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 

主辦單位：航空學院、機械結構力學及控制國家重點實驗室、精密驅動與控制研究所、航空航天交叉研究院智能飛行器研究中心

報告內容摘要：

  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).

報告人簡介：

  Patrick Harkness是英國格拉斯哥大學醫(yī)學與工業(yè)超聲中心教授，2003年獲得貝爾法斯特女王大學航空工程碩士學位，2007年獲得克蘭菲爾德大學博士學位。Harkness教授對行星表面樣本采集很感興趣，致力于創(chuàng)建具有自組裝鉆柱的機器人設備，實現(xiàn)采集和容器化巖石樣本，并在火星模擬站點展示了自主鉆井性能。在歐洲航天局和歐洲科學研究委員會資助下，Harkness教授開展了空間和極地科學鉆探項目，未來幾年將在英國、格陵蘭島和南極洲進行測試活動。