221 to 230 of 261 Results
Mar 17, 1997
Bar-Cohen, Y.; Lih, S. S.; Mal, A. K., 1997, "(abstract) Oblique Insonification Ultrasonic NDE of Composite Materials for Space Applications", https://hdl.handle.net/2014/27659, Houston, TX, JPL Open Repository
In recent years, a great deal of research has been exerted to developing NDE methods for the characterization of the material properties of composites as well as other space structural materials. The need for information about such parameters as the elastic properties, density, a... |
Mar 17, 1997
Bar-Cohen, Y.; Lih, S.; Mal, A.K., 1997, "Oblique Insonification Ultrasonic NDE of Composite Materials for Space Applications", https://hdl.handle.net/2014/21906, Houston, Texas, USA, JPL Open Repository
No abstract provided |
Mar 3, 1997
Lih, S. S.; Bar-Cohen, Y., 1997, "Rotary Piezoelectric Motors Actuated by Traveling Waves (abstract)", https://hdl.handle.net/2014/27398, San Diego, CA, JPL Open Repository
Piezoelectric rotary motors are being developed as a drive mechanism for miniature spacecraft instruments and subsystems. The technology that has recently emerged in commercial products requires more rigorous analytical tools for effective design. The theoretical predictions and... |
Mar 3, 1997
Bar-Cohen, Y.; Xue, T.; Joffe, B.; Lih, S. S.; Willis, P.; Simpson, J.; Smith, J.; Clair, T.; Shahinpoor, M., 1997, "Low Mass Muscle Actuators (LoMMAs) Using Electroactive Polymers", https://hdl.handle.net/2014/27397, San Diego,CA, JPL Open Repository
NASA is using actuation devices for many space applications and there is an increasing need to cut their cost as well as reduce their size, mass, and power consumption. Existing transducing actuators, such as piezoceramics, are inducing limited displacement levels. Potentially, e... |
Mar 3, 1997
Bar-Cohen, Y.; Xue, T.; Joffe, B.; Lih, S. S.; Shahinpoor, M.; Simpson, J.; Smith, J.; Willis, P., 1997, "Electroactive Polymers (EAP) low Mass Muscle Actuators", https://hdl.handle.net/2014/21825, San Diego, California, USA, JPL Open Repository
Actuation devices are used for many space applications with an increasing need to reduce their size, mass, and power consumption as well as cut their cost. Existing transducing actuators, such as piezoceramics, induce limited displacement levels. Potentially, electroactive polyme... |
Mar 1, 1997
Bar-Cohen, Y.; Xue, T.; Shahinpoor, M.; Simpson, J.; Smith, J., 1997, "Flexible, Low-mass Robotic Arm Actuatd by Electroactive Polymers (EAP) and Operated Equivalently to Human Hand", https://hdl.handle.net/2014/22438, San Diego, California, USA, JPL Open Repository
No abstract provided |
Mar 1, 1997
Bar-Cohen, Y.; Bao, T.; Loertscher, H., 1997, "Rotary Ultrasonic Motors Actuated By Traveling Flexural Waves", https://hdl.handle.net/2014/22439, San Diego, California, USA, JPL Open Repository
No abstract provided |
Jan 1, 1997
Backes, P.; Bar-Cohen, Y.; Joffe, B., 1997, "The Multifunction Automated Crawling System (MACS)", https://hdl.handle.net/2014/21732, IEEE Conference on Robotics and Automation, JPL Open Repository
A new robotic crawler is being developed for inspection of large aircraft external surfaces. |
Dec 2, 1996
Bar-Cohen, Y., 1996, "Multifunction Automated Crawling System (MACS)", https://hdl.handle.net/2014/26500, Scottsdale, Arizona, USA, JPL Open Repository
Nondestructive Evaluation (NDE) instruments and sensors are becoming smaller with enhanced computer controlled capability and increasingly used commercially available hardware and software. |
Dec 2, 1996
El-Azab, A.; Mal, A. K.; Bar-Cohen, Y.; Lih, S., 1996, "Measuring the Thickness and Elastic Properties of Electroactive Thin-film Polymers Using Platewave Dispersion Data", https://hdl.handle.net/2014/26499, Scottdale, Arizona, USA, JPL Open Repository
Electroactive thin-film polymers are candidate sensors and actuators materials [1,2]. They are also finding a significant potential for applications in muscle mechanisms and micro-electro-mechanical systems (MEMS). |
