15 August 2011 The design and characteristics analysis of lunar based Two Axes gimbal with high reliability
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In order to meet the requirements of lunar based astronomical observation which includes three different observing modes: specific celestial body observations, calibration observations, sky surveys, the two Axes gimbal is designed to guarantee the telescope can point and listen to a exact point in the sky. Due to the harsh environment on the moon and space payload weight limit, based on lightweight design method, such as structure optimization and rational material selection, the weight of gimbal is greatly reduced without decrease of rigidity and strength. In addition, because of the usage of external rotor mechanism for vertical shaft, the system's first order mode along the emission direction is greatly improved. On the other hand, The shaft with one fixed end and another free end is adopted to reduce the deflection between its two larger span ends. Furthermore, the shaft stuck at both ends due to temperature changes on the moon is eliminated by rational determining the clearance of deep groove ball bearings. Experiments show that, the system's first order resonant frequency can reach 81HZ, and the mechanism works well from -25 °C to +60 °C without stuck phenomenon occured. So, because of the adoption of approaches mentioned above, the mechanism has good mechanical properties, such as high reliability and light weight.
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Jing Huang, Jing Huang, Zhao-hui Liu, Zhao-hui Liu, } "The design and characteristics analysis of lunar based Two Axes gimbal with high reliability", Proc. SPIE 8196, International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications, 81960L (15 August 2011); doi: 10.1117/12.899596; https://doi.org/10.1117/12.899596

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