Abstract
AbstractSpace manipulators are typically installed on spacecraft using an emergency separation device (ESD). In the event of a malfunction, the ESD ejects the manipulator from the spacecraft. However, due to the relative rotation of the manipulator’s joints during the ejection, the equivalent ejection mass varies depending on different attitudes. This paper focuses on studying manipulators equipped with separation slide rails and analyzes their ejection characteristics under different attitudes to determine the optimal manipulator attitude for ejection. Initially, the ejection dynamics model of the space manipulator is established using the Lagrangian method, based on the kinetic energy equation, kinematics equation, and the boundary condition between the manipulator and ESD. Afterward, the space dynamics model is transformed into the dynamic model of plane ejection state by recursion formula. From this model, the equivalent ejection mass and ejection velocity are obtained, and the joint angular variation during ejection is acquired by considering joint friction torque. Using the law of conservation of angular momentum, the ejection angular velocity is then calculated. Finally, this study selected a 7-DOF space manipulator as an example and adjusted the damping parameter B of the joint for more precise calculations by choosing the attitude with a relatively larger joint angular variation. The modified model was then tested for its applicability to other attitudes. After determining the value of B, the correctness of the algorithm was validated by MATLAB calculation, ADAMS simulation, and real object ejection test.
Publisher
Cambridge University Press (CUP)
Subject
Computer Science Applications,General Mathematics,Software,Control and Systems Engineering,Control and Optimization,Mechanical Engineering,Modeling and Simulation,Artificial Intelligence,Computer Vision and Pattern Recognition,Computational Mechanics,Rehabilitation
Reference25 articles.
1. Prospect of airline-flight-mode aerospace transportation system;Bao;Astronaut. Syst. Eng. Technol.,2021
2. Water bouncing robots: a first step toward large-scale water running robots
3. [15] Yoshida, K. and Sashida, N. , “Modeling of impact dynamics and impulse minimization for space robots,” In: IEEE/RSJ Intemational Conference on Intelligent Robots and Systems (IEEE, 1993) pp. 2064–2069.
4. Automatic mass balancing of air-braing-baesd three-axis rotational spacecraft simulator;Jae;J. Guid. Control Dyn.,2009
5. Research on separation strategy and deployment dynamics of a space multi-rigid-body system;Luo;Chin. J. Theor. Appl. Mech.,2020