CN213068131U - Elastic suspension system for wind tunnel experiment of bridge segment model - Google Patents
Elastic suspension system for wind tunnel experiment of bridge segment model Download PDFInfo
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- CN213068131U CN213068131U CN202021995712.9U CN202021995712U CN213068131U CN 213068131 U CN213068131 U CN 213068131U CN 202021995712 U CN202021995712 U CN 202021995712U CN 213068131 U CN213068131 U CN 213068131U
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Abstract
The utility model provides a bridge segment model wind-tunnel experiment elasticity suspension, including rigidity segment model, rigidity segment model both sides are provided with suspension, and every suspension includes the rigid frame of supporting that the longitudinal symmetry set up and is located the rigid support connecting rod between two rigid frames of supporting, the rigid support connecting rod links to each other with the rigid frame through the spring of three group longitudinal symmetries, and three group's springs are limit spring, central spring and limit spring from the front to the back in proper order. This device simple structure, reasonable in design through the rigidity of adjusting limit spring, center spring, realizes the effective regulation of limit spring davit length, avoids partial model to increase the problem of experimental error and the experiment degree of difficulty because of davit length is short excessively, especially has showing the advantage to the girder segment model that the frequency of turning round is littleer.
Description
Technical Field
The utility model relates to a bridge segment model wind-tunnel experiment elastic suspension system.
Background
As shown in fig. 2, at present, a two-dimensional segmental model wind tunnel experiment is generally adopted to inspect flutter and vortex-induced vibration of a bridge structure. The two-dimensional segment model is a rigid body model, is arranged in the wind tunnel through an elastic suspension system consisting of a spring and a supporting device, and can generate two-degree-of-freedom motion of vertical translation and rotation around the torsional center of the segment model. The spring device provides vertical bending stiffness and torsional stiffness for the segment model, the vertical bending vibration frequency of the model is determined by the spring stiffness, and the torsional vibration frequency is determined by the spring stiffness and the length of the force arm. When the section model vibration measurement experiment is carried out, the main vibration modes, the corresponding frequencies and the equivalent masses of the bridge under different working conditions are calculated according to a finite element program, wherein the main vibration modes comprise vertical bending frequenciesf v And torsional frequencyf t And equivalent massm eq And equivalent mass moment of inertiaJ meq ,Converting into corresponding data of the model by adopting a proper scale ratio through a formula
Calculating the vertical bending stiffness and the torsional stiffness required by the model, wherein m is the equivalent mass or the inertia moment of the equivalent mass obtained by conversion,fvertical bending or torsional frequencies. And the vertical bending stiffness obtained by calculation is the sum of the spring stiffness, so that the stiffness of four pairs of springs in the elastic suspension system is determined. And the torsional rigidity is the product of the spring rigidity and the distance between the spring and the torsional center of the two-dimensional segment model, namely the length of the suspension arm, so that the length of the suspension arm of the elastic suspension system is determined. When the vertical bending stiffness of the section model in the suspension system obtained by calculation is far greater than the torsional stiffness, the vertical bending stiffness is determined by the spring stiffness, and the torsional stiffness is determined by the product of the spring stiffness and the length of the suspension arm, so that the conventional elastic suspension system only adoptsThe length of the short suspension arm can meet the requirement of the segment model on the torsional rigidity, and the length of the suspension arm cannot be effectively adjusted by adjusting the rigidity of the spring, so that the problems that the length of the suspension arm is too short, and the experimental error and the experimental difficulty are increased are caused.
SUMMERY OF THE UTILITY MODEL
The utility model discloses improve above-mentioned problem, promptly the utility model discloses a technical problem that solves provides a modified bridge segment section model wind-tunnel experiment elasticity suspension, and the elasticity suspension after the improvement has add central spring, realizes the effective regulation of limit spring davit length through the rigidity of adjusting central spring and limit spring, avoids partial model to increase the problem of the experimental error and the experiment degree of difficulty because of davit length weak point.
The utility model discloses a concrete implementation scheme is: the elastic suspension system comprises rigid section models, suspension systems are arranged on two sides of each rigid section model, each suspension system comprises a pair of rigid support frames which are arranged in an up-down symmetrical mode and rigid support connecting rods which are arranged between the two rigid support frames, each rigid support connecting rod is connected with the rigid support frame through three groups of springs which are arranged in an up-down symmetrical mode, and the three groups of springs are respectively an edge spring, a central spring and an edge spring from front to back in sequence.
Further, the distance between the central spring and the side spring on the rigid support connecting rod is the length of the suspension arm.
Further, the central spring is positioned in the center of the support connecting rod and passes through the torsional center of the two-dimensional segmental model, and the two side springs are symmetrically arranged by taking the central spring as the center.
Further, the rigid support connecting rods are fixed on two sides of the rigid segment model, and two ends of the rigid segment model are provided with two-element end plates.
Furthermore, a sensor is arranged at the end part of the rigid supporting connecting rod and used for recording a displacement time-course curve or an acceleration time-course curve of the model vibration.
Compared with the prior art, the utility model discloses following beneficial effect has: the device is simple in structure and reasonable in design, when a two-dimensional section model vibration measurement wind tunnel experiment is carried out, main vibration modes and frequencies of a bridge under different working conditions are obtained according to finite element programs, when the torsional frequency of a main beam is far smaller than the vertical bending frequency, main vertical bending rigidity is provided for the model through a newly-added central spring, the rigidity of 4 opposite side springs is reduced to increase the length of the suspension arm, the requirements of the section model on the rigidity are met, the side springs can be adjusted to reasonable positions, the problems that the existing elastic suspension system only adopts a short length of the suspension arm to meet the requirements of the model on the vertical bending rigidity and the torsional rigidity simultaneously, the length of the suspension arm cannot be effectively adjusted through adjusting the rigidity of the springs, and the experiment error and the experiment difficulty are increased due to the fact that the length of the suspension arm is too short are solved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a diagram of a prior art bridge section model test elastomeric suspension system configuration;
in the figure: 1-rigid support connecting rod, 2-rigid support frame, 3-rigid segment model, 4-side spring, 5-center spring, 6-boom length, 7-binary end plate and 8-sensor.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example (b): as shown in fig. 1, the elastic suspension system for the wind tunnel experiment of the bridge segment model comprises a rigid segment model 3 of a bridge girder, suspension systems are arranged on two sides of the rigid segment model, each suspension system comprises a rigid support frame 2 and a rigid support connecting rod 1, the rigid support frame 2 is arranged in an up-down symmetrical mode, the rigid support connecting rods are located between the two rigid support frames, the rigid support connecting rods are connected with the rigid segment model, each rigid support connecting rod is respectively connected with the rigid support frame located above and below through three pairs of springs which are arranged in an up-down symmetrical mode, and the three groups of springs are an edge spring 4, a central spring 5 and an edge spring 4 in.
In the embodiment, in a wind tunnel experiment of a bridge segment model, a rigid segment model is suspended in a wind tunnel through elastic suspension systems on two sides, a supporting rigid frame positioned above is fixed on the top surface of the wind tunnel, a supporting rigid frame positioned below is fixed on the bottom surface of the wind tunnel, and the rigid segment model and a rigid supporting connecting rod form a rigid system; the elastic suspension system is used for suspending and connecting the rigid segment model on the rigid support frame through 4 pairs of side springs and 2 pairs of central springs so as to provide vertical stiffness and torsional stiffness for the system; the rigid segment model is fixed with a rigid supporting connecting rod, and two ends of the rigid segment model are provided with binary end plates which can do two-degree-of-freedom motion of vertical translation and rotation around the torsional center of the segment model.
In this embodiment, the distance between the center spring and the side spring on the rigid support link is the boom length 6.
In this embodiment, the central spring is located in the middle of the support link and passes through the torsional center of the rigid segment model, and the side springs are symmetrically arranged with the central spring as the center.
In this embodiment, the rigid support links are fixed on both sides of the rigid segment model, and the two ends of the rigid segment model are provided with the two-dimensional end plates 7.
In this embodiment, a sensor 8 is disposed on an end of the rigid support link, and is configured to record a displacement time-course curve or an acceleration time-course curve of the model vibration, and obtain the flutter and vortex-induced vibration performance of the bridge through analysis.
In this embodiment, in the process of performing the vibration measurement experiment of the bridge section model, according to the vibration frequency of each order of vibration mode in the bridge formation state obtained by finite element software, when the calculated vertical bending vibration stiffness of the bridge to be measured is much greater than the torsional vibration stiffness, because the vertical bending vibration stiffness of the rigid bridge section model is determined by the spring stiffness, and the torsional vibration stiffness is determined by the product of the spring stiffness and the boom length, if the existing bridge section model experiment elastic suspension system is adopted, under the condition of satisfying the vertical bending stiffness of the model, the requirement of the torsional stiffness can be satisfied only by adopting a shorter boom length, the boom length cannot be effectively adjusted by adjusting the spring stiffness, and the experiment error and the experiment difficulty are increased if the boom length is too short. The utility model discloses increased 2 to (4) the central spring through rigidity festival section model torsional center position, the newly-increased central spring of accessible provides mainly perpendicular curved rigidity for rigidity festival section model, make the model when satisfying perpendicular curved rigidity, the mode through reducing 8 limit spring rates reduces the torsional rigidity of system, when satisfying the model and to the rigidity requirement, make the limit spring can effectively adjust reasonable position, be favorable to going on smoothly of experiment operation, reduce the error that produces in the experiment.
In this embodiment, the side spring stiffness, the center spring stiffness, and the boom length may be determined as follows. The calculation of the vertical bending stiffness and the torsional stiffness of a two-dimensional segment model in the improved elastic suspension system is the same as that of the traditional elastic suspension system, and on the basis of obtaining the vertical bending stiffness and the torsional stiffness of the model, the stiffness of a side spring and the length of a suspension arm are determined firstly. In order to facilitate the operation of an experiment, the length of the suspension arm is determined in a proper range, the central spring is positioned at the torsional center of the two-dimensional rigid segment model, the torsional rigidity is not provided for the system, and the torsional rigidity is only determined by the product of the rigidity of the side spring and the length of the suspension arm, so that the rigidity of the side spring can be determined after the length of the suspension arm is determined. On the basis, the vertical bending stiffness is the sum of the stiffness of the side springs and the stiffness of the central spring, and the stiffness of the central spring can be determined by subtracting the sum of the stiffness of the side springs from the calculated vertical bending stiffness.
Any technical solution disclosed in the present invention is, unless otherwise stated, disclosed a numerical range if it is disclosed, and the disclosed numerical range is a preferred numerical range, and any person skilled in the art should understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Because numerical value is more, can't be exhaustive, so the utility model discloses just disclose some numerical values with the illustration the technical scheme of the utility model to, the numerical value that the aforesaid was enumerated should not constitute right the utility model discloses create the restriction of protection scope.
If the terms "first," "second," etc. are used herein to define parts, those skilled in the art will recognize that: the terms "first" and "second" are used merely to distinguish one element from another in a descriptive sense and are not intended to have a special meaning unless otherwise stated.
Also, above-mentioned the utility model discloses if disclose or related to mutually fixed connection's spare part or structure, then, except that other the note, fixed connection can understand: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, the terms used in any aspect of the present disclosure as described above to indicate positional relationships or shapes include similar, analogous, or approximate states or shapes unless otherwise stated.
The utility model provides an arbitrary part both can be assembled by a plurality of solitary component parts and form, also can be the solitary part that the integrated into one piece technology was made.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (5)
1. The elastic suspension system for the wind tunnel experiment of the bridge segment model is characterized by comprising rigid segment models, wherein suspension systems are arranged on two sides of each rigid segment model, each suspension system comprises supporting rigid frames which are arranged in an up-down symmetrical mode and rigid supporting connecting rods which are arranged between the two supporting rigid frames, each rigid supporting connecting rod is connected with the supporting rigid frames through three groups of springs which are arranged in an up-down symmetrical mode, and the three groups of springs are respectively a side spring, a central spring and a side spring from front to back.
2. The elastic suspension system for wind tunnel experiment of bridge segment model according to claim 1, wherein the distance between the central spring and the side spring on the rigid support link is the length of the suspension arm.
3. The elastic suspension system for wind tunnel experiment of bridge segment model according to claim 1, wherein the central spring is located at the center of the support link, and the side springs are symmetrically arranged at two sides by taking the central spring as the center.
4. The elastic suspension system for wind tunnel experiment of bridge segment model according to claim 1, wherein the rigid support connecting rod is fixed on two sides of the rigid segment model, and two ends of the rigid segment model are provided with two-element end plates.
5. The elastic suspension system for wind tunnel experiment of bridge segment model according to claim 1, wherein a sensor is arranged at the end of the rigid support connecting rod for recording displacement time-course curve or acceleration time-course curve of model vibration.
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| CN202021995712.9U CN213068131U (en) | 2020-09-14 | 2020-09-14 | Elastic suspension system for wind tunnel experiment of bridge segment model |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113267319A (en) * | 2021-07-01 | 2021-08-17 | 长沙理工大学 | Wind tunnel test system and method for free vibration without mutual interference of double-amplitude and multi-amplitude segments |
| CN115791073A (en) * | 2022-10-14 | 2023-03-14 | 港珠澳大桥管理局 | Pneumatic self-excitation force testing device |
-
2020
- 2020-09-14 CN CN202021995712.9U patent/CN213068131U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113267319A (en) * | 2021-07-01 | 2021-08-17 | 长沙理工大学 | Wind tunnel test system and method for free vibration without mutual interference of double-amplitude and multi-amplitude segments |
| CN115791073A (en) * | 2022-10-14 | 2023-03-14 | 港珠澳大桥管理局 | Pneumatic self-excitation force testing device |
| CN115791073B (en) * | 2022-10-14 | 2023-11-28 | 港珠澳大桥管理局 | Pneumatic self-excitation force testing device |
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