Acceleration Tracking Performance of the UCSD-NEES Shake Table

Luco, J. Enrique; Özçelik, Özgür; Conte, Joseph Le

doi:10.1061/(asce)st.1943-541x.0000137

Cited by 52 publications

(38 citation statements)

References 5 publications

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“…Some, but not all, shake table tests additionally require high accuracy in the time domain. Luco et al 6 describe the performance of a large-scale shake table under sinusoidal, earthquake, and white noise motions using metrics of command versus achieved peak acceleration, 3%-damped response spectra, and root-mean-square error of the command versus achieved acceleration time series. Such a balanced approach, considering several different motion types and performance metrics, is attractive from a practical standpoint because it allows broad assessment of of likely interest in future test campaigns.…”

Section: Previous Investigations Of Shake Table Performancementioning

confidence: 99%

“…For the current work, Arias intensity (I A ) was compared as a ratio of achieved versus target, I Aa /I At . Constant-ductility response spectra may also be considered for this purpose, 6 in which case evaluation criteria similar to Equations 2 and 3 may be used.…”

Section: Performance Metrics and Acceptance Criteriamentioning

confidence: 99%

“…The evaluations were made on the basis of 5% damping, although 3% has been used in previous investigations. 6 The maximum spectral acceleration ratio (or error) is defined as:…”

Section: Performance Metrics and Acceptance Criteriamentioning

confidence: 99%

“…Typically, predictions of table performance constitute part of their initial design, and performance is usually evaluated during commissioning (eg, [4][5][6][7]8 ). Only a few studies have investigated performance characteristics before and after a retrofit action, such as changing the control system from analog to digital (eg, 9 ).…”

Section: Previous Investigations Of Shake Table Performancementioning

confidence: 99%

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An approach for shake table performance evaluation during repair and retrofit actions

Trautner

Zheng

McCartney

et al. 2017

Earthq Engng Struct Dyn

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SummaryLarge-scale, servo-hydraulic shake tables are a central fixture of many earthquake engineering and structural dynamics laboratories. Wear and component failure from frequent use may lead to control problems resulting in reduced motion fidelity, necessitating repairs and replacement of major components. This paper presents a methodology to evaluate shake table performance preand post-repair, including the definition of important performance metrics.The strategy suggested is presented in the context of the rebuilding of a 4.9 × 3.1 m, 350-kN-capacity uniaxial shake table. In this case, the rebuild consisted of characterization of wear to table components, replacement of worn bearing surfaces, and replacement of hydraulic accumulators. To assess the effectiveness of the repair actions, sinusoidal and triangular waves, white noise, and earthquake histories were run on the table before and after the rebuild. The repair actions were successful in reducing the position and velocity dependence of friction, improving the ability of control algorithms to accurately reproduce earthquake motions. The maximum and average response spectral misfits in the period range of 0.1-2 seconds were reduced from approximately 50% to 15%, and from 5% to less than 2.5%, respectively.

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Section: Previous Investigations Of Shake Table Performancementioning

confidence: 99%

Section: Performance Metrics and Acceptance Criteriamentioning

confidence: 99%

“…The evaluations were made on the basis of 5% damping, although 3% has been used in previous investigations. 6 The maximum spectral acceleration ratio (or error) is defined as:…”

Section: Performance Metrics and Acceptance Criteriamentioning

confidence: 99%

Section: Previous Investigations Of Shake Table Performancementioning

confidence: 99%

See 2 more Smart Citations

An approach for shake table performance evaluation during repair and retrofit actions

Trautner

Zheng

McCartney

et al. 2017

Earthq Engng Struct Dyn

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show abstract

“…The earliest methods use conventional linear controller, such as closed-loop PID, deltaP and feed-forward control algorithm [4,5], and three variable control (TVC) [6,7]. However, due to the complexity of the problem the need for more sophisticated control systems become necessary.…”

Section: Introductionmentioning

confidence: 99%

Performance of the CGS six DOF Shaking Table on the Harmonic Signal Reproduction

Halim

Airouche

Hassan

et al. 2017

Period. Polytech. Civil Eng.

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IntroductionShaking tables are being increasingly used in earthquake engineering research field and remain one of the preferred tools for seismic testing [1]. Their main objective is to replicate a wide range of a desired motion with a high degree of accuracy, in order to generate meaningful and reliable results. However, despite the significant progress achieved in shake table design and control technology during the last decades, number of challenges still exist [2]. These challenges fall into two categories: (i) economical and practical challenges and (ii) technical challenges. In the first category we can cite the problem of the full-scale realistic tests of large structural systems which are constrained by the limited financial resources and capacities of the existing laboratories. The second category includes control issues, consideration of different loading conditions other than dynamic base motion and soil-structure interaction effects in shaking-table testing.Undoubtedly, the control of shaking table is the key element of the whole system and one of the most difficult technical challenges. In fact, the modern multiple degree-of-freedom shaking table with a resonating and eccentric specimen has the characteristics of a strongly coupled multiple input, multiple output dynamic system [3]. In such a system, servovalves characteristics, oil column resonance, frictions in the system, cross coupling between degrees of freedom, specimen compliance and noise in feedback transducers, are some of the predominant sources of nonlinearities that can adversely affect the accurate control, stability and high fidelity signal reproduction, of the shaking table.Various control techniques have been developed in order to provide a shaking table with optimum performance and high level of motion control. The earliest methods use conventional linear controller, such as closed-loop PID, deltaP and feed-forward control algorithm [4,5], and three variable control (TVC) [6,7]. However, due to the complexity of the problem the need for more sophisticated control systems become necessary. With advances in computing technologies, followed by the breakthrough development of the digital signal processing and realtime operations, methods based on hybrid control strategies

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Model testing using shake tables – current practice

Kasalanati¹

2020

Physical Models

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Acceleration Tracking Performance of the UCSD-NEES Shake Table

Cited by 52 publications

References 5 publications

An approach for shake table performance evaluation during repair and retrofit actions

An approach for shake table performance evaluation during repair and retrofit actions

Performance of the CGS six DOF Shaking Table on the Harmonic Signal Reproduction

Model testing using shake tables – current practice

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