101 to 110 of 141 Results
Jun 1, 2004
Bar-Cohen, Yoseph, 2004, "Electroactive Polymers (EAP) as actuators for potential future planetary mechanisms", https://hdl.handle.net/2014/38143, 6th NASA/DoD Conference on Evolvable Hardware (EH-2004), Seattle, Washington, June 24, 2004, JPL Open Repository
This paper provides backgrund about these materials and it includes a review of the state of the art, challenges and potential applications of these materials for future space missions. |
May 1, 2004
Bar-Cohen, Yoseph, 2004, "Biomimetic robots using EAP as artificial muscles - progress and challenges", https://hdl.handle.net/2014/38142, 2nd Conference on Artificial Muscles - Biomimetic System Engineering, Kansai, Japan, May 20, 2004, JPL Open Repository
Biology offers a great model for emulation in areas ranging from tools, computational algorithms, materials science, mechanisms and information technology. In recent years, the field of biomimetics, namely mimicking biology, has blossomed with significant advances enabling the re... |
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
Bar-Cohen, Yoseph, 2004, "EAP as artificial muscles - progress and challenges", https://hdl.handle.net/2014/38144, SPIE's Electroactive Polymer Actuators and Devices (EAPAD) Conference, San Diego, CA, March 15, 2004, JPL Open Repository
During the last decade and a half new polymers have emerged that respond to electrical stimulation with a significant shape or size change. This capability of electroactive polymer (EAP) materials is attracting the attention of engineers and scientists from many different discipl... |
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
Bar-Cohen, Yoseph, 2004, "Electroactive polymers as artificial muscles: reality, potential and challenges", https://hdl.handle.net/2014/38252, SPIE's EAPAD Conference, San Diego, CA, March 14, 2004, JPL Open Repository
No abstract provided |
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 3, 2003
Bar-Cohen, Yoseph; Bao, X.; Chang, Z.; Sherrit, S., 2003, "An ultrasonic sampler and sensor platform for in-situ astrobiological exploration", https://hdl.handle.net/2014/41159, Proceedings ofthe SPIE Smart Structures and Materials Symposium, San Diego, California, March 3-6, 2003, JPL Open Repository
The search for existing or past life in the Universe is one of the most important objectives of NASA's mission. In support of this objective, ultrasonic based mechanisms are currently being developed at JPL to allow probing and sampling rocks as well as perform as a sensor platfo... |
Apr 16, 2001
Bar-Cohen, Yoseph, 2001, "Electroactive polymers as artificial muscles - reality and challenges", https://hdl.handle.net/2014/39305, Structure, Structural, Dynamics and Materials Conference, Seattle, Washington, April 16-19, 2001., JPL Open Repository
For many years, electroactive polymers (EAP) received reIatively little attention due to the small number of available materials and their limited actuation capability. The recent emergence of EAP materials with large displacement response changed the potential capability and par... |
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... |
