Robust real-time substructuring techniques for under-damped systems

Gawthrop, P.J.; Wallace, Mark I.; Neild, Simon A; Wagg, DJ

doi:10.1002/stc.174

Cited by 33 publications

(32 citation statements)

References 16 publications

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“…As discussed previously (Gawthrop et al, 2006), we believe that the transfer system transfer function T (s) should comprise well-designed hardware and control algorithms, so Assumption 3 is reasonable. Following the notation of Gawthrop et al (2006), the transfer system is represented by the stable transfer function…”

Section: Assumption 3 T (S) Is a Stable Transfer Functionmentioning

confidence: 95%

“…The effect of transfer system dynamics can be mitigated by reformulating the problem as a feedback control problem, so that the techniques of robust control design can be applied to ensure stability (Gawthrop et al, 2006), but at the cost of reduced accuracy. In a small number of cases, the dynamics of the transfer system can be removed from the closed loop by using an inverted model of the transfer system dynamics -for example, using the virtual actuator approach (Gawthrop, 2004(Gawthrop, , 2005Gawthrop et al, 2005b) -in most cases however, the transfer system is not (causally) invertible.…”

Section: +44 (117) 929 4423mentioning

confidence: 99%

“…Following the notation of Gawthrop et al (2006), the transfer system is represented by the stable transfer function…”

Section: Assumption 3 T (S) Is a Stable Transfer Functionmentioning

confidence: 99%

“…This small phase margin gives rise to the extreme sensitivity problem discussed elsewhere (Gawthrop et al, 2005b(Gawthrop et al, , 2006Wallace et al, 2005b); in particular, a small value of c together with neglected dynamics in the transfer system results in…”

Section: Control Engineering Practice 16 (2008) 897-908mentioning

confidence: 99%

“…As discussed by Gawthrop et al (2006), robust stability can be obtained at the expense of fidelity by appropriate control design. However, the main thrust of this paper is to remove the transfer system as accurately as possible thus giving accurate fidelity despite the small phase margin.…”

Section: Control Engineering Practice 16 (2008) 897-908mentioning

confidence: 99%

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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: Assumption 3 T (S) Is a Stable Transfer Functionmentioning

confidence: 95%

Section: +44 (117) 929 4423mentioning

confidence: 99%

“…Following the notation of Gawthrop et al (2006), the transfer system is represented by the stable transfer function…”

Section: Assumption 3 T (S) Is a Stable Transfer Functionmentioning

confidence: 99%

Section: Control Engineering Practice 16 (2008) 897-908mentioning

confidence: 99%

Section: Control Engineering Practice 16 (2008) 897-908mentioning

confidence: 99%

See 3 more Smart Citations

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

Gawthrop¹,

Virden²,

Neild³

et al. 2008

Control Engineering Practice

Self Cite

View full text Add to dashboard Cite

show abstract

A simple strategy for dynamic substructuring: I. Concept and development

Stefanaki

Sivaselvan

2018

Earthq Engng Struct Dyn

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Summary Dynamic substructuring refers to physical testing with computational models in the loop. This paper presents a new strategy for such testing. The key feature of this strategy is that it decouples the substructuring controller from the physical subsystem. Unlike conventional approaches, it does not explicitly include a tracking controller. Consequently, the design and implementation of the substructuring controls are greatly simplified. This paper motivates the strategy and discusses the main concept along with details of the substructuring control design. The focus is on configurations that use shake tables and active mass drivers. An extensive experimental assessment of the new strategy is presented in a companion paper, where the influence of various factors such as virtual subsystem dynamics, control gains, and nonlinearities is investigated, and it is shown that robustly stable and accurate substructuring is achieved.

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Development of numerical-substructure-based and output-based substructuring controllers

2012

Struct. Control Health Monit.

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Substructured and analytical frameworks for the development of numerical-substructure-based and output-based substructuring controllers are proposed. The principle of numerical-substructure-based control systems utilises online parameters and signals related to numerical substructures for the control gain synthesis. Output-based controllers consider only online information related to transfer systems. The resulting linear feedforward and feedback controllers are synthesised using state-space and transfer-function techniques, assuming that the dynamics of tested specimens are to be completely unknown, and thus can cope with nonlinear substructuring tasks. Selection of the controllers for implementation depends on the synchronisation requirement and the dynamic properties of the controllers in real-time conditions. Experimental results of a two-mass-spring system verifying the controller designs are presented, which also show that the addition of feedback controllers can effectively reduce the synchronised errors.Accordingly, compared with (3) and (7), the procedure to obtain x e (s) in (16) is simplified and is independent of the Σ 2 parameters, resulting in a concise representation for x e (s).

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Robust real-time substructuring techniques for under-damped systems

Cited by 33 publications

References 16 publications

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

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

A simple strategy for dynamic substructuring: I. Concept and development

Development of numerical-substructure-based and output-based substructuring controllers

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