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X.Li, A.Bolhovitins, R.Timoney, P.Harkness, M.Lucas University of Glasgow, UK

1 st Space Glasgow Research Conference , Glasgow, UK, 28 October, 2014. Modelling and Experimental Validation of a Novel Ultrasonic Planetary Core Drill (UPCD) Tool Design. X.Li, A.Bolhovitins, R.Timoney, P.Harkness, M.Lucas University of Glasgow, UK. Outline. Background UPCD Assembly

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X.Li, A.Bolhovitins, R.Timoney, P.Harkness, M.Lucas University of Glasgow, UK

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  1. 1st Space Glasgow Research Conference, Glasgow, UK, 28 October, 2014 Modelling and Experimental Validation of a Novel Ultrasonic Planetary Core Drill (UPCD) Tool Design X.Li, A.Bolhovitins, R.Timoney, P.Harkness, M.Lucas University of Glasgow, UK

  2. Outline • Background • UPCD Assembly • Numerical Model • Simulation Results • Conclusions

  3. Background NASA – Jet Propulsion Laboratory (JPL) SELEX GALILEO – ExoMars Mission Ultrasonic/Sonic Driller/Corer (USDC) operated from the Sojourner platform Conventional Driller/Corer

  4. Background Compared with conventional drilling/coring, USDC has the following advantages: • Light-weighted, compact, low pre-load, low power • Operate with a minimum axial load and holding torque which is suitable for low gravity environments • Operate at extreme temperatures • Avoid drill bit jamming, breaking, dulling etc • Capable of drilling a wide range of rocks UoG/MP Drill in Tenerife 2011

  5. UPCD Assembly

  6. UPCD Assembly

  7. UPCD Mechanism • Due to piezoelectric effect, piezoceramic rings convert high frequency voltage into ultrasonic vibration at the transducer base, and the level is adjustable depending on the power consumption. • A tapered horn is used to amplify the vibration and ensure a considerable level of vibration at the horn tip • The ultrasonic transducer assembly drives a free flying mass which bounces between the horn tip and the base of drill stems at sonic frequencies. • The chaotic motion of the free mass create stress which propagates through the drill stems to the rock surface, rock fractures once stress exceeds the compressive limit • Three drill stems will be used with each length 10cm. UPCD assembly target mass is 7kg, target power consumption 40W.

  8. Numerical Model UPCD assembly dynamic equations:

  9. Simulation Results

  10. Simulation Results

  11. Conclusions • A novel driller/corer device has been developed with the USDC mechanism however employs two compression springs for different purposes • Dynamics of the UPCD process has been modelled and analysed, compression spring rates are optimized which delivers the maximum effective impulse from the drill to the rock • Experiments with dual springs are currently being performed which allows to validate the simulation results • A 1/2 wavelength ultrasonic transducer has been designed to decrease the weight and length of the UPCD assembly

  12. Thank you !

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