| 摘要 |
PURPOSE:To positively reduce vibration generating in a structue to be protected from earthquake by a method in which an acceleration generated in the structure to be protected from earthquake is measured, and according to the results of the measurement, air pressure to be supplied to a pneumatic spring is controlled to an optimum value. CONSTITUTION:When seismic vibration is applied from a base 1 to a structure 4 to be protected from earthquake, an acceleration generated in the structure 4 is measured by an accelerometer 11, and the results of the measurement are given to a controller 12 where an electric signal such as to be optimum for protecting it from earthquake is sent out according to input signals. A torque motor 10 is controlled by the electrical signal, a pneumatic pilot valve 9 is switched thereby, and air pressure to be supplied to the pneumatic spring 7 is controlled to an optimum value to reduce the acceleration to be generated in a mobile table 2. The internal pressure of the pneumatic spring 7 is fedback to the control system, and acceleration generating in the structure 4 can thus be positively minimized. |
