CN102799788B - For the method being solved copper core temperature by fiber optic temperature of photoelectric composite submarine cable - Google Patents
For the method being solved copper core temperature by fiber optic temperature of photoelectric composite submarine cable Download PDFInfo
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- CN102799788B CN102799788B CN201210262023.0A CN201210262023A CN102799788B CN 102799788 B CN102799788 B CN 102799788B CN 201210262023 A CN201210262023 A CN 201210262023A CN 102799788 B CN102799788 B CN 102799788B
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Abstract
The present invention relates to a kind of method being solved copper core temperature by fiber optic temperature for photoelectric composite submarine cable, the method mainly comprises: thermal force current margin, environment temperature when (1) lists photoelectric composite submarine cable work from scope, environmental convection coefficient of heat transfer scope, and carry out uniform discrete respectively; (2) using fiber optic temperature Tf and I, G, H parameter as input variable X, copper core temperature Tc is as output variable.(3) measure by experiment and gather the output optical fibre temperature Tf of photoelectric composite submarine cable under different thermal force working current I, environment temperature G, environmental convection coefficient of heat transfer H and copper core Tc; X and Tc forms m*n*p input-output sample pair; (4) radial basis function based on the multilayer feedforward neural network of radial basis function selects Gaussian function.(5) multilayer feedforward neural network is to m*n*p input-output sample to learning, and learning algorithm is NNCA algorithm, obtains w after study
i, c
i, σ
ivalue, i=1,2,3 ..., N; (6) formula is utilized
copper core temperature T can be solved by I, G, H, Tf
c.
Description
Technical field
The present invention relates to photoelectric composite submarine cable monitoring temperature and automatic measurement technology, specifically refer to a kind of method being solved copper core temperature by fiber optic temperature for photoelectric composite submarine cable.
Background technology
Photoelectric composite submarine cable inside, can simultaneously for subsea power and telecommunication cable simultaneously containing some copper cores and optical fiber.Copper core in photoelectric composite submarine cable transmits high-power power under water and copper core can be caused to generate heat, seabed harsh environments and electric energy harmonic wave easily cause the local ageing of photoelectric composite submarine cable material, reduce the pyroconductivity of photoelectric composite submarine cable material and the contact heat transfer coefficient of storeroom, the copper core temperature of photoelectric composite submarine cable is caused to raise, can thermal breakdown be caused time serious, irreversible destruction is produced to photoelectric composite submarine cable.
Therefore need to monitor the copper core temperature of photoelectric composite submarine cable.Directly cannot measure the temperature of copper core after photoelectric composite submarine cable puts into operation, but Brillouin optical time domain analysis equipment (abbreviation BOTDA equipment) can be utilized to obtain fiber optic temperature.So solve copper core temperature field problem to be converted into how by fiber optic temperature inversion prediction copper core temperature.Common method is by carrying out thermal field modeling to photoelectric composite submarine cable, and the fiber optic temperature under acquisition different loads, boundary condition and the mapping table of copper core temperature, utilize lookup table mode to solve copper core temperature after obtaining fiber optic temperature.Set up fiber optic temperature and copper core vs. temperature table comprises following steps: (1) carries out Geometric Modeling to photoelectric composite submarine cable inner structure; (2) specify the inner different materials of photoelectric composite submarine cable and storeroom Thermal Parameter, comprise material pyroconductivity, material contact heat-conduction coefficient, density, specific heat capacity etc.; (3) stress and strain model is carried out to photoelectric composite submarine cable geometry; (4) thermal force (working current) and boundary condition (environment temperature and the environmental convection coefficient of heat transfer) is specified; (5) finite element method is adopted to solve the temperature of the inner diverse location of photoelectric composite submarine cable; (6) mapping form of fiber optic temperature and copper core temperature is set up.The weak point of the method is to need to demarcate the inside different materials of photoelectric composite submarine cable and storeroom Thermal Parameter, and the Thermal Parameter accuracy rate of demarcation is low, and calibration process at substantial manpower and materials.
Therefore a kind of method proposing improvement is needed.
Summary of the invention
For the problems referred to above, fundamental purpose of the present invention is to provide a kind of method being solved copper core temperature by fiber optic temperature for photoelectric composite submarine cable, by setting up from fiber optic temperature to the forecast model of copper core temperature, copper core temperature can be solved under the condition of known fiber optic temperature.
The present invention solves above-mentioned technical matters by following technical proposals: a kind of method being solved copper core temperature by fiber optic temperature for photoelectric composite submarine cable, is characterized in that: said method comprising the steps of:
(1) thermal force current margin when listing photoelectric composite submarine cable work is [I
1, I
2], by thermal force working current uniform discrete, discrete interval is 1 ampere, and indicates with variable I, and the span of I is { i
1, i
2, i
3..., i
m, wherein i
1for being less than I
1maximum integer, i
mfor being greater than I
2smallest positive integral;
(2) list environment temperature boundary condition during photoelectric composite submarine cable work, environment temperature is [T from scope
1, T
2], by even for environment temperature dispersion, discrete interval is 1 degree Celsius, and indicates with variable G, and the span of G is { g
1, g
2, g
3..., g
n, wherein g
1for being less than G
1maximum integer, g
nfor being greater than G
2smallest positive integral;
(3) list environmental convection coefficient of heat transfer boundary condition during photoelectric composite submarine cable work, environmental convection coefficient of heat transfer scope is [H
1, H
2], by environmental convection coefficient of heat transfer uniform discrete, discrete interval is 1 wattage per square meter every degree Celsius, and represents with variable H, and the span of H is { h
1, h
2, h
3..., h
p, wherein h
1for being less than H
1maximum integer, h
pfor being greater than H
2smallest positive integral;
(4) set copper core temperature as T
c, fiber optic temperature is T
f, copper core temperature T
cwith T
f, I, G, H funtcional relationship be T
c=f (T
f, I, G, H), formula f shows copper core temperature T
cone group of higher dimensional space input variable T
f, I, G, H be to the Output rusults of one-dimensional space Nonlinear Mapping; If higher dimensional space input variable T
f, I, G, H form input variable X, T
cfor output variable, T
cwith the Nonlinear Mapping relation between X adopts the multilayer feedforward neural network based on radial basis function to carry out approaching of arbitrary accuracy;
(5) the output optical fibre temperature T of collection photoelectric composite submarine cable under different thermal force working current I, environment temperature G, environmental convection coefficient of heat transfer H is measured by experiment
fwith copper core T
c; Due to I have m element, G has n element, H has p element, I, G, H have m*n*p IGH input combination, and each IGH inputs compound action in photoelectric composite submarine cable, can produce different fiber temperature T
fwith copper core temperature T
c, therefore X and T
cforming the right number of input-output sample is m*n*p;
(6) radial basis function based on the multilayer feedforward neural network of radial basis function selects Gaussian function, output variable T
cwith the relational expression of input variable X be:
n gets 1000; Based on radial basis function multilayer feedforward neural network to step (5) generate by X and T
cm*n*p input-output sample of composition is to learning, learning algorithm is NNCA algorithm, the Nonlinear Mapping rule that learning process Automatic Extraction input-output sample centering is contained, distributed store, in the weight matrix be connected with each layer of neural network, can determine w after study
i, c
i, σ
ivalue, i=1,2,3 ..., N;
(7) thermal force working current I, environment temperature G, environmental convection coefficient of heat transfer H and fiber optic temperature T is obtained by measuring in practical application
fafterwards, formula is utilized
solve copper core temperature T
c.
Positive progressive effect of the present invention is: the method solving copper core temperature by fiber optic temperature for photoelectric composite submarine cable provided by the invention has the following advantages: the method solving copper core temperature by fiber optic temperature for photoelectric composite submarine cable that the present invention relates to overcomes original needs when measuring and solve the method for copper core temperature in photoelectric composite submarine cable and demarcates the inside different materials of photoelectric composite submarine cable and storeroom Thermal Parameter, the Thermal Parameter accuracy rate of demarcating is low, and the defect of calibration process at substantial manpower and materials, the present invention devises a kind of brand-new measuring method, fiber optic temperature is mainly utilized to solve copper core temperature, method is simple, practical and the performance of cable own is not destroyed.
Accompanying drawing explanation
Fig. 1 is the structural representation needing a kind of photoelectric composite submarine cable measuring copper core temperature in the present invention.
Fig. 2 is method structure flow chart of the present invention.
Embodiment
Present pre-ferred embodiments is provided, to describe technical scheme of the present invention in detail below in conjunction with accompanying drawing.
Fig. 1 is the structural representation needing a kind of photoelectric composite submarine cable measuring copper core temperature in the present invention.As shown in Figure 1: need a kind of photoelectric composite submarine cable measuring copper core temperature to comprise three copper conductors 1 that block water, there is conductor shielding 2 on every root copper conductor 1 surface that blocks water, the skin of conductor shielding 2 has XLPE to insulate 3, the skin of XLPE insulation 3 is provided with insulation shielding 4, the skin of insulation shielding 4 is provided with semiconductor water blocking layer 5, semiconductor water blocking layer 5 is outer is that the cable of alloy lead cover 6 and anticorrosive coat 7, three conductors and a fiber unit composition is followed successively by serving 8 from outside to inside, wire armoring 9, PP restrict inner cushion layer 10, band 11 successively; Filler cells 13 is filled with in the space of three conductors and a fiber unit 12.
Fig. 2 is method structure flow chart of the present invention.Implement the present invention can adopt with the following method:
(1) load when photoelectric composite submarine cable works and boundary condition scope is obtained.In the present embodiment, the scope of the thermal force working current I of photoelectric composite submarine cable is [200,400], has 201 values after carrying out uniform discrete; Environment temperature G scope is [4-25], has 22 values after carrying out uniform discrete; The scope of environmental convection coefficient of heat transfer H is [5-30], has 26 values after carrying out uniform discrete.
(2) build photoelectric composite submarine cable measurement environment, obtain input and output sample pair.Measuring process is subdivided into following sub-step:
The original ambient temperature G that <1> adjusts photoelectric composite submarine cable is 4 degrees Celsius;
The initial environment convection transfer rate H that <2> adjusts photoelectric composite submarine cable is 5 wattage per square meter every degree Celsius;
The thermal force working current that <3> adjusts photoelectric composite submarine cable is 200 amperes;
<4>, after photoelectric composite submarine cable heat trnasfer enters stable state, distinguishes survey record fiber optic temperature T by Brillouin optical time domain analysis equipment and thermopair
fwith copper core temperature T
c.
The thermal force working current I of photoelectric composite submarine cable is increased by 1 ampere by <5> successively, repeats step <4>, until thermal force working current is increased to 400 amperes;
The initial environment convection transfer rate H of photoelectric composite submarine cable is increased by 1 wattage per square meter every degree Celsius by <6> successively, repeats step <3>, <4>, <5>;
The original ambient temperature G of photoelectric composite submarine cable is increased by 1 degree Celsius by <7> successively, repeats step <2>, <3>, <4>, <5>, <6>;
After above-mentioned 7 sub-steps, by I, G, H, T
fthe input variable X of composition has 201*22*26=114972 element, corresponding output variable T
calso 114972 elements are had.
(3) with step (2) obtain by X and T
cthe input and output sample pair of composition, carries out NNCA algorithm study to the multilayer feedforward neural network selecting Gaussian function as radial basis function, calculates formula
in w
i, c
i, σ
ivalue, i=1,2,3 ..., N, N get 1000;
(4) copper core temperature when photoelectric composite submarine cable runs can obtain thermal force working current I, environment temperature G, environmental convection coefficient of heat transfer H and fiber optic temperature T in measurement
fbasis on, utilize the Nonlinear Mapping relation formula that step (1), (2), (3) obtain
calculate and obtain.
The method solving copper core temperature by fiber optic temperature for photoelectric composite submarine cable that the present invention relates to overcomes original needs when measuring and solve the method for copper core temperature in photoelectric composite submarine cable and demarcates the inside different materials of photoelectric composite submarine cable and storeroom Thermal Parameter, the Thermal Parameter accuracy rate of demarcating is low, and the defect of calibration process at substantial manpower and materials, the present invention devises a kind of brand-new measuring method, fiber optic temperature is mainly utilized to solve copper core temperature, method is simple, practical and do not destroy the performance of cable own.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications; these changes and improvements all fall in the claimed scope of the invention, and application claims protection domain is defined by appending claims and equivalent thereof.
Claims (1)
1., for the method being solved copper core temperature by fiber optic temperature of photoelectric composite submarine cable, it is characterized in that: said method comprising the steps of:
(1) thermal force current margin when listing photoelectric composite submarine cable work is [I
1, I
2], by thermal force working current uniform discrete, discrete interval is 1 ampere, and indicates with variable I, and the span of I is { i
1, i
2, i
3..., i
m, wherein i
1for being less than I
1maximum integer, i
mfor being greater than I
2smallest positive integral;
(2) list environment temperature boundary condition during photoelectric composite submarine cable work, ambient temperature range is [T
1, T
2], by even for environment temperature dispersion, discrete interval is 1 degree Celsius, and indicates with variable G, and the span of G is { g
1, g
2, g
3..., g
n, wherein g
1for being less than G
1maximum integer, g
nfor being greater than G
2smallest positive integral;
(3) list environmental convection coefficient of heat transfer boundary condition during photoelectric composite submarine cable work, environmental convection coefficient of heat transfer scope is [H
1, H
2], by environmental convection coefficient of heat transfer uniform discrete, discrete interval is 1 wattage per square meter every degree Celsius, and represents with variable H, and the span of H is { h
1, h
2, h
3..., h
p, wherein h
1for being less than H
1maximum integer, h
pfor being greater than H
2smallest positive integral;
The scope of the thermal force working current I of photoelectric composite submarine cable is [200,400], has 201 values after carrying out uniform discrete; Environment temperature G scope is [4-25], has 22 values after carrying out uniform discrete; The scope of environmental convection coefficient of heat transfer H is [5-30], has 26 values after carrying out uniform discrete;
(4) set copper core temperature as T
c, fiber optic temperature is T
f, copper core temperature T
cwith T
f, I, G, H funtcional relationship be T
c=f (T
f, I, G, H), formula f shows copper core temperature T
cone group of higher dimensional space input variable T
f, I, G, H be to the Output rusults of one-dimensional space Nonlinear Mapping; If higher dimensional space input variable T
f, I, G, H form input variable X, T
cfor output variable, T
cwith the Nonlinear Mapping relation between X adopts the multilayer feedforward neural network based on radial basis function to carry out approaching of arbitrary accuracy;
(5) the output optical fibre temperature T of collection photoelectric composite submarine cable under different thermal force working current I, environment temperature G, environmental convection coefficient of heat transfer H is measured by experiment
fwith copper core T
c; Due to I have m element, G has n element, H has p element, I, G, H have m*n*p IGH input combination, and each IGH inputs compound action in photoelectric composite submarine cable, can produce different fiber temperature T
fwith copper core temperature T
c, therefore X and T
cforming the right number of input-output sample is m*n*p;
(6) radial basis function based on the multilayer feedforward neural network of radial basis function selects Gaussian function, output variable T
cwith the relational expression of input variable X be:
n gets 1000; Based on radial basis function multilayer feedforward neural network to step (5) generate by X and T
cm*n*p input-output sample of composition is to learning, learning algorithm is NNCA algorithm, the Nonlinear Mapping rule that learning process Automatic Extraction input-output sample centering is contained, distributed store, in the weight matrix be connected with each layer of neural network, can determine w after study
i, c
i, σ
ivalue, i=1,2,3 ..., N;
(7) thermal force working current I, environment temperature G, environmental convection coefficient of heat transfer H and fiber optic temperature T is obtained by measuring in practical application
fafterwards, formula is utilized
solve copper core temperature T
c.
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2012
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| US4157526A (en) * | 1977-02-22 | 1979-06-05 | Davies John S | Multi-stage heat sensing cable and emergency communication system |
| WO2006135657A2 (en) * | 2005-06-09 | 2006-12-21 | Imura International U.S.A. Inc. | Tag assembly for radio frequency identification controlled heatable objects |
| CN101497424A (en) * | 2008-01-29 | 2009-08-05 | 中国科学院合肥物质科学研究院 | Nano cable composed of semimetal bismuth and metal copper and synthetic method thereof |
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