Mr. Krishna Chaitanya Sunku Reddy Profile

Krishna Chaitanya Sunku Reddy

Research Scholar at VFSTR (Deemed to be Univ.)

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Proceedings Article | 13 April 2015 Paper

Design and investigation of a linear smart actuator

S. Krishna Chaitanya, K. Dhanalakshmi

Proceedings Volume 9431, 94312T (2015) https://doi.org/10.1117/12.2084502

KEYWORDS: Shape memory alloys, Actuators, Computer aided design, Resistance, Virtual colonoscopy, Solid modeling, Sensors, Metals, Aerospace engineering, Robotics

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Motors are nearly the sole constituents for actuation and driving applications, but there exist cases where their use proves to be impractical. Shape memory alloy (SMA), then revolutionized the actuator technology, thereby opening the door for new ideas and designs and with it what seemed unfeasible in the past have now become challenging. Many conventional actuators and sensors could be substituted with SMA, obtaining advantages in terms of reduction of weight, dimensions and its cost. SMAs are a group of metallic materials that revert to a predefined shape via phase transformation induced by a thermal procedure. Unlike metals that exhibit thermal expansion, SMA exhibits contraction when heated, which is larger by a hundredfold and exerts tremendous force for its small size. The focus of this work is to realize SMA wire as actuator which finds suitable applications (space, aerospace, biomechanics, etc.) where minimizing space, weight and cost are prime objectives. The accomplishments reported in this paper represent a significant development in the design of SMA actuator configurations for linear actuation. Report on design, fabrication and characterisation of the proposed system is presented. The design took advantage of converting the small linear displacement of the SMA wire into a large linear elastic motion under the influence of biasing element. From the results with control it is aspired that with further improvements on the design, the actuator can be utilized in enabling practical SMA technologies for potential robotic and commercial applications.

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