阅读说明：本技术 一种非对称舰船磁场垂直分量补偿方法 (Asymmetric ship magnetic field vertical component compensation method ) 是由 宋新昌 孙晓君 张炜 邵成 赵治平 唐宗勇 于 2020-12-29 设计创作，主要内容包括：本发明公开了一种非对称舰船磁场垂直分量补偿方法,首先对在同一纬度区域航行的非对称舰船垂向磁场分量进行分解,克服了传统“对称船”假设法分解时导致：1)龙骨下的Ziy、Zpy等于零,左右舷下Ziy、Zpy互为相反数；2)龙骨下和舷下的Zpx艏艉相反,左右舷下Zix、Zpx相等的弊端,具有操作简单,分解结果合理可信的效果,最终提高磁场补偿的准确性。(The invention discloses a method for compensating vertical components of an asymmetric ship magnetic field, which decomposes the vertical magnetic field components of the asymmetric ship sailing in the same latitude area, and overcomes the defects that the decomposition of the traditional 'symmetric ship' hypothesis method causes: 1) ziy and Zpy under the keel are equal to zero, and Ziy and Zpy under the port and starboard are opposite numbers; 2) zpx under the keel and the side are opposite to each other in fore and aft, and Zix and Zpx under the port and the starboard are equal to each other, so that the method has the effects of simple operation and reasonable and credible decomposition results, and finally improves the accuracy of magnetic field compensation.)

1. A method for compensating the vertical component of the magnetic field of an asymmetric ship is characterized by comprising the following steps:

the method comprises the steps of firstly, measuring to obtain the vertical component of an original magnetic field of a ship, and measuring the original magnetic field of the ship on four main courses of east, south, west and north of the ship under the same water depth; the asymmetric ship magnetic field vertical component Bz is decomposed into three parts on the whole, Zp is a fixed magnetic field vertical component, Zix is a longitudinal induction magnetic field vertical component, wherein the north heading is Zix, and the south heading is-Zix; ziy is the vertical component of the transverse induction magnetic field, with an east heading of Ziy and a west heading of-Ziy;

step two, finding out the vertical components of the original magnetic fields below a port, a keel and a starboard at the same longitudinal distance upward from the magnetic east navigation, respectively arranging the vertical components into a line according to the sequence from the ship bow to the ship stern, and the like:

and step six, after the decomposition of the vertical component of the magnetic field of the ship is finished, comprehensively considering the X, Y, Z directional winding and simultaneously compensating the vertical component of the fixed magnetic field in the ampere-turn number adjustment process of the degaussing winding, compensating the vertical component of the longitudinal induced magnetic field by using the X directional winding, and compensating the vertical component of the transverse induced magnetic field by using the Y directional winding.

2. The method for compensating for the vertical component of the asymmetric ship magnetic field according to claim 1, wherein in the second step, specifically:

magnetic east navigation direction:

wherein the content of the first and second substances,representing the vertical component, Z, of the port magnetic east-navigation field_p(z)Vertical component of fixed magnetic field, Z, port_iy(z)Representing a port side transverse induced magnetic field component;representing the vertical component, Z, of the keel magnetic east-navigation field_p(l)Indicating the magnetic vertical component, Z, of the fixed magnetic field of the keel_iy(l)Representing the transverse induction field component of the keel;represents the vertical component of the starboard magnetic east-navigation magnetic field; z_p(y)Representing the magnetic vertical component, Z, of the starboard fixed magnetic field_iy(y)Representing the starboard transverse induced magnetic field component;

magnetic south course:

wherein the content of the first and second substances,representing the vertical component of the port-side magnetic south course field, Z_ix(z)Representing the vertical component of the port side longitudinally induced magnetic field,representing the vertical component, Z, of the keel flux south course field_ix(l)Showing the vertical component of the longitudinal induced magnetic field of the keel,representing the vertical component of the starboard magnetic south course field, Z_ix(y)Represents the starboard longitudinal induced magnetic field vertical component;

magnetic western navigation direction:

wherein the content of the first and second substances,representing the vertical component of the port magnetic western-course field, Z_iy(z)Representing the port side transverse induced magnetic field vertical component,representing the vertical component, Z, of the magnetic field of the keel in the western direction_iy(l)Showing the vertical component of the magnetic field induced transversely to the keel,representing the vertical component of the starboard magnetic western-course field, Z_iy(y)Represents the starboard transverse induced magnetic field vertical component;

magnetic north heading:

wherein the content of the first and second substances,representing the vertical component, Z, of the port side magneto-north heading magnetic field_ix(z)Representing the vertical component of the port side longitudinally induced magnetic field,representing the vertical component, Z, of the keel flux north heading magnetic field_ix(l)Showing the vertical component of the longitudinal induced magnetic field of the keel,representing the vertical component of the starboard magneto-north heading field, Z_ix(y)Showing the starboard longitudinal induced magnetic field vertical component.

3. The method of claim 2, further comprising: step three, respectively calculating the vertical components of the fixed magnetic fields below the port, keel and starboard according to the formulas (1) to (12):

4. the method of claim 3, further comprising: step four, respectively solving vertical components of longitudinal induction magnetic fields below a magnetic north course port, keel and starboard:

5. the method of claim 4, further comprising: step five, respectively solving the vertical components of the transverse induction magnetic field below the magnetic east-navigation port, keel and starboard:

Technical Field

The invention belongs to the technical field of ship demagnetization, and particularly relates to a vertical component compensation method for an asymmetric ship magnetic field, which is suitable for the vertical component decomposition and the magnetic field compensation of an unshaped asymmetric ship, a submarine and an underwater navigation body and has the characteristics of simple calculation and high calculation result precision.

Background

During degaussing, generally speaking, when the vertical component of the magnetic field of the ship is reduced, the horizontal component is correspondingly reduced. At present, in the degaussing service, the horizontal component of ships, submarines and underwater navigation bodies in seawater is difficult to orient and maintain the horizontal component. So there is a greater chance in practical applications to use the concept of the vertical component. The vertical component of the magnetic field of the ship consists of three parts, namely a vertical component of a longitudinal magnetic field of the ship, a vertical component of a transverse magnetic field of the ship and a vertical component of a vertical magnetic field of the ship, wherein each part is synthesized by a fixed magnetic field and an induction magnetic field, as shown in figure 1: the fixed magnetic field is constant and the induced magnetic field varies according to different course and location.

Disclosure of Invention

In view of this, the present invention provides a method for compensating the vertical component of the magnetic field of an asymmetric ship, so as to improve the compensation accuracy.

A method for compensating vertical components of an asymmetric ship magnetic field comprises the following steps:

the method comprises the steps of firstly, measuring to obtain the vertical component of an original magnetic field of a ship, and measuring the original magnetic field of the ship on four main courses of east, south, west and north of the ship under the same water depth; the asymmetric ship magnetic field vertical component Bz is decomposed into three parts on the whole, Zp is a fixed magnetic field vertical component, Zix is a longitudinal induction magnetic field vertical component, wherein the north heading is Zix, and the south heading is-Zix; ziy is the vertical component of the transverse induction magnetic field, with an east heading of Ziy and a west heading of-Ziy;

step two, finding out the vertical components of the original magnetic fields below a port, a keel and a starboard at the same longitudinal distance upward from the magnetic east navigation, respectively arranging the vertical components into a line according to the sequence from the ship bow to the ship stern, and the like:

magnetic east navigation direction:

wherein the content of the first and second substances,representing the vertical component, Z, of the port magnetic east-navigation field_p(z)Vertical component of fixed magnetic field, Z, port_iy(z)Representing a port side transverse induced magnetic field component;representing the vertical component, Z, of the keel magnetic east-navigation field_p(l)Indicating the magnetic vertical component, Z, of the fixed magnetic field of the keel_iy(l)Representing the transverse induction field component of the keel;represents the vertical component of the starboard magnetic east-navigation magnetic field; z_p(y)Representing the magnetic vertical component, Z, of the starboard fixed magnetic field_iy(y)Representing the starboard transverse induced magnetic field component;

magnetic south course:

wherein the content of the first and second substances,representing the vertical component of the port-side magnetic south course field, Z_ix(z)Represents the left sideThe vertical component of the magnetic field is induced in the longitudinal direction of the ship board,representing the vertical component, Z, of the keel flux south course field_ix(l)Showing the vertical component of the longitudinal induced magnetic field of the keel,representing the vertical component of the starboard magnetic south course field, Z_ix(y)Represents the starboard longitudinal induced magnetic field vertical component;

magnetic western navigation direction:

wherein the content of the first and second substances,representing the vertical component of the port magnetic western-course field, Z_iy(z)Representing the port side transverse induced magnetic field vertical component,representing the vertical component, Z, of the magnetic field of the keel in the western direction_iy(l)Showing the vertical component of the magnetic field induced transversely to the keel,representing the vertical component of the starboard magnetic western-course field, Z_iy(y)Represents the starboard transverse induced magnetic field vertical component;

magnetic north heading:

wherein the content of the first and second substances,representing the vertical component, Z, of the port side magneto-north heading magnetic field_ix(z)Representing the vertical component of the port side longitudinally induced magnetic field,representing the vertical component, Z, of the keel flux north heading magnetic field_ix(l)Showing the vertical component of the longitudinal induced magnetic field of the keel,representing the vertical component of the starboard magneto-north heading field, Z_ix(y)Represents the starboard longitudinal induced magnetic field vertical component;

step three, respectively calculating the vertical components of the fixed magnetic fields below the port, keel and starboard according to the formulas (1) to (12):

step four, respectively solving vertical components of longitudinal induction magnetic fields below a magnetic north course port, keel and starboard:

step five, respectively solving the vertical components of the transverse induction magnetic field below the magnetic east-navigation port, keel and starboard:

and step six, after the decomposition of the vertical component of the magnetic field of the ship is finished, comprehensively considering the X, Y, Z directional winding and simultaneously compensating the vertical component of the fixed magnetic field in the ampere-turn number adjustment process of the degaussing winding, compensating the vertical component of the longitudinal induced magnetic field by using the X directional winding, and compensating the vertical component of the transverse induced magnetic field by using the Y directional winding.

The invention has the following beneficial effects:

compared with the prior art, the method firstly decomposes the vertical magnetic field component of the asymmetric ship sailing in the same latitude area, and overcomes the defects that the conventional 'symmetric ship' is supposed to cause decomposition: 1) ziy and Zpy under the keel are equal to zero, and Ziy and Zpy under the port and starboard are opposite numbers; 2) zpx under the keel and the side are opposite to each other in fore and aft, and Zix and Zpx under the port and the starboard are equal to each other, so that the method has the effects of simple operation and reasonable and credible decomposition results, and finally improves the accuracy of magnetic field compensation.

Drawings

FIG. 1 is a diagram of the vertical component composition of a ship's magnetic field;

FIG. 2 is a component diagram of the vertical component of the magnetic field of an asymmetric ship according to an embodiment of the present invention;

FIG. 3 is a flow chart of a method for decomposing the vertical component of an asymmetric ship magnetic field.

Detailed Description

The invention is described in detail below by way of example with reference to the accompanying drawings.

A method for decomposing and compensating the vertical component of the magnetic field of an asymmetric ship comprises the following basic implementation processes:

the method comprises the steps of firstly, obtaining the vertical component of the original magnetic field of the ship through measurement, and measuring the original magnetic field of the ship on four main courses of east, south, west and north at the same water depth. Decomposing the vertical component Bz of the asymmetric ship magnetic field into three parts on the whole, wherein Zp is the vertical component of the fixed magnetic field, Zix is the vertical component of the longitudinal induction magnetic field, and the north course is Zix and the south course is-Zix; ziy is the vertical component of the transverse induction magnetic field, with an east heading of Ziy and a west heading of-Ziy, which can be known from the magnetization state of the ship.

And step two, finding out the vertical components of the original magnetic fields below a port, a keel and a starboard at the same longitudinal distance in the east navigation direction, respectively arranging the vertical components into a row according to the sequence from the ship bow to the ship stern, and the like.

The magnetic field of the ship at different directions and different positions consists of four main directions including east, south, west and north (E, S, W, N, z represents port, keel and y represents starboard)Representing the vertical component, Z, of the port magnetic east-navigation field_p(z)The vertical component of the magnetic field is fixed on the port, and the rest is analogized in turn.

Magnetic east navigation direction:

wherein Z is_iy(z)Representing a port side transverse induced magnetic field component;representing the vertical component, Z, of the keel magnetic east-navigation field_p(l)Indicating the magnetic vertical component, Z, of the fixed magnetic field of the keel_iy(l)Representing the transverse induction field component of the keel;represents the vertical component of the starboard magnetic east-navigation magnetic field; z_p(y)Representing the magnetic vertical component, Z, of the starboard fixed magnetic field_iy(y)Representing the starboard transverse induced magnetic field component;

magnetic south course:

wherein the content of the first and second substances,representing the vertical component of the port-side magnetic south course field, Z_ix(z)Representing the vertical component of the port side longitudinally induced magnetic field,representing the vertical component, Z, of the keel flux south course field_ix(l)Showing the vertical component of the longitudinal induced magnetic field of the keel,representing the vertical component of the starboard magnetic south course field, Z_ix(y)Represents the starboard longitudinal induced magnetic field vertical component;

magnetic western navigation direction:

wherein the content of the first and second substances,representing the vertical component of the port magnetic western-course field, Z_iy(z)Representing the port side transverse induced magnetic field vertical component,representing the vertical component, Z, of the magnetic field of the keel in the western direction_iy(l)Showing the vertical component of the magnetic field induced transversely to the keel,representing the vertical component of the starboard magnetic western-course field, Z_iy(y)Indicating starboard transverse induced magnetismA magnetic field vertical component;

magnetic north heading:

wherein the content of the first and second substances,representing the vertical component, Z, of the port side magneto-north heading magnetic field_ix(z)Representing the vertical component of the port side longitudinally induced magnetic field,representing the vertical component, Z, of the keel flux north heading magnetic field_ix(l)Showing the vertical component of the longitudinal induced magnetic field of the keel,representing the vertical component of the starboard magneto-north heading field, Z_ix(y)Showing the starboard longitudinal induced magnetic field vertical component.

Step three, respectively calculating the vertical components of the fixed magnetic fields below the port, keel and starboard according to the formulas (1) to (12):

step four, the vertical components of the longitudinal induction magnetic field under the magnetic north heading port, keel and starboard can be respectively solved through the formulas (16) to (18):

step five, the vertical components of the magnetic transverse induction magnetic field under the port, keel and starboard of the magnetic east navigation direction can be respectively obtained through the formulas (19) to (21):

and sixthly, after the vertical component of the magnetic field of the ship is decomposed, comprehensively considering the windings in the direction of X, Y, Z and compensating Zp simultaneously in the ampere-turn number adjustment process of the degaussing windings, compensating Zix by using the windings in the direction of X, and compensating Ziy by using the windings in the direction of Y.

Examples

For example, the magnetic field measurement data of a fishing boat in the east, south, west and north main directions are shown in Table 1

TABLE 1 magnetic field measurement data of a fishing vessel in east, south, west and north main courses

Comparing the measured data of the vertical component Bz under the keel in the east and west shipping directions in table 1, the values are found to be unequal, that is, Ziy under the keel is not zero, if the method is decomposed by a 'symmetrical ship' hypothesis, a system error is introduced, and the optimal demagnetization effect cannot be achieved in the subsequent demagnetization winding ampere-turn number adjustment process. The decomposition results of the method proposed in this patent are shown in Table 2

TABLE 2 data decomposed by asymmetric ship magnetic field vertical component decomposition method for certain fishing vessel

In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.