CN109297304B - A kind of alkali metal gas chamber non-uniform heating methods based on finite element analysis - Google Patents
A kind of alkali metal gas chamber non-uniform heating methods based on finite element analysis Download PDFInfo
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- CN109297304B CN109297304B CN201811093706.1A CN201811093706A CN109297304B CN 109297304 B CN109297304 B CN 109297304B CN 201811093706 A CN201811093706 A CN 201811093706A CN 109297304 B CN109297304 B CN 109297304B
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- heating
- alkali metal
- temperature
- gas chamber
- finite element
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B17/00—Furnaces of a kind not covered by any preceding group
- F27B17/0016—Chamber type furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D11/00—Arrangement of elements for electric heating in or on furnaces
- F27D11/02—Ohmic resistance heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0003—Monitoring the temperature or a characteristic of the charge and using it as a controlling value
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
- F27D2019/0034—Regulation through control of a heating quantity such as fuel, oxidant or intensity of current
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0096—Arrangements of controlling devices involving simulation means, e.g. of the treating or charging step
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The present invention relates to a kind of alkali metal gas chamber non-uniform heating methods based on finite element analysis, according to the asymmetrical feature of alkali metal gas chamber Roasting oven structure, the optimum heating temperature for being pasted on oven outer surface heating film is calculated using the method for finite element analysis, make alkali metal plenum interior thermo parameters method more evenly using the heating condition, to obtain atomicity Density Distribution more evenly.This method can greatly improve the uniformity of alkali metal plenum interior thermo parameters method in the case of atmospheric chamber multiposition measuring, to improve the uniformity of detection signal.Compared with thermal current heating means, this method can greatly improve heating efficiency；Compared with traditional Electric heating, the present invention can get the heating effect of thermo parameters method more evenly.The heating means can for atmospheric chamber, multiposition measuring atom magnetometer biomagnetic measurement field application reference is provided.
Description
Technical field
The present invention relates to a kind of alkali metal gas chamber non-uniform heating methods based on finite element analysis, can be used for atom magnetic strength
The heating of alkali metal gas chamber is counted, to obtain alkali metal gas chamber thermo parameters method more evenly.
Background technique
Alkali metal gas chamber is the important Sensitive Apparatus of atom magnetometer.Due to the atom number density point of alkali metal plenum interior
Cloth is directly related with temperature, and in the case of atmospheric chamber, the measurement of multidigit point, the uniformity of atomicity Density Distribution be will have a direct impact on
The quality of measuring signal is influenced to the uniformity of multidigit point magnetic field sensing signal.Thus it is guaranteed that under the premise of heating efficiency,
The uniformity of alkali metal gas chamber thermo parameters method is of great significance in raising atmospheric chamber, the measurement of multidigit point.
Alkali metal gas chamber is heated by the way of air-flow heating earliest, can effectively avoid using the heating method
Heating source and alkali metal gas chamber directly contact, it can be achieved that preferably without magnetic heating effect, and can get uniform alkali metal gas
Room temperature field distribution, disadvantage are that heating efficiency is low, and it also requires the external oven of a large volume generates thermal current not
Conducive to the miniaturization of atom magnetometer；Current atom magnetometer generally using the electrically heated mode of no magnetic come to alkali metal gas chamber into
Row heating the advantage is that heating efficiency height, its shortcoming is that the heating method of currently used multi-panel isothermal heating can be led
The uneven of alkali metal plenum interior heating temperature field distribution is caused, will have a direct impact on atmospheric chamber, multidigit point magnetic-field measurement letter
Number uniformity to influence the quality of transducing signal.
Summary of the invention
The technology of the present invention solves the problems, such as: in order to overcome the above-mentioned deficiencies of the prior art, providing a kind of based on finite element analysis
Alkali metal gas chamber non-uniform heating methods, alkali metal plenum interior temperature in the case of atmospheric chamber multiposition measuring can be greatly improved
The uniformity of field distribution, to improve the uniformity of detection signal.
The problem to be solved in the present invention is: brought under multi-disc heating film isothermal heating condition for the heating of no magnetoelectricity
Heat the non-uniform problem of plenum interior thermo parameters method, provide it is a kind of under the premise of guaranteeing alkali metal gas chamber high heating efficiency simultaneously
Obtain the heating means of the heating temperature field distribution inside it more evenly.
The technical scheme adopted by the invention is that: a kind of alkali metal gas chamber non-uniform heating side based on finite element analysis
Method is calculated respectively by the method for introducing finite element analysis according to the asymmetric feature of alkali metal gas chamber heating structure itself
The optimal heating temperature of heating film, and its optimum results is applied in practical heating process, to realize to alkali metal gas chamber
Optimization heating.The specific implementation steps are as follows:
(1) physical model of alkali metal gas chamber and its heating structure is constructed according to the heating structure of alkali metal gas chamber first；
Then constructed physical model is imported into finite element analysis software, according to alkali metal gas chamber and its heating structure material
The thermodynamic parameter of finite element analysis is arranged in performance parameter, to complete as composed by alkali metal gas chamber and its heating structure
The building of the finite element analysis model of heating system；
(2) based on finite element analysis model constructed by step (1), first fixed base metal air chamber outside heating structure is symmetrical
The heating temperature T of part heating surface1, change the heating temperature T in the asymmetric face of heating structure outside alkali metal gas chamber2, carry out limited
Meta analysis, and calculate in different T2At a temperature of alkali metal plenum interior Steady-State Thermal Field obtained coefficient of variation CV value；
With (T2-T1) it is abscissa, with (T2-T1) corresponding to CV value be ordinate carry out described point and carry out curve fitting, according to fitting tie
Fruit solves CV and obtains (T corresponding when minimum2-T1) temperature value, that is, obtain in T1At a temperature of optimum heating temperature
T2Value；
(3) T obtained according to step (2)1At a temperature of optimum heating temperature T2It is accurately controlled using feedback control principle viscous
It is attached to the heating temperature of heating film on the alkali metal gas chamber heating structure plane of symmetry and asymmetric face, to obtain in alkali metal gas chamber
The most uniform heating effect of portion's thermo parameters method.
The step (1) physical model passes through SolidWorks, ProE, Autodesk Inventor software building；
Heating system finite element analysis model is constructed by the completion of ANSYS, COMSOL, NASTRAN software.
In the step (2), the calculation formula of alkali metal plenum interior temperature field coefficient of variation CV is as follows:
Wherein f is the standard deviation of plenum interior thermo parameters method, TaverFor the mean temperature of plenum interior.
The calculation formula of the f is as follows:
Wherein T indicates to be located at the steady temperature value at coordinate points (x, y, z), and V indicates the volume of alkali metal gas chamber.
The mean temperature T of plenum interioraverCalculation formula it is as follows:
Taver=∫ ∫ ∫ Tdxdydz/V
Temperature used by the step (3) controls closed loop feedback system by temperature transducer, PID control circuit and power amplifier
Composition；The heating temperature that heating film is monitored by temperature transducer, is controlled according to temperature monitoring result by PID control electronic feedback
The output power of power amplifier is to realize the accurate control to heating film heating temperature.
The advantages of present invention is compared with existing heating technique is:
(1) present invention is calculated according to the asymmetrical feature of alkali metal gas chamber Roasting oven structure using the method for finite element analysis
It is pasted on the optimum heating temperature of oven outer surface heating film out, makes alkali metal plenum interior temperature field point using the heating condition
Cloth more evenly, to obtain atomicity Density Distribution more evenly.
(2) present invention can greatly improve the equal of alkali metal plenum interior thermo parameters method in the case of atmospheric chamber multiposition measuring
Even property, to improve the uniformity of detection signal.Compared with thermal current heating means, this method can greatly improve heating efficiency；
Compared with traditional Electric heating, this method can get the heating effect of thermo parameters method more evenly.The heating means can be big
Gas chamber, multiposition measuring atom magnetometer biomagnetic measurement field application provide reference.
(3) under the premise of not influencing no magnetoelectricity heating heating efficiency, using the method for finite element analysis, optimization heating temperature
Degree condition is, it can be achieved that alkali metal gas chamber heating temperature field uniformity is substantially improved.
(4) promotion of Uniformity of Temperature Field, so that the uniformity of atom magnetometer atmospheric chamber, more site primer signals obtains
It greatly improves, is of great significance to its application in biomagnetic measurement field.
Detailed description of the invention
Fig. 1 is the flow chart that heating means of the present invention are realized；
Fig. 2 is the heating structure schematic diagram that heating means of the present invention are realized.
Specific embodiment
The following describes the present invention in detail with reference to the accompanying drawings and embodiments.
As shown in Figure 1, specific implementation step of the invention is as follows:
(1) Fig. 2 is a kind of typical alkali metal gas chamber heating structure, and similar four side structures are symmetrical structure, bottom
Face and surface structure it is different be unsymmetric structure, first according to alkali metal gas chamber 4 and its outside heating ceramic 3 practical ruler
The physical model of very little its analysis of building；Constructed physical model is imported into finite element analysis software, according to alkali metal gas chamber 4
Institute's inflatable body type and the material of heating ceramic 3, determine its respective thermal coefficient and convection coefficient, foundation in material, gas chamber
The thermodynamic parameter of these parameter setting finite element analyses, to complete to add as composed by alkali metal gas chamber and its heating structure
The building of the finite element analysis model of hot systems.
(2) according to finite element analysis model constructed in (1), the heating temperature T of four side heat films 2 is first fixed1
(such as: 180 DEG C) changes the heating temperature T of bottom surface and top heating film 12, to the certain heating temperature difference (T2-T1) in range (such as :-
40~40 DEG C) multiple temperature spots carry out finite element analysis, to gas indoor temperature field obtained under each heating temperature condition
Steady-state distribution result seek coefficient of variation CV, with (T2-T1) it is abscissa, it is vertical sit with CV value corresponding under the heating condition
Mark described point simultaneously carries out curve fitting, and solves corresponding (T when CV obtains minimum according to fitting result2-T1) temperature value,
It obtains in T1At a temperature of optimum heating temperature T2Value.The calculation formula of temperature field coefficient of variation CV is as follows:
Wherein f is the standard deviation of plenum interior thermo parameters method, TaverFor the mean temperature of plenum interior.
The calculation formula of f is as follows:
Wherein T indicates to be located at the steady temperature value at coordinate points (x, y, z), and V indicates the volume of alkali metal gas chamber.
The mean temperature T of plenum interioraverCalculation formula it is as follows:
Taver=∫ ∫ ∫ Tdxdydz/V
(3) T obtained according to step (2)1At a temperature of optimum heating temperature T2, accurately controlled using feedback control principle
It is pasted onto the heating temperature of heating film on the alkali metal gas chamber heating structure plane of symmetry and asymmetric face, used temperature control is closed
Ring feedback system is by temperature transducer, PID control circuit and power amplifier composition；The heating temperature of heating film is monitored by temperature transducer
Degree heats temperature to heating film to realize by the output power of PID control electronic feedback control power amplifier according to temperature monitoring result
The accurate control of degree, to obtain the most uniform heating effect of alkali metal plenum interior thermo parameters method.
The content that description in the present invention is not described in detail belongs to the prior art well known to professional and technical personnel in the field.
Although the illustrative specific embodiment of the present invention is described above, in order to which the technical staff of this technology neck understands this
Invention, it should be apparent that coming the present invention is not limited to the range of specific embodiment to those skilled in the art
It says, as long as various change is in the spirit and scope of the present invention that the attached claims limit and determine, these variations are aobvious
And be clear to, all are using the innovation and creation of present inventive concept in the column of protection.
Claims (6)
1. a kind of alkali metal gas chamber non-uniform heating methods based on finite element analysis, it is characterised in that: the following steps are included:
(1) physical model of alkali metal gas chamber and its heating structure is constructed according to the heating structure of alkali metal gas chamber first；Then
Constructed physical model is imported into finite element analysis software, according to the performance of alkali metal gas chamber and its heating structure material
The thermodynamic parameter of finite element analysis is arranged in parameter, to complete to heat as composed by alkali metal gas chamber and its heating structure
The building of the finite element analysis model of system；
(2) based on finite element analysis model constructed by step (1), first fixed base metal air chamber outside heating structure symmetric part
The heating temperature T of heating surface1, change the heating temperature T in the asymmetric face of heating structure outside alkali metal gas chamber2, carry out finite element fraction
Analysis, and calculate in different T2At a temperature of alkali metal plenum interior Steady-State Thermal Field obtained coefficient of variation CV value；With (T2-
T1) it is abscissa, with (T2-T1) corresponding to CV value be ordinate carry out described point and carry out curve fitting, solved according to fitting result
CV obtains (T corresponding when minimum out2-T1) temperature value, that is, obtain in T1At a temperature of optimum heating temperature T2's
Value；
(3) T obtained according to step (2)1At a temperature of optimum heating temperature T2It is accurately controlled and is pasted onto using feedback control principle
The heating temperature of heating film on the alkali metal gas chamber heating structure plane of symmetry and asymmetric face, to obtain alkali metal plenum interior temperature
Spend the most uniform heating effect of field distribution.
2. a kind of alkali metal gas chamber non-uniform heating methods based on finite element analysis according to claim 1, feature
Be: the step (1) physical model passes through SolidWorks, ProE or Autodesk Inventor software building；Add
Hot systems finite element analysis model is constructed by the completion of ANSYS, COMSOL or NASTRAN software.
3. a kind of alkali metal gas chamber non-uniform heating methods based on finite element analysis according to claim 1, feature
Be: in the step (2), the calculation formula of alkali metal plenum interior temperature field coefficient of variation CV is as follows:
Wherein f is the standard deviation of plenum interior thermo parameters method, TaverFor the mean temperature of plenum interior.
4. a kind of alkali metal gas chamber non-uniform heating methods based on finite element analysis according to claim 3, feature
Be: the calculation formula of the f is as follows:
Wherein T indicates to be located at the steady temperature value at coordinate points (x, y, z), and V indicates the volume of alkali metal gas chamber.
5. a kind of alkali metal gas chamber non-uniform heating methods based on finite element analysis according to claim 3, feature
It is: the mean temperature T of plenum interioraverCalculation formula it is as follows:
Taver=∫ ∫ ∫ Tdxdydz/V.
6. a kind of alkali metal gas chamber non-uniform heating methods based on finite element analysis according to claim 1, feature
Be: temperature used by the step (3) controls closed loop feedback system by temperature transducer, PID control circuit and power amplifier group
At；The heating temperature that heating film is monitored by temperature transducer controls function by PID control electronic feedback according to temperature monitoring result
The output power put is to realize the accurate control to heating film heating temperature.
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| JP2016079470A (en) * | 2014-10-17 | 2016-05-16 | 日立Ｇｅニュークリア・エナジー株式会社 | Defect progress suppression method |
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| CN105403322A (en) * | 2015-12-11 | 2016-03-16 | 东南大学 | Apparatus and method for measuring temperature distribution in alkali metal air chamber of atom magnetometer |
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