31 to 40 of 62 Results
Jun 28, 2012
Bar-Cohen, Yoseph; Sherrit, Stewart; Badescu, Mircea; Bao, Xiaoqi; Chang, Zensheu, 2012, "Piezoelectric actuated drills developed at JPL and the Percussive Augmenter of Rotary Drills (PARoD)", https://hdl.handle.net/2014/42442, Presentation to Schlumberger and Placidus, Pasadena, California, June 28, 2012, JPL Open Repository
No abstract provided |
Apr 16, 2012
Bar-Cohen, Yoseph; Sherrit, Stewart; Badescu, Mircea; Bao, Xiaoqi, 2012, "Drilling, coring and sampling using piezoelectric actuated mechanisms : From the USDC to a piezo-rotary-hammer drill", https://hdl.handle.net/2014/42472, 2012 Earth and Space Conference : Symposium 2: Exploration and Utilization of Extraterrestrial Bodies, Pasadena, California, April 15-18, 2012, JPL Open Repository
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 hardn... |
Mar 12, 2012
Bar-Cohen, Yoseph; Badescu, Mircea; Sherrit, Stewart; Zacny, Kris; Paulsen, Gale L; Beegle, Luther; Bao, Xiaoqi, 2012, "Deep drilling and sampling via the wireline auto-gopher driven by piezoelectric percussive actuator and EM rotary motor", https://hdl.handle.net/2014/42460, SPIE Smart Structures and Materials/NDE Symposium, San Diego, California, March 10-14, 2012, JPL Open Repository
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 and Europa. A corer/sampler was developed with the goal of acquiring pristine samples by... |
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
Bao, Xiaoqi; Bar-Cohen, Yoseph; Sherrit, Stewart; Badescu, Mircea; Shrout, Tom, 2012, "High temperature piezoelectric drill", https://hdl.handle.net/2014/42459, SPIE Smart Structures and Materials/NDE Symposium, San Diego, California, March 10-14, 2012, JPL Open Repository
Venus is one of the planets in the solar systems that are considered for potential future exploration missions. It has extreme environment where the average temperature is 460°C and its ambient pressure is about 90 atm. Since the existing actuation technology cannot maintain func... |
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
Bar-Cohen, Yoseph; Lih, Shyh-Shiuh; Badescu, Mircea; Bao, Xiaoqi; Sherrit, Stewart; Widholm, Scott; Ostlund, Patrick; Blosiu, Julian, 2011, "High temperature monitoring the height of condensed water in steam pipes", https://hdl.handle.net/2014/41969, SPIE Smart Structures and Materials/NDE Symposium, San Diego, CA, March 7-10, 2011, JPL Open Repository
An in-service health monitoring system is needed for steam pipes to track through their wall the condensation of water. The system is required to measure the height of the condensed water inside the pipe while operating at temperatures that are as high as 250 deg. C. The system n... |
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... |
