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61 to 65 of 65 Results
Design and analysis of ultrasonic horn for USDC (Ultrasonic/Sonic Driller/Corer)
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.
Characterization of bending EAP beams
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...
Resonance analysis of high temperature piezoelectric materials for actuation and sensing
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.
Ultrasonic/sonic drilling/coring (USDC) for planetary applications
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...
Characterization of the electromechanical properties of EAP materials
Mar 5, 2001
Bar-Cohen, Yoseph; Sherrit, Stewart; Bhattachary, Kaushik; Lih, Shyh-Shiuh, 2001, "Characterization of the electromechanical properties of EAP materials", https://hdl.handle.net/2014/39265, 8th Annual International Symposium on Smart Structures, Newport Beach, California, March 5-8, 2001., JPL Open Repository
Electroactive polymers (EAP) are an emerging class of actuation materials. Their large electrically induced strains (longitudinal or bending), low density, mechanical flexibility, and ease of processing offer advantages over traditional electroactive materials. However, before th...
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