2021 Fiscal Year Annual Research Report
Passive negative stiffness device for vibration control of coupled structures
| Project/Area Number |
21J10149
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| Research Institution | Hokkaido University |
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Principal Investigator |
LONGJAM SONIA 北海道大学, 大学院工学院, 特別研究員(DC2)
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| Project Period (FY) |
2021-04-28 – 2023-03-31
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| Keywords | Negative stiffness / Coupled structures / Transfer function / Optimization |
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| Outline of Annual Research Achievements |
An analytical investigation was conducted on the vibration control effects of coupled vibration control (CVC) structures incorporating negative stiffness as the connecting spring element between the mainframe and subframe. The basic characteristics of negative stiffness as the connecting device were assessed by investigating the transfer function of the vibrating models.
The seismic response of CVC structures incorporated with negative stiffness at the connecting portion were numerically investigated. Coupled structures with different natural periods and structural parameters were used for the linear and nonlinear time history seismic response simulation under various earthquake motions.
The analysis proved an effective control performance of CVC structures by optimized negative stiffness.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
Numerical investigation on linear and nonlinear time history seismic response simulation using the multi degree of freedom CVC structures with different natural periods and structural parameters linked with negative stiffness. Study the optimization problems for the location in the height of the connection elements.
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| Strategy for Future Research Activity |
Experiment using the shake table test for coupled vibration controlled structures connected with passive negative stiffness device for the validation of the theoretical and numerical investigation.
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