Cylindrical reverberation chamber for thin and long body integral electromagnetic compatibility test

Abstract

The utility model provides a cylindrical reverberation chamber used for an integral electromagnetic compatibility test of a slender body, which belongs to the technical field of electromagnetic compatibility test, and comprises a cylindrical shielding cavity, a vertical stirrer, a horizontal stirrer and a driving motor, and a cavity is formed in the cylindrical shielding cavity; the plurality of vertical stirrers are arranged in the cavity, each vertical stirrer has a degree of freedom of rotation in the circumferential direction of the axis of the vertical stirrer, and the distances between the plurality of vertical stirrers and the axis of the cylindrical shielding cavity are equal; the horizontal stirrer is arranged at the top of the chamber and has a degree of freedom of circumferential rotation along the axis of the horizontal stirrer; power output shafts of the plurality of driving motors penetrate through the cylindrical shielding cavity and are correspondingly connected with the plurality of vertical stirrers and the horizontal stirrers respectively, and the plurality of driving motors are used for driving the plurality of vertical stirrers and the horizontal stirrers to rotate respectively. The electromagnetic compatibility testing device has the technical effects that the electromagnetic compatibility testing device is suitable for electromagnetic compatibility testing of slender integrated equipment, and the testing difficulty and the testing cost are reduced.

Description

Technical Field

[0001] This utility model belongs to the field of electromagnetic compatibility testing technology, and more specifically, it relates to a cylindrical reverberation chamber for electromagnetic compatibility testing of slender body assembly. Background Technology

[0002] Reverberation chambers are used for radiated immunity testing and radiated interference testing, leading to their increasing importance and wider application in the automotive and parts, large electronic systems, and especially military electronic products. A reverberation chamber is a specialized experimental system consisting of a shielded cavity, filters, a stirrer, an RF signal source, a power RF amplifier, transmitting and receiving antennas, power and field strength monitoring equipment, a receiver, and testing and calibration software.

[0003] With the widespread use of electronic devices, electromagnetic compatibility testing has become increasingly important, especially for slender, fully assembled devices, which are more challenging to test because their one-dimensional dimensions are often much larger than other dimensions. Traditional testing methods are limited by factors such as confidentiality requirements and weather conditions, or require equipment such as high-power amplifiers, resulting in a significant increase in testing costs. Utility Model Content

[0004] The purpose of this invention is to provide a cylindrical reverberation chamber for electromagnetic compatibility testing of slender, assembled equipment, aiming to solve the technical problems of high testing difficulty and high testing cost for electromagnetic compatibility testing of slender, assembled equipment.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a cylindrical reverberation chamber for electromagnetic compatibility testing of slender, integrally assembled bodies, comprising:

[0006] The cylindrical shielding cavity has an internal chamber.

[0007] Multiple vertical stirrers are provided inside the chamber. Each vertical stirrer has a circumferential rotational degree of freedom along its own axis. The distance between the multiple vertical stirrers and the axis of the cylindrical shielded cavity is equal.

[0008] A horizontal stirrer is located at the top of the chamber and has a circumferential degree of freedom of rotation along its own axis;

[0009] There are multiple drive motors, all of which are connected to the outer wall of the cylindrical shield cavity. The power output shafts of the multiple drive motors pass through the cylindrical shield cavity and are respectively connected to the multiple vertical stirrers and the multiple horizontal stirrers. The multiple drive motors are used to drive the multiple vertical stirrers and the multiple horizontal stirrers to rotate in a one-to-one correspondence.

[0010] In one possible implementation, the cylindrical shielding cavity is suitable for frequencies above 3-6 times the master mode resonant frequency.

[0011] In one possible implementation, the master mode of the cylindrical shielding cavity is defined as TE. 111 The relationship satisfied by its dominant mode resonant frequency is:

[0012]

[0013] Where c is the speed of light, a is the radius of the cylindrical shielding cavity, and l is the height of the cylindrical shielding cavity.

[0014] In one possible implementation, the horizontal stirrer includes a horizontal rotating shaft rotatably connected to the cylindrical shielded cavity and at least one set of horizontal folding blades. The horizontal rotating shaft is horizontally arranged, and each set of horizontal folding blades is V-shaped, angled in the direction perpendicular to the horizontal rotating shaft. The horizontal rotating shaft passes through the center of the horizontal folding blades.

[0015] In one possible implementation, the vertical stirrer includes a vertical rotating shaft rotatably connected to the cylindrical shielded cavity and at least one set of vertical folding blades. The vertical rotating shaft is vertically arranged, and each set of vertical folding blades is V-shaped, angled in the direction perpendicular to the vertical rotating shaft. The vertical rotating shaft passes through the center of the vertical folding blades.

[0016] In one possible implementation, the angle of the vertical folding blade is greater than 90 degrees.

[0017] In one possible implementation, the vertical stirrer includes a vertical rotating shaft rotatably connected to the cylindrical shielded cavity and at least one set of cross blades. The vertical rotating shaft is vertically arranged, and each set of cross blades is cross-shaped. The vertical rotating shaft passes through the center of the cross blades. Each cross blade includes two blades that combine to form a cross shape.

[0018] In one possible implementation, the cylindrical shielding cavity is cylindrical or a regular heptagonal prism.

[0019] The beneficial effects of this utility model regarding a cylindrical reverberation chamber for electromagnetic compatibility testing of slender body assemblies are as follows: Compared with the prior art, this utility model provides a cylindrical shielded cavity for electromagnetic compatibility testing of slender body assemblies, comprising a cylindrical shielded cavity, vertical stirrers, horizontal stirrers, and a drive motor. A chamber is formed inside the cylindrical shielded cavity; multiple vertical stirrers are arranged inside the chamber, each having a circumferential rotational degree of freedom along its own axis, and the distances between the multiple vertical stirrers and the axis of the cylindrical shielded cavity are equal; the horizontal stirrer is located at the top of the chamber and has… It has a circumferential rotational degree of freedom along its own axis; there are multiple drive motors, all located on the outer wall of the cylindrical shielded cavity. The power output shafts of the multiple drive motors pass through the cylindrical shielded cavity and are respectively connected to the multiple vertical stirrers and the multiple horizontal stirrers. The multiple drive motors are used to drive the multiple vertical stirrers and the multiple horizontal stirrers to rotate. This solves the technical problems of high difficulty and high cost in electromagnetic compatibility testing of slender assembled equipment. It has the technical effect of being suitable for electromagnetic compatibility testing of slender assembled equipment and reducing the difficulty and cost of testing. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the structure of a cylindrical reverberation chamber for electromagnetic compatibility testing of slender body assembly provided in this embodiment of the present invention;

[0022] Figure 2 A top view of a cylindrical reverberation chamber for electromagnetic compatibility testing of slender body assembly, provided as an embodiment of this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Cylindrical shielded cavity; 1.1. Chamber; 2. Vertical stirrer; 2.1. Vertical rotating shaft; 2.2. Vertical folding blades; 2.3. Cross blades; 3. Horizontal stirrer; 3.1. Horizontal rotating shaft; 3.2. Horizontal folding blades; 4. Drive motor. Detailed Implementation

[0025] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0026] Please refer to the following: Figures 1 to 2 This invention provides a cylindrical reverberation chamber for electromagnetic compatibility testing of slender body assemblies. The cylindrical reverberation chamber includes a cylindrical shielded cavity 1, vertical stirrers 2, horizontal stirrers 3, and drive motors 4. The cylindrical shielded cavity 1 contains a chamber 1.1. Multiple vertical stirrers 2 are located inside the chamber 1.1, each having a circumferential rotational degree of freedom along its own axis. The distances between the multiple vertical stirrers 2 and the axis of the cylindrical shielded cavity 1 are equal. The horizontal stirrers 3 are located at the top of the chamber 1.1 and also have a circumferential rotational degree of freedom along their own axis. Multiple drive motors 4 are connected to the outer wall of the cylindrical shielded cavity 1. The power output shafts of the multiple drive motors 4 pass through the cylindrical shielded cavity 1 and are respectively connected to the multiple vertical stirrers 2 and horizontal stirrers 3. The multiple drive motors 4 are used to drive the rotation of the multiple vertical stirrers 2 and horizontal stirrers 3 in a one-to-one correspondence.

[0027] This utility model provides a cylindrical reverberation chamber for electromagnetic compatibility testing of slender body assembly. Compared with the prior art, by setting the reverberation chamber into a cylindrical shape and by setting multiple vertical stirrers 2 and horizontal stirrers 3 in cooperation, electromagnetic compatibility testing of slender body assembly can be carried out. Moreover, the operation of the drive motor 4 is controllable, which solves the technical problems of high testing difficulty and high testing cost for electromagnetic compatibility testing of slender body assembly equipment. It has the technical effect of being suitable for electromagnetic compatibility testing of slender body assembly equipment and reducing testing difficulty and testing cost.

[0028] In this embodiment, in addition to the multiple vertical stirrers 2 and horizontal stirrers 3 arranged inside the chamber 1.1 as described above, other structures as in the prior art are also provided, thereby enabling electromagnetic compatibility testing of slender assembled equipment (such as aircraft), reducing testing difficulty and cost. For operations such as installing and removing slender assembled equipment into the chamber 1.1, an opening can be provided on the side of the cylindrical shielded cavity 1, with a door at the opening. Opening the door allows the cylindrical shielded cavity 1 to enter and exit the chamber 1.1, forming a passage for the slender assembled equipment to enter and exit the chamber 1.1. Shielding material is also provided on the inner wall of the door, thus providing shielding function and effect.

[0029] In some embodiments, please refer to Figures 1 to 2 The cylindrical shielded cavity 1 is suitable for frequencies above 3-6 times the dominant mode resonant frequency; the dominant mode of the cylindrical shielded cavity 1 is defined as TE.111 The relationship satisfied by its dominant mode resonant frequency is:

[0030]

[0031] Where c is the speed of light, a is the radius of the cylindrical shielding cavity 1, and l is the height of the cylindrical shielding cavity 1. That is, the structure of the cylindrical shielding cavity 1 in this embodiment is different from the shielding cavity in the prior art. This shielding cavity can be used for electromagnetic compatibility testing of slender, assembled equipment, and it has the aforementioned specific master mode resonant frequency.

[0032] In some embodiments, please refer to Figures 1 to 2 The horizontal stirrer 3 includes a horizontal rotating shaft 3.1 rotatably connected to the cylindrical shielded cavity 1 and at least one set of horizontal folding blades 3.2. The horizontal rotating shaft 3.1 is horizontally positioned, and each set of horizontal folding blades 3.2 is V-shaped, angled towards the vertical direction of the horizontal rotating shaft 3.1. The horizontal rotating shaft 3.1 passes through the center of the horizontal folding blades 3.2. Both ends of the horizontal rotating shaft 3.1 can be rotatably connected to the inner wall of the cylindrical shielded cavity 1 via rotating seats such as bearings. Driven by the drive motor 4, it can rotate, thereby driving the horizontal folding blades 3.2 to rotate. In this embodiment, multiple sets of horizontal folding blades 3.2 are provided, and adjacent sets of horizontal folding blades 3.2 are in contact or connected to each other.

[0033] Preferably, the opening angle of the horizontal folding blade 3.2 is greater than 90 degrees.

[0034] In some embodiments, please refer to Figures 1 to 2 The vertical stirrer 2 includes a vertical rotating shaft 2.1 rotatably connected to a cylindrical shielded cavity 1 and at least one set of vertical folding blades 2.2. The vertical rotating shaft 2.1 is vertically arranged, and each set of vertical folding blades 2.2 is V-shaped, angled towards the vertical rotating shaft 2.1. The vertical rotating shaft 2.1 passes through the center of the vertical folding blades 2.2. The upper and lower ends of the vertical rotating shaft 2.1 can be rotatably connected to the inner wall of the cylindrical shielded cavity 1 through rotating seats such as bearings. Driven by the drive motor 4, it can rotate, thereby driving the vertical folding blades 2.2 to rotate. In this embodiment, multiple sets of vertical folding blades 2.2 are provided, and adjacent sets of vertical folding blades 2.2 are in contact or connected to each other.

[0035] In some embodiments, please refer to Figures 1 to 2 The angle of the vertically folding blade 2.2 is greater than 90 degrees.

[0036] In some embodiments, please refer to Figures 1 to 2The vertical stirrer 2 includes a vertical rotating shaft 2.1 rotatably connected to the cylindrical shielded cavity 1 and at least one set of cross blades 2.3. The vertical rotating shaft 2.1 is vertically arranged, and each set of cross blades 2.3 is cross-shaped. The vertical rotating shaft 2.1 passes through the center of the cross blades 2.3. Each cross blade 2.3 includes two blades that combine to form a cross shape. In this embodiment, the cross blades 2.3 are arranged in multiple sets at intervals and are equally spaced along the axial direction of the vertical rotating shaft 2.1.

[0037] In this invention, the vertical rotating shaft 2.1 with vertical folding blades 2.2 is configured in two sets, and the vertical rotating shaft 2.1 with cross blades 2.3 is also configured in two sets, as follows. Figure 2 The deployment locations are shown in the diagram.

[0038] Since there are multiple vertical stirrers 2, four can be evenly arranged in this invention, that is... Figure 2 The arrangement is shown in the diagram. A uniform region is formed inside the cylindrical area enclosed by multiple vertical stirrers 2, and the object to be tested can be placed inside, such as... Figure 2 The aircraft model shown is the object under test. The placement of the vertical stirrer 2 does not affect the placement of the horizontal stirrer 3; the two do not interfere with each other. In this embodiment, four sets of drive motors 4 are located at the top of the cylindrical shielded cavity 1, each connected to and driving the four vertical stirrers 2 to rotate. The drive motor 4 connected to the horizontal rotating shaft 3.1 is located on the side wall of the cylindrical shielded cavity 1 (not shown in the figure), thus driving the horizontal rotating shaft 3.1 to rotate. The horizontal rotating shaft 3.1 is set as one set. Multiple sets of vertical stirrers 2 and one set of horizontal rotating shafts 3.1 can form a uniform area suitable for electromagnetic compatibility testing, thereby enabling the testing of slender, assembled equipment.

[0039] This invention also includes a controller electrically connected to multiple sets of drive motors 4. The controller includes a PLC control chip, control circuitry, and multiple control modules. Through its connection to the drive motors 4, it can control the operation of multiple drive motors 4 individually, controlling parameters such as start / stop and speed, thereby enabling electromagnetic compatibility testing. The power output end of each drive motor 4 is connected to an output shaft, which passes through the cylindrical shielded cavity 1 and connects to one end of a horizontal rotating shaft 3.1 or one end of a vertical rotating shaft 2.1. Support frames or other structures can be installed on the outer and top walls of the cylindrical shielded cavity 1 to support the drive motors 4 and ensure operational stability.

[0040] In some embodiments, please refer to Figure 1 The cylindrical shielding cavity 1 is cylindrical or regular heptagonal prism. In this utility model, it is cylindrical, so its internal chamber 1.1 is also cylindrical.

[0041] The positive effects of this utility model are:

[0042] 1) Columnar reverberation chamber design: The structure inside chamber 1.1 and the setting of the stirrer enable the formation of a statistically uniform field with random polarization within chamber 1.1 to simulate a complex electromagnetic environment for electromagnetic compatibility testing.

[0043] 2) Simulating complex electromagnetic environment: By designing a cylindrical shielded cavity 1, a statistically uniform field with random polarization can be formed inside the cavity 1.1, thereby simulating a complex electromagnetic environment and providing reliable test conditions for the overall electromagnetic compatibility test.

[0044] 3) Improve testing efficiency and accuracy: The specific cylindrical structure design can ensure the field uniformity and normalized field strength value during testing, thereby improving the efficiency and accuracy of testing.

[0045] 4) Reduced testing costs: Compared to traditional methods that require high-power amplifiers and other equipment, cylindrical shielded cavities can achieve testing in a more economical way, reducing testing costs.

[0046] In summary, this utility model provides an efficient, economical, and accurate testing solution for slender body assembly electromagnetic compatibility testing, which has a positive effect on improving test quality and reducing test costs.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cylindrical reverberation chamber for electromagnetic compatibility testing of slender, integrally assembled bodies, characterized in that, include: The cylindrical shielding cavity has an internal chamber. Multiple vertical stirrers are provided inside the chamber. Each vertical stirrer has a circumferential rotational degree of freedom along its own axis. The distance between the multiple vertical stirrers and the axis of the cylindrical shielded cavity is equal. A horizontal stirrer is located at the top of the chamber and has a circumferential degree of freedom of rotation along its own axis; There are multiple drive motors, all of which are connected to the outer wall of the cylindrical shield cavity. The power output shafts of the multiple drive motors pass through the cylindrical shield cavity and are respectively connected to the multiple vertical stirrers and the multiple horizontal stirrers. The multiple drive motors are used to drive the multiple vertical stirrers and the multiple horizontal stirrers to rotate in a one-to-one correspondence.

2. The cylindrical reverberation chamber for electromagnetic compatibility testing of slender, integrally assembled bodies as described in claim 1, characterized in that, The cylindrical shielding cavity is suitable for frequencies above 3-6 times the main mode resonant frequency.

3. A cylindrical reverberation chamber for electromagnetic compatibility testing of slender, integrally assembled bodies as described in claim 2, characterized in that, The master model of the cylindrical shielding cavity is defined as TE. 111 The relationship satisfied by its dominant mode resonant frequency is: Where c is the speed of light, a is the radius of the cylindrical shielding cavity, and l is the height of the cylindrical shielding cavity.

4. A cylindrical reverberation chamber for electromagnetic compatibility testing of slender, integrally assembled bodies as described in claim 1, characterized in that, The horizontal stirrer includes a horizontal rotating shaft rotatably connected to the cylindrical shielded cavity and at least one set of horizontal folding blades. The horizontal rotating shaft is horizontally arranged, and each set of horizontal folding blades is V-shaped, angled in the direction perpendicular to the horizontal rotating shaft. The horizontal rotating shaft passes through the center of the horizontal folding blades.

5. A cylindrical reverberation chamber for electromagnetic compatibility testing of slender, integrally assembled bodies as described in claim 1, characterized in that, The vertical stirrer includes a vertical rotating shaft rotatably connected to the cylindrical shielded cavity and at least one set of vertical folding blades. The vertical rotating shaft is vertically arranged, and each set of vertical folding blades is V-shaped, angled in the direction perpendicular to the vertical rotating shaft. The vertical rotating shaft passes through the center of the vertical folding blades.

6. A cylindrical reverberation chamber for electromagnetic compatibility testing of slender, integrally assembled bodies as described in claim 5, characterized in that, The angle of the vertical folding blade is greater than 90 degrees.

7. A cylindrical reverberation chamber for electromagnetic compatibility testing of slender, integrally assembled bodies as described in claim 1, characterized in that, The vertical stirrer includes a vertical rotating shaft rotatably connected to the cylindrical shielded cavity and at least one set of cross blades. The vertical rotating shaft is vertically arranged, and each set of cross blades is cross-shaped. The vertical rotating shaft passes through the center of the cross blades.

8. A cylindrical reverberation chamber for electromagnetic compatibility testing of slender, integrally assembled bodies as described in claim 7, characterized in that, The cross-shaped blade comprises two blades that combine to form a cross shape.

9. A cylindrical reverberation chamber for electromagnetic compatibility testing of slender, integrally assembled bodies as described in claim 1, characterized in that, The cylindrical shielding cavity is cylindrical in shape.

10. A cylindrical reverberation chamber for electromagnetic compatibility testing of slender, integrally assembled bodies as described in claim 1, characterized in that, The cylindrical shielding cavity is in the shape of a regular heptagonal prism.

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