According to the requirements of ground test task of lunar sampling manipulator, a microgravity simulation system based on suspension method is designed and developed. The system is mainly composed of Position tracking system, Force compensation system, Suspension system, Posture measurement system and Integrated control system. The simulation system has completed the ground test and ground verification of lunar sampling manipulator, which has been successfully launched, and successfully completed the on-orbit mission. The microgravity simulation system of manipulator has good universality and expansibility, and can be applied to the ground test of other space manipulator products.
The ball screw is a commonly used transmission component. When applied to the spacecraft mechanism, it is necessary to comprehensively consider space environmental factors such as on-orbit high and low temperature, vacuum, atomic oxygen, electron irradiation, single particle, ultraviolet and infrared irradiation. In view of the long-life application requirements of ball screws for spacecraft mechanism, the factors affecting the life of the ball screws are analyzed. Two design schemes are proposed according to the lubrication method of the ball screws and the material of ball for a ball screws of a certain spacecraft mechanism. The design scheme of ceramic ball + raceway sputtering MoS2 lubrication has been confirmed by the test. The design can work for no less than 7000 times under the specified load, which meets the requirements of the flight model on-orbit. Through the ball screw long-life test, it can be seen that the load capacity and service life of the solid lubricated ball screw are significantly reduced. In the development process of the spacecraft mechanism ball screw, a special life test must be carried out to verify whether the ball screw can meet the on-orbit requirements.
KEYWORDS: Reliability, Electromechanical design, Space operations, Control systems, Safety, Environmental sensing, Temperature metrology, Wave plates, Space robots, Relays
The TianHe manipulator is responsible for major tasks such as China Space Station construction, operation, and supporting astronaut’s extravehicular operations. The joint is the direct execution part of the manipulator to realize flexible movement, and it is the key component to ensure the core functions and performance of the China Space Station manipulator, The composition of the joint is complex, and the experience of its reliability design is very poor. So the research of reliability design method for the joint is of great significance. Starting from the joint reliability design method, this paper uses various methods such as redundant design, margin design, and environmental adaptability design to complete the joint reliability design comprehensively. The ideas and methods for reliability design for the joint of the China Space Station manipulator introduced in this paper have important reference value for the reliability design for the space complicated electromechanical products.
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