Development and Simulation of a Real-Time Dynamic Testing Procedure for Structures

Williams, M; Blakeborough, A; D, Clement; Darby, Antony; Williams, Douglas E.; Woodward, Neil

doi:10.4203/ccp.59.6.1

Cited by 1 publication

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“…However, for these methods, which compensate for inadequacies of the control routine of the actuator by forward-predicting the displacement demand input to the controller, it was necessary to approximate this lag to a delay. This concept was extended to allow the length of the delay to be adapted during the test [4,5].…”

Section: Introductionmentioning

confidence: 99%

Control issues relating to real-time substructuring experiments using a shaking table

Neild

Stoten

Drury

et al. 2005

Earthquake Engng Struct. Dyn.

115

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SUMMARYReal-time substructuring is a method of dynamically testing a structure without experimentally testing a physical model of the entire system. Instead the structure can be split into two linked parts, the region of particular interest, which is tested experimentally, and the remainder which is tested numerically. A transfer system, such as a hydraulic actuator or a shaking table, is used to impose the displacements at the interface between the two parts on the experimental substructure. The corresponding force imposed by the substructure on the transfer system is fed back to the numerical model. Control of the transfer system is critical to the accuracy of the substructuring process. A study of two controllers used in conjunction with the University of Bristol shaking table is presented here. A proof-of-concept one degree-of-freedom mass-spring-damper system is substructured such that a portion of the mass forms the experimental substructure and the remainder of the mass plus the spring and the damper is modelled numerically. Firstly a linear controller is designed and tested. Following this an adaptive substructuring strategy is considered, based on the minimal control synthesis algorithm. The deleterious e ect of oilcolumn resonance common to shaking tables is examined and reduced through the use of ÿlters. The controlled response of the experimental specimen is compared for the two control strategies.

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Section: Introductionmentioning

confidence: 99%