CN114858050A - Dynamic strain actual measurement verification method and device of engine rotating member remote measurement system - Google Patents
Dynamic strain actual measurement verification method and device of engine rotating member remote measurement system Download PDFInfo
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- CN114858050A CN114858050A CN202210366705.XA CN202210366705A CN114858050A CN 114858050 A CN114858050 A CN 114858050A CN 202210366705 A CN202210366705 A CN 202210366705A CN 114858050 A CN114858050 A CN 114858050A
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- 238000005259 measurement Methods 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000012795 verification Methods 0.000 title claims description 9
- 238000004088 simulation Methods 0.000 claims abstract description 51
- 238000004364 calculation method Methods 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 3
- 238000012806 monitoring device Methods 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 description 3
- 238000011056 performance test Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/04—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness by measuring coordinates of points
- G01B21/042—Calibration or calibration artifacts
Abstract
The invention discloses a method and a device for verifying actual measurement of dynamic strain of a remote measuring system of an engine rotating member, wherein a dynamic strain simulation device is arranged on the remote measuring system of the engine rotating member; acquiring resistance values of a first resistor and a second resistor of the dynamic strain simulation device according to a standard dynamic strain value of the engine rotating member remote measurement system; adjusting the frequency of PWM (pulse-width modulation) waves emitted by a micro control unit in the dynamic strain simulation device according to the running frequency state of the engine rotating member remote measurement system, and controlling the opening and closing of an electronic switch; and (3) rotating the engine rotating member at a high speed, and comparing a calibration value obtained by the dynamic strain simulation device with an actual measurement value of the engine rotating member telemetering system to obtain a dynamic strain measurement channel error of the telemetering system. The invention can realize the evaluation of the performance of the dynamic strain measurement channel of the telemetering system under the condition of high-speed rotation.
Description
Technical Field
The invention belongs to the technical field of engines, and particularly relates to a dynamic strain actual measurement verification method and device for an engine rotating member telemetering system.
Background
The measurement of the parameters of the rotating parts of the engine is a key technology and bottleneck of engine test and test, and the measurement runs through the whole process of the structural strength test and the performance test of the engine. The structure strength examination, the service life evaluation, the performance test and the safety monitoring in the engine test all need to reliably measure the dynamic strain parameters of the rotating piece.
The remote measuring system is used as rotating member parameter acquisition and transmission equipment, has the advantages of flexible installation, long service life, small volume, multiple channels, light weight and the like, and is an advanced means for testing the dynamic strain of the rotating member of the aircraft engine.
However, when the telemetry system performs dynamic strain test detection on an engine rotating member, the telemetry system is evaluated by adopting a static detection device, and the performance of a dynamic strain measurement channel of the telemetry system cannot be evaluated under a high-speed rotation condition.
Disclosure of Invention
In order to solve the problems, the invention provides a method and a device for verifying the dynamic strain actual measurement of a telemetering system of an engine rotating member, which are used for judging the performance of a dynamic strain measurement channel of the telemetering system under the condition of high-speed rotation.
In order to achieve the purpose, the invention adopts the technical scheme that: a dynamic strain actual measurement verification method of an engine rotating member remote measurement system is characterized in that a dynamic strain simulation device is arranged on the engine rotating member remote measurement system, and the method comprises the following steps:
setting parameters of a dynamic strain simulation device: acquiring resistance values of a first resistor and a second resistor of the dynamic strain simulation device according to a standard dynamic strain value of the engine rotating member remote measurement system; adjusting the frequency of PWM (pulse-width modulation) waves emitted by a micro control unit in the dynamic strain simulation device according to the running frequency state of the engine rotating member remote measurement system, and controlling the opening and closing of an electronic switch;
and (4) operation verification: and (3) rotating the engine rotating member at a high speed, and comparing a calibration value obtained by the dynamic strain simulation device with an actual measurement value of the engine rotating member telemetering system to obtain a dynamic strain measurement channel error of the telemetering system.
Further, the resistance values of the first resistor and the second resistor of the dynamic strain simulation device are obtained according to the standard dynamic strain value of the engine rotating member remote measuring system, and the method comprises the following steps:
calculating by using a standard dynamic strain value of a remote measuring system of an engine rotating member to obtain a square wave dynamic strain amplitude corresponding to the resistor;
setting a first resistance value, and obtaining a dynamic strain resistance value through calculation according to a dynamic strain value corresponding to the resistor;
calculating according to the dynamic strain resistance value to obtain a total resistance value after the electronic switch is closed;
and calculating to obtain a second resistance value according to the total resistance value and the first resistance value.
Further, the resistance values of the first resistor and the second resistor of the dynamic strain simulation device are obtained according to the standard dynamic strain value of the engine rotating member remote measurement system, a resistance value-dynamic strain value corresponding table is established after multiple calculations, and the resistance values of the first resistor and the second resistor of the dynamic strain simulation device corresponding to the standard dynamic strain value are directly obtained from the resistance value-dynamic strain value corresponding table during simulation.
Further, according to the running frequency state of the engine rotating member telemetering system, the frequency of PWM (pulse-width modulation) waves emitted by a micro control unit in the dynamic strain simulation device is adjusted, and the method comprises the following steps:
acquiring an operating frequency section of an engine rotating member telemetering system in a dynamic strain detection state;
and extracting a test key point from the operating frequency section to be used as the frequency of the PWM (pulse-width modulation) wave sent by the micro control unit in the dynamic strain simulation device.
Further, the dynamic strain measurement channel error calculation method is as follows:
δ＝(M B -M C )/M B ；
wherein M is B Calibration values, M, obtained for dynamic strain simulation devices C The actual value of the system is telemetered to the engine rotating member.
In another aspect, the present invention further provides a device for verifying actual measurement of dynamic strain of a telemetry system for engine rotating parts, comprising: the dynamic strain simulation device is arranged on a telemetering system of the engine rotating piece and rotates together with the telemetering rotor, and the receiver and the computing equipment are arranged outside to receive a detection result;
the dynamic strain simulation apparatus includes: the remote monitoring device comprises a micro-control unit, a first resistor, a second resistor, an electronic switch, a power supply and a remote measuring transmitter; the first resistor, the second resistor and the telemetering transmitter are connected in parallel, an electronic switch is arranged on a branch of the second resistor, the micro control unit is connected with the electronic switch, and the power supply is connected with the micro control unit and the electronic switch;
the receiver adopts a remote measuring receiver which is in wireless communication with the remote measuring transmitter;
and the computing equipment compares the calibration value obtained by the dynamic strain simulation device with the measured value of the engine rotating member telemetering system to obtain the dynamic strain measurement channel error of the telemetering system.
Furthermore, the micro control unit is used for setting PWM waves generating different frequencies to control the opening and closing of the electronic switch;
and adjusting the frequency of PWM (pulse-width modulation) waves emitted by a micro-control unit in the dynamic strain simulation device according to the running frequency state of the engine rotating member remote measuring system.
Further, the resistance values of the first resistor and the second resistor are calculated according to the dynamic strain value required to be calibrated.
The beneficial effects of the technical scheme are as follows:
the device can be integrated on a remote measuring system and rotates together with a remote measuring rotor, and the remote measuring input-output relationship is determined by comparing the output value of the remote measuring channel with the output value of the dynamic strain simulation device, so that the performance of the dynamic strain channel of the remote measuring system is verified, and the evaluation of the performance of the dynamic strain measuring channel of the remote measuring system under the condition of high-speed rotation is realized.
Drawings
FIG. 1 is a schematic flow chart of a method for verifying actual measurement of dynamic strain of an engine rotating member telemetry system according to the present invention;
fig. 2 is a schematic structural diagram of a dynamic strain actual measurement verification device of an engine rotating member telemetry system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described with reference to the accompanying drawings.
In this embodiment, referring to fig. 1, the present invention provides a method for verifying actual measurement of dynamic strain of an engine rotating member telemetry system, where a dynamic strain simulation apparatus is disposed on the engine rotating member telemetry system, and the method includes the steps of:
setting parameters of a dynamic strain simulation device: acquiring resistance values of a first resistor and a second resistor of the dynamic strain simulation device according to a standard dynamic strain value of the engine rotating member remote measurement system; adjusting the frequency of PWM (pulse-width modulation) waves emitted by a micro control unit in the dynamic strain simulation device according to the running frequency state of the engine rotating member remote measurement system, and controlling the opening and closing of an electronic switch;
and (4) operation verification: and (3) rotating the engine rotating member at a high speed, and comparing a calibration value obtained by the dynamic strain simulation device with an actual measurement value of the engine rotating member telemetering system to obtain a dynamic strain measurement channel error of the telemetering system.
As an optimization scheme of the above embodiment, obtaining resistance values of a first resistor and a second resistor of a dynamic strain simulation device according to a standard dynamic strain value of an engine rotating member telemetry system comprises the following steps:
calculating a standard dynamic strain value of an engine rotating member telemetering system to obtain a square wave dynamic strain amplitude value corresponding to the resistor;
obtaining a dynamic strain resistance value through calculation according to a dynamic strain value corresponding to the resistor;
setting a first resistance value, and obtaining a total resistance value after the electronic switch is closed through calculation according to the dynamic strain resistance value;
and calculating to obtain a second resistance value according to the total resistance value and the first resistance value.
In the specific implementation:
calculating by using a standard dynamic strain value of an engine rotating member remote measuring system to obtain a square wave dynamic strain amplitude corresponding to the resistance:
wherein e is sin Is a standard dynamic strain value of an engine rotating member telemetering system;
setting a first resistance value, and obtaining a dynamic strain resistance value through calculation according to a dynamic strain value corresponding to the resistor:
ΔR＝(K×R A )e*10 -6 ；
wherein, the sensitivity coefficient K, K of the standard strain gauge can be 4, R A Is a first resistance value;
and (3) obtaining the total resistance value after the electronic switch is closed through calculation according to the dynamic strain resistance value:
R C ＝ΔR+R A ；
and calculating to obtain a second resistance value according to the total resistance value and the first resistance value:
when e is sin When the molecular weight is 656.9 mu epsilon, R is taken A 120 Ω to obtain e 730 μ ∈;
Δ R was obtained to 0.35 Ω, and R was obtained B ＝4.1kΩ。
Preferably, the resistance values of the first resistor and the second resistor of the dynamic strain simulation device are obtained according to the standard dynamic strain value of the engine rotating member remote measurement system, a resistance value-dynamic strain value corresponding table is established after multiple calculations, and the resistance values of the first resistor and the second resistor of the dynamic strain simulation device corresponding to the standard dynamic strain value are directly obtained from the resistance value-dynamic strain value corresponding table during simulation.
And (4) calculating according to the steps to obtain a resistance-dynamic strain value corresponding table as shown in table 1.
TABLE 1 different R A 、R B Dynamic strain value corresponding to value
As an optimization scheme of the embodiment, the frequency of PWM (pulse-width modulation) waves emitted by a micro control unit in the dynamic strain simulation device is adjusted according to the running frequency state of the engine rotating member telemetering system, and the method comprises the following steps:
acquiring an operating frequency section of an engine rotating member telemetering system in a dynamic strain detection state;
and extracting a test key point from the operating frequency section to be used as the frequency of the PWM (pulse-width modulation) wave sent by the micro control unit in the dynamic strain simulation device.
As an optimization scheme of the above embodiment, the dynamic strain measurement channel error calculation method is as follows:
δ＝(M B -M C )/M B ；
wherein M is B Calibration values, M, obtained for dynamic strain simulation devices C The actual value of the system is telemetered to the engine rotating member.
In specific implementation, the actual measurement values of the engine rotating member telemetering system under three groups of frequencies are respectively as follows: p1 ═ 500Hz, P2 ═ 3900Hz, P3 ═ 5000 Hz; and the calibration value obtained by the dynamic strain simulation device.
TABLE 2 calibration and actual measurement values
According to the error calculation method, the error value of the dynamic strain measurement channel is as follows: (656.9-648.4)/656.9 ═ 1.29%; from table 2, it can be seen that the channel error of the telemetry system is no more than 1.3%.
In order to cooperate with the realization of the method of the invention, based on the same inventive concept, as shown in fig. 2, the invention also provides a device for verifying the actual measurement of the dynamic strain of the engine rotating member telemetering system, which comprises: the dynamic strain simulation device is arranged on the engine rotating member remote measuring system and rotates together with the remote measuring rotor, and the receiver and the computing equipment are arranged outside to receive a detection result;
the dynamic strain simulation apparatus includes: the remote monitoring device comprises a micro-control unit, a first resistor, a second resistor, an electronic switch, a power supply and a remote measuring transmitter; the first resistor, the second resistor and the telemetering transmitter are connected in parallel, an electronic switch is arranged on a branch of the second resistor, the micro control unit is connected with the electronic switch, and the power supply is connected with the micro control unit and the electronic switch;
the receiver adopts a remote measuring receiver which is in wireless communication with the remote measuring transmitter;
and the computing equipment compares the calibration value obtained by the dynamic strain simulation device with the measured value of the engine rotating member telemetering system to obtain the dynamic strain measurement channel error of the telemetering system.
The micro control unit adopts a PIC10LF320 chip, and the PWM frequency can reach 200kHz at most. The electronic switch adopts a MAX4644 chip, the switching frequency can reach 50MHz at most, and the selection of whether the resistor R3 is connected with the resistor R2 is realized. The power supply adopts 3.3V voltage-stabilizing output to supply power for the micro control unit and the electronic switch.
The micro control unit is used for setting the PWM waves generating different frequencies to control the opening and closing of the electronic switch;
the frequency of PWM (pulse-width modulation) waves emitted by a micro-control unit in the dynamic strain simulation device is adjusted according to the running frequency state of the engine rotating member remote measuring system,
and the resistance values of the first resistor and the second resistor are calculated according to the dynamic strain value required to be calibrated.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A dynamic strain actual measurement verification method of an engine rotating member remote measurement system is characterized in that a dynamic strain simulation device is arranged on the engine rotating member remote measurement system, and comprises the following steps:
setting parameters of a dynamic strain simulation device: acquiring resistance values of a first resistor and a second resistor of the dynamic strain simulation device according to a standard dynamic strain value of the engine rotating member remote measurement system; adjusting the frequency of PWM (pulse-width modulation) waves emitted by a micro control unit in the dynamic strain simulation device according to the running frequency state of the engine rotating member remote measurement system, and controlling the opening and closing of an electronic switch;
and (4) operation verification: and (3) rotating the engine rotating member at a high speed, and comparing a calibration value obtained by the dynamic strain simulation device with an actual measurement value of the engine rotating member telemetering system to obtain a dynamic strain measurement channel error of the telemetering system.
2. The method for verifying the actual dynamic strain measurement of the engine rotating member telemetry system as claimed in claim 1, wherein the resistance values of the first resistor and the second resistor of the dynamic strain simulator are obtained according to a standard dynamic strain value of the engine rotating member telemetry system, and the method comprises the steps of:
calculating by using a standard dynamic strain value of a remote measuring system of an engine rotating member to obtain a square wave dynamic strain amplitude corresponding to the resistor;
setting a first resistance value, and obtaining a dynamic strain resistance value through calculation according to a dynamic strain value corresponding to the resistor;
calculating according to the dynamic strain resistance value to obtain a total resistance value after the electronic switch is closed;
and calculating to obtain a second resistance value according to the total resistance value and the first resistance value.
3. The method for verifying the actual measurement of the dynamic strain of the engine rotating member remote sensing system as claimed in claim 2, wherein the resistance values of the first resistor and the second resistor of the dynamic strain simulator are obtained according to the standard dynamic strain value of the engine rotating member remote sensing system, the resistance value-dynamic strain value correspondence table is established after a plurality of calculations, and the resistance values of the first resistor and the second resistor of the dynamic strain simulator corresponding to the corresponding standard dynamic strain value are directly obtained from the resistance value-dynamic strain value correspondence table during simulation.
4. The method for verifying the actual measurement of the dynamic strain of the engine rotating member telemetry system as claimed in claim 1, wherein the step of adjusting the frequency of the PWM wave emitted by the micro control unit in the dynamic strain simulation device according to the operating frequency state of the engine rotating member telemetry system comprises the steps of:
acquiring an operating frequency section of an engine rotating member telemetering system in a dynamic strain detection state;
and extracting a test key point from the operating frequency section to be used as the frequency of the PWM (pulse-width modulation) wave sent by the micro control unit in the dynamic strain simulation device.
5. The method for verifying the actual measurement of the dynamic strain of the engine rotating member telemetry system according to claim 1, wherein the error calculation method of the dynamic strain measurement channel is as follows:
δ＝(M B -M C )/M B ；
wherein M is B Calibration values, M, obtained for dynamic strain simulation devices C The actual value of the system is telemetered to the engine rotating member.
6. A device for verifying actual measurement of dynamic strain of an engine rotating member telemetry system, comprising: the dynamic strain simulation device is arranged on a telemetering system of the engine rotating piece and rotates together with the telemetering rotor, and the receiver and the computing equipment are arranged outside to receive a detection result;
the dynamic strain simulation apparatus includes: the remote monitoring device comprises a micro control unit, a first resistor, a second resistor, an electronic switch, a power supply and a remote measuring transmitter; the first resistor, the second resistor and the telemetering transmitter are connected in parallel, an electronic switch is arranged on a branch of the second resistor, the micro control unit is connected with the electronic switch, and the power supply is connected with the micro control unit and the electronic switch;
the receiver adopts a remote measuring receiver which is in wireless communication with the remote measuring transmitter;
and the computing equipment compares the calibration value obtained by the dynamic strain simulation device with the actual measurement value of the engine rotating member telemetering system to obtain the dynamic strain measurement channel error of the telemetering system.
7. The device for verifying the actual measurement of the dynamic strain of the engine rotating member telemetering system according to claim 6, wherein the micro control unit is used for setting the PWM waves generating different frequencies to control the opening and closing of the electronic switch;
and adjusting the frequency of PWM (pulse-width modulation) waves emitted by a micro-control unit in the dynamic strain simulation device according to the running frequency state of the engine rotating member remote measuring system.
8. The apparatus of claim 6, wherein the resistances of the first and second resistors are calculated based on a desired calibrated dynamic strain value.
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