Design and simulation of hydraulic shaking table
Recent industrial progress and computational technology made it possible to construct more complex structures. Vibration of these structures due to seismic strength must be measured and proved to prevent them from damage when they arc subjected to earthquake. However, the accuracy of estimatin...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
2006
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/7134/1/24p%20KHAIRULNIZAM%20NGADIMON.pdf http://eprints.uthm.edu.my/7134/ |
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| Summary: | Recent industrial progress and computational technology made it possible to
construct more complex structures. Vibration of these structures due to seismic
strength must be measured and proved to prevent them from damage when they arc
subjected to earthquake. However, the accuracy of estimating the effect of vibrating
structures is limited by the mathematical models, which are normally simplified
from the actual complex structures. Due to this problem, a study on the development
of shaking table is proposed. The main purpose of this study is to obtain the design
specifications for a 1-axis (horizontal) hydraulic shaking table with medium loading,
which can function primarily as an earthquake simulator and a dynamic structural
testing apparatus. The project employs a three stage electrohvdraulic servovalvc.
actuator system complete with hydraulic system as the power and drive unit.
Mathematical model for closed loop control experimentation was presented and used
to investigate the influence of various parameters on the overall system. The
investigation includes the study on the effect of controller gain setting (for PD and
AFC), disturbances and system stability. Time domain analysis using computer
simulation was conducted to explain and predict the system's response. Comparison
between PD and PD-AFC controllers was done and it was found that latter PD-AFC
fulfills the performance and robustness specifications for this project. Other design
outcome that limits the change of disturbances on the system was also identified and
taken as the framework for real world. This suggests that the next stage in
implementation of the designed system can be made for the purpose of an
earthquake simulator, since it works very well especially at low frequency level of
shaking (0 to 5 Hz). |
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