YANG Lin,WANG Yan-song,WEI Lei,et al.Identification method of micro-vibration parameters of satellite reaction wheelsunder continuous rotating speed[J].Optics and Precision Engineering,2021,29(03):592-604.
Owing to manufacturing and assembling errors, the harmonic interference generated by a reaction wheel assembly (RWA) is the primary factor leading to the micro-vibration of optical remote sensing satellites, which seriously hinders the development of high-resolution optical remote sensing satellites. To achieve more effective micro-vibration suppression in the design of optical remote sensing satellites, it is necessary to accurately grasp the relevant parameters of RWA micro-vibrations. This paper proposes a parametric identification method for RWA at continuous rotating speeds. The micro-vibration characteristics of the RWA are obtained in the time-frequency domain. First, a time-frequency analysis is used to obtain a time-frequency distribution of non-stationary disturbing force/moment signals. Then, a linear least squares (LLS) estimator with a sector window is established to identify the harmonic characteristics. Subsequently, a speed-dependent parameterized model is built to describe the RWA model; further, using a weighted nonlinear least-square (WNLS) estimator, the parameters of the parameterized model are estimated and transformed into modal parameters. By combining modal parameters and harmonic characteristics, the speed-frequency peaks of the disturbing forces/moments can be estimated. Experiments are performed to verify the proposed method. The results demonstrate that the proposed method presents practical trends of disturbing forces/moments. Compared with the results obtained under traditional fixed-speed states, the errors are less than 1%, confirming the accuracy of the proposed method.
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