CN115791073A - Pneumatic self-excitation force testing device - Google Patents
Pneumatic self-excitation force testing device Download PDFInfo
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- 238000005259 measurement Methods 0.000 description 6
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- 238000009434 installation Methods 0.000 description 2
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- 238000004806 packaging method and process Methods 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The invention relates to a pneumatic self-excitation force testing device. The two end plates are respectively arranged at two opposite sides of the bridge model; the measuring mechanism comprises a first measuring component and a second measuring component, the first measuring component is used for measuring displacement data of the bridge model, and the second measuring component is used for measuring force data of the bridge model; the supporting mechanism is used for supporting the end plates so that the bridge model can move freely. When simulated wind power is applied to the pneumatic self-excitation force testing device, calculating and obtaining the pneumatic self-excitation force of the bridge model based on displacement data and force data according to Newton's second law and the motion balance relation of the bridge model; compared with the traditional pneumatic self-excitation force testing method, the pneumatic self-excitation force testing device does not need to reversely push the pneumatic self-excitation force through the displacement data, but directly and efficiently calculates the pneumatic self-excitation force through the measured force data and the displacement data, and reduces errors in the reverse pushing calculation process.
Description
Technical Field
The invention relates to the technical field of wind tunnel test devices, in particular to a pneumatic self-excitation force testing device.
Background
The wind load borne by the cross section of the bridge girder is generally divided into a calm wind load, a buffeting force, a self-excitation force, a vortex shedding force and the like, and when strong wind-induced vibration occurs to the bridge, the bridge is collapsed, and disastrous results are caused.
In the traditional technology, a free vibration force measurement method is mostly adopted in the method for testing the pneumatic self-excitation force of the bridge, however, the free vibration force measurement method needs to reversely push the pneumatic self-excitation force by measuring the displacement of a bridge section model, the process is complicated, and large errors can be generated in the process of reversely pushing calculation, so that the reference value of a calculation result is low, and the data accuracy is poor.
Disclosure of Invention
Therefore, it is necessary to provide a pneumatic self-excitation force testing device, which can directly and efficiently measure pneumatic self-excitation force and has small error of measurement result, aiming at the problems of complicated process and large error of measuring pneumatic self-excitation force.
The technical scheme is as follows:
a pneumatic self-excitation force testing device comprising:
the two end plates are arranged and are respectively used for being arranged on two opposite sides of the bridge model;
the measuring mechanism is arranged on at least one end plate and comprises a first measuring component and a second measuring component, the first measuring component is used for measuring displacement data of the bridge model, and the second measuring component is used for measuring force data of the bridge model;
and the supporting mechanism is used for supporting the end plates so as to enable the bridge model to move freely.
When the pneumatic self-excitation force testing device is applied with simulated wind power to enable the pneumatic self-excitation force testing device to be in a simulated working condition, the supporting mechanism simulates the rigidity and the damping of a real bridge, the end plate is used for guaranteeing the binary fluidity of a bridge model under the simulated working condition, the first measuring assembly measures the displacement data of the bridge model under the simulated working condition, the second measuring assembly measures the force data of the bridge model under the simulated working condition, and the pneumatic self-excitation force of the bridge model is calculated and obtained on the basis of the displacement data and the force data according to the Newton's second law and the motion balance relation of the bridge model; compared with the traditional pneumatic self-exciting force testing device, the pneumatic self-exciting force testing device does not need to reversely push the pneumatic self-exciting force through displacement data, and directly calculates the pneumatic self-exciting force through the measured force data and the displacement data, so that errors in the process of reversely pushing calculation are reduced, and the calculation is more efficient.
The technical solution is further explained as follows:
in one embodiment, the measuring mechanism comprises a fixed frame, the fixed frame is provided with two and corresponds to the end plates one by one, the fixed frame is located on one side of the end plates, which is far away from the bridge model, and the fixed frame is provided with the first measuring component and the second measuring component.
So set up, can obtain multiunit data, reduce the error, improve the data accuracy.
In one embodiment, the fixed frame comprises an inner frame and an outer frame, at least one part of the inner frame is located in the outer frame, so that a gap is formed between the inner frame and the outer frame, the inner frame is connected with the end plate, the outer frame is connected with the supporting mechanism, the first measuring assembly is arranged on one side of the inner frame, which is far away from the bridge model, and the second measuring assembly is located in the gap between the inner frame and the outer frame and abuts against the inner frame and the outer frame.
The bridge model is connected with the end plate, the end plate is connected with the inner frame, the first measuring component is arranged on the inner frame, when the pneumatic self-excitation force testing device is in a simulation working condition, the bridge model vibrates and drives the end plate to vibrate, the end plate drives the inner frame to vibrate, the inner frame vibrates, and therefore the first measuring component is driven to generate displacement, namely displacement data of the bridge model are measured; the inner frame extrudes the second measuring component due to vibration, so that the force of the bridge model is transmitted to the inner frame through the end plate, and then the inner frame is transmitted to the second measuring component, and the force data of the bridge model under the simulation working condition is obtained.
By the arrangement, displacement data and force data of the bridge model can be measured on the premise of not influencing the compact structure of the device.
In one embodiment, one of the end plate and the inner frame is provided with a protruding part, and the other one of the end plate and the inner frame is provided with a groove part, and the groove part is in limit fit with the protruding part.
Through setting up bellying and concave part to the connection of inside casing and end plate improves pneumatic self excitation testing arrangement's packaging efficiency.
In one embodiment, the support mechanism comprises at least two elastic members, one end of each elastic member is connected with the outer frame, and the other end of each elastic member is connected with the wall surface of the wind tunnel.
Utilize the elastic component to connect frame and wind-tunnel wall, make pneumatic self-excitation testing arrangement wholly hang in the wind-tunnel test region, the elastic action of elastic component enables its self to take place elastic deformation, and then drives the bridge model and float, makes the rigidity of device simulation true bridge and damped effect better.
In one embodiment, the first measuring assembly comprises a position finder, and the position finder is provided with at least two parts which are arranged on the inner frame at intervals;
the displacement data comprises linear displacement generated by the bridge model under a simulation working condition, and the position finder is used for measuring the linear displacement; and/or the presence of a gas in the atmosphere,
the displacement data comprises the angular displacement of the bridge model under the simulation working condition, and the position finder is used for measuring the angular displacement.
When the bridge model is in a simulation working condition, at least two position measuring meters are arranged on the inner frame at intervals, displacement data of the bridge model are amplified by the displacement data measured by the position measuring meters, the larger the measured data is, the smaller the influence of errors generated in the measuring process on the data is, and further the statistical error of the displacement data is reduced.
In one embodiment, the second measuring assembly comprises at least two load cells, and all the load cells are arranged at intervals and surround the outer periphery of the inner frame;
the force data comprises a torque generated by the bridge model under a simulated condition, and the dynamometer is used for measuring the torque; and/or the presence of a gas in the atmosphere,
the force data includes a contact force generated by the bridge model under a simulated condition, and the dynamometer is used for measuring the contact force.
By arranging at least two dynamometers, the torque and/or contact force generated by the bridge model in the simulated working condition is obtained, and the pneumatic self-excitation force of the bridge model obtained through calculation processing is more accurate and reliable based on the measured torque and/or contact force and displacement data.
In one embodiment, the two fixed frames are respectively a first fixed frame and a second fixed frame, all data measured by the dynamometer corresponding to the first fixed frame are used for synthesizing first data, all data measured by the dynamometer corresponding to the second fixed frame are used for synthesizing second data, and the force data is synthesized based on the first data and the second data.
The first data and the second data are utilized to synthesize force data, so that data errors can be reduced, and the accuracy of the force data of the bridge model under the simulation working condition is improved.
In one embodiment, the measurement mechanism further comprises a data processor electrically connected to the first measurement component and the second measurement component.
Through first measuring component of data processor electric connection and second measuring component, can convenient and fast ground acquire the displacement data that the first measuring component measured and the power data that the second measuring component measured when the bridge model is in the simulated condition.
In one embodiment, the data processor calculates the pneumatic self-excitation of the bridge model based on the following formula:
f se ＝f total -f inertial ；
wherein f is se The pneumatic self-excitation force of the bridge model is obtained; f. of total Is the force data; f. of inertial The inertial force of the bridge model is taken as the inertial force; m is a group of model The quality of the bridge model;
acceleration data for the bridge model, the acceleration data
And calculating through the displacement data and the force data.
The measured force data and displacement data are calculated through the data processing module, and the pneumatic self-excitation force of the bridge model under the simulated working condition can be quickly and accurately obtained.
Drawings
FIG. 1 is a front view of a pneumatic self-excitation force testing device in one embodiment of the present invention;
FIG. 2 isbase:Sub>A schematic sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic cross-sectional view taken along line B-B of FIG. 1;
fig. 4 is an assembly view of the first end plate, the first boss, the first fixing frame, the position finder, the load cell, and the elastic member.
100. A bridge model; 210. a first end plate; 211. a first boss portion; 220. a second end plate; 221. a second boss; 310. a first fixed frame; 311. a first inner frame; 312. a first outer frame; 320. a second fixed frame; 321. a second inner frame; 322. a second outer frame; 330. a position finder; 340. a force gauge; 400. an elastic member.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will recognize without departing from the spirit and scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Referring to fig. 1 and 2, an embodiment of the present invention provides a pneumatic self-excitation force testing apparatus, including a bridge model 100; the two end plates are arranged on two opposite sides of the bridge model 100 respectively; at least one end plate is provided with a measuring mechanism, the measuring mechanism comprises a first measuring component and a second measuring component, the first measuring component is used for measuring the displacement data of the bridge model 100, and the second measuring component is used for measuring the force data of the bridge model 100; the supporting mechanism is used for supporting the end plates so that the bridge model 100 can move freely.
When the simulated wind power is applied to the pneumatic self-excitation force testing device to enable the pneumatic self-excitation force testing device to be in a simulated working condition, the supporting mechanism simulates the rigidity and the damping of a real bridge, and the end plates are used for ensuring the binary fluidity of the bridge model 100 under the simulated working condition so as to avoid the adverse effect of three-dimensional streaming at two ends of the bridge model 100 on the test and form a torsional vibration system; the first measuring component measures displacement data of the bridge model 100 under a simulation working condition, the second measuring component measures force data of the bridge model 100 under the simulation working condition, and the pneumatic self-excitation force of the bridge model 100 is calculated and obtained based on the displacement data and the force data according to the Newton's second law and the motion balance relation of the bridge model 100; compared with the traditional pneumatic self-exciting force testing device, the pneumatic self-exciting force testing device does not need to reversely push the pneumatic self-exciting force through displacement data, the pneumatic self-exciting force is directly and efficiently calculated through the measured force data and the displacement data, errors in the process of reversely pushing calculation are reduced, and the obtained pneumatic self-exciting force is used for identifying flutter derivative.
In one embodiment, the ratio of the length of the bridge model 100 to the width of the bridge model 100 is 2-4 to ensure the stability and reliability of the three-force coefficient under the simulation condition and to make the bridge model 100 have better spanwise correlation.
Specifically, the ratio of the length of the bridge model 100 to the width of the bridge model 100 is 3.
In one embodiment, the ratio of the width of the end plates to the width of the bridge model is greater than 1.4 or equal to 1.4 to better achieve binary flow of the bridge model 100 under simulated conditions.
As shown in fig. 1 and 2, the end plates are provided in two and respectively a first end plate 210 and a second end plate 220. In the view shown in fig. 1, the first end plate 210 is disposed at the left end of the bridge model 100, the second end plate 220 is disposed at the right end of the bridge model 100, and both the first end plate 210 and the second end plate 220 are provided with the first measuring component and the second measuring component.
In one embodiment, referring to fig. 1 and 2, the measuring mechanism includes two fixing frames, which correspond to the end plates one by one, the fixing frames are located on one side of the end plates away from the bridge model 100, and the first measuring assembly and the second measuring assembly are disposed on both of the two fixing frames.
As shown in fig. 1 and 2, the fixing frame is provided with two and respectively a first fixing frame 310 and a second fixing frame 320. In the view shown in fig. 1, the first fixing frame 310 is located on the side of the first end plate 210 away from the bridge model 100, i.e., on the left side of the first end plate 210, and the second fixing frame 320 is located on the side of the second end plate 220 away from the bridge model 100, i.e., on the right side of the second end plate; the first and second fixing frames 310 and 320 are provided with first and second measuring assemblies thereon.
By the arrangement, force data and displacement data of the multiple groups of bridge models 100 under the simulation working condition can be obtained, so that data errors are reduced, and data accuracy is improved.
In one embodiment, the first and second fixing frames 310 and 320 are made of a high rigidity material such as stainless steel, making the first and second fixing frames 310 and 320 more durable to extend the life span of the first and second fixing frames 310 and 320.
In one embodiment, taking the view angle of fig. 2 as an example, the length of the first fixing frame 310 is the length in the vertical direction, and the width of the bridge model 100 is the width in the vertical direction; the length of the first fixed frame 310 is 3-4 times the width of the bridge model 100.
In one embodiment, referring to fig. 1 to 3, the fixing frame includes an inner frame and an outer frame, at least a portion of the inner frame is located within the outer frame such that a gap is formed between the inner frame and the outer frame; the inner frame is connected with the end plate, the outer frame is connected with the supporting mechanism, and the first measuring assembly is arranged on one side, far away from the bridge model 100, of the inner frame; the second measuring component is positioned in the gap between the inner frame and the outer frame and presses the inner frame and the outer frame.
Because the bridge model 100 is connected with the end plate, the end plate is connected with the inner frame, and the first measuring component is arranged on the inner frame, when the pneumatic self-excitation force testing device is in a simulation working condition, the bridge model 100 vibrates and drives the end plate to vibrate, the end plate drives the inner frame to vibrate, and the inner frame vibrates, so that the first measuring component is driven to generate displacement, namely, the displacement data of the bridge model 100 is measured; the inner frame extrudes the second measuring component due to vibration, so that the force of the bridge model 100 is transmitted to the inner frame through the end plate, and then the force of the bridge model 100 is transmitted to the second measuring component, so that force data of the bridge model 100 under the simulated working condition are obtained; in this way, the displacement data and the force data of the bridge model 100 can be measured without affecting the compact structure of the apparatus.
As shown in fig. 1 to 3, the first and second fixing frames 310 and 320 have the same structure, and the connection structure of the first fixing frame 310 and the first end plate 210 is the same as the connection structure of the second fixing frame 320 and the second end plate 220, and therefore, the connection structure of the first fixing frame 310 and the first end plate 210 will be described as an example, as shown in fig. 3: the first fixed frame 310 includes a first inner frame 311 and a first outer frame 312, the first outer frame 312 is a closed annular frame and is disposed at the outer periphery of the first inner frame 311; the first inner frame 311 is connected to the first end plate 210, and the first outer frame 312 is connected to the support mechanism. The connection structure of the second fixing frame 320 is the same as the first fixing frame 310 and is not described in detail herein.
In one embodiment, the first end plate 210 and the first inner frame 311 are connected by a snap connection or other detachable connection for easy detachment.
In one embodiment, the first inner frame 311 and the first outer frame 312 are rectangular, thereby forming the first fixed frame 310 in a shape of a letter 'hui'.
In one embodiment, referring to fig. 1, 2 and 4, optionally, one of the end plate and the inner frame is provided with a protrusion portion, and the other is provided with a groove portion, and the groove portion is in limit fit with the protrusion portion.
Through setting up boss and concave part to in the connection of inside casing and end plate, improve pneumatic self excitation testing arrangement's packaging efficiency.
Alternatively, the protrusion portion is provided on the end plate, and the groove portion is provided on the inner frame.
In one embodiment, the protruding portion is a cylinder or a cuboid, and the inner shape of the groove portion is matched with the protruding portion, so that the protruding portion and the groove portion are in plug-in fit.
As shown in fig. 1, 2 and 4, the protruding portions are two and are respectively a first protruding portion 211 and a second protruding portion 221, the first protruding portion 211 is disposed on the first end plate 210, the second protruding portion 221 is disposed on the second end plate 220, the groove portions are two (groove portions not shown in the figure) and are respectively a first groove portion and a second groove portion, the first groove portion is disposed on the first inner frame 311, the second groove portion is disposed on the second inner frame 321, and when the assembly is performed, the first protruding portion 211 is inserted into the first groove portion, and the second protruding portion 221 is inserted into the second groove portion, so as to achieve the installation of the inner frame and the end plates.
In one embodiment, referring to fig. 1 and fig. 3, the supporting mechanism includes at least two elastic members 400, one end of the elastic member 400 is connected to the outer frame, the other end of the elastic member 400 is connected to the wall of the wind tunnel (not shown), and the elastic member 400 is used to connect the outer frame and the wall of the wind tunnel.
Through setting up elastic component 400, make pneumatic self-excitation testing arrangement wholly hang in the wind tunnel test region, the elastic action of elastic component 400 enables its self elastic deformation, and then drives bridge model 100 and float, makes the effect of the rigidity and the damping of device simulation true bridge better.
As shown in fig. 1, 3 and 4, four elastic members 400, which are respectively a first elastic member, a second elastic member, a third elastic member and a fourth elastic member, are provided to be correspondingly connected to the first fixing frame; as shown in fig. 3, the first elastic member, the second elastic member, the third elastic member and the fourth elastic member are used for supporting the first outer frame 312, the first elastic member and the second elastic member are respectively disposed at two ends of the upper plane of the first outer frame 312, and the third elastic member and the fourth elastic member are respectively disposed at two ends of the lower plane of the first outer frame 312; as shown in fig. 1, four elastic members 400 for supporting the second outer frame 322 are also provided in the same manner as described above, and thus, the description thereof is omitted.
In one embodiment, both ends of the elastic member 400 are respectively provided with a first connector for connecting the elastic member 400 with the wall surface of the wind tunnel and a second connector for connecting the elastic member 400 with the outer frame.
Optionally, the first and second connectors may each be a hook or a snap to facilitate installation.
Specifically, the elastic member 400 is a spring, and the spring has the advantages of low cost, good elasticity, and the like.
In the description of the invention, for ease of understanding, both fig. 2 and 3 show a position finder 330 and a load cell 340.
In one embodiment, referring to fig. 1-4, the first measuring assembly includes a position finder 330, and the position finder 330 is provided with at least two and spaced apart positions on the inner frame.
Optionally, the displacement data includes a line displacement generated by the bridge model 100 under a simulation condition, and the position finder 330 is used for measuring the line displacement.
Optionally, the displacement data includes an angular displacement generated by the bridge model 100 under a simulated condition, and the position finder 330 is used for measuring the angular displacement.
Optionally, the displacement data includes linear and angular displacements of the bridge model 100 under simulated conditions, and the position finder 330 is used to measure the linear and angular displacements.
As shown in fig. 1 to 4, the pneumatic self-excitation force testing device is provided with four position measuring meters 330, wherein two position measuring meters 330 are arranged at intervals on the side of the first inner frame 311 away from the first end plate 210, and the other two position measuring meters 330 are arranged at intervals on the side of the second inner frame 321 away from the second end plate 220; so set up, when pneumatic self excitation testing arrangement was in under the simulation operating mode, the linear displacement and the angle displacement of bridge model 100 have been enlargied to the linear displacement and the angle displacement that position finder 330 measured, and the displacement data that the measurement obtained is big more, and the error that produces in the measurement process is less to the influence of displacement data, and then has reduced the statistical error of displacement data.
Referring to fig. 1 to 4, the second measuring unit includes at least two load cells 340, and all of the load cells 340 are spaced apart and surround the outer circumference of the inner frame.
Optionally, the force data includes the torque produced by the bridge model 100 under simulated conditions, and the dynamometer 340 is used to measure the torque.
Optionally, the force data includes a contact force generated by the bridge model 100 under simulated conditions, and the load cell 340 is used to measure the contact force.
Optionally, the force data includes contact forces and torques generated by the bridge model 100 under simulated conditions, and the load cell 340 is used to measure the contact forces and torques.
When the bridge model 100 is in a simulated working condition, vibration is generated to drive the end plate to vibrate, the end plate drives the inner frame to vibrate, the inner frame extrudes the dynamometer 340 due to vibration, so that the force of the bridge model 100 is transmitted to the inner frame through the end plate, and the inner frame is transmitted to the dynamometer 340 to obtain force data of the bridge model 100 in the simulated working condition; based on the measured force data and in combination with the displacement data, the pneumatic self-excitation force of the bridge model 100 obtained through calculation and processing is more accurate and reliable.
In one embodiment, the data measured by all the load cells 340 corresponding to the first fixed frame 310 are used to synthesize first data, and the data measured by all the load cells 340 corresponding to the second fixed frame 320 are used to synthesize second data, and the force data is synthesized based on the first data and the second data.
In the embodiment of fig. 1 to 4, the first and second fixed frames 310 and 320 have the same structure, and the first and second fixed frames 310 and 320 are provided with four load cells 340, respectively; taking the first fixed frame 310 as an example: four force meters 340 are arranged on the first fixing frame 310 and comprise a first force meter, a second force meter, a third force meter and a fourth force meter, the first force meter and the third force meter vertically correspond to each other, the second force meter and the fourth force meter vertically correspond to each other, four data are measured by the four force meters 340 respectively, the four measured data are calculated to obtain first data, the four data measured by the four force meters 340 corresponding to the second fixing frame 320 are also calculated to obtain second data, force data of the bridge model 100 under a simulation working condition are calculated by using the first data and the second data, and the pneumatic self-excitation force of the bridge model 100 is calculated by combining displacement data.
In one embodiment, the force gauge 340 comprises an axial force gauge and the position gauge 330 comprises a displacement gauge; the first fixed frame 310 and the second fixed frame 320 have the same structure, and the first fixed frame 310 and the second fixed frame 320 are respectively provided with four axial force meters; the first inner frame 311 and the second inner frame 312 have the same structure, and the first inner frame 311 and the second inner frame 312 are respectively provided with two displacement meters; taking the first fixed frame 310 and the first inner frame 311 as an example: four axial force meters are arranged on the first fixing frame 310 and comprise a first axial force meter, a second axial force meter, a third axial force meter and a fourth axial force meter, the first axial force meter and the third axial force meter vertically correspond to each other, the second axial force meter and the fourth axial force meter vertically correspond to each other, four data are respectively measured by the four axial force meters, the four measured data are calculated to obtain first force data, similarly, the four data measured by the four axial force meters corresponding to the second fixing frame 320 are also calculated to obtain second force data, and the first force data and the second force data are calculated according to a preset algorithm to obtain force data of the bridge model 100 under a simulation working condition; two displacement meters are arranged on the first inner frame 311, and comprise a first displacement meter and a second displacement meter, the first displacement meter and the second displacement meter are arranged on one side, away from the bridge model 100, of the first inner frame 311 at intervals, so that first displacement data are measured, similarly, the two displacement meters corresponding to the second inner frame 312 measure second displacement data, the first displacement data and the second displacement data are calculated according to a preset algorithm to obtain displacement data of the bridge model 100 under a simulation working condition, the displacement data amplify the displacement data of the bridge model 100, the larger the measured data is, the smaller the influence of errors generated in the measuring process on the data is, and further the statistical errors of the displacement data are reduced; and calculating the displacement data and the force data according to a preset algorithm to obtain the pneumatic self-excitation force of the bridge model 100.
In one embodiment, the measuring mechanism further comprises a data processor (not shown), and the data processor is electrically connected with the first measuring component and the second measuring component.
The first measuring component and the second measuring component are electrically connected through the data processor, so that displacement data measured by the first measuring component and force data measured by the second measuring component of the bridge model 100 in a simulated working condition can be conveniently and quickly acquired.
In one embodiment, the data processor calculates the pneumatic self-excitation of the bridge model 100 based on the following equation:
f se ＝f total -f inertial ；
wherein f is se Is the pneumatic self-excitation of the bridge model 100; f. of total Is force data; f. of inertial Is the inertial force of the bridge model 100;M model is the mass of the bridge model 100;
acceleration data for the bridge model 100
And calculating by using the displacement data and the force data in a two-step difference mode and the like.
The measured force data and displacement data are calculated through the data processing module, and the pneumatic self-excitation force of the bridge model 100 under the simulated working condition can be quickly and accurately obtained.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A pneumatic self-excitation force testing device, comprising:
the two end plates are arranged and are respectively used for being arranged on two opposite sides of the bridge model;
the measuring mechanism is arranged on at least one end plate and comprises a first measuring component and a second measuring component, the first measuring component is used for measuring displacement data of the bridge model, and the second measuring component is used for measuring force data of the bridge model;
and the supporting mechanism is used for supporting the end plates so as to enable the bridge model to move freely.
2. The pneumatic self-excitation testing device of claim 1, wherein the measuring mechanism comprises two fixing frames, the two fixing frames correspond to the end plates in a one-to-one manner, the fixing frames are located on one side of the end plates, which is far away from the bridge model, and the first measuring assembly and the second measuring assembly are arranged on the two fixing frames.
3. The pneumatic self-excitation testing device of claim 2, wherein the fixing frame comprises an inner frame and an outer frame, at least a portion of the inner frame is located in the outer frame so as to form a gap between the inner frame and the outer frame, the inner frame is connected with the end plate, the outer frame is connected with the supporting mechanism, the first measuring component is arranged on one side of the inner frame, which is far away from the bridge model, and the second measuring component is located in the gap between the inner frame and the outer frame and presses the inner frame and the outer frame.
4. A pneumatic self-excitation force test apparatus according to claim 3, wherein one of the end plate and the inner frame is provided with a protruding portion, and the other of the end plate and the inner frame is provided with a recessed portion which is in a limit fit with the protruding portion.
5. The pneumatic self-excitation force testing device according to claim 3, wherein the supporting mechanism comprises at least two elastic members, one end of each elastic member is connected with the outer frame, and the other end of each elastic member is connected with the wall surface of the wind tunnel.
6. A pneumatic self-excitation force testing device according to claim 3, wherein the first measuring assembly comprises a position finder, the position finder being provided with at least two and spaced apart on the inner frame;
the displacement data comprises linear displacement generated by the bridge model under a simulation working condition, and the position measuring meter is used for measuring the linear displacement; and/or the presence of a gas in the atmosphere,
the displacement data comprises the angular displacement of the bridge model under the simulation working condition, and the position finder is used for measuring the angular displacement.
7. A pneumatic self-excitation force testing device according to claim 3, wherein the second measuring assembly comprises at least two load cells, all of which are spaced apart and surround the outer periphery of the inner frame;
the force data comprises a torque generated by the bridge model under a simulated condition, and the dynamometer is used for measuring the torque; and/or the presence of a gas in the atmosphere,
the force data includes a contact force generated by the bridge model under a simulated condition, and the dynamometer is used for measuring the contact force.
8. A pneumatic self-excitation force testing device according to claim 7, wherein the two fixed frames are a first fixed frame and a second fixed frame, respectively, data measured by all the load cells corresponding to the first fixed frame are used to synthesize first data, data measured by all the load cells corresponding to the second fixed frame are used to synthesize second data, and the force data are synthesized based on the first data and the second data.
9. A pneumatic self-excitation force testing device according to any one of claims 1 to 8, wherein the measuring mechanism further comprises a data processor electrically connecting the first measuring assembly and the second measuring assembly.
10. The pneumatic self-excitation force test device of claim 9, wherein the data processor calculates the pneumatic self-excitation force of the bridge model based on the following formula:
f se ＝f total -f inertial ；
wherein f is se The pneumatic self-excitation force of the bridge model is obtained; f. of total Is the force data; f. of inertial The inertial force of the bridge model is taken as the inertial force; m is a group of model The quality of the bridge model;
acceleration data for the bridge model, the acceleration data
And calculating through the displacement data and the force data.
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