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Dive into Smart Structures: Theory and Applications

Explore smart structures and materials like piezoelectric actuators, shape memory alloys, ER/MR fluids. Learn about vibration control, health monitoring, and energy harvesting in this dynamic course. Discover how bio-mimetic systems inspire innovative designs and multifunctional wearable devices.

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Dive into Smart Structures: Theory and Applications

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  1. AE 51019: Smart Structures Instructor: Mira Mitra mira@aero.iitkgp.ernet.in

  2. Textbooks Smart Structures Theory --- I. Chopra & J. Sirohi, Cambridge University Press, 2013 Smart Structures - A. V. Srinivasan & D. M McFarland Cambridge University Press, 2001 Smart Material Systems --- D. J. Leo Wiley, 2007

  3. Evaluation Policy • Quizzes: Best two of three – 20 % • Mid-sem. Exam - 20% • Group Project - 20% • End-sem. Exam – 40%

  4. Content • Introduction to smart structures • Introduction to smart materials • Piezoelectric actuators & sensors • Fundamentals of piezoelectricity • Basic piezoceramic characteristics • Electromechanical constitutive equations • Modeling of piezoelectric actuators • Modeling of piezoelectric sensors

  5. Shape Memory Alloys (SMA) • Fundamentals of shape memory behavior • Constitutive modeling • Actuation models of SMA • Electrical activation of SMA • Electrorheological (ER) & Magnetorheological (MR) Fluids • Fundamental composition & behavior of ER/MR fluids • Modeling of ER/MR fluid behavior • Modeling of ER/MR fluid damper

  6. Applications of smart structures • Vibration control • Structural Health Monitoring • Energy Harvesting • Project presentation by students

  7. What is a “Smart” system? (intelligent, adaptive, active, sensory) Twentieth century definition: A system with the capability to adapt their characteristics/behavior as required, monitor their health condition, perform self-diagnosis & self-repair. Twenty first century definition: Materials with extraordinary/multi functionalities (synthesized at the atomic & molecular level, nano-structured materials, through smart designs) Underlying inspiration and goal: Bio-mimetic systems

  8. Smart Band-Aid Nanoscale membranes embedded into a stretchable, sticky fabric can detect tiny movements, deliver drugs and store all the necessary data Multifunctional wearable devices for diagnosis and therapy of movement disorders, Nature Nanotechnology, March 2014, Son et al.

  9. Smart Fabric/E-textile • adapts to changing temperatureby opening when warm or shutting tight if cold Source: Wikipedia

  10. Source: telegraph.co.uk

  11. Platelet TechnologyTM • Brinker Technology Platelet TechnologyTM • discrete particles released into pressurised pipe flow • when particles encounter modified flow at a leak, fluid forces entrain them into the leak and hold them against the pipe wall • seals and marks the position of the leak for subsequent detection. (All figures courtesy of Brinker Technology)

  12. Biomimetics: Lotus effect • most efficient self-cleaning plant • mimicked in paints andother surface coatings • pipe cleaning in oil refineries (Norway) Source: Wikipedia

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