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1. 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.

2. 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.

3. 发明专利

JPH04216418A AIR COLUMN RESONATING-TYPE DOUBLE TUBE LIQUID LEVEL METER AND LIQUID LEVEL MEASURING METHOD 失效
公开(公告)号：JPH04216418A
公开(公告)日：1992-08-06
申请号：JP41130090
申请日：1990-12-18
申请人： NIPPON KOKAN KK
发明人： NAKAMURA NOBUHIDE , FUJISAWA NOBUMITSU , SONOBE YOSHIHIRO
IPC分类号： G01B17/00 , G01F23/28
摘要： PURPOSE:To obtain an air column resonating-type liquid level meter capable of obtaining the length of an air column without taking the degree and the sound velocity into consideration and a measuring method using the liquid level meter, by introducing sound waves from a sound wave oscillator to two liquid level tubes having different lengths of air columns. CONSTITUTION:The sound waves from a sound wave oscillator are introduced into two liquid level tubes communicating to each other and having different lengths of air columns. The length of an air column L or L' is obtained in accordance with a formula below from the difference D of the lengths of two air columns, resonant frequencies fn, fn' adjacent to each other and (dn) of the resonant frequencies, thereby obtaining the liquid level of each liquid level tube. The liquid level is measured in the above manner. L=D.fn/dn, L'=D.fa'/d.

4. 发明专利

JPH03154828A AIR COLUMN RESONANCE TYPE COMMUNICATING TUBE WATER GAGE AND ITS WATER LEVEL MEASURING METHOD 失效
公开(公告)号：JPH03154828A
公开(公告)日：1991-07-02
申请号：JP29383689
申请日：1989-11-14
申请人： NIPPON KOKAN KK
发明人： FUJISAWA NOBUMITSU , SONOBE YOSHIHIRO
IPC分类号： G01F23/28
摘要： PURPOSE:To improve the measurement accuracy by providing a sound wave oscillator which sweeps the frequency range of the audio range and a sound wave detector which detects a resonant sound wave in the air column part in a water level tube at the upper end part in the water level tube. CONSTITUTION:A measuring instrument 3 which is equipped integrally with an amplifier and temperature sensor including a microphone, a speaker, and a rectifying circuit is arranged at the upper end part of the water level tube 1, which communicates with a conduit 2 at its lower end part and contains water 5, almost in a sealed state through an O ring made of rubber. Thus, the measuring instrument 3 is arranged at the upper end part of the water level tube 1 to eliminate the need for tube end correction and a sound wave in the audio range is used, to the attenuation in air is reduced and an operator can hear the resonant sound, thereby reducing artificial failures in measurement. Further, the sound wave oscillator and a sound wave detector are sealed and arranged to reduce the influence of ambient noises, thereby obtaining a high- accuracy measured value.

5. 发明专利

JPH04216417A AIR COLUMN RESONATING-TYPE LIQUID LEVEL GAUGE AND LIQUID LEVEL MEASURING METHOD 失效
公开(公告)号：JPH04216417A
公开(公告)日：1992-08-06
申请号：JP41129990
申请日：1990-12-18
申请人： NIPPON KOKAN KK
发明人： NAKAMURA NOBUHIDE , SONOBE YOSHIHIRO , FUJISAWA NOBUMITSU
IPC分类号： G01F23/28
摘要： PURPOSE:To obtain a liquid level gauge of high measuring accuracy to measure the liquid level in a liquid level tube of a communicating vessel and a liquid level measuring method by the liquid level gauge, by generating random noises into the liquid level tube and obtaining the length of an air column based on the resonant frequencies of the noises. CONSTITUTION:When the random noises are input from a sound wave oscillator to a liquid level tube, the noises are detected and analyzed to spectrum. As a result, the n-degree and m-degree resonant frequencies are obtained. The length of an air column is obtained according to a formula [L=(n-m)c/2{fn-fm)}] using the sound velocity (c), the degrees of the resonance of the resonant frequencies and the difference of the frequencies. In this manner, the liquid level in the liquid level tube is obtained (nnot equal to m).

6. 发明专利

JPH04198506A DAMPING METHOD FOR AERODYNAMIC VIBRATION OF STRUCTURE 失效
公开(公告)号：JPH04198506A
公开(公告)日：1992-07-17
申请号：JP32606990
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 control aerodynamic vibration of main girder by a method in which nozzles are set at a given interval in the span direction on the corners of box-like main girder for bridge and air is jetted in a fanshaped form from the nozzles to form air stream toward the widthwise direction of the main girder. CONSTITUTION:Nozzles 20 are set at a given interval in the span direction on the corners of a main girder 2. Air is jetted in a fan-shaped form from the ports 20a of the nozzles 20 to form a fan-shaped air stream toward the widthwise direction of the main girder 2, where the air stream 21 is formed intermittently to the span direction (X-direction) due to the presence of the nozzles 20 at a given interval in the span direction of the main girder 20. In this case, a portion where the downflow rates are differently occurred in the direction of Y of swirl produced on the main girder is formed intermittently, whereby avoiding the occurrence of vibration to the direction of Z in the main girder 2. Also, the downflow rate of the swirl are varied to prevent resonance of the nonsteady air force and vibration. Air vibration can thus be controlled.

7. 发明专利

JPH03137511A DOUBLE TUBE TYPE COMMUNICATION PIPE 失效
公开(公告)号：JPH03137511A
公开(公告)日：1991-06-12
申请号：JP27495089
申请日：1989-10-24
申请人： NIPPON KOKAN KK
发明人： FUJISAWA NOBUMITSU , SONOBE YOSHIHIRO
IPC分类号： G01C5/04
摘要： PURPOSE:To improve precision in measurement by a construction wherein airtight chambers are formed in the upper end parts of a plurality of water level pipes respectively and a pressure conduction pipe for keeping the inside of each airtight chamber under an equal pressure is connected to each water level pipe. CONSTITUTION:Water level pipes 1 are provided at several measuring places of a bridge 7, for instance, and the lower end parts of the pipes 1 are made to communicate with each other by a conduit pipe 2. The upper end parts of the water level pipes 1 are hermetically sealed to form airtight chambers respectively and a pressure conduction pipe 4 is made to communicate with the respective airtight chambers 3 of the water level pipes 1. The pressure conduction pipe 4 connects the airtight chambers 3 one another in the upper parts of all the water level pipes 1 constituting a communication pipe and an air pressure in each water level pipe 1 constitutes a same air chamber 5. Besides, a valve 6 for making the air pressure inside the air chamber 5 open to the atmospheric pressure is provided. Even when the water level in each water level pipe 1 fluctuates due to displacement or deformation at the relevant measuring place, the volume of the water and air in the water level pipes 1, the conduit pipe 2 and the pressure conduction pipe 4 constituting the communication pipe is invariable. When the air chamber 5 is not opened by the valve 6, therefore, no change of the air pressure in each water level pipe 1 occurs even with the displacement at the measuring place and thus an accurate measurement of a water level is enabled.

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