Effects of interface delay in real-time dynamic substructuring tests on a cable for cable-stayed bridge
Marsico, M
Date: 1 December 2014
Journal
Smart Structures and Systems
Publisher
Techno Press
Publisher DOI
Abstract
Real-time dynamic substructuring tests have been conducted on a cable-deck system. The cable is
representative of a full scale cable for a cable-stayed bridge and it interacts with a deck, numerically
modelled as a single-degree-of-freedom system. The purpose of exciting the inclined cable at the bottom is
to identify its nonlinear ...
Real-time dynamic substructuring tests have been conducted on a cable-deck system. The cable is
representative of a full scale cable for a cable-stayed bridge and it interacts with a deck, numerically
modelled as a single-degree-of-freedom system. The purpose of exciting the inclined cable at the bottom is
to identify its nonlinear dynamics and to mark the stability boundary of the semi-trivial solution. The latter
physically corresponds to the point at which the cable starts to have an out-of-plane response when both
input and previous response were in-plane. The numerical and the physical parts of the system interact
through a transfer system, which is an actuator, and the input signal generated by the numerical model is
assumed to interact instantaneously with the system. However, only an ideal system manifests a perfect
correspondence between the desired signal and the applied signal. In fact, the transfer system introduces into
the desired input signal a delay, which considerably affects the feedback force that, in turn, is processed to
generate a new input. The effectiveness of the control algorithm is measured by using the synchronization
technique, while the online adaptive forward prediction algorithm is used to compensate for the delay error,
which is present in the performed tests. The response of the cable interacting with the deck has been
experimentally observed, both in the presence of delay and when delay is compensated for, and it has been
compared with the analytical model. The effects of the interface delay in real-time dynamic substructuring
tests conducted on the cable-deck system are extensively discussed.
Engineering
Faculty of Environment, Science and Economy
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