CN108366446A - Microwave heating temperature field control method based on electromagnetic fiele - Google Patents
Microwave heating temperature field control method based on electromagnetic fiele Download PDFInfo
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- CN108366446A CN108366446A CN201810329638.8A CN201810329638A CN108366446A CN 108366446 A CN108366446 A CN 108366446A CN 201810329638 A CN201810329638 A CN 201810329638A CN 108366446 A CN108366446 A CN 108366446A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/66—Circuits
- H05B6/68—Circuits for monitoring or control
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Abstract
A kind of microwave heating temperature field control method based on electromagnetic fiele, it is characterised in that：For the industrial microwave heating system with multiple microwave sources, make each microwave source at any time with different Power operations by the power of each microwave source of real-time, STOCHASTIC CONTROL, a large amount of continually changing electromagnetic field modes of resonance are formed in microwave cavity, are improved by the temperature uniformity on heated components surface using the random back-off effect between a large amount of electromagnetic field modes of resonance in a period of time.Invention significantly improves the temperature uniformities by heated components in microwave heating process.
Description
Technical field
The present invention relates to a kind of Temperature Field Control method, especially a kind of microwave heating temperature field control method, specifically
Say it is a kind of microwave heating temperature field control method based on electromagnetic fiele.
Background technology
Microwave is the electromagnetic wave that frequency is 300M to 300GHz, and the principle of microwave heating is that the electromagnetic field that high frequency changes makes
Polar molecule in material occurs high frequency and moves repeatedly, and intermolecular generation severe friction by microwave energy so that be converted to thermal energy.Base
In above-mentioned heating mechanism, microwave heating is fast with heating speed, part thickness direction temperature gradient is small, selectivity heats, is easy to
The series of advantages such as control, are therefore widely used in the various fields such as food processing, material processing, chemical synthesis.
However, microwave heating technique has seriously threatened food there are the piece surface global problem that temperature distribution is non-uniform
The Forming Quality that is safe and healthy, influencing part processing of product processing, the further genralrlization for hindering microwave heating technique use.It should
The basic reason of problem is that multiple reflections occur on closed cavity wall surface for microwave, and incidence wave and back wave are sent out in cavity
Life is interfered and ultimately forms stable standing wave.Near antinode, electric field or magnetic field intensity are high, and the vibration of inside parts polar molecule is acute
Strong, heating is rapid, temperature is high, forms hot localised points；Near node, electric field or magnetic field intensity are close to zero, inside parts pole
Property molecular vibration is slight does not vibrate even, heating slowly, temperature it is low, form local cold spot.Existing method uses rotary-tray
Or the mode of mode stirrer is realized by the relative motion between heated components and electromagnetic field, using between different electromagnetic field pattern with
Machine compensating effect is improved by the temperature uniformity on heated components surface.But since rotary-tray and mode stirrer are with certain
Rate carries out 360 ° of Periodic Rotatings, and only a small amount of electromagnetic field mode of resonance is superimposed in piece surface, and random back-off probability is low, right
The improvement unobvious of piece surface temperature uniformity.
In view of the above-mentioned problems, the present invention provides a kind of microwave heating temperature field control method based on electromagnetic fiele, it is right
In the industrial microwave heating system with multiple microwave sources, made by the power of each microwave source of real-time, STOCHASTIC CONTROL each micro-
Wave source forms a large amount of continually changing electromagnetic field resonant modes at any time with different Power operations in microwave cavity
Formula, random back-off probability is high, is carried using existing a large amount of random back-off effects between a large amount of electromagnetic field modes of resonance in a period of time
The temperature uniformity of high piece surface to be heated.
Invention content
The purpose of the present invention is be directed to the non-uniform problem in piece surface temperature field existing for microwave heating technique, invention one
Microwave heating temperature field control method of the kind based on electromagnetic fiele.
The technical scheme is that：
A kind of microwave heating temperature field control method based on electromagnetic fiele, it is characterised in that：For with multiple micro-
The industrial microwave heating system of wave source makes each microwave source when arbitrary by the power of each microwave source of real-time, STOCHASTIC CONTROL
It carves with different Power operations, a large amount of continually changing electromagnetic field modes of resonance is formed in microwave cavity, when using one section
Random back-off effect between interior a large amount of electromagnetic field modes of resonance improves the temperature uniformity of piece surface to be heated.
The microwave heating temperature field control method based on electromagnetic fiele uses each microwave of following formula real-time control
The power in source：
Wherein, P indicates the real-time output power of each microwave source, PeIndicate that the rated power of each microwave source, a are one
Range existsIt arrivesBetween random number, make to generate electromagnetic fiele in microwave cavity, to ensure by heated components surface temperature
The uniformity of degree；WithThe random power bracket for combination defining each microwave source output, passes through adjustingWithValue come
The general power of microwave source output is adjusted to realize that the mean temperature of piece surface follows process curve.
When microwave heating starts, initial value is
When needing to increase power, ifThen according to by the real-time monitoring temperature of heated components and setting temperature
Control to error signal closed loop between degreeValue；IfThen according to by the real-time monitoring temperature of heated components and setting temperature
Control to error signal closed loop between degreeValue.
When needing to reduce power, ifThen according to by the real-time monitoring temperature of heated components and setting temperature
Control to error signal closed loop between degreeValue；IfThen according to by the real-time monitoring temperature of heated components and setting temperature
Control to error signal closed loop between degreeValue.
Beneficial effects of the present invention：
The present invention generates electromagnetic fiele using the strategy of STOCHASTIC CONTROL power in microwave cavity, utilizes electromagnetic fiele
Random back-off effect between a large amount of modes of resonance generated in microwave cavity improves uniform by the temperature on heated components surface
Property.Invention significantly improves the temperature uniformities by heated components in microwave heating process.
Specific implementation mode
With reference to embodiment, the present invention is further illustrated.
The present embodiment uses chopped carbon fiber felt/epoxy resin composite material tablet (long 250mm, wide 250mm, thick 2mm)
As by heated components；Using the octagon High performance industrial micro-wave oven with No. 16 microwave sources as heating equipment, Mei Gewei
The rated power of wave source is 800W；Measure the surface temperature of composite material in real time using 20 channel fluorescence optical fiber temperature measurement systems；It adopts
The power for using LabVIEW programs as control software pair No. 16 microwave source regulates and controls.
It will be put into microwave cavity by heated components, equably laid on piece surface and fix 20 road fluorescence optical fibers biographies
Sensor, the mean temperature that 20 road fluorescent optical fiber sensors are measured is as adjustment per the control signal of road microwave source power.It will be micro-
Microwave heating system is opened after the sealing of wave cavity.Target process curve is imported in LabVIEW programs, LabVIEW programs are used in combination
According to the power of each microwave source of strategy adjustment control as follows：
In formula, a be in LabVIEW programs each random number generator in real time (period 5000ms) generate one betweenWithBetween random number, due to the operation power of each microwave source be betweenWithBetween it is different random
Number (pe=800W), therefore a large amount of electromagnetic field modes of real-time change can have been encouraged in microwave cavity, utilize a large amount of electromagnetism
Existing a large amount of random back-off effects improve the temperature uniformity of piece surface between field mode.In the process, using pid algorithm
Adjustment in real timeOrValue it is horizontal to control the electromagnetic field general power in microwave cavity, realize the mean temperature of piece surface
Process curve is followed.
When microwave heating starts, initial value is
When needing to increase power, ifThen according to by the real-time monitoring temperature of heated components and setting temperature
Control to error signal closed loop between degreeValue；
E (t) is the real-time measurement error between the mean temperature and set temperature of composite material component port surface, K in formulaP=
20, TI=0.95, TD=0.5 is respectively ratio, integral, differential coefficient.IfThen according to by the real-time monitoring of heated components
Control to error signal closed loop between temperature and set temperatureValue.
When needing to reduce power, ifThen according to by the real-time monitoring temperature of heated components and setting temperature
Control to error signal closed loop between degreeValue；
IfThen controlled according to the error signal closed loop between the real-time monitoring temperature and set temperature by heated components
SystemValue.
After the power signal of each microwave source determines in LabVIEW, controlled using pci data capture card and power of controlled silicon
Device exports power control signal in real time to corresponding microwave source, and part is realized while improving piece surface temperature uniformity
Mean temperature follows in real time to set temperature process curve.
Above-mentioned power control step is repeated, until completing the microwave heating process of part.
The specific application example that the above is only the present invention, is not limited in any way protection scope of the present invention.All uses
Equivalents or equivalence replacement and the technical solution formed, all fall within rights protection scope of the present invention.
Part that the present invention does not relate to is the same as those in the prior art or can be realized by using the prior art.
Claims (2)
1. a kind of microwave heating temperature field control method based on electromagnetic fiele, it is characterised in that：For with multiple microwaves
The industrial microwave heating system in source makes each microwave source at any time by the power of each microwave source of real-time, STOCHASTIC CONTROL
With different Power operations, a large amount of continually changing electromagnetic field modes of resonance are formed in microwave cavity, utilize a period of time
Random back-off effect between interior a large amount of electromagnetic field modes of resonance is improved by the temperature uniformity on heated components surface.
2. according to the method described in claim 1, it is characterized in that：Using the power of each microwave source of following formula real-time control：
Wherein, P indicates that the real-time output power of each microwave source, a are that a range existsIt arrivesBetween random number, PeIt indicates
The rated power of each microwave source.
When microwave heating starts, initial value is
When needing to increase power, ifThen according between the real-time monitoring temperature and set temperature by heated components
Error signal closed loop controlValue；IfThen according between the real-time monitoring temperature and set temperature by heated components
Error signal closed loop controlValue.
When needing to reduce power, ifThen according between the real-time monitoring temperature and set temperature by heated components
Error signal closed loop controlValue；IfThen according between the real-time monitoring temperature and set temperature by heated components
Error signal closed loop controlValue.
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