CN206804272U - A kind of device for bridge testing model force exciting - Google Patents
A kind of device for bridge testing model force exciting Download PDFInfo
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- CN206804272U CN206804272U CN201720676428.7U CN201720676428U CN206804272U CN 206804272 U CN206804272 U CN 206804272U CN 201720676428 U CN201720676428 U CN 201720676428U CN 206804272 U CN206804272 U CN 206804272U
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Abstract
The utility model provides a kind of device for bridge testing model force exciting, the both ends of the test model length direction are respectively provided with model support, force cell is folded between test model and corresponding model support, and the hydraulic jack that a piston rod can pump is each provided with below the corner of test model, the piston rod part of four hydraulic jacks is respectively connected with the top movable bearing that top is connected with model support, two hydraulic jack synchronization telescopes and bottom below the root long sideline of test model one are respectively connected with a bottom hold-down support being fixedly connected with experimental rig basis, also synchronization telescope and bottom are respectively connected with a lower removable bearing being fixedly connected with experimental rig basis to two hydraulic jacks below another root long sideline, described device also includes displacement transducer and acceleration transducer.The utility model can simulate vertical and reverse the forced vibration of single-degree-of-freedom or coupling in both direction, and data are more accurate, and excited frequency is high.
Description
Technical field
Wind tunnel test field is the utility model is related to, especially, is related to and a kind of bridge testing model is carried out to force exciting
Device.
Background technology
World today's traffic fast development, bridge cross over Jiang Hai and valley by more and more, and the high wind in these regions is to bridge
Effect can not be ignored caused by beam.Increasing with the span of bridge, its flexibility will also increase, and aeroelasticity effect will be right
The vibration of structure produces the influence that can not ignore.
In order to understand even pneumatic influence of the feedback effect to bridge of wind load, we are more to be surveyed by wind tunnel test
Examination, obtain aerodynamic force and aerodynamic parameter of the bridge in wind field.And the method for currently acquired aerodynamic parameter mainly has certainly at present
By vibratory drilling method, forced oscillation method, random vibration method.
But the aerodynamic parameter that free vibration method is identified has larger difference with aerodynamic parameter during practical structures wind-induced vibration；
Although random vibration method is consistent with the form of practical structures wind-induced vibration, it is restricted by recognition methods, and precision is not ideal enough；
Forced vibration device employed in existing conventional forced oscillation method mainly produces what the parameters such as amplitude and frequency were previously set
Single-frequency simple harmonic quantity forced vibration, and the device is motor-driven, is adapted to the Vortex-excited vibration state of model configuration and soft flutter shape
State, but the state of random vibration (buffeting) and different flutter divergent states can not be simulated, and measuring accuracy and excited frequency
Not high, mechanism is complicated.
Paper《The Three Degree Of Freedom forced oscillation method of Bridge Sections aerodynamic derivative identification》In describe a kind of Segment Model three
Degree-of-freedom Coupling forced vibration device, the device is to drive amplitude regulating structure to rotate by motor oscillating, and amplitude adjustment knot
Structure constructs for crank connecting link, therefore can be simple harmonic quantity straight reciprocating motion by the convert rotational motion of drive shaft.The device is distinguished
Three vibration circuits are set to realize horizontal, vertical and torsional direction single-degree of freedom vibration either two-freedom, three freely
The resultant vibration of degree.Although the device can realize the coupling of highest Three Degree Of Freedom, the motion composite structure of the device compares
Complexity, it is unfavorable for controlling, therefore the data precision measured is not high, and also mechanical mechanism is difficult to obtain higher exciting frequency
Rate.
Utility model content
The utility model purpose is to provide a kind of device for bridge testing model force exciting, to solve in wind
It is existing in the experiment of hole to force the technical problem that the aerodynamic parameter measurement accuracy of excitation method is not high, excited frequency is not high.
To achieve the above object, a kind of device for bridge testing model force exciting of the present utility model, it is described
The both ends of test model length direction are respectively provided with a model support for being used to support test model, and test model length direction
End face be arranged at being folded with force cell, the circular flat of force cell between corresponding model support in vertical plane,
And the liquid that a piston rod can pump is each provided with below the corner in the test model length and width direction
Compressing cylinder, the piston rod part of four hydraulic jacks are respectively connected with a top movable bearing, and the top of top movable bearing is equal
It is fixedly connected with model support, the bottom of two hydraulic jacks below the root long sideline of test model one is respectively connected with one
Bottom hold-down support, and the bottom of two hydraulic jacks below another root long sideline of test model is respectively connected with one
The bottom of portion's movable bearing support, bottom hold-down support and lower removable bearing is fixedly connected with experimental rig basis, positioned at experiment
Two hydraulic jacks below any one root long sideline of model are disposed as synchronization telescope, four hydraulic jacks and six activity branch
The setting of seat allows test model to be rotated using its certain length direction line as axis and allow test model on the whole
Lower translation, it is described that bridge testing model is carried out to force the device of exciting also to include being used to detect piston rod in real time and stretch to cause examination
Test at least two displacement transducers of the upper and lower displacement that the both sides in model width direction occur respectively and stretched for detecting piston rod
At least two acceleration transducers of contracting acceleration.
The utility model only promotes bearing to do the axial movement can of vertical direction and simulates bridge knot by hydraulic jack
Random Coupling of the structure in single-degree-of-freedom random vibration either two-freedom direction that is vertical and reversing both direction vibrates, and can
Wind tunnel test is carried out under this operating mode, measures self-excitation aerodynamic parameter；Higher exciting frequency can be reached using hydraulic jack simultaneously
Rate, so as to obtain more perfect test data.
Especially, the movable bearing support includes the connected block of the connected block in top and bottom, and the lower surface of the connected block in top is set
Cylinder is set to, bottom is connected in block to be provided with is arranged on the groove for the movable groove of the cylinder, the cylinder
Interior, the direction of motion of the movable bearing support is consistent with the direction of rotation of coupled test model.Movable bearing support is set, can be with
So that test model will not be caused test model not to be destroyed during rotation by destroying during experiment.
Especially, in addition to computer, electrohydraulic servo valve, servo controller and data acquisition unit, the electrohydraulic servo valve
It is connected with hydraulic jack, the servo controller both ends connect computer and electrohydraulic servo valve respectively, and computer receives displacement biography
It is compared after sensor and acceleration transducer feedack with default displacement and acceleration magnitude, and indicates servo controller
The amount of exercise of piston rod in hydraulic jack is controlled with electrohydraulic servo valve, the data acquisition unit connects with force cell and computer
Connect the data acquisition for force cell to be measured and real-time delivery is to computer.
Especially, the electrohydraulic servo valve is four and is connected with same servo controller.
Especially, in addition to for providing the motor and high-pressure oil pump of driving force for hydraulic jack, and for for electricity
The cooler of motivation cooling.
Especially, the force cell is two and is separately positioned on the both ends of test model length direction, and described
Force cell is six component high-frequency color Dopplers.
Especially, multiple bearing fixing grooves are provided with the basis of the experimental rig for being installed in different fixing grooves
Bottom hold-down support and lower removable bearing and cause device adapt to different size of test model.
The utility model has the advantages that：
A kind of device for bridge testing model force exciting of the present utility model, branch is only promoted by hydraulic jack
Seat motion can simulation bridge structure single-degree-of-freedom upper frequency that is vertical and reversing both direction random vibration or
It is the Random Coupling vibration of two-freedom direction upper frequency, and wind tunnel test can be carried out under this operating mode, it is pneumatic measures self-excitation
Force parameter；The utility model is suitable for various sizes of test structure by adjusting bearing in the position on experimental rig basis.
The utility model after the vibration parameters needed for user's input, servo controller can automatic identification, and output signal
In hydraulic jack, it is set to produce the forced vibration of corresponding vibration parameters, and closed loop feedback is realized by adjuster so that result is more
Accurately.
In addition to objects, features and advantages described above, the utility model also has other purposes, feature and excellent
Point.Below with reference to figure, the utility model is described in further detail.
Brief description of the drawings
The accompanying drawing for forming the part of the application is used for providing further understanding to of the present utility model, of the present utility model
Schematic description and description is used to explain the utility model, does not form to improper restriction of the present utility model.In accompanying drawing
In：
Fig. 1 is device positive structure schematic in embodiment 1；
Fig. 2 is device side structure schematic diagram in embodiment 1；
Fig. 3 is device overlooking the structure diagram in embodiment 1；
Fig. 4 is device basic overlooking the structure diagram in embodiment 1；
Description of reference numerals：
1st, cooler, 2, motor, 3, high-pressure oil pump, 4, servo controller, 5, electrohydraulic servo valve, 6, hydraulic jack, 7,
Displacement transducer, 8, acceleration transducer, 9, force cell, 10, data acquisition unit, 11, computer, 12, model support,
13rd, top movable bearing, 14, bottom hold-down support, 15, lower removable bearing, 16, experimental rig basis, 01, test model.
Embodiment
Embodiment of the present utility model is described in detail below in conjunction with accompanying drawing, but the utility model can be according to power
Profit requires to limit and the multitude of different ways of covering is implemented.
As shown in Figure 1 to 4, a kind of device for bridge testing model force exciting, the test model 01 are grown
The both ends in degree direction are respectively provided with one and are used to supporting the model support 12 of test model, and the end face of the length direction of test model 01 with
Force cell 9 is folded between corresponding model support 12, the circular flat of force cell 9 is arranged in vertical plane, described
Force cell 9 is two and is separately positioned on the both ends of test model length direction, and the force cell 9 is six components
Force balance, the force cell are bolted with the model support and the test model respectively.
Being each provided with a piston rod below the corner in the length and width direction of test model 01 can be up and down reciprocatingly
The hydraulic jack 6 of motion, the piston rod part of four hydraulic jacks are respectively connected with a top movable bearing 13, top movable branch
The top of seat is fixedly connected with model support 12, the bottom of two hydraulic jacks below the root long sideline of test model one
A bottom hold-down support 14 is respectively connected with, and is located at the bottom of two hydraulic jacks below another root long sideline of test model
A lower removable bearing 15 is respectively connected with, wherein, the bottom of bottom hold-down support and lower removable bearing is and experimental rig
Basis 16 is fixedly connected, and multiple bearing fixing grooves are provided with the experimental rig basis 16 for pacifying in different fixing grooves
Load portion's hold-down support 14 and lower removable bearing 15 and so that device adapts to different size of test model 01.
Two hydraulic jacks below any one root long sideline of test model 01 are disposed as synchronization telescope, four liquid
The setting of compressing cylinder and six movable bearing supports allow test model using its certain length direction line as axis vertically rotation and
Allow the overall upper and lower translation of test model.
The movable bearing support includes the connected block of the connected block in top and bottom, and the lower end of the connected block in top is arranged to cylinder
Body, bottom are connected in block to be provided with and are arranged on for the movable groove of the cylinder, the cylinder in the groove, the work
The direction of motion of dynamic bearing with and its connected test model direction of rotation it is consistent so that test model in rotary course not
It can be destroyed.
It is described that bridge testing model is carried out to force the device of exciting also to include being used to detect piston rod in real time and stretch to cause
At least two displacement transducers 7 of the upper and lower displacement that the both sides of test model width occur respectively and for detecting piston rod
At least two acceleration transducers 8 of flexible acceleration.
It is described force the device of exciting also to include computer 11, electrohydraulic servo valve 5, servo control on bridge testing model
Device 4 and data acquisition unit 10 processed, the electrohydraulic servo valve 5 are connected with hydraulic jack 6, and the electrohydraulic servo valve 5 is for four and equal
It is connected with same servo controller 4, the both ends of servo controller 4 connect computer 11 and electrohydraulic servo valve 5 respectively, calculate
Machine is compared after receiving displacement transducer 7 and the feedack of acceleration transducer 8 with default displacement and acceleration magnitude, and
Indicate that servo controller 4 and electrohydraulic servo valve 5 control the amount of exercise of piston rod in hydraulic jack 6 to cause what piston rod finally moved
Displacement and acceleration are consistent with preset value, and the data acquisition unit 10 is connected to survey with force cell 9 and computer 11
The data acquisition and real-time delivery that force snesor 9 measures to computer and record the displacement finally moved when piston rod and acceleration
With the preset value data that force cell measures when consistent.
It is described that bridge testing model is carried out to force the device of exciting also to include being used to provide driving force for hydraulic jack 6
Motor 2 and high-pressure oil pump 3, and the cooler 1 for cooling for motor.
1. during aerodynamic parameter when test model only vertical direction random vibration need to be measured, set by control system
The vertical displacement parameter of test model, and the axial stroke and acceleration of four hydraulic jacks are converted to by geometrical relationship,
It now should ensure that the stroke of four hydraulic jacks is consistent with acceleration, then instruction produced by control system, instruction hydraulic power source carries
Electro-hydraulic loading device is set to work according to demand for power；And regulation in time and the displacement of feedback hydraulic oil cylinder and acceleration, until
Hydraulic jack obtains the acceleration consistent with setting and displacement.
2. during aerodynamic parameter when test model only torsional direction random vibration need to be measured, due to the torsion angle of model
=difference in height/horizontal range, and because only measure torsional direction, so when two force cells should be respectively placed in experiment
The center point of model short brink, and the displacement that this central point should be vertical in test model vibration processes should keep constant,
Therefore need to set the different vertical displacement parameter of test model both sides hydraulic jack by control system, and should be side liter
Height, opposite side are reduced, and rise is consistent with the displacement reduced, then the axial row of four hydraulic jacks is converted to by geometrical relationship
Journey and acceleration, and instruction is produced by control system, instruction hydraulic power source, which provides power, makes electro-hydraulic loading device according to demand
Work；And regulation in time and the displacement of feedback hydraulic oil cylinder and acceleration, until hydraulic jack obtains the acceleration consistent with setting
Degree and displacement.
3. during aerodynamic parameter when test model vertical and torsional direction random vibration need to be measured, due to the torsion of model
Corner=difference in height/horizontal range, it is therefore desirable to which hydraulic jack different vertical in test model both sides is set by control system
Displacement parameter, and the existing vertical displacement of test model of force cell lay down location should be caused, there is torsional displacement again, then by several
What relation is converted to the axial stroke and acceleration of four hydraulic jacks, and produces instruction by control system, instructs hydraulic pressure
Source, which provides power, makes electro-hydraulic loading device work according to demand；And regulation in time and the displacement of feedback hydraulic oil cylinder and acceleration,
Until hydraulic jack obtains the acceleration consistent with setting and displacement.
Preferred embodiment of the present utility model is the foregoing is only, is not limited to the utility model, for this
For the technical staff in field, the utility model can have various modifications and variations.It is all in the spirit and principles of the utility model
Within, any modification, equivalent substitution and improvements made etc., it should be included within the scope of protection of the utility model.
Claims (7)
- A kind of 1. device for bridge testing model force exciting, it is characterised in that test model (01) the length side To both ends be respectively provided with one and be used to supporting the model support (12) of test model, and the end face of test model (01) length direction with Force cell (9) is folded between corresponding model support (12), the circular flat of force cell (9) is arranged at vertical plane It is interior, and be each provided with a piston rod below the corner in the test model (01) length and width direction and can up and down reciprocatingly transport Dynamic hydraulic jack (6), the piston rod part of four hydraulic jacks are respectively connected with a top movable bearing (13), top movable The top of bearing is fixedly connected with model support (12), two hydraulic jacks below the root long sideline of test model one Bottom is respectively connected with a bottom hold-down support (14), and is located at two hydraulic jacks below another root long sideline of test model Bottom be respectively connected with a lower removable bearing (15), the bottom of bottom hold-down support and lower removable bearing fills with experiment Put basic (16) to be fixedly connected, two hydraulic jacks below any one root long sideline of test model (01) are disposed as together Step is flexible, and the setting of four hydraulic jacks and six movable bearing supports allows test model using its certain length direction line as axle Line rotates and allows the overall upper and lower translation of test model, described force the device of exciting also to wrap on bridge testing model Include for detect in real time piston rod it is flexible so that the upper and lower displacement that the both sides of test model width occur respectively at least two Individual displacement transducer (7) and at least two acceleration transducers (8) for detecting the flexible acceleration of piston rod.
- 2. the device according to claim 1 for bridge testing model force exciting, it is characterised in that the activity Bearing includes the connected block of the connected block in top and bottom, and the lower surface of the connected block in top is arranged to cylinder, and bottom is connected in block The groove for cylinder activity is provided with, the cylinder is arranged in the groove, the motion side of the movable bearing support To consistent with the direction of rotation of coupled test model so that test model will not be destroyed during rotation.
- 3. the device according to claim 1 for bridge testing model force exciting, it is characterised in that also include meter Calculation machine (11), electrohydraulic servo valve (5), servo controller (4) and data acquisition unit (10), the electrohydraulic servo valve (5) and hydraulic pressure Oil cylinder (6) connects, and servo controller (4) both ends connect computer (11) and electrohydraulic servo valve (5) respectively, and computer receives It is compared, and refers to default displacement and acceleration magnitude after displacement transducer (7) and acceleration transducer (8) feedack Show the amount of exercise of piston rod in servo controller (4) and electrohydraulic servo valve (5) control hydraulic jack (6), the data acquisition unit (10) data acquisition that measures force cell (9) is connected to force cell (9) and computer (11) and is passed in real time Pass computer.
- 4. the device according to claim 3 for bridge testing model force exciting, the electrohydraulic servo valve (5) are Four and it is connected with same servo controller (4).
- 5. the device for bridge testing model force exciting according to any one in Claims 1 to 4, its feature It is, in addition to for providing the motor (2) and high-pressure oil pump (3) of driving force for hydraulic jack (6), and for be electronic The cooler (1) of machine cooling.
- 6. the device for bridge testing model force exciting according to any one in Claims 1 to 4, its feature It is, the force cell (9) is two and is separately positioned on the both ends of test model length direction, and the force-measuring sensing Device (9) is six component high-frequency color Dopplers.
- 7. the device for bridge testing model force exciting according to any one in Claims 1 to 4, its feature It is, multiple bearing fixing grooves is provided with the experimental rig basic (16) and are consolidated for installing bottom in different fixing grooves Determine bearing (14) and lower removable bearing (15) and so that device adapts to different size of test model (01).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720676428.7U CN206804272U (en) | 2017-06-12 | 2017-06-12 | A kind of device for bridge testing model force exciting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720676428.7U CN206804272U (en) | 2017-06-12 | 2017-06-12 | A kind of device for bridge testing model force exciting |
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| Publication Number | Publication Date |
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| CN206804272U true CN206804272U (en) | 2017-12-26 |
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| CN201720676428.7U Expired - Fee Related CN206804272U (en) | 2017-06-12 | 2017-06-12 | A kind of device for bridge testing model force exciting |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107063625A (en) * | 2017-06-12 | 2017-08-18 | 中南大学 | A kind of device for bridge testing model force exciting |
-
2017
- 2017-06-12 CN CN201720676428.7U patent/CN206804272U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107063625A (en) * | 2017-06-12 | 2017-08-18 | 中南大学 | A kind of device for bridge testing model force exciting |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171226 Termination date: 20210612 |
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| CF01 | Termination of patent right due to non-payment of annual fee |