A new method for compensating actuator delay in real–time hybrid experiments

Horiuchi, Toshiaki; Konno, Takao

doi:10.1098/rsta.2001.0878

Cited by 134 publications

(97 citation statements)

References 14 publications

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“…One of the most commonly considered examples of a noninvertible transfer system is that of a pure time delay. A number of approaches have been suggested to compensate for a pure delay including polynomial extrapolation (Darby et al, 2002;Horiuchi & Konno, 2001;Wallace et al, 2005a,b), adaptive forward prediction (Darby et al, 2002;Wallace et al, 2005b,b) and Smith's predictor (Agrawal & Yang, 2000;McGreevy et al, 1998;Reinhorn et al, 2004).…”

Section: +44 (117) 929 4423mentioning

confidence: 99%

Emulator-based control for actuator-based hardware-in-the-loop testing

Gawthrop¹,

Virden²,

Neild³

et al. 2008

Control Engineering Practice

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Hardware-in-the-loop (HWiL) is a form of component testing where hardware components a linked with software models. In order to test mechanical components an additional transfer system is required to link the software and hardware subsystems. The transfer system typically comprises of sensors and actuators and the dynamic effects of these components need to be eliminated to give accurate results. In this paper an emulator-based control strategy is presented for actuator based HWiL. Emulator-based control can solve the twin problems of stability and fidelity caused by the unwanted transfer system (actuator) dynamics.Significantly EBC can emulate the inverse of a transfer system which is not causally invertible, allowing a wider range of more complex transfer systems to be controlled. A robustness analysis is given and experimental results presented.

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Section: +44 (117) 929 4423mentioning

confidence: 99%

Emulator-based control for actuator-based hardware-in-the-loop testing

Gawthrop¹,

Virden²,

Neild³

et al. 2008

Control Engineering Practice

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show abstract

“…Such a hybrid testing method could help to reduce the overall cost of the experiment and at the same time offer the possibility of observing full scale dynamics. One such approach is real-time dynamic substructuring (see, for instance, Blakeborough et al 2001;Bonelli & Bursi 2004;Horiuchi & Konno 2001;Nakashima 2001;Pinto et al 2004;Wallace et al 2004;. This method consists of dividing the test structure into two parts.…”

Section: Introductionmentioning

confidence: 99%

Real-time dynamic substructuring in a coupled oscillator–pendulum system

et al. 2006

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Real-time dynamic substructuring is a powerful testing method, which brings together analytical, numerical and experimental tools for the study of complex structures. It consists of replacing one part of the structure with a numerical model, which is connected to the remainder of the physical structure (the substructure) by a transfer system. In order to provide reliable results, this hybrid system must remain stable during the whole test. A primary mechanism for destabilization of these type of systems is the delays which are naturally present in the transfer system. In this paper, we apply the dynamic substructuring technique to a nonlinear system consisting of a pendulum attached to a mechanical oscillator. The oscillator is modelled numerically and the transfer system is an actuator. The system dynamics is governed by two coupled second-order neutral delay differential equations. We carry out local and global stability analyses of the system and identify the delay dependent stability boundaries for this type of system. We then perform a series of hybrid experimental tests for a pendulum–oscillator system. The results give excellent qualitative and quantitative agreement when compared to the analytical stability results.

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“…Horiuchi and Konno, [97] proposed a compensation scheme that predicts the acceleration based on the assumption that acceleration varies linearly. The predicted acceleration is then used to calculate the target displacement.…”

Section: Figure 5 Schematic Of the Prediction Methods For Actuator Dementioning

confidence: 99%

An overview of seismic hybrid testing of engineering structures

McCrum¹,

Williams

2016

Engineering Structures

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An overview of research on the development of the hybrid test method is presented. The maturity of the hybrid test method is mapped in order to provide context to individual research in the overall development of the test method. In the pseudo dynamic (PsD) test method, the equations of motion are solved using a time stepping numerical integration technique with the inertia and damping being numerically modelled whilst restoring force is physically measured over an extended timescale. Developments in continuous PsD testing led to the real-time hybrid test method and geographically distributed hybrid tests. A key aspect to the efficiency of hybrid testing is the substructuring technique where the critical structural subassemblies that are fundamental to the overall response of the structure are physically tested whilst the remainder of the structure whose response can be more easily predicted is numerically modelled. Much of the early research focused on developing the accuracy and efficiency of the test method, whereas more recently the method has matured to a level where the test method is applied purely as a dynamic testing technique.Developments in numerical integration methods, substructuring, experimental error reduction, delay compensation and speed of testing have led to a test method now in use as full-scale real-time dynamic testing method that is reliable, accurate, efficient and cost effective.

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A new method for compensating actuator delay in real–time hybrid experiments

Cited by 134 publications

References 14 publications

Emulator-based control for actuator-based hardware-in-the-loop testing

Emulator-based control for actuator-based hardware-in-the-loop testing

Real-time dynamic substructuring in a coupled oscillator–pendulum system

An overview of seismic hybrid testing of engineering structures

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