Optimization research on the high-performance 3-dimensional base isolation system using a velocity reduction mechanism

本研究的目的是开发一种新型的基于减速机构的三维基础隔震系统，并为实际应用奠定基础。2003年，对摩擦阻尼器的响应位移和响应加速度效应、连接轴的摇摆抑制效应进行了数值研究。从这些结果中，证实了水平、竖向隔震能力。并验证了其对水平和竖向同时激励的隔震能力。2004年，通过数值计算评估了Hyogoken Nambu地震和Shiigata Chuetu地震等不同频率分量地震波的隔震能力。由于水平摩擦力会随着竖向反应加速度的变化而变化，因此对于采用滑移垫的基础隔震体系而言，水平反应与竖向反应是相互耦合的。于是，数值型S…对不同相位差、不同幅值的地震输入波进行了仿真，阐明了摩擦力变化对隔震特性的影响。此外，制作了1/4比例的模型，并利用竖向振动台进行了地震激励试验。在以往的试验中，发现了蜗杆传动系统的不足。然后，利用螺旋弹簧建立了另一种减速系统。利用该系统对竖向隔震能力进行了试验验证，并于2005年对试验装置进行了进一步改进，确定了水平隔震能力和水平竖向隔震能力。在本试验中，激励频率、激励幅度和质量偏心都是不同的。在数值模拟中，对居住在隔震房屋中的人的反应进行了评估，为新开发的三维基础隔震系统的优化提供了基础数据。较少

The purpose of this study is to develop a new 3-dimensional base isolation system using a velocity reduction mechanism and to establish a fundamental technologies for actual application.In 2003, the effects of the friction damper for response displacement and response acceleration, the effects of the connecting shaft for rocking suppression are studied numerically. From these results, the horizontal, vertical isolation capability are confirmed. And the isolation capability for the horizontal and vertical simultaneous excitation is also confirmed.In 2004, the isolation capabilities for the various seismic waves with different frequency components such as Hyogoken Nambu Earthquake and Shiigata Chuetu Earthquake are evaluated numerically. It is considered that for the base isolation systems using sliding pads, the horizontal response will coupled with the vertical response, because the horizontal friction force will change according to the vertical response acceleration. Thus, numerical s … More imulations are performed for the seismic input waves with various phase differences and amplitudes, and the effects of the friction force change on the isolation characteristics are clarified. Moreover, a 1/4 scale model is fabricated and the seismic excitation tests are performed using a vertical shaking table. In the previous tests, the disadvantages of the worm gear system are found. Then, the other velocity reduction system is established using a spiral springs. Using this new system, the vertical isolation capability is also confirmed experimentally.In 2005, the test apparatus is modified furthermore and the horizontal isolation capability and the horizontal/vertical isolation capability are confirmed. In this tests, the excitation frequency, excitation amplitude and the mass eccentricity are varied. And in the numerical simulations, the response of the human living in the isolated houses is also evaluated.From these studies, the fundamental data are obtained for the optimization of the newly developed 3-dimensional base isolation system. Less