Research On Aluminum Honeycomb Buffer Device For Lunar Soft Landing

In order to obtain abundant resources on the moon,humans launched a series of exploration activities on the moon.From the lunar exploration to the soft landing of the moon,more countries plan to land on the moon in the future.In order to protect the scientific load on the lander,the key technologies for landing buffering are essential.Aiming at the cellular buffer device in the landing process,this paper uses the discrete element method to establish the discontinuous flexible ground,spider network honeycomb buffer structure and its corresponding landing coupling model,and simulates the landing process to study the the cushioning characteristics of the honeycomb buffer device under different landing conditions.A multivariate prediction model was established to predict the landing results and provide reference for the design of the lander and its buffer device.According to the buffer energy absorption characteristics and the mechanical properties of lunar soil,a discrete meta-monthly soil model was established to analyze the influence of lunar soil friction coefficient and recovery coefficient on lunar soil accumulation angle,and the lunar soil parameters were calibrated.The cushioning energy absorption characteristics of the lunar soil model were verified by pressure test.Aiming at the mechanical properties and deformation mechanism of aluminum honeycomb materials,the different simulation schemes were compared and analyzed.Finally,the bonding model of honeycomb was established by discrete element method,and the parameters of honeycomb materials were matched by compression experiments.Comparing the simulation and experimental platform stress and deformation results under different compression directions,the feasibility of the discrete element cellular simulation scheme and its parameters was verified.In order to meet the buffer requirements of larger landers,a spider web honeycomb structure is proposed.The discrete element secondary development program is used to study the modeling method,and the model is subjected to global compression and local impact to verify the energy consumption characteristics of the spider honeycomb structure.On this basis,the lander coupling model is established to study the influence of different lander mass,landing initial velocity and lunar slope on the landing buffer characteristics,and establish corresponding predictions.The model is analyzed by SPSS,and the prediction model expressions of overload acceleration and honeycomb deformation are obtained,which provides a reference for the structural design of the later lander.