31 to 40 of 65 Results
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
Badescu, Mircea; Sherrit, Stewart; Bao, Xiaogi; Bar-Cohen, Yoseph; Chen, Beck, 2011, "Auto-Gopher : a wire-line rotary-hammer ultrasonic drill.", https://hdl.handle.net/2014/41989, ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, San Diego, California, Mary 7-11, 2011., JPL Open Repository
Developing technologies that would enable NASA to sample rock, soil, and ice by coring, drilling or abrading at a significant depth is of great importance for a large number of in-situ exploration missions as well as for earth applications. Proven techniques to sample Mars subsur... |
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
Bao, Xiaoqi; Bar-Cohen, Yoseph; Scott, James; Sherrit, Stewart; Widholm, Scott; Badescu, Mircea, 2010, "Ultrasonic/sonic drill for high temperature application", https://hdl.handle.net/2014/44789, 12th SPIE Conference - Electroactive Polymer Actuators and Devices(EAPAD), San Diego, California, March 7-11, 2010, JPL Open Repository
Venus is one of the many significant scientific targets for NASA. New rock sampling tools with the ability to be operated at high temperatures of the order of 460°C are required for surface in-situ sampling/analysis missions. Piezoelectric materials such as LiNbO₃ crystals and Bi... |
