A magnetic antenna bracket

Abstract

The present invention proposes a magnetic antenna bracket, which is a high-reliability orthogonal three-component rod-shaped magnetic antenna bracket, comprising: an integrated compact hollow cylindrical bracket main structure and three identical magnetic antenna sleeve structures; wherein the integrated compact hollow cylindrical bracket main structure is the main part of the high-reliability three-component rod-shaped magnetic antenna bracket, and has a mounting interface for the magnetic antenna sleeve structure and the extension rod; the mounting interfaces of the three identical magnetic antenna sleeve structures on the hollow cylindrical bracket main structure adopt an integrated design, and the three identical magnetic antenna sleeve structures are mutually orthogonal in pairs, and are used to install the three-component magnetic antenna. It overcomes the traditional assembly method of using metal screws to fasten the magnetic antenna, such as the regular hexahedral plastic frame bracket, the discrete plastic component combination bracket, etc., which easily leads to the problem of structural reliability due to the stress concentration of the screw hole in a mobile environment with strong vibration, and has high reliability in mobile environments such as aviation, aerospace, land, and ocean.

Description

Technical Field

[0001] The invention relates to a rod-shaped magnetic antenna technology with mobile transmitting, receiving and positioning functions in the fields of aviation, aerospace, land, ocean, etc., and in particular to a high-reliability orthogonal three-component rod-shaped magnetic antenna bracket. Background Art

[0002] Rod-shaped magnetic antennas are widely used in aviation, aerospace, land, ocean and other fields, and have the functions of low-frequency radio transmission, reception and positioning. The magnetic antenna bracket is the supporting structure of the three-component rod-shaped magnetic antenna, and cooperates with the extension rod to make the rod-shaped magnetic antenna point to the required spatial orientation. The magnetic field is a vector with three mutually orthogonal components, and the sensor bracket needs to have the function of installing these three components orthogonally. The rod-shaped three-component magnetic antenna usually needs to be placed on a non-magnetic bracket, orthogonal to each other, and needs to keep a certain distance from the conditioning circuit part, so the magnetic antenna is usually installed at the end of a certain length of the extension rod. Magnetic antennas often work in a mobile environment with strong vibration, so the vibration resistance of the magnetic antenna bracket is required to be high. The LEMI-150 three-component magnetic antenna bracket of the Ukrainian LEMI LLC company, the three-component magnetic antenna bracket for the low-frequency magnetic field detection of the DEMETER satellite of the French Academy of Sciences, and the three-component magnetic antenna bracket for the low-frequency magnetic field detection of the THEMIS satellite adopt a discrete plastic component combination bracket fastened by metal screws and orthogonal assembly in pairs. This structure is prone to structural reliability problems due to stress concentration in the screw holes under strong vibration environments. The three-component magnetic antenna (or magnetic sensor) of the low-frequency magnetic field fluctuation analyzer of the TC-2 satellite uses a regular hexahedron plastic frame as a bracket. There are three pairs of mutually orthogonal magnetic antenna sleeve mounting threaded holes and two metal screw fixing holes on the regular hexahedron frame, so that the three-component magnetic antennas are fixed orthogonally in pairs. Therefore, the regular hexahedron plastic frame bracket of the magnetic antenna bracket is also prone to structural reliability problems due to stress concentration in the screw holes under strong vibration environments.

[0003] Finally, since the magnetic antenna is used to transmit and receive low-frequency radio signals, the metal screws used to install and fix it on the traditional bracket will produce magnetic noise interference, so the magnetic antenna bracket and fasteners need to be non-metallic materials that have no magnetic noise themselves.

[0004] Therefore, it is necessary to design a vibration-resistant, magnetic-noise-free, high-reliability orthogonal three-component rod-shaped magnetic antenna bracket. Summary of the invention

[0005] The purpose of the present invention is to provide a vibration-resistant, magnetic noise-free, high-reliability orthogonal three-component rod-shaped magnetic antenna bracket to overcome the problem of magnetic noise interference and structural reliability problems caused by stress concentration in screw holes in mobile environments with strong vibrations in traditional hexahedral plastic frame brackets, discrete plastic component combination brackets, etc., which use metal screws to fasten the magnetic antenna for assembly.

[0006] To achieve the above-mentioned purpose of the invention, a vibration-resistant, magnetic noise-free, high-reliability orthogonal three-component rod-shaped magnetic antenna bracket is proposed, comprising: an integrated compact hollow cylindrical bracket main structure and three identical magnetic antenna sleeve structures.

[0007] The invention is characterized in that the integrated compact hollow cylindrical bracket main structure is the main part of the high-reliability three-component rod-shaped magnetic antenna bracket, and has a magnetic antenna sleeve structure and an installation interface of the extension rod. The installation interfaces of three identical magnetic antenna sleeve structures on the hollow cylindrical bracket main structure adopt an integrated design, and the three identical magnetic antenna sleeve structures are mutually orthogonal in pairs, so as to install the three-component magnetic antenna.

[0008] Preferably, the axis of one of the magnetic antenna sleeve structures is perpendicular to and intersects with the axis of the hollow cylindrical support main structure, and one of the magnetic antenna sleeve structures is symmetrical about the axis of the hollow cylindrical support main structure.

[0009] Preferably, the axis of the second magnetic antenna sleeve structure is at a 45-degree angle to the axis of the hollow cylindrical bracket main structure, and the vertical distance between the midpoint of the line segment of its axis inside the hollow cylindrical bracket main structure and the axis of the hollow cylindrical bracket main structure is greater than the outer radius of the magnetic antenna sleeve structure.

[0010] Preferably, the third magnetic antenna sleeve structure is located at a spatial position where the second magnetic antenna sleeve structure is rotated 180 degrees around the axis of the hollow cylindrical bracket main structure.

[0011] Preferably, the geometric center line of the second magnetic antenna sleeve structure and the third magnetic antenna sleeve structure is perpendicular to the axis of the hollow cylindrical bracket main structure, and the geometric centers of the second magnetic antenna sleeve structure and the third magnetic antenna sleeve structure are symmetrical about the foot of the perpendicular.

[0012] Preferably, the distance between the midpoint of the line connecting the geometric centers of the second magnetic antenna sleeve structure and the third magnetic antenna sleeve structure and the geometric center of one of the magnetic antenna sleeve structures is greater than 1 times the outer radius of the magnetic antenna sleeve structure, but less than 2 times the outer radius of the magnetic antenna sleeve structure.

[0013] Preferably, the high-reliability orthogonal three-component rod-shaped magnetic antenna bracket has no metal parts and is made of engineering plastics.

[0014] Preferably, the outer diameter of the hollow cylindrical bracket main structure is greater than 2 times the outer diameter of the magnetic antenna sleeve structure and less than 2.5 times the outer diameter of the magnetic antenna sleeve structure.

[0015] Preferably, a slot for the magnetic antenna sleeve structure is provided between the magnetic antenna sleeve structure and the hollow cylindrical bracket main body structure to prevent the magnetic antenna sleeve from twisting.

[0016] Preferably, the magnetic antenna sleeve structure and the hollow cylindrical bracket main body structure are fixed by gluing.

[0017] Preferably, the main structure of the high-reliability orthogonal three-component rod-shaped magnetic antenna bracket is installed and fixed using a gluing process, without metal screws and components and without magnetic noise.

[0018] Preferably, any end of the hollow cylindrical bracket main body structure of the high-reliability orthogonal three-component rod-shaped magnetic antenna bracket can be used as a mounting interface for the extension rod.

[0019] Preferably, a fixing slot for preventing twisting is provided on the mounting interface of the extension rod of the high-reliability orthogonal three-component rod-shaped magnetic antenna bracket.

[0020] Preferably, a mounting interface of the extension rod of the high-reliability orthogonal three-component rod-shaped magnetic antenna bracket is provided with a positioning hole for preventing movement in the axial direction.

[0021] Preferably, the high-reliability orthogonal three-component rod-shaped magnetic antenna bracket and the extension rod are fixed by gluing.

[0022] Preferably, the relationship between the coordinate system formed by the three orthogonal component magnetic antennas on the high-reliability orthogonal three-component rod-shaped magnetic antenna bracket and the installation reference coordinate system is:

[0023]

[0024] Among them, X, Y, and Z are three orthogonal components of the high-reliability orthogonal three-component rod-shaped magnetic antenna bracket coordinate system, and X0, Y0, and Z0 are three orthogonal components of the bracket installation reference coordinate system. It is the conversion coefficient between the coordinate system formed by the three orthogonal components of the high-reliability orthogonal three-component rod-shaped magnetic antenna and the reference coordinate system. Depending on the installation direction of the reference coordinate system origin and the positive direction of the three components, M can also take other values.

[0025] The advantages of the present invention are: a vibration-resistant, magnetic noise-free, high-reliability orthogonal three-component rod-shaped magnetic antenna bracket is proposed. The high-reliability orthogonal three-component rod-shaped magnetic antenna bracket provided by the present invention adopts an integrated compact hollow cylindrical bracket main structure, has no metal parts and fasteners, symmetrical stress distribution, and a stress concentration coefficient of less than 1.2. It overcomes the problem of structural reliability caused by the traditional assembly method of the regular hexahedral plastic frame bracket, the discrete plastic component combination bracket, etc., which uses metal screws to fasten the magnetic antenna, and the stress concentration of the screw hole in a mobile environment with strong vibration is easily caused. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional schematic diagram of a high-reliability orthogonal three-component rod-shaped magnetic antenna bracket.

[0027] Figure 2 A three-dimensional outline diagram of a high-reliability orthogonal three-component rod-shaped magnetic antenna bracket.

[0028] Figure 3 This is a three-dimensional top view of a high-reliability orthogonal three-component rod-shaped magnetic antenna bracket.

[0029] Figure 4 This is a three-dimensional left view of a high-reliability orthogonal three-component rod-shaped magnetic antenna bracket.

[0030] Figure 5 It is a three-dimensional schematic diagram of the connection between a high-reliability orthogonal three-component rod-shaped magnetic antenna bracket and a stretching rod.

[0031] Figure 6 The figure is a schematic diagram of the relationship between the coordinate system formed by the three orthogonal component magnetic antennas of a high-reliability orthogonal three-component rod-shaped magnetic antenna bracket and the reference coordinate system.

[0032] The numbers in the figure are as follows:

[0033] 1 is the main structure of the hollow cylindrical bracket, 2 is the magnetic antenna sleeve structure, 3 is the magnetic antenna sleeve structure, 4 is the magnetic antenna sleeve structure, 5 is the fixed card slot, 6 is the positioning hole,

[0034] 7, 8, 9 are slots for preventing the magnetic antenna sleeve structure from twisting on the hollow cylindrical bracket main structure, and 10 is an extension rod. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0036] The present invention provides a vibration-resistant, orthogonal, non-magnetic, high-reliability three-component rod-shaped magnetic antenna bracket, which is used as a three-component rod-shaped magnetic antenna bracket for an electromagnetic monitoring test satellite payload induction magnetometer. Figure 1 In the embodiment shown, it includes: a hollow cylindrical bracket main body structure 1, and three identical magnetic antenna sleeve structures 2, 3, and 4.

[0037] like Figure 1 In the illustrated embodiment, the outer diameter of the hollow cylindrical bracket main structure of the three-component rod-shaped magnetic antenna bracket of the electromagnetic monitoring test satellite payload induction magnetometer is 70 mm, and the outer diameter of the magnetic antenna sleeve structure is 30 mm.

[0038] like Figure 1In the embodiment shown, the hollow cylindrical bracket main structure 1 is used as the main part of the high-reliability three-component rod-shaped magnetic antenna bracket, and one end thereof is used as a mounting interface, with two symmetrical fixing slots 5 and two symmetrical positioning holes 6 for limiting the extension rod. The mounting interfaces of the three magnetic antenna sleeve structures on the hollow cylindrical bracket main structure adopt an integrated design, and the three magnetic antenna sleeve structures are mutually orthogonal to each other, and are used to install the three-component magnetic antenna. The hollow cylindrical bracket main structure 1 has slots 7, 8, and 9 to prevent the magnetic antenna sleeve from twisting.

[0039] like Figure 2 In the illustrated embodiment, the axis of the magnetic antenna sleeve structure 2 is perpendicular to and intersects with the axis of the hollow cylindrical support body structure 1 , and the magnetic antenna sleeve structure 2 is symmetrical about the axis of the hollow cylindrical support body structure.

[0040] like Figure 3 In the illustrated embodiment, the geometric center line of the magnetic antenna sleeve structure 3 and the magnetic antenna sleeve structure 4 is perpendicular to the axis of the hollow cylindrical bracket main structure 1, and the geometric centers of the magnetic antenna sleeve structure 3 and the magnetic antenna sleeve structure 4 are symmetrical about the foot of the perpendicular.

[0041] like Figure 4 In the embodiment shown, the axis of the magnetic antenna sleeve structure 3 is at an angle of 45 degrees to the axis of the hollow cylindrical support main structure 1. Figure 3 In the embodiment shown, the vertical distance between the midpoint of the line segment of the axis of the magnetic antenna sleeve structure 3 inside the hollow cylindrical bracket main structure and the axis of the hollow cylindrical bracket main structure 1 is 16 mm, which is greater than the outer radius of the magnetic antenna sleeve structure of 15 mm.

[0042] like Figure 4 In the illustrated embodiment, the magnetic antenna sleeve structure 4 is located at a spatial position where the magnetic antenna sleeve structure 3 is rotated 180 degrees around the axis of the hollow cylindrical bracket main structure 1 .

[0043] like Figure 3 In the illustrated embodiment, the geometric center line of the magnetic antenna sleeve structure 3 and the magnetic antenna sleeve structure 4 is perpendicular to the axis of the hollow cylindrical support main structure 1. And the geometric centers of the magnetic antenna sleeve structure 3 and the magnetic antenna sleeve structure 4 are symmetrical about the foot of the perpendicular.

[0044] like Figure 4 In the illustrated embodiment, the midpoint of the line connecting the geometric centers of the magnetic antenna sleeve structure 3 and the magnetic antenna sleeve structure 4 is 18 mm away from the geometric center of the magnetic antenna sleeve structure 2, which is greater than 1 times the outer radius of the magnetic antenna sleeve structure 15 mm but less than 2 times the outer radius of the magnetic antenna sleeve structure 30 mm.

[0045] like Figure 2In the embodiment shown, the magnetic antenna sleeve slots 7, 8, 9 on the mounting interface between the magnetic antenna sleeve structures 2, 3, 4 and the hollow cylindrical bracket main structure prevent the magnetic antenna sleeves 2, 3, 4 from twisting. The magnetic antenna sleeve structures 2, 3, 4 and the hollow cylindrical bracket main structure 1 are fixed by gluing.

[0046] like Figure 5 In the embodiment shown, the mounting interface of the high reliability three-component rod-shaped magnetic antenna support extension rod 10 has a fixing slot 5 for limiting the extension rod position and a positioning hole 6 for preventing the extension rod from moving in the axial direction. The hollow cylindrical support main structure 1 of the magnetic antenna support and the extension rod 10 are fixed by gluing.

[0047] like Figure 1 In the illustrated embodiment, the hollow cylindrical bracket main structure 1 and the magnetic antenna sleeve structures 2, 3, 4 have no metal parts and fasteners, and are made of high-strength and high-temperature resistant engineering plastic polyimide.

[0048] like Figure 6 In the illustrated embodiment, a mounting hole on the sensor bottom plate of the electromagnetic monitoring test satellite payload induction magnetometer is defined as a reference point, and the conversion relationship from the three orthogonal components of the high-reliability three-component rod-shaped magnetic antenna bracket of the electromagnetic monitoring test satellite payload induction magnetometer to the installation reference coordinate system is as follows:

[0049]

[0050] Among them, the coordinate system conversion coefficient M is given in the above formula, are the three components of the AC magnetic field observation vector in the coordinate system formed by the magnetic antenna of the high-reliability three-component rod-shaped magnetic antenna bracket, X sc , Y sc , Z sc are the three components of the AC magnetic field observation vector in the installation reference coordinate system.

[0051] In addition, the embodiments of the present invention are only used as a method and should not be regarded as a factor limiting the present invention. For example:

[0052] Any end of the hollow cylindrical bracket main structure of the high-reliability three-component rod-shaped magnetic antenna bracket can be used as a mounting interface for the extension rod.

[0053] The high-reliability orthogonal three-component rod-shaped magnetic antenna bracket is made of special engineering plastics and has the characteristics of high and low temperature resistance. The high-reliability three-component rod-shaped magnetic antenna bracket adopts a gluing process and has no metal parts, which completely eliminates the magnetic noise from the traditional three-component magnetic antenna bracket. It has passed the sinusoidal vibration with an acceleration of 24g@20-100Hz, the random vibration with a total root mean square value of the power spectrum density of 40Grms, the impact vibration identification level test with an acceleration of 6dB / oct@100-600Hz and 1000g@600-4000Hz, and the thermal cycle identification level test from -120℃ to +120℃. Therefore, the three-component rod-shaped magnetic antenna bracket of the present invention has high reliability in mobile environments such as aviation, aerospace, land, and ocean.

Claims

1. A magnetic antenna bracket, which is a high-reliability orthogonal three-component rod-shaped magnetic antenna bracket, comprising: An integrated compact hollow cylindrical bracket main structure and three identical magnetic antenna sleeve structures, namely a first magnetic antenna sleeve structure, a second magnetic antenna sleeve structure and a third magnetic antenna sleeve structure; characterized in that: the integrated compact hollow cylindrical bracket main structure is the main part of a high-reliability three-component rod-shaped magnetic antenna bracket, and has a mounting interface for the magnetic antenna sleeve structure and the extension rod; the mounting interfaces of the three identical magnetic antenna sleeve structures on the hollow cylindrical bracket main structure adopt an integrated design, and the three identical magnetic antenna sleeve structures are mutually orthogonal in pairs, so as to be used for mounting the three-component magnetic antenna; The relationship between the coordinate system formed by the three orthogonal component magnetic antennas on the high-reliability orthogonal three-component rod-shaped magnetic antenna bracket and the installation reference coordinate system is: Among them, X, Y, Z are the three orthogonal components of the high-reliability orthogonal three-component rod-shaped magnetic antenna bracket coordinate system, and X0, Y0 and Z0 are the three orthogonal components of the bracket installation reference coordinate system; It is the conversion coefficient between the coordinate system formed by the three orthogonal components on the high-reliability orthogonal three-component rod-shaped magnetic antenna and the reference coordinate system.

2. A magnetic antenna bracket according to claim 1, characterized in that: The axis of the first magnetic antenna sleeve structure is perpendicular to and intersects with the axis of the hollow cylindrical bracket main structure, and the first magnetic antenna sleeve structure is symmetrical about the axis of the hollow cylindrical bracket main structure.

3. The magnetic antenna bracket according to claim 1, characterized in that: The axis of the second magnetic antenna sleeve structure is at a 45-degree angle to the axis of the hollow cylindrical bracket main structure, and the vertical distance between the midpoint of the line segment inside the hollow cylindrical bracket main structure and the axis of the hollow cylindrical bracket main structure is greater than the outer radius of the magnetic antenna sleeve structure.

4. A magnetic antenna bracket according to claim 2 or 3, characterized in that: The third magnetic antenna sleeve structure is located at a spatial position where the second magnetic antenna sleeve structure is rotated 180 degrees around the axis of the hollow cylindrical bracket main structure.

5. A magnetic antenna bracket according to claim 4, characterized in that: A line connecting the geometric centers of the second magnetic antenna sleeve structure and the third magnetic antenna sleeve structure is perpendicular to the axis of the hollow cylindrical bracket main structure, and the geometric centers of the second magnetic antenna sleeve structure and the third magnetic antenna sleeve structure are symmetrical about the foot of the perpendicular.

6. A magnetic antenna bracket according to claim 1 or 5, characterized in that: The midpoint of the line connecting the geometric centers of the second magnetic antenna sleeve structure and the third magnetic antenna sleeve structure is at a distance greater than 1 times the outer radius of the magnetic antenna sleeve structure, but less than 2 times the outer radius of the magnetic antenna sleeve structure; the outer diameter of the hollow cylindrical bracket main structure is greater than 2 times the outer diameter of the magnetic antenna sleeve structure and less than 2.5 times the outer diameter of the magnetic antenna sleeve structure.

7. The magnetic antenna bracket according to claim 1, characterized in that: The high-reliability orthogonal three-component rod-shaped magnetic antenna bracket material has no metal parts and is made of engineering plastics; a slot for the magnetic antenna sleeve structure is provided between the magnetic antenna sleeve structure and the hollow cylindrical bracket main structure to prevent the magnetic antenna sleeve from twisting.

8. A magnetic antenna bracket according to claim 1 or 7, characterized in that: The magnetic antenna sleeve structure is fixed to the main structure of the hollow cylindrical bracket by gluing; the main structure of the high-reliability orthogonal three-component rod-shaped magnetic antenna bracket is installed and fixed by gluing technology, without metal screws and parts, and without magnetic noise; the high-reliability orthogonal three-component rod-shaped magnetic antenna bracket is fixed to the extension rod by gluing.

9. The magnetic antenna bracket according to claim 8, characterized in that: Any end of the hollow cylindrical bracket main structure of the high-reliability orthogonal three-component rod-shaped magnetic antenna bracket can be used as a mounting interface for the extension rod; the mounting interface has a fixed groove to prevent torsion, and the mounting interface has a positioning hole to prevent axial movement.

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