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 T for the vibration suppressing section, a damping matrix C T , a stiffness matrix K T , a location vector i T of a disturbance, are adjusted in such a manner that the relationships of (ω T j ) 2 ·M T ·i T =K T ·i T and 2h T ·ω T j ·M T ·i T =C T ·i T hold, with respect to a natural frequency ω T j of a j-th mode and a predetermined damping factor h 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.

Vibration suppressing structure

In an improved power transmission belt, the circumferentially disposed reinforcing cords are made from multi-filament yarns of heterofilaments. These cords, when fused, have good inter-filament bonding without the solvent of the solvent/adhesive systems.

Heterofilaments for cord reinforcement in rubber goods

A damper system for installation in a structure to dissipate seismic and wind energy transmitted to the structure, includes first and second pairs of elongated members forming an outer parallelogram, third and fourth pairs of elongated members forming an inner parallelogram, and a pair of energy dissipating devices connected between the parallelograms for dissipating the energy transmitted to the structure.

Energy dissipation damper system in structure subject to dynamic loading

PURPOSE:To display damping force to seismic force by providing the rigid foundation around the foundation of a structure to be constructed on the weak ground, and jointing this structure to the rigid foundation by various dampers. CONSTITUTION:Rigid foundation structure 3 with its vertical deformation firmly fixed by piles 4, ground anchors 5, and the like is provided around the foundation 2 of a structure 1, and the structure 1 and the rigid foundation structure 3 are jointed by various dampers 8, vibration control devices. The piles 4 driven into the ground include the case of being driven directly under the structure 1 or the case of soil improvement in place of the piles 4. The vertical deformation of the foundation part at the time of the top part of the structure 1 being horizontally deformed by seismic force is forced to act upon the dampers 8 so as to perform required earthquake control. In addition to thus reducing the fixed quantity of vibration to a large earthquake, an added weight type vibration control device 6 is installed at the top part or the like of the structure 1, and various vibration control devices 7 passive, active, and the like are further installed in the important positions of the structure 1 so as to reduce vibration effectively in combination with the dampers 8 at the foundation part.

Eaerthquake resistant structure for construction

Dynamic vibration reducing roof

Dynamic earthquakeproof method and device utilizing weight of building body

Dynamic vibration damping method and apparatus utilizing weight of roof of building

Method and apparatus for dynamic damping of vibration of building

PURPOSE:To attempt to reduce vibration by interposing a toggle mechanism between suitable two points of a structure vibrates and providing a damping device at the central part of this toggle mechanism. CONSTITUTION:A toggle mechanism 3 is interposed on the diagonal line between two points of a rahmen basic structure comprised of a pillar 1 and beam 2. A damping device 4 such as a spring and a damper is mounted at the central part of this mechanism 3. Therefore, when the beam 2 vibrates in the horizontal direction generating bending moment in the pillar 1, it is transmitted to the device 4 through the mechanism 3, resistance force of the device 4 is reversely amplified through the machanism 3 and acts to suppress the bending moment of the pillar 1, thereby damping of a large-sized structure can be effectively performed.

Damping device of structure

PURPOSE:To attempt to effectively reduce vibration by comparing the vibration property information of a structure measured by means of a sensor with well known characteristics, computing the feedback gain for controlling, and giving a control force to the structure by means of control signal. CONSTITUTION:A sensor 2 is mounted, for example, to the beam of an elevated bridge as a structure, and converts the property of of its vibration to electric signal. Electric signal amplified by an amplifier 3 is converted by an A/D con verter 4 and inputted to a controller 5 such as a digital controller, etc. The controller 5 compares the input signal of vibration property with well known characteristics of the structure, for example, natural period, attenuation, etc. of the structure, and computes the feedback gain to obtain control force most appropriate to reduce the vibration of the beam of the structure. This calculated feedback digital signal is converted by a D/A converter 6, and fed to an actua tor 7 as instruction signal.

Ide Tomoyoshi

Papers

Dynamic earthquakeproof method and device utilizing weight of building body

Dynamic vibration damping method and apparatus utilizing weight of roof of building

Method and apparatus for dynamic damping of vibration of building

Damping device of structure

Damping method of structure and its device