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31 to 40 of 141 Results
The Auto-Gopher: a wireline rotary-percussive deep sampler
Apr 11, 2016
Bar-Cohen, Yoseph; Zacny, Kris; Badescu, Mircea; Lee, Hyeong Jae; Sherrit, Stewart; Bao, Xiaoqi; Paulsen, Gale L.; Beegle, Luther, 2016, "The Auto-Gopher: a wireline rotary-percussive deep sampler", https://hdl.handle.net/2014/45800, ASCE Earth and Space 2016 Conference, Orlando, Florida, April 11-15, 2016, JPL Open Repository
The Auto-Gopher was developed to access regions on planetary bodies that potentially preserve biosignatures or are presently habitable that are vital to meeting search for life exploration objectives.
In-situ measurement of the height of condensed water in steam pipes with dynamic flow
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...
Digital valve for high pressure high flow applications
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...
Preface of the 18th Electroactive Polymers Actuators and Devices
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
Signal processing for determining water height in steam pipes with dynamic surface conditions
Mar 8, 2015
Lih, Shyh-Shiuh; Lee, Hyeong Jae; Bar-Cohen, Yoseph, 2015, "Signal processing for determining water height in steam pipes with dynamic surface conditions", https://hdl.handle.net/2014/45716, SPIE Smart Structures, San Diego, California, March 8-12, 2015, JPL Open Repository
An enhanced signal processing method based on the filtered Hilbert envelope of the auto-correlation function of the wave signal has been developed to monitor the height of condensed water through the steel wall of steam pipes with dynamic surface conditions.
Thermal analysis of brazing seal and sterilizing technique to break contamination chain for Mars sample return
Mar 8, 2015
Bao, Xiaoqi; Badescu, Mircea; Bar-Cohen, Yoseph, 2015, "Thermal analysis of brazing seal and sterilizing technique to break contamination chain for Mars sample return", https://hdl.handle.net/2014/45712, SPIE Smart Structures, San Diego, California, March 8-12, 2015, JPL Open Repository
The results show that the sealing and sterilization process can be controlled such that the samples' temperature is maintained below the potentially required level.
Actuators using piezoelectric stacks and displacement enhancers
Mar 8, 2015
Bar-Cohen, Yoseph; Sherrit, Stewart; Bao, Xiaoqi; Badescu, Mircea; Lee, Hyeong Jae; Walkenmeyer, Phillip; Lih, Shyh-Shiuh, 2015, "Actuators using piezoelectric stacks and displacement enhancers", https://hdl.handle.net/2014/45715, SPIE Smart Structures, San Diego, California, March 8-12, 2015, JPL Open Repository
The developed actuators and performance will be described and discussed in this paper.
Shape memory alloy (SMA)-based launch lock
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...
Wireless monitoring of the height of condensed water in steam pipes
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...
Acoustic mechanical feedthroughs
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...
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