Novel horn designs for power ultrasonics

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

doi:10.1109/ultsym.2004.1418291

Cited by 37 publications

(14 citation statements)

References 5 publications

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“…Modified bismuth titanate is a promising material and is indeed now well commercialized [59,60] in proprietary formats, particularly as it offers HT properties and is lead free, but when incorporated into device design still requires significant consideration to its large TCE mismatch to metals, particularly for electrodes, limiting its ability to be simply swapped for PZT.…”

Section: Bismuth Titanate (Bit)mentioning

confidence: 99%

Piezoelectric materials for high temperature transducers and actuators

Stevenson

Martin

Cowin

et al. 2015

J Mater Sci: Mater Electron

114

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Piezoelectric sensors and actuators are a mature technology, commonplace amongst a plethora of industrial fields including automotive, maritime and non-destructive testing. However the environments that these devices are required to serve in are becoming more demanding, with temperatures being driven higher to increase efficiencies and reduce shut-downs. Materials to survive these temperatures have been the focus of many research groups over the last decade, but there still remains no standard for the measurement of piezoelectric materials at high temperature. This is required to effectively determine comparable Figures of Merit into which devices can be successfully designed. As part of a recent European effort to establish metrological techniques for high temperature evaluation of electro-mechanical properties, we present here a review of the most promising high temperature polycrystalline materials. Where their properties allow operation above that of the ubiquitous commercial material lead zirconate titanate, as well as work done to modify a promising high temperature system, for use as a material standard.

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Section: Bismuth Titanate (Bit)mentioning

confidence: 99%

Piezoelectric materials for high temperature transducers and actuators

Stevenson

Martin

Cowin

et al. 2015

J Mater Sci: Mater Electron

114

View full text Add to dashboard Cite

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“…This development was followed with many improvements that were disclosed in NASA New Technology Reports and patents [for example, Aldrich et al, 2008;Badescu et al, 2006a;2006b;Bao et al 2004;Bar-Cohen et al 1999;BarCohen and Sherrit. 2003a;2003b;Dolgin et al 2001;Sherrit et al 2001;2006;2006;2010a;2010b]. The USDC requires low axial force making it attractive for operation in low gravity environments allowing to drill and core hard formations using relatively small preload and low mass hardware.…”

Section: The Usdc Mechanismmentioning

confidence: 99%

Deep drilling and sampling via the wireline auto-gopher driven by piezoelectric percussive actuator and EM rotary motor

et al. 2012

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The ability to penetrate subsurfaces and perform sample acquisition at depths of meters is critical for future NASA in-situ exploration missions to bodies in the solar system, including Mars, Europa, and Enceladus. A corer/sampler was developed with the goal of acquiring pristine samples by reaching depths on Mars beyond the oxidized and sterilized zone. The developed rotary-hammering coring drill, called Auto-Gopher, employs a piezoelectric actuated percussive mechanism for breaking formations and an electric motor rotates the bit to remove the powdered cuttings. This sampler is a wireline drill that is incorporated with an inchworm mechanism allowing thru cyclic coring and core removal to reach great depths. The penetration rate is optimized by simultaneously activating the percussive and rotary motions of the Auto-Gopher. The percussive mechanism is based on the Ultrasonic/Sonic Drill/Corer (USDC) mechanism, which is driven by a piezoelectric stack, demonstrated to require low axial preload. The AutoGopher has been produced taking into account the lessons learned from the development of the Ultrasonic/Sonic Gopher that was designed as a percussive ice drill and was demonstrated in Antarctica in 2005 to reach about 2 meters deep. A field demonstration of the Auto-Gopher is currently being planned with the objective of reaching as deep as 3 to 5 meters in tufa formation.

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“…The modeling of the USDC has been done previously and presented in other publications [Sherrit et al, 2000;Bao et al, 2003;Sherrit et al, 2004]. ANSYS TM was used for modal and harmonic analysis of the transducer.…”

Section: Figure 4 -Transducer -Modal Nalysismentioning

confidence: 99%

Adapting the ultrasonic/sonic driller/corer for walking/climbing robotic applications

et al. 2005

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Future NASA's missions include the search for past and existing life in the Universe and evidence on how the planets in the Solar system formed and evolved. In order to fulfill these goals sampling systems that meet the stringent requirements of the various environments are required to be developed. To support these objectives an ultrasonic/sonic driller/corer (USDC) device has been developed at Jet Propulsion Laboratory (JPL) to allow drilling and coring rocks for in-situ planetary analysis [1]. The site location and method of sampling are of vital importance to scientists. Surface rocks abrasion, small depth soil drilling, and deep drilling have been proposed. It has been suggested that another possible source of mineralogical or astrobiological information can be found by exploring the sidewall of canyons. The exploration of such sites requires the development of a limbed robotic system capable of walking and climbing slopes up to and including vertical faces and overhangs. An anchor/drilling mechanism is currently under development and is being installed on each leg of the four-legged Steep Terrain Access Robot (STAR). This paper presents the modeling, design, and preliminary testing results of the USDC for use as end-effectors of walking/climbing robots.

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Novel horn designs for power ultrasonics

Cited by 37 publications

References 5 publications

Piezoelectric materials for high temperature transducers and actuators

Piezoelectric materials for high temperature transducers and actuators

Deep drilling and sampling via the wireline auto-gopher driven by piezoelectric percussive actuator and EM rotary motor

Adapting the ultrasonic/sonic driller/corer for walking/climbing robotic applications

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