CN104019777A - Method for ultrasonic measurement of depth of crack on surface of turbine blade - Google Patents
Method for ultrasonic measurement of depth of crack on surface of turbine blade Download PDFInfo
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- CN104019777A CN104019777A CN201410264028.6A CN201410264028A CN104019777A CN 104019777 A CN104019777 A CN 104019777A CN 201410264028 A CN201410264028 A CN 201410264028A CN 104019777 A CN104019777 A CN 104019777A
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention provides a method for ultrasonic measurement of the depth of a crack on the surface of a turbine blade. The method comprises the steps that firstly, double surface wave probes including the receiving probe and the transmitting probe are arranged on the surface of the turbine blade in a spaced mode, if no crack exists on the surface of the turbine blade, after a surface wave passes through a blade interface which is in contact with air from the transmitting probe and then passes for a certain distance, the surface wave is received by the receiving probe, and a wave-path distance displayed on an oscilloscope is a constant; when a crack exists on the surface of the turbine blade, the wave-path distance of the surface wave is lengthened, the lengthening degree of the wave-path distance is changed along with the depth of the crack, and according to the lengthening degree of the wave-path distance displayed on the oscilloscope, the depth of the crack on the surface of the turbine blade can be measured. According to the method for ultrasonic measurement of the depth of the crack on the surface of the turbine blade, the double ultrasonic surface wave probes are used for measuring the depth of the crack on the surface of the turbine blade, measurement is not influenced by distribution of cracks, a complicated special measurement device is not needed, the method is easy to grasp, operation is easy and convenient, and compared with other methods, the measurement result is more accurate and reliable.
Description
Technical field
The present invention relates to the measuring method of the turbine blade cracks with surface openings degree of depth, be specifically related to a kind of ultrasonic measurement method of the turbine blade cracks with surface openings degree of depth.
Background technology
Crackle is that parts endanger one of maximum defect.In power industry some great high-speed rotating component as turbine blade bears the effect of moment of torsion and shock load under High Temperature High Pressure running environment, often can produce surface crack, and these surperficial crackles have more harmfulness than the defect of its inside.Therefore, need their degree of depth of Accurate Measurement, to determine that can these parts continue safe handling or how to repair.
The degree of depth method of measuring at present surface crack is more, as measured the potential method that causes potential change because of crackle, measures the stray field method that the loose stray field that forms because of crackle changes, and measures and causes the vortex induction method that oscillation frequency changes because of crackle.
Although these methods in some cases actively detect crack degree of depth are all proved effective to some extent, due to the complicated cause with needing special special measuring equipment of crack distribution, be difficult at the scene promote the use of.
Summary of the invention
The problem existing in order to solve above-mentioned prior art, the object of the present invention is to provide a kind of ultrasonic measurement method of the turbine blade cracks with surface openings degree of depth, utilize the variation of surface wave propagation time to determine crack depth, not affected by crack distribution, without the special measuring equipment of complexity, be easy to grasp, easy and simple to handle, measurement result is accurate compared with other method, reliable.
Measuring principle of the present invention is: take two surface wave probes and be placed on turbine blade surface with certain spacing, make transmitting probe for one, another makes receiving transducer, if turbine blade surface does not have crackle, surface wave receives from transmitting probe received probe after the certain distance at the blade interface that contacts with air, and the wave-path showing on instrument oscillograph is a definite value; In the time having an opening crackle to exist on blade surface, the wave-path distance of surface wave will extend, and the degree of its prolongation becomes with crack depth, and crackle is darker, and wave-path is just more apart from increasing, otherwise just fewer.
The present invention adopts following technical scheme:
A kind of ultrasonic measurement method of the turbine blade cracks with surface openings degree of depth, first two surface wave probes are placed on to flawless turbine blade surface with certain spacing, one of them surface wave probe is as transmitting probe I, another surface wave probe is as receiving transducer II, ultrasound wave from occur to reception the distance of process be L
1+ L
2, the reflection wave showing on oscillograph is R, the distance between reflection wave R and initial pulse T by ultrasound wave when the flawless of turbine blade surface from transmitting probe I through blade during to receiving transducer II the pure surface distance L of process
1+ L
2; Then fix the distance L between transmitting probe I and receiving transducer II
1+ L
2, and by the transmitting probe I fixing and receiving transducer II along the vertical direction of turbine blade cracks with surface openings across being put in crackle both sides, the reflection wave at this moment showing on oscillograph is R ＇, reflection wave R ＇ the distance of process be L
1+ L
2+ 2L
3; Can find out distance L corresponding to reflection wave R ＇ while there is crackle from wave form analysis figure
1+ L
2+ 2L
3distance L corresponding to reflection wave R while deducting flawless
1+ L
2, be crack depth L
32 times of values, can accurately measure like this crack depth L
3.
Brief description of the drawings
Fig. 1 is the device schematic diagram that the present invention utilizes the two probe measurement turbine blade cracks with surface openings degree of depth of surface wave.
Fig. 2 is the wave form analysis figure that the present invention utilizes the two probe measurement turbine blade cracks with surface openings degree of depth of surface wave.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
As shown in Figure 1, the measurement mechanism that the ultrasonic measurement method of a kind of turbine blade cracks with surface openings of the present invention degree of depth adopts, this measurement mechanism comprises two surface wave probes, one is transmitting probe I, another is receiving transducer II, distance between them is a fixed value, and these two surface wave probes are placed in respectively the both sides of the cracks with surface openings III of turbine blade IV.
As shown in Figure 2, the wave form analysis figure that the ultrasonic measurement method of a kind of turbine blade cracks with surface openings of the present invention degree of depth adopts, T is initial pulse, the reflection wave that when R is blade surface flawless, ripple shows at oscillograph to receiving transducer II from transmitting probe I, R ＇ is the blade surface reflection wave that ripple shows at oscillograph to receiving transducer II from transmitting probe I while there is crackle.
The concrete grammar that the present invention adopts the wave form analysis shown in measurement mechanism and Fig. 2 as shown in Figure 1 to carry out ultrasonic measurement to the turbine blade cracks with surface openings degree of depth is: first, take two surface wave probes and be placed on turbine blade surface with certain spacing, make transmitting probe I for one, another makes receiving transducer II, in the time of blade surface flawless, ultrasound wave from occur to reception the distance of process be L
1+ L
2, the reflection wave showing on oscillograph is R, the distance between reflection wave R and initial pulse T by ultrasound wave in the time that blade surface does not have crackle from probe I through blade when popping one's head in II the pure surface distance L of process
1+ L
2.Then fix the distance L between transmitting probe I and receiving transducer II
1+ L
2and by the transmitting probe I fixing and receiving transducer II along the vertical direction of turbine blade cracks with surface openings across being put in crackle both sides, turbine blade cracks with surface openings width is very little, negligible, at this moment the reflection wave showing on oscillograph is R ＇, reflection wave R ＇ the distance of process be L
1+ L
2+ 2L
3.Can find out distance L corresponding to reflection wave R ＇ while there is crackle from wave form analysis figure
1+ L
2+ 2L
3distance L corresponding to reflection wave R while deducting flawless
1+ L
2be crack depth L
32 times of values, can accurately measure like this crack depth L
3.
Claims (1)
1. the ultrasonic measurement method of a turbine blade cracks with surface openings degree of depth, it is characterized in that: first two surface wave probes are placed on to flawless turbine blade surface with certain spacing, one of them surface wave probe is as transmitting probe I, another surface wave probe is as receiving transducer II, ultrasound wave from occur to reception the distance of process be L
1+ L
2, the reflection wave showing on oscillograph is R, the distance between reflection wave R and initial pulse T by ultrasound wave when the flawless of turbine blade surface from transmitting probe I through blade during to receiving transducer II the pure surface distance L of process
1+ L
2; Then fix the distance L between transmitting probe I and receiving transducer II
1+ L
2, and by the transmitting probe I fixing and receiving transducer II along the vertical direction of turbine blade cracks with surface openings across being put in crackle both sides, the reflection wave at this moment showing on oscillograph is R ＇, reflection wave R ＇ the distance of process be L
1+ L
2+ 2L
3; Can find out distance L corresponding to reflection wave R ＇ while there is crackle from wave form analysis figure
1+ L
2+ 2L
3distance L corresponding to reflection wave R while deducting flawless
1+ L
2, be crack depth L
32 times of values, can accurately measure like this crack depth L
3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410264028.6A CN104019777A (en) | 2014-06-13 | 2014-06-13 | Method for ultrasonic measurement of depth of crack on surface of turbine blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410264028.6A CN104019777A (en) | 2014-06-13 | 2014-06-13 | Method for ultrasonic measurement of depth of crack on surface of turbine blade |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104019777A true CN104019777A (en) | 2014-09-03 |
Family
ID=51436661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410264028.6A Pending CN104019777A (en) | 2014-06-13 | 2014-06-13 | Method for ultrasonic measurement of depth of crack on surface of turbine blade |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104019777A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709218A (en) * | 2018-12-24 | 2019-05-03 | 陕西能源麟北发电有限公司 | A kind of turbine blade ultrasonic surface wave detecting method |
| CN109932428A (en) * | 2019-02-28 | 2019-06-25 | 天津大学 | For acquiring the removable dual probe piezoelectric transducer of surface acoustic wave signal |
| CN109946386A (en) * | 2019-02-28 | 2019-06-28 | 天津大学 | The method for obtaining print surface acoustic wave phase velocity using dual probe piezoelectric transducer |
| CN113108731A (en) * | 2021-05-28 | 2021-07-13 | 西安热工研究院有限公司 | Method for measuring edge thickness of workpiece by using ultrasonic surface wave |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2104219A (en) * | 1981-07-27 | 1983-03-02 | Hitachi Ltd | Measuring sizes by means of ultrasonic waves |
| JPH0194205A (en) * | 1987-10-06 | 1989-04-12 | Hitachi Constr Mach Co Ltd | Measurement of propagation distance of ultrasonic wave |
| JP2003106830A (en) * | 2001-09-28 | 2003-04-09 | Univ Tokyo | Method for measuring length in elastic material |
| CN101071124A (en) * | 2006-05-09 | 2007-11-14 | 同济大学 | Method for detecting concrete structure lean cracks using ultrasonic wave |
| CN101206195A (en) * | 2006-12-21 | 2008-06-25 | 上海宝钢工业检测公司 | Method for testing burial depth of approximate surface layer defect by ultrasound wave |
| CN103063742A (en) * | 2013-01-06 | 2013-04-24 | 沈阳黎明航空发动机(集团)有限责任公司 | Surface wave in-situ flaw detection method of rotor blade with coating |
-
2014
- 2014-06-13 CN CN201410264028.6A patent/CN104019777A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2104219A (en) * | 1981-07-27 | 1983-03-02 | Hitachi Ltd | Measuring sizes by means of ultrasonic waves |
| JPH0194205A (en) * | 1987-10-06 | 1989-04-12 | Hitachi Constr Mach Co Ltd | Measurement of propagation distance of ultrasonic wave |
| JP2003106830A (en) * | 2001-09-28 | 2003-04-09 | Univ Tokyo | Method for measuring length in elastic material |
| CN101071124A (en) * | 2006-05-09 | 2007-11-14 | 同济大学 | Method for detecting concrete structure lean cracks using ultrasonic wave |
| CN101206195A (en) * | 2006-12-21 | 2008-06-25 | 上海宝钢工业检测公司 | Method for testing burial depth of approximate surface layer defect by ultrasound wave |
| CN103063742A (en) * | 2013-01-06 | 2013-04-24 | 沈阳黎明航空发动机(集团)有限责任公司 | Surface wave in-situ flaw detection method of rotor blade with coating |
Non-Patent Citations (2)
| Title |
|---|
| 《超声波探伤》编写组: "《超声波探伤》", 30 November 1980, 电力工业出版社 * |
| 云庆华: "《锅炉、压力容器无损探伤技术》", 31 August 1985, 天津科学技术出版社 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709218A (en) * | 2018-12-24 | 2019-05-03 | 陕西能源麟北发电有限公司 | A kind of turbine blade ultrasonic surface wave detecting method |
| CN109932428A (en) * | 2019-02-28 | 2019-06-25 | 天津大学 | For acquiring the removable dual probe piezoelectric transducer of surface acoustic wave signal |
| CN109946386A (en) * | 2019-02-28 | 2019-06-28 | 天津大学 | The method for obtaining print surface acoustic wave phase velocity using dual probe piezoelectric transducer |
| CN109946386B (en) * | 2019-02-28 | 2021-08-06 | 天津大学 | Method for acquiring acoustic surface wave phase velocity of sample wafer by using dual-probe piezoelectric sensor |
| CN113108731A (en) * | 2021-05-28 | 2021-07-13 | 西安热工研究院有限公司 | Method for measuring edge thickness of workpiece by using ultrasonic surface wave |
| CN113108731B (en) * | 2021-05-28 | 2024-06-18 | 西安热工研究院有限公司 | Method for measuring edge thickness of workpiece by utilizing ultrasonic surface wave |
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Application publication date: 20140903 |
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