Design and Development of a Sun Tracking Mechanism Using the Direct SMA Actuation

Ganesh, N.; Maniprakash, S.; Chandrasekaran, L.; Srinivasan, Sivakumar M.; Srinivasa, Arun R.

doi:10.1115/1.4004380

Cited by 29 publications

(19 citation statements)

References 5 publications

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“…Ganesh and co-workers [81] have attempted to design a simple "sun tracking mechanism (SSTM)" to illustrate the dual sensing and actuating capability of SMA components. The solar receptor position is automatically changed over the course of the day by using the solar radiation to actuate the SMA springs [81].…”

Section: Miscellaneous Applicationsmentioning

confidence: 99%

“…As described in Fig. 1.19, the use of such smart SMA springs considerably reduces the number of working elements as compared against a convectional sun tracking system that employs separate sensor and actuator for providing system level response [81].…”

Section: Miscellaneous Applicationsmentioning

confidence: 99%

“…The solar receptor position is automatically changed over the course of the day by using the solar radiation to actuate the SMA springs [81]. As described in Fig.…”

Section: Miscellaneous Applicationsmentioning

confidence: 99%

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Introduction to Shape Memory Alloys

Rao

Srinivasa

Reddy

2015

Design of Shape Memory Alloy (SMA) Actuators

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Classical materials like metals and alloys have played a significant role as structural materials for many centuries [1]. Engineers have designed components and selected alloys by employing the classical engineering approach of understanding the macroscopic properties of the material and selecting the appropriate one to match the desired functionality based on the application [2]. With advancements in material science and with increasing space and logistical limitations, scientists have been constantly developing high performing materials for various applications [2]. The everlasting goal for engineers in many cases is to improve product efficiency and reduce its weight without comprising on either its cost or performance. To achieve this goal, replacing multi-component and multi-material systems with fewer multifunctional light weight, high performing materials has been an attractive alternative [2,3]. Such advanced materials have played a leading role in the development of many engineering innovations and achievements like the Airbus A380, Boeing 787 Dreamliner, reliable fuel efficient cars, superior drug delivery devices, and so on, to list a few. The ingenious commercial products across various engineering disciplines are meeting all requirements by encompassing many of the latest technologies and meeting the challenges of tomorrow's needs.In pursuit of this, material scientists over the last few decades have focused on the possibility of tailoring the microstructure of the material to generate the required functionality for different applications [2,4]. Such an effort has resulted in an entire new area of active or multifunctional materials that posses more than one desirable property [5,6]. With the introduction of such materials, researchers are now focusing on how the combined microstructural changes of such materials are able to perform multiple functions. The integration of multiple functions like actuation, sensing, and control into a single structure using one or more material constituent is seen as a possibility [2,3]. Mamoda in her recent review of future materials discusses some application ideas with such materials like: a smart solar panel that can change its orientation automatically during the day depending on sun's position; a smart shock

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Section: Miscellaneous Applicationsmentioning

confidence: 99%

Section: Miscellaneous Applicationsmentioning

confidence: 99%

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Introduction to Shape Memory Alloys

Rao

Srinivasa

Reddy

2015

Design of Shape Memory Alloy (SMA) Actuators

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“…The SMA taken up for the design was a Ti-Ni alloy with an A s = 55 • C. The effective high temperature austenite shear modulus G H of the spring made of this alloy was taken as 20.7 GPa while the effective shear modulus G L for springs in the low temperature martensitic state was taken as 2.75 GPa (see page 52 of [3]). 2 The spring we are about to design is a compression spring. Such springs tend to have a longer life and further they have the advantage that they can be made to be "coil bound," that is, in a state where the coils are touching.…”

Section: Statement Of Requirementmentioning

confidence: 99%

“…We compute the length as 2 Stroke limiter system to limit maximum strain on SMA component (wire/spring) and also to limit the stress on the SMA at low temperatures follows. First, we calculate the strain in the wire at high temperature (using a Young's modulus of E = 75 GPa) as…”

Section: Choice Of Number Of Wires and Wire Diameter The Wire Diametmentioning

confidence: 99%

Case Studies in the Preliminary Design of SMA Actuators

Rao

Srinivasa

Reddy

2015

Design of Shape Memory Alloy (SMA) Actuators

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In spite of the rather complex and hysteretic behavior of SMA components (wires and springs), and the complex changes that occur in their microstructures, the preliminary design of SMA wires and springs turns out to be reasonably simple provided we utilize their shape memory characteristics in specific ways. Designing SMA actuators requires defining actuation intervals (temperature profile), load levels and/or displacement outputs over its intended designed life. The alloy composition dictates the transformation temperatures and the component's operating range. SMA components could be functional under load controlled or displacement controlled or simultaneous load and displacement controlled setups. Broadly, if we follow the two key principles explained below, we will be able to design a "two-state" actuator rather simply.

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Development of an Automated Experimental System for Thermomechanical and Electrical Characterization of NiTi Shape Memory Alloys

Rodinò,

Siciliano,

Curcio

et al. 2024

Exp Mech

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Background Comprehensive datasets quantifying the coupled thermo-mechanical and electrical properties of shape memory alloys (SMAs) are lacking, as are standardized techniques for robust characterization. This hampers accurate modeling and design of SMA-based components. Objective: This work develops an automated experimental system to enable simultaneous measurement of stress-strain-temperature behavior and electrical resistivity evolution in NiTi SMA wires under controlled stress conditions. Methods: Customized test frames apply precise mechanical stresses while allowing for in situ electrical measurements and infrared imaging during complete thermal cycling protocols. Specialized instrumentation including a Keithley 2002 multimeter, Agilent E3631A programmable power supply, and FLIR A615 thermal camera are integrated with LabVIEW-based software routines for complete automation of the characterization process. Rigorous metrology principles are implemented throughout the measurement procedure to improve accuracy, repeatability, and consistency compared to prior manual techniques. Results: Extensive datasets are generated which reveal pronounced stress-dependencies in key SMA material parameters including transformation temperatures, recoverable strain, and electrical resistivity. A 3D regression model describes the comprehensive relationship between resistivity, temperature, and applied stress across the entire characterization domain. Conclusions: The automated measurement framework and methodology establishes a foundation for high-fidelity, reliable acquisition of coupled SMA property data. This will enable more accurate modeling and design of components and systems incorporating SMA actuation or sensing functions.

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Design and Development of a Sun Tracking Mechanism Using the Direct SMA Actuation

Cited by 29 publications

References 5 publications

Introduction to Shape Memory Alloys

Introduction to Shape Memory Alloys

Case Studies in the Preliminary Design of SMA Actuators

Development of an Automated Experimental System for Thermomechanical and Electrical Characterization of NiTi Shape Memory Alloys

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