| The impact penetrator is a submersible planetary detector that detects the subsurface of the planet.It is carried by the satellite to the orbit of the planet and then released on the surface of the planet.Penetrator relies on its own inertia to penetrate to a certain depth of the planet,and its own scientific sensors can directly detect the magnetic field,temperature field and so on.The collected data is transmitted to the Earth via satellite.In order to achieve the desired scientific research purpose,it must be ensured that the payload carried can still work normally after the impact.Due to the harsh impact environment,the acceleration response of the penetrator is over 10,000 g,and the single-layer protection structure is difficult to meet the requirements.Therefore,it is necessary to carry out multi-layer protection design for the scientific load.In this paper,the protection structure of the penetrator is researched and tested by small impact test.The collision process under real working conditions is numerically simulated.Finally,the optimization function of the protection structure is constructed.The details are as follows:(1)A multi-layer damping protection structure is designed.The structure comprises rubber,polyurethane,spring and aluminum foam,thin wall and other vibration damping materials.The foam aluminum filled thin wall structure is the main vibration damping material.(2)The penetrating process of the penetrator has been modeled,and the effects of landing speed,angle of incidence and angle of attack on the penetration depth were studied in turn.Through numerical analysis,the limit angle of the penetrator landing is finally determined,which provides a reference for the protection design.(3)The impact response spectrum test was carried out on thin-walled and foamed aluminum-filled thin-walled structures.In the test,two acceleration sensors were installed to detect the acceleration response of the external and internal scientific loads of the penetrator.The impact test process was numerically simulated to verify the accuracy of the test.(4)Taking the cross-sectional shape as the research target,the ideal cross-sectional shape of the foamed aluminum-filled thin wall is obtained.Then the numerical simulation of the hexagonal cross-section filling structure under the collision is completed,and 25 sets of samples are collected.The response surface function is established based on the sample space,and the optimal solution is obtained by calculation and analysis. |
