Takenaka Corporation

Tokyu Construction Co., Ltd.

Tokyo Construction Co., Ltd.

Kazuko Ishimaru

Takahiro Niiya

Shinji Ishimaru

A vibration suppressing structure including a main structure and a vibration suppressing section disposed in an upper portion of the main structure which is provided with an auxiliary structure adapted to undergo vibration in response to the vibration of the main structure occurring due to a disturbance, an auxiliary mass, a driving device, and a damper. The displacement of the auxiliary structure caused by the vibration is transmitted to the auxiliary mass via the driving device, and the auxiliary mass is controlled by an amount of movement directly proportional to the amount of displacement. The vibration suppressing section is arranged such that the damping coefficient of the damper, the magnitude of the auxiliary mass, and the ratio of the amount of movement of the auxiliary mass to an amount of displacement of the auxiliary structure which are included in a mass matrix M.sub.T for the vibration suppressing section, a damping matrix C.sub.T, a stiffness matrix K.sub.T, a location vector i.sub.T of a disturbance, are adjusted in such a manner that the relationships of (.omega..sub.T j).sup.2.M.sub.T.I.sub.T =K.sub.T.I.sub.T and 2h.sub.T..omega..sub. T j.M.sub.T.I.sub.T =C.sub.T.I.sub.T hold, with respect to a natural frequency .omega..sub.T.sup.j of a predetermined damping factor h.sub.T, thereby constituting a system of a pseudo-single degree of freedom. A vibration suppressing structure is obtained which is capable of effectively suppressing vibrations in a multi-storied structure and which can make effective use of the space within the structure.

Vibration suppressing structure

A vibration suppressing structure including a main structure and a vibration suppressing section disposed in an upper portion of the main structure which is provided with an auxiliary structure adapted to undergo vibration in response to the vibration of the main structure occurring due to a disturbance, an auxiliary mass, a driving device, and a damper. The displacement of the auxiliary structure caused by the vibration is transmitted to the auxiliary mass via the driving device, and the auxiliary mass is controlled by an amount of movement directly proportional to the amount of displacement. The vibration suppressing section is arranged such that the damping coefficient of the damper, the magnitude of the auxiliary mass, and the ratio of the amount of movement of the auxiliary mass to an amount of displacement of the auxiliary structure which are included in a mass matrix M.sub.T for the vibration suppressing section, a damping matrix C.sub.T, a stiffness matrix K.sub.T, a location vector i.sub.T of a disturbance, are adjusted in such a manner that the relationships of (.omega..sub.T.sup.j).sup.2 .multidot.M.sub.T .multidot.i.sub.T =K.sub.T .multidot.i.sub.T and 2h.sub.T .multidot..omega..sub.T.sup.j .multidot.M.sub.T .multidot.i.sub.T =C.sub.T .multidot.i.sub.T hold, with respect to a natural frequency .omega..sub.T.sup.j of a j-th mode and a predetermined damping factor h.sub.T, thereby constituting a system of a pseudo singe degree of freedom. A vibration suppressing structure is obtained which is capable of effectively suppressing vibrations in a multi-storied structure and which can make effective use of the space within the structure.

A weight is disposed in an arbitrary story of a structure so as to be movable relative to a direction of motion of the structure. Rotary members are supported in the weight. Rigid members meshing with gears provided on each rotary member are slidably fitted in the weight. These rigid members are respectively coupled to a ceiling and a floor via coupling members. The rotary members and the rigid members are disposed on the weight in correspondence with two horizontal directions. As a result, a horizontal motion of the floor of the structure is temporarily converted into a rotational motion by the rotary members, and is then converted into a horizontal motion so as to be transmitted to the ceiling. At this time, since the rotary members are pivotally supported in the weight, the weight can be moved in the opposite direction to that of the floor without undergoing an arcuate motion, thereby exhibiting the effect of reducing an input of vibration.

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Sohka, Japan

Kazuko Ishimaru