An intelligent control device and method for the angle of attack of a tornado test inlet

Abstract

The present invention discloses an intelligent control device and method for the attack angle of a tornado test inlet, belonging to the field of structural wind engineering test equipment. The device includes a main control computer, an attack angle control device, an inlet wind speed test module, and a PIV module inside the tornado simulator. Among them, the main control computer is wirelessly connected to the attack angle control device, the inlet wind speed test module, and the PIV module inside the tornado simulator to transmit data. The main control computer receives in real time the internal wind field structure parameters of the tornado simulator provided by the PIV module, analyzes the actual attack angle of the internal wind field based on the wind field characteristic parameter analysis algorithm, and conducts autonomous optimization analysis of the inlet attack angle through the machine learning optimization algorithm, and transmits the attack angle control amount to the attack angle control device, so as to realize the precise control of the attack angle of the tornado test inlet for the purpose of the test.

Description

Technical Field

[0001] The present invention relates to the field of structural wind engineering, and particularly to an intelligent control device and method for the attack angle of a tornado test inlet. Background Art

[0002] Currently, the research on tornadoes mainly includes several means such as on-site measurement, numerical simulation, and experimental research. Among them, due to the characteristics of tornadoes such as small scale, strong destructive power, and high prediction difficulty, the implementation of on-site measurement often requires high costs and it is difficult to obtain effective data in the core area of the wind field. In recent years, with the improvement of computer performance, using numerical simulation methods to study tornadoes has become the main trend. Based on the Computational Fluid Dynamics (CFD) method, the effect of tornadoes on structures can be simulated to guide engineering practice. However, the CFD method is still not mature enough, and the accuracy verification of the simulation results remains to be discussed. Therefore, experimental research is the most reliable and effective method for analyzing the tornado effect of engineering structures at present. At the same time, it can also verify the results of computational fluid dynamics, and invert and interpret the results of on-site measurement.

[0003] Tornado experimental research mainly uses tornado simulators to generate artificial scaled wind fields, places physical models of engineering structures in the wind fields, and conducts tests and analyses on the tornado effects of the structural models to guide engineering practice. Tornado simulators are the core and key of tornado experimental research. Currently, the representative ones in the world include the Ward tornado simulator in the United States, the ISU tornado simulator in the United States, and the WindEEE tornado simulator in Canada. Taking the commonly used Ward type as an example, the air deflection angle can be adjusted by using a grid in the inflow area of the device to realize the rotation of the air flow in the device, thereby forming an artificial tornado. However, existing numerical simulation studies have shown that the attack angle of the inflow area has a great influence on the tornado field. The existing experimental devices can only control the horizontal deflection angle of the air flow in the inflow area, ignoring the important factor of the attack angle of the inflow area in the natural tornado field. Therefore, there is an urgent need for an attack angle feedback control method and a corresponding auxiliary device to adjust the attack angle of the air flow in the inflow area of the tornado simulator, so that tornadoes can be more realistically simulated in the experiment, and the experimental results of the tornado effect of engineering structures can be more accurate. Summary of the Invention

[0004] To solve the problem that the attack angle of the inflow cannot be controlled in tornado experimental research, an intelligent control device and method for the attack angle of a tornado test inlet are adopted to achieve precise and intelligent adjustment of the attack angle of the air flow in the inflow area during a tornado test, so that the experimental results are more real and reliable.

[0005] An intelligent control device for the attack angle of a tornado test inlet includes:

[0006] A main control computer, an angle of attack control device, an inlet air velocity test module, and a PIV module inside the tornado simulator. Among them, wireless connections are used to transmit data between the main control computer and the angle of attack control device, the inlet air velocity test module, and the PIV module inside the tornado simulator.

[0007] The angle of attack control device includes: an inflow extension section, including a plurality of them, and the plurality of inflow extension sections are arranged annularly around the periphery of the inflow area of the tornado simulator. Inside each inflow extension section, there are provided:

[0008] Two guide plates, namely a first guide plate and a second guide plate. The first guide plate is arranged at the upper part of the inner cavity of the inflow extension section through a first horizontal rotating shaft, and the second guide plate is arranged at the lower part of the inner cavity of the inflow extension section through a second horizontal rotating shaft, and the second guide plate is arranged parallel to the first guide plate.

[0009] A corner driving device for driving the horizontal rotating shaft to rotate, so as to drive the two guide plates to rotate at the same rotation angle, and the two guide plates always remain parallel during the rotation process.

[0010] The inlet air velocity test module is arranged between the two guide plates.

[0011] Furthermore, it also includes two folding shed windshields, namely a first folding shed windshield and a second folding shed windshield. One end of the side wall of the inflow extension section close to the inflow area of the tornado simulator is connected to the first guide plate through the first folding shed windshield, and one end of the side wall of the inflow extension section close to the inflow area of the tornado simulator is connected to the second guide plate through the second folding shed windshield.

[0012] Furthermore, the first natural vibration frequency of the guide plate is higher than 10 Hz.

[0013] Furthermore, both ends of the two horizontal rotating shafts extend into the side wall of the inflow extension section, and the two horizontal rotating shafts are respectively connected to a set of corner driving devices through a gear transmission group; the corner driving device is fixed on its support shaft.

[0014] Furthermore, the transmission error of the gear transmission group is not higher than 0.01 degrees.

[0015] Furthermore, the corner driving device is a servo motor.

[0016] The present invention further discloses a control method for the intelligent control device of the tornado test inlet attack angle. If the required test is for a non-continuous change in the inflow attack angle, multiple modularized attack angles are preset on the main control computer. During the test, the main control computer transmits the control command to the rotation angle drive device according to the preset modularized attack angles, so that the two parallel guide plates rotate synchronously by the corresponding angles; then, the tornado simulator is turned on, and the air flow enters the inflow area of the tornado simulator through the auxiliary device. The wind speed test module and the PIV module inside the simulator monitor the flow field data in real time and transmit it to the main control computer; finally, when the main control computer determines that the flow field is stable and meets the requirements, the test can start;

[0017] If the required test is for a continuously changing inflow attack angle, the change curve of the required inflow attack angle is input on the main control computer. During the test, the main control computer transmits the corresponding attack angle control command to the rotation angle drive device according to the given change curve and the preset frequency, so that the two parallel guide plates rotate synchronously and continuously by the corresponding angles, thereby realizing the continuous control of the inflow attack angle; then, the air flow enters the inflow area of the tornado simulator through the auxiliary device, and the required inflow attack angle is continuously controlled according to the preset change curve. The PIV module inside the simulator monitors the internal wind field structure in real time and feeds it back to the main control computer. The main control computer extracts the actual attack angle of the internal flow field through the wind field characteristic parameter analysis algorithm and compares it with the target wind field attack angle for error judgment; if the attack angle error does not meet the requirements, the relationship between the current inlet attack angle and the actual attack angle inside the wind field is established through the machine learning optimization algorithm to realize the autonomous analysis of the attack angle control amount, and the attack angle control amount is transmitted to the attack angle control device;

[0018] Finally, the attack angle control device changes the inlet attack angle according to the instruction and repeats the above feedback iteration process until the error meets the requirements, thereby realizing the intelligent control of the inflow attack angle. Beneficial effects

[0019] In the present invention, data is transmitted wirelessly between the main control computer and the attack angle control device, the inlet wind speed test module, and the PIV module inside the tornado simulator. When conducting the test, the main control computer receives the internal wind field structure parameters provided by the PIV module in real time, analyzes the actual attack angle of the internal wind field based on the wind field characteristic parameter analysis algorithm, and conducts autonomous optimization analysis of the inlet attack angle through the machine learning optimization algorithm, and transmits the attack angle control amount to the attack angle control device, thereby realizing the precise control of the tornado test inlet attack angle based on multiple feedbacks, effectively making up for the defect that the existing tornado simulator cannot change the inlet attack angle.

[0020] The method of the present invention has clear logic and a simple device structure. It can be applied to various tornado simulators and can be directly installed on the periphery of the inflow area of the existing tornado simulator without the need to redesign and build a special tornado simulator, saving a large amount of manpower and financial resources. Brief Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the device of the present invention;

[0022] Figure 2 It is an installation layout diagram of the device of the present invention;

[0023] Figure 3 It is a sectional view taken along line 1-1 of the device of the present invention;

[0024] Figure 4 It is a sectional view taken along line 2-2 of the device of the present invention;

[0025] Figure 5 It is a schematic diagram of the test working condition of the positive angle of attack of the device of the present invention;

[0026] Figure 6 It is a schematic diagram of the test working condition of the negative angle of attack of the device of the present invention;

[0027] Figure 7 It is a flow chart of the method of the present invention;

[0028] In the figure: the inflow extension section 1, the guide vane 2, the horizontal rotating shaft 3, the corner driving device 4, the support shaft 5, the inlet wind speed test module 6, the main control computer 7, the tornado test simulator 8, the side wall of the inflow extension section 9, the top plate of the inflow extension section 10, the bottom plate of the inflow extension section 11, the folding shed wind baffle 12, the PIV module 13 inside the tornado simulator. Detailed Embodiments

[0029] The technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings of the specification and specific embodiments. Embodiment

[0030] As Figures 1 to 6 shown is a schematic structural diagram of the intelligent control device for the angle of attack at the inlet of the tornado test of the present invention. The device includes:

[0031] The main control computer 7, the angle of attack control device, the inlet wind speed test module 6, and the PIV module 13 inside the tornado simulator. Among them, data is transmitted between the main control computer 7 and the angle of attack control device, the inlet wind speed test module 6, and the PIV module 13 inside the tornado simulator by wireless connection;

[0032] The angle of attack control device includes: the inflow extension section 1, including a plurality of them. The plurality of inflow extension sections 1 are annularly arranged on the periphery of the inflow area of the tornado simulator. Each inflow extension section is provided with:

[0033] There are two flow deflectors 2, namely the first flow deflector and the second flow deflector. The first flow deflector is arranged at the upper part of the inner cavity of the inflow extension section through a first horizontal rotating shaft, and the second flow deflector is arranged at the lower part of the inner cavity of the inflow extension section through a second horizontal rotating shaft, and the second flow deflector is arranged in parallel with the first flow deflector;

[0034] A corner driving device 4 is used to drive the horizontal rotating shaft 3 to rotate, so as to drive the two flow deflectors 2 to rotate at the same rotation angle, and the two flow deflectors 2 always remain parallel during the rotation process;

[0035] An inlet wind speed test module 6 is arranged between the two flow deflectors 2.

[0036] As a preference for the technical solution of Embodiment 1 of the device of the present invention, the first natural vibration frequency of the flow deflector 2 is higher than 10 Hz.

[0037] As a preference for the technical solution of Embodiment 1 of the device of the present invention, both ends of the two horizontal rotating shafts extend into the side wall of the inflow extension section, and the two horizontal rotating shafts are respectively connected to a set of corner driving devices through a gear transmission group; the corner driving device is fixed on its support shaft. The transmission error of the gear transmission group is not higher than 0.01 degree.

[0038] As a preference for the technical solution of Embodiment 1 of the device of the present invention, the corner driving device is a servo motor. Embodiment

[0039] The difference between Embodiment 2 and Embodiment 1 is that in order to prevent the air flow from disturbing the test wind field without changing the angle of attack through the flow deflector, there are also two folding shed windshields, namely the first folding shed windshield and the second folding shed windshield. One end of the side wall of the inflow extension section close to the inflow area of the tornado simulator is connected to the first flow deflector through the first folding shed windshield, and one end of the side wall of the inflow extension section close to the inflow area of the tornado simulator is connected to the second flow deflector through the second folding shed windshield.

[0040] As Figure 7 As shown, the intelligent control method for the angle of attack at the inlet of the tornado test of the present invention mainly includes that the main control computer 7 is wirelessly connected to the angle of attack control device, the inlet wind speed test module 6, and the internal PIV module 13 of the tornado simulator to transmit data. When conducting the test, the main control computer 7 receives the internal wind field structure parameters provided by the PIV module 13 in real time, analyzes the actual angle of attack of the internal wind field based on the wind field characteristic parameter analysis algorithm, and conducts autonomous optimization analysis of the inlet angle of attack through the machine learning optimization algorithm, and transmits the angle of attack control amount to the angle of attack control device, so as to achieve precise control of the angle of attack at the inlet of the tornado test.

[0041] Before the test starts, the dimensions of each component of the device should be determined according to requirements to make it suitable for the tornado simulator. After checking that the shape and dimensions of each component meet the test requirements, install multiple auxiliary devices around the inflow area of the tornado simulator according to the above scheme, such as Figure 2 shown. After installation, it is necessary to carry out the 0-degree angle calibration of the corner drive device 4 and the horizontal rotating shaft 3. After calibration, make the two parallel guide plates 2 strictly parallel to the top plate 10 and the bottom plate 11 of the inflow extension section 1.

[0042] During the test, if the requirement for the accuracy control of the flow field is not high, multiple modularized angle of attack can be preset on the main control computer 7. During the test, the main control computer 7 transmits the control command to the corner drive device 4 according to the preset modularized angle of attack, so that the two parallel guide plates 2 rotate synchronously by the corresponding angle. Then, turn on the tornado simulator to make the air flow through the auxiliary device and enter the inflow area of the tornado simulator, such as Figure 5 and Figure 6 shown. The wind speed test module 6 and the internal PIV module 13 of the simulator monitor the flow field data in real time and transmit it to the main control computer 7. Finally, when the main control computer 7 determines that the flow field is stable and meets the requirements, the test can start.

[0043] During the test, if the required inflow angle of attack is continuously variable, the curve of the required inflow angle of attack change can be input on the main control computer 7. During the test, the main control computer 7 transmits the corresponding angle of attack control command to the corner drive device 4 according to the given change curve and the preset frequency, so that the two parallel guide plates 2 rotate synchronously and continuously by the corresponding angle, so as to realize the continuous control of the inflow angle of attack. Then, make the air flow through the auxiliary device and enter the inflow area of the tornado simulator, and continuously control the required inflow angle of attack according to the preset change curve. The internal PIV module 13 of the simulator monitors the internal wind field structure in real time and feeds it back to the main control computer 7. The main control computer 7 extracts the actual angle of attack of the internal flow field through the wind field characteristic parameter analysis algorithm, and compares it with the target wind field angle of attack for error judgment. If the angle of attack error does not meet the requirements, the relationship between the current inlet angle of attack and the actual angle of attack inside the wind field is established through the machine learning optimization algorithm to realize the autonomous analysis of the angle of attack control amount, and the angle of attack control amount is transmitted to the angle of attack control device. Finally, the angle of attack control device changes the inlet angle of attack according to the instruction and repeats the above feedback iteration process until the error meets the requirements, so as to realize the intelligent control of the inflow angle of attack.

[0044] The above are only the preferred examples of the present invention. According to the content disclosed in the specification, those skilled in the art can make appropriate changes and improvements to the implementation manner. The present invention is not limited to the above specific implementation manner, and the changes and improvements made should be included within the scope of the claims. Moreover, the terms used in the present invention are only for convenience of description and do not impose any limitation on the present invention.

Claims

1. An intelligent control device for the angle of attack at the entrance of a tornado test, characterized in that, it includes: a main control computer, an angle of attack control device, an inlet wind speed test module, and a PIV module inside the tornado simulator. Among them, wireless connection is used to transmit data between the main control computer and the angle of attack control device, the inlet wind speed test module, and the PIV module inside the tornado simulator; the angle of attack control device includes: an inflow extension section, including multiple ones. The multiple inflow extension sections are arranged annularly on the periphery of the inflow area of the tornado simulator. Each inflow extension section is provided with: two flow guiding plates, namely a first flow guiding plate and a second flow guiding plate. The first flow guiding plate is arranged at the upper part of the inner cavity of the inflow extension section through a first horizontal rotating shaft, and the second flow guiding plate is arranged at the lower part of the inner cavity of the inflow extension section through a second horizontal rotating shaft, and the second flow guiding plate is arranged parallel to the first flow guiding plate; a corner driving device for driving the horizontal rotating shaft to rotate, so as to drive the two flow guiding plates to rotate at the same rotation angle, and the two flow guiding plates always remain parallel during the rotation process; an inlet wind speed test module arranged between the two flow guiding plates; When conducting the test, the main control computer receives in real time the internal wind field structure parameters provided by the PIV module, analyzes the actual angle of attack of the internal wind field based on the wind field characteristic parameter analysis algorithm, and conducts autonomous optimization analysis of the inlet angle of attack through the machine learning optimization algorithm, and transmits the angle of attack control amount to the angle of attack control device, so as to realize the precise control of the inlet angle of attack of the tornado test based on multiple feedbacks.

2. The intelligent control device for the angle of attack at the entrance of a tornado test according to claim 1, characterized in that, it further includes two folding shed windshields, namely a first folding shed windshield and a second folding shed windshield. One end of the side wall of the inflow extension section close to the inflow area of the tornado simulator is connected to the first flow guiding plate through the first folding shed windshield, and one end of the side wall of the inflow extension section close to the inflow area of the tornado simulator is connected to the second flow guiding plate through the second folding shed windshield.

3. The intelligent control device for the angle of attack at the entrance of a tornado test according to claim 1, characterized in that, the first-order natural vibration frequency of the flow guiding plate is higher than 10 Hz.

4. The intelligent control device for the angle of attack at the entrance of a tornado test according to claim 1, characterized in that, both ends of the two horizontal rotating shafts extend into the side wall of the inflow extension section, and the two horizontal rotating shafts are respectively connected to a set of corner driving devices through a gear transmission group; the corner driving device is fixed on its support shaft.

5. The intelligent control device for the angle of attack at the entrance of a tornado test according to claim 4, characterized in that, the transmission error of the gear transmission group is not higher than 0.01 degrees.

6. The intelligent control device for the angle of attack at the entrance of a tornado test according to claim 1, characterized in that, the corner driving device is a servo motor.

7. The control method of the intelligent control device for the angle of attack at the entrance of a tornado test according to any one of claims 1 to 6, characterized in that, If the required incoming flow attack angle for the test is non - continuously variable, preset multiple modularized attack angles on the main control computer. During the test, the main control computer transmits the control command to the rotation angle drive device according to the preset modularized attack angles, so that the two parallel guide vanes rotate synchronously by the corresponding angles; then, turn on the tornado simulator, make the air flow through the auxiliary device into the inflow area of the tornado simulator, and the wind speed test module and the PIV module inside the simulator monitor the flow field data in real - time and transmit it to the main control computer; finally, when the main control computer determines that the flow field is stable and meets the requirements, the test can start; If the required incoming flow attack angle for the test is continuously variable, input the change curve of the incoming flow attack angle required for the test on the main control computer. During the test, the main control computer transmits the corresponding attack angle control command to the rotation angle drive device according to the given change curve and the preset frequency, so that the two parallel guide vanes rotate synchronously and continuously by the corresponding angles, thus realizing the continuous control of the incoming flow attack angle; then, make the air flow through the auxiliary device into the inflow area of the tornado simulator, and continuously control the required incoming flow attack angle according to the preset change curve. The PIV module inside the simulator monitors the internal wind field structure in real - time and feeds it back to the main control computer. The main control computer extracts the actual attack angle of the internal flow field through the wind field characteristic parameter analysis algorithm and compares it with the target wind field attack angle for error judgment; if the attack angle error does not meet the requirements, then establish the relationship between the current inlet attack angle and the actual attack angle inside the wind field through the machine learning optimization algorithm, realize the autonomous analysis of the attack angle control amount, and transmit the attack angle control amount to the attack angle control device; Finally, the attack angle control device changes the inlet attack angle according to the command and repeats the above feedback iteration process until the error meets the requirements, thus realizing the intelligent control of the incoming flow attack angle.

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