An active base isolation system , which uses absolute vibration control technology , has been applied to the real fUll scale buil 砒 lg , Obayashi Corporation Tecbnical Research Institute Main Building ' Techno − Station ' . This building is the 丘rst active base isolation bu 皿ding an over the world . The absolute vibration control is an active vibration control method for base isolated structures to stay in血 e absolute space and to have vibration free environment , by applying control forces through actuators duing earthquakes . Four l 100kN hydraulic ac 加 ators , two in each horizontal dire α ion , are i 皿 staned in the Techno Station to reduce the seismic response to l/100f the conven 丘onal passive base isolation system . When applying active control to a real 血 n scale building , it is necessary to install fail safe mechanism in case that actuators are over −10aded by input ground m α ion of more than expected level or unstable control condition . As fa 皿 safe mechanism for匸 his absolute vibration control , the trigger systern using friction dampers has been developed and is installed between actuators and reaction foundations .
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