Active weight compensation system

Aeronautical and Space-Rocket Engineering


Аuthors

Maksimov V. N.1, 2*, Maksimov P. N.1, 2**, Kondratyev K. V.1***

1. Compani «Information satellite systems of academician M.F. Reshetnev», 52, Lenin str., Zheleznogorsk, Krasnoyarsk region, 662972, Russia
2. Siberian State University of Science and Technology named after academician M.F. Reshetnev, 31, Krasnoyarsky Rabochy av., Krasnoyarsk, 660014, Russia

*e-mail: 1928d@mail.ru
**e-mail: 1528d@mail.ru
***e-mail: kondratevkv@iss-reshetnev.ru

Abstract

The presented article considers the development and design of the active weight compensation system developed at the M.F. Reshetnev Information Satellite Systems JSC. The system is being intended for modal tests of the low-frequency and poorly damped structures, ensuring conditions close to the weightlessness.
The system operating principle is based on the magnetic field and electrodynamic forces interaction. It basic components include both moving and stationary parts. The moving element is equipped with the copper coil, connected to the voltage source. As the electric current passes through, the Ampere force is being generated, which causes the element to move along the vertical axis. The system attains equilibrium when this force fully compensates the gravitational impact.
PID-regulator, which allows accurate correction of the current fed to the coil depending on the moving element position, is being employed for the system adjustment. This ensures stable weight compensation and the object sustaining in the state close to weightlessness. The article presents the plot of current dependence on the element position, as well as describes the control signal scaling method for various masses of the movable element.
The authors conducted experiments, which analyze the PID-regulator transient and evaluate the system viscous friction coefficient. The Ampere’s force dependence on the element position, as well as characteristic of the magnetic field in the conductor were determined in the course of the tests. The obtained data allowed control algorithms clarifying and control accuracy enhancing.
The developed system for active weight compensation demonstrated its efficiency and the possibility of its application in the space-rocket industry. The future studies will be aimed at the control algorithms updating, reducing impact of the magnetic field nonlinear effects and system operation accuracy enhancing. The presented technology may be worthwhile for modal tests of various structures, which require weightlessness imitation.

Keywords:

aerostatic bearing, modeling, MATLAB, electrodynamics, active weight compensation systems

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