Analysis of the Effects of Soil on the Seismic Energy Responses of an Equipment‐Structure System via Substructure Shaking Table Testing

Luo, Lanfang; Jiang, Nan; Bi, Jia

doi:10.1155/2019/4351329

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…Günay and Mosalam [41] implemented a three-variable control (TVC) to an existing hybrid simulation system, which was adopted for RTHS of electrical disconnect switches on a shaking table configuration. Luo et al [42] conducted real-time substructure shaking table testing of an equipment-structure-soil system to study the effects of soil on the seismic energy responses of the equipment-structure subsystem. The branch modal substructure approach was employed to derive the formulas needed for the real-time substructure shaking table testing of the equipment-structure-soil system.…”

Section: Background and Motivationmentioning

confidence: 99%

Shaking Table Substructure Testing Based on Three-Variable Control Method with Velocity Positive Feedback

Wang

Bao

et al. 2020

Applied Sciences

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To improve the experimental accuracy and stability of shaking table substructure testing (STST), an explicit central difference method (CDM) and a three-variable control method (TVCM) with velocity positive feedback (VPF) are proposed in this study. First, the explicit CDM is presented for obtaining an improved control accuracy of the boundary conditions between the numerical and experimental substructures of STST. Compared with the traditional CDM, the proposed method can provide explicit control targets for displacement, velocity, and acceleration. Furthermore, a TVCM-VPF is proposed to improve the control stability and accuracy for loading the explicit control targets of displacement, velocity, and acceleration. The effectiveness of the proposed methods is validated by experiments on a three-story frame structure with a tuned liquid damper loaded on an old shaking table originally designed with the traditional displacement control mode. The experimental results show that the proposed explicit CDM works well, and the response rate and control accuracy of the shaking table are significantly improved with the contribution of the TVCM-VPF compared with those of the traditional proportional integral derivative (PID) controller. This indicates the advantage of the proposed TVCM-VPF over the traditional PID for STST. A comparison between the traditional shaking table test and STST shows that when the latter is based on the TVCM-VPF, it exhibits an excellent performance in terms of the stability and accuracy of displacement and an acceptable performance in terms of the acceleration accuracy.

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Section: Background and Motivationmentioning

confidence: 99%

Shaking Table Substructure Testing Based on Three-Variable Control Method with Velocity Positive Feedback

Wang

Bao

et al. 2020

Applied Sciences

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“…UHV electrical equipment is substantially larger than the high-voltage (HV) one and has different structural features. Substantial efforts have been given to the seismic performance of electrical equipment based on numerical simulation and laboratory experiments [10][11][12][13][14]. However, most of them are still mainly focusing on the individual equipment itself, and very little attention has been payed to the seismic reliability of the whole system.…”

Section: Introductionmentioning

confidence: 99%

Study on Seismic Reliability of UHVDC Transmission Systems

Yao

Jia

2019

Shock and Vibration

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Electric power system is critical to maintain the welfare of the general public with impact on economic losses and other cascading. In this paper, the seismic reliability of the ultra-high-voltage direct current (UHVDC) transmission system was evaluated from a perspective of the subsystem fault logic. An assessment model of system seismic reliability was proposed based on the state enumeration method. A case study was presented by taking a typical 800 kV UHVDC transmission system as the example. The finite element models of major components in the UHVDC transmission system were established to evaluate their seismic reliability. The results reveal that though the seismic reliability of major components seems satisfactory overall, the UHVDC transmission system may still suffer from seismic hazards to a certain degree due to the complexity of the full system. This calls for a further enhancement in seismic design requirements of the electrical equipment.

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Dynamic Force Loading Strategy for Effective Force Testing Considering Natural Velocity Feedback Compensation and Nonlinearity

Wang

Ding

Shi

et al. 2020

Int. J. Str. Stab. Dyn.

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The effective force testing is a promising seismic testing method for evaluating the structural dynamic response to earthquakes for conciseness and efficiency. However, two challenging loading issues are associated with this method, i.e. the natural velocity feedback (NVF) and nonlinearities related to the interaction between the loading system and specimen, thereby hindering its development and extensive applications. To address these issues, this study proposes a dynamic force loading strategy using a hybrid algorithm with linear compensation for NVF and model reference adaptive control via the minimal control synthesis (MCS) method. Online identification of linear compensation gain in preliminary tests is conceived based on the gradient descent method. A series of numerical simulations on a nonlinear loading system model with linear/trilinear single/two degree(s)-of-freedom specimens are conducted using five loading strategies, including linear and nonlinear compensations and MCS method. Comparative studies show that the proposed method and nonlinear compensation strategy outperform the other three methods, and sometimes the proposed method performs best. In summary, the proposed method is promising because of its accuracy and robustness as well as its ease of implementation and cost-effectiveness.

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Analysis of the Effects of Soil on the Seismic Energy Responses of an Equipment‐Structure System via Substructure Shaking Table Testing

Cited by 3 publications

References 17 publications

Shaking Table Substructure Testing Based on Three-Variable Control Method with Velocity Positive Feedback

Shaking Table Substructure Testing Based on Three-Variable Control Method with Velocity Positive Feedback

Study on Seismic Reliability of UHVDC Transmission Systems

Dynamic Force Loading Strategy for Effective Force Testing Considering Natural Velocity Feedback Compensation and Nonlinearity

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