| The main task of the third lunar exploration project is to drill and obtain soil samples from the surface of the moon which is not less than 2 meters and can keep the bedding plane information. The rotary drive components is to provide enough rotary power for coring drilling tools to ensure the drill carrying on the corresponding demand patterns according to different lunar soil samples. Its working state and reliability is critical. The lunar surface is vacuum environment and has alternate cold and hot temperature. The temperature field become one of the major factors that determine its performance. Theoretical and experimental research on the temperature characteristics of the rotary drive components is based on this background.In this paper, the temperature resistance network will be used as theoretical analysis to solve temperature field of the rotary drive components. First, the accurate calculations of the motor portion and the inner portion totaling five heat source will be acquired. Secondly, the heat resistance network model will be created according to the exchange relations about the internal components of the rotary drive system and outside world. The numerical thermal resistance, heat capacity heat and other physical parameters of value will be substituted into the thermal resistance network. Then transient heat balance equations about the heat transfer node of the system will be established following the first law of thermodynamics. Using rank 1 Quasi-Newton method numerical solution to give temperature rise curve about steady-state temperature field and transient temperature field of the rotation drive member in each mode by programming system of MATLAB. Last Vacuum-Temperature test about the rotary drive member will be conducted. In accordance with the purpose and requirements of the test, setting up Vacuum-Temperature test stand, developing appropriate test programs and test processes, simulating lunar real environment in the test chamber. To give the temperature rise test data about the rotation drive member under each working model.In this paper, an analysis of the theoretical and experimental study about temperature field of the rotary drive member is completed in accordance with the special vacuum environment of lunar surface. And a new thermal network model is built for further optimization according to the specific heat distribution and heat transfer paths. Two results of tested data and theoretical calculation are basically the same, proving the accuracy of the calculation model and theoretical analysis method. The end-use verification theoretical model predicts the thermal state of the rotation drive member sampling in the lunar surface and its safe working time under each working model. It gives the technical support for the smooth implementation of the third lunar exploration project. |
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