A flexible multibody dynamics modeling method for a variable-configuration spacecraft

Abstract

The invention discloses a flexible multi-body dynamics modeling method of a variable configuration spacecraft. According to the topological configuration analysis of the variable configuration spacecraft, the topological structure model of the variable configuration spacecraft is established, and the cabin of the variable configuration spacecraft The modal analysis of the segment is carried out to obtain the modal information of a single segment; the kinematic analysis uses coordinates to represent the rigid body motion of the variable-configuration spacecraft and the relative deformation of the flexible segment; the kinematic recursive relationship of adjacent segments is established by using a hybrid The coordinate system method describes the motion of the variable configuration spacecraft, establishes the system dynamic equation of the variable configuration spacecraft, integrates the system dynamic equation of the variable configuration spacecraft, and takes the external force of the spacecraft as a known constraint condition to find It is necessary to describe the dynamic parameters of the variable-configuration spacecraft, and establish a flexible multi-body dynamics model for the variable-configuration spacecraft. The invention increases the versatility and stylization of the model, and reduces the model error caused by the modeling simplification assumption.

Description

technical field The invention belongs to the field of spacecraft dynamics, and relates to a topological configuration description and a dynamic modeling method of a flexible configuration-variable spacecraft. Background technique With the complexity, diversification, and suddenness of space missions, the requirements for low-cost, multi-task, and high-maneuverability are put forward for spacecraft, and the configuration-changing spacecraft has become the mainstream development direction of future spacecraft. A variable configuration spacecraft refers to a multi-chamber spacecraft that uses a large-scale cabin module stack design and can be deployed in space and self-reconfigured. The variable configuration spacecraft is a high-dimensional multi-degree-of-freedom nonlinear dynamic system, which has the characteristics of large flexibility, low stiffness, weak damping, low frequency and dense modes. The thermal environment, the simultaneous rotation of cabin modules, the vib...

AI Technical Summary

Problems solved by technology

In order to overcome the deficiencies in the prior art, the present invention provides a flexible multi-body dynamics modeling method for a variable-configuration spacecraft, which can reduce manual topology analysis, establish a topological configuration analysis method that is convenient for computer programming, and reduce the numerical value as much as possible. Simulate ill-conditioned problems

Images