| 摘要 |
PROBLEM TO BE SOLVED: To cause a hydraulic damper used as a synchronization mass damper (TMD) or a damper for base isolation structure and the like to have a function for increasing a load generated when a speed exceeds a specified value.SOLUTION: Hardening hydraulic circuits 51, 52 for realizing an attenuation characteristic in which an attenuation coefficient is increased as a speed generated at a hydraulic damper 1 itself is increased are connected side-by-side between hydraulic chambers 41, 42. The hardening hydraulic circuits 51, 52 are constituted by a pressure regulator valve 61 opened or closed in response to a pressure in a high pressure side hydraulic chambers 41(42) and additional hydraulic valves 62(19) always kept in an operating state; a selector valve 71 and a selector valve 72 connected between a spring chamber 61a of the pressure regulator 61 and a hydraulic chamber 42(41) at a low pressure side so as to select an operating state of the pressure regulator valve 61; a buffer 8 connected between the hydraulic chambers 41(42) at a high pressure side and the other selector valve 72 so as to select the selector valve 72 kept at a closed state to a released state; and a relief valve 9 for specifying the maximum pressure in the buffer 8. |
