Space debris recovery control method based on tethered technology

Abstract

The invention discloses a space debris recovery control method based on a tethered technology. The space debris recovery control method is characterized by comprising the following steps that 1, the tether elasticity is considered, a space tethered debris system is researched by adopting an elastic rod module, and a system dynamics differential equation is built according to a class II Lagrange equation; 2, the system dynamics equation in the step 1 is rewrote into a non-dimensional system dynamics equation; 3, the in-surface outer pivot angle vibration abatement problem of nonlinear time-varying system dynamics equation in the recovery process is researched, and the tether length change analysis control law and the in-surface pitch angle value range in the expectation equilibrium position in the debris recovery process are inferred; and 4, the stability of the system and the value range, keeping stable asymptotically, of a pitch angle in an expectation surface are further analyzed through the Floquet theory. Through the space debris recovery control method, the effect that debris is stably recovered nearby an on-orbit spacecraft can be ensured, and meanwhile the safety in the recovery process especially the safety in the end time can be ensured.

Description

technical field [0001] The invention belongs to the field of spacecraft control, in particular to a space debris recovery control method based on tether technology. Background technique [0002] With the increasing frequency of human cosmic activities, space debris, mainly spacecraft debris, left near the earth's orbit has increased sharply, which will definitely pose a great threat to the operation of spacecraft in orbit. It is imperative to recover and clean up these space debris. must do. Therefore, the debris recovery technology based on space tether has aroused great interest of scientific researchers. For example, Zhong Rui et al. derived a set of linear feedback control laws based on the stability theory of the linear autonomous tether system, which can realize the stable recovery of the space tether system (China Space Science and Technology, 2009, 29(6): 66-73). Based on a time-varying degree of freedom flexible rope model close to the real tether system, Yu et al...

AI Technical Summary

Problems solved by technology

[0003] By paying attention to previous research results, it can be found that optimal control (such as optimal energy and optimal time) can complete the recovery task of tether debris under the condition of satisfying various constraints, but this will consume a lot of computing resources and time , and only numerical results can be obtained, and an analytical control law cannot be obtained

On the other hand, some analytical pull control laws have also been proposed, but they are usually only applicable to the tethered debris system operating in the Kepler orbit with a small eccentricity, and will no longer be applicable once the orbital eccentricity increases

In addition, part of the recovery control law is designed based on a linearized system, which obviously deviates greatly from the nonlinear tethered debris system in actual engineering tasks

Images