Chief, Systems Integration Division
National Institute of Standards and Technology
The notion of geometric composability of engineered physical systems is closely related to that of geometric interchangeability. In the engineering parlance two manufactured part instances are considered interchangeable in an assembly if they have the same form, fit, and function. Interchangeability is the basic principle that drives modern manufacturing, contributing to several trillions of dollars of global trade per year. While the practice of interchangeable manufacture has been perfected over a century, the science of interchangeability has emerged only over the last two decades. It is based on models to define when two manufactured parts are geometrically equivalent. In this talk I will describe mathematical models used to ensure geometric composability, and how the models are validated for composability and the manufactured part instances are verified for conformance to the model specifications
Vijay Srinivasan is the chief of the Systems Integration Division in the Engineering Laboratory at the U.S. National Institute of Standards and Technology (NIST), Gaithersburg, Maryland. He comes to NIST from IBM, where he was the chief standards and solutions officer for Product Lifecycle Management (PLM); and program manager for PLM Research, Standards and Academic Programs at IBM. Before that, he was a manager in IBM's T.J. Watson Research Center leading research in the areas of geometric modeling, CAD/CAM, robotics, standards for geometric dimensioning and tolerancing, and data exchange. Dr. Srinivasan also served as an adjunct professor of mechanical engineering at Columbia University, where he has taught geometric modeling and computations and integrated product development. He is the current chairman of the US Technical Advisory Group to ISO/TC 213. Dr. Srinivasan is a founding member of the American Society of Mechanical Engineers (ASME) Y14.5.1 committee on mathematical definitions of GD&T, and is an ASME Fellow. He is also a Fellow of the American Association for the Advancement of Science (AAAS). His book, "Theory of Dimensioning: An introduction to parameterizing geometric models" was published by Marcel-Dekker in 2004. He also co-authored a book on �SOA Approach to Enterprise Integration for Product Lifecycle Management.