CN107238809A - Ship induced field measuring method based on magnetic field map between body subdivision and measuring point - Google Patents
Ship induced field measuring method based on magnetic field map between body subdivision and measuring point Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a kind of ship induced field measuring method based on magnetic field map relation between body subdivision unit and measuring point, including：Ship can be enclosed in interior body by selecting one, and be several body unit by its subdivision, if its center is calculating point；The magnetic field combination for setting each coil current and producing above-mentioned calculating point is into matrix Be；Before ship is introduced into degaussing stations, the magnetic field of each Sensor is gathered, B is designated asbj；It is powered successively by each coil current of setting, magnetic field is gathered again and by BbjSubtract, obtain Bc0；After ship enters degaussing stations, magnetic field is gathered and by BbjSubtract, obtain Bship；It is powered successively by each coil current is set, magnetic field is gathered again and by BbjAnd BshipSubtract, obtain Bc1；Use Bc1Subtract corresponding Bc0, obtain Bc；According to CoeK*Be=Bc, CoeK can be obtained, and then try to achieve the corresponding induced field of ship.Beneficial effect of the present invention：The precision and efficiency of ship induced field measurement are improved, a large amount of manpower and materials are saved.
Description
Technical field
The present invention relates to ship degaussing technical field, specifically refer to a kind of ship induced field measuring method.
Background technology
Ship magnetic field typically refers to the magnetic field that ship is produced in its surrounding space, is soldier in various magnetic detecting equipment and water
Device is used for the Main physical for detecting and attacking.To resist the attack of magnetic weapons and aerial magnetic detecting in water, it is necessary to ship
Implement magnetic defense measure, and it is the important prerequisite for implementing magnetic defense measure accurately to grasp ship induced field.Ship senses
Magnetic field can be obtained by 2 class methods：Numerical method and magnetic-field measurement method.It is commonly used in the number of Ship ' induced field
Value, which calculates class method, FInite Element, integral equation method etc., but due to having that Ship Structure is complicated, various magnetic material parameters not
The factors such as easily accurate acquisition, the precision of numerical result is also difficult to ensure that at present.Ship sense is obtained in magnetic-field measurement class method
Two kinds of common methods for answering magnetic field are that double course method (can only obtain vertical and horizontal induced field)+two-place measurement methods (can only be obtained
Take vertical induced field) and earth magnetism simulation (can obtain longitudinally, laterally with vertical induced field).Ship is measured with double course methods
During induced field, because ship is bulky, the bodily form is special, and the entrance of degaussing stations and navigation channel are narrow so that ship turnover is adjusted
The process for changing course is very time-consuming, laborious；It is easy to change in addition, ship exchanges its parking place behind course, accordingly
Magnetic-field measurement position coordinates, which is difficult to ensure that, to immobilize, therefore can cause certain measurement error.The vertical induced field of ship
It can be obtained in theory by two-place measurement method, but actually due to that can not ensure that ship is navigated by water in two latitude phases in long range
Between magnetic state keep the uniformity of constant and two places magnetic field measurement system technical indicator, therefore this method is in practice and precision
On be all infeasible.Traditional earth magnetism simulation in the earth magnetism former-wound coil of degaussing stations (or magnetic compensation coil) by leading to
Electricity changes local earth's magnetic field, according to the change Ship ' induced field of ship magnetic field before and after energization.This method can avoid turning
The waste of human and material resources caused by course and two-place measurement, and can substantially shorten the acquisition time of induced field, but application
Its precision of induced field that this method is obtained and the earth magnetism field uniformity height correlation simulated.Due to the limitation of various factors,
Magnetic field produced by the bucking coil of degaussing stations is unable to reach the preferable uniformity, and ship is bigger, and the uniformity is poorer, thus surveys
The induced field precision obtained can not ensure, so as to greatly limit promoting the use of for earth magnetism simulation.
The content of the invention
For the above-mentioned technical problem in correlation technique, magnetic between body subdivision unit and measuring point is based on the invention provides one kind
The ship induced field measuring method of field mapping relations.
In order to realize the purpose of the present invention, the technical solution adopted in the present invention is：
A kind of ship induced field measuring method based on magnetic field map relation between body subdivision unit and measuring point, including it is following
Step：
S1：Ship can be enclosed in interior body by choosing one, carried out grid cell subdivision to the body, taken each body unit
Center for calculate point；
S2：Degaussing stations are laid with for the longitudinal coil for compensating earth's magnetic field, transverse coil and each some groups of vertical coil,
Where it is assumed that be laid with x groups longitudinal coil (X01, X02 ..., X0x), y groups transverse coil (Y01, Y02 ..., Y0y) and z groups hang down
To coil (Z01, Z02 ..., Z0z), wherein x, y, z be positive integer.Set each coil current and calculate each coil in above-mentioned calculating
The magnetic field that point is produced, is designated as B respectivelyeX01、BeX02、…、BeX0x、BeY01、BeY02、…、BeY0y、BeZ01、BeZ02、…、BeZ0z, by this
A little magnetic field combinations are into matrix Be, the magnetic field matrix that referred to as each coil is produced in each body unit；
S3：Before ship is introduced into degaussing stations, the magnetic field of each Sensor is gathered, B is designated asbj；
S4：Before ship is introduced into degaussing stations, it is powered successively by each coil current set in S2, gathers each sensor and survey
The magnetic field of point and by BbjSubtract, B is as a result designated as respectivelyc0X01、Bc0X02、…、Bc0X0x、Bc0Y01、Bc0Y02、…、Bc0Y0y、Bc0Z01、
Bc0Z02、…、Bc0Z0z, wherein x, y, z is positive integer；
S5：After ship enters degaussing stations, the magnetic field of each Sensor is gathered, and by BbjSubtract, be as a result designated as Bship；
S6：After ship enters degaussing stations, it is powered successively by each coil current set in step S2, gathers each sensor
The magnetic field of measuring point and by BbjAnd BshipSubtract, B is as a result designated as respectivelyc1X01、Bc1X02、…、Bc1X0x、Bc1Y01、Bc1Y02、…、Bc1Y0y、
Bc1Z01、Bc1Z02、…、Bc1Z0z, wherein x, y, z is positive integer；
S7：Use Bc1X01Subtract corresponding Bc0X01, obtain the ship magnetic field B under coil X01 energization magnetic fieldscX01；Together
Reason can obtain BcX02、…、BcX0x、BcY01、BcY02、…、BcY0y、BcZ01、BcZ02、…、BcZ0z, wherein x, y, z is positive integer, by this
A little magnetic field combinations are into matrix Bc, i.e., the magnetic field matrix that ship is produced under the effect of each coil magnetic field；
S8：Utilize matrix BeAnd BcBetween relation set up matrix equation CoeK*Be=Bc, CoeK is relational matrix, existing BeWith
BcCoeK is obtained, it is known that therefore can solve；
S9：Each body unit is calculated into point magnetic field longitudinal component and is set to magnetic-field component of the local earth's magnetic field along ship longitudinal direction
Value, remaining component is set to 0, is multiplied with CoeK and can obtain ship longitudinal induction magnetic field；Similarly, it can obtain ship transvercal induction
Magnetic field and vertical induced field.
Beneficial effects of the present invention：
The present invention is magnetized using the magnetic field produced by the existing each group magnetic compensation coil of degaussing stations to ship, is passed through
Measurement and analysis, which are resolved, obtains induced field of the ship under local geomagnetic field action, mainly make use of each coil in each body unit
Mapping relations between the magnetic field matrix that the magnetic field matrix and ship of generation are produced under the effect of each coil magnetic field, pass through the mapping
Relation can obtain the induced field of ship.
Compared with prior art, do not make any uniform the beneficial effects of the invention are as follows the magnetic field produced to magnetic compensation coil
Requirement in terms of degree, so that this method can not only improve the precision and efficiency of the measurement of ship induced field, is saved substantial amounts of
Manpower and materials, and it can be widely popularized in existing degaussing stations and use.If being applied to the design of new degaussing stations and building
Make, will significantly save pork barrel.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to institute in embodiment
The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also be obtained according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is a kind of ship based on magnetic field map relation between body subdivision unit and measuring point described according to embodiments of the present invention
The schematic diagram of oceangoing ship induced field measuring method；
Fig. 2 is longitudinal coil schematic diagram；
Fig. 3 is transverse coil schematic diagram；
Fig. 4 is vertical coil schematic diagram；
In figure：1- calculates point；2- body units；3- array of magnetic sensors.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, all other embodiment that those of ordinary skill in the art are obtained belongs to what the present invention was protected
Scope.
A kind of ship based on magnetic field map relation between body subdivision unit and measuring point described in the embodiment of the present invention senses magnetic
Field measurement method, comprises the following steps：
Step 1)：As shown in figure 1, ship can be enclosed in interior body by choosing one.Without loss of generality, one is chosen here
Individual cuboid slightly larger than Ship's Dimension simultaneously makes ship be located in cuboid, its center and cuboid center superposition.By cuboid
Subdivision is m individual cells, takes the center of each body unit to calculate point, then it is m to calculate point number.
Step 2)：Without loss of generality, it is assumed that certain degaussing stations is laid with 3 groups of longitudinal coils (X01, X02, X03), 4 groups of transverse directions
Coil (Y01, Y02, Y03, Y04) and 5 groups vertical coil (Z01, Z02, Z03, Z04, Z05), totally 12 groups of coils, coil schematic diagram
Respectively as shown in Figure 2, Figure 3 and Figure 4.By taking coil X01 as an example, it is assumed that electric current I is passed in coilX01, theorem is cut down according to than Ao-Sa
Coil X01 can be calculated the magnetic field that point is produced is calculated at above-mentioned m, be designated as BeX01.It similarly can obtain BeX02、BeX03、BeY01、
BeY02、BeY03、BeY04、BeZ01、BeZ02、BeZ03、BeZ04、BeZ05, by these magnetic field combinations into matrix Be, referred to as each coil is in each body
The magnetic field matrix that unit is produced.
Step 3)：In order to measure ship magnetic field, degaussing stations are laid with array of magnetic sensors as shown in Figure 1.Assuming that magnetic is passed
Sensor number is n.Before ship is introduced into degaussing stations, the magnetic field that each Magnetic Sensor is measured is gathered, B is designated asbj。
Step 4)：Before ship is introduced into degaussing stations, by taking coil X01 as an example, it is assumed that electric current I is passed in coilX01, collection
Magnetic field that each Magnetic Sensor is measured and by BbjSubtract, be as a result designated as Bc0X01.It similarly can obtain Bc0X02、Bc0X03、Bc0Y01、Bc0Y02、
Bc0Y03、Bc0Y04、Bc0Z01、Bc0Z02、Bc0Z03、Bc0Z04、Bc0Z05。
Step 5)：After ship enters degaussing stations, the magnetic field that each Magnetic Sensor is measured is gathered, and by BbjSubtract, as a result remember
For Bship。
Step 6)：After ship enters degaussing stations, by taking coil X01 as an example, it is assumed that electric current I is passed in coilX01, collection is respectively
Magnetic field that Magnetic Sensor is measured and by BbjAnd BshipSubtract, be as a result designated as Bc1X01.It similarly can obtain Bc1X02、Bc1X03、Bc1Y01、
Bc1Y02、Bc1Y03、Bc1Y04、Bc1Z01、Bc1Z02、Bc1Z03、Bc1Z04、Bc1Z05。
Step 7)：Use Bc1X01Subtract corresponding Bc0X01, obtain the ship magnetic field under coil X01 energization magnetic fields
BcX01；It similarly can obtain BcX02、BcX03、BcY01、BcY02、BcY03、BcY04、BcZ01、BcZ02、BcZ03、BcZ04、BcZ05, by these magnetic fields
It is combined into matrix Bc, the magnetic field matrix that referred to as ship is produced under the effect of each coil magnetic field；
Step 8)：Ferromagnetic object (ship of such as iron structure) is magnetized by externally-applied magnetic field (such as earth's magnetic field or coil magnetic field)
Afterwards in any site P (x of its surrounding spaceP,yP,zP) produced by magnetic field BPIt can be expressed as：
In formula：V is volume shared by ferromagnetic object；M(rQ) it is the additional magnetization that externally-applied magnetic field is produced inside ferromagnetic object
Intensity；rpFor site radius vector；rQFor source point radius vector；rpQ=rp-rQ；Bp(rp) it is rpLocate the row arrow of magnetic field intensity three-component value composition
Amount；To carry out gradient calculation to source point coordinate；To carry out gradient calculation to site coordinate.
If the integration carried out to ferromagnetic object in body unit subdivision, formula (1) will be transformed to summation.To linear material iron
For magnetic object or uniform ferromagnetic object, formula (1) will be ultimately formed a system of linear equations：
CM=B (2)
In formula：M is the externally-applied magnetic field additional intensity of magnetization that each unit is produced inside ferromagnetic object；C is subdivision unit coupling
Syzygy matrix number；The column vector that B is made up of the externally-applied magnetic field magnetic field that each unit is produced inside ferromagnetic object.
Matrix element in formula (2) is expanded to cuboid subdivision unit as shown in Figure 1, then can obtain another line
Property equation group：
C1·M1=Be1 (3)
M after extension1Some of matrix element due to its corresponding body unit be located at air in and be zero, it is corresponding by
M1The measuring point magnetic field of generation is：
C2·M1=Bc1 (4)
Convolution (3) and formula (4) can be obtained：
OrderBy each coil of degaussing stations body unit calculate point at generation magnetic field combination into
Matrix Be, the ship magnetic field encouraged by each coil magnetic field at Magnetic Sensor measuring point is combined into matrix Bc, then have：
CoeK·Be=Bc (6)
From formula (6) it could be assumed that：The magnetic field that coil is produced at body unit is respectively calculated with measuring point by coil magnetic field
Mapping relations are there are between the ship magnetic field of excitation, as long as obtaining this mapping relations, so that it may solve ship in any earth magnetism
Induced field under field action.
B in formula (6)eAnd BcIt is known quantity, therefore can solves and obtain CoeK：
Step 9)：Each body unit is calculated into point magnetic field longitudinal component and is set to magnetic field minute of the local earth's magnetic field along ship longitudinal direction
Value, remaining component is set to 0, is multiplied with CoeK and can obtain ship longitudinal induction magnetic field；Similarly, it can obtain ship laterally sense
Answer magnetic field and vertical induced field.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God is with principle, and any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (4)
1. a kind of ship induced field measuring method based on magnetic field map relation between body subdivision unit and measuring point, its feature exists
In comprising the following steps：
S1：Ship can be enclosed in interior body by choosing one, ship is located in the body, and the body is carried out into grid
Subdivision is m individual cells, takes the center of each body unit to calculate point；
S2：Degaussing stations lay longitudinal coil, transverse coil and each some groups of vertical coil, wherein, it is laid with x group longitudinal coils
(X01, X02 ..., X0x), y groups transverse coil (Y01, Y02 ..., Y0y) and the vertical coil of z groups (Z01, Z02 ..., Z0z), its
Middle x, y, z is positive integer, sets each coil current and calculates the magnetic field that each coil is produced in above-mentioned calculating point, by these magnetic field groups
Synthesize the magnetic field matrix B that each coil is produced in each body unite；
S3：Before ship is introduced into degaussing stations, the magnetic field of each Sensor for the array of magnetic sensors that collection degaussing stations are laid
Bbj；
S4：Before ship is introduced into degaussing stations, it is powered successively by each coil current set in step S2, gathers each Magnetic Sensor
The magnetic field of measuring point and by BbjSubtract, B is as a result designated as respectivelyc0X01、Bc0X02、…、Bc0X0x、Bc0Y01、Bc0Y02、…、Bc0Y0y、Bc0Z01、
Bc0Z02、…、Bc0Z0z, wherein x, y, z is positive integer；
S5：After ship enters degaussing stations, the magnetic field of each Sensor for the sensor array that collection degaussing stations are laid, and will
BbjSubtract, be as a result designated as Bship；
S6：After ship enters degaussing stations, it is powered successively by each coil current set in step S2, gathers each Sensor
Magnetic field and by BbjAnd BshipSubtract, B is as a result designated as respectivelyc1X01、Bc1X02、…、Bc1X0x、Bc1Y01、Bc1Y02、…、Bc1Y0y、
Bc1Z01、Bc1Z02、…、Bc1Z0z, wherein x, y, z is positive integer；
S7：Use Bc1X01Subtract corresponding Bc0X01, obtain the ship magnetic field B under coil X01 energization magnetic fieldscX01；Similarly may be used
Obtain BcX02、…、BcX0x、BcY01、BcY02、…、BcY0y、BcZ01、BcZ02、…、BcZ0z, wherein x, y, z is positive integer, by these magnetic
Field is combined into matrix Bc, i.e., the magnetic field matrix that ship is produced under the effect of each coil magnetic field；
S8：Utilize matrix BeAnd BcBetween relation set up matrix equation CoeKBe=Bc, CoeK is relational matrix, existing BeAnd Bc
CoeK is obtained, it is known that therefore solving；
S9：Each body unit is calculated into point magnetic field longitudinal component and is set to magnetic-field component value of the local earth's magnetic field along ship longitudinal direction, its
Remaining component is set to 0, is multiplied with CoeK and obtains ship longitudinal induction magnetic field；Similarly, obtain ship transvercal induction magnetic field and hang down
To induced field.
2. the ship induced field measurement according to claim 1 based on magnetic field map relation between body subdivision unit and measuring point
Method, it is characterised in that in the step S2, each coil is calculated in above-mentioned m calculating point generation according to theorem is cut down than Ao-Sa
Magnetic field.
3. the ship induced field measurement according to claim 2 based on magnetic field map relation between body subdivision unit and measuring point
Method, it is characterised in that in the step S3, Magnetic Sensor number is n, before ship is introduced into degaussing stations, gathers each magnetic and passes
The magnetic field B that sensor is measuredbj。
4. the ship induced field measurement according to claim 3 based on magnetic field map relation between body subdivision unit and measuring point
Method, it is characterised in that in the step S8, ferromagnetic object magnetized by externally-applied magnetic field after in any site P of its surrounding space
(xP,yP,zP) produced by magnetic field BPIt is expressed as：
Wherein：V is volume shared by ferromagnetic object；M(rQ) it is the additional intensity of magnetization that externally-applied magnetic field is produced inside ferromagnetic object；
rpFor site radius vector；rQFor source point radius vector；rpQ=rp-rQ；Bp(rp) it is rpLocate the column vector of magnetic field intensity three-component value composition；
▽QTo carry out gradient calculation to source point coordinate；▽pTo carry out gradient calculation to site coordinate；
If the integration carried out to ferromagnetic object in body unit subdivision, formula (1) will be transformed to summation, to linear material ferromagnetic
For body or uniform ferromagnetic object, formula (1) will be ultimately formed a system of linear equations：
CM=B (2)
Wherein：M is the externally-applied magnetic field additional intensity of magnetization that each unit is produced inside ferromagnetic object；C is subdivision unit coupled systemes
Matrix number；The column vector that B is made up of the externally-applied magnetic field magnetic field that each unit is produced inside ferromagnetic object；
The body unit that matrix element in formula (2) is expanded in the step S1, then can obtain another system of linear equations：
C1·M1=Be1 (3)
M after extension1Some of matrix element is corresponding by M because its corresponding body unit is located in air and is zero1Production
Raw measuring point magnetic field is：
C2·M1=Bc1 (4)
Convolution (3) and formula (4) can be obtained：
OrderEach coil of degaussing stations is calculated into the magnetic field combination of generation at point into matrix in body unit
Be, the ship magnetic field encouraged by each coil magnetic field at Magnetic Sensor measuring point is combined into matrix Bc, then following matrix equation is set up：
CoeK·Be=Bc (6)
B in formula (6)eAnd BcIt is known quantity, therefore can solves and obtain CoeK：
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| CN117310574A (en) * | 2023-11-28 | 2023-12-29 | 华中科技大学 | Method for acquiring magnetic field conversion matrix, external magnetic field measurement method and system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108489514A (en) * | 2018-03-19 | 2018-09-04 | 中国船舶重工集团公司第七0四研究所 | The method that unilateral transverse direction earth magnetism former-wound coil measures induced field Ziy |
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| CN117310574A (en) * | 2023-11-28 | 2023-12-29 | 华中科技大学 | Method for acquiring magnetic field conversion matrix, external magnetic field measurement method and system |
| CN117310574B (en) * | 2023-11-28 | 2024-02-13 | 华中科技大学 | Method for acquiring magnetic field conversion matrix, external magnetic field measurement method and system |
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| Publication number | Publication date |
|---|---|
| CN107238809B (en) | 2019-07-26 |
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