Protection Design And Simulation Analysis Of Small Penetrator

As a kind of celestial exploration,high speed penetrator has great scientific significance and research value.It can be the key technical foundation for future research on the deep space exploration and space based weapon system.The penetration will hit the surface of the planet with a speed of about 300m/s,which is equivalent to a free fell from the 4.5km of the earth surface.The mission of the penetrator is not only to ensure the effective penetration of the depth of the detected medium,but also to ensure the payload and the detecting equipment survived.This will be a serious challenge for the structure design and vibration reduction design of the penetrator.Therefore,based on the above problems,in this paper we design a kind of a small penetrator,providing a high speed.This penetrator has the characteristics of light weight high rigidity and excellent shock absorption,which can effectively impact small celestial bodies,and scientific exploration of the composition and structure of the interior of the moon can be studied.On the basis of the above structure,the following work has been conpleted:1.Firstly,the physical properties of lunar soil were introduced.I study the failure mechanism of lunar re go lith and stress state in the process of penetrator diving。And then the vertical and oblique penetration is analyzed.Kinetic model of penetrator is established by using momentum theorem and kinetic energy theorem to determin impact force and displacement.2.Using Hyermesh software to mesh the 3D solid model of the penetrator,and the boundary conditions of the grid is given.Then the modal analysis of the finite element model is carried out by using the MSC.Nastran software,and the free mode vibration mode of the frequency in 4000Hz is obtained;The modal test is carried out with the LMS test system and the B&K sensors,and the comparison with the simulation analysis is carried out.3.In the following,the impact test analysis is carried out on the test article,and the acceleration response values of the main points are obtained through experiments.Then,the entire impact process is simulated using Hypermesh and Nastran software.The acceleration response of the corresponding points in the model are obtained.By comparing the experimental and simulation results,the two results are basically consistent,which can achieve a good validation results.The internal measuring point acceleration is in the range of allowable,and the effect of vibration reduction is achieved.4.Finally,Numerical simulation is carried out on the process of penetrator vertical penetration and oblique penetration of soil by using LS-DYNA software.The motion trajectories and acceleration curve,and the depth curve of the penetration are obtained.The characteristics of the overload curves are analyzed,and the movement rules and characteristics of the penetration and oblique penetration of the lunar soil are obtained through comparison,which provides a reference for the future optimization design of the penetrator.