Harmonic reducers are widely used in various mechanisms of spacecraft, such as mechanism deployment, motion actuation, and precision pointing, due to their advantages of high single-stage reduction ratio, high transmission efficiency, small size, and large load capacity. For the application of spatial harmonic reducers in Solar Array Drive Assembly (SADA), in this paper, based on the envelope theory, a refined modeling of the commonly used double circular arc tooth profile harmonic reducer in space is completed. Static and transient dynamic finite element analysis of the complex harmonic model is carried out using ANSYS Workbench to study the motion and force distribution of the harmonic reducer under low-speed light-load conditions. The results are compared with those of the commonly used simplified tooth profile models to investigate the influence of tooth profile modeling on the calculation results, and a method to improve the convergence of the complex model is proposed. Based on the static and transient dynamic analysis results, fatigue analysis is conducted using nCode DesignLife, and the failure modes of the space harmonic reducer are identified, and conducted a lifetime prediction.
The single-mode fiber coupling efficiency with graded-index rod lenses can achieve higher coupling efficiency, compared with the direct alignment coupling of the single-mode fiber. The assembly error of direct alignment has a far greater impact on the coupling efficiency of the fiber than the GRIN lenses coupling to fiber. The analysis of the influence of the coupling error on the optical fiber coupling efficiency provides important theoretical support and guidance for processing and assembly. Axial error, radial error and angular tilt will all have different effects on fiber coupling efficiency. However, the fiber coupling system is not only limited to the coupling of the fiber and GRIN lenses, but also can be coupled with one or more lenses to analyze the advantages and disadvantages of multiple coupling methods.
Solar Array Drive Assembly(SADA) is a core component of high-power and long-life satellites, and the shafting is an important part of SADA. Its vibration characteristics analysis is very important in structural design and dynamic analysis. The paper theoretically derived and calculated the natural frequency of the shaft system under the action of bearing preload and span, and established a corresponding finite element simulation model in ANSYS. It is concluded that the natural frequency of the shafting increases with the increase of the bearing preload and the span, and the influence of the bearing span is more significant.
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