CN102865984A - Stayed-cable single-mode state transient excitation system - Google Patents
Stayed-cable single-mode state transient excitation system Download PDFInfo
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- CN102865984A CN102865984A CN201210398038XA CN201210398038A CN102865984A CN 102865984 A CN102865984 A CN 102865984A CN 201210398038X A CN201210398038X A CN 201210398038XA CN 201210398038 A CN201210398038 A CN 201210398038A CN 102865984 A CN102865984 A CN 102865984A
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Abstract
The invention provides a stayed-cable single-mode state transient excitation system which is characterized by comprising a frequency converter, a motor, an eccentric exciter, a tension sensor, a decoupling mechanism, an inhaul cable and a specially-made cable clamp. The motor is fixed on a bridge floor, the motor is connected with the frequency converter through a cable, the eccentric exciter is installed at an output shaft of the motor, and the eccentric exciter, the decoupling mechanism, the tension sensor and the specially-made cable clamp are connected in sequence through a steel wire rope. Frequency of the system is regulated to nearby some order of frequency of the inhaul cable through the frequency converter, and the inhaul cable is driven to perform forced vibration at some mode state through the action of a motor eccentric wheel. Excitation force time-history curve is measured in real time by the tension sensor of the system. The system is provided with a detacher, and the inhaul cable which is performing steady-state forced vibration can perform damped free vibration through sudden decoupling. In consideration of that free vibration of the inhaul cable has certain amplitude, the free vibration of the inhaul cable can be guaranteed, and safety of tests of the system can be guaranteed also through the preset lengthened steel wire rope after decoupling.
Description
Technical field
The present invention relates to drag-line bridge excitation system, be specifically related to a kind of suspension cable single mode transient excitation system.
Background technology
Suspension cable is the member of most critical in the cable-stayed bridge, but the Various Complex vibration easily occurs under natural conditions and bridge floor load action, thereby produces Cumulative Fatigue Damage, and the drag decay causes great harm to security and the permanance of cable-stayed bridge.Therefore how the vibration of establishment drag-line is focus and the difficult point of at present research.And the kinematic behavior of drag-line (vibration shape, frequency and damping ratio) research itself is the technology prerequisite of inhaul cable vibration control.Research inhaul cable vibration control measure and control effect often all need significantly inhaul cable vibration to check.
Therefore, study the technical matters for needing to be resolved hurrily of a kind of suspension cable single mode transient excitation system.
Summary of the invention
In order to remedy the research disappearance that has the effective excitation method of drag-line in the existing various vibration tests of suspension cable, the invention provides a kind of suspension cable single mode transient excitation system, both can guarantee the free vibration of drag-line, can guarantee again the safety of system test.
In order to realize above-mentioned technical purpose, technical scheme of the present invention is, a kind of suspension cable single mode transient excitation system, it is characterized in that comprise frequency converter, motor, eccentric activator, pulling force sensor, uncoupling rigging, drag-line and special cord clip, motor is fixed on bridge floor, motor connects frequency converter by cable, motor output shaft is equipped with eccentric activator, utilizes wire rope to connect successively eccentric activator, uncoupling rigging, pulling force sensor and special cord clip, and special cord clip is fixed on the drag-line.Special cord clip is the web member that makes things convenient for wire rope to be connected with drag-line, can be the web members such as the convenient any rope that connects, ring, folder.Motor also can not be fixed on bridge floor, can be arranged at any convenient place that arranges.Motor effect: power is provided, drives eccentric activator, make drag-line generation forced vibration; The frequency converter effect: control motor rotation speed (being frequency) makes forced vibration frequency approach certain single order natural frequency (theoretical value) of test drag-line; The eccentric wheel effect: by setting and the change of eccentric arm, control drag-line forced vibration amplitude size; Trigger (detacher) effect: in the forced vibration process, the people is for knocking the detacher spanner, and the sudden outburst exciting force makes drag-line produce own damped vibration; The pulling force sensor effect: Real-Time Monitoring forced vibration exciting force, for subsequent analysis provides inhaul cable vibration input energy datum; Cable effect: connect motor and frequency converter; Wire rope effect: connect motor eccentric wheel, detacher, pulling force sensor and drag-line, and bear exciting force; Motor is connected with bridge floor by expansion bolt, and the other end of wire rope is connected with drag-line by special cord clip.
The present invention is that also an end of drag-line is fixed on bridge floor, and drag-line becomes fixed angle with bridge floor.
The present invention is that also uncoupling rigging is trigger, and it is the lightweight end that uncoupling rigging has an end, is provided with the ball cone on the lightweight end, and the ball cone rear portion of uncoupling rigging lightweight end is with annular back stop slot.
The present invention is that also drag-line is connected with steel cord ends by special cord clip.
The present invention is that also special cord clip is the drag-line clasp.
The present invention is that also motor is fixed on bridge floor with expansion bolt, and eccentric activator is positioned at the drag-line horizontal plane.
The present invention also is, is provided with damper on the drag-line, and damper is detachable block.
The present invention also is, is provided with column between drag-line and the bridge floor, and column one end is connected on the bridge floor, and the other end of column connects the damper on the drag-line, and column is detachable block.
The present invention is that also the position that drag-line is provided with damper also is provided with dismountable accelerometer.
The present invention is that also the top of drag-line also is provided with a dismountable accelerometer.Characteristics of the present invention:
1, a kind of drag-line single mode steady stimulation network system realization is proposed
According to the calculated results of drag-line natural frequency, adjust frequency near certain fundamental frequency of drag-line by system's frequency converter, drive drag-line by the effect of motor eccentric wheel and carry out the forced vibration of a certain mode.Forced vibration is in order to realize single mode free vibration attenuation (after breaking off relations).
Simultaneously, by the pulling force sensor that system arranges, can measure in real time the exciting force time-history curves.Exciting force is in order to analyze: masterpiece is input, and the drag-line response is output.
2, realize drag-line single mode transient excite
By the detacher that system arranges, suddenly unhook can make the drag-line that carries out forcedstable oscillation carry out free vibration attenuation.
Consider that drag-line free vibration has certain amplitude, after system breaks off relations, by default lengthening wire rope, both can guarantee the free vibration of drag-line, can guarantee again the safety of system test.
Description of drawings
Fig. 1 is drag-line single mode exciting and test and the inhaul cable vibration composition of the control system schematic diagram of the suspension cable single mode transient excitation system of the embodiment of the invention.
Fig. 2 is the structured flowchart of the suspension cable single mode transient excitation system of the embodiment of the invention.
Fig. 3 is the structural representation of the suspension cable single mode transient excitation system of the embodiment of the invention.
Embodiment
Following embodiment is to the further specifying of the technology of the present invention content, but is not the restriction to flesh and blood of the present invention.
Referring to Fig. 1,2,3, a kind of suspension cable single mode of the present invention transient excitation system comprises frequency converter, motor, eccentric activator, pulling force sensor, uncoupling rigging, drag-line and special cord clip, motor is fixed on bridge floor, motor connects frequency converter by cable, motor output shaft is equipped with eccentric activator, utilize wire rope to connect successively eccentric activator, uncoupling rigging, pulling force sensor and special cord clip, special cord clip is fixed on the drag-line.
An end that also is drag-line is fixed on bridge floor, and drag-line becomes fixed angle with bridge floor.
Be that also uncoupling rigging is trigger, it is the lightweight end that uncoupling rigging has an end, is provided with the ball cone on the lightweight end, and the ball cone rear portion of uncoupling rigging lightweight end is with annular back stop slot.
Be that also drag-line is connected with steel cord ends by special cord clip.
Be that also special cord clip is the drag-line clasp.
Be that also motor is fixed on bridge floor with expansion bolt, and eccentric activator is positioned at the drag-line horizontal plane.
Also be, be provided with damper on the drag-line, damper is detachable block.
Also be, be provided with column between drag-line and the bridge floor, column one end is connected on the bridge floor, and the other end of column connects the damper on the drag-line, and column is detachable block.
Be that also the position that drag-line is provided with damper also is provided with dismountable accelerometer.
Be that also the top of drag-line also is provided with a dismountable accelerometer.
Fig. 1 is drag-line single mode exciting and test and the inhaul cable vibration composition of the control system schematic diagram of the suspension cable single mode transient excitation system of the embodiment of the invention, Fig. 2 is the structured flowchart of the suspension cable single mode transient excitation system of the embodiment of the invention, such as Fig. 1, shown in 2, suspension cable single mode transient excitation system comprises frequency converter, motor, eccentric activator, pulling force sensor, uncoupling rigging, drag-line and special cord clip, motor is fixed on bridge floor, motor connects frequency converter by cable, motor output shaft is equipped with eccentric activator, utilize wire rope to connect successively eccentric activator, uncoupling rigging, pulling force sensor, one end of drag-line is fixed on bridge floor, drag-line becomes fixed angle with bridge floor, uncoupling rigging is trigger, motor is fixed on bridge floor with expansion bolt, and eccentric activator is positioned at the drag-line horizontal plane, be provided with damper on the drag-line, be provided with column between drag-line and the bridge floor, column one end is connected on the bridge floor, the other end of column connects the damper on the drag-line, the position that drag-line is provided with damper also is provided with accelerometer, and the top of drag-line also is provided with an accelerometer.
Fig. 3 is the structural representation of the suspension cable single mode transient excitation system of the embodiment of the invention, as shown in Figure 3, suspension cable single mode transient excitation system comprises frequency converter 1, motor 2, eccentric activator 3, uncoupling rigging 4, pulling force sensor 5, drag-line 6 and special cord clip 7, motor 2 is fixed on bridge floor 8, motor 2 connects frequency converter 1 by cable, motor 2 output shafts are equipped with eccentric activator 3, utilize wire rope to connect successively eccentric activator 3, uncoupling rigging 4, pulling force sensor 5 and special cord clip 7, special cord clip 7 is fixed on the drag-line 6, one end of drag-line 6 is fixed on bridge floor 8,8 one-tenth fixed angles of drag-line 6 and bridge floor, uncoupling rigging 4 is trigger, it is the lightweight end that uncoupling rigging 4 has an end, be provided with the ball cone on the lightweight end, the ball cone rear portion of uncoupling rigging 4 lightweight ends is with annular back stop slot, drag-line 6 is connected with steel cord ends by special cord clip 7, special cord clip 7 is the drag-line clasp, motor 2 usefulness expansion bolts are fixed on bridge floor 8, and eccentric activator 3 is positioned at drag-line 6 horizontal planes, be provided with damper 10 on the drag-line 6, damper 10 is detachable block, be provided with column 9 between drag-line 6 and the bridge floor 8, column 9 one ends are connected on the bridge floor 8, the other end of column 9 connects the damper 10 on the drag-line 6, column 9 is detachable block, the position that drag-line 6 is provided with damper 10 also is provided with dismountable accelerometer 11, and the top of drag-line 6 also is provided with a dismountable accelerometer 11.
During enforcement, according to the calculated results of drag-line natural frequency, adjust frequency near certain fundamental frequency of drag-line by system's frequency converter, drive drag-line by the effect of motor eccentric wheel and carry out the forced vibration of a certain mode.Simultaneously, by the pulling force sensor that system arranges, can measure in real time the exciting force time-history curves.Exciting force is in order to analyze: masterpiece is input, and the drag-line response is output.By the detacher that system arranges, suddenly unhook can make the drag-line that carries out forcedstable oscillation carry out free vibration attenuation.Consider that drag-line free vibration has certain amplitude, after system breaks off relations, by default lengthening wire rope, both can guarantee the free vibration of drag-line, can guarantee again the safety of system test.
Claims (10)
1. suspension cable single mode transient excitation system, it is characterized in that, comprise frequency converter, motor, eccentric activator, pulling force sensor, uncoupling rigging, drag-line and special cord clip, motor is fixed on bridge floor, motor connects frequency converter by cable, motor output shaft is equipped with eccentric activator, utilizes wire rope to connect successively eccentric activator, uncoupling rigging, pulling force sensor and special cord clip, and special cord clip is fixed on the drag-line.
2. a kind of suspension cable single mode transient excitation according to claim 1 system is characterized in that an end of drag-line is fixed on bridge floor, and drag-line becomes fixed angle with bridge floor.
3. according to claim 1 or 2 described a kind of suspension cable single mode transient excitation systems, it is characterized in that uncoupling rigging is trigger, it is the lightweight end that uncoupling rigging has an end, be provided with the ball cone on the lightweight end, the ball cone rear portion of uncoupling rigging lightweight end is with annular back stop slot.
4. according to claim 1 or 2 described a kind of suspension cable single mode transient excitation systems, it is characterized in that drag-line is connected with steel cord ends by special cord clip.
5. a kind of suspension cable single mode transient excitation according to claim 4 system is characterized in that special cord clip is the drag-line clasp.
6. according to claim 1 or 2 described a kind of suspension cable single mode transient excitation systems, it is characterized in that motor is fixed on bridge floor with expansion bolt, and eccentric activator is positioned at the drag-line horizontal plane.
7. according to claim 1 or 2 described a kind of suspension cable single mode transient excitation systems, it is characterized in that be provided with damper on the drag-line, damper is detachable block.
8. a kind of suspension cable single mode transient excitation according to claim 7 system is characterized in that be provided with column between drag-line and the bridge floor, column one end is connected on the bridge floor, and the other end of column connects the damper on the drag-line, and column is detachable block.
9. a kind of suspension cable single mode transient excitation according to claim 8 system is characterized in that the position that drag-line is provided with damper also is provided with dismountable accelerometer.
10. according to claim 1 or 2 described a kind of suspension cable single mode transient excitation systems, it is characterized in that the top of drag-line also is provided with a dismountable accelerometer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210398038.XA CN102865984B (en) | 2012-10-18 | 2012-10-18 | A kind of stayed-cable single-mode state transient excitation system |
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| CN201210398038.XA CN102865984B (en) | 2012-10-18 | 2012-10-18 | A kind of stayed-cable single-mode state transient excitation system |
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| CN102865984A true CN102865984A (en) | 2013-01-09 |
| CN102865984B CN102865984B (en) | 2015-07-29 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103196645A (en) * | 2013-04-13 | 2013-07-10 | 郑州长发电子科技有限公司 | Bridge structure sudden damage stimulated device |
| CN103245473A (en) * | 2013-05-02 | 2013-08-14 | 东南大学 | Device for guy cable model vibration test |
| CN104658383A (en) * | 2015-02-25 | 2015-05-27 | 天津大学 | Stay cable parametrically excited vibration demonstrative experiment device and use method thereof |
| CN106289702A (en) * | 2016-08-10 | 2017-01-04 | 国家电网公司 | A kind of mechanical guide wire load discharges suddenly device and the method carrying out crossing frame impact experiment |
| CN110702350A (en) * | 2019-11-19 | 2020-01-17 | 中国交通建设股份有限公司 | Test device and test method for exciting integral vibration of suspension tunnel model |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103196645A (en) * | 2013-04-13 | 2013-07-10 | 郑州长发电子科技有限公司 | Bridge structure sudden damage stimulated device |
| CN103245473A (en) * | 2013-05-02 | 2013-08-14 | 东南大学 | Device for guy cable model vibration test |
| CN103245473B (en) * | 2013-05-02 | 2015-10-07 | 东南大学 | A kind of device for guy cable model vibration test |
| CN104658383A (en) * | 2015-02-25 | 2015-05-27 | 天津大学 | Stay cable parametrically excited vibration demonstrative experiment device and use method thereof |
| CN106289702A (en) * | 2016-08-10 | 2017-01-04 | 国家电网公司 | A kind of mechanical guide wire load discharges suddenly device and the method carrying out crossing frame impact experiment |
| CN110702350A (en) * | 2019-11-19 | 2020-01-17 | 中国交通建设股份有限公司 | Test device and test method for exciting integral vibration of suspension tunnel model |
| CN110702350B (en) * | 2019-11-19 | 2021-06-22 | 中国交通建设股份有限公司 | Test device and test method for exciting integral vibration of suspension tunnel model |
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| CN102865984B (en) | 2015-07-29 |
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