CN110455489B - Wind tunnel test device for measuring surface wind pressure of bridge section vibration model - Google Patents
Wind tunnel test device for measuring surface wind pressure of bridge section vibration model Download PDFInfo
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- CN110455489B CN110455489B CN201910732487.5A CN201910732487A CN110455489B CN 110455489 B CN110455489 B CN 110455489B CN 201910732487 A CN201910732487 A CN 201910732487A CN 110455489 B CN110455489 B CN 110455489B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
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Abstract
The invention discloses a wind tunnel test device for measuring surface wind pressure of a vibration model of a bridge section, which comprises an elastic suspension section model test device part, a pressure-sensitive paint technology part and a synchronous vibration device part. The elastic suspension section model test device part comprises a test model, a suspension connecting rod, a suspension spring and a force measuring device; the pressure-sensitive paint technology part comprises a computer, a CCD camera, a filter, a luminous source and pressure-sensitive paint; the synchronous vibration device part comprises a camera foot rest, a foot rest fixing frame and a camera quick-mounting plate. The invention realizes synchronous vibration of the CCD camera in the pressure-sensitive paint technology and the test model of the test device in the elastic suspension section model through the synchronous vibration device, realizes relative stillness of the CCD camera and the test model, and enables the pressure-sensitive paint technology to be applied to the vibration model.
Description
Technical Field
The invention belongs to the technical field of accurate measurement, and particularly relates to a wind tunnel test device for measuring surface wind pressure of a vibration model of a bridge section.
Background
In the field of bridge construction, the design and the checking calculation of a large bridge need to measure the pressure of the surface of a test model of the large bridge in a wind tunnel so as to further detect the wind resistance of the large bridge in a natural environment, and thus, the design of the large bridge is optimized. In wind tunnel tests, pressure measurement and vibration measurement are common research means. At present, vibration measurement means are mature, and measurement is generally carried out by adopting a rigid or elastic suspension section model test method. The pressure measuring method is that many measuring holes are drilled on the surface of a test model, a pressure measuring pipe is embedded in the measuring holes, and pressure signals transmitted from the wind tunnel are transmitted to a computer outside the wind tunnel through a channel for air circulation and a cable, so that data analysis and processing are performed. Because the measuring holes of the chisel are discontinuous and have certain sizes and intervals, the traditional pressure testing method can only measure the surface pressure of a plurality of discrete points, and the distribution of points at the corners of the model is inconvenient. The area where the flow separation and reattachment are more complicated should be the focus of pressure measurement. However, the current common pressure measuring means cannot effectively measure the surface wind pressure of the areas.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the defects, the invention provides the wind tunnel test device for measuring the surface wind pressure of the bridge section vibration model, which utilizes the pressure-sensitive paint technology to measure the surface wind pressure of the bridge vibration model and can realize the synchronous measurement of the wind pressure and the vibration in the wind tunnel test.
The technical scheme is as follows: the invention provides a wind tunnel test device for measuring surface wind pressure of a vibration model of a bridge section, which comprises
A wind tunnel test device for measuring the surface wind pressure of a vibration model of a bridge section comprises a wind tunnel laboratory, an elastic suspension section model test device, a pressure-sensitive paint device and a synchronous vibration device; the pressure-sensitive paint device and the synchronous vibration device are both arranged on the elastic suspension section model test device; the elastic suspension section model test device comprises a test model, a suspension connecting rod, a suspension spring and a force measuring device; the pressure-sensitive paint device comprises a computer, a CCD camera, a filter, a luminous source and pressure-sensitive paint; the synchronous vibration device comprises a camera foot rest, a foot rest fixing clamp and a camera quick-mounting plate; the surface of the experimental model is coated with pressure-sensitive paint, two sides of the experimental model are respectively provided with a suspension connecting rod, a suspension spring is arranged on the suspension connecting rod, the tail end of the suspension spring is provided with a force measuring device, the middle part of the suspension connecting rod is provided with a camera foot rest, the tail end of the camera foot rest is provided with a CCD camera, a light-emitting light source is arranged on the inner wall of the wind tunnel laboratory, and the computer is electrically connected with the CCD camera.
Further, the camera foot rest is connected with the suspension connecting rod through a foot rest fixing clamp.
Furthermore, the tail end of the camera foot rest is connected with the CCD camera through a camera quick-mounting plate, and a filter is arranged on the CCD camera.
Further, the camera foot rest includes camera foot rest and lower camera foot rest, the CCD camera includes CCD camera and lower CCD camera, it sets up for hanging the connecting rod symmetry with lower camera foot rest to go up the camera foot rest, it sets up for hanging the connecting rod symmetry with lower CCD camera to go up the CCD camera.
Furthermore, an upper suspension spring and a lower suspension spring are symmetrically arranged at two ends of each suspension connecting rod, and the tail end of each spring is provided with a force measuring device.
Furthermore, a rubber gasket is arranged between the foot rest fixing clamp and the hanging connecting rod.
Furthermore, the light source comprises an upper light source and a lower light source, the upper light source is arranged at the top of the wind tunnel laboratory, and the lower light source is arranged at the bottom of the wind tunnel laboratory.
Furthermore, the camera foot rest is made of carbon fiber materials, the weight of a single camera foot rest is 0.8-1.5kg, the diameter of the camera foot rest is 30mm, and the camera foot rest is 40-80cm away from the experimental model.
Further, the synchronous vibration device is made of carbon fiber materials, and the total weight is 3-6 kg.
In order to make up for the defects of the traditional pressure measuring method, a pressure-sensitive paint technology can be adopted. The pressure-sensitive paint technology is a novel, non-contact, wind tunnel pressure testing method without destroying the testing model. The pressure-sensitive paint is a functional material consisting of luminescent probe molecules and a matrix material with higher oxygen permeability. The test method comprises the following steps: spraying prepared pressure-sensitive paint on the surface of a test model, acquiring test data by using a special CCD camera by virtue of an optical detection system, storing an image into a built-in memory card after the camera records related test image data, reading internal data of the memory card by using a computer, and processing the image by using the computer to obtain a complete distribution map of covering pressure.
Pressure measurement and vibration measurement are commonly used in wind tunnel tests, and more comprehensive information can be obtained if the pressure measurement and the vibration measurement can be synchronously performed. Because the pressure sensitive paint technology needs to splice the collected images to obtain the change of the surface wind pressure, if the model per se vibrates, the position information of the model needs to be additionally processed from the shot images, so that the test efficiency is greatly reduced, and the test precision and the test result are influenced. This technique, while capable of measuring a complete pressure profile, does not work well on vibration models. Therefore, an auxiliary device for the related test is needed to realize the synchronous measurement of the wind pressure and the vibration.
By adopting the technical scheme, the invention has the following beneficial effects:
1. the method comprises the following steps of (1) realizing the measurement of the air pressure of the whole surface of a section vibration model in a wind tunnel test to obtain a complete and accurate test element surface pressure diagram;
2. the wind tunnel test is simplified, the step of processing the vibration object image is omitted, and the test efficiency is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a side view of the present invention;
FIG. 3 is a front view of the present invention;
FIG. 4 is a top view of the present invention;
fig. 5 is a three-dimensional view of the stand securing clip of fig. 1.
Detailed Description
The present invention is further illustrated by the following examples, which are intended to be purely exemplary and are not intended to limit the scope of the invention, as various equivalent modifications of the invention will occur to those skilled in the art upon reading the present disclosure and fall within the scope of the appended claims.
As shown in fig. 1-5, a wind tunnel test device for measuring the surface wind pressure of a segment vibration model based on a pressure-sensitive paint technology comprises a test model 1, an upper camera foot rest 2, a lower camera foot rest 3, a foot rest fixing clamp 4, a camera quick-mounting plate 5, an upper CCD camera 6, a lower CCD camera 7, a filter 8, an upper light-emitting source 9, a lower light-emitting source 10, a suspension connecting rod 11, a suspension spring 12, a wind tunnel laboratory 13, a rubber gasket 14 and a computer 15;
the test model 1 is suspended on a connecting rod 11 and can perform vertical vibration and torsional vibration under the control of a suspension spring 12. A force measuring device is arranged at the end part of the suspension spring 12, and the vibration state of the test model 1 can be calculated through force measurement; the test model 1 is coated with pressure-sensitive paint according to test requirements, specific fluorescence can be generated under a light source, an image of the test model 1 is collected through a CCD camera and is transmitted to a computer 15 for processing through a memory card arranged in the camera, and synchronous measurement of wind pressure and vibration is completed;
the upper camera foot rest 2 and the lower camera foot rest 3 are fixed on the suspension connecting rod 11 through foot rest fixing clamps 4, and the CCD camera is fixed through a camera quick-mounting plate 5, so that synchronous vibration of the camera and the test model 1 is realized;
the tripod fixing clamp 4 is positioned at the bottom end of the camera tripod and is used for fixing the camera tripod on the suspension connecting rod 11;
the camera quick-mounting plate 5 is a connecting device between the CCD camera and the foot rest, so that the CCD camera can be quickly mounted and dismounted, and the stability of the camera on the foot rest is ensured;
the upper CCD camera 6 and the lower CCD camera 7 are respectively 2 and are respectively connected to the upper camera foot stand 2 and the lower camera foot stand 3 through the camera quick-mounting plate 5. The upper CCD camera and the lower CCD camera are respectively positioned above and below the test model 1 and are used for shooting the upper surface and the lower surface of the model and transmitting image data to the computer 15 for processing, so that a complete surface pressure diagram can be formed;
the filters 8 are positioned in front of the lenses of the upper CCD camera 6 and the lower CCD camera 7, and the number of the filters is 4. The function of the device is to filter light except the fluorescent light of the pressure-sensitive paint and prevent other light sources from influencing the wind pressure test;
the upper light emitting source 9 and the lower light emitting source 10 are respectively positioned at the top and the bottom of the wind tunnel laboratory 13 and used for illuminating the upper part and the lower part of the test model 1. The function of which is to emit the light necessary for the test of the pressure-sensitive paint and to return the pressure-sensitive paint to a specific fluorescence. Different types of light sources are selected according to the types of the pressure-sensitive paint;
the two groups of suspension connecting rods 11 are respectively positioned at two sides of the test model 1; the number of the suspension springs 12 is 8, and the number of the suspension springs is 4 on each side of two ends of the test model 1. The force measuring device at the end part of the spring can record the stress change of the test model 1;
the wind tunnel laboratory 13 is a place for carrying out a wind tunnel test, and all the devices mentioned in the patent need to be tested in the wind tunnel laboratory 13;
the rubber gasket 14 is positioned between the foot rest fixing clamp 4 and the hanging connecting rod 11, and aims to increase the friction between the foot rest fixing clamp 4 and the hanging connecting rod 11 and prevent the camera foot rest from sliding along with the vibration of a test model in the test process.
The embodiments of the present invention are described in detail above with reference to the drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the spirit and scope of the invention.
Claims (9)
1. A wind tunnel test device for measuring the surface wind pressure of a vibration model of a bridge section is characterized by comprising a wind tunnel laboratory, an elastic suspension section model test device, a pressure-sensitive paint device and a synchronous vibration device; the pressure-sensitive paint device and the synchronous vibration device are both arranged on the elastic suspension section model test device; the elastic suspension section model test device comprises a test model, a suspension connecting rod, a suspension spring and a force measuring device; the pressure-sensitive paint device comprises a computer, a CCD camera, a filter, a luminous source and pressure-sensitive paint; the synchronous vibration device comprises a camera foot rest, a foot rest fixing clamp and a camera quick-mounting plate; the utility model discloses a wind tunnel experiment room, including test model, test model surface scribbles pressure sensitive paint, the test model both sides are provided with respectively hangs the connecting rod, it is provided with suspension spring on the connecting rod to hang, the suspension spring end is provided with measuring force device, it is provided with the camera foot rest to hang the connecting rod middle part, camera foot rest end is provided with the CCD camera, be provided with luminescent light source on the wind tunnel experiment room inner wall, the computer is connected with CCD camera electricity.
2. The wind tunnel test device for measuring the surface wind pressure of the vibration model of the bridge section according to claim 1, wherein the camera foot rest is connected with the suspension connecting rod through a foot rest fixing clamp.
3. The wind tunnel test device for measuring the surface wind pressure of the vibration model of the bridge section according to claim 1, wherein the tail end of the camera foot rest is connected with a CCD camera through a camera quick-mounting plate, and a filter is arranged on the CCD camera.
4. The wind tunnel test device for measuring the wind pressure on the surface of the vibration model of the bridge segment according to claim 1, wherein the camera foot stand comprises an upper camera foot stand and a lower camera foot stand, the CCD camera comprises an upper CCD camera and a lower CCD camera, the upper camera foot stand and the lower camera foot stand are symmetrically arranged relative to the suspension connecting rod, and the upper CCD camera and the lower CCD camera are symmetrically arranged relative to the suspension connecting rod.
5. The wind tunnel test device for measuring the surface wind pressure of the vibration model of the bridge section according to claim 1, wherein an upper suspension spring and a lower suspension spring are symmetrically arranged at two ends of each suspension connecting rod, and a force measuring device is arranged at the tail end of each spring.
6. The wind tunnel test device for measuring the surface wind pressure of the vibration model of the bridge section according to claim 1, wherein a rubber gasket is arranged between the foot rest fixing clamp and the suspension connecting rod.
7. The wind tunnel test device for measuring the surface wind pressure of the vibration model of the bridge segment according to claim 1, wherein the light source comprises an upper light source and a lower light source, the upper light source is arranged at the top of the wind tunnel laboratory, and the lower light source is arranged at the bottom of the wind tunnel laboratory.
8. The wind tunnel test device for measuring the surface wind pressure of the vibration model of the bridge segment according to claim 1, wherein the camera foot rest is made of carbon fiber material, the weight of the single foot is 0.8-1.5kg, the diameter is 30mm, and the distance from the test model is 40-80 cm.
9. The wind tunnel test device for measuring the surface wind pressure of the vibration model of the bridge section according to claim 1, wherein the synchronous vibration device is made of carbon fiber material and has a total weight of 3-6 kg.
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| CN112268684B (en) * | 2020-12-14 | 2021-03-19 | 中国空气动力研究与发展中心低速空气动力研究所 | Variable azimuth angle surface pressure measuring system and method for low-speed wind tunnel rotor model |
| CN113465866B (en) * | 2021-07-09 | 2022-03-08 | 西南交通大学 | Test device with static and dynamic test functions of bridge section model |
| CN114323543B (en) * | 2022-03-10 | 2022-05-17 | 中国空气动力研究与发展中心高速空气动力研究所 | Method for improving test efficiency of pressure-sensitive paint |
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| JP2002082014A (en) * | 2000-06-26 | 2002-03-22 | Kitakiyuushiyuu Techno Center:Kk | Device and method of accurately measuring non- stationary aerodynamic |
| KR101102659B1 (en) * | 2010-07-13 | 2012-01-04 | 목포대학교산학협력단 | Apparatus for oscillating model of bridge for wind tunnel |
| CN102146980B (en) * | 2011-01-07 | 2012-12-05 | 湖南大学 | Rigid sectional model damp continuous regulating device for wind-tunnel test |
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