A Disturbance Observer Based Hybrid Sail Period Orbit Keeping Method for Earth-Moon System

A technology that interferes with observers and periodic orbits, applied in the field of aircraft control, can solve problems such as no reliable solutions, and achieve the effects of simple structure, reduced fuel consumption, and improved track maintenance accuracy

Active Publication Date: 2022-02-08
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

There is currently no reliable solution

Method used

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  • A Disturbance Observer Based Hybrid Sail Period Orbit Keeping Method for Earth-Moon System
  • A Disturbance Observer Based Hybrid Sail Period Orbit Keeping Method for Earth-Moon System
  • A Disturbance Observer Based Hybrid Sail Period Orbit Keeping Method for Earth-Moon System

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Embodiment Construction

[0063] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0064] see figure 2 , the present invention is based on the interference observer and the earth-moon system hybrid sail period orbit keeping method comprises the following steps:

[0065] Step 1: Establish the relative orbital motion dynamics equation of the solar sail of the Earth-Moon system.

[0066] in such as figure 1 In the shown Earth-Moon system rendezvous coordinate system, the dynamic equation of the hybrid sail is:

[0067]

[0068] In the formula: a=[a x a y a z ] T , a is the dimensionless acceleration of the mixed sail; U is the equivalent potential function, and

[0069]

[0070] where μ is the mass parameter of the Earth-Moon system.

[0071] Order r ref =[x ref the y ref z ref ] T Indicates the mixed sail reference trajectory, δr=[δx δy δz] T Denotes the controlled trajectory r c with the reference trajectory r ref ...

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Abstract

A method for maintaining the periodic orbit of the hybrid sail of the Earth-Moon system based on a disturbance observer, including steps: 1) Establishing the relative motion dynamics equation of the hybrid sail orbit of the Earth-Moon system in the Earth-Moon system's rendezvous coordinate system; 2) In the Earth-Moon system In the CRTBP model, a disturbance force model is established for the eccentricity of the lunar orbit and the gravitational disturbance of the sun; 3) determine the linear period state feedback rate, and design the orbit maintainer with the optimal period; 4) design a nonlinear disturbance observer to make the nonlinear disturbance observation 5) According to the changing law of the mass of the hybrid sail, the particle swarm optimization algorithm is used to optimize the acceleration of the electric propulsion. The orbit keeper with the optimal period of the invention has the advantages of simple structure and strong robustness, and the nonlinear disturbance observer can improve the orbit keeping accuracy. The invention reduces fuel consumption of the electric propulsion system and prolongs the working life of the system.

Description

technical field [0001] The invention belongs to the field of aircraft control, and in particular relates to a periodic orbit keeping method for a hybrid sail of an earth-moon system based on a disturbance observer, aiming to make full use of the orbit keeping ability of a solar sail, optimize the thrust of an electric propulsion system, and save fuel. Background technique [0002] Compared with traditional spacecraft, solar sails use solar light pressure to obtain continuous small thrust without fuel and have the advantages of high load ratio, so their application potential in Earth-Moon space missions is huge. However, due to the perturbation of the earth-moon space environment and the instability of the orbit of the pivot point, the solar sail needs to actively control the orbit to achieve high-precision maintenance of the mission orbit. [0003] The previous theoretical research on solar sails in the Earth-Moon system mainly focused on the design and control of the suspen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 袁建平高琛袁静张军华李琪王伟
Owner NORTHWESTERN POLYTECHNICAL UNIV
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