Events | Mechanical Engineering

ME 100/200 Seminar - "Model Development for Design and Control of Nonlinear Smart Composite Systems "

October 24, 2011
Speaker
Ralph C. Smith, North Carolina State University
Location
ESB 1001
Type
Seminar
Abstract: Actuators, sensors and structural units utilizing magnetic, ferroelectric or shape memory alloy components are increasingly considered for present and emerging aerospace, aeronautic, industrial, automotive and biomedical applications.  Examples include the use of  macro-fiber composites (MFC) for flow control, magnetic transducers for high-speed milling, and shape memory alloys for laser ablation treatments of atrial fibrillation. Whereas these materials provide unique design and control capabilities, they also exhibit hysteresis and constitutive nonlinearities that must be incorporated in models in a manner that facilitates real-time implementation.  In this presentation, we will discuss the homogenized energy model which provides a unified framework for characterizing hysteresis and nonlinearities intrinsic to these materials.  In the first step of the development, energy analysis at the lattice level is used to quantify the metastability and kinetics associated with hysteresis and creep within a single grain.  Stochastic homogenization techniques are then used to construct macroscopic and system models that are appropriate for design and control implementation.  The discussion will include data-driven and statistical techniques to estimate model parameters and quantify uncertainty in the parameters and models as well as certain model-based control results. Host: Bassam Bamieh