摘要:
There is described a control device particularly suitable for use in the construction of buildings such as continuous girder or truss bridges, elevated highways and the like, for the purpose of controlling vertically imposed loads, more particularly, for the purpose of attenuating mechanical vibrations or impacts as will be caused by braking or starting land vehicles or earthquakes, dispersing horizontally an acting forces at the joint of an upper structure of a bridge such as a girder and a lower structure such as a pier, particularly at a fixed shoe (bridge bearing) on the pier.
摘要:
A seismic isolation apparatus is structured such that a pair of seismic isolation mechanisms are formed each having a pair of upper and lower clamping members formed in the shape of a rectangular frame, wherein upper and lower roller guide surfaces, in each of which a longitudinal central portion is formed as a concavely arcuate curved surface and portions respectively extending therefrom are formed as convexly arcuate curved surfaces, are formed on the four sides of the upper and lower clamping members, and wherein rollers each having a circular cross section are respectively interposed between the upper and lower roller guide surfaces. The pair of seismic isolation mechanisms are installed by being superposed on top of each other such that the rolling directions of the rollers in the two seismic isolation mechanisms are perpendicular to each other. During the occurrence of an earthquake, the rollers are adapted to roll in contact with the upper and lower roller guide surfaces so as to absorb and dampen seismic waves in the longitudinal and transverse directions of the apparatus.
摘要:
A method of applying a floor vibration-damping work and a floor vibration-damping device supporting horizontally displaceably respective supports points of the floor structure on a fixed floor and supporting the other respective points of said floor structure on the fixed floor with a position restoring function relative to the horizontal displacement, as well as a triggering function and a damping function during said displacement.
摘要:
A viscous shear-type damper is provided with a casing including an upper cover which is horizontally movable and a container portion having a rectangular parallelepiped-shaped accommodating space which is covered by the upper cover; an engaging block provided in the accommodating space in such a manner as to be suspended from a lower surface of the upper cover; a plurality of movable resistance plates which are arranged horizontally one above another in the accommodating space of the container portion while maintaining fixed intervals therebetween and engaging with the engaging block; a plurality of fixed resistance plates which are arranged horizontally and fixed to the casing and which are each interposed between adjacent ones of the movable resistance plates while maintaining a very small gap therewith; a viscous material filled in the accommodating space of the container portion to fill the gap between adjacent ones of the movable resistance plates and the fixed resistance plates; and rectifying sections respectively disposed at end portions of the fixed resistance plates to allow the viscous material to flow.
摘要:
A damper used to damp roll vibration of an automotive power unit includes housing in which a disc is immersed in a highly viscous liquid, and a linkage which has universal joints formed at each end thereof. The linkage induces relative rotation between the housing and the disc. A resilient vibration attenuating arrangement is included in one or both of the universal joints for insulating the vehicle chassis from vibration which tends to be freely transmitted through the damper per se and cause cabin reverberation noise.
摘要:
A vibrational energy absorbing apparatus 1 includes: a reciprocating member 2 which is reciprocatable in H directions between positive and negative maximum displacement positions D±max with respect to an origin position O; a damping-force generating means 3 for generating a damping force R with respect to the reciprocating motion of the reciprocating member 2 in the H directions; and a controlling means 4 for controlling the damping-force generating means 3 so as to cause the damping-force generating means 3 to generate a fixed damping force R in the respective movement of the reciprocating member 2 in the H direction from the positive and negative maximum displacement position D±max to the origin position O in the reciprocating motion thereof in the H directions, while causing the damping-force generating means 3 to substantially not generate the damping force R in the respective movement of the reciprocating member 2 in the H direction from the origin position O to the positive and negative maximum displacement position D±max following that movement in the H direction.
摘要:
A dynamic vibration absorber (1) includes: a weight (2); a frame body (3) which surrounds the weight (2); a total of four pairs of vertically mounted U-shaped leaf springs (4, 5, 6 and 7) which are interposed between the frame body (3) and the weight (2) so as to hold the weight (2) with respect to the frame body (3) movably with respect to all directions in a horizontal plane and immovably in a vertical direction (V); and a damping mechanism 8 for damping the vibration of the weight (2) in the horizontal plane.
摘要:
A passive vibration-damping unit in which movable upper members with a weight mounted thereon are superposed on fixed lower members with roller members interposed therebetween is installed in a highest story of a high-rise building. An active vibration-damping unit for actively causing the movable upper members of the passive vibration-damping unit to move in a shaking manner by means of a servo motor is incorporated in the passive vibration-damping unit. When the vibration of the building has occurred, the weight is allowed to move forcibly in the vibration-damping direction by means of the active vibration-damping unit. When the vibration has reached a limit value of the relative displacement of the active vibration-damping unit or a limit value of the torque of the servo motor, only the operation of the passive vibration-damping unit is continued. When the vibration has subsided to a certain extent, the active vibration-damping unit is operated again.
摘要:
An apparatus for damping a plurality of vibrations applicable to an apparatus for mounting a vehicular engine on a vehicle body. The apparatus comprises: (a) a first block; (b) a second block; (c) a block member for damping first vibrations having high frequencies and having large amplitudes, the first vibrations being generated and transmitted from the first block to the second block; and (d) at least one viscous shearing force resistance generator for damping second vibrations having low frequencies and large amplitudes, the second vibrations being generated and transmitted from the first block to the second block and from the second block to the first block. The viscous shearing force resistance generator is formed within the block member. The viscous shearing force resistance generator, e.g., comprises: (a) a cavity formed within the block member; (b) a viscous fluid having a high viscosity filled within the cavity; and (c) at least one shearing resistant element disposed within the cavity with minute gaps against the opposing inner wall surfaces of the cavity.
摘要:
A dynamic vibration absorber (1) includes: a weight (2); a frame body (3) which surrounds the weight (2); a total of four pairs of vertically mounted U-shaped leaf springs (4, 5, 6 and 7) which are interposed between the frame body (3) and the weight (2) so as to hold the weight (2) with respect to the frame body (3) movably with respect to all directions in a horizontal plane and immovably in a vertical direction (V); and a damping mechanism 8 for damping the vibration of the weight (2) in the horizontal plane.