Adaptive Response Mechanism Based on the Hybrid Simulation and Optimization for the Real Time Event Management

2011 ◽  
Vol 2 (2) ◽  
pp. 69-76
Author(s):  
Suk Jae Jeong ◽  
Suk Jun Lee
Keyword(s):  
Real Time ◽  
Adaptive Response ◽  
Hybrid Simulation ◽  
Event Management ◽  
Response Mechanism ◽  
The Real ◽  
Simulation And Optimization

Computational Challenges in Real-Time Hybrid Simulation of Tall Buildings under Multiple Natural Hazards

2018 ◽  
Vol 763 ◽  
pp. 566-575 ◽  
Author(s):  
Chinmoy Kolay ◽  
James M. Ricles ◽  
Thomas M. Marullo ◽  
Safwan Al-Subaihawi ◽  
Spencer E. Quiel
Keyword(s):  
Real Time ◽  
Natural Hazards ◽  
Hybrid Simulation ◽  
Tall Buildings ◽  
Earthquake Hazard ◽  
Performance Based Design ◽  
The Real ◽  
Large Systems ◽  
Wind Events ◽  
Energy Dissipation Devices

The essence of real-time hybrid simulation (RTHS) is its ability to combine the benefits ofphysical testing with those of computational simulations. Therefore, an understanding of the real-timecomputational issues and challenges is important, especially for RTHS of large systems, in advancingthe state of the art. To this end, RTHS of a 40-story (plus 4 basement stories) tall building havingnonlinear energy dissipation devices for mitigation of multiple natural hazards, including earthquakeand wind events, were conducted at the NHERI Lehigh Experimental Facility. An efficient implementationprocedure of the recently proposed explicit modified KR-a (MKR-a) method was developedfor performing the RTHS. This paper discusses this implementation procedure and the real-time computationalissues and challenges with regard to this implementation procedure. Some results from theRTHS involving earthquake loading are presented to highlight the need for and application of RTHSin performance based design of tall buildings under earthquake hazard.

Real-Time Hybrid Simulation of Viscous Dampers for Seismic Hazard Mitigation

2014 ◽  
Author(s):  
Cheng Chen ◽  
Jose Valdovinos ◽  
Wenshen Pong
Keyword(s):  
Viscous Fluid ◽  
Seismic Hazard ◽  
Real Time ◽  
Hazard Mitigation ◽  
Critical Role ◽  
Hybrid Simulation ◽  
The Real ◽  
Seismic Hazard Mitigation ◽  
Fluid Damper ◽  
Viscous Fluid Damper

Laboratory experiments play a critical role in earthquake engineering research for seismic safety evaluation of civil engineering structures. Real-time hybrid simulation provides a viable alternative for shake table testing to evaluate seismic performances of structures with rate-dependent seismic devices. Servo-hydraulic actuators play a vital role in a real-time hybrid simulation to maintain the boundary condition between the analytical and experimental substructures. Compensation of actuator delay is critical to minimize synchronization error from actuator delay and to achieve a successful real-time hybrid simulation. Research on how actuator delay can affect the real-time hybrid simulation involving viscous fluid damper is presented in this study. It is demonstrated that although the viscous fluid damper can help stabilize the real-time hybrid simulation with actuator delay, the experimental results need to be interpreted appropriately to evaluate the performance of viscous fluid damper for seismic hazard mitigation.

Improving model-based compensation method for real-time hybrid simulation considering error of identified model

2020 ◽  
pp. 107754632096162
Author(s):  
Zihao Zhou ◽  
Ning Li
Keyword(s):  
Time Delay ◽  
Transfer Function ◽  
Real Time ◽  
Hybrid Simulation ◽  
Compensation Method ◽  
Test Results ◽  
Two Stage ◽  
The Real ◽  
Model Based ◽  
Real Plant

Time delay is a critical and unavoidable problem in real-time hybrid simulation. An accurate and effective compensation method for time delay is necessary for the safety of real-time hybrid simulation and the reliability of test results. Generally, a model-based compensation method can be adopted, which is derived from the identified transfer function by assuming the latter can accurately represent the real plant. However, there must be some differences between the transfer function and the real plant. To facilitate the development of real-time hybrid simulation, we proposed a two-stage feedforward compensation method considering the error between the transfer function identified and the real plant. The compensation strategy proposed in this study was not only based on the transfer function but also introduced an error model as a second-stage compensation into a compensator to realize the synchronization of command and measurement. To verify the efficiency of the proposed method, comparisons in time domain and frequency domain with the feedforward compensator in a model-based feedforward–feedback control method were carried out. Compared with the feedforward compensator, the two-stage method achieved better tracking performance, especially in the high-frequency bandwidth. The test results verified that for a band-limited white noise of 0–30 Hz, the phase lag of the actuation system can be limited to ±5°. Finally, the two-stage method was applied to a real-time hybrid simulation of a two-story frame to illustrate its compensation effect on time delay.

scholarly journals SIMULATION OF AUTOMATED REAL‐TIME GROSS INTERBANK SETTLEMENT

2009 ◽  
Vol 15 (1) ◽  
pp. 123-135
Author(s):  
Donatas Bakšys ◽  
Leonidas Sakalauskas
Keyword(s):  
Real Time ◽  
Real Data ◽  
Transfer System ◽  
The Real ◽  
Settlement Systems ◽  
Simulation And Optimization ◽  
Modelling Simulation

The aim of this paper is to analyze algorithms for the automated real‐time gross inter‐bank settlement (RTGS). One can change the efficiency of settlement systems by perfecting the processing of settlements and/or implementing rules for solving the gridlocks, or by applying the tools of refinancing and reservation. We focus on the settlement simulation of the Trans‐European Automated Real‐time Gross Settlement Express Transfer system (TARGET2). The system of modelling, simulation, and optimization of settlements (Bakšys and Sakalauskas 2007b) is applied in the simulation of TARGET2, estimating the parameters of simulation according to the real data. Santrauka Tarpbankinių mokėjimų apimties didėjimas, augantis poreikis atlikti mokėjimus realaus laiko režimu kelia papildomų reikalavimų tarpbankinių atsiskaitymų sistemų technologijoms. Aktyvus elektroninių informacijos perdavimo priemonių diegimas į bankininkystę ir dideles atsiskaitymų dalies sutelkimas tam tikruose bankų sistemos centruose leido sukurti automatizuotus atsiskaitymo centrus ‐ tarpbankinių lėšų pervedimo ir priešpriešinių mokėjimų padengimo sistemos. Straipsnio tyrimo objektas ‐ transnacionalinių automatizuotų tarpbankinių atsiskaitymų algoritmų analizė imituojant atsiskaitymų procesą. Tyrimų metu buvo nagrinėjami transeuropinės automatizuotos realaus laiko atskirųjų atsiskaitymų skubių pervedimu sistemos (TARGET2) atsiskaitymų algoritmai. Atsiskaitymų procesui imituoti buvo naudojama atsiskaitymų modeliavimo, imitavimo ir optimizavimo sistema. Algoritmu tyrimo rezultatai gauti remiantis realiais mokėjimų ir atsiskaitymo sistemos duomenimis.

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