Modeling and validation of reaction wheel micro-vibrations considering imbalances and bearing disturbances

Alkomy, Hassan; Shan, Jinjun

doi:10.1016/j.jsv.2020.115766

Cited by 20 publications

(8 citation statements)

References 25 publications

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“…The model is rather detailed but the influence of RW imbalances on satellite attitude dynamics is not investigated. Similar results supplemented by experiments are obtained in [16][17][18][19][20]. In the study of [21], the numerical study of the imbalance effect is presented.…”

Section: Introductionsupporting

confidence: 73%

Effect of Reaction Wheel Imbalances on Attitude and Stabilization Accuracy

et al. 2021

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In this paper, the study of stabilization accuracy of a satellite equipped with a set of reaction wheels (RW) is presented. The model of motion takes into account possible static and dynamic reaction wheel imbalances. Due to the complexity of the model, which leads to the numerical issues, the effects of dynamic and static imbalances on inertial stabilization are studied analytically. As a result, estimations of the attitude and stabilization accuracy are presented in closed form.

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Section: Introductionsupporting

confidence: 73%

Effect of Reaction Wheel Imbalances on Attitude and Stabilization Accuracy

et al. 2021

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“…Because of the lesser system stiffness (or considerably heavier mass) that a lower resonance frequency implies, the loading capacity is also decreased (or a cumbersome system). The purpose of increasing the damping effect is to decrease the vibration amplitude at the resonance frequency [8]. Raising the linear damping will help at resonant frequencies, but has no impact at all or even a negative effect at high frequencies [9].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Anti-Vibration Compliant Mechanism with Inertia Amplification

Xiao

Liu

et al. 2022

Preprint

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This paper presents a novel nonlinear anti-vibration compliant mechanism with inertia amplification (NAVCM-IA) for low frequency vibration isolation. This compliant mechanism consists of three-dimensional helical rods with stiffness nonlinearities, and an attached horizontally-installed inertia disc which performs as an inertia amplification. With this unique design, beneficial nonlinear stiffness can be achieved, which reduce the dynamic stiffness at equilibrium position and improve the vibration isolation performance at low frequency range. Moreover, the inertia amplification driven by the compliant mechanism achieves an apparent high dynamic mass and, accordingly, a low resonance frequency. The nonlinear compliant mechanism with inertia amplification is validated by experimental prototypes for their special nonlinear features. The proposed NAVCM-IA is a unique passive and adjustable low frequency anti-vibration solution in extensive engineering applications.

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“…There are many potential causes of disturbance on the spacecraft, among which the flywheel [2,3] and the control moment gyros [4,5] with middle and high frequency disturbance frequencies are considered to be the largest sources. Scholars have conducted a lot of relevant research and had many achievements with regard to the flywheel and control moment gyros [6][7][8]. On the other hand, the sun-tracking solar array is also a source of disturbance, and the disturbance it causes is mainly concentrated on the low-frequency band, which has the characteristics of a wide-frequency band and lasts for a long period of time [9].…”

Section: Introductionmentioning

confidence: 99%

Simulation and Experimental Research on the Disturbance Behavior of a Sun-Tracking Solar Array Driven by a Stepping Motor

Guan

Zhang

et al. 2021

Applied Sciences

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A sun-tracking solar array is an effective solution to the increasing energy demand of spacecrafts. However, the driving torque fluctuation of the solar array driving assembly (SADA) and its oscillatory motion lead to the micro-vibration problem of the spacecraft. In this article, a disturbance torque model of the sun-tracking solar array, which takes its friction and flexibility into consideration, is established. Furthermore, a test platform was built to measure the disturbance force/torque, and a solar array simulator (SAS) was designed to replace the solar array in the ground experiments. Finally, the disturbance torque of the SADA-driven SAS is simulated, and the model is validated by comparing the simulation results with the experimental results. These results show that the frequency error of the model is less than 0.648%, and the amplitude error of the corresponding frequency is less than 22.33%, which indicates that the proposed model can effectively predict the disturbance torque generated by the sun-tracking solar array in orbit. The research provides theoretical guidance for the system optimization design and micro-vibration suppression of spacecrafts.

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Modeling and validation of reaction wheel micro-vibrations considering imbalances and bearing disturbances

Cited by 20 publications

References 25 publications

Effect of Reaction Wheel Imbalances on Attitude and Stabilization Accuracy

Effect of Reaction Wheel Imbalances on Attitude and Stabilization Accuracy

Nonlinear Anti-Vibration Compliant Mechanism with Inertia Amplification

Simulation and Experimental Research on the Disturbance Behavior of a Sun-Tracking Solar Array Driven by a Stepping Motor

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