Mr. Nareg Shirajian Profile

Nareg Shirajian

at Jet Propulsion Lab

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Publications (3)

Proceedings Article | 9 May 2024 Paper

Piezoelectric motor for cryogenic applications

Mircea Badescu, Yoseph Bar-Cohen, Stewart Sherrit, Hyeong Jae Lee, Nareg Shirajian, Luke Alvidrez, Justin Scheidler

Proceedings Volume 12949, 129490I (2024) https://doi.org/10.1117/12.3026845

KEYWORDS: Actuators, Ferroelectric materials, Vibration, Cryogenics, Transducers, Piezoelectric materials, Industrial applications, Finite element methods

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Expanding the capabilities that are used in the NASA’s exploration of planetary bodies in our solar system would require mechanisms and actuators that can operate at cryogenic temperatures (-240 °C to -60 °C) in dusty environments. These applications include the exploration of lunar surface environments with temperatures that are below -100 °C. For this purpose, the authors are working on developing piezoelectric motors capable of operating at such extreme conditions. Novel piezoelectric motors were conceived and are being investigated to enable precision deployment and motion mechanisms that can be used for potential actuation of antennas and solar arrays, lower power robot arms, and percussive drills. This motor technology is intended to be integrated in a testbed developed at NASA to demonstrate its capabilities once it has been characterized at room temperature. These motors are being developed as game changers for enabling rotational drive mechanisms (rovers, robots, gimbals, drills, etc.) in extremely cold and dusty environments. These drive systems will be operated without the use of heaters or atmospheric control chambers (which eliminates grease lubrication) to raise the actuator’s temperature. Further, these motors will enable actuation of very high precision mechanisms having lower power motion without gears or gear lubrication, backlash, or power consumption to hold position. These actuators contain piezoelectrically-excited fixtures that are vibrated out of phase such that they sequentially push the rotor to produce continuous rotation. A proof-of-concept linear actuator that uses fixtures with flexure-preloaded piezoelectric stacks and operates in an inch-worm configuration at low frequency has been developed and demonstrated. Further, a proof-of-concept rotary actuator is currently being developed that uses a V-shaped piezoelectric fixture driven in resonance that generates an elliptical motion at the horn tip to drive a rotor. In this paper, the latest progress will be presented.

Proceedings Article | 25 April 2023 Presentation + Paper

On detecting regional inhomogeneity in composite plates using Lamb waves

Christoph Schaal, Melissa Chow, Paula Logozzo, Nareg Shirajian, Steffen Tai

Proceedings Volume 12488, 1248803 (2023) https://doi.org/10.1117/12.2657344

KEYWORDS: Transducers, Ultrasound transducers, Composites, Actuators, Signal to noise ratio, Nondestructive evaluation, Inhomogeneities, Wave propagation, Mode shapes

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Proceedings Article | 22 March 2021 Presentation + Paper

Sample return containerization and planetary protection using brazing for breaking the chain of contact to Mars

Yoseph Bar-Cohen, Mircea Badescu, Hyeong Jae Lee, Stewart Sherrit, Xiaoqi Bao, Nareg Shirajian

Proceedings Volume 11591, 115910T (2021) https://doi.org/10.1117/12.2581526

KEYWORDS: Mars, Carbon, Biological research

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