The Design Of Ultrasonic/Sonic Driller/Corer

As the development of science and technology, human being has not only constrained the research on the earth, but also expended to the whole polar system and even the cosmos to investigate and analyze the relationship between spacial and natural phenomenon using a more universal sight. Meanwhile, the shortage of global resources and serious environment problem has pushed people to search the resources and living places outside. Thus, many countries have conducted many aerostatic activities ever since the 21st century.China has published two official documents in 2000 and 2006, respectively, which pronounced that the government will mainly focus on the moon investigation project to realize the landing and investigation using unmanned method. However, with the low gravity, large temperature difference between day and night, high radiation, and so on, the environmental condition on the surface of moon is much more worse than the earth. In addition, so far people are mainly using the polar energy to conduct the spacial job outside. Thus, the ordinary drilling method can not be used on the moon surface. As a result, after the extensive research and comparison work on the spacial drilling sampler in use or still under producing, this paper concentrates on the basic theories and prototype design for a Ultrasonic/Sonic Driller/Corer (USDC) which can be used for the rock core sampling outside of earth.Regard to the research method, on account of the similarity between the vibration equation for the unit mass system and LC vibration circuit system equation, the mechanical structure of the ultrasonic actuator is equivalent to a circuit network, in which electrical parameters are determined by the mechanical ones. Dimensions of the actuator are calculated by the series resonant equation of the circuit network.With the help of the general finite element computer program ANSYS, modal analysis between 0~30000Hz of USDC is conducted. After that, NV-2901 Laser Doppler Vibrometer is used to analyze the frequency response characteristic of USDC, which verified the accuracy of finite element method on modal analysis.On the experimental platform of USDC, drilling tests were conducted on clayey brick, muddy rock, etc., which confirmed that USDC given in this paper can be used for different rock sampling. The harder the rock, the longer time needed for the drilling. As the axial drilling pressure is given, the drilling efficiency will be dramatically enhanced.At the end, some conclusions are made on the experiments and the prototype design of USDC. Also, some suggestions are provided regard to the problems occurred on the design and laboratory experiment. All the work in the paper lay a solid foundation on the research and design of USDC.