Äîêóìåíò âçÿò èç êýøà ïîèñêîâîé ìàøèíû. Àäðåñ îðèãèíàëüíîãî äîêóìåíòà : http://www.iki.rssi.ru/conf/2009elw/presentations/presentations_pdf/session7/wiess_young_ELW.pdf Äàòà èçìåíåíèÿ: Mon Mar 2 19:59:43 2009 Äàòà èíäåêñèðîâàíèÿ: Sun Apr 5 19:10:50 2009 Êîäèðîâêà: Ïîèñêîâûå ñëîâà: ó ò ò ó ó òåò òåó ó ó ò ò ò ò ò òåò ò ò òåò

A thermal drill head for the exploration of subsurface ice layers on Europa
P. Weiss, K.L. Yung, N. KÆmle, S.M. Ko, G. Kargl, E. Kaufmann

A thermal drill head for the exploration of subsurface ice layers on Europa
P. Weiss (1), K.L. Yung (1), N. KÆmle (2), S.M. Ko (1), G. Kargl (2), E. Kaufmann (2)
(1) Hong Kong Polytechnic University

(2) Institut fuer Weltraumforschung (IWF), Austrian Academy of Sciences


A thermal drill head for the exploration of subsurface ice layers on Europa
P. Weiss, K.L. Yung, N. KÆmle, S.M. Ko, G. Kargl, E. Kaufmann

· The Objective of the Study
The objective of the study The objective of the study layers that is technically layers that is technically consumption. consumption. The development The development penetrate into ice penetrate into ice rock or regolith. rock or regolith. led to led to layers layers is to develop is to develop feasible in feasible in a sampling concept for subsurface ice a sampling concept for subsurface ice terms of payload mass and energy terms of payload mass and energy

a hybrid thermo-mechanical drill which is able to a hybrid thermo-mechanical drill which is able to even through layers of contaminants such as dust, even through layers of contaminants such as dust,


A thermal drill head for the exploration of subsurface ice layers on Europa
P. Weiss, K.L. Yung, N. KÆmle, S.M. Ko, G. Kargl, E. Kaufmann

·Concept
Main specifications: Main specifications: --Theoretical penetration depth approx. 10m. Theoretical penetration depth approx. 10m. -- This is This is [Greenberg [Greenberg beyond the radiation zone beyond the radiation zone 2005] 2005] gardening gardening layers of layers of

-- But still in the zone of meteoritic But still in the zone of meteoritic [Cooper et al., 2001], therefore [Cooper et al., 2001], therefore contaminant could be present! contaminant could be present!

Depths beyond one meter cannot be reached by classical Depths beyond one meter cannot be reached by classical Europan mission. Europan mission. But it might be necessary to investigate such depths to find But it might be necessary to investigate such depths to find of biological activity. of biological activity.

drilling systems in an drilling systems in an undamaged remands undamaged remands


A thermal drill head for the exploration of subsurface ice layers on Europa
P. Weiss, K.L. Yung, N. KÆmle, S.M. Ko, G. Kargl, E. Kaufmann

·Concept
The concept The concept principle: The principle: The Management Management probe. probe. is a mole-like is a mole-like cable is paid out cable is paid out System on the System on the locomotion locomotion by a Tether by a Tether rear of the rear of the

The channel behind the probe will most The channel behind the probe will most probably refreeze, thus block the cable. probably refreeze, thus block the cable.


A thermal drill head for the exploration of subsurface ice layers on Europa
P. Weiss, K.L. Yung, N. KÆmle, S.M. Ko, G. Kargl, E. Kaufmann

· A hybrid approach
A hybrid approach is proposed here as possible payload onboard a A hybrid approach is proposed here as possible payload onboard a Such system inhibits the advantages of both locomotion types, Such system inhibits the advantages of both locomotion types, reached by classical drills (>1m), but it can also overcome layers reached by classical drills (>1m), but it can also overcome layers rocks. rocks. llander (or even impactor). ander (or even impactor). it can reach depths that cannot be it can reach depths that cannot be of contaminants such as regolith and of contaminants such as regolith and


A thermal drill head for the exploration of subsurface ice layers on Europa
P. Weiss, K.L. Yung, N. KÆmle, S.M. Ko, G. Kargl, E. Kaufmann

· The Prototype

Tether Management System Tether Management System (not in this prototype) (not in this prototype) Rectangular heated body Rectangular heated body Counter-rotating blades Counter-rotating blades


A thermal drill head for the exploration of subsurface ice layers on Europa
P. Weiss, K.L. Yung, N. KÆmle, S.M. Ko, G. Kargl, E. Kaufmann

· Power consumption

Cabling Cabling thermal thermal

and power consumption of the and power consumption of the drill. drill.


A thermal drill head for the exploration of subsurface ice layers on Europa
P. Weiss, K.L. Yung, N. KÆmle, S.M. Ko, G. Kargl, E. Kaufmann

· The drilling system
The drilling mechanism not only The drilling mechanism not only enables the probe to overcome enables the probe to overcome contaminants. It also assures a contaminants. It also assures a good contact to the ice in case of good contact to the ice in case of sublimation. sublimation.


A thermal drill head for the exploration of subsurface ice layers on Europa
P. Weiss, K.L. Yung, N. KÆmle, S.M. Ko, G. Kargl, E. Kaufmann

· The heating system
1 Frontal Heating cartridge in 1 Frontal Heating cartridge in the "hot nose" the "hot nose"

The integration of the heating system is a The integration of the heating system is a critical issue to assure the thermal critical issue to assure the thermal conductivity between the different parts conductivity between the different parts (i.e. blades). (i.e. blades).

4 Lateral Heating cartridges 4 Lateral Heating cartridges


A thermal drill head for the exploration of subsurface ice layers on Europa
P. Weiss, K.L. Yung, N. KÆmle, S.M. Ko, G. Kargl, E. Kaufmann

· Performance Tests in Hong Kong
Performance tests were done (under normal atmosphere) to evaluate the penetration process. Performance tests were done (under normal atmosphere) to evaluate the penetration process.

In pure ice... In pure ice...

through fine sand... through fine sand... and rough sand. and rough sand.


A thermal drill head for the exploration of subsurface ice layers on Europa
P. Weiss, K.L. Yung, N. KÆmle, S.M. Ko, G. Kargl, E. Kaufmann

This delivered some preliminary data forr normal atmosphere. This delivered some preliminary data fo normal atmosphere.


A thermal drill head for the exploration of subsurface ice layers on Europa
P. Weiss, K.L. Yung, N. KÆmle, S.M. Ko, G. Kargl, E. Kaufmann

· Future Tests
Further tests are planned to qualify the system in space environment: Further tests are planned to qualify the system in space environment:

In vacuum to check the In vacuum to check the capabilities in a capabilities in a atmosphere. atmosphere.

penetration penetration sublimation sublimation

Through lunar regolith simulant JSC-1A Through lunar regolith simulant JSC-1A (USA) and CAS-1 (China, picture) (USA) and CAS-1 (China, picture)


A thermal drill head for the exploration of subsurface ice layers on Europa
P. Weiss, K.L. Yung, N. KÆmle, S.M. Ko, G. Kargl, E. Kaufmann

· Future Studies: Possible Payload
Such system Such system be integrated be integrated is obviously only valid, if sciientific payloads (in-situ measurements) can is obviously only valid, if sc entific payloads (in-situ measurements) can into the probe. into the probe. study was study was system into system into done done such such on the integration of a micro-pump for water on the integration of a micro-pump for water probe. probe. Some preliminary Some preliminary analysis and video analysis and video


A thermal drill head for the exploration of subsurface ice layers on Europa
P. Weiss, K.L. Yung, N. KÆmle, S.M. Ko, G. Kargl, E. Kaufmann

· Future Studies: Possible Payloads
We are searching for We are searching for partners that are interested partners that are interested in studying the integration in studying the integration of scientific payloads into of scientific payloads into such system. such system. A sampling system could A sampling system could collect particles that are freed collect particles that are freed from the ice and sink or fall from the ice and sink or fall down in the holes dip. down in the holes dip. Released gases are trapped Released gases are trapped in the liquid pocket around in the liquid pocket around the probe and can be the probe and can be collected for analysis. collected for analysis.


A thermal drill head for the exploration of subsurface ice layers on Europa
P. Weiss, K.L. Yung, N. KÆmle, S.M. Ko, G. Kargl, E. Kaufmann

· Conclusions
The here presented system The here presented system investigation of ice layers up to investigation of ice layers up to The advantage of such The advantage of such inclusions of contaminants inclusions of contaminants expected on Europa. expected on Europa. While the power While the power heating systems heating systems is is 10 10 a potential candidate for subsurface a potential candidate for subsurface meters. meters. hybrid mechanism is that it can overcome hybrid mechanism is that it can overcome (not blocked by regolith or rock) which can be (not blocked by regolith or rock) which can be

consumption of the overall system is still high, alternative consumption of the overall system is still high, alternative can be studied. can be studied.

The concept of a thermal-drill can be considered for a landing mission. The concept of a thermal-drill can be considered for a landing mission. But due to its simplicity compared to other drilling mechanisms it could But due to its simplicity compared to other drilling mechanisms it could also be imagined as payload onboard impacting probes. also be imagined as payload onboard impacting probes. The Hong Kong Polytechnic University will pursue this development The Hong Kong Polytechnic University will pursue this development study of potential payloads; and we search to cooperate with study of potential payloads; and we search to cooperate with institutions on this subject! institutions on this subject! with a with a other other


A thermal drill head for the exploration of subsurface ice layers on Europa
P. Weiss, K.L. Yung, N. KÆmle, S.M. Ko, G. Kargl, E. Kaufmann

We are looking forward to cooperate with you !