An ultrasonic sampler and sensor platform for in-situ astrobiological exploration (2009)
Bar-Cohen, Yoseph, Bao, X., Chang, Z., Sherrit, S.
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...
NDE is now a relatively mature field and, even though accurate characterization of hidden flaws may still pose a challenge, the last century has been marked with the most incredible progress. The...
In-situ Rock Probing Using The Ultrasonic/Sonic DrilledCorer (2008)
Zensheu Cliaiig, Stewart Sherrit, Xiaoqi Bao, Yoseph Bar-cohen
Ability of in-situ sampling and analysis are iniportant capabilities to allow meeting the major objectives of future NASA’s planetary exploration niissions. The development of an ultrasonic device...
Jet Propulsion LaboratoryEaltech (2008)
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...
Adapting the Ultrasonic/Sonic Driller/Corer for Walking/Climbing Robotic Applications (2008)
Mircea Badescu, Xiaoqi Bao, Yoseph Bar-cohen, Zensheu Chang, Borna E. Dabiri, Kennedy Stewart Sherrit
Future NASA’s missions include the search for past and existing life in the Universe and evidence on how the planets in the Solar system formed and evolved. In order to fulfill these goals sampling...
WorldWide ElectroActive Polymers FROM THE EDITOR (2008)
Progress in the field of EAP is continuing to be made and as we are approaching the New Year it is great to mark 2005 for the major milestone that was accomplished. The first wrestling match contest...
Lemur IIb: a Robotic System for Steep Terrain Access (2008)
Brett Kennedy, Avi Okon, Mircea Badescu, Yoseph Bar-cohen, Zensheu Chang, Borna E. Dabiri, ...
To extract the full science potential from planetary surface operations, robots must be able to access the entire surface of the planetary body, not just the relatively level areas. Buoyed by the...
BIONIC Bionic Humans Using EAP as Artificial Muscles Reality and Challenges (2008)
For many years, the idea of a human with bionic muscles immediately conjures up science fiction images of a TV series superhuman character that was implanted with bionic muscles and portrayed with...
Biologically inspired technology using electoactive polymers (EAP) (2008)
Evolution allowed nature to introduce highly effective biological mechanisms that are incredible inspiration for innovation. Humans have always made efforts to imitate nature's inventions and we are...
Wirelessly controllable inflated electroactive polymer (EAP) reflectors (2008)
Xiaoqi Bao, Yoseph Bar-cohen, Zensheu Chang, Stewart Sherrit, Mircea Badescu
Inflatable membrane reflectors are attractive for deployable, large aperture, lightweight optical and microwave systems in micro-gravity space environment. However, any fabrication flaw or...
Jet Propulsion Laboratory/Caltech (2008)
In the last ten years, new EAP materials have emerged that exhibit large displacement in response to electrical stimulation enabling great potential for the field. To develop efficient and robust EAP...
Jet Propulsion Laboratory/Caltech (2008)
Yoseph Bar-cohen, Cynthia Breazeal
Humans throughout history have always sought to mimic the appearance, mobility, functionality, intelligent operation, and thinking process of biological creatures. This field of biologically inspired...
Biomimetics: mimicking and inspired-by biology (2008)
The evolution of nature led to the introduction of highly effective and power efficient biological mechanisms. Imitating these mechanisms offers enormous potentials for the improvement of our life...
Future Plans Publications and New Technology Reports LoMMAs Team Members (2007)
NASA is using actuation devices for many space applications. There is an increasing need for miniature, low mass, low power consuming, inexpensive actuators. Existing transducing actuators such as...
Electroactive Polymers (EAP) Characterization Methods (2007)
Electroactive polymers (EAP) are emerging as a new class of actuation materials being considered in a wide range of applications. Their large electrically induced strains (bending or extensional),...
Numerical Modeling of Single-Layer Electroactive Polymer Mirrors for (2007)
Space Applications Xiaoqi, Xiaoqi Bao, Yoseph Bar-cohen, Zensheu Chang, Stewart Sherrit
Thin-film mirrors are attractive for large apertures, lightweight optical systems and microwave antennas operating in micro-gravity environments. The surface shape of these deployable thin film...
Bar-Cohen, Yoseph, Sherrit, Stewart, Bao, Xiaoqi, Badescu, Mircea, Aldrich, Jack, Chang, Zensheu
The search for existing or past life in the Universe is one of the most important objectives of NASA’s mission. For this purpose, effective instruments that can sample and conduct in-situ...
Biologically inspired technologies using artificial muscles (2006)
One of the newest fields of biomimetics is the electroactive polymers (EAP) that are also known as artificial muscles. To take advantage of these materials, efforts are made worldwide to establish a...
Efficient electromechanical network models for wireless acoustic - electric feed - throughs (2006)
Sherrit, Stewart, Doty, Benjamin J., Badescu, Mircea, Bao, Ziaoqi, Bar-Cohen, Yoseph, Chang, Zensheu
NASA/JPL
Biomimetic actuators using electroactive polymers (EAP) as artificial muscles (2006)
Evolution has resolved many of nature’s challenges leading to lasting solutions with maximal performance and effective use of resources. Nature’s inventions have always inspired human...
Electroactive polymers as artificial muscles - reality and challenges (2006)
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...
Virtual reality robotic telesurgery simulations using MEMICA haptic system (2006)
Bar-Cohen, Yoseph, Mavroidis, Constantinos, Bouzit, Mourad, Dolgin, Benjamin, Harm, Deborah L., Kopchok, George E., ...
The authors conceived a haptic mechanism called MEMICA (Remote Mechanical Mirroring using Controlled stiffness and Actuators) that can enable the design of high dexterity, rapid response, and large...
Residue detection for real-time removal of paint from metallic surfaces (2006)
Bar-Cohen, Yoseph, Bao, Xiaoqi, Dolgin, Benjamin, Marzwell, Neville
Paint stripping from large steel ships and other metallic surfaces is a major issue in the maintenance and refurbishing of structures, and environmental concerns are greatly limiting the possible...
Androids: application of EAP as artificial muscles to entertainment industry (2006)
Hanson, D., Pioggia, G., Bar-Cohen, Yoseph, De Rossi, D.
The classic movie Metropolis (1926), which is nowadays considered a cinema milestone, has shown the possibility to build robots called androids that are science and fiction run together to realize a...
Piezoelectrically actuated miniature peristaltic pump. (2006)
Bar-Cohen, Yoseph, Chang, Zensheu
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...
Ultrasonic/sonic drilling/coring (USDC) for planetary applications (2006)
Bar-Cohen, Yoseph, Sherrit, Stewart, Dolgin, Benjamin P., Bao, Xiaqi, Chang, Zensheu, Pal, Dharmendra S., ...
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...
Characterization of the electromechanical properties of EAP materials (2006)
Bar-Cohen, Yoseph, Sherrita, Stewart, Bhattachary, Kaushik, Lih, Shyh-Shiuh
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...
Reaction force of percussive corer, rotary-friction corer, and rotary-percussive corer (2006)
Chang, Zensheu, Sherrit, Stewart, Badescu, Mircea, Bao, Xiaoqi, Bar-Cohen, Yoseph, Backes, Paul
Future NASA exploration missions will increasingly require sampling, in-situ analysis and possibly the return of material to Earth for laboratory analysis. To address these objective, effective and...
Studies of acoustic-electric feed-throughs for power transmission through structures. (2006)
Sherrit, Stewart, Doty, Benjamin, Badescu, Mircea, Bao, Xiaoqi, Bar-Cohen, Yoseph, Aldrich, Jack, ...
There are numerous engineering design problems where the use of wires to transfer power and communicate data thru the walls of a structure is prohibitive or significantly difficult that it may...
USDC based rapid penetrator of packed soil (2006)
Bao, Xiaoqi, Bar-Cohen, Yoseph, Chang, Zensheu, Sherrit, Stewart, Badescu, Mircea
Environment protection requires more testing and analysis tools. To detect buried chemical containers or other objects embedded in soil and avoid possible damages of them, a penetrator of packed soil...
Extremum-seeking control for an Ultrasonic/Sonic Driller/Corer (USDC) driven at high-power (2006)
Aldrich, Jack, Sherrit, Stewart, Bao, Xiaoqi, Bar-Cohen, Yoseph, Badescu, Mircea, Chang, Zensheu
Future NASA exploration missions will increasingly require sampling, in-situ analysis and possibly the return of material to Earth for further tests. One of the challenges to addressing this need is...
Biomimetics: using nature as an inspiring model for human innovation (2006)
The evolution of nature over 3.8 billion years led to the highly effective and power efficient biological mechanisms. Imitating these mechanisms offers enormous potentials for the improvement of our...
State-of-the-art developments in the field of electroactive polymers (2006)
Vinogradov, Aleksandra, Su, Ji, Jenkins, Christopher, Bar-Cohen, Yoseph
The paper presents a brief review in the field of electroactive polymers. it outlines the main classes of electroactive polymers, their properties and applications. Current efforts to synthesize...
Biomimetics - using nature as an inspiring model for innovation (2006)
In this presentation, various aspects of the field of biomimetics will be reviewed, examples of inspiring biological models and practical applications will be described, and challenges and potential...
Characterization of bending EAP beams (2005)
Bao, Xiaoqi, Bar-Cohen, Yoseph, Chang, Zensheu, Sherrit, Stewart
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...
Resonance analysis of high temperature piezoelectric materials for actuation and sensing (2005)
Sherrit, Stewart, Bao, Xiaoqi, Bar-Cohen, Yoseph, Chang, Zensheu
The current NASA Decadal mission planning effort has identified Venus as a significant scientific target for a surface in-situ sampling mission.
EAP as artificial muscles - progress and challenges (2005)
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...
Electroactive Polymers (EAP) as actuators for potential future planetary mechanisms (2005)
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.
Biomimetic robots using EAP as artificial muscles - progress and challenges (2005)
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,...
Bar-Cohen, Yoseph, Sherrit, Stewart, Bao, Xiaoqi, Chang, Zensheu, Lih, Shyh-Shiuh
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...
Biomimetics: using nature as an inspiring model for human innovation (2005)
The evolution of nature over 3.8 billion years led to the highly effective and power efficient biological mechanisms. Imitating these mechanisms offers enormous potentials for the improvement of our...
Design and analysis of ultrasonic horn for USDC (Ultrasonic/Sonic Driller/Corer) (2005)
Chang, Zensheu, Sherrit, Stewart, Bao, Xiaoqi, Bar-Cohen, Yoseph
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...
Bar-Cohen, Yoseph, Lih, Shyh-Shiuh, Bao, Xiaoqi, Sherrit, Stewart
A ferroelectric based multiple radiation source is being developed and tested at JPL. This device has the potential to emit five radation types enabling a new generation of compact, low power, low...
Biomimetics: biologically inspired technology (2005)
This paper reviews the various aspects of the field of biomimetics and the role that EAP play and the outlook for its evolution.
Lemur IIb: a robotic system for steep terrain (2005)
Kennedy, Brett, Okon, Avi, Aghazarian, Hrand, Badescu, Mircea, Bao, Xiaoqi, Bar-Cohen, Yoseph, ...
This paper lays out the mechanical, electrical, and algorithmic elements of the Lemur IIb robot and discusses the future directions of development in those areas.
Biomimetics: mimicking and inspired-by biology (2005)
This paper reviews the various aspects of the field of biomimetics and the role that EAP play and the outlook for its evolution.
Efficient electromechanical network models for wireless acoustic-electric feed-throughs (2005)
Sherrit, Stewart, Badescu, Mircea, Bao, Xiaoqi, Bar-Cohen, Yoseph, Chang, Zenshen
There are numerous engineering design problems where the use of wires to transfer power and communicate data thru the walls of a structure is prohibitive or significantly difficult that it may...
Integrated modeling of the Ultrasonic/Sonic Drill/Corer : procedure and analysis results (2005)
Badescu, Mircea, Bar-Cohen, Yoseph, Chang, Zensheu, Sherrit, Stewart
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...
Artificial muscles using electroactive polymers (EAP): capabilities, challenges and potential (2005)
This paper provides a review of the current status, the challenges and potential near future applications of these materials.
Optimal design of coring bit cutting edge in percussive/vibratory drilling (2005)
Bar-Cohen, Yoseph, Liu, Yinghui, Mavroidis, Constantinos, Chang, Zensheu
The objective of this study is to develop an analytical method for the optimization of the design of coring bits of vibratory drills with cutting teeth that percussively penetrate brittle material.
Bionic Humans Using EAP as Artificial Muscles Reality and Challenges (2004)
For many years, the idea of a human with bionic muscles immediately conjures up science fiction images of a TV series superhuman character that was implanted with bionic muscles and portrayed with...
Ultrasonic Evaluation of Thermal Degradation in Adhesive Bonds (2004)
Lih, Shyh-Shiuh, Mal, Ajit K., Bar-Cohen, Yoseph
The critical role played by adhesive bonds in lap joints is well known. A good knowledge of the mechanical properties of adhesive bonds in lap joints is a prerequisite to the design and reliable...
NASA NDE Working Group Newsletter, Vol. 2, No. 4 (2004)
This NNWG Newsletter is published quarterly by the NASA NDE Working Group and NASA HQ, Code QW.
Wave Propagation in Anisotropic Composite Plates (2004)
Mal, Ajit, Guo, Dawei, Bar-Cohen, Yoseph, Lih, Shyh-Shiuh
This paper is concerned with the development of wave propagation based cost-effective ultrasonic techniques for the nondestructive materials and defects characterization in advanced structural...
(abstract) Application of Space Technology to NDE at JPL (2004)
JPL is responsible for the deep space exploration using spacecraft and telerobotic technologies. Since all its missions are one of a kind and hardware dependent, the NDE requirements are...
(abstract) NDE and Advanced Actuators at JPL (2004)
JPL is responsible for deep space exploration using spacecraft and telerobotic technologies. Since all JPL's missions are one of a kind and hardware dependent, the requirements for nondestructive...
Bar-Cohen, Yoseph, Lih, Shyh-Shiuh, Mal, Ajit K.
NOne given. Paper covers properties of composite materials.
International NDT Technical Collaboration Using the Internet (2004)
Bar-Cohen, Yoseph, Diederichs, Rolf, Jones, Marty, Onoe, Morio
This paper reviews the capability of the Internet as a world-wide NDT communication tool for technical collaboration, dissemination of information and international standards. This paper was written...
Rapid Inspection of Aerospace Structures - Is It Autonomous Yet? (2004)
Bar-Cohen, Yoseph, Backes, Paul, Joffe, Benjamin
The trend to increase the usage of aging aircraft added a great deal of urgency to the ongoing need for low-cost, rapid, simple-to-operate, reliable and efficient NDE methods for detection and...
Polymer Piezoelectric Transducers for Ultrasonic NDE (2004)
Bar-Cohen, Yoseph, Xue, Tianji, Lih, Shyh-Shiuh
Piezoelectric polymers are associated with a low noise and inherent damping that makes them very effective receivers as well as broadband transmitters for high frequencies tasks. This paper reviews...
Bar-Cohen, Yoseph, Lih, Shyh-Shiuh, El-Azab, A., Mal, Ajit K.
Electroactive thin-film polymers are candidate sensors and actuators materials. They are also finding significant potential in muscle mechanisms and microelectromechanical systems (MEMS). In these...
Autonomous Rapid Inspection of Aerospace Structures (2004)
Effective assurance of the integrity and performance of aging aircraft sturnctures, particularly those that are made of composite materials, requires rapid inspection of large area. Removal from the...
Rapid Characterization of the Degradation of Composites Using Plate Waves Dispersion Data (2004)
Bar-Cohen, Yoseph, Lih, Shyh-Shiuh
NDE methods are needed to determine the structure integrity, stiffness and durability of structures and they can be extremely useful in assuring the performance of structures using smaller safety...
Autonomous Rapid Inspection of Aerospace Structures (2004)
Aging aircraft structures and composite materials are requiring rapid inspection of large areas. Removal from the aircraft for NDE at an inspection facility is not economical as compared to field...
Rotary Ultrasonic Motors Actuated by Traveling Flexural Waves (2004)
Lih, Shyh-Shiuh, Bar-Cohen, Yoseph
Ultrasonic rotary motors are being developed as acutators for miniature spacecraft insturments and subsystems. The technology that has emerged in commercial products requires rigorous analytical...
Keynote Presentation Biologically Inspired Intelligent Robots Using Artificial Muscles (2003)
Humans throughout history have always sought to mimic the appearance, mobility, functionality, intelligent operation, and thinking process of biological creatures. This field of biologically inspired...
Characterization of the electromechanical properties (2002)
Yoseph Bar-cohen, Stewart Sherrit, Shyh-shiuh Lih
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...
Measurements and macro models of ionomeric polymer-metal composites (2002)
Xiaoqi Bao, Yoseph Bar-cohen, Shyh-shiuh Lih
Ionomeric Polymer-Metal Composites (IPMC) are attractive type of electroactive polymer actuation materials because of their characteristics of large electrically induced bending, mechanical...
Characterization of the electromechanical properties (2002)
Yoseph Bar-cohen, Xiaoqi Bao, Stewart Sherrit, Shyh-shiuh Lih
IPMC is an electroactive polymer (EAP) that has been the subject of research and development since 1992. The advantages of IPMC in requiring low activation voltage and the induced large bending...
Transition of EAP material from novelty to practical applications – are we there yet (2001)
For many years, EAPs received relatively little attention due to their limited actuation capability and the small number of available materials. In the last ten years, new EAP materials have emerged...
Electroactive polymers as artificial muscles - capabilities, potentials and challenges (2000)
The low density and relative ease of shaping made polymers highly attractive for fracture critical applications such as aerospace. Polymer matrix composite materials significantly impacted the...
ELECTROACTIVE POLYMERS AS ARTIFICIAL MUSCLES CHANGING ROBOTICS PARADIGMS (2000)
For many years, electroactive polymers (EAP) received relatively little attention due to the small number of available materials and their limited actuation capability. The recent emergence of EAP...
Robotics 2000 and Space 2000. Albuquerque, NM, USA, February 28 - March 2, 2000 (2000)
Www Spaceandrobotics Org, Yoseph Bar-cohen
For many years, electroactive polymers (EAP) received relatively little attention due to the small number of available materials and their limited actuation capability. The recent emergence of EAP...
Yoseph Bar-Cohen, Constantinos Mavroidis, Charles Pfeiffer, Christopher Culbert, Darby F. Magruder
ntial tasks that Robonaut can perform. As human activity in space increases there is an increasing need for robots to perform dexterous Extra Vehicular Activity (EVA). Existing space robots are...
Nondestructive Evaluation (NDE) of Fiberglass Marine Structures State-of-the Art Review. (1998)
This report reviews the methods of nondestructive evaluation (NDE) of glass-reinforced plastics as applicable to common marine sandwich construction. Forty panels of various cored and solid...
Zhang, Q. M., Furukawa, Takeo, Bar-Cohen, Yoseph, Scheinbeim, J.
For many years, electroactive ceramic, magnetostrictive material and shape memory alloys have been the primary source of actuation materials for manipulation and mobility systems. Electroactive...
Properties of Composite Laminates Using Leaky Lamb Waves. (1998)
Chimenti,Dale E., Bar-Cohen,Yoseph
Method and system for detecting defects in the structure of a composite laminate material are described which comprise a first transducer for directing an ultrasonic beam of preselected frequency...
Bar-Cohen, Yoseph, Mal, Ajit K., Lih, Shyh-Shiuh
This paper concerned mmc in some important way and contained information about, utilized, or discussed these subjects: basic topics:, composite materials, cr pmc, data, experimental, pmc, pmc data,...