A method for automatic range selection and fault tolerance of total pressure sensor in high-speed wind tunnel

Abstract

The present invention belongs to the technical field of wind tunnel test control, and discloses a method for automatic range selection and fault tolerance of a total pressure sensor of a high-speed wind tunnel. The method issues test conditions through a wind tunnel operation management computer, and the wind tunnel core controller automatically selects a total pressure sensor of a suitable range according to the size of the target total pressure value, closes the electromagnetic on-off valve of the total pressure sensor gas circuit that is smaller than the suitable range, and opens the electromagnetic on-off valve of the total pressure sensor gas circuit of the suitable range and above. After the test starts, the wind tunnel core controller collects the readings of all the total pressure sensors of the opened range. If the difference between the measured value of the total pressure sensor of the maximum range and the measured value of the total pressure sensor of the selected range is greater than the set threshold, the wind tunnel core control software automatically uses the measured value of the total pressure sensor of a higher range as the total pressure control feedback value. The method realizes the automatic selection of the total pressure sensor range, reduces the workload of manual operation, avoids operational errors, and ensures the safe conduct of the wind tunnel test.

Description

Technical Field

[0001] The invention belongs to the technical field of wind tunnel test control, and in particular relates to an automatic range selection and fault tolerance method for a total pressure sensor in a high-speed wind tunnel. Background Art

[0002] Wind tunnel total pressure measurement is an important and indispensable part of wind tunnel operation. When testing total pressure at different Mach numbers or at the same Mach number, the total pressure varies greatly. To improve the measurement accuracy of total pressure, wind tunnels are usually equipped with multiple total pressure sensors of different ranges. The total pressure sensor of appropriate range is selected as the total pressure control feedback sensor according to the different operating total pressures.

[0003] The traditional method is to set a manual shut-off valve in front of the total pressure sensor of each range, and connect or close the total pressure gas line by opening and closing the manual shut-off valve. Before the test, the test personnel select the total pressure sensor of the appropriate range according to the target total pressure value of the test, close the gas line of the total pressure sensor smaller than the appropriate range, keep the gas line of the total pressure sensor of the appropriate range and above open, and then specify which range of total pressure sensor measurement value to use as the total pressure feedback value on the wind tunnel operation management computer. If the test personnel make an error in operating the manual shut-off valve or specify the wrong range of the total pressure sensor as the control total pressure feedback on the operation management computer, the result of total pressure overpressure may occur during the test, seriously threatening the safe operation of the wind tunnel.

[0004] Currently, there is an urgent need to develop an automatic range selection and fault tolerance method for total pressure sensors in high-speed wind tunnels. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for automatic range selection and fault tolerance of a total pressure sensor of a high-speed wind tunnel.

[0006] The automatic range selection and fault tolerance method of the high-speed wind tunnel total pressure sensor of the present invention comprises the following steps:

[0007] S10. Connect the measuring ends of several total pressure sensors with different measuring ranges to the total pressure gas path of the wind tunnel through the corresponding electromagnetic on-off valves, and connect the output ends to the data acquisition unit of the wind tunnel core controller; connect the control end of the electromagnetic on-off valve to the digital output unit of the wind tunnel core controller, and connect the wind tunnel operation management computer to the wind tunnel core controller via Ethernet;

[0008] S20. Before the test, the wind tunnel operation management computer sends the test conditions, including the target total pressure value, to the wind tunnel core controller via Ethernet;

[0009] S30. The wind tunnel core control software performs the first calculation and judgment according to the target total pressure value, and determines the total pressure sensor with a range greater than the target total pressure value as the total pressure control feedback sensor; the wind tunnel core controller outputs a control signal to open the total pressure sensor with the selected range and the electromagnetic on-off valve connected to the total pressure sensor with a larger range than the selected range, and close the electromagnetic on-off valve connected to the total pressure sensor with a smaller range than the selected range;

[0010] S40. During the test, the wind tunnel core controller collects signals from all turned-on total pressure sensors, and performs a second calculation and judgment. If the difference between the total pressure sensor value of the maximum range and the total pressure sensor value of the selected range is greater than the set threshold, the wind tunnel core control software automatically uses the total pressure sensor of a higher range as the total pressure sensor of the selected range, and uses the total pressure sensor value of a higher range as the total pressure control feedback value;

[0011] S50. Repeat step S40 until the test is finished.

[0012] Furthermore, there are 2 to 4 total pressure sensors with different ranges in the S10, and the number of the total pressure sensors is proportional to the total pressure range and the required measurement accuracy.

[0013] Furthermore, the specific process of the first calculation and judgment in step S30 is as follows:

[0014] S301. Define the following variables: SPi (i=1, 2, ...) represents the ith total pressure sensor; Pi represents the maximum range of the ith total pressure sensor; Vi represents the electromagnetic on-off valve connected to the ith total pressure sensor; P0 represents the target total pressure value issued by the operation management system;

[0015] S302. Determine whether P0 is greater than 0 and less than the maximum total pressure value allowed by the wind tunnel. If so, execute step S303; if not, execute step S307;

[0016] S303. Take i=1, P=P0×1.2;

[0017] S304. If P < Pi, execute step S306; otherwise, execute step S305;

[0018] S305. Take i=i+1 and execute step S304;

[0019] S306. Mark SPi as the total pressure control feedback sensor, open the electromagnetic on-off valve of Vj (j=i, i+1, ...), close the electromagnetic on-off valve of Vk (k=i-1, i-2, ... and k>0), and end the calculation and judgment process;

[0020] S307. Alarm to remind the user that the target total pressure value input is wrong, and end the calculation and judgment process.

[0021] Furthermore, the specific process of the second calculation and judgment in step S40 is as follows:

[0022] S401. Define variables: P0i represents the ith total pressure control value; P0max represents the maximum range total pressure sensor value; the wind tunnel core controller collects all total pressure sensor values;

[0023] S402: Determine whether the test is in progress. If so, execute step S403. If not, terminate the calculation and determination process.

[0024] S403: Determine whether the difference between P0max and the current measured value P0i of the total pressure control feedback sensor SPi is greater than a threshold value, if so, execute step S404, if not, execute step S402;

[0025] S404: take i=i+1, mark SPi as the total pressure control feedback sensor, and then execute step S402;

[0026] Furthermore, the threshold in step S40 is 2 kPa to 5 kPa.

[0027] The automatic range selection and fault-tolerance method of the total pressure sensor of a high-speed wind tunnel of the present invention issues the test conditions through the wind tunnel operation management computer, and the wind tunnel core controller automatically selects the total pressure sensor of the appropriate range according to the size of the target total pressure value, closes the electromagnetic on-off valve of the total pressure sensor gas circuit that is smaller than the appropriate range, and opens the electromagnetic on-off valve of the total pressure sensor gas circuit of the appropriate range and above. After the test starts, the wind tunnel core controller collects the readings of all the total pressure sensors of the opened range. If the difference between the measured value of the total pressure sensor of the maximum range and the measured value of the total pressure sensor of the selected range is greater than the set threshold, the wind tunnel core control software automatically uses the measured value of the total pressure sensor of the higher range as the total pressure control feedback value. The automatic range selection and fault-tolerance method of the total pressure sensor of a high-speed wind tunnel of the present invention realizes the automatic selection of the total pressure sensor range, reduces the workload of manual operation and avoids operating errors, and at the same time avoids the total pressure feedback error problem caused by software and hardware failures, ensuring the safe conduct of the wind tunnel test. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the related components used in the automatic range selection and fault tolerance method of the high-speed wind tunnel total pressure sensor of the present invention;

[0029] Figure 2 It is a flow chart of automatic selection of the total pressure sensor range in the automatic selection and fault tolerance method of the total pressure sensor range of a high-speed wind tunnel of the present invention;

[0030] Figure 3The present invention is a flow chart of total pressure sensor range selection fault tolerance judgment in the high-speed wind tunnel total pressure sensor range automatic selection and fault tolerance method of the present invention. DETAILED DESCRIPTION

[0031] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0032] The automatic range selection and fault tolerance method of the high-speed wind tunnel total pressure sensor of the present invention comprises the following steps:

[0033] S10. Figure 1 As shown, the measuring ends of several total pressure sensors with different measuring ranges are connected to the total pressure gas path of the wind tunnel through the corresponding electromagnetic on-off valves, and the output ends are connected to the data acquisition unit of the wind tunnel core controller; the control end of the electromagnetic on-off valve is connected to the digital output unit of the wind tunnel core controller, and the wind tunnel operation management computer is connected to the wind tunnel core controller via Ethernet;

[0034] S20. Before the test, the wind tunnel operation management computer sends the test conditions, including the target total pressure value, to the wind tunnel core controller via Ethernet;

[0035] S30. The wind tunnel core control software performs the first calculation and judgment according to the target total pressure value, and determines the total pressure sensor with a range greater than the target total pressure value as the total pressure control feedback sensor; the wind tunnel core controller outputs a control signal to open the total pressure sensor with the selected range and the electromagnetic on-off valve connected to the total pressure sensor with a larger range than the selected range, and close the electromagnetic on-off valve connected to the total pressure sensor with a smaller range than the selected range;

[0036] S40. During the test, the wind tunnel core controller collects signals from all turned-on total pressure sensors, and performs a second calculation and judgment. If the difference between the total pressure sensor value of the maximum range and the total pressure sensor value of the selected range is greater than the set threshold, the wind tunnel core control software automatically uses the total pressure sensor of a higher range as the total pressure sensor of the selected range, and uses the total pressure sensor value of a higher range as the total pressure control feedback value;

[0037] S50. Repeat step S40 until the test is finished.

[0038] Furthermore, there are 2 to 4 total pressure sensors with different ranges in the S10, and the number of the total pressure sensors is proportional to the total pressure range and the required measurement accuracy.

[0039] Furthermore, if Figure 2 As shown, the specific process of the first calculation and judgment in step S30 is as follows:

[0040] S301. Define the following variables: SPi (i=1, 2, ...) represents the ith total pressure sensor; Pi represents the maximum range of the ith total pressure sensor; Vi represents the electromagnetic on-off valve connected to the ith total pressure sensor; P0 represents the target total pressure value issued by the operation management system;

[0041] S302. Determine whether P0 is greater than 0 and less than the maximum total pressure value allowed by the wind tunnel. If so, execute step S303; if not, execute step S307;

[0042] S303. Take i=1, P=P0×1.2;

[0043] S304. If P < Pi, execute step S306; otherwise, execute step S305;

[0044] S305. Take i=i+1 and execute step S304;

[0045] S306. Mark SPi as the total pressure control feedback sensor, open the electromagnetic on-off valve of Vj (j=i, i+1, ...), close the electromagnetic on-off valve of Vk (k=i-1, i-2, ... and k>0), and end the calculation and judgment process;

[0046] S307. Alarm to remind the user that the target total pressure value input is wrong, and end the calculation and judgment process.

[0047] Furthermore, if Figure 3 As shown, the specific process of the second calculation and judgment in step S40 is as follows:

[0048] S401. Define variables: P0i represents the ith total pressure control value; P0max represents the maximum range total pressure sensor value; the wind tunnel core controller collects all total pressure sensor values;

[0049] S402: Determine whether the test is in progress. If so, execute step S403. If not, terminate the calculation and determination process.

[0050] S403: Determine whether the difference between P0max and the current measured value P0i of the total pressure control feedback sensor SPi is greater than a threshold value, if so, execute step S404, if not, execute step S402;

[0051] S404: take i=i+1, mark SPi as the total pressure control feedback sensor, and then execute step S402;

[0052] Furthermore, the threshold in step S40 is 2 kPa to 5 kPa.

[0053] Example 1

[0054] The automatic range selection and fault tolerance method of the wind tunnel total pressure sensor in this embodiment is as follows:

[0055] a. The wind tunnel operation management computer is connected to the wind tunnel core controller through a network switch. A total of three ranges of total pressure sensors are set. The range of total pressure sensor 1 is 345kPa, the range of total pressure sensor 2 is 689kPa, and the range of total pressure sensor 3 is 1723kPa. The input ends of total pressure sensors 1 to 3 are connected to the total pressure gas circuit through electromagnetic on-off valves 1 to 3 respectively, and the output ends of total pressure sensors 1 to 3 are connected to the wind tunnel core controller; the wind tunnel core controller is connected to the control ends of electromagnetic on-off valves 1 to 3;

[0056] b. Before the test, the wind tunnel operation management computer sends the test conditions, including the target total pressure value, such as 413 kPa, to the wind tunnel core controller through the network switch;

[0057] c. The wind tunnel core controller determines the total pressure sensor with the appropriate range according to the target total pressure. Generally, a total pressure sensor with a range not exceeding 1.2 times the target total pressure is selected. For example, if the target total pressure is 413 kPa, a total pressure sensor 2 with a range of 689 kPa is selected.

[0058] d. The wind tunnel core controller closes the electromagnetic on-off valve 1 connected to the total pressure sensor 1 according to the selected range of the total pressure sensor, and opens the electromagnetic on-off valve 2 and the electromagnetic on-off valve 3 connected to the selected range of the total pressure sensor 2 and the higher range of the total pressure sensor 3 respectively;

[0059] e. After the test starts, the wind tunnel core controller collects the measured values ​​of total pressure sensors 1 to 3. If the difference between the measured value of total pressure sensor 3 with the highest range and the measured value of total pressure sensor 2 currently used as the total pressure feedback is greater than 3 kPa, the wind tunnel core controller uses total pressure sensor 3 as the total pressure sensor of the selected range and uses the measured value of total pressure sensor 3 as the total pressure feedback value.

[0060] e. Repeat step d until the test is completed.

[0061] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and implementation modes. For those familiar with the art, all features disclosed in the present invention, or steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can be combined in any way without departing from the principles of the present invention. The present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A method for automatic range selection and fault tolerance of a high-speed wind tunnel total pressure sensor, characterized in that: The following steps are involved: S10. Connect the measuring ends of several total pressure sensors with different measuring ranges to the total pressure gas path of the wind tunnel through the corresponding electromagnetic on-off valves, and connect the output ends to the data acquisition unit of the wind tunnel core controller; connect the control end of the electromagnetic on-off valve to the digital output unit of the wind tunnel core controller, and connect the wind tunnel operation management computer to the wind tunnel core controller via Ethernet; S20. Before the test, the wind tunnel operation management computer sends the test conditions, including the target total pressure value, to the wind tunnel core controller via Ethernet; S30. The wind tunnel core control software performs the first calculation and judgment according to the target total pressure value, and determines the total pressure sensor with a range greater than the target total pressure value as the total pressure control feedback sensor; the wind tunnel core controller outputs a control signal to open the total pressure sensor with the selected range and the electromagnetic on-off valve connected to the total pressure sensor with a larger range than the selected range, and close the electromagnetic on-off valve connected to the total pressure sensor with a smaller range than the selected range; S301. Define the following variables: SPi (i=1, 2, ...) represents the ith total pressure sensor; Pi represents the maximum range of the ith total pressure sensor; Vi represents the electromagnetic on-off valve connected to the ith total pressure sensor; P0 represents the target total pressure value issued by the operation management system; S302. Determine whether P0 is greater than 0 and less than the maximum total pressure value allowed by the wind tunnel. If so, execute step S303; if not, execute step S307; S303. Take i=1, P=P0×1.2; S304. If P < Pi, execute step S306; otherwise, execute step S305; S305. Take i=i+1 and execute step S304; S306. Mark SPi as the total pressure control feedback sensor, open the electromagnetic on-off valve of Vj (j=i, i+1, ...), close the electromagnetic on-off valve of Vk (k=i-1, i-2, ... and k>0), and end the calculation and judgment process; S307. Alarm, prompting the user that the target total pressure value is entered incorrectly, and the calculation and judgment process ends; S40. During the test, the wind tunnel core controller collects signals from all turned-on total pressure sensors, and performs a second calculation and judgment. If the difference between the total pressure sensor value of the maximum range and the total pressure sensor value of the selected range is greater than the set threshold, the wind tunnel core control software automatically uses the total pressure sensor of a higher range as the total pressure sensor of the selected range, and uses the total pressure sensor value of a higher range as the total pressure control feedback value; S401. Define variables: P0i represents the ith total pressure control value; P0max represents the maximum range total pressure sensor value; The wind tunnel core controller collects all total pressure sensor measurements; S402: Determine whether the test is in progress. If so, execute step S403. If not, terminate the calculation and determination process. S403: Determine whether the difference between P0max and the current measured value P0i of the total pressure control feedback sensor SPi is greater than a threshold value, if so, execute step S404, if not, execute step S402; S404: set i=i+1, mark SPi as the total pressure control feedback sensor, and then execute step S402; S50. Repeat step S40 until the test is finished.

2. The method for automatic range selection and fault tolerance of a high-speed wind tunnel total pressure sensor according to claim 1 is characterized in that: In the step S10, there are 2 to 4 total pressure sensors with different measuring ranges, and the number of the total pressure sensors is proportional to the total pressure range and the required measurement accuracy.

3. The method for automatic range selection and fault tolerance of a high-speed wind tunnel total pressure sensor according to claim 1 is characterized in that: The threshold in step S40 is 2 kPa to 5 kPa.

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