CN111999030A - Three-dimensional oil flow VR (virtual reality) online measurement and display system and working method thereof - Google Patents
Three-dimensional oil flow VR (virtual reality) online measurement and display system and working method thereof Download PDFInfo
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Abstract
The invention discloses a three-dimensional oil flow VR online measuring and displaying system and a working method thereof, wherein the system comprises a hardware system and a software system matched with the hardware system; the hardware system comprises a data acquisition subsystem, a data transmission subsystem, a test interaction display subsystem and a three-dimensional graphic workstation; the software system comprises a synchronization and data acquisition module, an oil flow calculation module, a real-time three-dimensional drawing calculation module, a three-dimensional modeling and rendering module and an interactive control and display module. The three-dimensional graphic workstation divides the display of the whole test into two stages, namely a three-dimensional real-time display stage and a three-dimensional modeling display stage. In the three-dimensional real-time display stage, a virtual viewpoint drawing technology is adopted, so that the real-time performance can be met; and in the three-dimensional modeling display stage, an offline modeling mode is adopted, so that the comprehensive and accurate information can be achieved, and the three-dimensional target model is displayed to be fine and attractive.
Description
Technical Field
The invention relates to the technical field of oil flow tests, in particular to a three-dimensional oil flow VR online measurement and display system and a working method thereof.
Background
The oil flow method is an important means for solving the practical engineering problem as the most traditional and important surface friction stress display and measurement technology in flow display. In the basic research of the modern hydrodynamics and aerodynamics, the surface friction stress distribution is the best way to describe the state of a turbulent boundary layer and is also one of the most important physical quantities for describing the state of the turbulent boundary layer; in fluid mechanics, people have limited knowledge about the problems of unsteady flow, turbulence and the like of the gas flow, however, the solution of the problems is particularly important and urgent in practical engineering application, so that the flow velocity and flow field display based on the oil flow method is very important.
At present, an oil flow method is adopted in a wind tunnel to carry out a measurement test of the friction stress of the surface of a target, and a method of post observation is generally adopted, namely, the distribution result of the oil flow of the surface of the target is observed after blowing is finished. Since the test result is not real-time data, but the accumulated (time integration) result of different stages of the variable airflow acting on the target surface. This makes it necessary to run different batches of tests when the target needs to measure the surface airflow conditions at different angles of attack and at different wind speeds. Although the above problems can be solved by video recording, the image pickup apparatus is affected by many problems such as viewpoint, view angle, view field and environment obstruction, so that the acquired image information is not complete, especially for the target with complex form, and it is difficult to accurately and truly reflect the target surface flow field distribution information.
With the development of the computational vision technology, the real-time three-dimensional modeling and rendering display technology is gradually mature. By utilizing the technology, the real-time three-dimensional display is carried out on the related tests such as wind tunnel oil flow blowing and the like and the process thereof, and the omnibearing observation of the target blowing test process in the wind tunnel from different angles is realized, so that the difficulty and the defect of the current wind tunnel test are effectively overcome. However, since the 3D display requires operations such as image matching, depth map calculation, point cloud acquisition, three-dimensional modeling, and model rendering, the amount of calculation is huge, and although the technology is mature, the modeling is difficult, the complexity is high, the real-time performance is poor, the reality of modeling is not good, and there are many limitations and deficiencies in the application, which results in low rendering efficiency and poor real-time interactivity in the actual three-dimensional display.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the existing problems, a three-dimensional oil flow VR online measuring and displaying system and a working method thereof are provided.
The invention provides a three-dimensional oil flow VR online measuring and displaying system, which comprises a hardware system and a software system matched with the hardware system; the hardware system comprises a data acquisition subsystem, a data transmission subsystem, a test interaction display subsystem and a three-dimensional graphic workstation; the software system comprises a synchronization and data acquisition module, an oil flow calculation module, a real-time three-dimensional drawing calculation module, a three-dimensional modeling and rendering module and an interactive control and display module;
the data transmission subsystem is used for realizing data transmission among the data acquisition subsystem, the three-dimensional graphic workstation and the test interaction display subsystem;
the data acquisition subsystem and the synchronization and data acquisition module are used for synchronously acquiring two-dimensional images and three-dimensional point cloud data from different viewpoints for a test target and surface oil flow in the wind tunnel;
the three-dimensional graphic workstation is used for receiving the collected two-dimensional image and three-dimensional point cloud data through the data transmission subsystem; in the three-dimensional graphic workstation, the oil flow calculation module is used for calculating an oil flow field, the real-time three-dimensional drawing calculation module is used for drawing a three-dimensional image of a test target and surface oil flow in real time, and the three-dimensional modeling and rendering module is used for constructing a target three-dimensional model with enhanced oil flow field calculation result data;
the test interaction display subsystem and the interaction control and display module are used for receiving and displaying the three-dimensional images and/or the target three-dimensional models generated by the three-dimensional graphic workstation through the data transmission subsystem, and are used for man-machine interaction control of the three-dimensional oil flow VR online measurement and display system.
Further, the data acquisition subsystem comprises a plurality of visible light cameras, a TOF depth camera and a synchronous controller; the plurality of visible light cameras and the TOF depth camera are arranged at different viewpoints, and a test target in the wind tunnel is completely covered by the visual fields of the visible light cameras and the TOF depth camera; the synchronous controller is combined with the control of the synchronization and data acquisition module to realize the synchronous control of the plurality of visible light cameras and the TOF depth camera.
Further, the visible light camera and the TOF depth camera are arranged in pairs, each pair of the visible light camera and the TOF depth camera is arranged in close proximity, each pair of the visible light camera and the TOF depth camera is arranged at different viewpoints, and the test object in the wind tunnel is completely covered by the visual fields of the visible light camera and the TOF depth camera.
Further, the software system also comprises a system calibration module; the system calibration module is used for calibrating parameters of the visible light camera and the TOF depth camera and moving the coordinate systems of the visible light camera and the TOF depth camera to the same coordinate system.
Furthermore, the data transmission subsystem comprises a wireless router and a high-speed data transmission line and is used for realizing wired and/or wireless connection among the data acquisition subsystem, the test interaction display subsystem and the three-dimensional graphic workstation.
Furthermore, the test interaction display subsystem comprises one or more interactive display devices selected from a tablet personal computer, an LED display large screen, a workstation display screen and a holographic projection device.
Furthermore, the three-dimensional graphic workstation and the workstation display screen are realized by a computer with a display screen.
The invention also provides a working method of the three-dimensional oil flow VR online measuring and displaying system, which comprises the following steps:
the data transmission subsystem is adopted to realize data transmission among the data acquisition subsystem, the three-dimensional graphic workstation and the test interaction display subsystem;
synchronously acquiring two-dimensional images and three-dimensional point cloud data from different viewpoints for a test target and a surface oil flow in the wind tunnel by adopting a data acquisition subsystem and a synchronization and data acquisition module;
adopting a three-dimensional graphic workstation to receive the acquired two-dimensional image and three-dimensional point cloud data through a data transmission subsystem, and carrying out corresponding operation based on the acquired two-dimensional image and three-dimensional point cloud data: (1) calculating an oil flow field through an oil flow calculation module; (2) a real-time three-dimensional drawing calculation module is used for drawing a three-dimensional image of a test target and surface oil flow in real time by using a virtual viewpoint drawing technology; (3) through a three-dimensional modeling and rendering module, under the non-real-time condition after the test is finished, the three-dimensional modeling of a test target and surface oil flow is realized in an off-line mode, model rendering is carried out after oil flow field calculation results are overlapped, and a target three-dimensional model with enhanced oil flow field calculation result data is obtained;
and a test interactive display subsystem and an interactive control and display module are adopted to receive and display the three-dimensional images and/or the target three-dimensional models generated by the three-dimensional graphic workstation through a data transmission subsystem, and the man-machine interactive control of the three-dimensional oil flow VR online measurement and display system is realized.
Further, in the method for calculating the oil flow field by the oil flow calculation module, the flow field curve is drawn and the friction line is extracted by the following steps:
s1, acquiring K sequence diagrams from the shot two-dimensional images;
s2, performing brightness equalization on the K sequence charts;
s3, performing stripe graph processing on the K sequence graphs;
s4, extracting skeleton lines from the K sequence charts processed by the S2 and the S3;
s5, averaging the skeleton lines of the K sequence charts to obtain skeleton line splines;
s6, performing curve fitting on the skeleton line spline;
s7, then carrying out discrete point sampling on the skeleton line;
s8, performing flow field vector calculation on the sequence diagram processed by the S2 by using a discrete point sampling result and adopting a cross-correlation algorithm;
and S9, drawing a flow field curve by adopting a line convolution integral to the flow field vector obtained by calculation and extracting a friction force line.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the three-dimensional graphic workstation divides the display of the whole test into two stages, namely a three-dimensional real-time display stage and a three-dimensional modeling display stage. In the three-dimensional real-time display stage, a virtual viewpoint drawing technology is adopted, so that the real-time performance can be met; and in the three-dimensional modeling display stage, an offline modeling mode is adopted, so that the comprehensive and accurate information can be achieved, and the three-dimensional target model is displayed to be fine and attractive.
2. The test interaction display subsystem comprises one or more interactive display devices of a tablet personal computer, an LED display large screen, a workstation display screen and a holographic projection device, so that the whole test process is accurate in information display, attractive in display and convenient to operate.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a block diagram of a three-dimensional oil flow VR online measurement and display system according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a hardware system in the three-dimensional oil flow VR online measurement and display system according to the embodiment of the invention.
Fig. 3 is a schematic layout diagram of a data acquisition subsystem according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a test target size and a camera layout position according to an embodiment of the present invention.
Fig. 5 is a flow chart of a flow field curve drawing and friction line extraction method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-2, the three-dimensional oil flow VR online measurement and display system of the present invention includes a hardware system and a software system configured with the hardware system; the hardware system comprises a data acquisition subsystem, a data transmission subsystem, a test interaction display subsystem and a three-dimensional graphic workstation; the software system comprises a synchronization and data acquisition module, an oil flow calculation module, a real-time three-dimensional drawing calculation module, a three-dimensional modeling and rendering module and an interactive control and display module;
the data transmission subsystem is used for realizing data transmission among the data acquisition subsystem, the three-dimensional graphic workstation and the test interaction display subsystem;
the data acquisition subsystem and the synchronization and data acquisition module are used for synchronously acquiring two-dimensional images and three-dimensional point cloud data from different viewpoints for a test target and surface oil flow in the wind tunnel;
the three-dimensional graphic workstation is used for receiving the collected two-dimensional image and three-dimensional point cloud data through the data transmission subsystem; in the three-dimensional graphic workstation, the oil flow calculation module is used for calculating an oil flow field, the real-time three-dimensional drawing calculation module is used for drawing a three-dimensional image of a test target and surface oil flow in real time, and the three-dimensional modeling and rendering module is used for constructing a target three-dimensional model with enhanced oil flow field calculation result data;
the test interaction display subsystem is used for receiving the three-dimensional image and/or the target three-dimensional model generated by the three-dimensional graphic workstation through the data transmission subsystem and displaying the three-dimensional image and/or the target three-dimensional model by combining the interaction control and display module; and the human-computer interaction control system is used for the online measurement and display system of the three-dimensional oil flow VR.
The hardware system and the software system are used for realizing the online measurement and display of the three-dimensional oil flow VR, and the online measurement and display mainly comprises four parts, namely data transmission, data acquisition, graphic processing and model display.
1. Data transmission:
and the data transmission subsystem is used for realizing data transmission among the data acquisition subsystem, the three-dimensional graphic workstation and the test interaction display subsystem.
In some embodiments, the data transmission subsystem comprises a wireless router and a high-speed data transmission line, and is used for realizing wired and/or wireless connection among the data acquisition subsystem, the test interaction display subsystem and the three-dimensional graphic workstation so as to transmit data in a wired and/or wireless mode.
2. Data acquisition:
the data acquisition subsystem and the synchronization and data acquisition module are used for synchronously acquiring two-dimensional images and three-dimensional point cloud data (the three-dimensional point cloud data is obtained by converting depth images acquired by a TOF depth camera) from different viewpoints for a test target and a surface oil flow in the wind tunnel.
The data acquisition subsystem comprises a plurality of visible light cameras, TOF depth cameras and a synchronous controller; the plurality of visible light cameras and the TOF depth camera are arranged at different viewpoints, and a test target in the wind tunnel is completely covered by the visual fields of the visible light cameras and the TOF depth camera; the synchronous controller is combined with the control of the synchronization and data acquisition module to realize the synchronous control of the plurality of visible light cameras and the TOF depth camera.
As shown in fig. 3, the data acquisition subsystem is composed of 6 visible light cameras, 6 TOF depth cameras and 2 synchronization controllers, and in practical implementation, the data acquisition subsystem should have corresponding supporting mechanisms and accessories. As can be seen from the figure, the visible light camera and the TOF depth camera are arranged in pairs, each pair of the visible light camera and the TOF depth camera is arranged in close proximity, each pair of the visible light camera and the TOF depth camera is arranged at different viewpoints, and the test object in the wind tunnel is completely covered by the visual fields of the visible light camera and the TOF depth camera. If two viewpoints are arranged in the longitudinal direction of the wind tunnel, 1 pair of a visible light camera and a TOF depth camera are respectively arranged on the two viewpoints, and the view field covers the length of the whole test target; setting two viewpoints in the width direction of the wind tunnel, wherein the two viewpoints are respectively provided with 1 pair of a visible light camera and a TOF depth camera, and the viewing fields cover the height of the whole test target; two viewpoints are arranged in the longitudinal direction of the wind tunnel, 1 pair of a visible light camera and a TOF depth camera are respectively arranged on the two viewpoints, and the view field covers the height of the whole test target; and finally, connecting the 6 visible light cameras and the 6 TOF depth cameras through 2 synchronous controllers to realize synchronous control.
In the invention, the data acquisition subsystem is arranged at the outer side of the wind tunnel, so the size of a test target and the observation size of the wind tunnel need to be considered. As shown in FIG. 4, the maximum test object size is 700 mm. times.400 mm, and the wind tunnel observation size is 900 mm. times.600 mm. To ensure accuracy of oil flow field calculations, the visible light camera selects a resolution of at least 500 ten thousand pixels, the TOF depth camera selects a Bas1906 depth camera with a depth accuracy of 3 mm. According to the requirements of the size of a test object and the observation size of the wind tunnel, the key parameters of the visible light camera and the TOF depth camera can be selected as shown in the table 1.
Table 1, camera key parameters:
table 1 lists the field of view of TOF depth cameraθIs shown in FIG. 4θThe field of view of the TOF depth camera can be seenθCompletely covering the test target in the wind tunnel; object distancedIs shown in FIG. 4dAnd represents the distance of the TOF depth camera from the wind tunnel window.
In some embodiments, the software system further comprises a system calibration module; the system calibration module is used for calibrating parameters of the visible light camera and the TOF depth camera and moving the coordinate systems of the visible light camera and the TOF depth camera to the same coordinate system, so that support is provided for subsequent oil flow field calculation, real-time three-dimensional drawing three-dimensional modeling, model AR display and the like.
3. And (3) graphic processing:
the three-dimensional graphic workstation is used for receiving the collected two-dimensional image and three-dimensional point cloud data through the data transmission subsystem; in a three-dimensional graphics workstation:
the oil flow calculation module is used for calculating an oil flow field. The calculation of the oil flow field can be realized by adopting the prior art in the field, and comprises test layout and test reagent preparation, test model jitter correction, image interpretation analysis, shear force quantitative analysis, flow field curve drawing, friction force line extraction and the like.
The real-time three-dimensional drawing calculation module is used for drawing a three-dimensional image of a test target and surface oil flow in real time; because the data volume of real-time three-dimensional rendering is huge, an image-based virtual viewpoint rendering technology with relatively small calculation amount is adopted in the process, namely, according to a test target of a reference viewpoint and two-dimensional image and three-dimensional point cloud data of surface oil flow, pixels in the image of the reference viewpoint are mapped to a display image by using a 3D image mapping equation, so that a virtual viewpoint image is generated, and a three-dimensional image with a three-dimensional real-time display effect is generated.
The three-dimensional modeling and rendering module is used for constructing a target three-dimensional model with enhanced oil flow field calculation result data. Specifically, under the non-real-time condition after the test is finished, the three-dimensional modeling of the test target and the surface oil flow is realized in an off-line mode, the oil flow field calculation result is overlapped, then model rendering is carried out, and the target three-dimensional model with the oil flow field calculation result data enhanced is obtained. Namely, after the test is finished, according to the recorded two-dimensional image and three-dimensional point cloud data of the test target and the surface oil flow, the accurate three-dimensional model construction is carried out on the whole test target, the surface oil flow, the scene and the process, and the functions of off-line test three-dimensional reconstruction, display, playback and the like are realized.
4. And (3) model display:
the test interaction display subsystem and the interaction control and display module are used for receiving and displaying the three-dimensional images and/or the target three-dimensional models generated by the three-dimensional graphic workstation through the data transmission subsystem, and are used for man-machine interaction control of the three-dimensional oil flow VR online measurement and display system.
In some embodiments, for accurate display of information, good display appearance and convenient operation in the whole test process, the test interaction display subsystem includes one or more interaction display devices selected from a tablet computer, an LED display screen, a workstation display screen and a holographic projection device. Furthermore, when there are multiple interactive display devices, each interactive display device performs synchronous interaction and display, i.e., multi-terminal cooperative work is realized. The three-dimensional graphic workstation and the workstation display screen are realized by a computer with a display screen, such as a PC (personal computer), a notebook computer and the like.
Based on the above, the embodiment also discloses an operating method of the three-dimensional oil flow VR online measurement and display system, which includes:
the data transmission subsystem is adopted to realize data transmission among the data acquisition subsystem, the three-dimensional graphic workstation and the test interaction display subsystem;
synchronously acquiring two-dimensional images and three-dimensional point cloud data from different viewpoints for a test target and a surface oil flow in the wind tunnel by adopting a data acquisition subsystem and a synchronization and data acquisition module;
adopting a three-dimensional graphic workstation to receive the acquired two-dimensional image and three-dimensional point cloud data through a data transmission subsystem, and carrying out corresponding operation based on the acquired two-dimensional image and three-dimensional point cloud data: (1) calculating an oil flow field through an oil flow calculation module; (2) a real-time three-dimensional drawing calculation module is used for drawing a three-dimensional image of a test target and surface oil flow in real time by using a virtual viewpoint drawing technology; (3) through a three-dimensional modeling and rendering module, under the non-real-time condition after the test is finished, the three-dimensional modeling of a test target and surface oil flow is realized in an off-line mode, model rendering is carried out after oil flow field calculation results are overlapped, and a target three-dimensional model with enhanced oil flow field calculation result data is obtained;
and a test interactive display subsystem and an interactive control and display module are adopted to receive and display the three-dimensional images and/or the target three-dimensional models generated by the three-dimensional graphic workstation through a data transmission subsystem, and the man-machine interactive control of the three-dimensional oil flow VR online measurement and display system is realized.
The functions of the modules in the working method correspond to those of the three-dimensional oil flow VR online measuring and displaying system, and are not described herein again. In addition, the present embodiment also improves the flow field curve drawing and the friction line extraction, as shown in fig. 5, including:
s1, acquiring K sequence diagrams from the shot two-dimensional images;
s2, performing brightness equalization on the K sequence charts;
s3, performing stripe graph processing on the K sequence graphs;
s4, extracting skeleton lines from the K sequence charts processed by the S2 and the S3;
s5, averaging the skeleton lines of the K sequence charts to obtain skeleton line splines;
s6, performing curve fitting on the skeleton line spline;
s7, then carrying out discrete point sampling on the skeleton line;
s8, performing flow field vector calculation on the sequence diagram processed by the S2 by using a discrete point sampling result and adopting a cross-correlation algorithm;
and S9, drawing a flow field curve by adopting a line convolution integral to the flow field vector obtained by calculation and extracting a friction force line.
It can be seen that the method for extracting the friction line in the embodiment is mainly characterized in that: and the skeleton line constraint is added to ensure that the extracted friction force line is kept relatively consistent with the sequence diagram, so that the condition of large curve error is avoided. Considering the property that the flow field has relatively uniform flow velocity and flow direction in a certain time, an average skeleton line is obtained by adopting the multi-frame sequence diagram as final constraint, so that the final friction force line is relatively smooth.
As can be seen from the above, the three-dimensional graphic workstation of the invention divides the display of the whole test into two stages, namely a three-dimensional real-time display stage and a three-dimensional modeling display stage. In the three-dimensional real-time display stage, a virtual viewpoint drawing technology is adopted, so that the real-time performance can be met; and in the three-dimensional modeling display stage, an offline modeling mode is adopted, so that the comprehensive and accurate information can be achieved, and the three-dimensional target model is displayed to be fine and attractive.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A three-dimensional oil flow VR online measuring and displaying system is characterized by comprising a hardware system and a software system matched with the hardware system; the hardware system comprises a data acquisition subsystem, a data transmission subsystem, a test interaction display subsystem and a three-dimensional graphic workstation; the software system comprises a synchronization and data acquisition module, an oil flow calculation module, a real-time three-dimensional drawing calculation module, a three-dimensional modeling and rendering module and an interactive control and display module;
the data transmission subsystem is used for realizing data transmission among the data acquisition subsystem, the three-dimensional graphic workstation and the test interaction display subsystem;
the data acquisition subsystem and the synchronization and data acquisition module are used for synchronously acquiring two-dimensional images and three-dimensional point cloud data from different viewpoints for a test target and surface oil flow in the wind tunnel;
the three-dimensional graphic workstation is used for receiving the collected two-dimensional image and three-dimensional point cloud data through the data transmission subsystem; in the three-dimensional graphic workstation, the oil flow calculation module is used for calculating an oil flow field, the real-time three-dimensional drawing calculation module is used for drawing a three-dimensional image of a test target and surface oil flow in real time, and the three-dimensional modeling and rendering module is used for constructing a target three-dimensional model with enhanced oil flow field calculation result data;
the test interaction display subsystem and the interaction control and display module are used for receiving and displaying the three-dimensional images and/or the target three-dimensional models generated by the three-dimensional graphic workstation through the data transmission subsystem, and are used for man-machine interaction control of the three-dimensional oil flow VR online measurement and display system.
2. The three-dimensional oil flow VR on-line measurement and display system of claim 1, wherein the data acquisition subsystem includes a number of visible light cameras, TOF depth cameras, and a synchronization controller; the plurality of visible light cameras and the TOF depth camera are arranged at different viewpoints, and a test target in the wind tunnel is completely covered by the visual fields of the visible light cameras and the TOF depth camera; the synchronous controller is combined with the control of the synchronization and data acquisition module to realize the synchronous control of the plurality of visible light cameras and the TOF depth camera.
3. The three-dimensional oil flow VR on-line measuring and display system of claim 2, wherein the visible light cameras and the TOF depth cameras are arranged in pairs, each pair of visible light cameras and TOF depth cameras are arranged in close proximity, each pair of visible light cameras and TOF depth cameras are arranged at different viewpoints, and the test object in the wind tunnel is completely covered by the visual fields of the visible light cameras and the TOF depth cameras.
4. The three-dimensional oil flow VR on-line measurement and display system of claim 3, wherein the software system further includes a system calibration module; the system calibration module is used for calibrating parameters of the visible light camera and the TOF depth camera and moving the coordinate systems of the visible light camera and the TOF depth camera to the same coordinate system.
5. The three-dimensional oil flow VR on-line measurement and display system of claim 1, wherein the data transmission subsystem includes a wireless router and a high-speed data transmission line for wired and/or wireless connection between the data acquisition subsystem, the testing interactive display subsystem, and the three-dimensional graphic workstation.
6. The three-dimensional oil flow VR on-line measurement and display system of claim 1, wherein the test interactive display subsystem includes one or more interactive display devices selected from a tablet computer, an LED display large screen, a workstation display screen, and a holographic projection device.
7. The three-dimensional oil flow VR on-line measurement and display system of claim 6 wherein the three-dimensional graphics workstation and workstation display screen are implemented using a computer with a display screen.
8. An operating method of the three-dimensional oil flow VR on-line measuring and displaying system of any one of claims 1-7, comprising:
the data transmission subsystem is adopted to realize data transmission among the data acquisition subsystem, the three-dimensional graphic workstation and the test interaction display subsystem;
synchronously acquiring two-dimensional images and three-dimensional point cloud data from different viewpoints for a test target and a surface oil flow in the wind tunnel by adopting a data acquisition subsystem and a synchronization and data acquisition module;
adopting a three-dimensional graphic workstation to receive the acquired two-dimensional image and three-dimensional point cloud data through a data transmission subsystem, and carrying out corresponding operation based on the acquired two-dimensional image and three-dimensional point cloud data: (1) calculating an oil flow field through an oil flow calculation module; (2) a real-time three-dimensional drawing calculation module is used for drawing a three-dimensional image of a test target and surface oil flow in real time by using a virtual viewpoint drawing technology; (3) through a three-dimensional modeling and rendering module, under the non-real-time condition after the test is finished, the three-dimensional modeling of a test target and surface oil flow is realized in an off-line mode, model rendering is carried out after oil flow field calculation results are overlapped, and a target three-dimensional model with enhanced oil flow field calculation result data is obtained;
and a test interactive display subsystem and an interactive control and display module are adopted to receive and display the three-dimensional images and/or the target three-dimensional models generated by the three-dimensional graphic workstation through a data transmission subsystem, and the man-machine interactive control of the three-dimensional oil flow VR online measurement and display system is realized.
9. The operating method of the three-dimensional oil flow VR online measurement and display system of claim 8, wherein in the method for calculating the oil flow field through the oil flow calculation module, the flow field curve drawing and the friction force line extraction are performed through the following steps:
s1, acquiring K sequence diagrams from the shot two-dimensional images;
s2, performing brightness equalization on the K sequence charts;
s3, performing stripe graph processing on the K sequence graphs;
s4, extracting skeleton lines from the K sequence charts processed by the S2 and the S3;
s5, averaging the skeleton lines of the K sequence charts to obtain skeleton line splines;
s6, performing curve fitting on the skeleton line spline;
s7, then carrying out discrete point sampling on the skeleton line;
s8, performing flow field vector calculation on the sequence diagram processed by the S2 by using a discrete point sampling result and adopting a cross-correlation algorithm;
and S9, drawing a flow field curve by adopting a line convolution integral to the flow field vector obtained by calculation and extracting a friction force line.
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| CN113671510A (en) * | 2021-07-16 | 2021-11-19 | 中国空气动力研究与发展中心高速空气动力研究所 | Aircraft track infrared detection method and system based on oxygen absorption |
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| CN114166463B (en) * | 2022-02-14 | 2022-05-03 | 中国空气动力研究与发展中心高速空气动力研究所 | Oil flow map and surface pressure fusion simulation visualization method |
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