| At present,China’s lunar exploration project has been deployed to phase four.The successful launch of Chang’e-5 in 2020 and the successful collection of lunar soil have marked the successful completion of phase three of the lunar exploration project.In the fourth phase of China’s future lunar exploration project,Chang’e-7 will land on the moon and conduct sampling of polar lunar soil near the lunar poles.The purpose of this thesis is to design a lunar soil sampler for sampling lunar soil in polar regions.This thesis reviewed a large number of relevant literature both domestically and internationally,analyzed and summarized the sampling techniques of extraterrestrial soil both domestically and internationally.It designed a new type of dual body vibrating through sampler,which combined the extreme environment of the lunar polar region,the occurrence state of polar lunar soil,and physical and mechanical properties.The sampling workflow,development requirements,and driving form were proposed.Based on the unidirectional transport characteristics of lunar soil particles,the feasibility of sampling work was determined by analyzing the dual body vibration penetration theory and the sampling and delivery process.Design three different driving schemes and select the optimal driving scheme through analysis and comparison.According to the optimal driving scheme,the overall design of the sampler was carried out.Through finite element electromagnetic simulation,the size of the driving unit was optimized to determine the optimal size and driving force.Design and analyze the support plate spring.By comparing the axial and radial stiffness and stress distribution of different configurations of plate springs,determined the optimal configuration of the vortex plate spring.Analyze the influence of the rib width and spring thickness of the vortex plate spring on the axial and radial stiffness,and determined the optimal spring size.Based on the unidirectional transport characteristics of lunar soil particles and considering the effects of debris removal and penetration,the configuration of the equipment was designed,and mechanical simulation analysis was conducted on the equipment.Studying the sampling mechanism of the sampler,establishing a dynamic model of the sampler,and obtaining the influence of the sampler’s working frequency on the working amplitude.And establishing a mechanical model for the interaction between the machinery and the lunar soil,and analysing the specific factors that affect the resistance of the machinery cone.Simulating and analysing the penetration process of the implement,and obtaining the resistance characteristics of the implement cone during the penetration process,as well as the disturbance of the lunar soil under different gravity fields.And conduct simulation analysis on whether the sampler can impact and break the lunar soil water ice.Finally,the principle prototype of the sampler was processed,and the performance parameters of the sampler were verified through experiments.Simulation sampling experiments and storage effect experiments were conducted on polar lunar soil with different storage states to analyze the impact of different excitation parameters on sampling efficiency and determine the optimal excitation parameters. |
