Simulation of Wind Tunnel Forces Using Magnetic Suspension Technology

Forces experienced by metal roofs under high wind conditions vary as a function of both time and space. Modeling a roof structure subdivided into segments or nodes accommodates spatial variation, for which magnetic suspended actuators are made to generate time-tailored forces equivalent to the wind-induced forces. In this study, each node consists of an induced electromagnetic actuator, an electronic control board, and a load cell for verification of the force produced. Short duration wind gust and the effect of such impulsive loading on a metal roof panel and the overall structural system are poorly incorporated in the present state-of-the-art in structural analysis and design. A full-scale testing facility for metal building roof components, now in operation at Mississippi State University, provides realistic forces that approximate those produced by high velocity winds from wind tunnel models.