CN102865915A - Device for measuring static frequency of movable blade of high-pressure compressor of gas turbine combined compressor - Google Patents
Device for measuring static frequency of movable blade of high-pressure compressor of gas turbine combined compressor Download PDFInfo
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- CN102865915A CN102865915A CN2012103271824A CN201210327182A CN102865915A CN 102865915 A CN102865915 A CN 102865915A CN 2012103271824 A CN2012103271824 A CN 2012103271824A CN 201210327182 A CN201210327182 A CN 201210327182A CN 102865915 A CN102865915 A CN 102865915A
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Abstract
The invention relates to a device for measuring the frequency of a movable blade of a compressor, and particularly relates to a device for measuring the static frequency of a movable blade of a high-pressure compressor of a gas turbine combined compressor. The device aims at solving the problem that the static frequency of the movable blade of the high-pressure compressor of the gas turbine combined compressor can not be measured in the prior art. The device comprises a hydraulic clamping device, a blade clamp, a vibration exciter, a vibration sensor, a data acquisition unit and a microcomputer, wherein the hydraulic clamping device supplies power to the blade clamp to clamp the movable blade; the vibration exciter is used for exciting the movable blade to be tested to produce vibration; the vibration sensor is used for converting the vibration amplitude of the movable blade into analog signals; the data acquisition unit is used for acquiring analog signals output by the vibration sensor; and the microcomputer is used for receiving digital signals output by the data acquisition unit, carrying out spectral analysis and spectral zoom and outputting the static frequency of the movable blade to be tested. The device is used for measuring the static frequency of the movable blade of the high-pressure compressor of the gas turbine combined compressor.
Description
Technical field
The present invention relates to a kind of device of measuring the compressor blade and blade frequency, be specifically related to a kind of device for measuring Compressor Set high pressure compressor for GH static frequency of blade.
Background technology
Impeller blade is one of the most key parts of turbine, flutter failure is the major reason that causes impeller blade to lose efficacy, therefore, the measurement of impeller blade natural frequency and the vibration shape thereof is the impeller blade manufacturing, the important process that must carry out in the maintenance process, will resonate when Natural Frequency of Blade is identical with excitation force frequency, cause the blade accident, before installing, new Compressor Set impeller blade must carry out measurement and the frequency modulation of static frequency (natural frequency of vibration or natural frequency), must carry out quiet frequency during old major overhaul measures, to judge whether blade root is loosening, whether there is crackle, therefore, the measurement of static frequency of blade has important impact for the safety that guarantees unit, because Compressor Set high-pressure compressor moving vane is short and small, the blade root form is unique, and the general measuring method that adopts at present can't carry out to the short and small moving vane of installing on the Compressor Set high-pressure compressor Measurement accuracy of quiet frequency.
Summary of the invention
The objective of the invention is to adopt prior art can not carry out the problem that quiet frequency is measured to Compressor Set high-pressure compressor moving vane for solving, and then a kind of device for measuring Compressor Set high pressure compressor for GH static frequency of blade is provided.
The present invention addresses the above problem the technical scheme of taking to be: a kind of device for measuring Compressor Set high pressure compressor for GH static frequency of blade of the present invention comprises hydraulic clamp, blade fixture, vibrator, vibration transducer, data acquisition unit and microcomputer
Described hydraulic clamp comprises base, thrust plate, portable plate and hydraulic cylinder, base is rectangle, thrust plate is rectangle, portable plate is rectangle, thrust plate is fixed on an end of the upper surface of base, and the long side surface of the Width of thrust plate is vertical with the broad side surface of the length direction of base, and hydraulic cylinder is fixed on the upper surface of base, the end of the piston rod of hydraulic cylinder is connected with the long side surface of the Width of portable plate, and portable plate and thrust plate have the gap over against setting and the two;
Described blade fixture comprises the first clamping element, the second clamping element and base plate, the shape of the first clamping element, the second clamping element and base plate is rectangle, the first clamping element is positioned on the upper surface of base plate and the two is slidingly connected, the second clamping element is fixedly connected on the upper surface of base plate, the first clamping element and the second clamping element are over against setting, the first clamping element and the second clamping element are used for fixing to clamp moving vane to be measured
In the gap of blade fixture between portable plate and thrust plate, and the second clamping element is connected with thrust plate, and the first clamping element is connected with portable plate, and hydraulic clamp provides power to realize clamping moving vane to blade fixture;
Vibrator is used for exciting moving vane to be measured and produces vibration;
Vibration transducer is used for the amplitude of the vibration of moving vane is changed into simulating signal;
Data acquisition unit is used for gathering the simulating signal of vibration transducer output, and described signal is carried out filtering, analog-to-digital conversion, obtains digital signal;
Microcomputer is used for the digital signal of receive data collector output, then, carries out spectrum analysis and frequency spectrum refinement, exports the quiet frequency of moving vane to be measured.
The invention has the beneficial effects as follows: the present invention is by the design of special-purpose blade fixture, the design of hydraulic clamp, solved its fixing unsettled problem, cooperate vibration transducer (high-frequency response sensor), effectively solved the problem of Compressor Set moving vane frequency measurement, the data of measuring accurately and reliably; Simultaneously the present invention utilizes the frequency dispersion degree to pass judgment on the static frequency value discrete case of expression one whole circle blade integral, the quiet frequency of the moving vane that assurance is measured is reliable and stable, the assurance pneumatic plant is stable, the generation of minimizing accident, represent whole circle blade frequencies dispersion degree with F, its computing method are as follows: F=2 * (f
Max-f
Min)/(f
Max+ f
Min) wherein: f
MaxRefer to the value of single blade frequencies value maximum in this whole circle blade of measurement, f
MinRefer to the value of single blade frequencies value minimum in this circle blade of measurement.When the frequency dispersion degree that calculates should be less than or equal to 6%, if exceed the frequency dispersion degree scope of calculating, choose the defective blade of frequency, order is changed blade on the notice, remeasure and calculate dispersion degree, should be less than or equal to 6% until all satisfy the frequency dispersion degree, namely qualified.The present invention has solved the problem of the 0th grade to the 10th grade compressor blade and blade static frequency measurement of first Compressor Set of design by the actual measurement Test Summary, measures accurately and reliably, and efficient quick, the frequency dispersion degree is less than 6%.
Description of drawings
Fig. 1 is the one-piece construction synoptic diagram of apparatus of the present invention, Fig. 2 is the main TV structure synoptic diagram of hydraulic clamp of the present invention, Fig. 3 is the left view of Fig. 2, Fig. 4 is the vertical view of Fig. 2, Fig. 5 is the main TV structure synoptic diagram of base, Fig. 6 is the vertical view of Fig. 5, Fig. 7 is the main TV structure synoptic diagram of portable plate, and Fig. 8 is the left view of Fig. 7, and Fig. 9 is the main TV structure synoptic diagram of thrust plate, Figure 10 is the left view of Fig. 9, Figure 11 is the main TV structure synoptic diagram of floor, and Figure 12 is the vertical view of Figure 11, and Figure 13 is blade fixture master TV structure synoptic diagram, Figure 14 is the left view of Figure 13, and Figure 15 is the vertical view of Figure 13.
Embodiment
Embodiment one: present embodiment is described in conjunction with Fig. 1～Figure 15, a kind of device for measuring Compressor Set high pressure compressor for GH static frequency of blade of present embodiment comprises hydraulic clamp A, blade fixture B, vibrator C, vibration transducer D, data acquisition unit E and microcomputer F
Described hydraulic clamp A comprises base 7, thrust plate 5, portable plate 2 and hydraulic cylinder 1, base 7 is rectangle, thrust plate 5 is rectangle, portable plate 2 is rectangle, thrust plate 5 is fixed on an end of the upper surface of base 7, the long side surface of the Width of thrust plate 5 is vertical with the broad side surface of the length direction of base 7, hydraulic cylinder 1 is fixed on the upper surface of base 7, the end of the piston rod of hydraulic cylinder 1 is connected with the long side surface of the Width of portable plate 2, and portable plate 2 has the gap with thrust plate 5 over against setting and the two;
Described blade fixture B comprises the first clamping element 8, the second clamping element 9 and base plate 10, the shape of the first clamping element 8, the second clamping element 9 and base plate 10 is rectangle, the first clamping element 9 is positioned on the upper surface of base plate 10 and the two is slidingly connected, the second clamping element 9 is fixedly connected on the upper surface of base plate 10, the first clamping element 8 and the second clamping element 9 are over against setting, the first clamping element 8 and the second clamping element 9 are used for fixing to clamp moving vane to be measured 11
In the gap of blade fixture B between portable plate 2 and thrust plate 5, and the second clamping element 9 is connected with thrust plate 5, and the first clamping element 8 is connected with portable plate 2, and hydraulic clamp A provides power to realize clamping moving vane 11 to blade fixture B;
Vibrator C is used for exciting moving vane 11 to be measured and produces vibration;
Vibration transducer D is used for the amplitude of the vibration of moving vane 11 is changed into simulating signal;
Data acquisition unit E is used for gathering the simulating signal of vibration transducer D output, and described signal is carried out filtering, analog-to-digital conversion, obtains digital signal;
Microcomputer F is used for the digital signal of receive data collector E output, then, carries out spectrum analysis and frequency spectrum refinement, exports the quiet frequency of moving vane 11 to be measured.
The vibrator of present embodiment can also adopt the vibrator of non-contact exciting power that moving vane is applied exciting force and produce vibration, and described vibrator can adopt rubber mallet to rap (tangentially direction) blade appropriate location, forms free vibration.
Present embodiment for blade comprise vertical tree-like, T shape, swallow-tail form, can be according to the vane type line form, the blade fixture frock is set, the design that matches with the vane type line form of the first clamping element and the clamping surface of the second clamping element, and then keep the clamped condition of blade.
In the digital signal input microcomputer internal memory that in the present embodiment data acquisition unit is gathered, carry out Fast Fourier Transform (FFT), change time-domain signal into frequency-region signal, the search Natural Frequency of Blade, then carry out the frequency refinement near natural frequency, center frequency value is corresponding static frequency of blade rate value.The microcomputer of present embodiment is preferentially selected PSA-C spectrum analyzer and supporting frequency measurement software.
Embodiment two: present embodiment is described in conjunction with Figure 14, the bottom surface of described the first clamping element 8 of present embodiment has dovetail groove 8-1, have the protrusion 10-1 that matches with dovetail groove 8-1 on the upper surface of base plate 10, the first clamping element 8 is slidingly connected by protrusion 10-1 and second clamping element 9 that can slide in dovetail groove 8-1.So arrange, it is reliable, stable to slide, and is convenient to clamp blade.Other is identical with embodiment one.
Embodiment three: present embodiment is described in conjunction with Fig. 2, Figure 11 and Figure 12, the described device of present embodiment also comprises floor 6, floor 6 be shaped as triangle, and a straight plate face of floor 6 is fixed on the upper surface of base 7, and the straight plate face of another of floor 7 is connected with the broad side surface of the length direction of thrust plate 5.So arrange, can strengthen improving stability and the bearing strength of thrust plate.Other is identical with embodiment one or two.
Embodiment four: in conjunction with Fig. 1 present embodiment is described, the described vibration transducer D of present embodiment is current vortex sensor.So arrange, can strengthen improving stability and the bearing strength of thrust plate.Other is identical with embodiment one or two.
Principle of work
The present invention is based on spectrum analysis and frequency spectrum refinement technology in the digital signal processing, according to vibration principle, utilize the Special clamp tool design, the hydraulic clamp design, the blade externally effect of periodicity exciting force can be subjected to clap vibration, after outside exciting force disappears, become damped free vibration, its free running frequency is each rank natural frequency of blade, blade vibration by measuring vibrations displacement or vibration acceleration, obtains time-domain signal, by data acquisition unit collection signal is inputted microcomputer, in the spectrum analysis data acquisition software, to analyze and obtain each rank natural frequency, center frequency value is corresponding static frequency of blade rate value.
Blade is subject to the effect of rotary centrifugal force during actual the use when work, blade clamps in diametric(al), carrying out moving vane when surveying quiet frequency, in order to simulate the actual centrifugal force that is subject to, carry out in advance the stressed simulation of centrifugal force, utilize fluid power clamp device and blade fixture frock that blade is fixed, carry out pressure control by hydraulic cylinder, after clamping, carry out exciting, and then by data acquisition, signal testing technology instrument (microcomputer) and its static frequency of blade rate of software analysis.
Claims (4)
1. device of be used for measuring Compressor Set high pressure compressor for GH static frequency of blade, it is characterized in that: described device comprises hydraulic clamp (A), blade fixture (B), vibrator (C), vibration transducer (D), data acquisition unit (E) and microcomputer (F)
Described hydraulic clamp (A) comprises base (7), thrust plate (5), portable plate (2) and hydraulic cylinder (1), base (7) is rectangle, thrust plate (5) is rectangle, portable plate (2) is rectangle, thrust plate (5) is fixed on an end of the upper surface of base (7), the long side surface of the Width of thrust plate (5) is vertical with the broad side surface of the length direction of base (7), hydraulic cylinder (1) is fixed on the upper surface of base (7), the end of the piston rod of hydraulic cylinder (1) is connected with the long side surface of the Width of portable plate (2), and portable plate (2) has the gap with thrust plate (5) over against setting and the two;
Described blade fixture (B) comprises the first clamping element (8), the second clamping element (9) and base plate (10), the first clamping element (8), the shape of the second clamping element (9) and base plate (10) is rectangle, the first clamping element (9) is positioned on the upper surface of base plate (10) and the two is slidingly connected, the second clamping element (9) is fixedly connected on the upper surface of base plate (10), the first clamping element (8) and the second clamping element (9) are over against setting, the first clamping element (8) and the second clamping element (9) are used for fixing to clamp moving vane to be measured (11)
Blade fixture (B) is positioned at the gap between portable plate (2) and the thrust plate (5), and the second clamping element (9) is connected with thrust plate (5), the first clamping element (8) is connected with portable plate (2), and hydraulic clamp (A) provides power to realize clamping moving vane (11) for blade fixture (B);
Vibrator (C) is used for exciting moving vane to be measured (11) and produces vibration;
Vibration transducer (D) is used for the amplitude of the vibration of moving vane (11) is changed into simulating signal;
Data acquisition unit (E) is used for gathering the simulating signal of vibration transducer (D) output, and described signal is carried out filtering, analog-to-digital conversion, obtains digital signal;
Microcomputer (F) is used for the digital signal of receive data collector (E) output, then, carries out spectrum analysis and frequency spectrum refinement, exports the quiet frequency of moving vane to be measured (11).
2. a kind of device for measuring Compressor Set high pressure compressor for GH static frequency of blade according to claim 1, it is characterized in that: the bottom surface of described the first clamping element (8) has dovetail groove (8-1), have the protrusion (10-1) that matches with dovetail groove (8-1) on the upper surface of base plate (10), the first clamping element (8) is slidingly connected with the second clamping element (9) by the protrusion (10-1) that can slide in dovetail groove (8-1).
3. a kind of device for measuring Compressor Set high pressure compressor for GH static frequency of blade according to claim 1 and 2, it is characterized in that: described device also comprises floor (6), floor (6) be shaped as triangle, and a straight plate face of floor (6) is fixed on the upper surface of base (7), and the straight plate face of another of floor (7) is connected with the broad side surface of the length direction of thrust plate (5).
4. a kind of device for measuring Compressor Set high pressure compressor for GH static frequency of blade according to claim 1 and 2, it is characterized in that: described vibration transducer (D) is current vortex sensor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210327182.4A CN102865915B (en) | 2012-09-06 | 2012-09-06 | Device for measuring static frequency of movable blade of high-pressure compressor of gas turbine combined compressor |
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|---|---|---|---|
| CN201210327182.4A CN102865915B (en) | 2012-09-06 | 2012-09-06 | Device for measuring static frequency of movable blade of high-pressure compressor of gas turbine combined compressor |
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| CN102865915B CN102865915B (en) | 2014-04-16 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103196644A (en) * | 2013-04-09 | 2013-07-10 | 中国航空动力机械研究所 | Testing device and testing method of integral-impeller blade vibration fatigue |
| CN108593230A (en) * | 2018-03-27 | 2018-09-28 | 西北工业大学 | A kind of Natural Frequency of Blade Auto-Test System |
| CN108931349A (en) * | 2018-04-09 | 2018-12-04 | 南京航空航天大学 | For simulating whirling test device in the hard object impact test of high speed |
| CN109708835A (en) * | 2019-02-21 | 2019-05-03 | 哈尔滨汽轮机厂有限责任公司 | A kind of steam turbine blade intrinsic frequency measurement excitation system |
| CN110220662A (en) * | 2019-07-23 | 2019-09-10 | 湖南南方通用航空发动机有限公司 | A kind of test method of blade high frequency static frequency |
| CN112504530A (en) * | 2020-11-17 | 2021-03-16 | 中国航发四川燃气涡轮研究院 | Method and system for testing excitation force of stator wake flow of gas compressor |
| CN113310695A (en) * | 2021-05-28 | 2021-08-27 | 中国商用飞机有限责任公司 | Aircraft engine windmill load ground simulation method and system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103196644A (en) * | 2013-04-09 | 2013-07-10 | 中国航空动力机械研究所 | Testing device and testing method of integral-impeller blade vibration fatigue |
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| CN108593230A (en) * | 2018-03-27 | 2018-09-28 | 西北工业大学 | A kind of Natural Frequency of Blade Auto-Test System |
| CN108931349A (en) * | 2018-04-09 | 2018-12-04 | 南京航空航天大学 | For simulating whirling test device in the hard object impact test of high speed |
| CN109708835A (en) * | 2019-02-21 | 2019-05-03 | 哈尔滨汽轮机厂有限责任公司 | A kind of steam turbine blade intrinsic frequency measurement excitation system |
| CN110220662A (en) * | 2019-07-23 | 2019-09-10 | 湖南南方通用航空发动机有限公司 | A kind of test method of blade high frequency static frequency |
| CN112504530A (en) * | 2020-11-17 | 2021-03-16 | 中国航发四川燃气涡轮研究院 | Method and system for testing excitation force of stator wake flow of gas compressor |
| CN113310695A (en) * | 2021-05-28 | 2021-08-27 | 中国商用飞机有限责任公司 | Aircraft engine windmill load ground simulation method and system |
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| CN102865915B (en) | 2014-04-16 |
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Effective date of registration: 20221226 Address after: 150000 building 3, high tech production base, Nangang District, Harbin City, Heilongjiang Province Patentee after: HARBIN TURBINE Co.,Ltd. Patentee after: HADIAN POWER EQUIPMENT NATIONAL ENGINEERING RESEARCH CENTER CO.,LTD. Address before: 150046 No. three power road 345, Xiangfang District, Heilongjiang, Harbin Patentee before: HARBIN TURBINE Co.,Ltd. |
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