A Modeling Method for Spacecraft Dynamics

Abstract

The invention provides a spacecraft dynamics modeling method. The method comprises the following steps of: replacing a liquid sloshing equivalent mechanical model with an equivalent pendulum, enabling a closed loop topology structure to be equivalent to an open loop tree topology structure, defining a coordinate system at a hinge joint, defining a basic contact operator, characterizing elastic displacement of a flexible body, and performing recurrent calculation on the force and speed of the flexible body; and judging whether systematic calculation on a dynamics model is a forward dynamics modeling process or a backward dynamics modeling process, correspondingly substituting the forward dynamics modeling process or the backward dynamics modeling process, and deducing a system dynamics equation. The method provided by the invention is capable of not only meeting the precise modeling requirement, but also simplifying the design process, saving a lot of workload, accelerating the spacecraft development period, realizing high-precision high-efficiency dynamics modeling of a large flexible cable antenna spacecraft, achieving modeling of a flexible multi-body system capable of calculating closed loop spacecraft configuration in a simplest mode, and saving a lot of tedious and hard works.

Description

technical field [0001] The invention relates to a dynamic modeling method of a spacecraft, in particular to a dynamic modeling method for a complex flexible multi-body structure spacecraft. Background technique [0002] Dynamic modeling and analysis of spacecraft is the basis of attitude control system design. With the development of modern aerospace technology and the diversity of space missions, the structure of modern spacecraft is becoming more and more complex, which poses higher requirements and challenges for dynamic modeling and analysis. Modern complex spacecraft platforms have the following characteristics: 1. Large size and large flexible accessories, such as locked net antennas, inflatable antennas or solar film antennas; 2. Large mass, with a large amount of liquid fuel; 3. Complex structure; 4. Complex multibody motion. [0003] The most important technology in the electronic reconnaissance satellite is the ultra-large-aperture antenna technology. Since the a...

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Problems solved by technology

[0005] The invention provides a dynamic modeling method of a spacecraft, which not only meets the requirements of accurate modeling, but also simplifies the design process, saves a lot of workload, speeds up the development cycle of the spacecraft, and solves the problem of large-scale flexible cable-net antennas. For the problem of high-precision and high-efficiency dynamic modeling of spacecraft, the most simple calculation form is used to calculate the flexible multi-body system modeling of closed-loop spacecraft configuration, which saves a lot of tedious and difficult work

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