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Influence and compensation of connection characteristics on shaking table control performance
Chunhua Gao1, Cun Li2, Zihan Yuan2
1College of Architecture and Civil Engineering, Xinyang Normal University, Xinyang, 464000, China. gaochunhua@xynu.edu.cn.
Scientific Reports
|March 22, 2024
Summary
This study addresses inaccuracies in earthquake simulation shaking tables by modeling flexible connections. A novel compensation algorithm improves system performance, enhancing waveform reproduction accuracy for seismic testing.
Area of Science:
- Mechanical Engineering
- Civil Engineering
- Seismology
Background:
- Earthquake simulation shaking tables often assume integrated components, deviating from real-world conditions.
- This assumption negatively impacts the accuracy of system waveform reproduction during seismic testing.
Purpose of the Study:
- To investigate the impact of flexible connections on shaking table performance.
- To develop a compensation algorithm to improve system accuracy and stability.
Main Methods:
- Simplified the connection between test load, table, and actuator using a spring-damping model.
- Analyzed the effects of load mass, connection frequency, and damping ratio.
- Proposed and implemented a flexible connection reaction force compensation algorithm.
Main Results:
- Flexible connections introduce resonance peaks, reducing effective bandwidth.
- The compensation algorithm expanded the effective bandwidth and eliminated resonance peaks.
- Improved waveform correlation coefficient (CC) and reduced root-mean-square error (RMSE).
Conclusions:
- Flexible connection characteristics significantly affect shaking table control performance.
- The proposed compensation algorithm effectively enhances system bandwidth, stability, and waveform reproduction accuracy.
- This method offers a viable solution for more realistic seismic simulations.
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