the ground, the buffer force and moment of the spacecraft fuselage are distributed to each buffer leg. By controlling the electric current of the joint motor of the cushioning leg, the foot end of the cushioning leg produces the required cushioning force. The buffer device proposed by the invention can maintain the stability of the attitude of the spacecraft fuselage while dissipating the landing kinetic energy of the spacecraft, and realize the soft landing of the spacecraft in any terrain environment.

Description

technical field [0001] The invention belongs to the technical field of spacecraft, and in particular relates to a six-degree-of-freedom active landing buffer device and a control method for a spacecraft. Background technique [0002] At present, most spacecraft landing buffer devices are realized by passive control technology. 3-support or 4-support landing buffer legs are installed on the bottom of the spacecraft. The landing buffer legs convert the kinetic energy of the spacecraft into plastic deformation energy by using buffer materials to achieve a soft landing on the surface of the planet. Due to the plastic material used, the landing pad legs cannot be reused. In addition, the landing buffer legs equipped with the current spacecraft all adopt passive control technology. During the launch phase, the landing buffer legs are in a retracted and compressed state to meet the envelope requirements of the launch. Before landing, the landing pad legs are released to deploy an...

AI Technical Summary

Problems solved by technology

Since the passively controlled landing buffer legs do not have active movement functions, and the configuration of the legs cannot be adjusted according to the terrain characteristics, the current spacecraft landing buffer devices cannot adapt to the rugged landing terrain, and cannot meet the requirements of the extreme terrain of the planetary surface by future deep space probes. Regional Reliable Landing Requirements

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