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A Calculation Method of Magnetic Resistance of Electromagnetically Launched Projectile

A calculation method and magnetic resistance technology, applied in design optimization/simulation, electrical digital data processing, instruments, etc., can solve the problem of model parameter sensitivity and lack of universality, achieve strong universality, reduce calculation amount of effect

Active Publication Date: 2022-06-21
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the finite element method can obtain the magnetic resistance at each moment, and then calculate the motion state of the projectile, this method is very sensitive to model parameters, and different parameters need to be recalculated, which is not universal

Method used

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  • A Calculation Method of Magnetic Resistance of Electromagnetically Launched Projectile
  • A Calculation Method of Magnetic Resistance of Electromagnetically Launched Projectile
  • A Calculation Method of Magnetic Resistance of Electromagnetically Launched Projectile

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Embodiment 1

[0029] In this example, see Figure 1-Figure 3 , a method for calculating the magnetic resistance of a magnetoresistive electromagnetic launching projectile. After calculating the magnetic induction intensity at each point of the upper bottom surface and the lower bottom surface of the cylindrical projectile, the area of ​​the upper bottom surface and the lower bottom surface is divided to obtain the cylinder at this moment. The magnetic resistance of the body projectile:

[0030]

[0031] where B x , B y , B z are the x-axis component, y-axis component, and z-axis component of the magnetic induction intensity, S 1 , S 2 are the upper and lower bottom surfaces of the cylindrical projectile, respectively, μ 0 is the vacuum permeability.

[0032] This embodiment uses the magnetic induction intensity of the upper and lower bottom surfaces of the projectile to calculate the magnetic resistance, and is applicable to the situation that the magnetic field of the side surface...

Embodiment 2

[0034] This embodiment is basically the same as the first embodiment, and the special features are:

[0035] In this embodiment, the axis of the cylindrical projectile is in the same direction as the z-axis. When F>0, the magnetic resistance of the projectile is determined by S 2 point to S 1 , when F1 point to S 2 . The magnetic field distribution on the side of the cylindrical projectile is centrosymmetric relative to the axis of the cylindrical projectile. The magnetic induction intensity of the upper and lower bottom surfaces is calculated by the finite element method, or calculated by other methods. The calculation method of the magnetic resistance of the magnetoresistive electromagnetic launching projectile in this embodiment is suitable for the calculation of the magnetic resistance of the cylindrical projectile under the static magnetic field and the transient electromagnetic field, which greatly reduces the amount of calculation. It is applicable to all situations...

Embodiment 3

[0037] This embodiment is basically the same as the above-mentioned embodiment, and the special features are:

[0038] The calculation method of the magnetic resistance of the magnetoresistive electromagnetic launching projectile uses the magnetic induction intensity at each point of the upper bottom surface and the lower bottom surface of the cylindrical projectile to calculate, and then divides the area of ​​the upper bottom surface and the lower bottom surface to obtain the cylinder at this moment. Magnetic resistance of the projectile:

[0039]

[0040] where B x , B y , B z are the x-axis component, y-axis component, and z-axis component of the magnetic induction intensity, S 1 , S 2 are the upper and lower bottom surfaces of the cylindrical projectile, respectively, μ 0 is the vacuum permeability.

[0041] like figure 1 Shown is a schematic diagram of a single-stage magnetoresistive electromagnetic launch system. The system consists of projectile 1, launch coi...

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Abstract

The invention discloses a method for calculating the magnetic resistance of a reluctance electromagnetic launch projectile, and provides an analytical expression of the magnetic resistance of a cylindrical projectile under the condition of a symmetrical magnetic field, and only needs to obtain the magnetic field distribution of the upper and lower bottom surfaces of the cylindrical projectile It can calculate the magnetic resistance of the projectile, which can save a lot of computing resources, and can be used for the calculation of magnetic resistance under static magnetic field and transient electromagnetic field. Different from the "virtual work method" which utilizes projectile kinetic energy to reverse magnetic resistance, the calculation method of the present invention uses magnetic field to calculate magnetic resistance, which can then be used to calculate projectile kinetic energy, and provides a reference for establishing a mathematical model of reluctance electromagnetic emission. The invention is applicable to all situations where the magnetic field is center-symmetrical to the cylindrical projectile, and has strong universality.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic propulsion, and is mainly used for calculating the magnetic resistance of the cylindrical projectile at each moment. Background technique [0002] The magnetoresistive electromagnetic launch technology is based on the principle of minimum magnetoresistance. When the magnetic resistance of the system composed of the iron projectile and the launch coil does not reach the minimum, the energized launch coil will exert a magnetoresistive pull on the projectile. The reluctance pull always tends to reduce the transmit coil reluctance. Using the above theory, a magnetoresistive electromagnetic launch system can be constructed. [0003] However, the principle of minimum magnetoresistance cannot explain the physical nature of magnetoresistance, nor can it be directly applied to the calculation of magnetoresistance. Due to the coupling of multiple physical fields in the process of magnetoresistive ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F119/14
CPCG06F30/20G06F2119/14
Inventor 陈息坤朱国庆
Owner SHANGHAI UNIV