Lunar Surface Sampling Study On Mechanical Characteristics Of Tool-soil Interaction

The third stage of China’s lunar exploration program regards unmanned sample-return asthe main task, in two ways, surface sampling and diamond samples to get the samples in Tableacquisition mode. Which surface sampling obtains shallow lunar surface regolith and rocksamples are by digging, shoveling and gripping. Surface sample is the most effective and easyway to achieve.It is also the key and basis to determine the success of three mission critical andinfrastructure. For this reason, research the relationship of institutions and sampler (samplingshovel) with the mechanical properties of lunar soil interactions to explore the state of lunar soil,and sampling conditions set structure of sample resistance and work efficiency of the law can beprovided the reference and basis for the sampler development, optimization and sampling.According to the table sampling shovel to dig and work principle of action, developinglunar surface table take effect soil sampling machine test stand, JLU-2simulation andexperimental study of lunar soil lava simulated lunar surface, for digging and scooping samplingconducted sampling are used. By scooping angle test analyzes buried, buried speed, state of lunarsoil simulant for scooping influence of resistance. Test Study buried by digging angle regolithstate distribution on digging stones working resistance. By analyzing the three-dimensionalscanning of the sample on the lunar soil disturbance and destruction. According to the theory,soil excavation and soil dynamics based on the model Gill was amended to establish a test caseand take appropriate shovel model; dig model uses Zelenin model for analysis dig torquevariation with angle Comparative analysis of the model and test results of the two models canbetter describe the change process shovel digging resistance and torque.Through discrete element software PFC2D/3D biaxial and triaxial simulations and actualshovel to dig a large deformation and failure characteristics of lunar regolith, analyzing therelationship between the microscopic parameters and macroscopic mechanical parameters oflunar soil to determine the microscopic parameters for the model analysis. By PFC2D/3D shovelto dig under microgravity conditions characteristics were analyzed. Large diameter particles generated by PFC2D way to simulate lunar rocks, the establishment of a fault condition andlocation of different sizes, were scooping process simulation of low gravity state. By PFC3Dshovel to dig for different software process were studied under low gravity. Analysis of thesituation bucket shovel into a certain depth and horizontal cutting shovel to dig up and analyzethe situation and then dug a bucket penetrate different depths, analyzed the width of the bucketdigging regolith influence of torque.Research contents and achievements can provide certain theory and data reference for theimplementation of sampling and sample preparation of organization and optimization design.