学术信息

【航宇大讲堂】Ultrasonic, vibrating, and oscillating structures for ground exploration

宣布时间:2021-11-18浏览次数:274宣布者:颜士轩来源:凯发k8国际登录

陈诉题目:Ultrasonic, vibrating, and oscillating structures for ground exploration 

陈诉人:Prof. Patrick Harkness(英国格拉斯哥大学教授)

陈诉时间:2021年11月19日 20:00—21:00(GMT+8)

陈诉所在:腾讯集会 687670724 

主办单元:航空学院、机械结构力学及控制国家重点实验室、精密驱动与控制研究所、航空航天交叉研究院智能航行器研究中心

陈诉内容摘要

  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).

陈诉人简介

  Patrick Harkness是英国格拉斯哥大学医学与工业超声中心教授,2003年获得贝尔法斯特女王大学航空工程硕士学位,2007年获得克兰菲尔德大学博士学位。Harkness教授对行星外貌样本收罗很感兴趣,致力于创建具有自组装钻柱的机械人设备,实现收罗和容器化岩石样本,并在火星模拟站点展示了自主钻井性能。在欧洲航天局和欧洲科学研究委员会资助下,Harkness教授开展了空间和极地科学钻探项目,未来几年将在英国、格陵兰岛和南极洲进行测试运动。