21 to 28 of 28 Results
Mar 7, 2005
Bao, Xiaoqi; Bar-Cohen, Yoseph; Chang, Zensheu; Sherrit, Stewart; Badescu, Mircea, 2005, "Wirelessly controllable inflated electroactive polymer (EAP) reflectors", https://hdl.handle.net/2014/41476, Electroactive Polymer Actuators and Devices (EAPADI ) Conference, Smart Structures and Materials Symposium, San Diego, California, March 7-10, 2005, JPL Open Repository
Inflatable membrane reflectors are attractive for deployable, large aperture, lightweight optical and microwave systems in micro-gravity space environment. However, any fabrication flaw or temperature variation may results in significant aberration of the surface. Even for a perf... |
Mar 1, 2005
Badescu, Mircea; Bar-Cohen, Yoseph; Chang, Zensheu; Sherrit, Stewart, 2005, "Integrated modeling of the Ultrasonic/Sonic Drill/Corer : procedure and analysis results", https://hdl.handle.net/2014/37636, ISmart Structures and Integrated Systems Conference, San Diego, CA, March 7 - 10, 2005, JPL Open Repository
Rock and soil penetration by coring and drilling or abrading is of great importance for a large number of space and earth applications. An Ultrasonic/Sonic Drill/Corer has been developed as an adaptable tool to many of these applications |
Aug 1, 2004
Bar-Cohen, Yoseph; Sherrit, Stewart; Bao, Xiaoqi; Chang, Zensheu; Lih, Shyh-Shiuh, 2004, "Enabling novel planetary and terrestrial mechanisms using electroactive materials at the JPL's NDEAA Lab", https://hdl.handle.net/2014/38153, 2004 International Conference on NEMS, NANO, and Smarth Systems (ICMENS 2004), Banff, Canada, August 25, 2004, JPL Open Repository
Increasingly, electroactive materials are used to produce acutators, sensors, displays and other elements of mechanisms and devices. In recognition of the potential of these materials, research at the JPL's NDEAA Lab have led to many novel space and terrestrial applications. This... |
Mar 1, 2004
Chang, Zensheu; Sherrit, Stewart; Bao, Xiaoqi; Bar-Cohen, Yoseph, 2004, "Design and analysis of ultrasonic horn for USDC (Ultrasonic/Sonic Driller/Corer)", https://hdl.handle.net/2014/37878, SPIE Smart Structure and Materials 2004, San Diego, CA, March 17, 2004, JPL Open Repository
In-situ sampling and analysis is one of the major tasks in future NASA exploration missions. Existing drilling techniques are limited by the need for large axial forces, holding torques, and high power consumption. |
Mar 1, 2004
Bao, Xiaoqi; Bar-Cohen, Yoseph; Chang, Zensheu; Sherrit, Stewart, 2004, "Characterization of bending EAP beams", https://hdl.handle.net/2014/38240, SPIE 11th Annual International Symposium on Smart Structures and Materials, San Diego, CA, March 14-18, 2004, JPL Open Repository
Electroactive polymers are attractive actuation materials because of their large deformation, flexibility, and lightweight. A CCD camera system was constructed to record the curved shapes of bending during the activation of EAP films and image-processing software was developed to... |
Mar 1, 2004
Sherrit, Stewart; Bao, Xiaoqi; Bar-Cohen, Yoseph; Chang, Zensheu, 2004, "Resonance analysis of high temperature piezoelectric materials for actuation and sensing", https://hdl.handle.net/2014/38241, SPIE Smart Structures and Materials, San Diego, CA, March 15-18, 2004, JPL Open Repository
The current NASA Decadal mission planning effort has identified Venus as a significant scientific target for a surface in-situ sampling mission. |
Mar 5, 2001
Bar-Cohen, Yoseph; Sherrit, Stewart; Dolgin, Benjamin P.; Bao, Xiaqi; Chang, Zensheu; Pal, Dharmendra S.; Du, Shu; Peterson, Thomas, 2001, "Ultrasonic/sonic drilling/coring (USDC) for planetary applications", https://hdl.handle.net/2014/39263, 8th Annual International Symposium on Smart Structures, Newport Beach, California, March 5-8, 2001., JPL Open Repository
One of the major limitations of sampling on Mars and other low gravity environments is the need for high axial force when using conventional drilling. To address this limitation an ultrasonic/sonic drilling/coring (USDC) mechanism has been developed that employs an ultrasonic hor... |
Mar 5, 2001
Bar-Cohen, Yoseph; Chang, Zensheu, 2001, "Piezoelectrically actuated miniature peristaltic pump.", https://hdl.handle.net/2014/39262, 8th Annual International Symposium on Smart Structures, Newport Beach, California, March 5-8, 2001., JPL Open Repository
There is a range of NASA experiments, instruments and applications where miniature pumps are needed. To address such needs, a piezoelectrically actuated miniature pump is being developed. This pump employs a novel volume displacing mechanism using flexural traveling waves that ac... |
