Flow calibration test device and pressure control method thereof

Abstract

The invention provides a flow calibration test device and a pressure control method thereof, and relates to the technical field of aviation. The flow calibration test device comprises N front-end test simulation pipeline cabins and N front-end test simulation pipeline cabins, the bypass unit is communicated to the front-end test simulation pipeline cabin through a first connecting pipeline; the exhaust unit is communicated to the tail end test simulation pipeline cabin through a second connecting pipeline; the N front-end test simulation pipeline cabins are communicated in sequence; the last-stage front-end test simulation pipeline cabin is communicated with the tail-end test simulation pipeline cabin; the air source module conveys air into the first front-end test simulation pipeline cabin; the control module generates a control signal for controlling the bypass unit and a tail end control signal for controlling the exhaust unit; the bypass unit adjusts the internal and external pressure difference of the test simulation pipeline cabin according to the corresponding control signal; the exhaust unit adjusts the internal and external pressure difference of the tail end test simulation pipeline cabin according to the tail end control signal. The pressure adjusting precision of the flow calibration test device is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of aviation technology, and more specifically, to a flow calibration test device and a pressure control method thereof. Background Art

[0002] There is a need for multi-level pressure control in air fluid equipment pipelines, such as gas supply pipelines, air supply systems in buildings and factories, aerodynamic testers, etc. Compared with the pressure reduction methods of gas systems and air supply systems, aerodynamic testers have higher requirements for pressure control.

[0003] At present, most of the pressure regulation methods of air pipelines are achieved by using pressure reducing valves. Among them, proportional pressure reducing valves can accurately control the pressure, but there are no proportional pressure reducing valve products that meet the large flow and high pressure requirements of current aerodynamic testers. Moreover, the pressure reducing valve belongs to the post-valve pressure regulation, which cannot meet the required working conditions of the pre-valve pressure regulation. In addition, when the aerodynamic tester has multi-stage pressure control and there is a nonlinear correlation between the multi-stage pressures, it is impossible to achieve precise control of the multi-stage pressures. Summary of the invention

[0004] In view of this, the present disclosure provides a flow calibration test device and a pressure control method thereof.

[0005] One aspect of the present disclosure provides a flow calibration test device, the flow calibration test device comprising a gas source module, a control module, a terminal test simulation module and N front-end test simulation modules; wherein N is a positive integer greater than or equal to 1;

[0006] Each of the front-end test simulation modules comprises a front-end test simulation pipeline cabin and a bypass unit; the bypass unit is connected to the front-end test simulation pipeline cabin through a first connecting pipeline;

[0007] The terminal test simulation module comprises a terminal test simulation pipeline cabin and an exhaust unit; the exhaust unit is connected to the terminal test simulation pipeline cabin through a second connecting pipeline;

[0008] The i-th front-end test simulation pipeline cabin is connected to the i+1-th front-end test simulation pipeline cabin; the N-th front-end test simulation pipeline cabin is connected to the terminal test simulation pipeline cabin; the front-end test simulation pipeline cabin and the terminal test simulation module are used to simulate the pressure environment during actual use; wherein i is a positive integer greater than or equal to 1 and less than N;

[0009] The air source module is connected to the air inlet of the first front-end test simulation pipeline cabin; the air source module is used to transport air to the first front-end test simulation pipeline cabin;

[0010] The control module is used to collect the terminal pressure value of the terminal test simulation pipeline cabin, and generate a terminal control signal for controlling the exhaust unit according to the terminal pressure value and the terminal target pressure value; collect the Nth front end pressure value of the Nth front end test simulation pipeline cabin, and when the difference between the terminal pressure value and the terminal target pressure value is less than the terminal threshold, generate the Nth control signal for controlling the Nth bypass unit according to the Nth front end pressure value and the Nth front end target pressure value; collect the i+1th front end pressure value of the i+1th front end test simulation pipeline cabin and the i-th front end pressure value of the i-th front end test simulation pipeline cabin, and when the difference between the i+1th front end pressure value and the i+1th front end target pressure value is less than the i+1th threshold, generate the i-th control signal for controlling the i-th bypass unit according to the i-th front end pressure value and the i-th target front end pressure value;

[0011] The i-th bypass unit is used to adjust the internal and external pressure difference of the i-th test simulation pipeline cabin according to the i-th control signal;

[0012] The Nth bypass unit is used to adjust the internal and external pressure difference of the Nth test simulation pipeline cabin according to the Nth control signal;

[0013] The exhaust unit is used to adjust the internal and external pressure difference of the terminal test simulation pipeline cabin according to the terminal control signal.

[0014] According to an embodiment of the present disclosure, the control module includes a controller, a terminal pressure sensor, and N front-end pressure sensors;

[0015] The terminal pressure sensor is arranged in the terminal test simulation pipeline cabin; the terminal pressure sensor is used to collect the terminal pressure value in the terminal test simulation pipeline cabin;

[0016] The Nth pressure sensor is disposed in the Nth front-end test simulation pipeline cabin; the Nth pressure sensor is used to collect the Nth front-end pressure value in the Nth front-end test simulation pipeline cabin;

[0017] The i-th pressure sensor is disposed in the i-th front-end test simulation pipeline cabin; the i-th pressure sensor is used to collect the i-th front-end pressure value in the i-th front-end test simulation pipeline cabin;

[0018] The i+1th pressure sensor is disposed in the i+1th front-end test simulation pipeline cabin; the i+1th pressure sensor is used to collect the i+1th front-end pressure value in the i+1th front-end test simulation pipeline cabin;

[0019] The above-mentioned controller is electrically connected to the above-mentioned terminal pressure sensor and the N above-mentioned front-end pressure sensors; the above-mentioned controller is used to generate a terminal control signal for controlling the above-mentioned exhaust unit according to the above-mentioned terminal pressure value and the above-mentioned terminal target pressure value; when the difference between the above-mentioned terminal pressure value and the above-mentioned terminal target pressure value is less than the terminal threshold value, the Nth control signal for controlling the Nth above-mentioned bypass unit is generated according to the above-mentioned Nth front-end pressure value and the above-mentioned Nth front-end target pressure value; when the difference between the above-mentioned i+1th front-end pressure value and the i+1th front-end target pressure value is less than the i+1th threshold value, the i-th control signal for controlling the i-th above-mentioned bypass unit is generated according to the above-mentioned i-th front-end pressure value and the i-th front-end target pressure value.

[0020] According to an embodiment of the present disclosure, the first connecting pipeline includes 1 first pipeline and N-1 second pipelines;

[0021] The first pipeline includes an air inlet, a first air outlet and a first air bypass outlet; the air inlet, the first air outlet and the first air bypass outlet are connected to each other; the first air outlet is connected to the air inlet of the first front-end test simulation pipeline cabin; the air inlet is connected to the air source module; the first air bypass outlet is connected to the first bypass unit;

[0022] The second duct includes a second air outlet and a second air bypass outlet; the second air outlet is connected to the second air bypass outlet;

[0023] The jth second air outlet is connected to the exhaust port of the jth front-end test simulation pipeline cabin; the jth second air bypass outlet is connected to the jth bypass unit; wherein j is a positive integer greater than 1 and less than or equal to N-1.

[0024] According to an embodiment of the present disclosure, it also includes N flow regulating devices;

[0025] The inlet of the Nth flow regulating device is connected to the air outlet of the Nth front-end test simulation pipeline cabin; the outlet of the Nth flow regulating device is connected to the air inlet of the terminal test simulation pipeline cabin; the Nth flow regulating device is used to regulate the flow of air delivered from the Nth front-end test simulation pipeline cabin to the terminal test simulation pipeline cabin;

[0026] The inlet of the i-th flow regulating device is connected to the air outlet of the i-th front-end test simulation pipeline cabin; the outlet of the i-th flow regulating device is connected to the air inlet of the i+1-th front-end test simulation pipeline cabin; the i-th flow regulating device is used to regulate the flow rate of air transported from the i-th front-end test simulation pipeline cabin to the i+1-th front-end test simulation pipeline cabin.

[0027] According to an embodiment of the present disclosure, the relative opening of the Nth flow regulating device is determined according to the Nth front end target pressure value of the Nth front end test simulation pipeline cabin, the terminal target pressure value of the terminal test simulation pipeline cabin, and the flow characteristic curve of the Nth flow regulating device;

[0028] The relative opening of the i-th flow regulating device is determined based on the i-th front end target pressure value of the i-th front end test simulation pipeline cabin, the i+1-th front end target pressure value of the i+1-th front end test simulation pipeline cabin and the flow characteristic curve of the i-th flow regulating device.

[0029] According to an embodiment of the present disclosure, the exhaust unit is connected to the air outlet of the terminal test simulation pipeline cabin through a second connecting pipe.

[0030] Another aspect of the present disclosure provides a pressure control method for a flow calibration test device, which is applied to the above-mentioned flow calibration test device. The pressure control method includes:

[0031] In response to the pressurization request of the terminal test simulation pipeline cabin and the N front-end test simulation pipeline cabins, obtaining the terminal target pressure value of the terminal test simulation pipeline cabin and the front-end target pressure values ​​of each of the N front-end test simulation pipeline cabins;

[0032] Obtaining the terminal pressure value of the terminal test simulation pipeline cabin and the front end pressure values ​​of each of the N front end test simulation pipeline cabins;

[0033] According to the terminal pressure value and the terminal target pressure value, the pressure regulation algorithm of the terminal test simulation pipeline cabin is applied to generate a terminal control signal for controlling the exhaust unit;

[0034] When the difference between the terminal pressure value and the terminal target pressure value is less than the terminal threshold, according to the Nth front end pressure value of the Nth front end test simulation pipeline cabin and the Nth front end target pressure value, the pressure regulation algorithm of the Nth front end test simulation pipeline cabin is applied to generate an Nth control signal for controlling the Nth bypass unit;

[0035] When the difference between the i+1th front-end pressure value of the i+1th front-end test simulation pipeline cabin and the i+1th front-end target pressure value is less than the i+1th threshold, the pressure regulation algorithm of the i-th front-end test simulation pipeline cabin is applied according to the i-th front-end pressure value of the i-th front-end test simulation pipeline cabin and the i-th front-end target pressure value, to generate the i-th control signal for controlling the i-th bypass unit.

[0036] According to an embodiment of the present disclosure, the above-mentioned terminal pressure value and the above-mentioned terminal target pressure value are used to apply the pressure regulation algorithm of the terminal test simulation pipeline cabin to generate a terminal control signal for controlling the exhaust unit, including:

[0037] When the terminal pressure value of the terminal test simulation pipeline cabin is greater than the terminal target pressure value of the terminal test simulation pipeline cabin, calculating the difference between the terminal pressure value and the terminal target pressure value;

[0038] According to the difference between the above terminal pressure value and the above terminal target pressure value, the pressure regulation algorithm of the terminal test simulation pipeline cabin is applied to generate a terminal control signal for controlling the exhaust unit.

[0039] According to an embodiment of the present disclosure, the pressure regulation algorithm of the terminal test simulation pipeline cabin is a PID control algorithm.

[0040] According to an embodiment of the present disclosure, the pressure regulation algorithm of the Nth front-end test simulation pipeline cabin is a PID control algorithm.

[0041] According to an embodiment of the present disclosure, a bypass unit is provided for each front-end test simulation pipeline cabin, and an exhaust unit is provided for the terminal test simulation pipeline cabin. When the pressure value in the terminal test simulation pipeline cabin is greater than the terminal target pressure value of the terminal test simulation pipeline cabin, the exhaust unit is adjusted so that the pressure value in the terminal test simulation pipeline cabin is stabilized at the terminal target pressure value of the terminal test simulation pipeline cabin; the corresponding bypass unit is controlled according to the pressure value of each front-end test simulation pipeline cabin and the corresponding front-end target pressure value, so that the pressure value of each front-end test simulation pipeline cabin is stabilized at the corresponding front-end target pressure value, thereby improving the pressure regulation accuracy of the flow calibration test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0043] Figure 1 The schematic diagram of the structure of the flow calibration test device in the prior art is shown;

[0044] Figure 2 The schematic diagram of the principle of the PID control algorithm is schematically shown;

[0045] Figure 3 The schematic diagram of the structure of the flow calibration test device according to the embodiment of the present disclosure is shown;

[0046] Figure 4 The schematic diagram of the structure of a flow calibration test device according to another embodiment of the present disclosure is shown;

[0047] Figure 5 A schematic diagram schematically shows the structure of a flow calibration test device according to another embodiment of the present disclosure; and

[0048] Figure 6 A flow chart schematically shows a pressure control method of a flow calibration test device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0049] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0050] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0051] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0052] When using expressions such as "at least one of A, B, and C, etc.", they should generally be interpreted according to the meaning of the expression commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0053] In the embodiments of the present disclosure, the collection, updating, analysis, processing, use, transmission, provision, disclosure, storage, etc. of the data involved (for example, including but not limited to user personal information) are in compliance with the provisions of relevant laws and regulations, are used for legitimate purposes, and do not violate public order and good morals. In particular, necessary measures are taken for user personal information to prevent illegal access to user personal information data and maintain the security of user personal information, network security, and national security.

[0054] In the embodiments of the present disclosure, the user's authorization or consent is obtained before obtaining or collecting the user's personal information.

[0055] This aerodynamic tester is a high-precision control system that works within the inlet pressure range of 5~10MPa, the flow range of 0kg / s~100kg / s, the outlet pressure control range of 0MPa~0.5MPa, the outlet flow fluctuation of 0.1%, and the flow control accuracy within 0.2%.

[0056] At present, the solution that can meet the pressure regulation requirements of aerodynamic testers is to use a regulating valve for pressure regulation. The regulating valve is a pre-valve pressure regulator to meet the working conditions of this aerodynamic tester. Using a regulating valve to regulate pressure must use a control algorithm. The more classic algorithm in the industrial control industry is PID operation control, and many controllers also integrate PID control functions. The accuracy of single-point PID control is very easy to achieve, but multi-level and multi-point PID control is a difficult point in the industry. This dynamic tester has multi-level pressure control, and there is a nonlinear correlation between the multi-level pressures, which will lead to greater difficulties in the process of precise control of multi-level pressures.

[0057] The pressure control measures for gas pipeline systems, air supply systems, and tap water supply systems are all front-to-back pressure reduction control. However, the container strength of this dynamic tester can reach the maximum allowable pipeline pressure difference, and the traditional front-to-back pressure control method cannot be used.

[0058] Figure 1 The structural diagram of the existing flow calibration test device is schematically shown.

[0059] like Figure 1 As shown in the figure, the flow calibration test bench is used for aerodynamic tests of aviation devices. The flow calibration test bench consists of a continuous pipeline, which is separated by regulating valves. Air with a certain flow rate and pressure is blown into the upstream of the pipeline, and the test piece is placed in different pipeline compartments downstream. Taking two-stage pressure control as an example, the pressure P in pipeline A needs to be accurately controlled during the test debugging process. A and the pressure P in pipe B B , to meet the testing needs of aviation devices.

[0060] Existing debugging P A Pressure and P B The method is to design two sets of unipolar PID programs to adjust the opening of valve 2 and valve 3 respectively, and then control P A Pressure and P B pressure. But the difficulty of current debugging is P A and P B The upstream and downstream of the same pipeline have a correlation in size changes, and the P A It will also affect P B The value of P BIt will also affect P A Due to the pressure fluctuation of the inflowing air, the compressibility of the air and the volume effect of the equipment, it is difficult to accurately describe P with a mathematical relationship. A and P B The changing relationship between the pressure values ​​will cause P A and P B The value of oscillates back and forth at the target point, and the pressure of both cannot be accurately controlled.

[0061] Figure 2 The schematic diagram of the principle of the PID control algorithm is shown schematically.

[0062] like Figure 2 As shown, the classic PID regulation model is a single target value, a single feedback value, and a single control object. Although the above two-stage pressure control also satisfies the single target value P A and P B , single feedback value P A and P B , single control object valve 2 and valve 3, but because pipeline A and pipeline B will change the controlled characteristics of valve 2 during the pressure regulation process, that is, the change in the pressure ratio before and after the valve affects the control model of the valve, which will cause P A The PID control is unstable, that is, the control model of the controlled object changes, causing the control result to oscillate.

[0063] The present invention combines valve characteristics and PID control algorithm, cooperates with the gas source pressure boosting process, and adopts a pressure adjustment strategy from back to front to achieve P A and P B Precise control.

[0064] An embodiment of the present disclosure provides a flow calibration test device, which includes a gas source module, a control module, a terminal test simulation module and N front-end test simulation modules; wherein N is a positive integer greater than or equal to 1.

[0065] Each front-end test simulation module includes a front-end test simulation pipeline cabin 1 and a bypass unit 6; the bypass unit 6 is connected to the front-end test simulation pipeline cabin 1 through a first connecting pipeline 3. The terminal test simulation module includes a terminal test simulation pipeline cabin 4 and an exhaust unit 5; the exhaust unit 5 is connected to the terminal test simulation pipeline cabin 4 through a second connecting pipeline.

[0066] The i-th front-end test simulation pipeline cabin is connected to the i+1-th front-end test simulation pipeline cabin; the N-th front-end test simulation pipeline cabin is connected to the terminal test simulation pipeline cabin 4; the front-end test simulation pipeline cabin 1 and the terminal test simulation module are used to simulate the pressure environment during actual use; wherein, i is a positive integer greater than or equal to 1 and less than N.

[0067] The air source module is connected to the air inlet of the first front-end test simulation pipeline cabin; the air source module is used to transport air to the first front-end test simulation pipeline cabin.

[0068] The control module is used to collect the terminal pressure value of the terminal test simulation pipeline cabin 4, and generate a terminal control signal for controlling the exhaust unit 5 according to the terminal pressure value and the terminal target pressure value; collect the Nth front end pressure value of the Nth front end test simulation pipeline cabin, and when the difference between the terminal pressure value and the terminal target pressure value is less than the terminal threshold, generate the Nth control signal for controlling the Nth bypass unit according to the Nth front end pressure value and the Nth front end target pressure value; collect the i+1th front end pressure value of the i+1th front end test simulation pipeline cabin and the i-th front end pressure value of the i-th front end test simulation pipeline cabin, and when the difference between the i+1th front end pressure value and the i+1th front end target pressure value is less than the i+1th threshold, generate the i-th control signal for controlling the i-th bypass unit according to the i-th front end pressure value and the i-th target front end pressure value.

[0069] The i-th bypass unit is used to adjust the internal and external pressure difference of the i-th test simulation pipeline cabin according to the i-th control signal. The N-th bypass unit is used to adjust the internal and external pressure difference of the N-th test simulation pipeline cabin according to the N-th control signal. The exhaust unit 5 is used to adjust the internal and external pressure difference of the terminal test simulation pipeline cabin 4 according to the terminal control signal.

[0070] Figure 3 The structural diagram of the flow calibration test device according to an embodiment of the present disclosure is schematically shown.

[0071] like Figure 3 As shown, taking the three-stage test simulation pipeline cabin as an example, it includes 2 front-end test simulation modules and 1 terminal test simulation module. Among them, each front-end test simulation module includes a front-end test simulation pipeline cabin 1 and a bypass unit 6, and the terminal test simulation module includes a terminal test simulation pipeline cabin 4 and an exhaust unit 5. The two front-end test simulation pipeline cabins 1 are connected through a valve, and the second front-end test simulation pipeline cabin is connected to the terminal test simulation pipeline cabin 4 through a valve. The bypass unit 6 of each front-end test simulation pipeline cabin 1 can select a valve and be connected to the front-end test simulation pipeline cabin 1 through the first pipeline. The exhaust unit 5 can be selected as a valve and can be directly connected to the terminal test simulation pipeline cabin 4. The exhaust unit 5 is connected to the air outlet of the terminal test simulation pipeline cabin 4 through a second connecting pipeline.

[0072] According to an embodiment of the present disclosure, an exhaust bypass unit 6 is added, and the front-end test simulation pipeline cabin is connected to the atmosphere through the first connecting pipe 3, in order to simplify the mathematical model of the controlled object during PID operation and reduce errors and oscillations during PID operation.

[0073] According to an embodiment of the present disclosure, by controlling valve 2 and valve 3, P A and P B The method is changed to change the pressure of the front-end test simulation pipeline cabin by controlling the bypass unit 6, and change the pressure of the terminal test simulation pipeline cabin 4 by controlling the exhaust unit 5.

[0074] According to an embodiment of the present disclosure, a bypass unit 6 is provided for each front-end test simulation pipeline cabin, and an exhaust unit 5 is provided for the terminal test simulation pipeline cabin 4. When the pressure value in the terminal test simulation pipeline cabin 4 is greater than the terminal target pressure value of the terminal test simulation pipeline cabin 4, the exhaust unit 5 is adjusted so that the pressure value in the terminal test simulation pipeline cabin 4 is stabilized at the terminal target pressure value of the terminal test simulation pipeline cabin 4; the corresponding bypass unit 6 is controlled according to the pressure value of each front-end test simulation pipeline cabin and the corresponding front-end target pressure value, so that the pressure value of each front-end test simulation pipeline cabin is stabilized at the corresponding front-end target pressure value, thereby improving the pressure regulation accuracy of the flow calibration test device.

[0075] According to an embodiment of the present disclosure, the control module includes a controller, a terminal pressure sensor and N front-end pressure sensors; the terminal pressure sensor is arranged in the terminal test simulation pipeline cabin 4; the terminal pressure sensor is used to collect the terminal pressure value in the terminal test simulation pipeline cabin 4.

[0076] The Nth pressure sensor is arranged in the Nth front-end test simulation pipeline cabin; the Nth pressure sensor is used to collect the Nth front-end pressure value in the Nth front-end test simulation pipeline cabin; the i-th pressure sensor is arranged in the i-th front-end test simulation pipeline cabin; the i-th pressure sensor is used to collect the i-th front-end pressure value in the i-th front-end test simulation pipeline cabin; the i+1th pressure sensor is arranged in the i+1th front-end test simulation pipeline cabin; the i+1th pressure sensor is used to collect the i+1th front-end pressure value in the i+1th front-end test simulation pipeline cabin.

[0077] The controller is electrically connected to the terminal pressure sensor and N front-end pressure sensors; the controller is used to generate a terminal control signal for controlling the exhaust unit 5 according to the terminal pressure value and the terminal target pressure value; when the difference between the terminal pressure value and the terminal target pressure value is less than the terminal threshold value, the Nth control signal for controlling the Nth bypass unit is generated according to the Nth front-end pressure value and the Nth front-end target pressure value; when the difference between the i+1th front-end pressure value and the i+1th front-end target pressure value is less than the i+1th threshold value, the i-th control signal for controlling the i-th bypass unit is generated according to the i-th front-end pressure value and the i-th front-end target pressure value.

[0078] According to an embodiment of the present disclosure, the control module includes a plurality of front-end pressure sensors, each of which is arranged in a corresponding front-end test simulation pipeline cabin. Each front-end pressure sensor may include a plurality of pressure sensors, that is, a plurality of pressure sensors are arranged in the front-end test simulation pipeline cabin, distributed in different positions in the front-end test simulation pipeline cabin, and the controller collects a plurality of pressure values ​​in the front-end test simulation pipeline cabin, and averages the plurality of pressure values ​​as the actual pressure value in the front-end test simulation pipeline cabin.

[0079] According to an embodiment of the present disclosure, the flow calibration test device also includes N flow regulating devices 2; the inlet of the Nth flow regulating device is connected to the air outlet of the Nth front-end test simulation pipeline cabin; the outlet of the Nth flow regulating device is connected to the air inlet of the terminal test simulation pipeline cabin 4; the Nth flow regulating device is used to adjust the flow rate of air delivered from the Nth front-end test simulation pipeline cabin to the terminal test simulation pipeline cabin 4; the inlet of the i-th flow regulating device is connected to the air outlet of the i-th front-end test simulation pipeline cabin; the outlet of the i-th flow regulating device is connected to the air inlet of the i+1-th front-end test simulation pipeline cabin; the i-th flow regulating device is used to adjust the flow rate of air delivered from the i-th front-end test simulation pipeline cabin to the i+1-th front-end test simulation pipeline cabin.

[0080] According to an embodiment of the present disclosure, the N flow regulating devices 2 may all be regulating valves. Figure 3 As shown, the air outlet of the first front-end test simulation pipeline cabin is connected to the air inlet of the second front-end test simulation pipeline cabin through a regulating valve; the air outlet of the second front-end test simulation pipeline cabin is connected to the air inlet of the terminal test simulation pipeline cabin 4 through a regulating valve.

[0081] According to an embodiment of the present disclosure, the relative opening of the Nth flow regulating device is determined based on the Nth front end target pressure value of the Nth front end test simulation pipeline cabin, the terminal target pressure value of the terminal test simulation pipeline cabin 4, and the flow characteristic curve of the Nth flow regulating device; the relative opening of the i-th flow regulating device is determined based on the i-th front end target pressure value of the i-th front end test simulation pipeline cabin, the i+1-th front end target pressure value of the i+1-th front end test simulation pipeline cabin, and the flow characteristic curve of the i-th flow regulating device.

[0082] According to the embodiments of the present disclosure, Figure 3 As shown, the relative opening of the regulating valve between the first front-end test simulation pipeline cabin and the second front-end test simulation pipeline cabin is preset to a fixed value according to the pressure ratio of the front-end target pressure value of the first front-end test simulation pipeline cabin to the front-end target pressure value of the second front-end test simulation pipeline cabin and the outflow characteristics of the regulating valve.

[0083] According to an embodiment of the present disclosure, the first connecting duct 3 includes 1 first duct and N-1 second ducts; the first duct includes an air inlet, a first air outlet and a first air bypass outlet; the air inlet, the first air outlet and the first air bypass outlet are connected to each other; the first air outlet is connected to the air inlet of the first front-end test simulation duct cabin; the air inlet is connected to the air source module; the first air bypass outlet is connected to the first bypass unit.

[0084] The second pipeline includes 1 second air outlet and 1 second air bypass outlet; the second air outlet is connected to the second air bypass outlet; the jth second air outlet is connected to the exhaust port of the jth front-end test simulation pipeline cabin; the jth second air bypass outlet is connected to the jth bypass unit; wherein j is a positive integer greater than 1 and less than or equal to N-1.

[0085] Figure 4 The structural diagram of a flow calibration test device according to another embodiment of the present disclosure is schematically shown.

[0086] like Figure 4 As shown, taking the two-stage test simulation pipeline cabin as an example, the bypass unit 6 connected to the front test simulation pipeline cabin is connected to the front test simulation pipeline cabin pipeline through the second pipeline. The exhaust unit 5 is connected to the exhaust port of the terminal test simulation pipeline cabin 4.

[0087] Figure 5 The structural diagram of a flow calibration test device according to another embodiment of the present disclosure is schematically shown.

[0088] like Figure 5 As shown, taking the two-stage test simulation pipeline cabin as an example, the bypass unit 6 connected to the front-end test simulation pipeline cabin is connected to the front-end test simulation pipeline cabin pipeline through the first pipeline. Figure 4 and Figure 5 It can be seen that the two bypass units corresponding to the two front-end test simulation pipeline cabins can all be connected to the corresponding front-end test simulation pipeline cabins through the second pipeline, or the bypass unit of the first front-end test simulation pipeline cabin can be connected to the first front-end test simulation pipeline cabin through the first pipeline, and the bypass units of the other N-1 front-end test simulation pipeline cabins can be connected to the corresponding front-end test simulation pipeline cabins through the first pipeline.

[0089] Figure 6 A flow chart schematically shows a pressure control method of a flow calibration test device according to an embodiment of the present disclosure.

[0090] like Figure 6 As shown, the pressure control method includes operations 601 to 605.

[0091] In operation 601 : in response to pressurization requests of the terminal test simulation pipeline cabin and N front-end test simulation pipeline cabins, a terminal target pressure value of the terminal test simulation pipeline cabin and a front-end target pressure value of each of the N front-end test simulation pipeline cabins are obtained;

[0092] In operation 602 : obtaining the terminal pressure value of the terminal test simulation pipeline cabin and the front end pressure values ​​of each of the N front end test simulation pipeline cabins;

[0093] In operation 603: according to the terminal pressure value and the terminal target pressure value, a pressure regulation algorithm of the terminal test simulation pipeline cabin is applied to generate a terminal control signal for controlling the exhaust unit;

[0094] At operation 604: when the difference between the terminal pressure value and the terminal target pressure value is less than the terminal threshold, applying the pressure regulation algorithm of the Nth front end test simulation pipeline cabin according to the Nth front end pressure value of the Nth front end test simulation pipeline cabin and the Nth front end target pressure value, generating an Nth control signal for controlling the Nth bypass unit;

[0095] In operation 605: when the difference between the i+1th front-end pressure value of the i+1th front-end test simulation pipeline cabin and the i+1th front-end target pressure value is less than the i+1th threshold value, the pressure regulation algorithm of the i-th front-end test simulation pipeline cabin is applied according to the i-th front-end pressure value of the i-th front-end test simulation pipeline cabin and the i-th front-end target pressure value, to generate the i-th control signal for controlling the i-th bypass unit.

[0096] According to an embodiment of the present disclosure, the controller realizes that the front end pressure value in the front end test simulation pipeline cabin is stabilized at the front end target pressure value according to the front end pressure value and the front end target pressure value in the corresponding front end test simulation pipeline cabin collected by each front end pressure sensor. The controller first generates the terminal control signal of the layer exhaust unit 5 according to the terminal pressure value and the terminal target pressure value in the terminal test simulation pipeline cabin 4, and the terminal control signal can control the opening of the exhaust unit 5 so that the terminal pressure value in the terminal test simulation pipeline cabin 4 is stabilized at the terminal target pressure value. Then, from back to front, according to the front end pressure value and the front end target pressure value in the front end test simulation pipeline cabin of each level, the control signal of the bypass unit in the Nth, N-1th, ..., i-th, ..., and 1st front end test simulation pipeline cabin is generated in sequence. The control signal realizes that the front end pressure value in the front end test simulation pipeline cabin of each level is stabilized at the front end target pressure value by controlling the opening of the bypass unit, that is, the front end pressure value in the Nth, N-1th, ..., i-th, ..., and 1st front end test simulation pipeline cabin is stabilized at the front end target pressure value in sequence.

[0097] According to an embodiment of the present disclosure, based on the terminal pressure value and the terminal target pressure value, a pressure regulating algorithm of the terminal test simulation pipeline cabin 4 is applied to generate a terminal control signal for controlling the exhaust unit 5, including: when the terminal pressure value of the terminal test simulation pipeline cabin 4 is greater than the terminal target pressure value of the terminal test simulation pipeline cabin 4, the difference between the terminal pressure value and the terminal target pressure value is calculated; based on the difference between the terminal pressure value and the terminal target pressure value, a pressure regulating algorithm of the terminal test simulation pipeline cabin 4 is applied to generate a terminal control signal for controlling the exhaust unit 5.

[0098] According to an embodiment of the present disclosure, the pressure regulation algorithm of the terminal test simulation pipeline cabin 4 is a PID control algorithm. The pressure regulation algorithm of the Nth front-end test simulation pipeline cabin is a PID control algorithm. The pressure regulation algorithm of the i-th front-end test simulation pipeline cabin is a PID control algorithm.

[0099] According to an embodiment of the present disclosure, taking a two-stage test simulation pipeline cabin as an example, a pressure control algorithm is applied to control the pressure of the two-stage test simulation pipeline cabin, including:

[0100] like Figure 4 or Figure 5 As shown, preset opening values ​​of the flow regulating device 2, the bypass unit 6 and the exhaust unit 5 are set. The opening of the bypass unit 6 and the exhaust unit 5 can be set to a completely closed state, or to a smaller opening value, so that the pressure values ​​of the front-end test simulation pipeline cabin and the terminal test simulation pipeline cabin 4 can continue to increase. The air source module starts to start the machine pressurization and outputs a high-pressure air flow; the pressure of the air flow output by the air source module is greater than the front-end target pressure value of the front-end test simulation pipeline cabin, and the front-end target pressure value of the front-end test simulation pipeline cabin is greater than the terminal target pressure value of the terminal test simulation pipeline cabin 4.

[0101] Subsequently, the air source module continuously inputs air into the front-end test simulation pipeline cabin, and the pressure values ​​of the front-end test simulation pipeline cabin and the terminal test simulation pipeline cabin 4 begin to increase. When the terminal pressure value of the terminal test simulation pipeline cabin 4 reaches the terminal target pressure value of the terminal test simulation pipeline cabin 4, the exhaust unit 5 begins to accept automatic adjustment of the PID control algorithm to keep the terminal pressure value of the terminal test simulation pipeline cabin 4 stable at the terminal target pressure value.

[0102] When the terminal pressure value of the terminal test simulation pipeline cabin 4 stabilizes at the terminal target pressure value, the air source module continues to input air to the front-end test simulation pipeline cabin, and the front-end pressure value of the front-end test simulation pipeline cabin continues to increase. When the front-end pressure value of the front-end test simulation pipeline cabin increases to the front-end target pressure value, the bypass unit 6 begins to accept the automatic adjustment of the PID control algorithm, so that the front-end pressure value of the front-end test simulation pipeline cabin is stabilized at the front-end target pressure value. At this point, the multi-stage pressure adjustment and control from back to front is completed.

[0103] According to the embodiment of the present disclosure, the air source module continuously inputs air into the front-end test simulation pipeline cabin, and the air enters the terminal test simulation pipeline cabin 4 through the flow regulating device between the front-end test simulation pipeline cabin and the terminal test simulation pipeline cabin 4, and the terminal pressure value of the terminal test simulation pipeline cabin 4 continues to increase. When the air source module starts to start the machine pressurization, the PID control algorithm of the bypass unit 6 of the front-end test simulation pipeline cabin and the PID control algorithm of the exhaust unit 5 of the terminal test simulation pipeline cabin 4 can be turned on. First, the opening of the exhaust unit 5 is controlled according to the PID control algorithm of the exhaust unit 5 of the terminal test simulation pipeline cabin 4. When the terminal pressure value of the terminal test simulation pipeline cabin 4 is stabilized at the terminal target pressure value of the terminal test simulation pipeline cabin 4, the current opening of the exhaust unit 5 is kept unchanged; the opening of the bypass unit 6 is controlled according to the PID control algorithm of the bypass unit 6 of the front-end test simulation pipeline cabin. When the front-end pressure value of the front-end test simulation pipeline cabin is stabilized at the front-end target pressure value, the opening of the bypass unit 6 is kept unchanged. At this point, the multi-stage pressure regulation and control from back to front is completed.

[0104] The flowcharts and block diagrams in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram may represent a module, a program segment, or a part of a code, and the above-mentioned module, program segment, or a part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box may also occur in an order different from that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of boxes in the block diagram or flowchart, can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions. It can be understood by those skilled in the art that the features recorded in the various embodiments of the present disclosure can be combined and / or combined in a variety of ways, even if such a combination or combination is not explicitly recorded in the present disclosure. In particular, without departing from the spirit and teaching of the present disclosure, the features described in the various embodiments of the present disclosure may be combined and / or combined in a variety of ways. All of these combinations and / or combinations fall within the scope of the present disclosure.

[0105] The embodiments of the present disclosure are described above. However, these embodiments are only for illustrative purposes and are not intended to limit the scope of the present disclosure. Although the embodiments are described above, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. Without departing from the scope of the present disclosure, those skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A flow calibration test device, characterized in that: The flow calibration test device includes a gas source module, a control module, a terminal test simulation module and N front-end test simulation modules; wherein N is a positive integer greater than or equal to 1; Each of the front-end test simulation modules includes a front-end test simulation pipeline cabin and a bypass unit; the bypass unit is connected to the front-end test simulation pipeline cabin through a first connecting pipeline; The terminal test simulation module includes a terminal test simulation pipeline cabin and an exhaust unit; the exhaust unit is connected to the terminal test simulation pipeline cabin through a second connecting pipeline; The i-th front-end test simulation pipeline cabin is connected to the i+1-th front-end test simulation pipeline cabin; the N-th front-end test simulation pipeline cabin is connected to the terminal test simulation pipeline cabin; the front-end test simulation pipeline cabin and the terminal test simulation module are used to simulate the pressure environment during actual use; wherein i is a positive integer greater than or equal to 1 and less than N; The air source module is connected to the air inlet of the first front-end test simulation pipeline cabin; the air source module is used to transport air into the first front-end test simulation pipeline cabin; The control module is used to collect the terminal pressure value of the terminal test simulation pipeline cabin, and generate a terminal control signal for controlling the exhaust unit according to the terminal pressure value and the terminal target pressure value; collect the Nth front end pressure value of the Nth front end test simulation pipeline cabin, and when the difference between the terminal pressure value and the terminal target pressure value is less than the terminal threshold, generate the Nth control signal for controlling the Nth bypass unit according to the Nth front end pressure value and the Nth front end target pressure value; collect the i+1th front end pressure value of the i+1th front end test simulation pipeline cabin and the i-th front end pressure value of the i-th front end test simulation pipeline cabin, and when the difference between the i+1th front end pressure value and the i+1th front end target pressure value is less than the i+1th threshold, generate the i-th control signal for controlling the i-th bypass unit according to the i-th front end pressure value and the i-th target front end pressure value; The i-th bypass unit is used to adjust the internal and external pressure difference of the i-th test simulation pipeline cabin according to the i-th control signal; The Nth bypass unit is used to adjust the internal and external pressure difference of the Nth test simulation pipeline cabin according to the Nth control signal; The exhaust unit is used to adjust the internal and external pressure difference of the terminal test simulation pipeline cabin according to the terminal control signal.

2. The flow calibration test device according to claim 1, characterized in that: The control module includes a controller, a terminal pressure sensor and N front-end pressure sensors; The terminal pressure sensor is arranged in the terminal test simulation pipeline cabin; the terminal pressure sensor is used to collect the terminal pressure value in the terminal test simulation pipeline cabin; The Nth pressure sensor is disposed in the Nth front-end test simulation pipeline cabin; the Nth pressure sensor is used to collect the Nth front-end pressure value in the Nth front-end test simulation pipeline cabin; The i-th pressure sensor is arranged in the i-th front-end test simulation pipeline cabin; The i-th pressure sensor is used to collect the i-th front end pressure value in the i-th front end test simulation pipeline cabin; The i+1th pressure sensor is disposed in the i+1th front-end test simulation pipeline cabin; the i+1th pressure sensor is used to collect the i+1th front-end pressure value in the i+1th front-end test simulation pipeline cabin; The controller is electrically connected to the terminal pressure sensor and the N front-end pressure sensors; the controller is used to generate a terminal control signal for controlling the exhaust unit according to the terminal pressure value and the terminal target pressure value; when the difference between the terminal pressure value and the terminal target pressure value is less than the terminal threshold value, the controller generates an Nth control signal for controlling the Nth bypass unit according to the Nth front-end pressure value and the Nth front-end target pressure value; When the difference between the i+1th front end pressure value and the i+1th front end target pressure value is less than the i+1th threshold, an i-th control signal for controlling the i-th bypass unit is generated according to the i-th front end pressure value and the i-th front end target pressure value.

3. The flow calibration test device according to claim 1, characterized in that: The first connecting pipeline includes 1 first pipeline and N-1 second pipelines; The first duct comprises an air inlet, a first air outlet and a first air bypass outlet; the air inlet, the first air outlet and the first air bypass outlet are connected to each other; The first air outlet is connected to the air inlet of the first front-end test simulation pipeline cabin; the air inlet is connected to the air source module; the first air bypass outlet is connected to the first bypass unit; The second duct includes a second air outlet and a second air bypass outlet; the second air outlet is connected to the second air bypass outlet; The jth second air outlet is connected to the exhaust port of the jth front-end test simulation pipeline cabin; the jth second air bypass outlet is connected to the jth bypass unit; wherein j is a positive integer greater than 1 and less than or equal to N-1.

4. The flow calibration test device according to claim 1, characterized in that: Also includes N flow regulating devices; The inlet of the Nth flow regulating device is connected to the air outlet of the Nth front-end test simulation pipeline cabin; the outlet of the Nth flow regulating device is connected to the air inlet of the terminal test simulation pipeline cabin; the Nth flow regulating device is used to regulate the flow of air delivered from the Nth front-end test simulation pipeline cabin to the terminal test simulation pipeline cabin; The inlet of the i-th flow regulating device is connected to the air outlet of the i-th front-end test simulation pipeline cabin; The outlet of the i-th flow regulating device is connected to the air inlet of the i+1-th front-end test simulation pipeline cabin; the i-th flow regulating device is used to regulate the flow of air transported from the i-th front-end test simulation pipeline cabin to the i+1-th front-end test simulation pipeline cabin.

5. The flow calibration test device according to claim 4, characterized in that: Determine the relative opening of the Nth flow regulating device according to the Nth front end target pressure value of the Nth front end test simulation pipeline cabin, the terminal target pressure value of the terminal test simulation pipeline cabin, and the flow characteristic curve of the Nth flow regulating device; The relative opening of the i-th flow regulating device is determined based on the i-th front end target pressure value of the i-th front end test simulation pipeline cabin, the i+1-th front end target pressure value of the i+1-th front end test simulation pipeline cabin, and the flow characteristic curve of the i-th flow regulating device.

6. The flow calibration test device according to claim 1, characterized in that: The exhaust unit is connected to the air outlet of the terminal test simulation pipeline cabin through a second connecting pipeline.

7. A pressure control method for a flow calibration test device, characterized in that: Applied to the flow calibration test device according to any one of claims 1 to 6, the pressure control method comprises: In response to pressurization requests of the terminal test simulation pipeline cabin and N front-end test simulation pipeline cabins, obtaining a terminal target pressure value of the terminal test simulation pipeline cabin and a front-end target pressure value of each of the N front-end test simulation pipeline cabins; Obtaining the terminal pressure value of the terminal test simulation pipeline cabin and the front end pressure values ​​of each of the N front end test simulation pipeline cabins; According to the terminal pressure value and the terminal target pressure value, a pressure regulation algorithm of the terminal test simulation pipeline cabin is applied to generate a terminal control signal for controlling the exhaust unit; When the difference between the terminal pressure value and the terminal target pressure value is less than the terminal threshold, according to the Nth front end pressure value and the Nth front end target pressure value of the Nth front end test simulation pipeline cabin, the pressure regulation algorithm of the Nth front end test simulation pipeline cabin is applied to generate an Nth control signal for controlling the Nth bypass unit; When the difference between the i+1th front-end pressure value of the i+1th front-end test simulation pipeline cabin and the i+1th front-end target pressure value is less than the i+1th threshold, the pressure regulation algorithm of the i-th front-end test simulation pipeline cabin is applied according to the i-th front-end pressure value of the i-th front-end test simulation pipeline cabin and the i-th front-end target pressure value, to generate the i-th control signal for controlling the i-th bypass unit.

8. The pressure control method of the flow calibration test device according to claim 7, characterized in that: The method of applying the pressure regulation algorithm of the terminal test simulation pipeline cabin according to the terminal pressure value and the terminal target pressure value to generate a terminal control signal for controlling the exhaust unit includes: When the terminal pressure value of the terminal test simulation pipeline cabin is greater than the terminal target pressure value of the terminal test simulation pipeline cabin, calculating the difference between the terminal pressure value and the terminal target pressure value; According to the difference between the terminal pressure value and the terminal target pressure value, the pressure regulation algorithm of the terminal test simulation pipeline cabin is applied to generate a terminal control signal for controlling the exhaust unit.

9. The pressure control method of the flow calibration test device according to claim 7, characterized in that: The pressure regulation algorithm of the terminal test simulation pipeline cabin is a PID control algorithm.

10. The pressure control method of the flow calibration test device according to claim 7, characterized in that: The pressure regulation algorithm of the Nth front-end test simulation pipeline cabin is a PID control algorithm.

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