Engineering topics
Publications and source records attributed to Bar-Cohen, Y..
The USDC was developed to address the challenges to the NASA objective of planetary in-situ rock sampling analysis. A computer program was developed to simulate the operation of the USDC and successfully predicted the characteristic behavior of the new device. This paper covers the theory, the analytical models and the algorithms that were developed and predicted the results.
In this paper a variety of techniques to characterize the mechanical properties of polymers in the MHz frequency range based on the impedance analysis of thickness and thickness shear composite resonators will be presented.
This paper will be a review of the status of the EAP field and the challenges to practical application of EAP materials as actuators.
The experimental results for a variety of novel horn designs will be presented and compared to the results predicted by theory.
In-situ sampling and analysis is one of the major tasks in future NASA exploration missions. It is essential that the samples on other planets including Mars are free of contaminations from the earth. Recently, a novel drilling technology that is actuated by a piezoelectric drive mechanism was developed at it is called Ultrasonic/Sonic Driller/Corer.
IPMC is an electroactive polymer (EAP) that has been the subject of research and development since 1992. Its required low activation voltage and the large bending strain led to its consideration for various potential applications. However, before the benefits of IPMC can be effectively exploited for practical use, the electromechanical behavior of this group of EAP materials must be properly understood and quantified.
This paper talks about the increasingly feasible possibility of robots as artificial inspectors.
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This paper reviews the status of the EAP infrastructure and the challenges to practical application of EAP materials as actuators.
An experimental setup was developed for data acquisition from IPMC strips subjected to various tip mass levels and in parallel an analytical model was developed to predict ther material response.
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An Ultrasonic drilling/coring mechanism (USDC) has been developed for future NASA exploration missions.