Single piezo-actuator rotary-hammering (SPaRH) drill

Sherrit, Stewart; Domm, Lukas; Bao, Xiaoqi; Bar‐Cohen, Yoseph; Chang, Zenghu; Bădescu, Mircea

doi:10.1117/12.915379

Cited by 21 publications

(6 citation statements)

References 11 publications

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“…To minimize the complexity of using multiple actuators in rotary-hammering drills, a solid-state rotary-hammer drill driven by a single piezoelectric stack actuator was developed and demonstrated [Sherrit et al, 2009]. The actuator consists of a horn that has a helical slots configuration that apply rotation forces that turn the bit (acting like a rotor) onto which it is pressed but it is also subjected to longitudinal vibrations (Figure 8).…”

Section: Rotary-hammering Sampler Actuated By a Single Piezoelectric mentioning

confidence: 99%

Drilling, Coring, and Sampling Using Piezoelectric Actuated Mechanisms : From the USDC to a Piezo-Rotary-Hammer Drill

Bar‐Cohen

Sherrit²,

Bădescu³

et al. 2012

Earth and Space 2012

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NASA exploration missions are increasingly including sampling tasks but with the growth in engineering experience (particularly, Phoenix Scout and MSL) it is now very much recognized that planetary drilling poses many challenges. The difficulties grow significantly with the hardness of sampled material, the depth of drilling and the harshness of the environmental conditions. To address the requirements for samplers that could be operated at the conditions of the various bodies in the solar system, a number of piezoelectric actuated drills and corers were developed by the Advanced Technologies Group of JPL. The basic configuration that was conceived in 1998 is known as the Ultrasonic/Sonic Driller/Corer (USDC), and it operates as a percussive mechanism. This drill requires as low preload as 10N (important for operation at low gravity) allowing to operate with as low-mass device as 400g, use an average power as low as 2-3W and drill rocks as hard as basalt. A key feature of this drilling mechanism is the use of a free-mass to convert the ultrasonic vibrations generated by piezoelectric stack to sonic impacts on the bit. Using the versatile capabilities of the USDC led to the development of many configurations and device sizes. Significant improvement of the penetration rate was achieved by augmenting the hammering action by rotation and use of a fluted bit to remove cuttings. To reach meters deep in ice a wireline drill was developed called the Ultrasonic/Sonic Gopher and it was demonstrated in 2005 to penetrate about 2-m deep at Antarctica. Jointly with Honeybee Robotics, this mechanism is currently being modified to incorporate rotation and inchworm operation forming Auto-Gopher to reach meters deep in rocks. To take advantage of the ability of piezoelectric actuators to operate over a wide temperatures range, piezoelectric actuated drills were developed and demonstrated to operate at as cold as-200 o C and as hot as 500 o C. In this paper, the developed mechanisms will be reviewed and discussed including the configurations, capabilities, and challenges.

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Section: Rotary-hammering Sampler Actuated By a Single Piezoelectric mentioning

confidence: 99%

Drilling, Coring, and Sampling Using Piezoelectric Actuated Mechanisms : From the USDC to a Piezo-Rotary-Hammer Drill

Bar‐Cohen

Sherrit²,

Bădescu³

et al. 2012

Earth and Space 2012

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“…In other recent papers [5], [6] we developed a single actuator rotary hammer drill where we designed ultrasonic horns to produce both a rotation and hammering in the base of the drill bit. The prototype actuator is shown in Figure 1 along with the FEM model.…”

Section: Introductionmentioning

confidence: 99%

“…A sinusoidal voltage is applied across the transmitting piezoelectric at a known frequency generating acoustic waves that travel through the armor into the receive piezoelectric where the stress wave generated a sinusoidal voltage. This approach has been used to transmit up to 1 kW power with up to 87% efficiency [2], [3], [4], [5].…”

Section: Introductionmentioning

confidence: 99%

Acoustic mechanical feedthroughs

et al. 2013

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Electromagnetic motors can have problems when operating in extreme environments. In addition, if one needs to do mechanical work outside a structure, electrical feedthroughs are required to transport the electric power to drive the motor. In this paper, we present designs for driving rotary and linear motors by pumping stress waves across a structure or barrier. We accomplish this by designing a piezoelectric actuator on one side of the structure and a resonance structure that is matched to the piezoelectric resonance of the actuator on the other side. Typically, piezoelectric motors can be designed with high torques and lower speeds without the need for gears. One can also use other actuation materials such as electrostrictive, or magnetostrictive materials in a benign environment and transmit the power in acoustic form as a stress wave and actuate mechanisms that are external to the benign environment. This technology removes the need to perforate a structure and allows work to be done directly on the other side of a structure without the use of electrical feedthroughs, which can weaken the structure, pipe, or vessel. Acoustic energy is pumped as a stress wave at a set frequency or range of frequencies to produce rotary or linear motion in a structure. This method of transferring useful mechanical work across solid barriers by pumping acoustic energy through a resonant structure features the ability to transfer work (rotary or linear motion) across pressure or thermal barriers, or in a sterile environment, without generating contaminants. Reflectors in the wall of barriers can be designed to enhance the efficiency of the energy/power transmission. The method features the ability to produce a bi-directional driving mechanism using higher-mode resonances. There are a variety of applications where the presence of a motor is complicated by thermal or chemical environments that would be hostile to the motor components and reduce life and, in some instances, not be feasible. A variety of designs that have been designed, fabricated and tested will be presented.

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“…Progress in soft robotics, wearable assistive and rehabilitation devices, and compliant human machine interfaces for virtual reality depends on novel forms of soft actuators that can replace the bulky motors used in traditional robotic systems. [1] There are a variety of emerging actuator technologies, including piezoelectric actuators, [2][3][4][5][6] pneumatic artificial muscle, [7][8][9][10][11][12][13][14] dielectric elastomer actuators, [15][16][17] shape memory alloys, [18][19][20][21] and shape memory polymers. [22][23][24] Recently, liquid crystal elastomers (LCE) actuators have drawn attention [25][26][27][28][29][30][31][32][33] mainly due to two promising advantages: the simple synthesis of the polymer itself and the fact that it can be printed and patterned through digital means.…”

Section: Introductionmentioning

confidence: 99%

Toward Fully Printed Soft Actuators: UV‐Assisted Printing of Liquid Crystal Elastomers and Biphasic Liquid Metal Conductors

Veiga

Carneiro

Molter

et al. 2023

Adv Materials Technologies

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Development of soft and compliant actuators has attracted tremendous attention due to their use in soft robotics, wearables, haptics, and assistive devices. Despite decades of progress, the goal of entirely digitally‐printed actuators has yet to be fully demonstrated. Digital printing permits rapid customization of the actuator's geometry, size, and deformation profile, and is a step toward mass customization of user‐specific wearables and soft robotic systems. here, a set of materials and methods are demonstrated for rapid fabrication of 3D‐printed Liquid Crystal Elastomer actuators electrically stimulated via a printed joule heater composed of a Liquid Metal (LM)‐filled elastomer composite. Unlike other Ag‐based inks, this LM‐elastomer composite is sinter‐free, enabling room‐temperature printing, and is stretchable, allowing cyclic actuation without electrical or mechanical failure of the conductor. By optimizing printing parameters, and improving the photo‐polymerization setup, a printed actuator that bends to an angle of 320° is demonstrated, with lower power consumption than previous LCE actuators. We also demonstrate a customized UV‐polymerization setup that permits photo‐curing of the LCE actuator in ≈90s, i.e., >500x faster compared to previous works. The rapid photo‐polymerization enables progress toward 3D‐printing of multi‐layer actuators and is a step toward mass customization of fully digitally‐printed robotic and wearable devices.

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Single piezo-actuator rotary-hammering (SPaRH) drill

Cited by 21 publications

References 11 publications

Drilling, Coring, and Sampling Using Piezoelectric Actuated Mechanisms : From the USDC to a Piezo-Rotary-Hammer Drill

Drilling, Coring, and Sampling Using Piezoelectric Actuated Mechanisms : From the USDC to a Piezo-Rotary-Hammer Drill

Acoustic mechanical feedthroughs

Toward Fully Printed Soft Actuators: UV‐Assisted Printing of Liquid Crystal Elastomers and Biphasic Liquid Metal Conductors

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