Research on Microvibration Transmission of Control Moment Gyro Considering Internal Structural Flexibility
Control moment gyro (CMG) can produce microvibration and influence the performance of sensitive instruments aboard the spacecraft. This article is aimed at constructing the microvibration transmission model of a large-scale CMG incorporating the flexibility of its internal structural components and...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2025-01-01
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| Series: | International Journal of Aerospace Engineering |
| Online Access: | http://dx.doi.org/10.1155/ijae/8885019 |
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| Summary: | Control moment gyro (CMG) can produce microvibration and influence the performance of sensitive instruments aboard the spacecraft. This article is aimed at constructing the microvibration transmission model of a large-scale CMG incorporating the flexibility of its internal structural components and at analyzing the transmission characteristics of microvibration disturbance. The system equation of a single-gimbal CMG is established by assembling motion equation of each component with matrix formulation, where the structural components are modeled as flexible bodies, and the model assuming all structural components as rigid bodies is also derived for comparison. Disturbance transfer function (DTF) is proposed as the tool to characterize the CMG disturbance transmission. The model proposed is validated by the good correlation between the test and simulation results of the modal features and disturbance output of a 1500-Nms CMG. Assuming all components as rigid bodies is verified to induce an unacceptable error, and the internal structural flexibility can significantly affect the CMG dynamic features. With DTFs, the transmission paths of various disturbance inputs are identified, and the mechanism of some gimbal angle–dependent features of the CMG is revealed. The static imbalance of the flywheel is demonstrated to be the decisive factor inducing output at the fundamental harmonic for the CMG tested, and estimation of the disturbance input at the 2Ω harmonic is achieved. The model established and the mechanism clarified of the disturbance transmission offer an important basis for the optimal design of CMG in minimizing its microvibration. |
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| ISSN: | 1687-5974 |