Structural Dynamics and the Seismic Response Control Laboratory
Room 122, Hudson Engineering Center
Department of Civil and Environmental Engineering
Edmund T. Pratt School of Engineering
Duke University - Box 90287, Durham, NC 27708-0287

Henri Gavin, Ph.D., P.E., Associate Professor

Laboratory Facilities

Duke's structural dynamics laboratory features a wide array of sensors, actuators, and data acquisition systems for precise dynamic loading and response measurement of structural systems. The central facility is a single-axis, servo-hydrualic shaking table (50~kN, 50~cm/s, 0-60 Hz, 15~cm stroke, 5 ton payload). For smaller structures we use electro-dynamic actuators (0.2~kN, 500~cm/s, 2-500~Hz, 1~cm stroke). A wide range of accelerometers (piezo-electric, MEMS, and force balance) enable measurements spanning micro-g to 10 g. Our inductive velocity sensors can measure velocites with displacements rangeing from 2~cm to 18~cm and have kHz bandwidth. Our DC-DC LVDT's measure displacments with spans from 2~cm to 10~cm and have a 100~Hz bandwidth. For load measurement, our fatigue-rated load cells have ranges from 0.2~kN to 22~kN. For custom applications, we manufacture strain-gage based load and displacement sensors. Signal conditioning is acomplished through dedicated instrumentation amplifiers and 16-channels of programmable anti-alias filters prior to digitization (16~bit to 22~bit) at sample rates up to 100~kHz. For on-line, real-time processing we use a SigLab 20-42. For real-time control we have have developed custom software and also use Matlab/Simulink with Quanser hardware.

SD-SRCL Shaking Table Properties:

Seismic isolation experiments on the SD-SRCL shaking table.

Shaking table - front view Shaking table - in action

MR damper: disassembled and during test

Lab Tour, November 10, 2001.

Controllable hydraulic valve device

Electro-magnetic Actuation for Small Scale Models

Experimental Dynamics for Nonlinear and Chaotic Systems
Collaborative project with Professor Lawrence Virgin,
author of Introduction to Experimental Nonlinear Dynamics.

© 2000-2001 Henri P. Gavin; Last Updated: September 2, 2000