A critical study of the process necessary to create structural control models is made. Exact closed-form solutions of beams and truss-beams continuous models open and closed loop dynamics are given, and used to evaluate the low frequency accuracy of hand prefined finite element models. For trusses condensed models and refined joint behavior are considered, using the equivalent continuum approac...

Control forces in semi-active control systems are constrained by the dynamics of actuators that regulate energy transmission through variable damping and/or stiffness mechanisms. The potential benefit of the development and implementation of new semi-active control devices and applications can be determined by optimizing the controlled performance subject to the constraints of the dynamics of t...

A unique shape memory alloy (SMA) restrainer cable is developed and tested to evaluate its effectiveness in limiting the hinge opening in bridges. The SMA cables, connected at the deck–abutment interface, are tested on a four-span, one-quarter scale, concrete slab bridge. The bridge is subjected to a suite of ground motion to assess the performance of the SMAs under different magnitudes of load...

Organisms have to continuously adapt to changing environmental conditions or undergo developmental transitions. To meet the accompanying change in metabolic demands, the molecular mechanisms of adaptation involve concerted interactions which ultimately induce a modification of the metabolic state, which is characterized by reaction fluxes and metabolite concentrations. These state transitions a...

1Department of Civil Engineering, University of New Hampshire, Durham, NH 03824 2Department of Electrical Engineering, Princeton University, Princeton, NJ 08544 3Sonny Astani Department of Civil and Environmental Engineering, University of Southern California, Los Angeles, CA 90089 4Ming Hsieh Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089 Tat.Fu@...

The increasing size of modern wind turbines also increases the structural loads on the turbine caused by effects like turbulence or asymmetries in the inflowing wind field. Consequently, the use of advanced control algorithms for active load reduction has become a relevant part of current wind turbine control systems. In this paper, an H∞-norm optimal multivariable control design approach for a...