1 to 10 of 24 Results
Mar 11, 2013
Badescu, Mircea; Hasenoehrl, Jennifer; Bar-Cohen, Yoseph; Sherrit, Stewart; Bao, Xiaoqi; Chang, Zensheu; Ostlund, Patrick; Aldrich, Jack, 2013, "Percussive augmenter of rotary drills (PARoD)", https://hdl.handle.net/2014/44138, SPIE Smart Structures and NDE Symposium, San Diego, California, March 10-14, 2013, JPL Open Repository
Increasingly, NASA exploration mission objectives include sample acquisition tasks for in-situ analysis or for potential sample return to Earth. To address the requirements for samplers that could be operated at the conditions of the various bodies in the solar system, a piezoele... |
Mar 12, 2012
Badescu, Mircea; Bar-Cohen, Yoseph; Sherrit, Stewart; Bao, Xiaoqi; Chang, Zensheu; Donnelly, Chris; Aldrich, Jack, 2012, "Percussive Augmenter of Rotary Drills (PARoD)", https://hdl.handle.net/2014/42456, SPIE Smart Structures and Materials/NDE Symposium, San Diego, California, March, JPL Open Repository
Increasingly, NASA exploration mission objectives include sample acquisition tasks for in-situ analysis or for potential sample return to Earth. To address the requirements for samplers that could be operated at the conditions of the various bodies in the solar system, a piezoele... |
Mar 12, 2012
Sherrit, Stewart; Ostlund, Patrick N.; Chang, Zensheu; Bao, Xiaoqi; Bar-Cohen, Yoseph; Widholm, Scott E.; Badescu, Mircea, 2012, "Miniaturization of planar horn motors", https://hdl.handle.net/2014/42425, SPIE Smart Structures/NDE Conference, San Diego, California, March 3, 2012., JPL Open Repository
There is a great need for compact, efficient motors for driving various mechanisms including robots or mobility platforms. A study is currently underway to develop a new type of piezoelectric actuators with significantly more strength, low mass, small footprint, and efficiency. T... |
Mar 11, 2012
Sherrit, Stewart; Domm, Lukas; Bao, Xiaoqi; Bar-Cohen, Yoseph; Chang, Zensheu; Badescu, Mircea, 2012, "Single Piezo-Actuator Rotary-Hammering (SPaRH) drill", https://hdl.handle.net/2014/42457, SPIE Smart Structures and Materials/NDE Symposium, San Diego, California, March 10-14, 2012, JPL Open Repository
The search for present or past life in the Universe is one of the most important objectives of NASA’s exploration missions. Drills for subsurface sampling of rocks, ice and permafrost are an essential tool for astrobiology studies on other planets. Increasingly, it is recognized... |
Mar 7, 2011
Bao, Xiaoqi; Badescu, Mircea; Bar-Cohen, Yoseph; Lih, Shyh-Shiuh; Sherrit, Stewart; Chang, Zensheu; Chen, Beck; Widholm, Scott; Ostlund, Patrick, 2011, "Sensor for direct measurement of the boundary shear stress in fluid flow", https://hdl.handle.net/2014/43464, Proceedings of the Smart Structures Symposium, San Diego, California, March 6-10, 2011., JPL Open Repository
The formation of scour patterns at bridge piers is driven by the forces at the boundary of the water flow. In most experimental scour studies, indirect processes have been applied to estimate the shear and normal stress using measured velocity profiles. The estimations are based... |
Mar 7, 2011
Bao, Xiaoqi; Badescu, Mircea; Bar-Cohen, Yoseph; Lih, Shyh-Shiuh; Sherrit, Stewart; Chang, Zensheu; Chen, Beck; Widholm, Scott; Ostlund, Patrick, 2011, "Sensor for direct measurement of the boundary shear stress in fluid flow", https://hdl.handle.net/2014/41997, 18th Annual International Symposium on Smart Structures/ NDE, San Diego, California, March 7-10, 2011, JPL Open Repository
The formation of scour patterns at bridge piers is driven by the forces at the boundary of the water flow. In most experimental scour studies, indirect processes have been applied to estimate the shear and normal stress using measured velocity profiles. The estimations are based... |
Mar 6, 2011
Sherrit, Stewart; Bao, Xiaoqi; Badescu, Mircea; Chang, Zensheu; Geiyer, Daniel; Allen, Phillip; Ostlund, Patrick; Bar-Cohen, Yoseph, 2011, "Planar rotary motor using ultrasonic horns", https://hdl.handle.net/2014/41977, 18th Annual Symposium on Smart Structures and Materials & Nondestructive Evaluation and Health Monitoring, San Diego, CA, March 6-10, 2011., JPL Open Repository
One of the first piezoelectric motor designs with significant rotational speeds was outlined by Barth. This device used extensional piezoelectric elements to produce a time varying force at a distance r from the center of a centrally supported disk. These extensional actuators pr... |
Mar 7, 2010
Badescu, Mircea; Bao, Xiaoqi; Bar-Cohen, Yoseph; Chang, Zensheu; Kerenyi, Kornel; Lih, Shyh-Shiuh; Sherrit, Stewart; Trease, Brian P.; Widholm, Scott, 2010, "Direct measurement sensor of the boundary shear stress in fluid flow", https://hdl.handle.net/2014/44792, 12th SPIE Conference - Electroactive Polymer Actuators and Devices(EAPAD), San Diego, California, March 7-11, 2010, JPL Open Repository
The flow fields and boundary erosion that are associated with scour at bridge piers are very complex. Direct measurement of the boundary shear stress and boundary pressure fluctuations in experimental scour research has always been a challenge and high spatial resolution and fide... |
Mar 9, 2008
Bao, Xiaoqi; Biederman, Will; Sherrit, Stewart; Badescu, Mircea; Bar-Cohen, Yoseph; Jones, Christopher; Aldrich, Jack; Chang, Zensheu, 2008, "High-power piezoelectric acoustic-electric power feedthru for metal walls", https://hdl.handle.net/2014/44817, 2008 SPIE Conference on Smart Structures and Materials, San Diego, California, March 9-13, 2008, JPL Open Repository
Piezoelectric acoustic-electric power feed-through devices transfer electric power wirelessly through a solid wall by using acoustic waves. This approach allows for the removal of holes through structures. The technology is applicable to power supply for electric equipment inside... |
Jun 27, 2006
Bar-Cohen, Yoseph; Sherrit, Stewart; Bao, Xiaoqi; Badescu, Mircea; Aldrich, Jack; Chang, Zensheu, 2006, "Ultrasonic/sonic driller/corer (USDC) as a subsurface sampler and sensors platform for planetary exploration applications", https://hdl.handle.net/2014/39725, 4th International Planetary Probe Workshop, Pasadena, California, June 27-30, 2006., JPL Open Repository
The search for existing or past life in the Universe is one of the most important objectives of NASA’s mission. For this purpose, effective instruments that can sample and conduct in-situ astrobiology analysis are being developed. In support of this objective, a series of novel m... |
