JP2014106547A - Magnetic disturbance suppression support device and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic disturbance suppression support device and a program which can effectively and inexpensively suppress an influence of magnetic disturbance.SOLUTION: In a magnetic disturbance suppression support device, a CPU 12 is configured to: acquire terrestrial magnetism information indicating a state of terrestrial magnetism when a structure comprising a magnetic material does not exist in a predetermined area including a target space of magnetic disturbance suppression; estimate an amount of magnetic material of the structure which is installed in the area and comprises the magnetic material; derive terrestrial magnetic distribution or declination distribution in the area by simulating magnetic disturbance that occurs in the area due to the magnetic material of the structure on the basis of the terrestrial magnetism information, the estimated amount of the magnetic material and an installation position of the structure; determine an installation position of the magnetic material and the amount of magnetic material to be installed at the installation position in order to suppress the magnetic disturbance that occurs due to the magnetic material of the structure, on the basis of the terrestrial magnetic distribution or the declination distribution.

Description

  The present invention relates to a magnetic disturbance suppression support apparatus and program, and more particularly, to a magnetic disturbance suppression support apparatus and program that supports suppression of magnetic disturbance in a space where magnetic field uniformity is required.

  Conventionally, in order to calibrate an orientation meter mounted on an aircraft, an adjustment area of the orientation meter in which the geomagnetic disturbance is sufficiently small and the geomagnetic declination is uniformed is required in an aircraft manufacturing facility, an airfield, etc. Yes. The declination of geomagnetism is the angle of deviation of north (magnetic north) on the magnetic field with respect to geographical north (true north). The declination of geomagnetism varies depending on the region and age. For example, in the vicinity of Japan as of 2012, it is about 6 to 10 degrees.

  The adjustment area is a large space with a circumference of several tens of meters so that an aircraft can enter and exit. In the adjustment region, the magnetic disturbance is required to be within a prescribed state (MIL-STD-765A (MILITARY STANDARD COMPASS SWINGING, AIRCRAFT, GENERAL REQUIREMENTS FOR), 0.2 degrees). However, in reality, there may be a case where a magnetic disturbance more than specified is generated in the adjustment region due to the influence of a magnetic material such as a reinforcing bar or a steel frame provided in a structure provided in or around the adjustment region.

  On the other hand, it is also known that an exposure apparatus that exposes an electron beam needs to suppress magnetic disturbance in a region serving as an electron beam movement path in order to control the movement path of the electron beam. As a technique for suppressing this magnetic disturbance, for example, Patent Document 1 discloses a magnetic shield apparatus that attenuates magnetic disturbance from the outside in an area where it is necessary to suppress magnetic disturbance in an exposure apparatus and actively performs magnetic shielding. It is disclosed. The magnetic shield device includes a magnetic sensor group that measures the amount of magnetic fluctuation, an electromagnetic coil group that is provided corresponding to each magnetic sensor, and applies a magnetic field to the location where the magnetic sensor is provided, and a magnetic sensor group. And a controller group for controlling the electromagnetic coil group.

Japanese Patent Laid-Open No. 2003-167038

  If the surrounding area is a size of about several tens of centimeters, such as an area where it is necessary to suppress magnetic disturbance in the exposure apparatus, the magnetic shielding is performed by the magnetic shielding material or the magnetic shielding by the active magnetic shielding apparatus disclosed in Patent Document 1. An area where the disturbance is sufficiently small can be created.

  However, if magnetic shielding is to be performed on a large-scale space having a circumference of several tens of meters, such as an adjustment area of an aircraft compass, a large space for the magnetic shielding is further required. In this case, it is expensive to produce a large-scale magnetic shield material or the like. Therefore, it cannot be said that magnetic shielding using a magnetic shielding material or the like for the adjustment region can effectively suppress the influence of magnetic disturbance at a low cost.

  Furthermore, in an accelerator that accelerates an electron beam, a technique for suppressing magnetic disturbance by performing magnetic shielding is used. However, in the case of an accelerator that is enlarged to emit a high-energy electron beam, the moving range of the electron beam ranges from several tens of meters to several hundreds of meters. Occur.

  The present invention has been made to solve such a problem, and an object thereof is to provide a magnetic disturbance suppression support apparatus and program capable of effectively suppressing the influence of magnetic disturbance at a low cost. It is in.

  In order to achieve the above object, a first magnetic disturbance suppression support device according to the present invention is a state in which there is no structure including a magnetic body in a predetermined region including a space to be a magnetic disturbance suppression target. An acquisition means for acquiring geomagnetic information indicating a state of geomagnetism, an accumulation means that is provided in the region and integrates the amount of the magnetic body of a structure including the magnetic body, and geomagnetic information acquired by the acquisition means, And by simulating the magnetic disturbance generated in the region due to the magnetic material of the structure based on the integrated amount of the magnetic material integrated by the integration means and the position of the structure, Deriving means for deriving a geomagnetic distribution or geomagnetic declination distribution, and the composition based on the geomagnetic distribution or geomagnetic declination distribution derived by the deriving means. And a determining means for determining an arrangement position of the magnetic substance arranged in the region so as to suppress a magnetic disturbance caused by the magnetic substance of the object and an amount of the magnetic substance arranged in the arrangement position. .

  According to the first magnetic disturbance suppression support device, the acquisition means indicates the state of geomagnetism in a state where there is no structure including a magnetic body in a predetermined region including a space to be subjected to magnetic disturbance suppression. Geomagnetic information is acquired. Moreover, in this invention, while being provided in the said area | region by the integrating | accumulating means, the quantity of the said magnetic body of the structure containing a magnetic body is integrated | accumulated.

  Furthermore, in the present invention, the magnetic material of the structure is calculated based on the geomagnetic information acquired by the acquisition device, the integrated amount of the magnetic material integrated by the integration device, and the position of the structure. Due to the simulation of the magnetic disturbance generated in the region, the geomagnetic distribution or the geomagnetic declination distribution in the region is derived.

  In the present invention, the determining means suppresses the magnetic disturbance caused by the magnetic material of the structure based on the geomagnetic distribution or the geomagnetic declination distribution derived by the deriving means. The arrangement position of the magnetic substance arranged in the region and the amount of the magnetic substance arranged at the arrangement position are determined.

  As described above, according to the first magnetic disturbance suppression support device of the present invention, the state of geomagnetism in the absence of the structure including the magnetic body, the amount of the magnetic body included in the structure, and the position of the structure Based on the above, a geomagnetic distribution or a geomagnetic declination distribution taking into account the magnetic disturbance caused by the magnetic material of the structure is derived. In the present invention, the arrangement state of the magnetic body is determined based on the derived geomagnetic distribution or the geomagnetic declination distribution. As a result, in the present invention, it is possible to effectively suppress the influence of magnetic disturbance at a low cost as compared with the case where a magnetic shield material, an active magnetic shield device, or the like is used.

  In the magnetic disturbance suppression support device according to the present invention, when the determination means derives the geomagnetic distribution by the deriving means, the deriving means is based on the geomagnetic declination at each point indicated by the geomagnetic distribution. When the declination distribution is derived by the above, based on the declination distribution, the difference between the maximum value and the minimum value of the geomagnetic declination at each point in the space to be suppressed is within a predetermined range. The arrangement position of the magnetic body, so that the difference in the space to be suppressed is within a predetermined range and the total amount of the magnetic body to be arranged is equal to or less than a predetermined value, Further, the amount of the magnetic material arranged at the arrangement position may be determined. Accordingly, it is possible to limit the geomagnetic declination angle and the total amount in the space targeted for suppression of the magnetic disturbance, and to effectively suppress the influence of the magnetic disturbance within the range of the limitation.

  Further, in the magnetic disturbance suppression support device of the present invention, the determining means is arranged such that the magnetic body is arranged in a predetermined second area in the area, and the arrangement position of the magnetic substance. You may make it determine the quantity of the magnetic body arrange | positioned to. Thereby, the area | region which does not arrange | position a magnetic body in the said area | region can be provided.

  On the other hand, in order to achieve the above object, the second magnetic disturbance suppression support device according to the present invention is in a state in which there is no structure including a magnetic body in a predetermined region including a space to be subjected to magnetic disturbance suppression. Acquisition means for acquiring geomagnetism information indicating the state of geomagnetism in the region; accumulation means for integrating the amount of the magnetic body of the structure including the magnetic body provided in the region; and geomagnetism acquired by the acquisition means By simulating the magnetic disturbance generated in the region due to the magnetic body of the structure based on the information, the accumulated amount of the magnetic body accumulated by the accumulation means and the position of the structure, Deriving means for deriving a geomagnetic distribution or declination distribution in a region; and display means for displaying the geomagnetic distribution or demagnetism distribution derived by the deriving means; A receiving unit that receives an input of an arrangement state of the magnetic body arranged in the region in the geomagnetic distribution or the geomagnetic declination distribution displayed by the display unit; and a magnetic body according to the arrangement state received by the receiving unit. And determining means for determining whether or not the difference between the maximum value and the minimum value of the geomagnetic declination at each point in the space to be suppressed when arranged is within a predetermined range.

  According to the second magnetic disturbance suppression support device, the acquisition means indicates a state of geomagnetism in a state where there is no structure including a magnetic body in a predetermined region including a space that is a magnetic disturbance suppression target. Geomagnetic information is acquired. Moreover, in this invention, while being provided in the said area | region by the integrating | accumulating means, the quantity of the said magnetic body of the structure containing a magnetic body is integrated | accumulated.

  Furthermore, in the present invention, the magnetic material of the structure is calculated based on the geomagnetic information acquired by the acquisition device, the integrated amount of the magnetic material integrated by the integration device, and the position of the structure. Due to the simulation of the magnetic disturbance generated in the region, the geomagnetic distribution or the geomagnetic declination distribution in the region is derived.

  In the present invention, the display unit displays the geomagnetic distribution or the geomagnetic declination distribution derived by the deriving unit. In the present invention, the accepting means accepts an input of an arrangement state of the magnetic body arranged in the region in the geomagnetic distribution or the geomagnetic declination distribution displayed by the display means. Furthermore, in the present invention, the determination means determines the maximum and minimum values of the geomagnetic declination at each point in the space to be suppressed when the magnetic material is arranged according to the arrangement state received by the receiving means. It is determined whether or not the difference falls within a predetermined range.

  Thus, according to the magnetic disturbance suppression support device of the present invention, based on the state of geomagnetism in the absence of the structure including the magnetic material, the amount of the magnetic material included in the structure, and the position of the structure. Then, the geomagnetic distribution or the declination distribution of the geomagnetism taking into account the magnetic disturbance caused by the magnetic material of the structure is derived. Also, in the present invention, it is possible to receive the input of the arrangement state of the magnetic body according to the derived geomagnetic distribution or the distribution of the declination of the geomagnetism, and suppress the influence of the magnetic disturbance when the magnetic body is arranged according to the received arrangement state. It is determined whether or not it is possible. As a result, in the present invention, it is possible to effectively suppress the influence of magnetic disturbance at a low cost as compared with the case where a magnetic shield material, an active magnetic shield device, or the like is used.

  In order to achieve the above object, the program of the present invention is a program for the geomagnetism in a state where there is no structure including a magnetic body in a predetermined region including a space for which a computer is to suppress magnetic disturbance. Acquisition means for acquiring geomagnetic information, integration means provided in the region and integrating the amount of the magnetic body of the structure including the magnetic body, geomagnetic information acquired by the acquisition means, and the integration Based on the accumulated amount of the magnetic body accumulated by the means and the position of the structure, by simulating the magnetic disturbance generated in the area due to the magnetic body of the structure, the geomagnetic distribution in the area or Deriving means for deriving a geomagnetic declination distribution, and the geomagnetic distribution derived by the deriving means or the geomagnetic declination distribution, In order to function as a determining means for determining an arrangement position of the magnetic substance arranged in the region and an amount of the magnetic substance arranged in the arrangement position so as to suppress magnetic disturbance generated due to the magnetic substance of the structure belongs to.

  Therefore, according to the program of the present invention, the computer is caused to act in the same manner as the first magnetic disturbance suppression support device, so that the influence of the magnetic disturbance can be effectively reduced at a low cost as in the first magnetic disturbance suppression support device. Can be suppressed.

  In the first magnetic disturbance suppression support device, the determining means uses the arrangement number of the magnetic bodies as a constant, the arrangement position and the amount of the magnetic bodies as variables, and the arrangement positions of the magnetic bodies. And the amount of the magnetic material to be arranged at the arrangement position may be determined. Thereby, compared with the case where the number of arrangement | positioning is not made into a constant, the arrangement | positioning state of the magnetic body arrange | positioned in order to suppress a magnetic disturbance can be derived | led-out at high speed.

  Further, in the first magnetic disturbance suppression support apparatus, the A-φ method in which the geomagnetic information is information indicating a uniform magnetic field, and the derivation unit performs magnetic field analysis using a magnetic vector potential and an electric scalar potential. The geomagnetic distribution or declination distribution in the space to be suppressed may be derived by performing computer simulation by a finite element method using a side element based on the above. Thereby, the influence of magnetic disturbance can be effectively suppressed at low cost by a conventionally known calculation method.

  Further, in the first magnetic disturbance suppression support device, the acquisition unit further acquires structure information of the structure including information indicating a magnetic body in the structure, and the integration unit includes the acquisition unit. The amount of magnetic material in the structure may be integrated using the structure information acquired by the above. Thereby, the quantity of the magnetic body contained in a structure can be obtained simply and correctly.

  Further, the first magnetic disturbance suppression support device further includes a measuring unit that measures a geomagnetic distribution around the structure, and the integrating unit causes the geomagnetic distribution measured by the measuring unit to coincide with the geomagnetic distribution. The amount of the magnetic material in the structure may be integrated by performing a simulation. Thereby, even if it is a case where structure information cannot be acquired, the quantity of the magnetic body contained in a structure can be estimated.

  According to the present invention, it is possible to effectively suppress the influence of magnetic disturbance at a low cost.

It is a block diagram which shows the structure of the magnetic disturbance suppression assistance apparatus which concerns on embodiment. It is a schematic diagram which shows the structure of HDD which concerns on embodiment. It is a perspective view which shows an example of the state which the magnetic disturbance has generate | occur | produced by the influence of the structure containing a magnetic body. It is a flowchart which shows the flow of a process of the disturbance suppression assistance process program which concerns on 1st Embodiment. It is a top view which shows an example of the deviation distribution of geomagnetism in case the structure containing a magnetic body does not exist. It is a top view which shows an example of the deflection distribution of geomagnetism in the case where the structure containing a magnetic body exists. It is a top view which shows an example of geomagnetic distribution in case the structure containing a magnetic body exists. It is a front view which shows an example of the input screen which concerns on 1st Embodiment. It is a systematic diagram which shows an example of the restriction | limiting of the arrangement position of the magnetic body which concerns on 1st Embodiment. It is a top view which shows an example of the declination distribution of geomagnetism at the time of arrange | positioning the magnetic body which suppresses a magnetic disturbance. It is a top view which shows another example of the deflection distribution of geomagnetism at the time of arrange | positioning the magnetic body which suppresses magnetic disturbance. It is a top view which shows another example of the deflection distribution of geomagnetism at the time of arrange | positioning the magnetic body which suppresses magnetic disturbance. It is a flowchart which shows the flow of a process of the disturbance suppression assistance process program which concerns on 2nd Embodiment. It is a front view which shows an example of the input screen which concerns on 2nd Embodiment. It is a front view which shows an example of the input screen which concerns on 2nd Embodiment.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In the present embodiment, the present invention is applied to a magnetic disturbance suppression support device that supports suppression of magnetic disturbance in an area for calibrating an aircraft compass on an airfield (hereinafter referred to as “target area”). This will be described as an example. Further, in the present embodiment, the entire area of the airfield is an area that can be dealt with in order to suppress magnetic disturbance in the target area (hereinafter referred to as “a dealable area”). In the present embodiment, it is assumed that the addressable area is an area including the target area.
<First Embodiment>
First, the configuration of the magnetic disturbance suppression support device 10 (hereinafter simply referred to as “support device 10”) according to the first embodiment will be described in detail with reference to FIG.

  The support apparatus 10 according to the present embodiment includes a CPU (Central Processing Unit) 12 that comprehensively controls the support apparatus 10. The support device 10 stores a RAM (Random Access Memory) 14 that is a work area when the CPU 12 executes various processes, and a control program and various data used when the CPU 12 executes various processes. A ROM (Read Only Memory) 16 is provided. Further, the support device 10 includes an HDD (Hard Disk Drive) 18 that functions as a storage unit that stores various data used when the CPU 12 performs processing and various information input by a user operation.

  Further, the support apparatus 10 includes an I / F (interface) 20 for exchanging information with an external apparatus. Further, the support device 10 includes an input device 22 such as a keyboard and a mouse for inputting information designated by a user operation, and a display device 24 such as an LCD (Liquid Crystal Display) for displaying various information under the control of the CPU 12. Yes.

  The CPU 12, RAM 14, ROM 16, HDD 18, I / F 20, input device 22, and display device 24 are connected to each other by a bus including a data bus. In addition, the assistance apparatus 10 can acquire the measured value of the geomagnetism measured by the magnetic measurement apparatus (not shown) via the I / F 20.

  As shown in FIG. 2, the HDD 18 according to the present embodiment has a database area 18 a for storing various information and a program area 18 b for storing various control programs including a disturbance suppression support processing program described later. Yes.

  By the way, normally, an azimuth meter provided in an aircraft or the like indicates north (magnetic north) due to the influence of geomagnetism. However, when there is a structure including a magnetic material such as a reinforcing bar or steel frame around the compass, as shown in FIG. 3 (1) as an example, the direction of geomagnetism is affected by the magnetic material. The magnetic disturbance is generated around the structure. As a result, the direction of geomagnetism may be distorted and the compass may not indicate north. In this case, the geomagnetic declination in the target area becomes non-uniform, and the azimuth meter cannot be calibrated. Therefore, the geomagnetic declination in the target area needs to be kept substantially uniform.

  Here, as shown in FIG. 3 (2), the magnetic material is applied to the region where the magnetic disturbance is generated due to the influence of the structure including the magnetic material and the declination angle of the geomagnetism is nonuniform. It is possible to maintain the uniformity of the geomagnetic declination by arranging in an arrangement state that can cancel out.

  Therefore, the support apparatus 10 according to the present embodiment suppresses the disturbance that derives the number of magnetic bodies that can cancel the magnetic disturbance in the target region, the arrangement position of the magnetic bodies, and the amount of the magnetic bodies that are arranged at the arrangement positions. Perform support processing. Thereby, the support device 10 supports suppression of magnetic disturbance in the target region. In this embodiment, a cylindrical iron pipe is used as the magnetic body. However, the shape and material of the magnetic body are not limited to iron or cylindrical. That is, the shape of the magnetic body is arbitrary, and the material of the magnetic body may be any magnetic body such as iron, cobalt, nickel, ferrite, and the like.

  In the database area 18a according to the present embodiment, the geomagnetic information area 18c for storing geomagnetic information indicating the geomagnetic distribution in the manageable area and the structure information that is information regarding the structure existing in the manageable area are stored. A structure information area 18d to be stored is included. In addition, the geomagnetism information indicates the geomagnetism distribution in which the magnitude and direction of the geomagnetism are shown in association with a plurality of predetermined points (hereinafter referred to as “target points”) in the area including the coping area. Information. The geomagnetic distribution indicated by the geomagnetic information is a geomagnetic distribution that does not take into account the influence of the magnetic body on the structure having the magnetic body.

  Next, with reference to FIG. 4, the operation of the support device 10 at the time of executing the disturbance suppression support process will be described. FIG. 3 is a flowchart showing a process flow of a disturbance suppression support processing program executed by the CPU 12 when an operation for instructing execution of the disturbance suppression support process is performed by the user via the input device 22. . The program is stored in advance in the program area 18 b of the HDD 18.

  First, in step S101, the geomagnetic information is acquired by reading from the geomagnetic information area 18c of the HDD 18. Thus, in the present embodiment, the geomagnetic information is acquired by reading the geomagnetic information stored in advance in the support device 10 itself, but the present invention is not limited to this. The method for acquiring geomagnetic information may be, for example, a method in which the support apparatus 10 is connected to a network such as the Internet and downloaded from a server apparatus or the like connected to the network. For example, a “magnetic declination list” published by the Geospatial Information Authority of Japan, and measurement values of geomagnetism at a plurality of predetermined points published by the Geographical Survey Institute may be used.

  As an example, as shown in FIG. 5, this geomagnetism distribution is represented by a vector in which the direction of geomagnetism corresponds to the direction and the magnitude of geomagnetism corresponds to the length at each target point in the coping area 26. As shown in FIG. 5, in the region where no magnetic disturbance occurs, the direction of geomagnetism is substantially uniform throughout the coping area 26. In addition, since FIG. 5 is a top view, although the inclination angle with respect to the horizontal direction of geomagnetism is abbreviate | omitted, in fact, the direction of geomagnetism is inclined also about the horizontal direction.

  In addition, instead of obtaining the magnetic declination list and the measurement value of the geomagnetism, the geomagnetic distribution is calculated using the “approximate equation representing the standard geomagnetic distribution in the Japanese archipelago” published by the Geospatial Information Authority of Japan. It may be derived. Specifically, the magnitude and direction of the geomagnetism at each target point are obtained by substituting the latitude and longitude at each target point in the addressable area 26 into this approximate expression, and the magnitude of each target point and the geomagnetism. The geomagnetic distribution may be generated in association with the orientation.

  In the next step S103, it is determined whether or not structure information (hereinafter referred to as “magnetic material information”) relating to the structure including the magnetic material is stored in the structure information area 18d of the HDD 18.

  When an affirmative determination is made in step S103, the process proceeds to step S105, where the magnetic material information is read out, and the amount of the magnetic material present in the structure using the amount of reinforcing bars and steel frames indicated by the read magnetic material information. Is derived, and the process proceeds to step S111 described later. In this embodiment, CPU12 extracts members, such as a framework containing a magnetic body, a pillar, and a wall, from each member shown by structure information, and the quantity of the magnetic body contained in the extracted member for every structure. The amount of the magnetic material is derived by adding up to. At this time, the installation position and the amount of the magnetic material are derived for each extracted member, and the amount of the magnetic material for each region obtained by subdividing the addressable region 26 from the installation position and the amount of the magnetic material for each member. May be derived.

  On the other hand, when a negative determination is made in step S103, the process proceeds to step S107, and information indicating the measured values of the magnitude and direction of geomagnetism at each target point in the dealable area 26 is acquired. At this time, the CPU 12 includes a peripheral region of the structure measured by a magnetic measurement device such as a three-axis fluxgate magnetometer or an FT-type magnet (fluxgate / magnetometer / theodolite) via the I / F 20. The geomagnetic distribution in the region is acquired from the magnetic measurement device. In the present embodiment, the magnetic measurement device stores information indicating the measured value at each target point together with information indicating the measured position, and the support device 10 supports the information wirelessly or by wire in response to a request. 10 is provided. At this time, it is desirable that the area to be measured is wider, and it is particularly desirable that the area to be measured coincides with the manageable area 26. However, for example, when it is difficult to set the entire area of the manageable area 26 as a measurement target, it is preferable to match the measurement target area with the target area 28.

  Note that the method for acquiring the information indicating the measurement value is not limited to this, and the information indicating the measurement value measured in advance by the magnetic measurement device is stored in advance in the database area 18a of the HDD 18 together with the information indicating the measured position. The information may be acquired by reading from the HDD 18.

  In the next step S109, based on the acquired geomagnetic information and the information indicating the acquired measurement value, after estimating the amount of the magnetic material included in the structure existing in the coping area 26, step S111 described later is performed. Migrate to At this time, the CPU 12 estimates the amount of magnetic material of the structure by a method such as a three-dimensional magnetic field analysis by a finite element method (FEM) so that the measured value and the declination distribution of the geomagnetism coincide.

  In the next step S111, based on the geomagnetic information acquired in step S101, the amount of magnetic material derived in step S105 or the amount of magnetic material estimated in step S109, and the position of the structure, The declination distribution of the geomagnetism that takes into account the magnetic disturbance generated by computer simulation is derived by computer simulation (hereinafter simply referred to as “simulation”). In this case, as a technique for performing FEM analysis within the range of realistic calculation costs, for example, the document “Magnetic Field Analyzes of Architectural Components Using Homogenization Technique, S. Odawara, Y. Haraguchi, K. Muramatsu, K. Yamazaki, Conventionally known methods such as the technique described in “S. Hirosato, IEEE TRANSACTIONS ON MAGNETICS, vol. 46, no. 8 (2010)” can be used.

  In addition, FEM analysis model is created using the method of the above literature, geomagnetic information is given as a uniform magnetic field, and simulation is performed by side element FEM by A-φ method which performs magnetic field analysis using magnetic vector potential and electric scalar potential. Do.

The basic equation of the A-φ method is shown in the following equation (1). A is the magnetic vector potential, J ₀ is the forced current density, and ν is the magnetic resistivity of the magnetic material. The magnetic field analysis is performed by discretizing the equation (1) by a weighted residual method such as the Galerkin method and solving the derived simultaneous linear equations by the ICCG method (a conjoint gradient method with incomplete Cholesky decomposition) or the like.

The CPU 12 calculates magnetic field analysis software (for example, ANSYS, Inc.) based on the direction and size of the geomagnetism calculated from the amount of the magnetic material included in the structure 29 existing in the manageable area 26 according to the above equation (1). Simulation by Maxwell (registered trademark)). Then, as a result of the simulation, the CPU 12 derives a geomagnetic declination distribution in which the magnetic disturbance in the coping area 26 is taken into account.

  The simulation method is not limited to the above-described software method, and the magnetic field analysis may be performed by another conventionally known method.

  If the region to be measured in step S109 coincides with the manageable region 26, the processing in step S111 is omitted, and the declination distribution derived by the simulation is added to the geomagnetic declination distribution indicated by the measurement value. May be replaced. Further, when the geomagnetism measurement is performed in a part of the handleable area 26 such as the peripheral area of the structure, the entire analysis area of the handleable area 26 is expanded by extending the simulation analysis area to the target area 28. The geomagnetic declination distribution may be derived in consideration of the disturbance in

  As described above, in the geomagnetic declination distribution in the case where the structure 29 including the magnetic material is present in the coping area 26, the direction of the geomagnetism in the peripheral area of the structure 29 is affected by the structure 29. Bent against the magnetic north of. For this reason, as shown in FIG. 6 as an example, the geomagnetic declination angle in the coping area 26 is non-uniform.

  In this embodiment, the geomagnetic declination distribution is derived in step S111. However, the present invention is not limited to this, and the geomagnetic distribution may be derived instead of the declination distribution. In the geomagnetic distribution, as shown in FIG. 7 as an example, the strength of the magnetic field at each target point is expressed in a different mode (for example, color, dot pattern, etc.) for each predetermined range. According to FIG. 7, due to the influence of the structure 29 including the magnetic material, the magnetic field in the peripheral region of the structure 29 is stronger than the other regions, and the strength of the magnetic field inside the target region 28 is non-uniform. You can see that

  In the next step S115, information indicating the cost (expense) limitation when suppressing the magnetic disturbance and information indicating the limitation of the magnetic influence outside the addressable area 26 are acquired. As shown in Table 1 below, in this embodiment, regarding the cost limitation, an upper limit value is provided for the number and amount of magnetic materials, but there is no limitation on the arrangement position of the magnetic materials. In the present embodiment, regarding the restriction of the magnetic influence outside the addressable area 26, there is no restriction on the number, amount, and arrangement position of the magnetic bodies.

As described above, in this embodiment, the upper limit is set for the number of magnetic bodies according to the cost limit. However, the present invention is not limited to this, and a limit may be set for the material of the magnetic body. May be provided.

  In the present embodiment, the CPU 12 performs control to display the input screen 30 as shown in FIG. 8 on the display device 24 as an example when acquiring the information indicating the above-described restrictions, and the information input according to the input screen 30 is displayed. get. The input screen 30 according to the present embodiment includes a cost restriction input field 32 for inputting a cost restriction, a magnetic influence input field 34 for inputting a magnetic influence restriction outside the coping area 26, and each input field. An input completion button 36 for instructing completion of input is provided. The user inputs information into each input field using the input device 22 and then selects the input completion button 36. When the input completion button 36 is selected, the CPU 12 acquires the information input in the cost limit input field 32 as information indicating the cost limit, and the information input in the magnetic influence input field 34 can be handled. 26 is obtained as information indicating the restriction of the magnetic influence to the outside.

  However, the method for obtaining information indicating the limitation of the cost when suppressing the magnetic disturbance and the information indicating the limitation of the magnetic influence outside the coping area 26 is not limited to such an input via the input screen. For example, when each information is stored in the database area 18 a of the HDD 18, the information may be acquired from the HDD 18.

  In this case, it is not always necessary to obtain both the cost restriction and the magnetic influence restriction outside the addressable area 26, and only one of these may be obtained. It is good also as a form which does not acquire. If neither is acquired, the process of step S111 is performed, and then the process proceeds to step S117 without performing the process of step S115.

  In the next step S117, information indicating the restriction on the arrangement position of the magnetic body when suppressing the magnetic disturbance is acquired. In the present embodiment, the arrangement position of the magnetic body at each point in the manageable area 26 is limited using map information, structure information, and the like including position information of the runway and the building in the manageable area 26. To decide.

  As an example, as shown in FIG. 9, at this time, the CPU 12 determines the restriction of the arrangement position separately in the target area 28 and outside the target area 28. In the example shown in FIG. 9, the sky and the ground cannot be arranged on the passage or the runway in the target area 28. Further, the entire area cannot be arranged around the magnetic equipment in the target area 28. Furthermore, the basement cannot be arranged in the rooftop space in the target area 28.

  On the other hand, in the used land and the building / structure outside the target area 28, the sky and the ground cannot be arranged. In addition, the underground cannot be arranged in an area outside the target area 28 where there are underground pipes and the like. Further, in the unused land outside the target area 28, the entire area can be arranged. Further, outside the coping area 26, the entire area cannot be arranged.

  However, the method for acquiring information indicating the restriction of the arrangement position of the magnetic body when suppressing the magnetic disturbance is not limited to this. For example, when the information is stored in advance in the database area 18 a of the HDD 18, the information may be acquired from the HDD 18, or the information input by the user via the input device 22 may be acquired.

  Moreover, you may show to a user by displaying the information which shows the restriction | limiting of the arrangement position determined by the process of step S117 on the display apparatus 24. FIG. At this time, when the user wants to correct the displayed information, the user inputs the correction contents using the input device 22. In this case, the CPU 12 corrects the information indicating the restriction of the arrangement position based on the input correction content.

  In the next step S119, the geomagnetic information acquired in step S101, the amount of magnetic material derived in step S105 or the amount of magnetic material estimated in step S109, the position of the structure 29, and the cost acquired in step S115 above. The arrangement state of the magnetic body that can suppress the magnetic disturbance is derived by simulation using the restriction of the magnetic field and the restriction of the magnetic influence outside the coping area 26 and the restriction of the arrangement position determined in step S117.

  First, when the magnetic body is arranged in the manageable area 26, the CPU 12 determines the difference between the maximum value and the minimum value of the geomagnetic declination at each target point in the target area 28 (hereinafter referred to as “maximum angle difference”). ) Is equal to or less than a predetermined threshold value (for example, 0.2 degrees), and an arrangement state (in this embodiment, the number of magnetic bodies, an arrangement position, and an amount) that satisfies the restriction on the arrangement position is derived.

  As a method for deriving the arrangement state of the magnetic body, any conventionally known method can be used. Here, the following first method and second method are exemplified.

  The first method is a method of changing the combination of the number of magnetic materials, the arrangement position, and the amount by trial and error so that the maximum angle difference in the target region 28 is equal to or less than the above threshold value. In this method, the number, the arrangement position, and the amount of magnetic bodies that have a maximum angle difference equal to or smaller than the threshold value and the minimum are determined as the arrangement state. In addition, when there are a plurality of arrangement states in which the maximum angle difference in the target area 28 is equal to or less than the threshold value, a plurality of arrangement states may be determined as candidates for the arrangement state.

  In the second method, after the number of magnetic bodies is determined, the determined number of magnetic bodies is set as a fixed value, and the amount of the magnetic body and coordinates indicating the arrangement position of the magnetic body are used as parameter variables. It is a technique to seek. Specifically, for example, the target value is set such that the maximum angle difference is equal to or less than the threshold value, and the amount and arrangement position of the magnetic material are determined by a direct method. Alternatively, the objective function may be determined by the descending method with the maximum angle difference. In addition, when determining the number of magnetic bodies, the number of magnetic bodies input by the user via the input device 22 may be used, and a plurality of arrangement states are determined as candidates for the arrangement states by the first method. The number of magnetic bodies having the highest frequency may be used.

  Further, the CPU 12 extracts an arrangement state satisfying the cost limitation acquired by the process of step S115 from the derived arrangement state. In the present embodiment, for example, the unit price per unit weight for each magnetic material is stored in advance in the HDD 18. Then, a determination as to whether or not the cost limit is satisfied is derived according to the amount and number of magnetic materials based on the unit price, and it is determined whether or not the derived cost is equal to or less than the upper limit value of the cost. To do. In the present embodiment, the cost may include a labor cost for arranging the magnetic body.

  Further, the CPU 12 extracts an arrangement state satisfying the restriction of the magnetic influence outside the addressable area 26 from the arrangement states satisfying the cost restriction. In the present embodiment, the determination as to whether or not the limit of the magnetic influence to the outside of the manageable area 26 is satisfied, for example, the geomagnetic distribution for the peripheral area adjacent to the outer periphery of the manageable area 26 as in the process of step S111. This is performed by determining whether or not the derived geomagnetic distribution satisfies the restriction of the magnetic influence.

  When a plurality of arrangement states that minimize the maximum angle difference are extracted, it is preferable to extract the arrangement state that has the lowest derived cost. A plurality of arrangement states may be determined as candidates for the arrangement state.

  In this embodiment, after deriving an arrangement state in which the maximum angle difference is equal to or less than the above threshold value, the arrangement state is sequentially narrowed down using a cost limitation and a magnetic influence restriction outside the addressable area 26. Although the state is derived, the method for deriving the arrangement state is not limited to this. For example, after extracting an arrangement state that satisfies the cost restriction, the arrangement state may be narrowed down to an arrangement state that satisfies the restriction of the magnetic influence outside the addressable area 26 and has the maximum angle difference equal to or less than the threshold value. Or after extracting the arrangement | positioning state which satisfy | fills the restriction | limiting of the magnetic influence out of the coping area | region 26, you may narrow down to the arrangement | positioning state which satisfy | fills the restriction | limiting of cost and the maximum angle difference is below the said threshold value.

  In the next step 121, control is performed so that information indicating the derived arrangement state is displayed on the display device 24, and the execution of this program is terminated. In the present embodiment, as illustrated in FIG. 10 as an example, the CPU 12 derives information indicating the derived amount of the derived number of magnetic bodies 40 by superimposing the geomagnetic declination distribution in the addressable area 26. It is displayed so as to correspond to the arranged position. In the present embodiment, the magnetic body 40 is represented by a circular mark, and information indicating the derived amount is displayed corresponding to the area of the mark. However, the display mode is not limited to this, for example, the arrangement of the magnetic body 40 The position may be represented by a point, and the amount of the magnetic material may be displayed numerically in the vicinity of this point. At this time, information indicating the cost when the derived arrangement state is adopted may be displayed together.

  Note that if the arrangement state satisfying all of the maximum angle difference requirement, the cost restriction, the magnetic influence restriction outside the addressable area, and the arrangement position restriction is not derived in step S119, the CPU 12 Control to display information indicating that on the display device 24 is performed.

  Thus, when the support apparatus 10 presents the arrangement state of the magnetic body 40 that can suppress the magnetic field disturbance of the geomagnetism, the user creates the magnetic body 40 with reference to these, and the produced magnetic body 40 is presented. Place in position. Thereby, the magnetic disturbance in the object area | region 28 can be suppressed effectively at low cost.

  In step S121, the CPU 12 may display the geomagnetic distribution instead of the geomagnetic declination distribution. In this case, the CPU 12 displays the information indicating the derived amount for the derived number of magnetic bodies 40 so as to correspond to the derived arrangement position, superimposed on the geomagnetic distribution.

  If the present embodiment can ensure the uniformity of the magnetic field in the adjustment area for calibration of an azimuth meter such as an aircraft, conventionally, construction of a building or the like is not permitted in order to ensure the uniformity of the magnetic field. Buildings can be constructed in and around the adjustment area. In addition, according to the present embodiment, it becomes possible to effectively utilize a space in a limited site. For example, in an aircraft manufacturing facility or an airfield, it is possible to construct an aircraft hangar, equipment warehouse, etc. in the immediate vicinity of the adjustment area of the compass. In research facilities and the like, even a small vacant land surrounded by buildings can be used as a measurement space with a stable magnetic field distribution.

  In the present embodiment, by arranging the number of magnetic bodies 40 according to the declination distribution, a magnetic field that cancels the change in the magnetic field due to the magnetic disturbance is locally created, and the declination of the geomagnetism is made uniform. However, it is not limited to this. For example, as shown in FIG. 11, as an example, by arranging a magnetic body 42 between a structure 29 including a magnetic body and a target area 28, the influence from the structure 29 including a magnetic body is affected. Do not reach 28. In this way, the magnetic influence on the target region 28 by the structure 29 may be shielded, and the geomagnetic declination angle may be made uniform. In this method of uniforming the declination of geomagnetism, the magnetic body 42 for shielding the magnetic influence on the target region 28 by the structure 29 is arranged rather than arranging the number of magnetic bodies 40 corresponding to the declination distribution. This is useful when it is cheaper to do.

In addition, when the amount and the number of magnetic bodies to be arranged are large, or when the number of structures 29 existing in the coping area 26 is large and the declination of geomagnetism varies greatly depending on the position, the entire target area 28 The magnetic body 44 may be installed on the surface. For example, as shown in FIG. 12 as an example, by installing a plate-like magnetic body 44 that covers the entire target region 28 on the ground or underground, the object positioned above the plate-like magnetic body 44 The geomagnetic declination can be made uniform throughout the region 28.
Second Embodiment
Hereinafter, the support device 10 according to the second embodiment will be described in detail. In addition, since the assistance apparatus 10 which concerns on 2nd Embodiment has the structure similar to the assistance apparatus 10 which concerns on the said 1st Embodiment, description is abbreviate | omitted here.

  In the first embodiment, the arrangement state of the magnetic body is derived by simulation based on the geomagnetic declination distribution. On the other hand, in the second embodiment, information indicating the geomagnetic declination distribution is displayed, and the arrangement state of the magnetic material input by the user is received based on the displayed geomagnetic declination distribution.

  Next, with reference to FIG. 13, the operation of the CPU 12 at the time of executing the disturbance suppression support process will be described. FIG. 13 is a flowchart showing a process flow of a disturbance suppression support processing program executed by the CPU 12 when an operation for instructing execution of the disturbance suppression support process is performed by the user via the input device 22. . The program is stored in advance in the program area 18 b of the HDD 18.

  In addition, the same code | symbol is attached | subjected to the step same as each step of the disturbance suppression assistance processing program in 1st Embodiment, and the overlapping description is abbreviate | omitted.

  After performing the processing of steps S101 to S111, the process proceeds to step S201.

  In step S201, control is performed to display the declination distribution derived in step S111 on the display device 24. In the present embodiment, the CPU 12 displays the derived declination distribution and displays an input screen that prompts input of information indicating the arrangement state of the magnetic body on the declination distribution.

  As an example, as shown in FIG. 14, the input screen 50 includes an arrangement position input field 52 for inputting the position of the magnetic material, an amount input field 54 for inputting the amount of the magnetic material, and confirmation of information input in each input field. An input completion button 56 is provided. In addition, the declination distribution is displayed in the arrangement position input field, and the arrangement position input so as to be superimposed on the declination distribution is associated with a position on the declination distribution.

  For each magnetic body to be placed, the user inputs information indicating the placement position into the placement position input field 52 using the input device 22 and inputs the amount of the magnetic body placed at the placement position into the quantity input field 54. Thereafter, the input completion button 56 is selected. When the input completion button 56 is selected, the CPU 12 acquires the information input in the arrangement position input field 52 as information indicating the arrangement position of the magnetic body, and the information input in the quantity input field 54 of the magnetic body. Acquired as information indicating the quantity.

  In the next step S203, the process waits until input of information indicating the arrangement state of the magnetic material is completed and the input completion button 56 is selected, and then the process proceeds to step S205.

  In the next step S205, a declination distribution in a state where the magnetic body is arranged so as to be in the inputted arrangement state is derived. At this time, the CPU 12 takes into account the magnetic disturbance generated due to the magnetic body 29 included in the structure existing in the coping area 26 and the magnetic body arranged to suppress the magnetic disturbance, and the above A declination distribution is derived by the same method as in step S111.

  In the next step S207, it is determined whether or not the maximum angular difference in the derived declination distribution is equal to or smaller than a predetermined threshold (in this embodiment, 0.2 degrees).

  If a negative determination is made in step S207, the process proceeds to step S209, where control is performed to display the declination distribution derived in step S205, and the user is instructed to re-input the arrangement state of the magnetic material, and step S203 is performed. Return to. In the present embodiment, as shown in FIG. 15 as an example, the derived declination distribution is displayed in the arrangement position input field 52, and a reset button 58 for resetting the input arrangement state is displayed on the input screen 50. Display.

  When the user finely adjusts the arrangement state of the magnetic body input last time, the user moves the arrangement position of the magnetic body displayed in the arrangement position input column 52 using the input device 22 or moves the amount input column 54 to the amount input column 54. After changing the amount of the input magnetic material, the input completion button 56 is selected. On the other hand, the user selects the reset button 58 when inputting the arrangement state of the magnetic body from the beginning. When the reset button 58 is selected, the CPU 12 returns the input screen 50 to a state (the state shown in FIG. 13) in which the arrangement state of the magnetic body is not input in each input field, and controls the display device 24 to display it. Do.

  On the other hand, when an affirmative determination is made in step S207, the process proceeds to step S211 to perform control for displaying the arrangement state on the display device 24, and the execution of this program is terminated.

10 Magnetic disturbance suppression support device 12 CPU
22 Input Device 24 Display Device 26 Addressable Area 28 Target Area 29 Structure 40, 42, 44 Magnetic Material

Claims (5)

An acquisition means for acquiring geomagnetic information indicating a state of geomagnetism in a state where there is no structure including a magnetic body in a predetermined region including a space to be subjected to suppression of magnetic disturbance;
An accumulating unit that is provided in the region and accumulates the amount of the magnetic body of the structure including the magnetic body;
Based on the geomagnetic information acquired by the acquisition unit, the integrated amount of the magnetic body integrated by the integration unit, and the position of the structure, the magnetism generated in the region due to the magnetic body of the structure A derivation means for deriving a geomagnetic distribution or a geomagnetic declination distribution in the region by simulating a disturbance;
Based on the geomagnetic distribution or the geomagnetic declination distribution derived by the deriving means, an arrangement position of the magnetic substance arranged in the region so as to suppress magnetic disturbance caused by the magnetic substance of the structure, And a determining means for determining the amount of the magnetic material to be arranged at the arrangement position;
Magnetic disturbance suppression support device equipped with. The determining means, when the terrestrial magnetic distribution is derived by the derivation means, based on the geomagnetic declination of each point indicated by the geomagnetic distribution, and when the declination distribution is derived by the derivation means. Based on the declination distribution, the difference between the maximum and minimum values of the geomagnetic declination at each point in the space to be suppressed falls within a predetermined range, or the space to be suppressed The arrangement position of the magnetic body and the amount of the magnetic body to be arranged at the arrangement position are set so that the difference in the above is within a predetermined range and the total amount of the magnetic bodies to be arranged is not more than a predetermined value. The magnetic disturbance suppression support device according to claim 1 to be determined. The determination means determines an arrangement position of the magnetic body and an amount of the magnetic body to be arranged at the arrangement position so that the magnetic body is arranged in a predetermined second region in the region. The magnetic disturbance suppression support apparatus according to 1 or 2. An acquisition means for acquiring geomagnetic information indicating a state of geomagnetism in a state where there is no structure including a magnetic body in a predetermined region including a space to be subjected to suppression of magnetic disturbance;
An accumulating unit that is provided in the region and accumulates the amount of the magnetic body of the structure including the magnetic body;
Based on the geomagnetic information acquired by the acquisition unit, the integrated amount of the magnetic body integrated by the integration unit, and the position of the structure, magnetism generated in the region due to the magnetic body of the structure Derivation means for deriving the geomagnetic distribution or the declination distribution in the region by simulating the disturbance,
Display means for displaying the geomagnetic distribution or the geomagnetic declination distribution derived by the deriving means;
Receiving means for receiving an input of an arrangement state of the magnetic body arranged in the region in the geomagnetic distribution or the geomagnetic declination distribution displayed by the display means;
The difference between the maximum value and the minimum value of the geomagnetic declination at each point of the space to be suppressed when the magnetic body is arranged according to the arrangement state received by the reception unit is within a predetermined range. Determination means for determining whether or not,
Magnetic disturbance suppression support device equipped with. Computer
An acquisition means for acquiring geomagnetic information indicating a state of geomagnetism in a state where there is no structure including a magnetic body in a predetermined region including a space to be subjected to suppression of magnetic disturbance;
An accumulating unit that is provided in the region and accumulates the amount of the magnetic body of the structure including the magnetic body;
Based on the geomagnetic information acquired by the acquisition unit, the integrated amount of the magnetic body integrated by the integration unit, and the position of the structure, the magnetism generated in the region due to the magnetic body of the structure A derivation means for deriving a geomagnetic distribution or a geomagnetic declination distribution in the region by simulating a disturbance;
Based on the geomagnetic distribution or the geomagnetic declination distribution derived by the deriving means, an arrangement position of the magnetic substance arranged in the region so as to suppress magnetic disturbance caused by the magnetic substance of the structure, And a determining means for determining the amount of the magnetic material to be arranged at the arrangement position;
Program to function as.