JP2007106140A - Demagnetization processing system for vessel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate the necessity for the calculation of a hull magnetism for each section of a vessel having a complicated shape/structure, to shorten the period of time for a demagnetization process by simplifying the calculation for the hull magnet, and to increase the demagnetization performance. <P>SOLUTION: A hull magnetism simulation form 28 is defined by estimating a hull magnetic behavior from data indicating the shape/structure of the vessel 4. The hull magnetism is calculated from the defined hull magnetism simulation form. A processing device which demagnetizes in such a manner that a magnetic variation occurring on the outside of the hull may be reduced by using a set value for a demagnetization element obtained from the hull magnetism is provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a ship demagnetization processing system, and more particularly, to a ship demagnetization processing system that simplifies calculation of hull magnetism, shortens the time of demagnetization processing, and improves demagnetization performance.

  Ships are magnetized or generate a magnetic field in the hull due to the influence of geomagnetism, and also generate a magnetic field due to an electric current flowing through an electric device to be mounted. The magnetism generated by the hull includes (1) induction magnetism, (2) permanent magnetism, (3) eddy current magnetic field, and (4) stray magnetic field.

(1) Induction magnetism is magnetism generated in response to geomagnetism in a hull made of a magnetic material, and the generated magnetism changes when the direction of the hull changes with respect to the lines of magnetic force.
(2) Permanent magnetism is generated when a magnetic material constituting a hull is magnetized by impact, heat, or stress during construction or repair of the hull. The size of the permanent magnetism is determined by the orientation of the building site and the hull with respect to the geomagnetism.
(3) An eddy current magnetic field is a magnetic field generated when an eddy current flows through a nonmagnetic material such as copper or aluminum moving in the geomagnetism, and has the same principle as a generator.
These (1) to (3) are generated by geomagnetism.

On the contrary,
(4) The stray magnetic field is a magnetic field generated around the electric wire by a direct current flowing through the electric wire of the electric device mounted on the ship, and the magnetic field changes depending on the magnitude of the flowing current.

  The ship's magnetism or magnetic field of the hull causes disturbance to the external magnetic field due to movement, so that the hull's magnetic detection becomes possible, so the demagnetization processing system demagnetizes the hull magnetism during construction, Demagnetizes the ship's magnetism at regular intervals.

  Some ship demagnetization processing systems obtain a set value of a demagnetization element from the ship's hull magnetism, and demagnetize it using this set value so as to reduce the magnetic change that occurs outside the hull.

  For example, in a ship degaussing processing system, a set value of a demagnetizing current to be passed through a degaussing coil, which is a demagnetizing element arranged on the hull, is obtained from the ship's hull magnetism, and the degaussing current of the obtained set value is passed through the degaussing coil. There are some that demagnetize the induced magnetism.

As such a ship demagnetization processing system, a plurality of degaussing coils and a plurality of magnetic detectors are installed in the hull in order to cancel the external magnetic field of the hull made of a magnetic material. By determining the demagnetizing current that minimizes the external magnetic field from the outboard magnetic moment calculated based on magnetism and the outboard magnetic moment due to each demagnetizing coil effect measured and calculated in advance, and energizing each degaussing coil There are those that always maintain the optimum demagnetization state.
JP-A-8-78234

  By the way, in the conventional ship demagnetization processing system, the ship magnetism is calculated from the shape and structure of the ship, the set value of the demagnetization element is obtained from the ship magnetism, and the magnetism generated outside the ship hull using the set value of the demagnetization element. Demagnetized to reduce change.

  However, in a conventional ship demagnetization processing system, a complex shape and structure is provided for each part of the hull, which has a structure such as a bridge in the upper part and a variety of equipment such as an engine inside. Since the hull magnetism is calculated in consideration, there is a problem that the calculation of the hull magnetism is complicated, and it takes time for the degaussing process, and there is a disadvantage that the demagnetization performance is lowered.

  The present invention defines a hull magnetic simulation form from the data indicating the shape and structure of the hull, assuming the hull magnetic properties, calculates the hull magnetism from the defined hull magnetic simulation form, and obtains it based on the hull magnetism. The present invention is characterized in that a processing device is provided for demagnetizing so as to reduce the magnetic change generated outside the hull using the set value of the demagnetizing element.

  Since the ship demagnetization processing system according to the present invention calculates the ship's magnetic field from the ship's magnetic simulation form defined assuming the ship's magnetic properties, it has a complicated shape and structure for each part of the ship as in the prior art. It is not necessary to calculate the hull magnetism in consideration, the calculation of the hull magnetism can be simplified, the demagnetization processing time can be shortened, and the demagnetization performance can be improved.

The ship demagnetization processing system according to the present invention calculates ship hull magnetism from a ship hull magnetic simulation shape defined on the assumption of ship hull magnetic properties, thereby simplifying the calculation of hull magnetism and shortening the time of demagnetization processing. This improves the demagnetization performance.
Embodiments of the present invention will be described below with reference to the drawings.

  1 to 3 show an embodiment of the present invention. In FIG. 1, 2 is a ship, 4 is a hull, 6 is a structure, and 8 is a device. The ship 2 includes a structure 6 having a complicated shape such as a bridge on the upper part of the hull 4, and various devices 8 such as an engine are mounted inside the hull 4.

  The degaussing processing system 10 of the ship 2 is configured as shown in FIG. In this embodiment, the degaussing processing system 10 of the ship 2 is demagnetized so as to reduce the magnetic change generated outside the hull 4 by arranging a demagnetizing coil 12 as a demagnetizing element in the hull 4 and flowing a demagnetizing current. Is.

  The demagnetization processing system 10 of the ship 2 is provided with a processing device 14, and the data input means 16 and the degaussing coil 12 disposed on the hull 4 are connected to the processing device 14. The demagnetization processing system 10 reads data necessary for the demagnetization processing from the data input means 16 to the processing device 14, processes the data in the processing device 14 to obtain a setting value of the demagnetizing element, and uses the obtained setting value. The degaussing current is applied to the degaussing coil 12 disposed in the hull 4 to demagnetize the magnetic change generated outside the hull 4.

  The demagnetization processing system 10 includes a processing unit 14 that includes a reading unit 18, a simulated form defining unit 20, a hull magnetic calculation unit 22, a set value calculation unit 24, and a current supply unit 26.

  The reading means 18 reads data indicating the shape / structure of the hull 4 from the data input means 16 as data necessary for the degaussing process of the ship 2. The simulated form defining means 20 defines the ship body magnetic simulated form 28 assuming the ship body magnetic properties of the ship 2 from the read data indicating the shape and structure of the ship body 4. In this embodiment, as shown in FIG. 1, the ship body magnetic simulation form 28 is defined as a spheroid that is long in the fore-and-aft direction.

  The hull magnetism calculating means 22 calculates hull magnetism from the hull magnetism simulated shape 28 of the defined spheroid. The set value calculation means 24 obtains a set value of the demagnetizing element from the calculated value of the hull magnetism. In this embodiment, the value of the demagnetizing current to be passed through the degaussing coil 12 arranged in the hull 4 is obtained as the demagnetizing element setting value. The current supply means 26 supplies the degaussing coil 12 with a demagnetizing current having a value corresponding to the determined setting value of the demagnetizing element.

  Next, the operation of this embodiment will be described.

  As shown in FIG. 3, the degaussing processing system 10 of the ship 2 reads data indicating the shape and structure of the hull 4 as data necessary for the demagnetizing process (100), and uses the data to simulate the hull magnetic simulation 28. Is defined as a spheroid that is long in the fore-and-aft direction (102).

  The hull magnetism is calculated from the hull magnetism simulated shape 28 of the defined spheroid (104), and the set value of the demagnetizing current flowing through the degaussing coil 12 which is a demagnetizing element arranged in the hull 4 is obtained from the calculated value of the hull magnetism. (106) A demagnetizing current having a value corresponding to the determined setting value of the demagnetizing element is supplied to the degaussing coil 12 (108).

  Thereby, the demagnetization processing system 10 demagnetizes so as to reduce the magnetic change generated outside the hull 4.

  As described above, the degaussing processing system 10 of the ship 2 demarcates the ship body magnetic simulation form 28 assuming the ship body magnetic property from the data indicating the shape and structure of the ship body 4, and from the ship body magnetic simulation form 28 thus defined. Since the hull magnetism is calculated, it is not necessary to calculate the hull magnetism considering a complicated shape and structure for each part of the hull 4 as in the prior art.

  For this reason, the demagnetization processing system 10 can simplify the calculation of the ship magnetism and shorten the time for the demagnetization processing, and can improve the demagnetization performance.

  4 to 7 show another embodiment. In the present embodiment, portions having the same functions as those of the above-described embodiment will be described with the same reference numerals.

  As shown in FIG. 4, the degaussing processing system 10 for the ship 2 according to this embodiment includes a structure 6 such as a bridge on the upper part of the hull 4, and various devices 8 such as an engine are mounted inside the hull 4. As shown in FIG. 5, when the ship body magnetism is calculated from the spheroid ship body magnetic simulation form 28 defined for the ship 2 having a complicated shape and structure assuming the ship body magnetic properties, as shown in FIG. This eliminates the difference between the calculated value and the actually measured value in the direction.

  As shown in FIG. 6, the degaussing processing system 10 of the ship 2 of this embodiment connects a data input means 16 and a degaussing coil 12 arranged on the hull 4 to the processing device 14. The processing device 14 includes a reading unit 18, a simulated form defining unit 20, a hull magnetic calculation unit 22, a set value calculation unit 24, and a current supply unit 26, and further includes a correction unit 30.

  The reading means 18 reads data indicating the shape / structure of the hull 4 from the data input means 16 as data necessary for the degaussing process of the ship 2. The simulated form defining means 20 defines the ship body magnetic simulated form 28 assuming the ship body magnetic properties of the ship 2 from the read data indicating the shape and structure of the ship body 4. In this embodiment, as shown in FIG. 4, the ship body magnetic simulation form 28 is defined as a spheroid that is long in the bow-tail direction.

  The hull magnetism calculating means 22 calculates hull magnetism from the hull magnetism simulated shape 28 of the defined spheroid. The set value calculation means 24 obtains a set value of the demagnetizing element from the calculated value of the hull magnetism. In this embodiment, the value of the demagnetizing current to be passed through the degaussing coil 12 arranged in the hull 4 is obtained as the demagnetizing element setting value. The current supply means 26 supplies a demagnetizing current having a value corresponding to the determined setting value of the demagnetizing element to the degaussing coil 12.

  The correction means 30 corrects the hull magnetic simulation form 28 to be increased or decreased by the weight form 32 so as to increase or decrease the calculated value of the hull magnetism according to the position of the ship 2 in the bow-stern direction.

  As shown in FIG. 4, the correction means 30 of this embodiment takes into account the deviation between the calculated value on the stern side and the actually measured value, and increases the calculated value toward the stern side of the ship 2. The stern side of the hull magnetic simulation form 28 is weight-corrected by the weight form 32. As shown in FIG. 4, the weight form 32 of this embodiment is a sphere in consideration of the complex shape and structure of the ship 2, and the hull magnetism of the spheroid so as to fill the gap between the calculated value and the actual measurement value. A plurality of weights are applied to the stern side of the simulated feature 28.

  Next, the operation of this embodiment will be described.

  As shown in FIG. 7, the degaussing processing system 10 of the ship 2 reads data indicating the shape and structure of the hull 4 as data necessary for the degaussing processing into the processing device 14 (200). Is defined as a spheroid that is long in the stern direction (202).

  The defined spheroid hull magnetic simulation feature 28 is weighted with a sphere weight feature 32 on the stern side of the spheroid hull magnetic simulation feature 28 so as to increase the calculated value of the hull magnetism toward the stern side. Correct (204).

  The ship magnetism is calculated from the weight-corrected spheroid ship magnetism simulated form 28 (206), and the set value of the demagnetizing current flowing through the demagnetizing coil 12 which is a demagnetizing element arranged in the ship 4 is calculated from the calculated value of the ship magnetism. Determination (208), and a degaussing current having a value corresponding to the determined setting value of the demagnetizing element is supplied to the degaussing coil 12 (210).

  Thereby, the demagnetization processing system 10 demagnetizes so as to reduce the magnetic change generated outside the hull 4.

  Thus, the degaussing processing system 10 of the ship 2 calculates the hull magnetism from the hull magnetic simulation form 28 defined as a spheroid elongated in the bow-stern direction assuming the hull magnetic property of the ship 2. In consideration of the shape and structure of the ship 2, the stern side of the spheroid hull magnetic simulation form 28 is weight-corrected by the weight form 32 so that the calculated value is increased toward the stern side.

  Thereby, the degaussing processing system 10 of the ship 2 can bring the calculated value of the ship's magnetism close to the actually measured value, and is generated in the determined demagnetizing element setting value due to the difference between the calculated value and the actually measured value. The error can be reduced. As a result, the degaussing current flowing through the degaussing coil 12 is not excessively or deficient, and a degaussing current having an appropriate value can be passed through the degaussing coil 12, thereby improving the degaussing performance. can do.

  In this alternative embodiment, the load magnetic body 32 is subjected to load correction by the weighted structure 32 so as to increase the calculated value, but the calculated value is decreased according to the deviation between the calculated value and the actually measured value. Further, the hull magnetic simulation form 28 can be reduced and corrected by the weight form 32.

  The present invention is not limited to the above-described embodiments, and various application modifications can be made.

  For example, in the above-described embodiment, a sphere is exemplified as the weight feature 32. However, as shown in FIGS. 8 and 9, the outer peripheral surface of the weight feature 32 has a constant inclination angle that fills the deviation between the calculated value and the actually measured value. By rotating the stern side of the spheroid hull magnetic simulation form 28 with the weight form 32 of the rotation hollow frustoconical body whose outer peripheral surface has a constant inclination angle, a plurality of spheres Compared with the ship magnetic simulation model 28 in which the weight form 32 is weight-corrected, the calculation of the ship magnetism can be further simplified to shorten the demagnetization processing time, and the demagnetization performance can be improved.

  In addition, the weighted body 32 is not only a rotating hollow truncated cone whose outer peripheral surface has a constant inclination angle, but also a rotating hollow circular truncated cone having a convex curved surface whose outer peripheral surface protrudes outward as shown in FIG. As shown in FIG. 10 (B), a rotating hollow frustoconical body having a concave curved surface whose outer peripheral surface is recessed inward can also be used.

  Further, in this embodiment, the hull magnetic simulation form 28 is defined as a spheroid that is long in the bow-stern direction. However, as shown in FIG. Assuming the ship's magnetic property of the ship 2 from the plane shape and the side shape of the ship 2, the ship's magnetic simulation form 28 has a plurality of short cylindrical shapes with different diameters at appropriate intervals in the bow-stern direction. By defining the shape portions 28-1 to 28-n as continuous rotating solid bodies, each shape portion 28-1 to 28-n is a simple short cylindrical body. Processing time can be shortened and demagnetization performance can be improved.

  The ship demagnetization processing system according to the present invention simplifies the calculation of the hull magnetism and can shorten the demagnetization processing time, and can improve the demagnetization performance. It can also be applied to processing.

FIG. 6 is a correspondence diagram between a ship and an example of a ship body magnetic simulation form showing an embodiment. It is a system configuration figure of a degaussing processing system of a ship showing an example. It is a flowchart of a degauss process which shows an Example. FIG. 6 is a correspondence diagram between a ship and a ship body magnetic simulation form showing another embodiment. It is a figure explaining the shift | offset | difference of the calculated value and the measured value of ship magnetism which show another Example. It is a system block diagram of the degaussing processing system of the ship which shows another Example. It is a flowchart of a degauss process which shows another Example. It is a correspondence figure of a ship and a ship body magnetic simulation form which shows the 1st example of application. It is a side view of the weight form which consists of a rotation hollow truncated cone of the ship body magnetic simulation form which shows a 1st application example. The modification of a 1st application example is shown, (A) is a side view of the weight form which consists of a rotation hollow frustum of a convex curve, (B) is a side view of the weight form which consists of a rotation hollow frustum of a concave curve It is. It is a correspondence diagram of a ship and a ship body magnetic simulation form which shows the 2nd example of application.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Ship 4 Hull 6 Structure 8 Equipment 10 Demagnetization processing system 12 Demagnetization coil 14 Processing device 16 Data input means 18 Reading means 20 Simulated form demarcation means 22 Hull magnetic calculation means 24 Set value calculation means 26 Current supply means 28 Hull magnetic simulation form 30 Correction means 32 Weighted form

Claims (3)

  Determining the hull magnetism from the data indicating the shape and structure of the hull, demarcating the hull magnetism, calculating the hull magnetism from this hull magnetism, and demagnetizing elements determined based on this hull magnetism A ship demagnetization processing system comprising a processing device that demagnetizes so as to reduce a magnetic change generated outside the hull using the set value.   The processing device includes simulated shape defining means for defining a ship magnetic simulation form assuming the ship's magnetic characteristics of the ship, and the simulated form defining means defines the ship magnetic simulation form as a spheroid elongated in the bow-stern direction. The degaussing system for a ship according to claim 1.   The processing device includes a correction unit that corrects the ship magnetic simulation model, and the correction unit weights the ship magnetic simulation model so as to increase or decrease the calculated value of the ship magnetism according to the position of the ship's bow and tail. 2. The ship demagnetization processing system according to claim 1, wherein the correction is made by a shape.

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