| The collection of lunar soil water ice is an important part of the exploration task of resource distribution in the lunar polar region.At present,there are two main sampling methods: drilling and penetration.The drilling method consumes a lot of power and requires a large reaction force.As a result,the drilling sampling method cannot be applied when solar power is not available at the north and south poles of the moon.The penetration sampling method is prone to jam in the process of excavation.Based on the traditional penetration sampling method,a double body vibration penetration sampling method is proposed in this paper.The double body vibration penetration sampling method has the characteristics of small reaction force and direct transmission.Taking the double body vibration penetration sampling method as the mainline,the structural optimization design,tunneling characteristics,and experimental verification of the lunar soil surface water ice sampler were completed.At first,the detailed characteristics of lunar soil water ice were learned through searching the relevant literature on the lunar soil water ice.A variety of sampler schemes were compared,and a kind of sampler suitable for working in the polar ultra-low temperature environment of the north and south poles of the moon is proposed.The sampler has the characteristics of simple structure,light weight,low reaction force,no wear,no lubrication,and low energy consumption,which well adapts to the environment of the north and south poles in the lunar.The sampler adopts the way of penetration sampling.According to different working principles,the different sampler driving schemes were designed.Then the optimal scheme was selected,and the detailed structural design was carried out.In addition,the maximum theoretical driving force of the determined scheme was optimized and analyzed by electromagnetic simulation.Next,the relationship between the resistance received during the working process of the sampler and the sampling depth was obtained by establishing the interaction model of the lunar soil of the implement.Based on this,the sampler tool was designed according to the one-way transport characteristics of the lunar soil water ice.The surface of the machine has a threaded structure,which can effectively discharge the lunar soil water ice.The effect of driving and chip removal of machines and tools was simulated by particle discrete element software.At last,the experimental platform was built after completing the analysis of the overall structure.The refractory brick was selected as the experimental sample brick,the hardness of the sample brick was obtained by uniaxial compression test,and the actual driving force and sampler amplitude were measured by experiment.Then the experiment was carried out to explore the sampling effect and the tunneling characteristics of the sampler under different parameters of current and frequency.The mass of particles stored in the cavity was measured by an electronic scale.According to experiment results,the relationship between the sampling depth and the amplitude and frequency of the current was obtained. |
