21 to 30 of 88 Results
Jun 5, 2016
Bar-Cohen, Yoseph; Zacny, Kris; Badescu, Mircea; Lee, Hyeong Jae; Sherrit, Stewart; Bao, Xiaoqi; Freeman, David; Paulsen, Gale L.; Beegle, Luther, 2016, "Auto-gopher-2 - wireline deep sampler driven by percussive piezoelectric actuator and rotary EM motors", https://hdl.handle.net/2014/46125, CIMTEC 2016 - 7th Forum on New Materials, Perugia, Italy, June 5-9, 2016, JPL Open Repository
Two of the key purposes of future NASA’s solar system exploration of planetary bodies are the search for potentially preserved bio-signatures and for habitable regions. To address these objectives, a biologically inspired wireline deep rotary-percussive drill, called Auto-Gopher,... |
Mar 20, 2016
Badescu, Mircea; Sherritt, Stewart; Lewis, Derek; Bao, Xiaoqi; Bar-Cohen, Yoseph; Hall, Jeffrey L., 2016, "Digital valve for high pressure high flow applications", https://hdl.handle.net/2014/46058, SPIE Smart Structures/NDE 2016, Las Vegas, Nevada, March 20-24, 2016, JPL Open Repository
To address the challenges, which are involved with the development of flow control valves that can meet the requirements of deep oil wells such as high pressure, high flow rate, limited power and limited space, the authors have conceived a novel design configuration [1]. This des... |
Mar 20, 2016
Bar-Cohen, Yoseph, 2016, "Preface of the 18th Electroactive Polymers Actuators and Devices", https://hdl.handle.net/2014/46107, SPIE Smart Structures/NDE 2016, Las Vegas, Nevada, March 20-24, 2016, JPL Open Repository
No abstract provided |
Mar 20, 2016
Lih, Shyh-Shiuh; Lee, Hyeong Jae; Bar-Cohen, Yoseph, 2016, "In-situ measurement of the height of condensed water in steam pipes with dynamic flow", https://hdl.handle.net/2014/46055, SPIE Smart Structures/NDE 2016, Las Vegas, Nevada, March 20-24, 2016, JPL Open Repository
A method based on the use of enhanced filtered Hilbert envelope of the wave signal was developed in order to monitor the height of condensed water through the wall of steam pipes having dynamic flow conditions. A prototype testbed was designed and fabricated in this study to simu... |
Mar 9, 2014
Badescu, Mircea; Bao, Xiaoqi; Bar-Cohen, Yoseph, 2014, "Shape memory alloy (SMA)-based launch lock", https://hdl.handle.net/2014/45484, SPIE Smart Structures and Non-Destructive Evaluation, San Diego, California, March 9-13, 2014, JPL Open Repository
Most NASA missions require the use of a launch lock for securing moving components during the launch or securing the payload before release. A launch lock is a device used to prevent unwanted motion and secure the controlled components. The current launch locks are based on pyrot... |
Mar 9, 2014
Lee, Hyeong Jae; Bar-Cohen, Yoseph; Lih, Shyh-Shiuh; Badescu, Mircea; Dingizian, Arsham; Takano, Nobuyuki; Blosiu, Julian O., 2014, "Wireless monitoring of the height of condensed water in steam pipes", https://hdl.handle.net/2014/45483, SPIE Smart Structures and Non-Destructive Evaluation, San Diego, California, March 9-13, 2014, JPL Open Repository
A wireless health monitoring system has been developed for determining the height of water condensation in the steam pipes and the data acquisition is done remotely using a wireless network system. The developed system is designed to operate in the harsh environment encountered a... |
Mar 18, 2013
Sherrit, Stewart; Walkemeyer, Phillip; Bao, Xiaoqi; Bar-Cohen, Yoseph; Badescu, Mircea, 2013, "Acoustic mechanical feedthroughs", https://hdl.handle.net/2014/44126, 44th Lunar and Planetary Science Conference (LPSC 2013), Woodlands, Texas, March, 18–22, 2013, JPL Open Repository
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 dri... |
Mar 11, 2013
Lih, Shyh-Shiuh; Bar-Cohen, Yoseph; Lee, Hyeong Jae; Badescu, Mircea; Bao, Xiaoqi; Sherrit, Stewart; Takano, Nobuyuki; Ostlund, Patrick; Blosiu, Julian, 2013, "High temperatures health monitoring of the condensed water height in steam pipe systems", https://hdl.handle.net/2014/44130, SPIE Smart Structures and NDE Symposium, San Diego, California, March 10-14, 2013, JPL Open Repository
Ultrasonic probes were designed, fabricated and tested for high temperature health monitoring system. The goal of this work was to develop the health monitoring system that can determine the height level of the condensed water through the pipe wall at high temperature up to 250 °... |
Mar 11, 2013
Badescu, Mircea; Ressa, Aaron; Jae Lee, Hyeong; Bar-Cohen, Yoseph; Sherrit, Stewart; Zacny, Kris; Paulsen, Gale L.; Beegle, Luther; Bao, Xiaoqi, 2013, "Auto-Gopher : a wireline deep sampler driven by piezoelectric percussive actuator and EM rotary motor", https://hdl.handle.net/2014/44140, SPIE Smart Structures and NDE Symposium, San Diego, California, March 10-14, 2013, JPL Open Repository
The ability to penetrate subsurfaces and perform sample acquisition at depth of meters may be 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 enabling acquisition of sam... |
Mar 11, 2013
Lih, Shyh-Shiuh; Bar-Cohen, Yoseph; Lee, Hyeong Jae; Takano, Nobuyuki; Bao, Xiaoqi, 2013, "Advanced signal processing for high temperatures health monitoring of condensed water height in steam pipes", https://hdl.handle.net/2014/44129, SPIE Smart Structures and NDE Symposium, San Diego, California, March 10-14, 2013, JPL Open Repository
An advanced signal processing methodology is being developed to monitor the height of condensed water thru the wall of a steel pipe while operating at temperatures as high as 250°C. Using existing techniques, previous study indicated that, when the water height is low or there is... |
