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1. 发明专利

JPH09302614A SUSPENSION BRIDGE 失效
公开(公告)号：JPH09302614A
公开(公告)日：1997-11-25
申请号：JP11622196
申请日：1996-05-10
申请人： NIPPON KOKAN KK
发明人： MURAKAMI TAKUYA , TAKEDA KATSUAKI , FUJISAWA NOBUMITSU , TAKAO MICHIAKI
IPC分类号： E01D11/00 , E01D2/00 , E01D11/02 , E01D19/14 , E01D19/16
摘要： PROBLEM TO BE SOLVED: To improve a workability and to enhance a wind speed at which a bride beam flutters. SOLUTION: Cables 3, 3 are suspended at widthwise opposite sides of a bridge beam 5 by means of towers X, Y composed of tower columns 2, 2, and a center cable 3 is suspended between beams 8 extending between the tower columns 2, 2. Further, a plurality of hangers 4 for hanging the bridge beam 5 are vertically extended between the opposite side and center cables 3 and the widthwise opposite sides of the bridge beam 5. Further, oblique hangers 7 for hanging the bridge beam 5 is extended between the center cable 3 and the widthwise opposite sides of the bridge beam 5.

2. 发明专利

JPS63147072A VIBRATION DAMPER 失效
公开(公告)号：JPS63147072A
公开(公告)日：1988-06-20
申请号：JP29163086
申请日：1986-12-09
申请人： NIPPON KOKAN KK
发明人： TSUJI MATSUO , FUJISAWA NOBUMITSU , TSUMURA NAOYOSHI , HORIUCHI HIROSHI
IPC分类号： E04H12/00 , E01D1/00 , E01D19/14 , E04H9/14 , F16F15/02

3. 发明专利

JPS5821536A EXCITING DEVICE FOR CABLE 失效
公开(公告)号：JPS5821536A
公开(公告)日：1983-02-08
申请号：JP12014681
申请日：1981-07-31
申请人： NIPPON KOKAN KK
发明人： FUJISAWA NOBUMITSU , MURATA MAMORU
IPC分类号： G01M7/02 , G01L5/04
摘要： PURPOSE:To easily excite a cable by a normal mode and to perfrom a high- precise measurement of a natural frequency, by a method wherein an exciting frequency and an exciting force are caused to change continuously, and a cushioning spring is located between a connection cable and a slide metal. CONSTITUTION:A variable speed motor 6 is secured to a base bed 6 to turn a fly wheel consisting of a crank metal 7. A crank pin 8 is situated so that an eccentric distance from the crank metal 7 can be adjusted, and is moved by a crank pin moving device 10. With the crank metal 7 turned, a slide metal 16 is guided by a guide member 18 attached to the base bed 5, and reciprocates in a direction of radius. A displacement gauge 19 outputs the reciprocating displacement distance of the slide metal, and a pulse meter 20 outputs the number of revoutions or the number of exciting frequencies of the motor 6. A connection wires 25, stretched between the other end of the slide metal 16 and a cable 3 to be excited, is provided with a cushioning spring 26 in the middle of the wire, and the wire 25 is connected to the cable 3 through a sleeve 27 for connecting the wire.

4. 发明专利

JP2001041846A METHOD AND DEVICE FOR SUPPORTING MODEL FOR WIND TUNNEL TEST 失效
公开(公告)号：JP2001041846A
公开(公告)日：2001-02-16
申请号：JP21920899
申请日：1999-08-02
申请人： NIPPON KOKAN KK
发明人： MURAKAMI TAKUYA , FUJISAWA NOBUMITSU
IPC分类号： G01M9/04 , G05D19/02
摘要： PROBLEM TO BE SOLVED: To easily and readily detect an aerodynamic force with high accuracy with a simple constitution. SOLUTION: A model 11 for wind tunnel test is set up in a state such that the model 11 can be freely elastically deformed in the flexural and torsional directions by using spring members 131-138 and, at the same time, the vibration characteristic of the model 11 is controlled in such a way that the members 131, 132, 135, and 136 are movably arranged through actuators 141-144 and the flexural and torsional vibrations of the model 11 are detected by means of flexural and torsional vibration sensors 15 and sensor 16, respectively. Then the elastically supporting points of the spring members 131, 132, 135, and 136 are moved by driving the actuators 141-144 based on the detected flexural and torsional vibrations.

5. 发明专利

JPS6366434A AIR TUNNEL TESTER 失效
公开(公告)号：JPS6366434A
公开(公告)日：1988-03-25
申请号：JP21078886
申请日：1986-09-09
申请人： NIPPON KOKAN KK
发明人： FUJISAWA NOBUMITSU , KITAGAWA KIICHI , SONOBE YOSHIHIRO , KATO SHINJI
IPC分类号： G01M7/02 , G01M7/00 , G01M9/00 , G01M9/08
摘要： PURPOSE:To enhance the ratio between torsion and flexure frequencies without an increase in the polar inertial moment, by applying a spring constant of a coil spring for flexure and a spring constant of a coil spring for torsion independently. CONSTITUTION:Coil springs 11 and 11a for vertical flexure and coil springs 12-12c for horizontal torsion are arranged independently and when wind 8 is provided from the direction of the arrow, this apparatus vibrates, where flexure frequency is determined by the springs 11 and 11a, and the torsion frequency by the springs 12-12c and the interval (b) therebetween. When a model 5 vibrates in vertical flexure, the springs 11 and 11a extend or reduce but the springs 12-12c little do and hence the flexure frequency can be determined by the springs 11 and 11a only. Likewise, when the model 5 vibrates in torsion, the springs 11 and 11a will not extend or reduce and hence the torsion frequency can be determined by the springs 12-12c only. A larger ratio between torsion and flexure frequencies can be obtained simply by increasing the strength of the springs 12-12c. Thus, an increase in the torsion frequency (f) in noway contributes to a larger polar inertial moment.

6. 发明专利

JPH04198507A DAMPING METHOD FOR AERODYNAMIC VIBRATION OF STRUCTURE 失效
公开(公告)号：JPH04198507A
公开(公告)日：1992-07-17
申请号：JP32607090
申请日：1990-11-29
申请人： NIPPON KOKAN KK
发明人： FUJISAWA NOBUMITSU , SONOBE YOSHIHIRO
IPC分类号： E01D1/00 , E01D2/04 , E01D11/02 , E01D11/04
摘要： PURPOSE:To suppress aerodynamic vibration of the main girder by a method in which a plurality of nozzles are set at given intervals in the longitudinal direction of the main girder on the corners of the box-like main girder of bridge and air is jetted from the nozzles to the opposite directions (longitudinal direction, widthwise direction, or vertical direction of main girder). CONSTITUTION:Nozzles 20 are set at a given interval in the longitudinal direction (X-direction) on the corners of a main girder 2, and ports 20a and 20b through which air is jet to opposite directions are provided to the nozzles 20. When the main girder 2 receives wind 6 in the sideward direction (Y-direction), the nozzles 20 operate to form air stream 21, where swirl produced on the girder 2 is disturbed to vary the flow and rate of the swirl. The air stream 21 is formed intermittently in the longitudinal direction (X-direction), and nonsteady air force by swirl on the girder 2 is also varied to suppress the vibration in the Z-direction of the main grider 2. Since the downflow rate of swirl is also varied, the resonance of nonsteady air force and vibration can be prevented. Aerodynamic vibration of the main girder can thus be suppressed.

7. 发明专利

JPH02232404A BRIDGE EQUIPPED WITH PREVENTIVE MEASURES FOR AERODYNAMIC VIBRATION 失效
公开(公告)号：JPH02232404A
公开(公告)日：1990-09-14
申请号：JP5008189
申请日：1989-03-03
申请人： NIPPON KOKAN KK
发明人： FUJISAWA NOBUMITSU , TAKEDA KATSUAKI , WADA HIROHISA
IPC分类号： E01D1/00 , E01D2/04 , E01D11/02 , E01D11/04
摘要： PURPOSE:To contrive to reduce amplitude of vortex excitation by providing gratings over the deck surface between each of both end parts of a main girder of a bridge and each of side stringers provided on both ends of the bridge, and by further providing guide plates on the underside of the bridge at each of positions a little closer to the center of the bridge. CONSTITUTION:Gratings 20 are formed over a deck 3 at positions near side stringers 5 installed at the opposite sides of a bridge 1, and at the side ends of the deck, a little closer to the center of the bridge 1, guide plates 21 are provided facing downwardly aslant, with their lower ends made lower than the lower ends of the side stringers 5. The bridge is made in such structure that lateral wind blowing to the bridge runs from the underside through the gratings 20 to the surface of the deck 3 being guided by the guide plates 21. Air flow 22 is then made to form a second boundary layer 23 along the surface of the deck 3. Then the second boundary layer, interacting with a strong boundary layer 7, decreases negative pressure applying to the deck surface and restrains generation of vortex excitation, dislocating the phase. Thereby amplitude of the vortex excitation can be reduced and the vortex produced at the surface of the deck 3 becomes smaller.

8. 发明专利

JPS62209244A HORIZONTAL PENDULUM TYPE DYNAMIC VIBRATION REDUCER 失效
公开(公告)号：JPS62209244A
公开(公告)日：1987-09-14
申请号：JP4157986
申请日：1986-02-28
申请人： NIPPON KOKAN KK
发明人： TSUJI MATSUO , FUJISAWA NOBUMITSU , TSUMURA NAONOBU , HORIUCHI HIROSHI , KANO ISAMU
IPC分类号： F16F15/02 , F16F7/10
摘要： PURPOSE:To exhibit the suppressing effect of vibration by changing the value of a weight even in accordance with a variation in weight, by providing an arm and weight to a shaft which may be inclined to a vertical plane and to rotated, and by providing a damper between the arm and a stationary point. CONSTITUTION:A structure 1 to be subjected to suppression of vibration and a pendulum rotary shaft 10 are arranged, making an inclined angle therebetween, and a viscous damper 20 is arranged between pendulum arms 11, 11a suspending a weight 13 and an upper arm 3 as another stationary point. When the structure 1 is subjected to forced oscillation due to, for example, Karman vortices, this vibration is turned into the vibration of the pendulum of dynamic vibration reducer which is damped by the damper 20 as possible as it can. Further, when the natural frequency of the structure 1 varies, the natural frequency of the pendulum also varies if the inclined angle of the pendulum shaft 10 or the position of the weight 10 on the arms 11, 11a, so that it widely cope with various kind of vibration, and further, if the value W of the weight 1 is changed, this arrangement may cope with variations in the mass of the structure 1.

9. 发明专利

JPS5670307A VIBRATION PREVENTING METHOD OF PARALLEL BRIDGE 失效
公开(公告)号：JPS5670307A
公开(公告)日：1981-06-12
申请号：JP14542579
申请日：1979-11-12
申请人： NIPPON KOKAN KK
发明人： FUJISAWA NOBUMITSU , KITAGAWA KIICHI
IPC分类号： E01D1/00 , E01D19/00 , E01D19/02

10. 发明专利

JPH06136718A CABLE DAMPER 失效
公开(公告)号：JPH06136718A
公开(公告)日：1994-05-17
申请号：JP27489691
申请日：1991-09-27
申请人： NIPPON KOKAN KK
发明人： WADA HIROHISA , FUJISAWA NOBUMITSU , TAKEDA KATSUAKI , WATANABE NOBUO
IPC分类号： E01D1/00 , E01D11/00 , E01D11/04 , E01D19/16 , F16F15/04
摘要： PURPOSE:To control vibration of a cable to enhance damping performance by effecting almost only sharing force on the viscoelastic member of a cable stayed bridge with the vibration of the cable, and consuming vibration energy as heat. CONSTITUTION:An anchoring tube T to fix a cable C in no contact therewith is fixed to a stiffening column K. The anchoring tube T is extended up to a fovorable height for the vibration damping of the cable C along the cable C. A damper S is arranged between the anchoring tube T and the cable C near the free end of the anchoring tube T. At this time, a viscoelastic element G is connected between an inner flange F fixed to the cable C with a clamp P and an outer flange E welded to the anchoring tube T. When the cable C is vibrated in the arrow mark direction, the outer flange E and the inner flange F are mutually moved in a horizontal plane to give shearing deformation to the viscoelastic element G. It is thus possible to thermally convert vibration energy therefore to damp the cable C.

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