Abstract
The large-sized space environmental simulation test facility is mainly used for providing thermal radiation environment in high-vacuum, cold and dark space for satellites, spacecraft, lunar spacecraft to carry out whole satellite thermal vacuum test and for large equipment like antenna to carry out tests in TV conditions. Monitoring the spacecraftโs surface optical image or temperature is a main task in space environment simulation test. In previous tests, optical image test mainly took place in a fixed position, so the measuring location and angle are limited. This paper focuses on large spherical space environmental simulation test facility, and designs a large arc-shape high-precision walking device in a space environment simulation test device. It introduces key technology in detail like structure design, thermal design, processes and manufacturing, etc. The test results show that this device can work steadily and reliably under simulation space environments, and the precision exceeds 0.5ยฐ.
Highlights
During the development of the spacecraft, in order to ensure correctness of spacecraft design and enhance reliability of on-orbit operation, itโs a must to simulate cold and dark environments on the ground with solar radiation after the spacecraft is on the orbit, and carry out enough verification tests under such environments
We need to design a walking device that can work in space environmental simulation facility, allow large-range movements of the measuring instrument and adjust the vision direction of the measuring instrument
The emphasis and difficulty in the research are put on the structure design, thermal design, process design and other key elements of the large movement equipment that can work reliably in TV conditions [1]
Summary
During the development of the spacecraft, in order to ensure correctness of spacecraft design and enhance reliability of on-orbit operation, itโs a must to simulate cold and dark environments on the ground with solar radiation after the spacecraft is on the orbit, and carry out enough verification tests under such environments. We need to design a walking device that can work in space environmental simulation facility, allow large-range movements of the measuring instrument and adjust the vision direction of the measuring instrument. The device consists of large arc-shape guide rail, track car, two-dimensional turntable, cable lead-out equipment and monitor system (including monitor software).The deviceโs main body works in a large spherical space environmental simulation test facility ( ฮฆ 18 m), and the structure is shown in Figure 1 below. The arc-shape guide rail permits the measuring instrument to rotate around the measuring aircraft, so as to do optical image measurements in different locations and at different angles. Itโs equipped with electric walking and posture adjustment to position rapidly and accurately Considering that this device works in TV conditions, the design option should meet requirements of low temperature (ฤฐ100K) and high vacuum (ฤฐ10-3Pa). The arc-shape track is equipped with cable drag chain, and it can drive required power cables and signal cables to move with measuring instruments
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