Prof. Virkeshwar Kumar Profile

Prof. Virkeshwar Kumar

at Indian Institute of Technology Kanpur

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Proceedings Article | 9 May 2024 Poster + Paper

Enhancing actuation frequency of shape memory alloy-based system with a novel evaporative cooling technique for fast cyclic applications

Kanhaiya Lal Chaurasiya, Navya Gupta, Fahad Javeed, Virkeshwar Kumar, Bishakh Bhattacharya

Proceedings Volume 12946, 1294626 (2024) https://doi.org/10.1117/12.3006378

KEYWORDS: Shape memory alloys, Convection, Actuators, Acetone, Liquids, Deionized water, Computer aided design

Read Abstract +

Recent advancements in the field of material science and robotics have resulted in smart, adaptive, and intelligent systems for in-field applications. Conventional electromagnetism-based actuators contribute significantly to the size and weight of these systems, and hence, they are not suitable for mobile robots. Shape memory alloys (SMA) have emerged as better alternatives due to their unique characteristics, such as high force-to-weight ratio, noiseless operation, and muscle-like motion, with the potential to develop novel actuation for biomedical, space, and robotic applications. SMAs regain their shape at higher temperatures through the shape memory effect. This effect causes the alloy to transform its shape and then fully recover during phase transition. SMA actuators have been thoroughly examined for their potential integration into robotic hands, arms, and manipulators. However, relatively long cooling times to retransform from austenite to martensite state make SMAs unsuitable for fast and rapid cyclic applications. The current research aims to examine the effect of an evaporative (spray) cooling technique using acetone, methanol, and deionized water as cooling agents on the cooling time of SMA. Comparative studies are performed to study the effect of different coolants on a 1-DOF SMA coil actuator. Furthermore, a SMA-based rotary actuator has been developed, demonstrating the feasibility of implementing an acetone-based spray cooling technique. A control circuit is designed to regulate the spraying process over the SMA coils. This novel evaporative technique offers a significant improvement (154%) in the actuation frequency of the SMA-based actuation system compared to free convection. The findings underscore the potential of evaporative cooling methods to enhance the performance of SMA-based actuators, with implications for fast cyclic applications such as robotic systems.

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