【航宇大講堂】Ultrasonic, vibrating, and oscillating structures for ground exploration


報告題目:Ultrasonic, vibrating, and oscillating structures for ground exploration 

報告人:Prof. Patrick Harkness(英國格拉斯哥大學教授)

報告時間:2021年11月19日 20:00—21:00(GMT+8)

報告地點:騰訊會議 687670724 



  The exploration of remote areas (such as the polar regions of the earth, or the surfaces of other planets) require relatively small systems that must penetrate the terrain with small amounts of power and at low levels of force. Different terrains present different problems. Granular materials such as sand behave in surprising ways, and ultrasonic vibration can be used to disrupt the mechanisms by which they resist penetration forces. Ultrasonic vibration can also be superimposed on drill tools, applied to rock, with a positive outcome, but when this technique is applied to ice it may cause melting and then cavitation, which can damage the tool. And, at depth, it becomes more difficult to sustain ultrasonic vibration over a long waveguide, and so the hammer mechanism may be separated from the drill, using either the ultrasonic percussion or hammer percussion mechanism. These first items are only the problems of cutting the terrain. The cuttings, both debris and samples, must be lifted out of the hole if progress is to continue. Ultrasonic techniques are being investigated for this application also, to see if the power and force requirements associated with augering – which is perhaps more difficult than cutting – can be reduced as well. Finally, there are the problems of learning how to explore in space, which is very expensive and does not tolerate mistakes. We will discuss how exploration in analogue environments (such as Antarctica) can be used to gain know-how, and produce scientific results which justify the training expeditions in their own right (especially in the context of environmental research).


  Patrick Harkness是英倫格拉斯哥高中專業專業醫學設計與工業超聲心動圖平臺講師,2004年收獲貝爾法斯特公主高中專業專業國際航空工程建筑設計生碩士學區房,200七年收獲克蘭菲爾德高中專業專業設計生學區房。Harkness講師對小行星外表面樣表提取很感興致,專注于于構建都具有自拆裝鉆柱的服務器人生產設備,控制提取和器皿化礦石樣表,并在火光模擬機班次展示出了專業化鉆探設備的性能。在歐州航天部局和歐州科學實驗課設計理事會會捐資助學下,Harkness講師做了空間區域和南極科學實驗課鉆探設備好項目,之后多少年將在英倫、格陵蘭島和南極洲對其進行公測的活動。