Abstract:
A variable friction bearing is provided to prevent large displacement and residual displacement by increasing frictional force if the displacement of an upper structure is increased by earthquake load. The variable friction bearing(1) contains a lower bearing(2) coupled to a lower structure such as a pier, etc. and provided with a concave friction part(4) at the center, and an upper bearing(3) coupled to an upper structure such as a girder of a bridge, etc. and provided with a convex friction part(5) to move in the concave friction part of the lower bearing to occur frictional force if the upper structure moves due to earthquake load.
Abstract:
A dual-stage tuned mass damper device using an MR fluid type brake and a method for controlling vibration of a structure using the same are provided to efficiently reduce the response of a main structure by actively changing the rigidity of the damper device through a rigidity adjusting apparatus to tune the damper device to a higher frequency band. A dual-stage tuned mass damper device(10) using an MR fluid type brake includes a mass body(11), a variable rigidity spring member(12), and an attenuator(13). The mass body has a predetermined mass. The variable rigidity spring member is installed between the mass body and a main structure(1). The attenuator has a predetermined attenuation coefficient. The variable rigidity spring member has a first spring(12a), a second spring(12b), and a rigidity adjusting apparatus(20). The first spring is installed between the main structure and the rigidity adjusting apparatus, and the second spring is installed between the rigidity adjusting apparatus and the mass body. The rigidity adjusting apparatus is formed of the MR fluid type brake whose movement is fixed by the solidified fluid in case that a magnetic field is formed.
Abstract:
A dual-stage tuned mass damper device and an oscillation control method for a structure using the same are provided to have an efficient response reduction effect according to the characteristics of load by changing the rigidity of a spring member through the control of a rigidity adjusting apparatus. A dual-stage tuned mass damper device includes a shaft(14) whose one end is fixed to a main structure, and the other end has a movable mass body(11). A rigidity adjusting apparatus(20) of a variable rigidity spring member(12) is installed in the shaft to be movable along the shaft. A first spring(12a) and a second spring(12b) are connected to the rigidity adjusting apparatus to surround the shaft. The rigidity adjusting apparatus changes the whole rigidity of the tuned mass damper device according to load by changing the rigidity of the spring member through the control of contraction of the first spring.
Abstract:
PURPOSE: A multilayer dioxide electrode for a dye-sensitized solar cell, a manufacturing method thereof, and the dye-sensitized solar cell are provided to increase an amount of light currents by increasing an amount of dye absorption by a high pore structure. CONSTITUTION: A multilayer dioxide electrode for a dye-sensitized solar cell is formed on a transparent conductive substrate. A light sensitive dye layer is absorbed in a surface facing the transparent conductive substrate. The multilayer dioxide electrode for the dye-sensitized solar cell includes a titanium dioxide deposition layer and a mesopore titanium dioxide particle coating layer. The mesopore titanium dioxide particle coating layer is stacked on the deposition layer.
Abstract:
본 발명은 주구조물에 설치되어 주구조물의 진동을 제어하는 동조질량감쇠장치를 구성함에 있어서, 유압식 브레이크장치를 이용하여 동조질량감쇠장치의 강성을 변화시킴으로써 하중의 주파수 특성에 맞추어 적절한 감쇠성능을 발휘할 수 있도록 구성한 강성조절장치를 이용한 이중동조질량감쇠장치 및 이를 이용한 구조물의 진동제어방법에 관한 것이다. 본 발명에서는, 주구조물(1)에 장착되어 진동수를 주구조물(1)의 고유주기에 동조시켜 하중에 의한 주구조물(1)의 진동을 감소시키는 동조질량감쇠장치(10)로서, 소정 질량을 가지는 질량체(11)와, 상기 질량체(11)와 주구조물(1) 사이에 설치되어 있으며 그 강성이 변화되는 가변강성 스프링부재(12)와 소정의 감쇠계수를 가진 감쇠기(13)를 포함하며; 상기 가변강성 스프링부재(12)는, 제1스프링(12a), 제2스프링(12b) 및 강성조절장치(20)를 포함하여 구성되어 있으며; 상기 제1스프링(12a)은 주구조물(1)과 상기 강성조절장치(20) 사이에 설치되고, 상기 제2스프링(12b)은 상기 강성조절장치(20)와 상기 질량체(11) 사이에 설치되며; 상기 강성조절장치(20)는 하중의 실시간 측정, 분석에 의하여 구해지는 하중의 주파수 성분에 따라 작동되어 상기 제1스프링(12a)의 신축을 제어하여 상기 가변강성 스프링부재(12)의 강성을 변화시킴으로써, 하중에 맞추어 가변강성 동조질량감쇠장치(10)의 전체 강성을 변화시키는 것을 특징으로 하는 동조질량감쇠장치가 제공되며, 이러한 장치를 이용한 구조물의 진동제어방법도 제공된다. 감쇠장치, 질량체, 가변, 강성, 진동 제어