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vlaxacccleiation [my
O O O O —_.-._.
No Isolaion
Passive 1 (NRB)
Passive 2 (NRB+POD)
Skyhook
DA-SMC
Passive 1 Passive 2 Passive 3 Skyhook DA-SMC
(NRB) (NRB+-POD) (LRB)
Fig. 8 The max acceleration comparison of 10th
foor for the El Centre eathquakes
Fig. 9 Vibration transmissibihty
CONCLUSIONS
In this study, the disturbance-accommodating sliding mode controller of variable damper was presented and
it was applied to the building structure with base isolation. As a result, the conclusions were obtained as
follows.
(1) The semi-active damper has higher control performance on the vibration transmissibility than the passive
control and skyhook control at a wide frequency range.
(2) For El Centra earthquake as well as the other earthquakes, the present method reduces residual vibration
which appears in the uncontrolled case and also reduces the maximum response of the first story of the structure
in comparison with the passive control whose first mode damping ratio is the same as the semi-active
control
From to these result, the capability of D A-SMC for semi-active vibration isolation system is demonstrated
REFERENCES
Yoshida. S. and Yoshida. K.( 1997). Semi-Active Vibration Isolation Control Using Feedforward Information of
Disturbance. Proc ofASm Design Eng. and Tec. Conf. (CD-ROM), Paper No. DETC97/VIP-3820.
Dyke, S. J., Spencer, Jr., B. F. (1997). A Comparion of Semi-Active Control Strategies for the MR Damper.
Proceedings of the IASTED International Conference, Intelligent Information Systems.
Singh, M. P., Matheu, E. E.(1997). Active and Semi-Active Control of Structures Under Seismic
Excitation. Earthquake Eng Sturuct Dyn.26, 193-213.
Karaopp, D, (1997). Active and Semi-Active Vibration Isolation. Trans, of the ASMS, Special Anniversary
Deign Issue, 117,177-185.
Yoshida. K. and Fujio. T.(1999). Semi-Active Base Isolation for a Building Structure, Proceedings of ASME
Design Engineering Technical Conference(CD-ROM), Paper No. DETC99/MOVIC-8427.
Kang, S. and Yoshida, K. (1993). Vibration Isolation Control with Feedforward Link using ETCntrol Theory.
Proceedings of 'the JSME International conference on Advanced Mechatoronics, 645-649.