CN113447234A - Wind tunnel electronic pressure scanning valve traceability device and traceability method thereof - Google Patents
Wind tunnel electronic pressure scanning valve traceability device and traceability method thereof Download PDFInfo
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Abstract
The invention provides a wind tunnel electronic pressure scanning valve tracing device and a tracing method thereof, wherein the scheme comprises a standard instrument, a pressure source, a pressure pump and an electronic pressure scanning valve, wherein the standard instrument is adopted to replace a pressure calibration unit of the electronic pressure scanning valve and is used as a calibration device of the electronic pressure scanning valve; the pressure difference is obtained by comparing the difference between the value of the standard instrument in the gas path and the value detected by the combined pressure unit, and the electronic pressure scanning valve is calibrated by adopting a direct measurement method. According to the method, the source tracing method of the electronic pressure scanning valve of the wind tunnel common model is provided by combining the use condition of the current wind tunnel electronic pressure scanning valve, the source tracing chain is clear, and the feasibility is strong. The method breaks through the limitation that the electronic pressure scanning valve cannot trace the source of the value without a tracing channel, solves the problem of tracing the source of the static pressure value of the electronic pressure scanning valve, and ensures the accuracy and reliability of the measurement result of the control or measurement aerodynamic test of the wind tunnel multichannel electronic pressure scanning valve.
Description
Technical Field
The invention relates to the technical field of metering, in particular to a wind tunnel electronic pressure scanning valve traceability device and a traceability method thereof.
Background
A wind tunnel electronic pressure scanning valve device or a measurement system (hereinafter referred to as an electronic pressure scanning valve) is a set of highly integrated, highly modularized and highly accurate data acquisition and measurement system integrating electronics and precision machinery, and generally comprises a combined pressure sensor, a system processor, a central control computer, a pressure calibration unit and the like (as shown in fig. 1). The electronic pressure scanning valve models frequently used in aerodynamic force tests and research work comprise DSM3400, DSM3200, PSI8400DTC, PSI9116 and the like, the pressure measuring range is 5-500 kPa (differential pressure), and the measurement uncertainty is 0.03-0.09% (k is 2). Although the pressure calibration unit of the electronic pressure scanning valve can provide a standard pressure value for the electronic pressure scanning valve and has an internal pressure parameter self-checking function, most of the electronic pressure scanning valves used in the wind tunnel test are imported devices, the devices are only detected by manufacturers during purchasing, reference values such as atmospheric pressure, gravity acceleration and the like cannot be effectively adjusted according to local numerical values, no strict and effective pressure value tracing way and method exist, the accuracy and reliability of a measurement result cannot be guaranteed, and the potential safety hazard of using measurement data exists. Therefore, research on a source tracing method of the wind tunnel test electronic pressure scanning valve is urgently needed, a source tracing device is established, a quantity value source tracing mode of the electronic pressure scanning valve is solved, a technical basis is provided for evaluating the technical performance of the electronic pressure scanning valve, and the performance characteristic parameters of an aerodynamic test model (or a real object) and the quality of a data result are ensured.
Disclosure of Invention
The invention aims to overcome the technical problems and provides a wind tunnel electronic pressure scanning valve traceability method based on a digital/piston pressure gauge, which can solve the problem that the wind tunnel is commonly used for calibrating and tracing the pressure of electronic pressure scanning valves of various types and ensure the accurate and reliable measurement value.
The method calculates the basic error by tracing the value of the static parameters such as the zero drift, the stability, the indicating error, the return error and the like of the electronic pressure scanning valve commonly used in the wind tunnel, thereby realizing the tracing of the pressure value of the electronic pressure scanning valve.
The scheme is realized by the following technical measures:
a wind tunnel electronic pressure scanning valve tracing device comprises a standard instrument, a pressure source, a pressure pump and an electronic pressure scanning valve; the electronic pressure scanning valve comprises a combined pressure unit and a data processing unit inside; the standard instrument is respectively communicated with the pressure source, the pressure pump and the combined pressure unit through the gas path pipeline; the pressure source is used for conveying gas to the inside of the whole gas path; the pressure pump is used for increasing or decreasing the gas pressure in the gas path; the standard instrument can read the pressure value in the gas circuit; the combined pressure unit can transmit a pressure signal in the gas path to the data processing unit; the data processing unit can output and display the pressure value in the gas circuit according to the received electric signal.
The scheme is preferably as follows: the standard instrument is a piston type pressure gauge or a digital pressure calibration/controller, and the pressure measuring range is as follows: 0-700 kPa, uncertainty: 0.01%, and k is 2.
The scheme is preferably as follows: the combined pressure unit comprises 16-64 channels.
A wind tunnel electronic pressure scanning valve tracing method comprises the following steps:
a. in combination with the actual working condition of the electronic pressure scanning valve, a standard instrument is adopted to replace a pressure calibration unit of the electronic pressure scanning valve and serve as a calibration device of the electronic pressure scanning valve;
b. the pressure difference is obtained by comparing the difference between the value of the standard instrument in the gas path and the value detected by the combined pressure unit, and the electronic pressure scanning valve is calibrated by adopting a direct measurement method.
The scheme is preferably as follows: the specific implementation method of the step a comprises the following steps: and the standard instrument and the combined pressure unit in the electronic pressure scanning valve are communicated in the same air path.
The scheme is preferably as follows: the calibration process of the step b specifically comprises the following steps:
b1, determining that the electronic pressure scanning valve is influenced by temperature change, atmospheric pressure change, power supply voltage instability and other factors, and the change of the static working pressure point causes zero output deviation to fluctuate up and down to generate zero drift, and calculating according to the formula (1):
P0＝max(P0i)………………………………………………(1)
in the formula, P0For zero drift, P0iThe pressure values of the measuring points of each channel in the electronic pressure scanning are obtained;
b2, determining the difference between the measured value and the actual value indicated by the electronic pressure scanning valve, namely the indicating value error, and calculating according to the formula (2):
ΔpWi＝pDi-psi………………………………………………(2)
in the formula,. DELTA.pWiThe difference between the indication value of each measuring point of the electronic pressure scanning valve and the indication value of a standard instrument;
pDimeasuring the positive and negative stroke of each measuring point of the electronic pressure scanning valve;
psimeasured values of each point of a standard instrument;
b3, determining the variation of the static metering characteristic of the electronic pressure scanning valve along with the variation of time, and calculating according to the formula (3):
ΔWi＝|ΔpWi-Δpi|……………………………………………(3)
in the formula,. DELTA.WiThe stability of the indication value between two adjacent tracing of the pressure scanning valve is obtained;
Δpithe difference between the positive and negative travel indication values of each point in the last time tracing certificate and the indication value of the calibrating instrument;
ΔpWithe difference between the indication value of each measuring point of the electronic pressure scanning valve and the indication value of a standard instrument;
b4, determining the indication value deviation, namely the return error, caused by different stroke directions of the same measuring point due to the structural reason under the same condition of the electronic scanning valve;
taking the maximum absolute value of the difference between the positive stroke indication value and the negative stroke indication value on each measuring point as the return stroke error of the electronic pressure scanning valve, and calculating according to the formula (4):
Δpgo back to＝max(|pD is i-pD returns i|)…………………………………(4)
In the formula,. DELTA.pGo back toScanning the return error of the valve for the electronic pressure;
pd is iThe measured value is the positive stroke measured value of the ith point of the electronic pressure scanning valve;
pd returns iIs the measured value of the return stroke of the ith point of the electronic pressure scanning valve.
The scheme is preferably as follows: the calibration process of step b1 specifically includes the following steps:
the electronic pressure scanning valve is normally connected with a gas circuit pipeline of a standard instrument after being placed for 2.5 hours at least in a tracing environment, and is electrified and preheated for more than 0.5 hour after no leakage is detected;
closing the gas circuit valve, and performing a pressure boosting or evacuation test on the whole connected device for at least 3 times, wherein the pressure boosting or evacuation and the pressure reduction or pressure boosting in the calibration process are stable, impact is not allowed, and the overpressure phenomenon is avoided;
opening the gas path valve, stopping the gas source and the gas pump, enabling the standard instrument to be in a zero position, adjusting a zero position adjusting device of the electronic pressure scanning valve, adjusting the initial value to zero, recording a display value every 15 minutes for more than 6 times, taking the absolute value with the maximum as a zero position error, and taking the absolute value of the difference value between each reading and the initial value as a zero position drift if the electronic pressure scanning valve has no zero adjusting device.
The scheme is preferably as follows: the calibration process of step b2 specifically includes the following steps:
and (3) opening an air source and an air pump, controlling a standard instrument to perform at least 3 times of forward and reverse stroke indication error measurement on the electronic pressure scanning valve under the condition of no adjustment, and calculating according to a formula (2) to obtain forward and reverse stroke indication errors of each measurement point.
The scheme is preferably as follows: in step b2, if the indication value of the electronic pressure scanning valve is out of tolerance, the indication value of the electronic pressure scanning valve can be adjusted to be within a qualified range through a self-calibration device of the electronic pressure scanning valve or other adjusting devices by an upper and lower limit adjusting method, and then the indication value error measurement is carried out again until the indication value errors of all measuring points are not out of tolerance;
when the indication error of the electronic pressure scanning valve of the one-way differential pressure is measured, the low-pressure end (L) is communicated with the atmosphere, and the high-pressure end (H) is connected with a calibration instrument;
when the indicating value error of the electronic pressure scanning valve with the bidirectional differential pressure is measured, the low-pressure end (L) is firstly communicated with the atmosphere, the high-pressure end (H) is connected with the calibrating instrument, then the high-pressure end (H) is communicated with the atmosphere, and the low-pressure end (L) is connected with the calibrating instrument.
The method has the advantages that the method can be known according to the description of the scheme, the electronic pressure scanning valve traceability method of the wind tunnel common model is provided by combining the use condition of the current wind tunnel electronic pressure scanning valve, the traceability chain is clear, and the feasibility is strong. The method breaks through the limitation that the electronic pressure scanning valve cannot trace the source of the value without a tracing channel, solves the problem of tracing the source of the static pressure value of the electronic pressure scanning valve, and ensures the accuracy and reliability of the measurement result of the control or measurement aerodynamic test of the wind tunnel multichannel electronic pressure scanning valve.
Therefore, compared with the prior art, the invention has prominent substantive features and remarkable progress, and the beneficial effects of the implementation are also obvious.
Drawings
Fig. 1 is a schematic structural diagram of a tracing apparatus according to the present invention.
Detailed Description
As can be seen from the attached drawings, the scheme comprises a standard instrument, a pressure source, a pressure pump and an electronic pressure scanning valve; the electronic pressure scanning valve comprises a combined pressure unit and a data processing unit inside; the standard instrument is respectively communicated with the pressure source, the pressure pump and the combined pressure unit through the gas path pipeline; the pressure source is used for conveying gas to the inside of the whole gas path; the pressure pump is used for increasing or decreasing the gas pressure in the gas path; the standard instrument can read the pressure value in the gas circuit; the combined pressure unit can transmit a pressure signal in the gas path to the data processing unit; the data processing unit can output and display the pressure value in the gas circuit according to the received electric signal.
The standard instrument is a piston type pressure gauge or a digital pressure calibration/controller, and the pressure measuring range is as follows: 0-700 kPa, uncertainty: 0.01%, and k is 2.
The combined pressure unit comprises 16-64 channels.
The method for tracing the source of the wind tunnel electronic pressure scanning valve by adopting the instrument comprises the following steps:
a. in combination with the actual working condition of the electronic pressure scanning valve, a standard instrument is adopted to replace a pressure calibration unit of the electronic pressure scanning valve and serve as a calibration device of the electronic pressure scanning valve;
b. the pressure difference is obtained by comparing the difference between the value of the standard instrument in the gas path and the value detected by the combined pressure unit, and the electronic pressure scanning valve is calibrated by adopting a direct measurement method.
The scheme is preferably as follows: the specific implementation method of the step a comprises the following steps: and the standard instrument and the combined pressure unit in the electronic pressure scanning valve are communicated in the same air path.
The calibration process of the step b specifically comprises the following steps:
b1, determining that the electronic pressure scanning valve is influenced by temperature change, atmospheric pressure change, power supply voltage instability and other factors, and the change of the static working pressure point causes zero output deviation to fluctuate up and down to generate zero drift, and calculating according to the formula (1):
P0＝max(P0i)………………………………………………(1)
in the formula, P0For zero drift, P0iThe pressure values of the measuring points of each channel in the electronic pressure scanning are obtained;
b2, determining the difference between the measured value and the actual value indicated by the electronic pressure scanning valve, namely the indicating value error, and calculating according to the formula (2):
ΔpWi＝pDi-psi………………………………………………(2)
in the formula,. DELTA.pWiThe difference between the indication value of each measuring point of the electronic pressure scanning valve and the indication value of a standard instrument;
pDimeasuring the positive and negative stroke of each measuring point of the electronic pressure scanning valve;
psimeasured values of each point of a standard instrument;
b3, determining the variation of the static metering characteristic of the electronic pressure scanning valve along with the variation of time, and calculating according to the formula (3):
ΔWi＝|ΔpWi-Δpi|……………………………………………(3)
in the formula,. DELTA.WiThe stability of the indication value between two adjacent tracing of the pressure scanning valve is obtained;
Δpithe difference between the positive and negative travel indication values of each point in the last time tracing certificate and the indication value of the calibrating instrument;
ΔpWithe difference between the indication value of each measuring point of the electronic pressure scanning valve and the indication value of a standard instrument;
b4, determining the indication value deviation, namely the return error, caused by different stroke directions of the same measuring point due to the structural reason under the same condition of the electronic scanning valve;
taking the maximum absolute value of the difference between the positive stroke indication value and the negative stroke indication value on each measuring point as the return stroke error of the electronic pressure scanning valve, and calculating according to the formula (4):
Δpgo back to＝max(|pD is i-pD returns i|)…………………………………(4)
In the formula,. DELTA.pGo back toScanning the return error of the valve for the electronic pressure;
pd is iThe measured value is the positive stroke measured value of the ith point of the electronic pressure scanning valve;
pd returns iIs the measured value of the return stroke of the ith point of the electronic pressure scanning valve.
Preferably, the calibration process of step b1 specifically includes the following steps:
the electronic pressure scanning valve is normally connected with a gas circuit pipeline of a standard instrument after being placed for 2.5 hours at least in a tracing environment, and is electrified and preheated for more than 0.5 hour after no leakage is detected;
closing the gas circuit valve, and performing a pressure boosting or evacuation test on the whole connected device for at least 3 times, wherein the pressure boosting or evacuation and the pressure reduction or pressure boosting in the calibration process are stable, impact is not allowed, and the overpressure phenomenon is avoided;
opening the gas path valve, stopping the gas source and the gas pump, enabling the standard instrument to be in a zero position, adjusting a zero position adjusting device of the electronic pressure scanning valve, adjusting the initial value to zero, recording a display value every 15 minutes for more than 6 times, taking the absolute value with the maximum as a zero position error, and taking the absolute value of the difference value between each reading and the initial value as a zero position drift if the electronic pressure scanning valve has no zero adjusting device.
Preferably, the calibration process of step b2 specifically includes the following steps:
and (3) opening an air source and an air pump, controlling a standard instrument to perform at least 3 times of forward and reverse stroke indication error measurement on the electronic pressure scanning valve under the condition of no adjustment, and calculating according to a formula (2) to obtain forward and reverse stroke indication errors of each measurement point.
Preferably, in step b2, if the indication value of the electronic pressure scanning valve is found to be out of tolerance, the indication value of the electronic pressure scanning valve can be adjusted to be within the qualified range by a self-calibration device of the electronic pressure scanning valve or other adjusting devices through an upper and lower limit adjusting method, and then the indication value error measurement is performed again until the indication value errors of all the measuring points are not out of tolerance;
when the indication error of the electronic pressure scanning valve of the one-way differential pressure is measured, the low-pressure end (L) is communicated with the atmosphere, and the high-pressure end (H) is connected with a calibration instrument;
when the indicating value error of the electronic pressure scanning valve with the bidirectional differential pressure is measured, the low-pressure end (L) is firstly communicated with the atmosphere, the high-pressure end (H) is connected with the calibrating instrument, then the high-pressure end (H) is communicated with the atmosphere, and the low-pressure end (L) is connected with the calibrating instrument.
The actual measurement effect is as follows:
the method is characterized in that a PPC4 digital pressure controller is adopted, the working range A is 700kPa/A200kPa, the source tracing certificate number is RGpv2014-2932, the uncertainty is 0.01% (k is 2), under the condition of meeting the environmental requirement, the value tracing is respectively carried out on the electronic pressure scanning valves of two types of PSI9116 and PSID7152 and three different ranges, and the test result is shown in tables 1, 2 and 3.
TABLE 1 field test results 1
TABLE 2 field test results (II)
TABLE 3 field test results (III)
According to the test data and the test results, the PPC4 digital pressure controller is adopted to calibrate and measure the electronic pressure scanning valve, the selected standard instrument is reasonable, the technical approach and the calibration method are feasible, and the traceability requirement of the electronic pressure scanning valve in the wind tunnel test can be met.
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (9)
1. A wind tunnel electronic pressure scanning valve device of tracing to source, characterized by: comprises a standard instrument, a pressure source, a pressure pump and an electronic pressure scanning valve; the electronic pressure scanning valve comprises a combined pressure unit and a data processing unit inside; the standard instrument is respectively communicated with a pressure source, a pressure pump and a combined pressure unit through gas circuit pipelines; the pressure source is used for conveying gas to the inside of the whole gas path; the pressure pump is used for increasing or decreasing the gas pressure in the gas path; the standard instrument can read the pressure value in the gas path; the combined pressure unit can transmit a pressure signal in the gas path to the data processing unit; the data processing unit can output and display the pressure value in the gas circuit according to the received electric signal.
2. The wind tunnel electronic pressure scanning valve traceability device of claim 1, characterized in that: the standard instrument is a piston type pressure gauge or a digital pressure calibration/controller, and the pressure measuring range is as follows: 0-700 kPa, uncertainty: 0.01%, and k is 2.
3. The wind tunnel electronic pressure scanning valve traceability device of claim 1, characterized in that: the combined pressure unit comprises 16-64 channels.
4. A wind tunnel electronic pressure scanning valve tracing method is characterized in that: the method comprises the following steps:
a. in combination with the actual working condition of the electronic pressure scanning valve, a standard instrument is adopted to replace a pressure calibration unit of the electronic pressure scanning valve and serve as a calibration device of the electronic pressure scanning valve;
b. the pressure difference is obtained by comparing the difference between the value of the standard instrument in the gas path and the value detected by the combined pressure unit, and the electronic pressure scanning valve is calibrated by adopting a direct measurement method.
5. The method of claim 4, wherein: the specific implementation method of the step a comprises the following steps: and the standard instrument and the combined pressure unit in the electronic pressure scanning valve are communicated in the same air path.
6. The method of claim 4, wherein: the calibration process of the step b specifically comprises the following steps:
b1, determining that the electronic pressure scanning valve is influenced by temperature change, atmospheric pressure change, power supply voltage instability and other factors, and the change of the static working pressure point causes zero output deviation to fluctuate up and down to generate zero drift, and calculating according to the formula (1):
P0＝max(P0i)………………………………………………(1)
in the formula, P0For zero drift, P0iThe pressure values of the measuring points of each channel in the electronic pressure scanning are obtained;
b2, determining the difference between the measured value and the actual value indicated by the electronic pressure scanning valve, namely the indicating value error, and calculating according to the formula (2):
ΔpWi＝pDi-psi………………………………………………(2)
in the formula,. DELTA.pWiThe difference between the indication value of each measuring point of the electronic pressure scanning valve and the indication value of a standard instrument;
pDimeasuring the positive and negative stroke of each measuring point of the electronic pressure scanning valve;
psimeasured values of each point of a standard instrument;
b3, determining the variation of the static metering characteristic of the electronic pressure scanning valve along with the variation of time, and calculating according to the formula (3):
ΔWi＝|ΔpWi-Δpi|……………………………………………(3)
in the formula,. DELTA.WiThe stability of the indication value between two adjacent tracing of the pressure scanning valve is obtained;
Δpithe difference between the positive and negative travel indication values of each point in the last tracing certificate and the indication value of the calibrating instrument;
ΔpWithe difference between the indication value of each measuring point of the electronic pressure scanning valve and the indication value of a standard instrument;
b4, determining the indication value deviation, namely the return error, caused by different stroke directions of the same measuring point due to the structural reason under the same condition of the electronic scanning valve;
taking the maximum absolute value of the difference between the positive stroke indication value and the negative stroke indication value on each measuring point as the return stroke error of the electronic pressure scanning valve, and calculating according to the formula (4):
Δpgo back to＝max(|pD is i-pD returns i|)…………………………………(4)
In the formula,. DELTA.pGo back toScanning the return error of the valve for the electronic pressure;
pd is iThe measured value is the positive stroke measured value of the ith point of the electronic pressure scanning valve;
pd returns iIs the measured value of the return stroke of the ith point of the electronic pressure scanning valve.
7. The method of claim 6, wherein: the calibration process of step b1 specifically includes the following steps:
the electronic pressure scanning valve is normally connected with a gas circuit pipeline of a standard instrument after being placed for 2.5 hours at least in a tracing environment, and is electrified and preheated for more than 0.5 hour after no leakage is detected;
closing the gas circuit valve, and performing a pressure boosting or evacuation test on the whole connected device for at least 3 times, wherein the pressure boosting or evacuation and the pressure reduction or pressure boosting in the calibration process are stable, impact is not allowed, and the overpressure phenomenon is avoided;
opening the gas path valve, stopping the gas source and the gas pump, enabling the standard instrument to be in a zero position, adjusting a zero position adjusting device of the electronic pressure scanning valve, adjusting the initial value to zero, recording a display value every 15 minutes for more than 6 times, taking the absolute value with the maximum as a zero position error, and taking the absolute value of the difference value between each reading and the initial value as a zero position drift if the electronic pressure scanning valve has no zero adjusting device.
8. The method of claim 6, wherein: the calibration process of step b2 specifically includes the following steps:
and (3) opening an air source and an air pump, controlling a standard instrument to perform at least 3 times of forward and reverse stroke indication error measurement on the electronic pressure scanning valve under the condition of no adjustment, and calculating according to a formula (2) to obtain forward and reverse stroke indication errors of each measurement point.
9. The method of claim 6, wherein: in step b2, if the indication value of the electronic pressure scanning valve is found to be out of tolerance, the indication value of the electronic pressure scanning valve can be adjusted to be within a qualified range by a self-calibration device of the electronic pressure scanning valve or other adjusting devices through an upper and lower limit adjusting method, and then the indication value error measurement is carried out again until the indication value errors of all measuring points are not out of tolerance;
when the indication error of the electronic pressure scanning valve of the one-way differential pressure is measured, the low-pressure end (L) is communicated with the atmosphere, and the high-pressure end (H) is connected with a calibration instrument;
when the indicating value error of the electronic pressure scanning valve with the bidirectional differential pressure is measured, the low-pressure end (L) is firstly communicated with the atmosphere, the high-pressure end (H) is connected with the calibrating instrument, then the high-pressure end (H) is communicated with the atmosphere, and the low-pressure end (L) is connected with the calibrating instrument.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116067607A (en) * | 2023-03-14 | 2023-05-05 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Flat plate automatic calibration system for wind tunnel |
| CN116499699A (en) * | 2023-06-29 | 2023-07-28 | 中国航空工业集团公司沈阳空气动力研究所 | Continuous wind tunnel pressure measurement test data monitoring and correcting method |
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