Design method of electromagnetic decoy using magnets to simulate the magnetic characteristics of submarines

Abstract

This invention discloses a method for designing an electromagnetic decoy that uses magnets to simulate the magnetic characteristics of submarines. Specifically, it relates to a method for providing a simulated magnetic field by adjusting the angle of the magnets. The magnetic decoy comprises N magnets for providing a magnetic field. The design method includes: given a design objective function, constraining the magnet design variables, and utilizing an optimization algorithm to determine the magnet structural parameters, the spatial scale of the multiple magnets, and the arrangement angle. The magnetic decoy optimization design method provided by this invention has the advantages of reducing the mass and volume of the decoy and having high feasibility for engineering applications.

Description

Technical Field

[0001] The invention relates to a method for designing an electromagnetic bait by utilizing a magnet to simulate the magnetic characteristics of a submarine. Background Art

[0002] Submarines are primarily constructed of steel. During extended underwater travel, they generate magnetic signatures that cause variations in the Earth's magnetic field, generating magnetic anomaly signals. These signals are crucial for identifying and revealing submarines. Anti-submarine aircraft equipped with highly sensitive magnetic detectors can detect submarines operating underwater from altitudes of hundreds of meters and precisely locate them, significantly reducing their stealth capabilities.

[0003] Currently, the magnetic detectors carried by advanced anti-submarine aircraft, both domestically and internationally, are scalar magnetometers that measure the total magnetic field. For magnetic detection by anti-submarine aircraft, several research institutions have explored underwater magnetic decoys that mimic submarine magnetic signatures. Existing design methods primarily employ dual electrodes, permanent magnets, long wires, and current-carrying circular coils. However, these methods suffer from large dimensions and mass, making them difficult to implement in engineering practice.

[0004] Based on the above reasons, there is an urgent need for a new magnetic bait design method. The bait designed using this method has a smaller volume and weight, a wider magnetic field coverage range and greater intensity, and can effectively simulate the magnetic characteristics of submarines. Summary of the Invention

[0005] The present invention provides a method for designing an electromagnetic decoy that uses magnets to simulate the magnetic characteristics of a submarine. The decoy is used to simulate the magnetic characteristics generated during the submarine's navigation process. The design method includes: giving a design objective function, constraining the magnet design variables, and using an optimization algorithm to solve the magnet structure parameters, the spatial scale of multiple magnets, and the arrangement angle.

[0006] The magnetic bait designed by the magnetic bait design method using magnets to simulate the magnetic characteristics of submarines provided by the present invention has the advantages of high precision, small size, light weight, and extremely high engineering feasibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments are briefly introduced below.

[0008] Figure 1 The internal structure of the magnetic bait and the angled placement diagram, where P sub is the submarine magnetic moment, P i is the magnetic moment of the i-th magnet.

[0009] Figure 2 、 Figure 3 Schematic diagram of magnetic bait operation. Among them: Figure 2It is the process of taking anti-submarine measures after anti-submarine aircraft locates the submarine through magnetic anomaly detection technology; Figure 3 It is the process in which a submarine drops a magnetic decoy bomb and quickly escapes when it detects an anti-submarine aircraft in the air, using the magnetic decoy bomb to lure the anti-submarine aircraft. DETAILED DESCRIPTION

[0010] There are a certain number of magnets distributed inside the magnetic bait bullet. Each magnet is placed at a certain angle, and a safe distance is left between the magnets. Figure 1 The internal structure of the magnetic bait and the magnets placed at an angle are shown. The radius of the space where the magnetic bait is located is defined as r, the length is L, and the number of magnets is N; the parameters of the i-th magnet include: volume V i , the magnetic moment is P i , the angle between the magnetic moment and the submarine magnetic moment is α i By combining the structural parameters of the magnets, with the total volume of the multiple magnets as the objective function and the magnetic field strength, magnetic moment, and tilt angle as constraints, an algorithm is used to optimize the objective function with these constraints. The optimal solution is the optimal design parameter for each magnet. To explore the design principles for multiple magnet parameters, the objective function and constraints must be determined.

[0011] When determining the parameters of the magnet, one of the volume (mass) and strip length is generally used as the optimization objective function. However, due to the limited space of the decoy projectile, the minimum volume is used as the objective function in this paper in combination with engineering practice. The design is based on the following formula:

[0012] Before solving the objective function, constraints must be added to ensure that the effect produced by the magnet meets the design requirements. The specific constraints are as follows:

[0013] (1) The magnetic moment of multiple magnets is constrained so that the magnetic moment generated by the multiple magnets is roughly equal to the magnetic moment of the submarine. Where ε1 (a value between 0 and 1 depending on the effect requirements) is the error;

[0014] (2) Constraints on the multi-point magnetic field strength. The submarine space magnetic field model is sampled multiple times to meet the following calculation formula:

[0015] Where ε2 (a value between 0 and 1 is taken according to the effect requirement) is the error, B sub is the magnetic induction intensity value of the submarine at the sampling point, B i is the magnetic induction intensity value generated by the i-th magnet at the sampling point;

[0016] (3) Total volume of multiple magnets.

[0017] The above formula is solved using an optimization algorithm. The design is now complete, yielding the optimal solution for each magnet design parameter. The magnetic lure designed in this invention boasts high precision, compact size, and lightweight design. Furthermore, the closed-loop operation of multiple magnets eliminates the need for current maintenance and stability, eliminating the need for a power supply and demonstrating high engineering feasibility.

[0018] In one embodiment, a number of superconducting magnets are distributed within the magnetic decoy projectile, each positioned at a specific angle and with a safe distance between them. Superconducting materials offer the advantages of zero resistance and high current carrying capacity, reducing the volume and weight of the wound magnet material. Superconducting magnets also operate in a closed loop, eliminating the need for a power source and reducing weight.

[0019] The following is a detailed introduction to the design method of a magnetic decoy composed of superconducting magnets. The radius of the space where the magnetic decoy is located is defined as r, the length is defined as L, the number of superconducting magnets is defined as N, and the design parameters of the i-th magnet include: volume V i , number of turns n i , current I i , inner diameter R 1i , outer diameter R 2i , number of layers R 2i , tilt angle α i The width of the superconducting tape selected is d and the thickness is h.

[0020] When determining the parameters of superconducting magnets, one of the volume (mass) and strip length is generally used as the optimization objective function. However, due to the limited space of the decoy projectile, the minimum volume is used as the objective function in this paper in combination with engineering practice. The design is based on the following formula:

[0021] Before solving the objective function, constraints must be added to ensure that the effect produced by the magnet meets the design requirements. The specific constraints are as follows:

[0022] (1) The magnetic moment of multiple magnets is constrained so that the magnetic moment generated by the multiple magnets is roughly equal to the magnetic moment of the submarine.

[0023] Where ε1 is the error (a value between 0 and 1 is taken according to the effect requirements);

[0024] (2) Constraints on the multi-point magnetic field strength. The submarine space magnetic field model is sampled multiple times to meet the following calculation formula:

[0025] Where ε2 is the error (a value between 0 and 1 is taken according to the effect requirements), B sub is the magnetic induction intensity value of the submarine at the sampling point, B i is the magnetic induction intensity value generated by the i-th magnet at the sampling point;

[0026] (3) The total volume of multiple magnets.

[0027] The above formula is solved using the optimization algorithm. At this point, the design is complete and the optimal solution for each magnet design parameter can be obtained.

[0028] Figure 2 、 Figure 3 A diagram of magnetic bait operations was displayed.

[0029] ① The process of anti-submarine aircraft using magnetic detection technology to locate submarines;

[0030] ② The process by which anti-submarine aircraft transmit submarine position information to torpedo carriers and take anti-submarine measures;

[0031] ③ The process in which our submarine, after detecting an anti-submarine aircraft, drops a magnetic decoy and quickly escapes to a safe area;

[0032] ④ The process of magnetic decoys interfering with the anti-submarine aircraft’s mislocalization of the submarine’s position;

[0033] ⑤ The process of transmitting the position information of the magnetic decoy bomb to the torpedo carrier ship for the anti-submarine aircraft;

[0034] ⑥ The process of the torpedo carrier ship's anti-submarine measures implementing an erroneous attack.

Claims

1. A method for designing an electromagnetic decoy using a magnet to simulate the magnetic characteristics of a submarine, characterized in that: There are N magnets distributed inside the electromagnetic bait. Each magnet is placed at a specific angle. The radius of the space where the electromagnetic bait is located is defined as r, the length is L, and the number of magnets is N. The parameters of the i-th magnet include: volume V i , the magnetic moment is P i , the angle between the magnetic moment and the submarine magnetic moment is α i ; The minimum volume of the magnetic bait is taken as the objective function, and the objective function is: The constraints are: The magnetic moment constraint of multiple magnets makes the magnetic moment generated by multiple magnets roughly equal to the magnetic moment of the submarine. Where ε1 is the error; For the multi-point magnetic field intensity constraint, the submarine space magnetic field model is sampled multiple times to satisfy the following calculation formula: Where ε2 is the error, B sub is the magnetic induction intensity value of the submarine at the sampling point, B i is the magnetic induction intensity value generated by the i-th magnet at the sampling point; Total volume constraint of multiple magnets, The optimization algorithm is used to solve the problem and obtain the optimal solution of each magnet design parameter.

2. A method for designing an electromagnetic decoy using a magnet to simulate the magnetic characteristics of a submarine, characterized in that: There are N superconducting magnets distributed inside the electromagnetic bait. Each superconducting magnet is placed at a specific angle. The radius of the space where the electromagnetic bait is located is defined as r, the length is L, and the number of superconducting magnets is N. The design parameters of the i-th superconducting magnet include: volume V i , number of turns n i , current I i , inner diameter R 1i , outer diameter R 2i , number of layers R 2i , tilt angle α i , the selected superconducting tape width is d; the design method includes: The objective function is to minimize the volume of electromagnetic bait, which is: The constraints are: The magnetic moment constraint of multiple magnets makes the magnetic moment generated by multiple magnets roughly equal to the magnetic moment of the submarine. Where ε1 is the error; For the multi-point magnetic field intensity constraint, the submarine space magnetic field model is sampled multiple times to satisfy the following calculation formula: Where ε2 is the error, B sub is the magnetic induction intensity value of the submarine at the sampling point, B i is the magnetic induction intensity value generated by the i-th magnet at the sampling point; Total volume constraint of multiple magnets, The optimization algorithm is used to solve the problem and obtain the optimal solution of each magnet design parameter.

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