Stuby of Nonlinear Vibration Characteristics of Rubber Base Isolation System with Hysteresis Characteristics Depending on Frequency and Amplitude of Displacement

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Study of Nonlinear Vibration Characteristics of Rubber Bearing for Base Isolation System with Hysteresis Characteristics Depending on Frequency Amplitude of DisplacementThetest pieces were made of high damping rubber bearing material for this study. TOYORUBBER INDUSTRY co-operated with us to fabricate the test pieces for the experiment Hysteresis characteristics data was obtained to analysis nonlinear vibrational properties of rubber. We experimented with the following two test pieces.a) Surface presssure ; 50 kg/cm^2 lessOuter diameter ; 180phiInterior diameter ; 45phiThickness ; 3.4mmNumber of stratum ; 51Aratio of form S_1 ; 9.9S_2 ; 0.78b) Srface pressure ; 100 kg/cm^2 lessOuter diameter ; 130phiInterior diameter ; 40phiThickness ; 2.82mmNumber of stratum ; 33A ratio of form S_1 ; 7.98S_2 ; 0.97The following three test parameters were experimented with 1) Frequency ; 0.1-2.0 Hz 2) Axial force ; 2.4-9.5ton 3) Amplitude ; 1-30mmThe following results were obtained :1) Wecould determine the vibrational properties of the rubber bearing for a base isolation system (dynamic spring constant K and damping factor C) by changing the hysteresis characteristics of the rubber bearing base isolation system using restoring force model of the power function type. We could also prove the accuracyand correctness of this method.Results concerning nonlinear vibrational properties of rubber in relation o amplitude, as the amplitude increases, C and K slowly decrease.3) As higher frequency's are applied, C decreases and K also decreases, but not as much as C.4) As the axial force increases, C inreases but K decreases. Since the above four items are understood, now we will study the'effects of stronger nonlinear vibration characteristics of rubber bearing for a base isolation system with larger amplitudes applied. A paper is currently being prepared about this study.