CN102183583A - Method for measuring axial sound velocity of in-use glass steel threaded pull rod in situ by utilizing echo - Google Patents
Method for measuring axial sound velocity of in-use glass steel threaded pull rod in situ by utilizing echo Download PDFInfo
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- CN102183583A CN102183583A CN 201110031188 CN201110031188A CN102183583A CN 102183583 A CN102183583 A CN 102183583A CN 201110031188 CN201110031188 CN 201110031188 CN 201110031188 A CN201110031188 A CN 201110031188A CN 102183583 A CN102183583 A CN 102183583A
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- pull rod
- sound velocity
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- sound
- glass steel
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Abstract
The invention discloses a method for measuring axial sound velocity of an in-use glass steel threaded pull rod in situ by utilizing echo and relates to a method for measuring sound velocity of a glass steel threaded pull rod. The method comprises the following steps of: (1) measuring screw pitch d between two adjacent threads on the glass steel threaded pull rod by using a vernier caliper; (2) inputting initial sound velocity C0 randomly to an ultrasonic flaw detector; (3) coupling and fixing a probe of the ultrasonic flaw detector to the end face of the glass steel threaded pull rod; (4) calculating distance d0 between two adjacent threaded waves by substracting soundpath 1 from soundpath 2; and (5) calculating the axial sound velocity CX of the glass steel threaded pull rod, wherein CX is equal to C0(d/d0). The method is simple and practical and is accurate in measurement. By the method, in-situ and on-line measurement is realized and efficiency is high. The method is applicable to measurement on the axial sound velocity of the in-use glass steel threaded pull rod. By the method, the technical problem that the axial sound velocity of an ultralong threaded pull rod cannot be measured by the conventional sound velocity measuring method is solved.
Description
Technical field
The present invention relates to a kind of fiberglass thread sonic velocity measurement method, relate in particular to a kind of echo in-site measurement that utilizes in method with the axial velocity of sound of fiberglass thread.
Background technology
Fiberglass is a kind of owing to the material that becomes the factor affecting of grading that acoustical behavior is differed greatly.Though experimental sample has identical matrix resin and axial tensile strength with on-the-spot thread, can't determine whether with on-the-spot thread material identical.For can to the accurate location of on-the-spot thread Ultrasonic Detection with quantitatively, must study a kind of in the method for carrying out in-site measurement with the axial acoustical behavior of thread.
Conventional sonic velocity measurement method has two kinds:
First kind is most widely used, promptly utilize the pulse-echo echometric measurement velocity of sound, this method must have the bottom surface (or reflecting body) of a known sound path, utilizes once and measures the velocity of sound with the survey velocity of sound function of secondary Bottom echo (or reflecting body echo) passing ratio relation or instrument;
Second kind is to measure ultrasound wave to measure the velocity of sound by the time of known length.
With valve tower pull bar total length 4.5m, prove that through lab investigation 2# ordinary ultrasonic probe and #5 phased array probe (table 1) all can't observe the Bottom echo that length is the 1.5m pull bar.
Therefore, above-mentioned two kinds of methods of the measurement velocity of sound are all inapplicable.
Summary of the invention
Purpose of the present invention just is to overcome the shortcoming and defect that prior art exists, by the design feature of research thread self and the ultimate principle of acoustic velocity measutement, the method of the acoustic velocity measutement of comprehensive two kinds of routines provides a kind of echo in-site measurement that utilizes in the method with the axial velocity of sound of fiberglass thread.
The object of the present invention is achieved like this, and promptly this method comprises the following steps:
1. use the pitch d between the two adjacent screw threads on the vernier caliper measurement fiberglass thread, average after many surveys several times;
2. import an initial velocity of sound C arbitrarily to ultra-sonic defect detector
0
3. the probe coupling of ultra-sonic defect detector is fixed in the end face of fiberglass thread, mobile probe is regulated gain, observes screw thread ripple clearly on the oscillography screen of ultra-sonic defect detector;
4. block 1 screw thread ripple with gate, read its sound path 1;
Mobile again gate blocks adjacent screw thread ripple, reads its sound path 2;
Calculate the spacing d of per two adjacent thread ripples
0=sound path 2-sound path 1;
Average after many surveys several times;
5. calculate the axial velocity of sound of fiberglass thread: C
X=C
0(d/d
0).
Principle of work of the present invention is: utilize the sound time difference that the ultra-sonic defect detector oscillography is shielded between the adjacent two screw thread ripples to equate by the real time of two adjacent threads on sample with ultrasound wave, by equation C
X=C
0(d/d
0) calculate the axial velocity of sound of fiberglass thread.
The present invention has following advantage and good effect:
1, method is simple and practical, measures accurately;
2, scene and on-line measurement have been realized, the efficient height;
3, be applicable to that measurement with the axial velocity of sound of fiberglass thread, has solved the difficult scientific problems that conventional sonic velocity measurement method can't be measured the axial velocity of sound of overlength thread.
Description of drawings
Fig. 1 is the structural representation of this measurement mechanism, among the figure:
The 10-thread, 11-m screw thread, 12-m+1 screw thread;
The 20-ultra-sonic defect detector, 21-probe, 22-oscillography screen;
The 30-vernier caliper.
Fig. 2 surveys pull bar velocity of sound figure according to ultrasonic screw thread echo,
Horizontal ordinate is a distance, and ordinate is a wave amplitude.
Embodiment
Describe in detail below in conjunction with drawings and Examples:
One, measurement mechanism
As Fig. 1, workbench of the present invention is a measurement mechanism, comprises thread 10, ultra-sonic defect detector 20 and vernier caliper 30, and ultra-sonic defect detector 20 comprises probe 21 and oscillography screen 22, and probe 21 is fixed on the end face of thread 10.
Two, measuring method
As Fig. 1, this method comprises the following steps:
1. with the pitch d=3.9mm between m screw thread 11 and the m+1 screw thread 12 on the vernier caliper 30 measurement threads 10;
2. import an initial velocity of sound C arbitrarily to ultra-sonic defect detector 20
0=4000m/s;
3. probe 21 couplings of ultra-sonic defect detector 20 are fixed in the end face of thread 10, move and visit 21, regulate gain, on the oscillography screen 22 of ultra-sonic defect detector 20, observe screw thread ripple clearly;
4. block the screw thread ripple of m screw thread 11 with gate, read its sound path 1=36.0mm;
Mobile again gate blocks the screw thread ripple of m+1 screw thread 12, reads its sound path 2=39.0mm;
Calculate the spacing d of per two adjacent thread ripples
0=sound path 2-sound path 1=39.0mm-36.0mm=3.0mm;
5. calculate the axial velocity of sound of thread:
C
X＝C
0(d/d
0)＝4000m/s×(3.9mm/3.0mm)
＝5200m/s。
Three, actual measurement situation
1, test is with popping one's head in and parameter
Table 1
2, test findings
Screw thread wave space with #4 probe measurement sample is 3.9mm, as Fig. 2;
Use formula C
X=C
0(d/d
0) calculate the axial velocity of sound of sample, compare with the velocity of sound that records with conventional method, be shown in Table 2.
Table 2
By table as seen, with sound velocity error≤2% that this method records, in admissible scope, therefore utilizing ultrasonic screw thread echo scene to measure valve tower pull rod shaft is feasible to the method for the velocity of sound.
Claims (1)
1. one kind is utilized the echo in-site measurement in the method with the axial velocity of sound of fiberglass thread, comprises the measurement mechanism of being made up of thread (10), ultra-sonic defect detector (20) and vernier caliper (30), it is characterized in that:
1. use the pitch d between vernier caliper (30) measurement fiberglass thread (10) the last two adjacent screw threads, average after many surveys several times;
2. import an initial velocity of sound C arbitrarily to ultra-sonic defect detector (20)
0
3. probe (21) coupling of ultra-sonic defect detector (20) is fixed in the end face of fiberglass thread (10), mobile probe (21) is regulated gain, observes screw thread ripple clearly on the oscillography screen (22) of ultra-sonic defect detector (20);
4. block 1 screw thread ripple with gate, read its sound path 1;
Mobile again gate blocks adjacent screw thread ripple, reads its sound path 2;
Calculate the spacing d of per two adjacent thread ripples
0=sound path 2-sound path 1;
Average after many surveys several times;
5. calculate the axial velocity of sound of fiberglass thread: C
X=C
0(d/d
0).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110031188 CN102183583A (en) | 2011-01-27 | 2011-01-27 | Method for measuring axial sound velocity of in-use glass steel threaded pull rod in situ by utilizing echo |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110031188 CN102183583A (en) | 2011-01-27 | 2011-01-27 | Method for measuring axial sound velocity of in-use glass steel threaded pull rod in situ by utilizing echo |
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| CN102183583A true CN102183583A (en) | 2011-09-14 |
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| CN 201110031188 Pending CN102183583A (en) | 2011-01-27 | 2011-01-27 | Method for measuring axial sound velocity of in-use glass steel threaded pull rod in situ by utilizing echo |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931587A (en) * | 2015-06-23 | 2015-09-23 | 国电科学技术研究院 | Nickel-based alloy-bolt ultrasonic shear wave velocity measurement method for ultra-supercritical generator unit main throttle valves |
| CN104990983A (en) * | 2015-06-25 | 2015-10-21 | 国电科学技术研究院 | Method for measuring transverse wave sound velocity of bolt |
| CN107290431A (en) * | 2017-06-20 | 2017-10-24 | 中国石油化工股份有限公司 | A kind of fiberglass-reinforced glass storage tank time limit detection method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010266416A (en) * | 2009-05-18 | 2010-11-25 | Central Res Inst Of Electric Power Ind | Method of processing phased array aperture synthesis and method of evaluating application effect thereof |
-
2011
- 2011-01-27 CN CN 201110031188 patent/CN102183583A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010266416A (en) * | 2009-05-18 | 2010-11-25 | Central Res Inst Of Electric Power Ind | Method of processing phased array aperture synthesis and method of evaluating application effect thereof |
Non-Patent Citations (2)
| Title |
|---|
| 《压力容器》 20080229 杨勇等 火电站P91钢焊接接头超声检测方法的研究 , * |
| 《武汉大学学报》 20101231 李晓红等 换流阀阀塔玻璃钢拉杆的超声检测 , * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931587A (en) * | 2015-06-23 | 2015-09-23 | 国电科学技术研究院 | Nickel-based alloy-bolt ultrasonic shear wave velocity measurement method for ultra-supercritical generator unit main throttle valves |
| CN104990983A (en) * | 2015-06-25 | 2015-10-21 | 国电科学技术研究院 | Method for measuring transverse wave sound velocity of bolt |
| CN104990983B (en) * | 2015-06-25 | 2017-12-26 | 国电锅炉压力容器检验中心 | A kind of bolt transverse wave velocity measuring method |
| CN107290431A (en) * | 2017-06-20 | 2017-10-24 | 中国石油化工股份有限公司 | A kind of fiberglass-reinforced glass storage tank time limit detection method |
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Application publication date: 20110914 |