CN109374145A - The method for determining component continuous temperature field based on discrete temperature measuring point - Google Patents
The method for determining component continuous temperature field based on discrete temperature measuring point Download PDFInfo
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- CN109374145A CN109374145A CN201811189974.3A CN201811189974A CN109374145A CN 109374145 A CN109374145 A CN 109374145A CN 201811189974 A CN201811189974 A CN 201811189974A CN 109374145 A CN109374145 A CN 109374145A
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- thermocouple
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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Abstract
The invention discloses the methods for determining component continuous temperature field based on discrete temperature measuring point, the component includes wall portion and transition junctions portion, the one transition junctions portion is connected with two wall portions, thermocouple tree is respectively set at the integrally connected of the transition junctions portion and the wall portion, thermocouple is set at the outer top in the transition junctions portion, the continuous temperature field in the transition junctions portion is determined based on the temperature data of the thermocouple tree and the thermocouple.The setting that the present invention passes through thermocouple tree and thermocouple, limited discrete measuring point, improve the precision of the continuous-stable field in determining transition junctions portion, and then it is conducive to obtain accurate complete non-linear continuously distributed temperature field on the section of complex component structure, conducive to fire-resistance fining research, the analysis to component.
Description
Technical field
The present invention relates to building element temperature field measurement fields in fire test, and in particular to true based on discrete temperature measuring point
Determine the method for component continuous temperature field.
Background technique
The accident of the initiation that takes place frequently of building structure fire causes huge loss to society and country in recent years, seriously endangers
To the person and property safety, in order to study failure mechanism and structural response situation of the building structure under fire, numerous scholars couple
A large amount of fire tests have been done in building structure.
In fire test, the internal temperature field for the component studied is the basis of failure mechanism and structural response research.
The measurement in temperature field is typically employed in the mode of the pre-buried thermocouple tree of inside configuration, the thermocouple for the single component of rule
Arrangement generally using uniformly distributed by the way of, each thermocouple tree it is interior along structural thickness direction it is discrete arrange several K-type thermocouples with
For temperature collection data, in temperature field analysis using the collected data of K-type thermocouple as the temperature field in the region.Pass through
Temperature field in component embedded set thermocouple tree, acquisition member, obtained data are all temperature fields discrete in structure, and
Temperature field in practical structures is all non-LINEAR CONTINUOUS distribution.This discrete temperature field data is analyzing single component such as:
When floor, beam, column, available accurate analysis is as a result, this is all confirmed in a large amount of test.
However, novel labyrinth applications more and more at present are in practice, such as prefabricated pipe gallery, prefabricated immersed tube
The structure types such as tunnel.These labyrinths are in experimental research under fire, and discrete temperature collection field field data can not be accurate
Reaction structure inside complete thermo parameters method situation.In this configuration, the arrangement quantity and arrangement form of thermocouple tree
And position has a great impact for the analysis precision in fire flowering structure temperature field, because this structure is complicated space knot
Structure, section form complexity have more transition junctions portion, and the temperature field at these transition junctions portions is difficult to through other regions
Measuring point temperature data is equivalent, therefore, it is necessary to be improved the deficiency.
Summary of the invention
To overcome deficiencies of the prior art, the present invention provides one kind and determines that component connects based on discrete temperature measuring point
The method in continuous temperature field can or improve the analysis precision of continuous temperature field at transition junctions portion at least to a certain extent.
The invention is realized by the following technical scheme: the method for determining component continuous temperature field based on discrete temperature measuring point, the structure
Part includes wall portion and transition junctions portion, and a transition junctions portion is connected with two wall portions, in the transition junctions portion
Thermocouple tree is respectively set at the integrally connected of the wall portion, thermocouple is set at the outer top in the transition junctions portion,
The continuous temperature field in the transition junctions portion is determined based on the temperature data of the thermocouple tree and the thermocouple.
Preferably, the thermocouple tree is arranged along the thickness direction of the wall portion, and the thermocouple tree includes multiple along institute
State the thermocouple tree length direction successively spaced thermocouple.
Preferably, subregion is carried out to the wall portion, to form wall portion unit, in the wall portion unit along the wall portion thickness
Thermocouple tree is respectively set at the opposite side in direction, the continuous temperature of the wall portion is determined based on the temperature data of the thermocouple tree
?.
Preferably, the transition junctions portion is in quadrangle along the section of the wall portion thickness direction.
Preferably, the wall portion unit is in quadrangle along the section of the wall portion thickness direction.
Preferably, the component is the prefabricated component of pipe gallery or immersed tube tunnel.
Preferably, the temperature data is handled by interpolation method and Matlab software.
The present invention improves determining transition junctions portion by the setting of thermocouple tree and thermocouple, limited discrete measuring point
Continuous-stable field precision, and then be conducive to obtain on the section of complex component structure accurate complete non-linear continuously distributed temperature
Field is spent, conducive to fire-resistance fining research, the analysis to component.
Detailed description of the invention
Invention is further described in detail in the following with reference to the drawings and specific embodiments.
Fig. 1 is the structural schematic diagram of component used in the embodiment of the present invention, fire source；
Fig. 2 is that the structural schematic diagram after thermocouple tree, thermocouple is arranged on the component of Fig. 1；
Fig. 3 is the structural schematic diagram of the thermocouple tree in Fig. 2；
Fig. 4 is the structural schematic diagram of the wall portion unit of roof in Fig. 2；
Fig. 5 is the structural schematic diagram of the wall portion unit of side wall in Fig. 2；
Fig. 6 is the structural schematic diagram of turnover interconnecting piece in Fig. 2；
Fig. 7 is the flow diagram being programmed using Matlab.
Corresponding as follows, the component 1 of each label, fire source 2, thermocouple tree 3, thermocouple 4, the wall portion unit 11 of roof turn in figure
Roll over interconnecting piece 12, the wall portion unit 13 of side wall.
Specific embodiment
The present invention is further described With reference to embodiment:
As an example, the side of component continuous temperature field is determined in the present embodiment fire test based on discrete temperature measuring point
Method, specifically includes the following steps:
1) thermocouple tree is arranged
As shown in Figures 1 to 3, the component 1 of the present embodiment is by taking the prefabricated component of single cabin pipe gallery as an example, certainly other one
In a little embodiments or the prefabricated component mode of immersed tube tunnel is implemented.
Specifically, the concrete structure section of component 1 and fire source 2 are as shown in Figure 1.The arrangement of temperature acquisition measuring point such as Fig. 2
Shown, the present embodiment in four outer corner points of component 1 except being arranged with individually in addition to the pre-buried thermocouple tree 3 in the inside of component 1
K-type thermocouple 4, to acquire the temperature data of special area, the arrangement principle of temperature acquisition measuring point is: by fiery homogeneous area,
Thermocouple tree acquisition measuring point is evenly arranged；In temperature gradient large area, focus measurement.
When it is implemented, for the section of complicated 1 structure of component, in the case where measuring point limited amount, the position of measuring point
It is critically important to set selection.In a fire, the temperature field of the intermediate region of the wall portion (such as roof, bottom wall and side wall) of component 1 is more equal
It is even, it is evenly arranged measuring point in these regions, measuring point spacing is advisable with 0.5-1m；In 12 (the i.e. corner regions of transition junctions portion of component 1
Domain), medial surface fire area region is small, and lateral surface heat dissipation area is big, while concrete material thermal inertia is very strong, heat transfer
Very slow, so temperature is lower in corner area, temperature gradient is larger, it is difficult to the temperature of angular position is calculated by other measuring points
Field is spent, angular position should arrange measuring point, carry out focus measurement to corner area.It is farthest apart from fire source 2 at the outer dead centre of corner, with
The surface temperature difference of other positions is larger.
2) thermocouple tree temperature curve is fitted
As shown in Fig. 2, the consistency of thickness of the length of thermocouple tree wall portion corresponding with component 1, to measure through-thickness
Thermo parameters method.As shown in figure 3, the discrete distribution of K-type thermocouple 4 pre-buried in thermocouple tree 3 is wherein, between K-type thermocouple 4
Away from generally 1cm-3cm.
Tradition is in floor fire test, when analyzing temperature field data, is carried out according to the point position of thermocouple to floor
Layering, it is believed that every layer of temperature field is consistent, and such as every 2cm is with a thickness of one layer, then it is assumed that the temperature field of 2cm thickness is consistent
, or linear interpolation is carried out to the region among two neighboring thermocouple measuring point and obtains the temperature data at no measuring point.But it is real
In the fire test of border, Temperature Distribution shows the non-linear of height along 1 thickness direction of component, and top and bottom process and linear interpolation method are true
It is all not accurate enough to determine temperature.The Temperature Distribution of more accurate through-thickness in order to obtain, the present embodiment will collect
Temperature data, with each thermocouple tree for one group, use more reasonable non-linear interpolation method processing, as Newton interpolating method,
Lagrange's interpolation, integrated method, spline method etc..Since the concrete thermal coefficient of various types and grade exists
Different, while there is also certain influences to thermal coefficient for temperature, so which kind of specifically used interpolation method can foundation
The concrete analysis of thermocouple tree measuring point data, and verify, select the preferable interpolation method that coincide with measuring point data.
3) to the section subregion of component 1
The thermo parameters method of component 1 is not uniform in fire, is concentrating by fiery regional temperature field often higher, the scene of a fire
Edge area temperature field is often lower, and in order to more reasonably analyze temperature field, the meter of zone temperature field is carried out to the section of structure
Point counting analysis.As shown in Fig. 2, the present embodiment arranges a K-type thermocouple 4 respectively in the apex of each corner of component 1 to measure
Surface temperature；Thermocouple tree 3 is respectively arranged at the integrally connected of transition junctions portion 12 and wall portion；Subregion is carried out to wall portion, such as
The wall portion unit 11 that subregion forms roof is carried out to roof, is equipped with thermocouple at the opposite side of 11 thickness direction of wall portion unit
Tree carries out the wall portion unit 13 that subregion forms side wall to side wall, also is provided with heat at the opposite side of 13 thickness direction of wall portion unit
Galvanic couple tree, bottom wall, which can be admitted to, to be stated the mode of roof and implements.
The method carries out subregion to 1 section of component using thermocouple tree measuring point as boundary.The corner area in 1 section of component is temperature
Degree gradient is big, boundary condition is more complicated, needs to pay close attention to, is individually divided into a region.The length and structure of thermocouple tree
The consistency of thickness of the corresponding wall portion of part 1 carries out subregion, all segmented areas to 1 section of component using thermocouple tree measuring point as boundary
It is all quadrangle.
Above-mentioned all subregions can be to be divided into two classes: opposite side is the subregion on thermocouple tree boundary and to face side be thermocouple tree
The subregion on boundary.
4) zone temperature field interpolation
More accurate thermo parameters method data in order to obtain, the method are adopted for the thermo parameters method feature of different subregions
With different interpolation methods.The characteristics of according to temperature in fire field, the section subregion of component 1 can be divided into three kinds of situations: 1. roofs
With the longitudinal thermocouple tree boundary of bottom wall area two subregion；2. the lateral thermocouple tree of side wall two boundary subregion；3. corner area two faces
Side thermocouple tree boundary subregion.Corresponding interpolation method is also classified into three kinds:
The temperature data of 4.1 two thermocouple tree position through-thickness has passed through fitting and has obtained, and tries in practical fire
During testing, temperature is mainly to change greatly on through-thickness, the temperature change and little on same thickness, so in subregion
Linear interpolation, such as Fig. 4 are carried out when interpolated value using the temperature on two thermocouple tree boundaries on same thickness as benchmark.
The abscissa on boundary one is x1Temperature variation curve on t moment through-thickness are as follows:
f1(x1, y, t) and=T1
The abscissa on boundary two is x2Temperature variation curve on t moment through-thickness are as follows:
f2(x2, y, t) and=T2
Any point A (the x in the subregion0,y0) in the temperature T of t moment0It can be obtained by interpolation, in same thickness position
y0The boundary temperature at place is respectively that B point temperature is f1(x1,y0, t) and C point temperature be f2(x2,y0, t):
4.2 sidewall areas, two horizontal boundary subregion is similar with the partitioning scenario of roof and bottom wall, two thermocouple tree positions
The temperature field of through-thickness has passed through fitting and has obtained, and during practical fire test, temperature is mainly through-thickness
On change greatly, the temperature change and little on same thickness, so in subregion interpolated value with two thermocouples on same thickness
The temperature for setting boundary carries out linear interpolation, such as Fig. 5 as benchmark.
The abscissa on boundary one is y1Temperature variation curve on t moment through-thickness are as follows:
g1(x,y1, t) and=T1
The abscissa on boundary two is y2Temperature variation curve on t moment through-thickness are as follows:
g2(x,y2, t) and=T2
Any point A (the x in the subregion0,y0) in the temperature T of t moment0It can be obtained by interpolation, in same thickness position
y0The boundary temperature at place is respectively that B point temperature is g1(x0,y1, t) and C point temperature be g2(x0,y2, t):
4.3 corner areas two face in subregion the temperature number as shown in fig. 6, thermocouple tree measurement when mainly facing by two
According to and apex a temperature data points carry out interpolation solve inside temperature field.Corner area is the equal of facing side from two to inhale
Heat is received, in addition two face side and distribute heat, and the temperature field of arbitrary point is more to face side by two to control in the region, so interpolation
Boundary is selected as two temperature fields for facing side, and interpolation datum mark was the interpolation point work straight line parallel with diagonal line and the friendship for facing side
Point carries out linear interpolation as the datum mark of interpolation, as shown in Figure 6.In order to facilitate expression, local coordinate is used in corner subregion
System, the region are two regions by diagonal division, can be indicated with mathematic(al) representation are as follows:
4.3.1 border region is faced for thermocouple two:
Two, which face side interpolation, acquires temperature change:
h1(0, y, t)=T1
h2(x, 0, t)=T2
Appoint in the area and takes a point A (x3,y3) cross the point make the straight line parallel with diagonal line and two face side intersection point difference
For B, C, the coordinate of two o'clock can be calculated by method of geometry:
B coordinate are as follows:Brief note are as follows: (x4,y4)
C coordinate are as follows:Brief note are as follows: (x5,y5)
The temperature of A point is calculated on the basis of B, C two o'clock by the method for linear interpolation:
4.3.2 border region is faced for heat dissipation two:
Two, which face side interpolation, acquires temperature change:
j1(x, H, t)=T1
j2(L, y, t)=T2
Appoint in the area and takes a point D (x8,y8) cross the point make the straight line parallel with diagonal line and two face side intersection point difference
For E, F, the coordinate of two o'clock can be calculated by method of geometry:
E coordinate are as follows:Brief note are as follows: (x6,y6)
F coordinate are as follows:Brief note are as follows: (x7,y7)
The temperature of D point is calculated on the basis of E, F two o'clock by linear interpolation method:
The temperature field in each region in 1 section of component can be passed through into thermocouple measuring point and interpolation side by above step
The temperature data of arbitrary point is calculated in method.
5) Matlab Analysis of programming temperature field
The mathematic(al) representation in step 4) is written as calculation procedure by the temperature data measured using Matlab
Whole cross section temperature field may be implemented quickly calculates and generates visual image, and convenient for analysis, programming process is as shown in Figure 7.
Arbitrarily small region is all there are countless points for face, although interpolation method can in the hope of the temperature data of arbitrary point,
In practical applications, it is not necessary that calculate all the points temperature data, very large data can be generated like that, and exceed
Actual needs.Institute in programming, as unit of cm, carries out the solution of benchmark interpolation, if necessary to more accurate in this way
When position data, quadratic interpolation can be carried out on this basis.
The present embodiment, by optimizing point layout, is fitted in the case where limited thermocouple quantity using interpolation method
Thermocouple tree (i.e. along component thickness direction) temperature variation curve, subregion interpolation calculation go out the continuously distributed temperature in each region
, total section continuously distributed temperature field under fire is restored finally by conversion coordinate system, can also be used
Matlab software programs analytic process and realizes fast calculation analysis, reduces the workload that manpower calculates.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Illustrative description is carried out to the invention patent above, it is clear that the realization of the invention patent is not by aforesaid way
Limitation, as long as use the invention patent method concept and technical solution carry out various improvement, or it is not improved will this
The conception and technical scheme of patent of invention directly apply to other occasions, are within the scope of the invention.
Claims (7)
1. based on the method that discrete temperature measuring point determines component continuous temperature field, the component includes wall portion and transition junctions
Portion, a transition junctions portion are connected with two wall portions, which is characterized in that in the transition junctions portion and the wall portion
Integrally connected at thermocouple tree is respectively set, at the outer top in the transition junctions portion be arranged thermocouple, be based on the heat
The temperature data of galvanic couple tree and the thermocouple determines the continuous temperature field in the transition junctions portion.
2. the method according to claim 1, wherein the thermocouple tree sets along the thickness direction of the wall portion
It sets, the thermocouple tree includes multiple along the thermocouple tree length direction successively spaced thermocouple.
3. the method according to claim 1, wherein to the wall portion carry out subregion, to form wall portion unit,
Thermocouple tree is respectively set along the opposite side of the wall portion thickness direction in the wall portion unit, the temperature based on the thermocouple tree
Data determine the continuous temperature field of the wall portion.
4. the method according to claim 1, wherein the transition junctions portion cutting along the wall portion thickness direction
Face is in quadrangle.
5. according to the method described in claim 3, it is characterized in that, the wall portion unit is along the section of the wall portion thickness direction
In quadrangle.
6. the method according to claim 1, wherein the component is the prefabricated of pipe gallery or immersed tube tunnel
Part.
7. the method according to claim 1, wherein the temperature data is soft by interpolation method and Matlab
Part processing.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110686522A (en) * | 2019-09-26 | 2020-01-14 | 北京国电龙源环保工程有限公司 | Hearth section temperature field construction method based on limited temperature measuring points |
| CN111342370A (en) * | 2020-04-15 | 2020-06-26 | 武长银 | Heat dissipation system of power distribution cabinet and control method thereof |
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| US20170199085A1 (en) * | 2016-01-13 | 2017-07-13 | Daily Instruments D/B/A Daily Thermetrics Corp. | Temperature Sensing Assembly for Measuring Temperature of a Wall of a High Temperature Vessel |
| CN106969933A (en) * | 2017-05-05 | 2017-07-21 | 华侨大学 | The mechanism for testing that immersed tube tunnel is deformed when a kind of unilateral passage catches fire |
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| US20020126730A1 (en) * | 2001-01-18 | 2002-09-12 | Jiangang Sun | Thermal imaging measurement of lateral diffusivity and non-invasive material defect detection |
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| CN111342370A (en) * | 2020-04-15 | 2020-06-26 | 武长银 | Heat dissipation system of power distribution cabinet and control method thereof |
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Application publication date: 20190222 |