CN110133411B - Method for enhancing uniformity of field intensity inside horizontal polarization bounded wave electromagnetic pulse simulator - Google Patents

Method for enhancing uniformity of field intensity inside horizontal polarization bounded wave electromagnetic pulse simulator Download PDF

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CN110133411B
CN110133411B CN201910470275.4A CN201910470275A CN110133411B CN 110133411 B CN110133411 B CN 110133411B CN 201910470275 A CN201910470275 A CN 201910470275A CN 110133411 B CN110133411 B CN 110133411B
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eccentric
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朱湘琴
张国伟
吴伟
王海洋
杜太焦
谢霖燊
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Northwest Institute of Nuclear Technology
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    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract

The invention provides a leveling deviceThe method for enhancing the uniformity of the field intensity in the polarized bounded wave electromagnetic pulse simulator improves the uniformity of the field intensity in a certain range in the simulator, increases the area of an effective experimental area for an EMP effect experiment, and finally improves the performance of the simulator. The method is that the shape of the polar plates on the two sides of the ground of the simulator is changed into two symmetrical eccentric arcs from two parallel straight lines with equal length; the symmetric axis of the two symmetrical eccentric arcs is the x axis, and the opening size d formed by the end parts of the two symmetrical eccentric arcskThe range of the eccentric arcs is equivalent to the range of the test area in the z direction, and the respective centers of the eccentric arcs on the left side and the right side are respectively positioned on the Z axis O1Right and left sides of the point; and respectively pulling metal wires from the bottom of the double cones of the simulator to the two symmetrical eccentric arcs on the ground to form polar plates on two sides of the simulator, so as to obtain the simulator with enhanced field intensity uniformity.

Description

Method for enhancing uniformity of field intensity inside horizontal polarization bounded wave electromagnetic pulse simulator
Technical Field
The invention relates to a method for enhancing field intensity uniformity of a test area in a horizontally polarized bounded wave electromagnetic pulse simulator.
Background
In order to systematically study the electromagnetic pulse (EMP) effect and the ruggedization measure of an electronic system, an electromagnetic pulse simulation apparatus must be established. At present, the existing horizontal polarization environment simulation equipment at home and abroad mainly comprises a biconical cage-shaped radiation wave antenna, a horizontally polarized bounded wave electromagnetic pulse simulator and the like.
The biconical cage-shaped radiation wave antenna has the advantages of normal impedance, wide frequency band, good uniformity of a field parallel to the axis of the biconical antenna and the like, but needs a large diameter and a sufficient length to obtain a large enough effective experimental area, so that the biconical cage-shaped antenna is expensive in manufacturing cost.
A horizontally polarized bounded wave electromagnetic pulse simulator, as in document 1: BAILEY V et al, published in the journal of IEEE Trans. plasma Science 2010, volume 38, pages 2557 and 2558, "A6-MV pulser to drive horizontal polarized EMP standards"; document 2: "parallel simulation analysis of large-scale horizontally polarized electromagnetic pulse bounded wave electromagnetic pulse simulator" published by zhuxinqin et al in journal of "computational physics" on pages 1-8 of network edition 2018 ", website: http:// kns.cnki.net/kcms/detail/11.2011. O4.20180928.1403.004.html. This type of horizontally polarized simulator is not only inexpensive, but also provides free space and near-surface EMP environments. However, such a horizontally polarized bounded wave EMP simulator must provide a uniform field space for the device under test (EUT), i.e., the effective experimental area for the EMP effect experiment is determined by the uniformity of the field strength inside the simulator, and thus the uniformity of the field strength inside the simulator directly affects the performance of the simulator.
Therefore, it is necessary to study the manner of enhancing the internal field intensity uniformity of a horizontally polarized bounded wave electromagnetic pulse simulator. At present, no relevant report exists at home and abroad.
Disclosure of Invention
The invention provides a method for enhancing the uniformity of field intensity in a horizontal polarization bounded wave electromagnetic pulse simulator, which improves the uniformity of field intensity in a certain range in the simulator, increases the area of an effective experimental area for an EMP effect experiment, and finally improves the performance of the simulator.
The applicant researches and discovers that: under the condition of keeping the height of the horizontal polarized bounded wave EMP simulator unchanged and the impedance matching of the bipyramid characteristic, a simulator polar plate is formed by pulling a wire from the bottom of the bipyramid of the simulator to the ground, and if the shape of the polar plate of the simulator on the ground is changed into a symmetrical eccentric arc shape from two parallel straight lines with equal length (the term "eccentricity" refers to the projection O of the circle center of the arc deviating from the center point of the bipyramid of the simulator on the ground1Point), the field strength in a certain area inside the simulator appears to have an enhanced uniformity.
The solution of the invention is thus summarized as follows:
a method of enhancing uniformity of field strength within a horizontally polarized bounded wave electromagnetic pulse simulator, comprising:
the shape of the polar plates on two sides of the ground of the simulator is changed into two symmetrical eccentric arcs from two parallel straight lines with equal length; the arc length of the eccentric arc is equal to the length w of the parallel straight line, and the projection of the center point of the double cone of the simulator on the ground is set as O1Point, through O1The coordinate axis of the point perpendicular to the parallel straight line is marked as z-axis and passes through O1The coordinate axis which is point and parallel to the parallel straight line is marked as an x axis, the symmetric axis of the two symmetrical eccentric circular arcs is the x axis, and the opening size d formed by the end parts of the two symmetrical eccentric circular arcskThe range of the eccentric arcs is equivalent to the range of the test area in the z direction, and the respective centers of the eccentric arcs on the left side and the right side are respectively positioned on the Z axis O1Right and left sides of the point;
and respectively pulling metal wires from the bottom of the double cones of the simulator to the two symmetrical eccentric arcs on the ground to form polar plates on two sides of the simulator, so as to obtain the simulator with enhanced field intensity uniformity.
Wherein the positions and shapes of the two symmetrical eccentric arcs can be determined as follows:
the shape of a polar plate on the ground of a conventional simulator is set as two parallel left/right straight lines with equal length, the length of the two straight lines is w, and the distance between the two straight lines is d; the eccentric circular arc is tangent to the corresponding parallel straight line at the z-axis, wherein the radius of the right eccentric circular arc is recorded as r2Center position O of right eccentric arc2The point deviates from O in the-z direction1Point d2At a distance of (d) from the opening of the simulator after deformationkThe same range as the test area in the z direction is taken as d3＝d k2, then r2The following two equations are used:
r2·2·atan[L/(r2-d3)]＝w
Figure BDA0002080634470000021
and d2＝r2-d/2。
The scheme analysis and the concrete implementation process are as follows:
1) the shape of the polar plate on the ground of the conventional simulator is two parallel left/right straight lines with equal length, the length of the two straight lines is w, and the distance between the two straight lines is d. The conventional simulator is deformed, as shown in figure 1, the right circular arc on the ground is tangent to the right straight line of the conventional simulator to obtain a tangent point Q1And
d1+d3＝d/2 (1)
maintaining the mouth d of the simulator after deformationkThe same extent as the z-direction of the test zone. D in the above formula is set to keep a certain distance between the measuring point at the upper right corner of the test area and the polar plate3＝d k2; d and d3Substituting the value of (b) into the above formula to obtain d1The value of (c).
2) Maintaining the arc length of a single arc the same as the length w of a conventional simulator unipolar plate, i.e.
r2·2·atan[L/(d1+d2)]＝w (2)
In addition, as can be seen from FIG. 1,
d1+d2＝r2-d3 (3)
Figure BDA0002080634470000022
substituting the formula (3) into the formulae (2) and (4) respectively to obtain
r2·2·atan[L/(r2-d3)]＝w (5)
Figure BDA0002080634470000023
From the above two formulae, r can be obtained2The value of (c). Then d is put1、d3And r2Substituting the value of (2) into the formula (3) to obtain d2The value of (c).
3) And drawing a new ground arc according to the parameters. The drawing method comprises the following steps:
a) the projection of the center point of the double cones of the simulator on the ground is O1Point, offset from O along-z direction1Point d2Is a distance ofTo obtain O2Point; with O2Point as center of circle/r2To the radius, a circle is drawn.
b) Cutting a circle z not more than d by a square1The right circular arc is obtained.
c) A left side circular arc is made symmetrical about z 0.
4) And respectively pulling metal wires from the bottom of the double cones of the simulator to the left side and the right side of the ground to form polar plates on two sides of the simulator, thereby obtaining the novel simulator.
The invention has the following beneficial effects:
1. based on the pulling of the polar plate of the simulator, the technical problem that the field intensity inside the simulator is weak in uniformity is solved by changing the shape of the ground polar plate;
2. under the conditions of high fixation of the simulator frame and impedance matching, the area of an effective experiment area of the simulator for EMP effect experiments is increased, and the performance of the simulator is improved.
Drawings
Figure 1 is the shape of the simulator on the ground pad. In the figure, 1 is the right line of the conventional simulator, 2 is the left line of the conventional simulator, 3 is the left arc of the simulator in the present invention, and 4 is the right arc of the simulator in the present invention. In addition, the position O of the projection of the center point of the double cone of the marking simulator on the ground is marked in the figure1The point and the central point position O of the right circular arc obtained after the new simulator is intersected with the ground2And (4) point.
Fig. 2 is a distribution diagram of electric field horizontal polarization component peaks in a region of 30m × 30m on a horizontal plane 3m from the ground inside the simulator, where (a) is data of a conventional simulator and (b) is data of a simulator of the present invention.
Detailed Description
In order to realize the uniformity enhancement of the internal field intensity of the horizontal polarization simulator, the simulator formed by the eccentric arc stay wire from the cone bottom to the ground is adopted, and the uniformity enhancement of the internal field intensity of the simulator is realized. The invention is further illustrated by the following examples in conjunction with the accompanying drawings.
The structure of this example is shown in FIG. 1, and the simulator stand is set to be 15m high, which is conventionalThe length w of two parallel straight lines intersected with the ground by the simulator is 72m, and the distance d is 48 m. Position O of projection of central point of double cone on ground1Point, central point position O of right circular arc obtained after new simulator intersects with ground2Dots with a pitch of d2. In this embodiment, the intersection of the new simulator and the ground is two arcs, the opening of the arc is dk(ii) a The z-direction test area range inside the simulator is about 26.8 m. The simulator excitation source is a double exponential pulse with a rising edge of 2.5ns and a half-height width of 23 ns.
The concrete links are introduced as follows:
1) when the shape of the pole plate of the simulator on the ground is two parallel left/right straight lines with equal length, the simulator is called a conventional simulator, and the length of the two straight lines is both w-72 m, and the distance between the two straight lines is d-48 m. The conventional simulator is deformed. As shown in figure 1, the right circular arc on the ground is tangent to the right straight line of the conventional simulator to obtain a tangent point Q1And
d1+d3＝d/2 (1)
maintaining the mouth d of the simulator after deformationkThe same as the z-direction range 26.8m of the test area, d in the above formula3＝dk13.4 is/2; d and d3Substituting the value of (b) into the above formula to obtain d1＝10.6m。
2) Maintaining the arc length of a single arc the same as the length w of a conventional simulator unipolar plate, i.e.
r2·2·atan[L/(d1+d2)]＝w＝72m (2)
In addition, as can be seen from the above figures,
d1+d2＝r2-d3 (3)
Figure BDA0002080634470000031
substituting the formula (3) into the formulae (2) and (4) respectively to obtain
r2·2·atan[L/(r2-d3)]＝w＝72m (5)
Figure BDA0002080634470000041
From the above two formulae, r can be obtained258.236 m. Then d is put1、d3And r2Substituting the value of (2) into the formula (3) to obtain d2＝34.236m。
3) And drawing a new ground arc according to the parameters. The drawing method comprises the following steps:
a) the projection of the center point of the double cones of the simulator on the ground is O1Point, offset from O along-z direction1Point d2To obtain O2Point; with O2Point as center of circle r258.236m is a radius, drawing a circle.
b) Cutting a circle z not more than d by a square1The right circular arc is obtained.
c) A left side circular arc is made symmetrical about z 0.
4) And respectively pulling metal wires from the bottom of the double cones of the simulator to the left side and the right side of the ground to form polar plates on two sides of the simulator, thereby obtaining the novel simulator.
Fig. 2(a) and 2(b) are distribution diagrams of electric field horizontal polarization component peaks in a region of 30m × 26.8m on a horizontal plane 3m away from the ground inside the conventional simulator and the simulator of the present invention, respectively. Comparing fig. 2(a) and fig. 2(b), it can be seen that the field uniformity inside the new simulator obtained by the present invention is better than that inside the conventional simulator.
The applicant believes that the principle of the enhancement of the field strength uniformity inside the new simulator is: after the ground arc of the simulator is bent in a certain mode, the field intensity of the inner part of the new simulator can be enhanced according to the pole plate of the new simulator formed by the ground arc pull wire, the ratio of the field intensity of the inner part of the new simulator to the field intensity of the central position is increased, and therefore the uniformity of the inner field of the simulator is improved.
The above embodiments have fully described the present disclosure, and the specific parameters of each component can be set according to actual requirements, so that those skilled in the art can sufficiently implement the present disclosure. Within the framework of the claims, any modification based on the inventive idea falls within the scope of the claims.

Claims (2)

1. A method for enhancing uniformity of field strength within a horizontally polarized bounded wave electromagnetic pulse simulator, comprising:
the shape of the polar plates on two sides of the ground of the simulator is changed into two symmetrical eccentric arcs from two parallel straight lines with equal length; the arc length of the eccentric arc is equal to the length w of the parallel straight line, and the projection of the center point of the double cone of the simulator on the ground is set as O1Point, through O1The coordinate axis of the point perpendicular to the parallel straight line is marked as z-axis and passes through O1The coordinate axis which is point and parallel to the parallel straight line is marked as an x axis, the symmetric axis of the two symmetrical eccentric circular arcs is the x axis, and the opening size d formed by the end parts of the two symmetrical eccentric circular arcskThe range of the eccentric arcs is equivalent to the range of the test area in the z direction, and the respective centers of the eccentric arcs on the left side and the right side are respectively positioned on the Z axis O1Right and left sides of the point;
and respectively pulling metal wires from the bottom of the double cones of the simulator to the two symmetrical eccentric arcs on the ground to form polar plates on two sides of the simulator, so as to obtain the simulator with enhanced field intensity uniformity.
2. The method of claim 1, wherein the position and shape of the two symmetric off-center arcs are determined by:
the shape of a polar plate on the ground of a conventional simulator is set as two parallel left/right straight lines with equal length, the length of the two straight lines is w, and the distance between the two straight lines is d; the eccentric circular arc is tangent to the corresponding parallel straight line at the z-axis, wherein the radius of the right eccentric circular arc is recorded as r2The half of the projection length of the right eccentric arc on the x axis is recorded as L, and the center position O of the right eccentric arc2The point deviates from O in the-z direction1Point d2The distance of (d) is such that the mouth opening size d of the simulator after deformationkThe same range as the test area in the z direction is taken as d3＝dk2, then r2The following two equations are used:
r2·2·atan[L/(r2-d3)]＝w
Figure FDA0002795345830000011
and d2＝r2-d/2。
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CN105206925A (en) * 2015-09-29 2015-12-30 中国舰船研究设计中心 Horizontal polarization nuclear electromagnetic pulse simulator antenna
CN208421091U (en) * 2018-06-20 2019-01-22 西安交通大学 A kind of Bounded-wave Simulator of taper-arc transition

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JP6627307B2 (en) * 2015-07-24 2020-01-08 大同特殊鋼株式会社 Manufacturing method of sintered magnet

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CN102636702A (en) * 2012-04-25 2012-08-15 中国人民解放军理工大学 Bounded-wave electromagnetic pulse simulator of elliptic arc transition section
CN105206925A (en) * 2015-09-29 2015-12-30 中国舰船研究设计中心 Horizontal polarization nuclear electromagnetic pulse simulator antenna
CN208421091U (en) * 2018-06-20 2019-01-22 西安交通大学 A kind of Bounded-wave Simulator of taper-arc transition

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