Method for holding hybrid sail periodic orbit of earth-moon system based on disturbance observer

A technology that interferes with observers and periodic orbits, applied in the field of aircraft control, and can solve problems such as no reliable solutions yet

Active Publication Date: 2019-01-11
NORTHWESTERN POLYTECHNICAL UNIV
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  • Method for holding hybrid sail periodic orbit of earth-moon system based on disturbance observer
  • Method for holding hybrid sail periodic orbit of earth-moon system based on disturbance observer
  • Method for holding hybrid sail periodic orbit of earth-moon system based on disturbance observer

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[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 holding a hybrid sail periodic orbit of an earth-moon system based on a disturbance observer comprises the following steps of: 1) establishing a relative motion dynamics equation of the hybrid sail orbit of the earth-moon system under the coordinate system of the earth-moon system; 2) establishing an disturbance force model for a lunar orbit eccentricity and a solar gravity disturbance in the CRTBP model of the earth-moon system; 3) determining a linear period state feedback rate, and designing a periodically optimal orbit holder; 4) designing a nonlinear disturbance observer to converge the error index of the nonlinear disturbance observer into a closed ball with a finite radius; and 5) using the particle swarm optimization algorithm to optimize the electric propulsion acceleration according to the variation law of the hybrid sail mass. The periodically optimal orbit holder provided by the invention has the advantages of simple structure and strong robustness. Nonlinear disturbance observers can improve the orbit retention accuracy. The method reduces the fuel consumption of the electric propulsion system, and prolongs the service 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...

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Application Information

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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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