Offline Iterative Hybrid Test for Seismic Isolation Structures
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Solution Overview
Problem
Existing real-time hybrid test methods for seismic isolation structures face challenges due to high requirements for real-time computation and communication, which are difficult to meet with conventional equipment and platforms, especially for large and complex structures.
Innovation Solution
An offline iterative real-time hybrid test method and system that loads a driving displacement time history signal onto an experiment substructure, records the restoring force time history feedback, and iteratively corrects the signals using a model identification algorithm to achieve convergence without real-time data interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If real-time hybrid test is used for seismic isolation structures, then real-time loading and communication are achieved, but high requirements are imposed on communication platform and loading equipment
Solution Approach 1:
The patent divides the seismic isolation structure into experiment substructure and numerical substructure, separating the physical testing from the computational modeling. This segmentation allows the experiment substructure to be loaded in real-time while the numerical substructure handles the complex computations independently, reducing the burden on communication platforms and loading equipment.
Solution Approach 2:
The patent performs preliminary actions by extracting the driving displacement time history signal from the seismic isolation structure before the actual testing. The signal is pre-processed and prepared in advance, allowing the experiment substructure to be loaded with ready-to-use data without requiring real-time computation during the test, thus reducing real-time communication requirements.
2Measurement precision
If real-time hybrid test is used for large and complex structures, then accurate seismic performance simulation is achieved, but real-time computation and communication requirements become excessive
Solution Approach 1:
The patent segments the structure into experiment and numerical substructures, allowing the numerical substructure to perform computationally intensive analyses offline without impacting real-time testing. This separation enables accurate simulation of large and complex structures while eliminating the need for real-time computation during the experiment.
Solution Approach 2:
The patent creates a numerical copy (numerical substructure) of the seismic isolation structure that can be simulated offline. This virtual replica allows complex computations to be performed in advance or independently, providing accurate seismic performance data without requiring real-time computational resources during the physical test.
3Device complexity
If offline hybrid iterative test is used, then equipment requirements are reduced, but iterative correction process is needed
Solution Approach 1:
The patent implements a feedback mechanism where the restoring force time history signal from the experiment substructure is fed back to the numerical substructure. This feedback loop enables iterative correction of the driving displacement time history signal, allowing the system to converge on accurate results while using offline processing to maintain productivity.
Solution Approach 2:
The patent changes the parameter of the driving displacement time history signal through iterative correction based on the restoring force feedback. By adjusting this key parameter in an offline iterative process, the system achieves convergence without requiring real-time modifications to the testing equipment or communication platform.
Data Source
AI summary
Present disclosure provides a test method and system for a seismic isolation structure, the method comprising: loading driving displacement time history signal into a substructure of the structure, recording restoring force time history feedback signal of the substructure; applying restoring force time history feedback signal to numerical substructure of seismic isolation structure, solving dynamic response of numerical substructure, recording structural displacement response time of the numerical substructure; calculating root-mean-square error (RMSE) of driving displacement time history signal and structural displacement response time signal; judging whether the RMSE is less than a threshold; if the RMSE is less than the threshold, ending the experiment; if the RMSE is not less than the threshold: correcting the time history signals according to a model identification algorithm, obtaining a corrected driving displacement time history signal of the next iteration, loading the corrected driving displacement time history signal onto the substructure, and repeating the steps.