Ms. Armita Hamidi Profile

Armita Hamidi

Research/teaching assistant at Univ of Texas at Dallas

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Publications (4)

Proceedings Article | 27 March 2018 Presentation + Paper

Biorobotic systems design and development using TCP muscles

Lianjun Wu, Farzad Karami, Armita Hamidi, Yonas Tadesse

Proceedings Volume 10594, 1059417 (2018) https://doi.org/10.1117/12.2300943

KEYWORDS: Actuators, Robots, Silicon, Robotics, Artificial muscles, 3D printing, Prototyping, Manufacturing, Polymers, Biomimetics

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Proceedings Article | 10 May 2017 Presentation

Optimization of voltage output of energy harvesters with continuous mechanical rotation extracted from human motion (Conference Presentation)

Evan Rashid, Armita Hamidi, Yonas Tadesse

Proceedings Volume 10164, 101641K (2017) https://doi.org/10.1117/12.2259974

KEYWORDS: Energy harvesting, Energy efficiency, Motion models, Systems modeling, Electromagnetism, Electronic components, Smart structures, System integration, Current controlled current source

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With increasing popularity of portable devices for outdoor activities, portable energy harvesting devices are coming into spot light. The next generation energy harvester which is called hybrid energy harvester can employ more than one mechanism in a single device to optimize portion of the energy that can be harvested from any source of waste energy namely motion, vibration, heat and etc. In spite of few recent attempts for creating hybrid portable devices, the level of output energy still needs to be improved with the intention of employing them in commercial electronic systems or further applications. Moreover, implementing a practical hybrid energy harvester in different application for further investigation is still challenging. This proposal is projected to incorporate a novel approach to maximize and optimize the voltage output of hybrid energy harvesters to achieve a greater conversion efficiency normalized by the total mass of the hybrid device than the simple arithmetic sum of the individual harvesting mechanisms. The energy harvester model previously proposed by Larkin and Tadesse [1] is used as a baseline and a continuous unidirectional rotation is incorporated to maximize and optimize the output. The device harvest mechanical energy from oscillatory motion and convert it to electrical energy through electromagnetic and piezoelectric systems. The new designed mechanism upgrades the device in a way that can harvest energy from both rotational and linear motions by using magnets. Likewise, the piezoelectric section optimized to harvest at least 10% more energy. To the end, the device scaled down for tested with different sources of vibrations in the immediate environment, including machinery operation, bicycle, door motion while opening and closing and finally, human motions. Comparing the results from literature proved that current device has capability to be employed in commercial small electronic devices for enhancement of battery usage or as a backup power source. [1] Larkin, Miles, and Yonas Tadesse. "HM-EH-RT: hybrid multimodal energy harvesting from rotational and translational motions." International Journal of Smart and Nano Materials 4.4 (2013): 257-285.

Proceedings Article | 17 April 2017 Presentation + Paper

3D printing PLA and silicone elastomer structures with sugar solution support material

Armita Hamidi, Shrenik Jain, Yonas Tadesse

Proceedings Volume 10163, 101630Z (2017) https://doi.org/10.1117/12.2258689

KEYWORDS: Robots, Stereolithography, Solids, Glasses, Crystals, Temperature metrology, 3D printing, Silicon, Fused deposition modeling, Printing, Rapid manufacturing, Product engineering, Structured optical fibers

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Proceedings Article | 1 April 2016 Paper

Energy harvesting from dancing: for broadening in participation in STEM fields

Armita Hamidi, Yonas Tadesse

Proceedings Volume 9806, 98060A (2016) https://doi.org/10.1117/12.2219622

KEYWORDS: Energy harvesting, Electromagnetism, Engineering education, Mathematics, Human subjects, Video, Smart materials, Resistance, Prototyping, Robots, Ferroelectric materials, Resistors

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Energy harvesting from structure vibration, human motion or environmental source has been the focus of researchers in the past few decades. This paper proposes a novel design that is suitable to harvest energy from human motions such as dancing or physical exercise and use the device to engage young students in Science, Technology, Engineering and Math (STEM) fields and outreach activities. The energy harvester (EH) device was designed for a dominant human operational frequency range of 1–5 Hz and it can be wearable by human. We proposed to incorporate different genres of music coupled with energy harvesting technologies for motivation and energy generation. Students will learn both science and art together, since the energy harvesting requires understanding basic physical phenomena and the art enables various physical movements that imparts the largest motion transfer to the EH device. Therefore, the systems are coupled to each other. Young people follow music updates more than robotics or energy harvesting researches. Most popular videos on YouTube and VEVO are viewed more than 100 million times. Perhaps, integrating the energy harvesting research with music or physical exercise might enhance students’ engagement in science, and needs investigation. A multimodal energy harvester consisting of piezoelectric and electromagnetic subsystems, which can be wearable in the leg, is proposed in this study. Three piezoelectric cantilever beams having permanent magnets at the ends are connected to a base through a slip ring. Stationary electromagnetic coils are installed in the base and connected in series. Whenever the device is driven by any oscillation parallel to the base, the unbalanced rotor will rotate generating energy across the stationary coils in the base. In another case, if the device is driven by an oscillation perpendicular to the base, a stress will be induced within the cantilever beams generating energy across the piezoelectric materials.

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