Identification of Input Force for Reaction Wheel of Satellite by Measured Action Forceon Decelerating

Abstract

A reaction wheel is commonly used, as an important actuator, to control the attitude of a satellite.Operation of the reaction wheel plays a role of an excitation source to loading equipment inside the satellite. As requirements for environmental vibration to manifest the performance of precision equipment are getting more stringent, the research for analysis or reduction of unwanted action force in high frequency range when operating the reaction wheel is necessary. In this paper, the procedure to extract input forces and damping of a rotor system of reaction wheel is suggested. The analysis for measured action forces of reaction wheel is accomplished and important higher harmonics of action forces are determined. The input forces and damping of the rotor system are, then, extracted by curve-fitting and a particular solution for input force.

Isolation of micro-vibrations due to reaction wheel assembly using a source-path-receiver approach for quantitative requirements

“…Then, for the i -th dominant harmonics, the unknown amplitude coefficients a xi,yi,zi,θi,φi and the damping coefficient c wz,wr were estimated. As an example of the x -direction, errors between measurement and calculation are defined as follows (Shin et al., 2010; Kim, 2014): where, | F bi | is the measurement of the harmonics of the blocked forces (i.e. the one of dotted lines in Figure 3).…”

“…To calculate the vibration response of the receiver in the frequency domain, the force parameters to be estimated are a i , at dominant harmonic frequencies h i . To estimate these values, Masterson and Miller (1999), Shin et al (2010), and Kim (2014) proposed a technique from a lumped-parameter model of a flywheel-bearing system and measurements of the blocked force.…”