CN105466495A - Method for measuring nonuniform temperature field in wall and wall thickness - Google Patents
Method for measuring nonuniform temperature field in wall and wall thickness Download PDFInfo
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- CN105466495A CN105466495A CN201511015908.0A CN201511015908A CN105466495A CN 105466495 A CN105466495 A CN 105466495A CN 201511015908 A CN201511015908 A CN 201511015908A CN 105466495 A CN105466495 A CN 105466495A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
Abstract
The invention discloses a method for measuring a nonuniform temperature field in a wall and the wall thickness, and the method comprises the steps: phase differences separately measured by using an ultrasonic longitudinal wave method and an ultrasonic transversal wave method are obtained, the phase differences are used as the input quantity, the equivalent thermal boundary condition and wall thickness are obtained based on a multiparameter inversion method of the inverse heat conduction problem, and the temperature field distribution states of the furnace wall or tube wall in different times are obtained according to the direct heat conduction problem. The method can be used for measuring the nonuniform temperature field in structures such as a blast furnace wall, a high-temperature steam pipeline wall and the like under a wall thickness unknown condition.
Description
Technical field
The present invention relates to ultrasonic detecting technology field, especially a kind of measuring method simultaneously obtaining pars intramuralis non-uniform temperature field and wall thickness.
Background technology
Ultrasonic solid thermometric is that a kind of correlativity based on ultrasonic propagation velocity and medium temperature realizes the thermometry that media interior temperature can't harm detected with high accuracy.Compare the temp measuring method of the pre-buried temperature sensor of traditional punching, ultrasonic temperature measurement method has the advantages such as harmless, contactless, fast response time; And compared with the methods such as, phosphorescence infrared with harmless, ultrasonic temperature measurement method effectively can measure the advantage of inside configuration temperature parameter.
The wall thickness of blast furnace furnace wall and high temperature steam pipeline tube wall etc. is owing to manufacturing the impact of the factor such as machining precision, burn into thermal expansion, and size is normally unknown accurately for it.Only adopt ultrasonic longitudinal wave or ultrasonic shear waves method separately, ultrasonic solid temp measuring method is difficult to the needs meeting engineering reality.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of measuring method simultaneously obtaining pars intramuralis non-uniform temperature field and wall thickness is proposed, be applicable to the measurement that heat conduction in wall can be approximately the inside configuration temperature parameter of Heat Conduction, infrared method large area first can be adopted to obtain the wall surface temperature of suspicious points or keypoint part, then adopt method of the present invention to carry out meticulous measurement.
In order to realize foregoing invention object, the invention provides following technical scheme: a kind of measuring method simultaneously obtaining pars intramuralis non-uniform temperature field and wall thickness, comprises the following steps:
(1), based on ultrasonic pulse-echo method, adopt normal beam technique and shear wave technique respectively, the phase differential of compressional wave between the reception echo of successively acquisition transmitted wave and measured target reflection
with the phase differential of shear wave
;
(2), according to the relation of ultrasound wave travel-time and phase place in wall, obtain adopting compressional wave and shear wave technique to measure equation along temperature field, wall thickness direction respectively by thermoacoustics theory, for:
①
②
Wherein,
for ultrasound wave transmission frequency;
for the distance of ultrasound wave one way propagation in wall;
for longitudinal wave velocity,
for transverse wave velocity;
(3), based on least-squares estimation, the objective function of reconstruction of temperature field is:
③
Wherein,
for the thermal boundary condition of equivalence;
for sampling number;
,
the phase differential that normal beam technique detected and calculated gained respectively;
,
the phase differential that shear wave technique detected and calculated gained respectively;
,
the weighting coefficient of compressional wave and shear wave residual sum respectively;
for being worth most;
(4) the inverse problem calculation, based on One-dimensional heat transfer obtains equivalent thermal boundary condition
and wall thickness
;
(5), solve according to heat conducting direct problem and obtain the inner not thermo parameters method state in the same time of furnace wall or tube wall
, wherein
for the different moment,
for the position in wall thickness direction.
Compared with prior art, the present invention has the following advantages: 1, can measure inside configuration non-uniform temperature field and the wall thickness such as blast furnace furnace wall and high temperature steam pipeline tube wall simultaneously, make wall thickness be no longer required precognition amount, greatly widen the scope of application of ultrasonic solid thermometry.
2, owing to using ultrasonic longitudinal wave and shear wave technique to measure respectively time, eliminate the impact of wall thickness unknown condition on ultrasonic temperature measurement precision, this makes this method effectively prevent and manufactures the factor such as machining precision, burn into thermal expansion to the interference of measuring.
Accompanying drawing explanation
Fig. 1 is the measurement procedure figure that the present invention obtains pars intramuralis non-uniform temperature field and wall thickness simultaneously;
Fig. 2 is the relation of compressional wave/transverse wave speed and temperature in the Q235 steel of rating test acquisition;
Fig. 3 is the measured result adopting ultrasonic method detection steel test specimen internal temperature field.
Embodiment
Describe the present invention below in conjunction with accompanying drawing, the description of this part is only exemplary and explanatory, should not have any restriction to protection scope of the present invention.
A kind of measuring method simultaneously obtaining pars intramuralis non-uniform temperature field and wall thickness as shown in Figure 1, basic step is:
(1) relation of compressional wave/transverse wave speed and temperature in detected test specimen (Q235 steel) is obtained by rating test, as shown in Figure 2;
(2) for steel test specimen (length × wide × height is 200 × 50 × 30mm, and the thickness adopting vernier caliper actual measurement hot face direction is 30.21mm), the temperature adopting infrared method large area to obtain 10s, 20s, 50s and 100s moment surface of test piece is respectively 26
, 26.3
, 38.7
with 62.3
;
(3) based on ultrasonic pulse-echo method, normal beam technique and shear wave technique is adopted respectively, the phase differential of compressional wave between the reception echo of successively acquisition transmitted wave and measured target reflection
with the phase differential of shear wave
;
(4) Multi-parameters conversion of heat conduction inverse problem is adopted to calculate the thermal boundary condition obtaining equivalence
and wall thickness
.The thickness prediction obtained by inverting is 29.93mm, is 0.93% with the error of actual measurement thickness.
(5) solve according to heat conducting direct problem and obtain the inner not thermo parameters method state in the same time of furnace wall or tube wall, as shown in Figure 3, the thickness in the tested direction of test specimen is 30.21mm, arranges a thermopair (except hot face), totally 5 along tested direction every 5mm.Diagram give 10s, 20s, 50s and 100s not in the same time thermocouple temperature measurement the data obtained contrast with the temperature data predicted based on the present invention.Shown in Fig. 3, result shows, the distribution of the inner non-uniform temperature field of the method energy predict steel test specimen.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (1)
1. obtain a measuring method for pars intramuralis non-uniform temperature field and wall thickness simultaneously, comprise the following steps:
(1), based on ultrasonic pulse-echo method, adopt normal beam technique and shear wave technique respectively, the phase differential of compressional wave between the reception echo of successively acquisition transmitted wave and measured target reflection
with the phase differential of shear wave
;
(2), according to the relation of ultrasound wave travel-time and phase place in wall, obtain adopting compressional wave and shear wave technique to measure equation along temperature field, wall thickness direction respectively by thermoacoustics theory, for:
①
②
Wherein,
for ultrasound wave transmission frequency;
for the distance of ultrasound wave one way propagation in wall;
for longitudinal wave velocity,
for transverse wave velocity;
(3), based on least-squares estimation, the objective function of reconstruction of temperature field is:
③
Wherein,
for the thermal boundary condition of equivalence;
for sampling number;
,
the phase differential that normal beam technique detected and calculated gained respectively;
,
the phase differential that shear wave technique detected and calculated gained respectively;
,
the weighting coefficient of compressional wave and shear wave residual sum respectively;
for being worth most;
(4) the inverse problem calculation, based on One-dimensional heat transfer obtains equivalent thermal boundary condition
and wall thickness
;
(5), solve according to heat conducting direct problem and obtain the inner not thermo parameters method state in the same time of furnace wall or tube wall
, wherein
for the different moment,
for the position in wall thickness direction.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511015908.0A CN105466495B (en) | 2015-12-31 | 2015-12-31 | Measuring method that is a kind of while obtaining pars intramuralis non-uniform temperature field and wall thickness |
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|---|---|---|---|
| CN201511015908.0A CN105466495B (en) | 2015-12-31 | 2015-12-31 | Measuring method that is a kind of while obtaining pars intramuralis non-uniform temperature field and wall thickness |
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| CN105466495A true CN105466495A (en) | 2016-04-06 |
| CN105466495B CN105466495B (en) | 2018-04-10 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109506807A (en) * | 2018-11-26 | 2019-03-22 | 中国空气动力研究与发展中心计算空气动力研究所 | Thermal structure internal temperature and wall thickness under a kind of limit measurement method simultaneously |
| CN109506806A (en) * | 2018-11-26 | 2019-03-22 | 中国空气动力研究与发展中心计算空气动力研究所 | Thermal structure internal temperature and measurement method while thickness under a kind of transient condition |
| CN111761408A (en) * | 2020-07-07 | 2020-10-13 | 哈尔滨理工大学 | Device and method for detecting internal and external temperature fields of cutter in milling process of quenched steel die |
| CN114674257A (en) * | 2022-03-31 | 2022-06-28 | 中国空气动力研究与发展中心计算空气动力研究所 | High-precision thickness measuring method and device based on ultrasonic transverse wave detection |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109506807A (en) * | 2018-11-26 | 2019-03-22 | 中国空气动力研究与发展中心计算空气动力研究所 | Thermal structure internal temperature and wall thickness under a kind of limit measurement method simultaneously |
| CN109506806A (en) * | 2018-11-26 | 2019-03-22 | 中国空气动力研究与发展中心计算空气动力研究所 | Thermal structure internal temperature and measurement method while thickness under a kind of transient condition |
| CN111761408A (en) * | 2020-07-07 | 2020-10-13 | 哈尔滨理工大学 | Device and method for detecting internal and external temperature fields of cutter in milling process of quenched steel die |
| CN111761408B (en) * | 2020-07-07 | 2021-06-18 | 哈尔滨理工大学 | Detection method of detection device for internal and external temperature fields of cutter in milling process of quenched steel die |
| CN114674257A (en) * | 2022-03-31 | 2022-06-28 | 中国空气动力研究与发展中心计算空气动力研究所 | High-precision thickness measuring method and device based on ultrasonic transverse wave detection |
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| CN105466495B (en) | 2018-04-10 |
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