AI-Based VR Earthquake Simulator

Physical and Numerical Simulations of the Seismic Response of a 1,100 kV Power Transformer Bushing

Earthquake Spectra ◽

10.1193/090417eqs172m ◽

2018 ◽

Vol 34 (3) ◽

pp. 1515-1541 ◽

Cited By ~ 7

Author(s):

Guo-Liang Ma ◽

Qiang Xie ◽

Andrew S. Whittaker

Keyword(s):

Finite Element ◽

Finite Element Model ◽

Numerical Simulations ◽

Seismic Vulnerability ◽

Power Transformer ◽

Element Model ◽

Ground Shaking ◽

Earthquake Simulator ◽

Physical Experiments ◽

Seismic Tests

Power transformers and bushings are key pieces of substation equipment and are vulnerable to the effects of earthquake shaking. The seismic performance of a 1,100 kV bushing, used in an ultra-high voltage (UHV) power transformer, is studied using a combination of physical and numerical experiments. The physical experiments utilized an earthquake simulator and included system identification and seismic tests. Modal frequencies and shapes are derived from white noise tests. Acceleration, strain, and displacement responses are obtained from the uniaxial horizontal seismic tests. A finite element model of the 1,100 kV bushing is developed and analyzed, and predicted and measured results are compared. There is reasonably good agreement between predicted and measured responses, enabling the finite element model to be used with confidence for seismic vulnerability studies of transformer-bushing systems. A coupling of the experimental and numerical simulations enabled the vertically installed UHV bushing to be seismically qualified for three-component ground shaking with a horizontal zero-period acceleration of 0.53 g.

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Design and development of a fuzzy-PLC for an earthquake simulator/shake table

2014 International Conference on Humanoid, Nanotechnology, Information Technology, Communication and Control, Environment and Management (HNICEM) ◽

10.1109/hnicem.2014.7016221 ◽

2014 ◽

Cited By ~ 6

Author(s):

Renann G. Baldovino ◽

Elmer P. Dadios

Keyword(s):

Shake Table ◽

Design And Development ◽

Earthquake Simulator

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Earthquake Simulator

10.1109/ccac51819.2021.9633272 ◽

2021 ◽

Author(s):

Andras Guzman ◽

Cristian Leon ◽

Jose Vuelvas ◽

Martha Manrique

Keyword(s):

Earthquake Simulator

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EQsimu: a 3-D finite element dynamic earthquake simulator for multicycle dynamics of geometrically complex faults governed by rate- and state-dependent friction

Geophysical Journal International ◽

10.1093/gji/ggz475 ◽

2019 ◽

Vol 220 (1) ◽

pp. 598-609 ◽

Cited By ~ 1

Author(s):

Dunyu Liu ◽

Benchun Duan ◽

Bin Luo

Keyword(s):

Finite Element ◽

Message Passing Interface ◽

Fault System ◽

Second Phase ◽

Finite Element Code ◽

Earthquake Cycle ◽

Hexahedral Elements ◽

Earthquake Simulator ◽

State Dependent ◽

Geometrically Complex

SUMMARY We develop a finite element dynamic earthquake simulator, EQsimu, to model multicycle dynamics of 3-D geometrically complex faults. The fault is governed by rate- and state-dependent friction (RSF). EQsimu integrates an existing finite element code EQdyna for the coseismic dynamic rupture phase and a newly developed finite element code EQquasi for the quasi-static phases of an earthquake cycle, including nucleation, post-seismic and interseismic processes. Both finite element codes are parallelized through Message Passing Interface to improve computational efficiency and capability. EQdyna and EQquasi are coupled through on-fault physical quantities of shear and normal stresses, slip-rates and state variables in RSF. The two-code scheme shows advantages in reconciling the computational challenges from different phases of an earthquake cycle, which include (1) handling time-steps ranging from hundredths of a second to a fraction of a year based on a variable time-stepping scheme, (2) using element size small enough to resolve the cohesive zone at rupture fronts of dynamic ruptures and (3) solving the system of equations built up by millions of hexahedral elements. EQsimu is used to model multicycle dynamics of a 3-D strike-slip fault with a bend. Complex earthquake event patterns spontaneously emerge in the simulation, and the fault demonstrates two phases in its evolution. In the first phase, there are three types of dynamic ruptures: ruptures breaking the whole fault from left to right, ruptures being halted by the bend, and ruptures breaking the whole fault from right to left. As the fault bend experiences more ruptures, the zone of stress heterogeneity near the bend widens and the earthquake sequence enters the second phase showing only repeated ruptures that break the whole fault from left to right. The two-phase behaviours of this bent fault system suggest that a 10° bend may conditionally stop dynamic ruptures at the early stage of a fault system evolution and will eventually not be able to stop ruptures as the fault system evolves. The nucleation patches are close to the velocity strengthening region. Their sizes on the two fault segments are different due to different levels of the normal stress.

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