A Motion Control System Design for an Ultrasonic Percussive Coring/Drilling Unit

Li, Xuan; Harkness, Patrick; Timoney, Ryan; Bolhovitins, Aleksandrs; Lucas, Margaret

doi:10.2514/6.2015-4554

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…At the tip of the drill-bit, an impact plate made of tool steel is attached to a force sensor (Kistler 9321B), which backs onto a heavy stanchion. The whole assembly can be driven by a DC voltage controlled linear actuator (LT225-1-300P) in order to vary the weight-on-bit and emulate the motion control system [20]. The linear actuator is demobilized in this study.…”

Section: Parametric Optimization Of the Dynamic Stackmentioning

confidence: 99%

A Parametric Study for the Design of an Optimized Ultrasonic Percussive Planetary Drill Tool

Harkness

Worrall

et al. 2017

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Abstract-Traditional rotary drilling for planetary rock sampling, in-situ analysis and sample return, is challenging because the axial force and holding torque requirements are not necessarily compatible with lightweight spacecraft architectures in low-gravity environments. This article seeks to optimize an ultrasonic-percussive drill tool to achieve rock penetration with lower reacted force requirements, with a strategic view towards building an Ultrasonic Planetary Core Drill (UPCD) device. The UPCD is a descendant of the Ultrasonic/Sonic Driller/Corer (USDC) technique. In these concepts, a transducer and horn (typically resonant at around 20kHz) is used to excite a toroidal free-mass which oscillates chaotically between the horn tip and drill base at lower frequencies (generally between 10Hz to 1kHz). This creates a series of stress pulses which are transferred through the drill-bit to the rock surface and, while the stress at the drill-bit tip/rock interface exceeds the compressive strength of the rock, cause fractures that result in fragmentation of the rock. This facilitates augering and downward progress. In order to ensure that the drill-bit tip delivers the greatest effective impulse (the time-integral of the drill-bit tip/rock pressure curve exceeding the strength of the rock), parameters such as the spring rates and the mass of the free-mass, drill-bit and transducer have been varied and compared in both computer simulation and in practical experiment. The most interesting findings, and those of particular relevance to deep drilling, indicate that increasing the mass of the drill-bit has a limited (or even positive) influence on the rate of effective impulse delivered.

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Section: Parametric Optimization Of the Dynamic Stackmentioning

confidence: 99%

A Parametric Study for the Design of an Optimized Ultrasonic Percussive Planetary Drill Tool

Harkness

Worrall

et al. 2017

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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“…In order to carry out both performance testing whilst providing a proving ground for key technologies critical to development, the UPCD project has constructed a mechanical rig. The rig, detailed in Figure 3, allows a testing variant of the ultrasonicpercussive drill to advance autonomously, utilizing an in-house control algorithm [Li, 2015], in to a rock formation. The control loop requires a pre-set Reference Power Level, derived from the power electronics of the ultrasonic transducer.…”

Section: Test Proceduresmentioning

confidence: 99%

Push-and-Twist Drillstring Assemblies

Timoney¹,

Li²,

Worrall³

et al. 2016

Earth and Space 2016

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Deep drilling using a rigid drillstring requires the assembly and disassembly of multiple drill pipes. The interfaces between these pipes provide a challenge for automation because they must transmit large drilling forces and movements while, at the same time, minimise the actions and forces that are needed to make or break the interface. A geometry which can address these requirements has been suggested by the authors. This approach would use a push-and-twist bayonet system to engage drill pipes, with torque transmission through the bayonet studs. A variety of L-shaped and T-shaped bayonet paths have been proposed to ensure that separation of specific drill pipes can be achieved through a combination of clockwise and counter-clockwise rotation and single-point clamping. Sustained drills into a variety of media are used to show that percussive impulses are transmitted across the interface, whilst ensuring that the drill interface is able to withstand the shock loading associated with hammer-drilling. These tests are repeated and contrasted to control experiments using a single-piece control drillstring, which allows the performance of the interface and any degradation over time to be quantified. Results suggest that the bayonet-style connection performs well with no significant performances losses encountered or structural degradation noted.

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Development of a generator for percussive ultrasonic drills used in asteroid exploration based on impedance characteristics analysis

et al. 2022

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A Motion Control System Design for an Ultrasonic Percussive Coring/Drilling Unit

Cited by 4 publications

References 8 publications

A Parametric Study for the Design of an Optimized Ultrasonic Percussive Planetary Drill Tool

A Parametric Study for the Design of an Optimized Ultrasonic Percussive Planetary Drill Tool

Push-and-Twist Drillstring Assemblies

Development of a generator for percussive ultrasonic drills used in asteroid exploration based on impedance characteristics analysis

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