Method, apparatus, electronic device and storage medium for determining static three-component force coefficients

Abstract

The present invention provides a method, device, electronic device and storage medium for determining static three-component force coefficients, relating to the technical field of cable-stayed bridges. The method includes: after the target rigid segment model reaches a steady state, collecting target images of the target rigid segment model at multiple wind speeds; for each wind speed, determining the relative displacement of the target rigid segment model at the wind speed with respect to the target rigid segment model at the target wind speed according to the center positions of a first target circle and a second target circle in the target image; and obtaining the static three-component force coefficients of the target rigid segment model according to the relative displacement and the conversion relationship between displacement and force. That is, the solution of the present application avoids using a high-precision force measuring balance to determine the static three-component force coefficients, thereby reducing the experimental cost and the installation difficulty of the experiment, and further improving the experimental efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of long-span bridges, and in particular to a method, device, electronic device and storage medium for determining static three-component force coefficients. Background Art

[0002] With the development of the economy and the progress of technology, the span of bridges has been greatly increased. However, long-span bridges are prone to large-amplitude vibrations under the excitation of wind loads due to their low-frequency and low-damping characteristics, which affects the safety of bridge structures. The static three-component force coefficients refer to the drag coefficient, lift coefficient, and moment coefficient of the bridge. In the study of the wind resistance performance of long-span bridges, the static three-component force coefficients are key parameters in the buffeting response analysis and static wind load stability study, and their accurate determination directly affects the accuracy of the wind resistance performance study of bridges.

[0003] Currently, a rigid segment model with a certain scale ratio is usually made first, and then the static three-component force coefficients are measured by conducting a wind tunnel test on the rigid segment model.

[0004] However, in the wind tunnel test, a high-precision force measuring balance is required during the measurement process. The high-precision force measuring balance has disadvantages such as difficult installation, high instrument cost, easy damage, and low experimental efficiency. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a method, device, electronic device and storage medium for determining static three-component force coefficients to solve the problem that in the prior art, a high-precision force measuring balance is required during the wind tunnel test. The high-precision force measuring balance has disadvantages such as difficult installation, high instrument cost, easy damage, and low experimental efficiency.

[0006] To solve the above technical problems, the technical solution proposed by the present invention is as follows:

[0007] In a first aspect, the present application provides a method for determining static three-component force coefficients, the method comprising:

[0008] After the target rigid segment model reaches a steady state, collect target images of the target rigid segment model at multiple wind speeds; wherein, the target of the target rigid segment model includes a first target circle, a second target circle, and a cross mark, the cross mark is located at the center of the target, the distance between the center of the first target circle and the center of the target is equal to the distance between the center of the second target circle and the center of the target, and the radius of the first target circle is greater than the radius of the second target circle;

[0009] For each wind speed, based on the center positions of the first target circle and the second target circle in the target image, determine the relative displacement of the target rigid segment model at the wind speed with respect to the target rigid segment model at the target wind speed;

[0010] Obtain the static three-component force coefficient of the target rigid segment model according to the relative displacement and the conversion relationship between displacement and force.

[0011] In a second aspect, the present application provides a device for determining a static three-component force coefficient, the device comprising:

[0012] An acquisition module, configured to acquire target images of the target rigid segment model at multiple wind speeds after the target rigid segment model reaches a steady state; wherein, the target of the target rigid segment model includes a first target circle, a second target circle, and a cross mark, the cross mark is located at the center of the target, the distance between the center of the first target circle and the center of the target is equal to the distance between the center of the second target circle and the center of the target, and the radius of the first target circle is greater than the radius of the second target circle;

[0013] A displacement determination module, configured to, for each wind speed, based on the center positions of the first target circle and the second target circle in the target image, determine the relative displacement of the target rigid segment model at the wind speed with respect to the target rigid segment model at the target wind speed;

[0014] A coefficient determination module, configured to obtain the static three-component force coefficient of the target rigid segment model according to the relative displacement and the conversion relationship between displacement and force.

[0015] In a third aspect, the present application provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein when the processor executes the program, the method for determining a static three-component force coefficient as described in any embodiment of the present application is implemented.

[0016] In a fourth aspect, the present application provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the method for determining a static three-component force coefficient as described in any embodiment of the present application is implemented.

[0017] In a fifth aspect, the present application provides a computer program product, including a computer program, and when the computer program is executed by a processor, the method for determining a static three-component force coefficient as described in any embodiment of the present application is implemented.

[0018] Compared with the prior art, the advantages of the present invention are as follows: after the target rigid segment model reaches a steady state, target images of the target rigid segment model are collected at multiple wind speeds; wherein, the target of the target rigid segment model includes a first target circle, a second target circle, and a cross mark, the cross mark is located at the center of the target, the distance between the center of the first target circle and the center of the target is equal to the distance between the center of the second target circle and the center of the target, and the radius of the first target circle is greater than the radius of the second target circle; for each wind speed, according to the center positions of the first target circle and the second target circle in the target image, the relative displacement of the target rigid segment model at the wind speed with respect to the target rigid segment model at the target wind speed is determined; according to the relative displacement and the conversion relationship between displacement and force, the static three-component force coefficient of the target rigid segment model is obtained. That is, the solution of the present application determines the relative displacement of the target rigid segment model according to the image, and determines the static three-component force coefficient of the target rigid segment model according to the relative displacement information, thereby avoiding the use of a high-precision force measuring balance to determine the static three-component force coefficient, thus reducing the experimental cost and the installation difficulty of the experiment, and eliminating the need to repeatedly obtain the static three-component force coefficient through a high-precision force measuring balance in repeated wind tunnel tests, thereby improving the experimental efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In the following, the present invention will be described in more detail based on embodiments and with reference to the accompanying drawings. Among them:

[0020] Figure 1 is a schematic flow chart of a method for determining the static three-component force coefficient provided by the present application;

[0021] Figure 2 is another schematic flow chart of a method for determining the static three-component force coefficient provided by the present application;

[0022] Figure 3 is an exemplary diagram of a target rigid segment model of a method for determining the static three-component force coefficient provided by the present application;

[0023] Figure 4 is a schematic structural diagram of a device for determining the static three-component force coefficient provided by the present application;

[0024] Figure 5 is a schematic structural diagram of an electronic device provided by the present application;

[0025] Reference Signs:

[0026] 1 - Spring; 2 - Model Body; 3 - Target. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments, but the protection scope of the present invention is not limited thereby.

[0028] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "assembled", "connected", "joined", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0032] Figure 1 is a flowchart of a method for determining static three-component force coefficients provided by the present application. This method can be executed by a device for determining static three-component force coefficients, and this device can be implemented in software and / or hardware. In a specific embodiment, this device can be applied in an electronic device, and the electronic device can be a computer. The following embodiments will be described by taking this device applied in an electronic device as an example. Refer to Figure 1 , and the method specifically may include the following steps:

[0033] Step 101, after the target rigid segment model reaches a steady state, collect target images of the target rigid segment model at multiple wind speeds.

[0034] Among them, the target of the target rigid segment model includes a first target circle, a second target circle, and a cross mark. The cross mark is located at the center of the target. The distance between the center of the first target circle and the center of the target is equal to the distance between the center of the second target circle and the center of the target, and the radius of the first target circle is greater than the radius of the second target circle.

[0035] Specifically, the target rigid segment model is a model that can simulate the stress conditions of long-span bridges. A target is attached to one section of the target rigid segment model to determine the displacement of the target rigid segment model during vibration. The target consists of a large circle and a small circle. The target is attached to the side of the model, and the center of the cross-section of the model is aligned with the cross mark in the target. An acquisition device, such as an industrial camera, for acquiring the target images of the target rigid segment model at multiple wind speeds is installed outside the wind tunnel test chamber. It is directed at the target position through the transparent glass for easy shooting of the target images. After the target rigid segment model enters a steady state under the influence of any wind speed, the industrial camera acquires multiple target images at multiple wind speeds according to the preset camera sampling frequency. Statistical parameter calculations are performed on the data of multiple target images, such as calculating the average value, and the statistical parameter results are used as the data in subsequent steps to improve the accuracy of the acquisition results.

[0036] Optionally, the target rigid segment model further includes a spring suspension system and a model body. The target is attached to the model body, and the center of the plane where the width and height of the model body are located coincides with the center of the target. The spring suspension system includes multiple springs, where the lower ends of some springs are connected to the upper end of the model body, and the upper ends of some springs are connected to the lower end of the model body to suspend the model body.

[0037] Specifically, Figure 3 is an example diagram of a target rigid segment model for the static three-component force coefficient determination method provided by this application. As Figure 3 shown, the spring suspension system includes 8 springs 1. The lower ends of 4 of the springs 1 are all connected to the upper end of the model body 2, and the upper ends of the other 4 springs 1 are all connected to the lower end of the model body 2 to suspend the model body 2. The model body 2 of the rigid segment model is obtained by reducing a long-span bridge according to a preset scale ratio. The target 3 is attached to the model body 2, and the center of the plane where the width and height of the model body 2 are located coincides with the center of the target 3.

[0038] Step 102, for each wind speed, determine the relative displacement of the target rigid segment model at the wind speed with respect to the target rigid segment model at the target wind speed according to the center positions of the first target circle and the second target circle in the target image.

[0039] Among them, the target wind speed can be set according to actual experimental requirements. For example, the target wind speed is 0.

[0040] Specifically, for each wind speed, determine the relative displacement of the target rigid segment model at the wind speed with respect to the target rigid segment model at the target wind speed according to the movement of the center positions of the first target circle and the second target circle relative to the target wind speed in the experiment, such as the movement relative to the wind speed of 0.

[0041] Optionally, before determining the relative displacement between the target rigid segment model and the target rigid segment model at the target wind speed based on the center positions of the first target circle and the second target circle in the target image, steps 21 to 22 may also be performed.

[0042] Step 21: Determine the diameters of the first target circle and the second target circle based on the target image.

[0043] Specifically, an edge detection algorithm is used to process the images collected at different wind speeds, and the diameters of the first target circle and the second target circle are obtained from the edge detection results of the first target circle and the second target circle.

[0044] Step 22: Determine the center positions of the first target circle and the second target circle based on the diameters of the first target circle and the second target circle.

[0045] Specifically, an edge detection algorithm is used to process the images collected at different wind speeds, and the center positions of the first target circle and the second target circle are obtained from the edge detection results of the first target circle and the second target circle.

[0046] Optionally, after performing steps 21 to 22, determining the relative displacement between the target rigid segment model and the target rigid segment model at the target wind speed based on the center positions of the first target circle and the second target circle in the target image can be achieved through steps 1021 to 1022.

[0047] Step 1021: Determine the pixel coordinates of the diameter of the first target circle, the pixel coordinates of the diameter of the second target circle, the pixel coordinates of the center of the first target circle, and the pixel coordinates of the center of the second target circle based on the diameter of the first target circle, the diameter of the second target circle, the center position of the first target circle, and the center position of the second target circle.

[0048] Step 1022: Determine the relative displacement between the target rigid segment model and the target rigid segment model at the target wind speed based on the pixel coordinates of the diameter of the first target circle, the pixel coordinates of the diameter of the second target circle, the pixel coordinates of the center of the first target circle, and the pixel coordinates of the center of the second target circle.

[0049] Specifically, the pixel coordinates are converted into physical coordinates through a preset proportional relationship between pixels and physical lengths to obtain the relative displacement time history of the model at each wind speed relative to the model at the target wind speed.

[0050] Optionally, step 1022 can be achieved through steps 221 to 222.

[0051] Step 221: Obtain the physical coordinates of the diameter of the first target circle, the physical coordinates of the diameter of the second target circle, the physical coordinates of the center of the first target circle, the physical coordinates of the center of the second target circle, and the unit length corresponding to the preset pixel based on the pixel coordinates of the diameter of the first target circle, the pixel coordinates of the diameter of the second target circle, the pixel coordinates of the center of the first target circle, the pixel coordinates of the center of the second target circle, and the unit length corresponding to the preset pixel.

[0052] Step 222: Determine the relative displacement between the target rigid segment model and the target rigid segment model under the target wind speed according to the physical coordinates of the diameter of the first target circle, the physical coordinates of the diameter of the second target circle, the physical coordinates of the center of the first target circle, and the physical coordinates of the center of the second target circle at the wind speed.

[0053] Exemplarily, edge detection processes each picture to obtain the edge pixel points of the first target circle and the second target circle, takes the maximum distance between the edge pixel points in the respective regions of the first target circle and the second target circle as the diameter, and takes the center of the two points with the maximum spacing as the center of the circle. The unit length corresponding to the preset pixel is the length for converting pixels to physical coordinates, that is, the actual length of each pixel. For example, 1 pixel length is 1 millimeter.

[0054] Step 103: Obtain the static three-component force coefficient of the target rigid segment model according to the relative displacement and the conversion relationship between displacement and force.

[0055] Specifically, the conversion relationship between displacement and force is the relationship between the displacement of the model and the force received by the model, which is obtained from the following conversion relationship. After obtaining the relative displacement, split the relative displacement into lateral displacement, longitudinal displacement, and angular displacement. According to the relative displacement and the conversion relationship between displacement and force, the lateral component force corresponding to the lateral displacement can be obtained, and then the drag coefficient of the target rigid segment model can be obtained. Obtain the longitudinal component force corresponding to the displacement, and then obtain the lift coefficient of the target rigid segment model. Obtain the torque corresponding to the angular displacement, and then obtain the torque coefficient of the target rigid segment model.

[0056] The determination process of the conversion relationship between displacement and force is as follows: In the exemplary diagram of the target rigid segment model as shown in Figure 3 , the lateral displacement, longitudinal displacement, and angular displacement after the model undergoes displacement are respectively , , . Since the two sides of the model are regarded as undergoing displacement simultaneously when the model undergoes displacement, only the displacement of one side needs to be considered. For the 4 springs used for single-side suspension, let be the original length of the spring, be the stiffness of one spring, , , , They are the total lengths after static stretching of the left upper suspension, right upper suspension, left lower suspension, and right lower suspension springs respectively. 、 、 、 They are the total suspension lengths of the left upper suspension, right upper suspension, left lower suspension, and right lower suspension respectively. 、 、 、 They are the deformation amounts after static stretching of the left upper suspension, right upper suspension, left lower suspension, and right lower suspension springs respectively. 、 、 、 They are the total suspension lengths of the left upper suspension, right upper suspension, left lower suspension, and right lower suspension without considering the spring deformation amounts respectively. 、 、 、 、 、 、 、 As shown in Formula 1,

[0057] Formula 1

[0058] In the example diagram of the target rigid segment model as shown in Figure 3 , that is, for the 4 springs used on one side of the suspension, 、 、 、 They are the lateral displacements that occur in the plane of the four suspension points on one side respectively, 、 、 、 They are the longitudinal displacements that occur in the plane of the four suspension points on one side respectively. 、 、 、 、 、 、 、 They can be expressed by Formulas 2 to 5.

[0059] Formula 2

[0060] Formula 3

[0061] Formula 4

[0062] Formula 5

[0063] Among them, represents the distance between the left and right suspensions, represents the distance between the upper and lower suspensions.

[0064] The process of obtaining the displacement-force conversion relationship of the springs at the four suspension points on one side is shown in Formulas 6 to 10.

[0065] Formula 6

[0066] Formula 7

[0067] Formula 8

[0068] Formula 9

[0069] Formula 10

[0070] Among them, , , , are the forces of the springs on the four sides on one side after displacement respectively, , , , are the angles with the vertical direction of the springs on the four sides on one side after displacement respectively. , , , are the vertical change component forces of the springs on the four sides on one side after displacement respectively; , , , are the horizontal change component forces of the springs on the four sides on one side after displacement respectively. , , , are the torques of the springs on the four sides on one side on the center point of the model after displacement respectively. , , are the longitudinal component force, the horizontal component force and the torque corresponding to the displacement respectively after the model is displaced.

[0071] In the solution of this application, after the target rigid segment model reaches a steady state, target images of the target rigid segment model at multiple wind speeds are collected; wherein, the targets of the target rigid segment model include a first target circle, a second target circle, and a cross mark, the cross mark is located at the center of the target, the distance between the center of the first target circle and the center of the target is equal to the distance between the center of the second target circle and the center of the target, and the radius of the first target circle is greater than the radius of the second target circle; for each wind speed, according to the center positions of the first target circle and the second target circle in the target image, the relative displacement of the target rigid segment model at the wind speed with respect to the target rigid segment model at the target wind speed is determined; according to the relative displacement and the conversion relationship between displacement and force, the static three-component force coefficient of the target rigid segment model is obtained. That is, in the solution of this application, the relative displacement of the target rigid segment model is determined based on the image, and the static three-component force coefficient of the target rigid segment model is determined according to the relative displacement information, thereby avoiding the use of a high-precision force measuring balance to determine the static three-component force coefficient, reducing the experimental cost, and reducing the installation difficulty of the experiment. It is not necessary to repeatedly obtain the static three-component force coefficient through a high-precision force measuring balance in repeated wind tunnel tests, thereby improving the experimental efficiency.

[0072] Figure 2 is another schematic flowchart of the method for determining the static three-component force coefficient provided by this application. In this embodiment, based on the Figure 1 illustrated embodiment and various optional implementation solutions, the steps of obtaining the static three-component force coefficient of the target rigid segment model are described in detail. As Figure 2 shown, the method may include the following steps:

[0073] Step 201, after the target rigid segment model reaches a steady state, collect target images of the target rigid segment model at multiple wind speeds.

[0074] Step 202, for each wind speed, according to the center positions of the first target circle and the second target circle in the target image, determine the relative displacement of the target rigid segment model at the wind speed with respect to the target rigid segment model at the target wind speed.

[0075] Step 203, determine the relative lateral displacement, relative longitudinal displacement, and relative angular displacement according to the relative displacement.

[0076] Exemplarily, the relative displacement represented in pixels is split into a relative lateral displacement , a relative longitudinal displacement , and a relative angular displacement . The relative lateral displacement, relative longitudinal displacement, and relative angular displacement , , represented in physical length can be as shown in 11.

[0077] Formula 11

[0078] wherein, is the physical size of each pixel. Exemplarily, the physical size of a pixel is 0.1 mm.

[0079] Step 204: Obtain the drag coefficient of the target rigid segment model according to the relative lateral displacement and the conversion relationship between displacement and force.

[0080] Optionally, obtain the lateral component force that changes after displacement of the target rigid segment model according to the relative lateral displacement and the conversion relationship between displacement and force, and obtain the drag coefficient of the target rigid segment model according to the lateral component force, the preset air density, the wind speed, and the model parameters of the target rigid segment model.

[0081] Specifically, after obtaining the relative lateral displacement, according to the relative lateral displacement and the conversion relationship between displacement and force, the lateral component force corresponding to the relative lateral displacement when the model can have such a lateral displacement can be obtained. Then, obtain the drag coefficient of the target rigid segment model according to the lateral component force, the preset air density, the wind speed, and the model parameters of the target rigid segment model. The model parameters of the target rigid segment model include the length, width, and height of the target rigid segment model.

[0082] Exemplarily, obtaining the drag coefficient of the target rigid segment model according to the lateral component force, the preset air density, the wind speed, and the model parameters of the target rigid segment model can be achieved through Formula 12.

[0083] Formula 12

[0084] wherein, is the drag coefficient, is the lateral component force, is the air density, usually 1.25 Kg / m 3 , is the wind speed, is the height of the model, is the length of the model.

[0085] Step 205: Obtain the lift coefficient of the target rigid segment model according to the relative longitudinal displacement and the conversion relationship between displacement and force.

[0086] Optionally, obtain the longitudinal component force that changes after displacement of the target rigid segment model according to the relative longitudinal displacement and the conversion relationship between displacement and force, and obtain the lift coefficient of the target rigid segment model according to the longitudinal component force, the preset air density, the wind speed, and the model parameters of the target rigid segment model.

[0087] Specifically, after obtaining the relative longitudinal displacement, according to the relative longitudinal displacement and the conversion relationship between displacement and force, the longitudinal component force corresponding to the relative longitudinal displacement when the model can generate such longitudinal displacement can be obtained. Then, according to the longitudinal component force, the preset air density, the wind speed, and the model parameters of the target rigid segment model, the lift coefficient of the target rigid segment model can be obtained.

[0088] Exemplarily, obtaining the lift coefficient of the target rigid segment model according to the longitudinal component force, the preset air density, the wind speed, and the model parameters of the target rigid segment model can be achieved through Formula 13.

[0089] Formula 13

[0090] Wherein, is the lift coefficient, is the longitudinal component force, is the air density, usually 1.25 Kg / m 3 , is the wind speed, is the width of the model, is the length of the model.

[0091] Step 206: Obtain the moment coefficient of the target rigid segment model according to the relative angular displacement and the conversion relationship between displacement and force.

[0092] Optionally, obtain the moment that changes after displacement of the target rigid segment model according to the relative angular displacement and the conversion relationship between displacement and force, and obtain the moment coefficient of the target rigid segment model according to the moment, the preset air density, the wind speed, and the model parameters of the target rigid segment model.

[0093] Specifically, after obtaining the relative angular displacement, according to the relative angular displacement and the conversion relationship between displacement and force, the moment corresponding to the relative angular displacement when the model can generate such angular displacement can be obtained. Then, according to the moment, the preset air density, the wind speed, and the model parameters of the target rigid segment model, the moment coefficient of the target rigid segment model can be obtained.

[0094] Exemplarily, obtaining the moment coefficient of the target rigid segment model according to the moment, the preset air density, the wind speed, and the model parameters of the target rigid segment model can be achieved through Formula 14.

[0095] Formula 14

[0096] Wherein, is the moment coefficient, is the moment, is the air density, usually 1.25 Kg / m 3 , is the wind speed, is the height of the model, is the width of the model.

[0097] According to the solution of this application, the static three-component force coefficient of the target rigid segment model is obtained based on the lateral component force, longitudinal component force, moment, preset air density, wind speed, and model parameters of the target rigid segment model, which refines the determination method of the static three-component force coefficient, further improves the accuracy of the static three-component force coefficient, thereby further reducing the experimental cost and the installation difficulty of experimental equipment, and further improving the experimental efficiency.

[0098] Figure 4 is a schematic structural diagram of an aerodynamic force determination device provided by this application, and this device is applicable to execute the aerodynamic force determination method provided by this application. As Figure 4 shown, this device may specifically include:

[0099] An acquisition module 301, configured to acquire target images of the target rigid segment model at multiple wind speeds after the target rigid segment model reaches a steady state; wherein, the targets of the target rigid segment model include a first target circle, a second target circle, and a cross mark, the cross mark is located at the center of the target, the distance between the center of the first target circle and the center of the target is equal to the distance between the center of the second target circle and the center of the target, and the radius of the first target circle is greater than the radius of the second target circle.

[0100] A displacement determination module 302, configured to, for each wind speed, determine the relative displacement between the target rigid segment model and the target rigid segment model at the target wind speed according to the center positions of the first target circle and the second target circle in the target image.

[0101] A coefficient determination module 303, configured to obtain the static three-component force coefficient of the target rigid segment model according to the relative displacement and the conversion relationship between displacement and force.

[0102] In an embodiment, the device further includes: a center determination module, configured to, before the displacement determination module 302 determines the relative displacement between the target rigid segment model and the target rigid segment model at the target wind speed according to the center positions of the first target circle and the second target circle in the target image, determine the diameters of the first target circle and the second target circle according to the target image; and determine the center positions of the first target circle and the second target circle according to the diameters of the first target circle and the second target circle.

[0103] In one embodiment, the displacement determination module 302 is specifically configured to: determine the pixel coordinates of the diameter of the first target circle, the pixel coordinates of the diameter of the second target circle, the pixel coordinates of the center of the first target circle, and the pixel coordinates of the center of the second target circle according to the diameter of the first target circle, the diameter of the second target circle, the center position of the first target circle, and the center position of the second target circle; determine the relative displacement between the target rigid segment model and the target rigid segment model at the target wind speed according to the pixel coordinates of the diameter of the first target circle, the pixel coordinates of the diameter of the second target circle, the pixel coordinates of the center of the first target circle, and the pixel coordinates of the center of the second target circle.

[0104] In one embodiment, when the displacement determination module 302 determines the relative displacement between the target rigid segment model and the target rigid segment model at the target wind speed according to the pixel coordinates of the diameter of the first target circle, the pixel coordinates of the diameter of the second target circle, the pixel coordinates of the center of the first target circle, and the pixel coordinates of the center of the second target circle, it is specifically configured to: obtain the physical coordinates of the diameter of the first target circle, the physical coordinates of the diameter of the second target circle, the physical coordinates of the center of the first target circle, and the physical coordinates of the center of the second target circle according to the pixel coordinates of the diameter of the first target circle, the pixel coordinates of the diameter of the second target circle, the pixel coordinates of the center of the first target circle, the pixel coordinates of the center of the second target circle, and the preset unit length corresponding to the pixel; determine the relative displacement between the target rigid segment model and the target rigid segment model at the target wind speed according to the physical coordinates of the diameter of the first target circle, the physical coordinates of the diameter of the second target circle, the physical coordinates of the center of the first target circle, and the physical coordinates of the center of the second target circle.

[0105] In one embodiment, the static three-component force coefficient includes a drag coefficient, a lift coefficient, and a moment coefficient. The coefficient determination module 303 is further configured to: before obtaining the static three-component force coefficient of the target rigid segment model according to the relative displacement and the conversion relationship between displacement and force, determine the relative lateral displacement, the relative longitudinal displacement, and the relative angular displacement according to the relative displacement; the coefficient determination module 303 is specifically configured to: obtain the drag coefficient of the target rigid segment model according to the relative lateral displacement and the conversion relationship between displacement and force; obtain the lift coefficient of the target rigid segment model according to the relative longitudinal displacement and the conversion relationship between displacement and force; obtain the moment coefficient of the target rigid segment model according to the relative angular displacement and the conversion relationship between displacement and force.

[0106] In one embodiment, the coefficient determination module 303 is specifically configured to obtain the drag coefficient of the target rigid segment model based on the relative lateral displacement and the displacement-force conversion relationship as follows: obtain the lateral component force that changes after displacement of the target rigid segment model according to the relative lateral displacement and the displacement-force conversion relationship, and obtain the drag coefficient of the target rigid segment model based on the lateral component force, the preset air density, the wind speed, and the model parameters of the target rigid segment model; the coefficient determination module 303 is specifically configured to obtain the lift coefficient of the target rigid segment model based on the relative longitudinal displacement and the displacement-force conversion relationship as follows: obtain the longitudinal component force that changes after displacement of the target rigid segment model according to the relative longitudinal displacement and the displacement-force conversion relationship, and obtain the lift coefficient of the target rigid segment model based on the longitudinal component force, the preset air density, the wind speed, and the model parameters of the target rigid segment model; the coefficient determination module 303 is specifically configured to obtain the moment coefficient of the target rigid segment model based on the relative angular displacement and the displacement-force conversion relationship as follows: obtain the moment that changes after displacement of the target rigid segment model according to the relative angular displacement and the displacement-force conversion relationship, and obtain the moment coefficient of the target rigid segment model based on the moment, the preset air density, the wind speed, and the model parameters of the target rigid segment model.

[0107] In one embodiment, the target rigid segment model further includes a spring suspension system and a model body; the target is attached to the model body, and the center of the plane where the width and height of the model body are located coincides with the center of the target; the spring suspension system includes a plurality of springs, wherein the lower ends of some springs are connected to the upper end of the model body, and the upper ends of some springs are connected to the lower end of the model body to suspend the model body.

[0108] For the device of the present application, after the target rigid segment model reaches a steady state, target images of the target rigid segment model are collected at multiple wind speeds; wherein, the target of the target rigid segment model includes a first target circle, a second target circle, and a cross mark, the cross mark is located at the center of the target, the distance between the center of the first target circle and the center of the target is equal to the distance between the center of the second target circle and the center of the target, and the radius of the first target circle is greater than the radius of the second target circle; for each wind speed, according to the center positions of the first target circle and the second target circle in the target image, the relative displacement of the target rigid segment model at the wind speed and the target rigid segment model at the target wind speed is determined; according to the relative displacement and the conversion relationship between displacement and force, the static three-component force coefficient of the target rigid segment model is obtained. That is, the solution of the present application determines the relative displacement of the target rigid segment model according to the image, and determines the static three-component force coefficient of the target rigid segment model according to the relative displacement information, thereby avoiding using a high-precision force balance to determine the static three-component force coefficient, reducing the experimental cost, and reducing the installation difficulty of the experiment. It is not necessary to repeatedly obtain the static three-component force coefficient through a high-precision force balance in repeated wind tunnel tests, thereby improving the experimental efficiency.

[0109] The present application also provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the method for determining the static three-component force coefficient provided in any of the above embodiments is implemented.

[0110] The present application also provides a computer-readable medium, on which a computer program is stored. When the program is executed by a processor, the method for determining the static three-component force coefficient provided in any of the above embodiments is implemented.

[0111] Reference is made below Figure 5 , which shows a schematic structural diagram of an electronic device 400 suitable for implementing the present application. Figure 5 The electronic device shown is only an example and should not impose any limitation on the functions and usage scope of the present application.

[0112] As Figure 5 shown, the electronic device 400 includes a central processing unit (CPU) 401, which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 402 or the program loaded from the storage part 408 into the random access memory (RAM) 403. In the RAM 403, various programs and data required for the operation of the electronic device 400 are also stored. The CPU 401, ROM 402, and RAM 403 are connected to each other through a bus 404. The input / output (I / O) interface 405 is also connected to the bus 404.

[0113] The following components are connected to the I / O interface 405: an input section 406 including a keyboard, a mouse, etc.; an output section 407 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc. and a speaker, etc.; a storage section 408 including a hard disk, etc.; and a communication section 409 including a network interface card such as a LAN card, a modem, etc. The communication section 409 performs communication processing via a network such as the Internet. A drive 410 is also connected to the I / O interface 405 as needed. A removable medium 411 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc. is mounted on the drive 410 as needed so that a computer program read therefrom is installed into the storage section 408 as needed.

[0114] Specifically, according to the embodiments disclosed in the present application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, the embodiments disclosed in the present application include a computer program product that includes a computer program carried on a computer-readable medium, and the computer program includes program codes for performing the methods shown in the flowcharts. In such an embodiment, the computer program can be downloaded and installed from a network via the communication section 409, and / or installed from the removable medium 411. When the computer program is executed by a central processing unit (CPU) 401, the above-described functions defined in the system of the present application are performed.

[0115] It should be noted that the computer-readable medium shown in this application can be a computer-readable signal medium, a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples of a computer-readable storage medium can include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this application, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In this application, a computer-readable signal medium can include a data signal propagated in a baseband or as part of a carrier wave, which carries computer-readable program code. Such a propagated data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on a computer-readable medium can be transmitted using any appropriate medium, including but not limited to: wireless, wire, optical fiber, RF, etc., or any suitable combination of the above.

[0116] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram can represent a module, a program segment, or a part of code that contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks can occur in a different order than marked in the accompanying drawings. For example, two consecutive blocks shown can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or operations, or by a combination of dedicated hardware and computer instructions.

[0117] The modules and / or units involved in this application can be implemented in software or in hardware. The described modules and / or units can also be provided in a processor. For example, it can be described as: A processor includes an acquisition module, a displacement determination module, and a coefficient determination module. Among them, the names of these modules do not constitute a limitation to the module itself in some cases.

[0118] As another aspect, this application also provides a computer-readable medium, which can be included in the device described in the above embodiments; or it can exist alone without being assembled into the device. The above computer-readable medium carries one or more programs. When the above one or more programs are executed by a device, the device is caused to perform the following operations:

[0119] After the target rigid segment model reaches a steady state, acquire the target images of the target rigid segment model at multiple wind speeds; wherein, the target of the target rigid segment model includes a first target circle, a second target circle, and a cross mark. The cross mark is located at the center of the target. The distance between the center of the first target circle and the center of the target is equal to the distance between the center of the second target circle and the center of the target, and the radius of the first target circle is greater than the radius of the second target circle; for each wind speed, according to the center positions of the first target circle and the second target circle in the target image, determine the relative displacement of the target rigid segment model at the wind speed with respect to the target rigid segment model at the target wind speed; obtain the static three-component force coefficient of the target rigid segment model according to the relative displacement and the conversion relationship between displacement and force.

[0120] According to the technical solution of this application, after the target rigid segment model reaches a steady state, acquire the target images of the target rigid segment model at multiple wind speeds; wherein, the target of the target rigid segment model includes a first target circle, a second target circle, and a cross mark. The cross mark is located at the center of the target. The distance between the center of the first target circle and the center of the target is equal to the distance between the center of the second target circle and the center of the target, and the radius of the first target circle is greater than the radius of the second target circle; for each wind speed, according to the center positions of the first target circle and the second target circle in the target image, determine the relative displacement of the target rigid segment model at the wind speed with respect to the target rigid segment model at the target wind speed; obtain the static three-component force coefficient of the target rigid segment model according to the relative displacement and the conversion relationship between displacement and force. That is, the solution of this application determines the relative displacement of the target rigid segment model according to the image, and determines the static three-component force coefficient of the target rigid segment model according to the relative displacement information, thereby avoiding using a high-precision force measuring balance to determine the static three-component force coefficient, reducing the experimental cost, reducing the installation difficulty of the experiment, and not requiring repeatedly obtaining the static three-component force coefficient through a high-precision force measuring balance in repeated wind tunnel tests, thus improving the experimental efficiency.

[0121] An embodiment of this application also provides a computer program product, including a computer program which, when executed by a processor, implements the static three-component force coefficient determination method provided in any embodiment of this application.

[0122] In the process of implementing the computer program product, computer program code for performing the operations of this application can be written in one or more programming languages or combinations thereof. The programming languages include object-oriented programming languages such as Java, Smalltalk, and C++, and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, executed as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network - including a local area network (LAN) or a wide area network (WAN) - or can be connected to an external computer (for example, by using an Internet service provider to connect through the Internet).

[0123] It should be understood that the various forms of the processes shown above can be used, steps can be reordered, added, or deleted. For example, the steps described in this application can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of this application can be achieved, and no limitations are imposed herein.

[0124] Although the present invention has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any manner. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for determining static three-component force coefficients, characterized in that, The method includes: After the target rigid segment model reaches a steady state, acquiring target images of the target rigid segment model at multiple wind speeds; wherein, the targets of the target rigid segment model include a first target circle, a second target circle, and a cross mark, the cross mark is located at the center of the target, the distance between the center of the first target circle and the center of the target is equal to the distance between the center of the second target circle and the center of the target, and the radius of the first target circle is greater than the radius of the second target circle; wherein, the target rigid segment model further includes a spring suspension system and a model body; the target is attached to the model body, and the center of the plane where the width and height of the model body are located coincides with the center of the target; the spring suspension system includes a plurality of springs, and the lower ends of some of the springs are connected to the upper end of the model body, and the upper ends of some of the springs are connected to the lower end of the model body to suspend the model body; For each wind speed, determine the relative displacement of the target rigid segment model at the wind speed with respect to the target rigid segment model at the target wind speed according to the center positions of the first target circle and the second target circle in the target image; Obtain the static three-component force coefficient of the target rigid segment model according to the relative displacement of the target rigid segment model and the conversion relationship between the displacement and force of the spring suspension system; wherein, obtaining the static three-component force coefficient of the target rigid segment model according to the relative displacement of the target rigid segment model and the conversion relationship between the displacement and force of the spring suspension system includes: decomposing the relative displacement of the target segment model into the displacement on the spring, and then calculating the vertical change force, the lateral change force of the spring after the spring undergoes displacement, and the moment of the spring on the center point of the model, obtaining the longitudinal force, the lateral force, and the moment corresponding to the displacement after the model undergoes displacement, and then calculating the static three-component force coefficient.

2. The method according to claim 1, wherein Before determining the relative displacement of the target rigid segment model at the wind speed with respect to the target rigid segment model at the target wind speed according to the center positions of the first target circle and the second target circle in the target image, the method further includes: Determine the diameter of the first target circle and the diameter of the second target circle according to the target image; Determine the center position of the first target circle and the center position of the second target circle according to the diameter of the first target circle and the diameter of the second target circle.

3. The method according to claim 2, wherein Determining the relative displacement of the target rigid segment model at the wind speed with respect to the target rigid segment model at the target wind speed according to the center positions of the first target circle and the second target circle in the target image includes: Determine the pixel coordinates of the diameter of the first target circle, the pixel coordinates of the diameter of the second target circle, the pixel coordinates of the center of the first target circle, and the pixel coordinates of the center of the second target circle according to the diameter of the first target circle, the diameter of the second target circle, the center position of the first target circle, and the center position of the second target circle; Determine the relative displacement between the target rigid segment model and the target rigid segment model under the target wind speed according to the pixel coordinates of the diameter of the first target circle, the pixel coordinates of the diameter of the second target circle, the pixel coordinates of the center of the first target circle, and the pixel coordinates of the center of the second target circle.

4. The method according to claim 3, characterized in that, The step of determining the relative displacement between the target rigid segment model and the target rigid segment model under the target wind speed according to the pixel coordinates of the diameter of the first target circle, the pixel coordinates of the diameter of the second target circle, the pixel coordinates of the center of the first target circle, and the pixel coordinates of the center of the second target circle includes: Obtain the physical coordinates of the diameter of the first target circle, the physical coordinates of the diameter of the second target circle, the physical coordinates of the center of the first target circle, and the physical coordinates of the center of the second target circle according to the pixel coordinates of the diameter of the first target circle, the pixel coordinates of the diameter of the second target circle, the pixel coordinates of the center of the first target circle, the pixel coordinates of the center of the second target circle, and the preset unit length corresponding to the pixel. Determine the relative displacement between the target rigid segment model and the target rigid segment model under the target wind speed according to the physical coordinates of the diameter of the first target circle, the physical coordinates of the diameter of the second target circle, the physical coordinates of the center of the first target circle, and the physical coordinates of the center of the second target circle.

5. The method according to claim 1, wherein The static three-component force coefficient includes a drag coefficient, a lift coefficient, and a moment coefficient. Before obtaining the static three-component force coefficient of the target rigid segment model according to the relative displacement and the conversion relationship between displacement and force, the method further includes: Determine the relative lateral displacement, relative longitudinal displacement, and relative angular displacement according to the relative displacement. The step of obtaining the static three-component force coefficient of the target rigid segment model according to the relative displacement and the conversion relationship between displacement and force includes: Obtain the drag coefficient of the target rigid segment model according to the relative lateral displacement and the conversion relationship between displacement and force. Obtain the lift coefficient of the target rigid segment model according to the relative longitudinal displacement and the conversion relationship between displacement and force. Obtain the moment coefficient of the target rigid segment model according to the relative angular displacement and the conversion relationship between displacement and force.

6. The method according to claim 5, characterized in that, The step of obtaining the drag coefficient of the target rigid segment model according to the relative lateral displacement and the conversion relationship between displacement and force includes: Obtain the lateral component force changed after displacement of the target rigid segment model according to the relative lateral displacement and the conversion relationship between displacement and force, and obtain the drag coefficient of the target rigid segment model according to the lateral component force, the preset air density, the wind speed, and the model parameters of the target rigid segment model. The step of obtaining the lift coefficient of the target rigid segment model according to the relative longitudinal displacement and the conversion relationship between displacement and force includes: Obtain the longitudinal component force that changes after displacement of the target rigid segment model based on the relative longitudinal displacement and the conversion relationship between displacement and force, and obtain the lift coefficient of the target rigid segment model based on the longitudinal component force that changes after displacement of the target rigid segment model, the preset air density, the wind speed, and the model parameters of the target rigid segment model; The obtaining the moment coefficient of the target rigid segment model according to the relative angular displacement and the conversion relationship between displacement and force includes: Obtain the moment that changes after displacement of the target rigid segment model based on the relative angular displacement and the conversion relationship between displacement and force, and obtain the moment coefficient of the target rigid segment model based on the moment, the preset air density, the wind speed, and the model parameters of the target rigid segment model.

7. A static three-component force coefficient determination device, characterized in that The device includes: An acquisition module, configured to acquire target images of the target rigid segment model at multiple wind speeds after the target rigid segment model reaches a steady state; wherein, the target of the target rigid segment model includes a first target circle, a second target circle, and a cross mark, the cross mark is located at the center of the target, the distance between the center of the first target circle and the center of the target is equal to the distance between the center of the second target circle and the center of the target, and the radius of the first target circle is greater than the radius of the second target circle; wherein, the target rigid segment model further includes a spring suspension system and a model body; the target is attached to the model body, and the center of the plane where the width and height of the model body are located coincides with the center of the target; the spring suspension system includes a plurality of springs, and the lower ends of some of the springs are connected to the upper end of the model body, and the upper ends of some of the springs are connected to the lower end of the model body to suspend the model body; A displacement determination module, configured to, for each wind speed, determine the relative displacement of the target rigid segment model at the wind speed and the target rigid segment model at the target wind speed based on the center positions of the first target circle and the second target circle in the target image; A coefficient determination module, configured to obtain the static three-component force coefficient of the target rigid segment model according to the relative displacement of the target rigid segment model and the conversion relationship between displacement and force of the spring suspension system; wherein, obtaining the static three-component force coefficient of the target rigid segment model according to the relative displacement of the target rigid segment model and the conversion relationship between displacement and force of the spring suspension system includes: decomposing the relative displacement of the target segment model into the displacement on the spring, and then calculating the vertical change component force, the horizontal change component force of the spring after the spring undergoes displacement, and the moment of the spring on the center point of the model, obtaining the longitudinal component force, the horizontal component force, and the moment corresponding to the displacement after the model undergoes displacement, and then calculating the static three-component force coefficient.

8. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the static three-component force coefficient determination method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the static three-component force coefficient determination method according to any one of claims 1 to 6.

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