CN113075478B - Calculation model of vertical polarization EMP radiation wave simulator radiation field and construction method thereof - Google Patents
Calculation model of vertical polarization EMP radiation wave simulator radiation field and construction method thereof Download PDFInfo
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Abstract
The invention relates to a calculation model of a vertical polarization EMP radiation wave simulator radiation field and a construction method thereof, which solve the technical index problem that neither the half-width nor the rising edge of the simulator radiation field obtained by calculation of a preliminary calculation model meets the IEC-61000-4-25 standard, and simultaneously solve the problems that the time domain waveform of the simulator radiation field obtained by calculation of the preliminary calculation model has obvious oscillation superposition phenomenon and possibly has obvious double peaks. The invention mainly designs the conduction column parameters in the calculation model, adopts proper conduction column conduction delay time and proper conduction column conductivity change expression, so that when the calculation model is adopted for calculation, the half-width and the rising edge of the calculated simulator radiation field simultaneously meet the technical index requirements set forth by IEC-61000-4-25 standard, and the time domain waveform of the calculated simulator radiation field does not have oscillation superposition phenomenon and double peak phenomenon after the peak value.
Description
Technical Field
The invention relates to a calculation model of a radiation field of a vertical polarization EMP radiation wave simulator, in particular to a calculation model of a radiation field of a vertical polarization electromagnetic pulse radiation wave simulator, which is integrated with a peaking capacitor, and a construction method thereof, wherein the radiation field meets IEC-61000-4-25 standard.
Background
Vertical polarized electromagnetic pulse (electromagnetics pulse, EMP) radiation wave simulators (Zhu Xiangqin et al published in journal of computational physics, 2019, volume 36, pages 349-356, "parallel FDTD simulation of discrete resistance loaded large vertical polarized EMP radiation wave simulators"; blackburn R F et al published in IEEE tran.on Electromagnetic Compatibility, journal 1978, EMC-20, volumes 240-247, "On the Electromagnetic Fields from a Hybrid Type of EMP Simulator") have been extensively studied for providing a vertical polarized electromagnetic pulse environment for EMP effects and reinforcement measures. In the vertical polarization of EMP radiation waveIn the engineering implementation of the simulator, a feeding part of the simulator usually adopts a primary or secondary pulse compression technical scheme, and a peaking capacitor is one of key devices of pulse compression. In view of the withstand voltage requirement of the peaking capacitor and in order to reduce the inductance of the discharge loop during discharge and simultaneously reduce the discontinuous section of the single cone antenna, coaxial peaking capacitors having a multilayer thin film structure are generally designed integrally with the single cone antenna (BAILEY V et al, journal of IEEE trans. Plasma Science, 2010, volume 38, pages 2555-2556, "A6-MV pulser to drive horizontally polarized EMP simulators"). Currently, in the theoretical simulation research of the radiation field of the vertical polarization EMP radiation wave simulator integrated with the peaking capacitor, an ideal conduction column is mainly adopted to replace a calculation model of an output switch (Zhu Xiangqin and the like published in the journal of modern application physics, volume 11, 030501-8, the preliminary simulation research of the radiation field of the vertical polarization EMP radiation wave simulator with the peaking capacitor, and the paper Influence of the peaking capacitor with different inner core on the radiating-field of a biconical antenna published in 2019IEEE 2nd International Conference on Electronic Information and Communication Technology (ICEICT 2019) by CHEN Z Q and the like). According to the preliminary calculation model of Zhu Xiangqin et al and CHEN Z Q et al, however, the conduction delay time of the conducting column is made to coincide with the time at which the excitation source reaches the peak value, and the conductivity of the conducting column is made to linearly increase to the conductivity of the ideal metal conductor within 1ns (about 3.7x10 10 S/m), the half-width and rising edge of the calculated simulator radiation field do not meet the technical index requirements of half-width (23+ -5 ns) and rising edge (2.5+ -0.5) ns) proposed by IEC-61000-4-25 standard (Electromagnetic Compatibility (EMC) -Part 4-23:Testing and measurement techniques-Test methods for protective devices for HEMP and other radiated disturbances, IEC61000-4-25:31, 2001), and obvious oscillation superposition phenomenon (Zhu Xiangqin et al published in volume 030501-8 of the journal 2020 of modern application physics, "vertical polarization EMPEMP containing peaking capacitor" appears after the time domain waveform peak of the calculated radiation fieldFIG. 5 of a preliminary simulation study "of the radiation field of a radiation wave simulator; FIG. 6 of the paper "Influence of the peaking capacitor with different inner core on the radiating-field of a biconical antenna" published by CHEN Z Q et al at 2019IEEE 2nd International Conference on Electronic Information and Communication Technology (ICEICT 2019) conference. In addition, the temporal waveform of the radiation field may also exhibit a significant "double peak" (FIG. 6 of the paper "Influence of the peaking capacitor with different inner core on the radiating-field of a biconical antenna" published by CHEN Z Q et al at 2019IEEE 2nd International Conference on Electronic Information and Communication Technology (ICEICT 2019) conference). Therefore, there is a need for improvements to the preliminary computational model proposed by Zhu Xiangqin et al, CHEN Z Q et al. However, no report is reported at home and abroad.
Based on the current research on the calculation model of the vertical polarization EMP radiation wave simulator integrated with the peaking capacitor, the person skilled in the art generally linearly increases the conductivity of the conducting column to the ideal metal conductor conductivity (about 3.7X10) 10 S/m) to make improvements to the computational model. However, the half-width and the rising edge of the obtained simulator radiation field still cannot meet the technical index requirements of "(23+/-5) ns" and "(2.5+/-0.5) ns" proposed by the IEC-61000-4-25 standard; and the phenomenon of obvious oscillation superposition of the calculated time domain waveform of the simulator radiation field after the peak value and the phenomenon of 'double peak' possibly occurring in the calculated time domain waveform of the radiation field cannot be avoided.
Disclosure of Invention
The invention aims to provide a radiation field calculation model of a vertical polarization EMP radiation wave simulator with a radiation field meeting IEC-61000-4-25 standard and a construction method thereof, which solve the technical index problems that the half-width and rising edge of the radiation field of the simulator are not met with "(23+/-5) ns and" (2.5+/-0.5) ns "proposed by the IEC-61000-4-25 standard by calculating through an existing preliminary calculation model, and meanwhile solve the obvious oscillation superposition phenomenon of the time domain waveform of the radiation field of the simulator after the peak value by calculating through the existing preliminary calculation model and the obvious double-peak phenomenon possibly appearing in the time domain waveform of the radiation field of the simulator by calculating. The invention mainly designs the conduction column parameters in the calculation model, adopts proper conduction column conduction delay time and proper conduction column conductivity change expression, so that when the calculation model is adopted for calculation, the half-width and rising edge of the calculated simulator radiation field respectively meet the technical index requirements of "(23+/-5) ns" and "(2.5+/-0.5) ns" proposed by IEC-61000-4-25 standard, and the calculated time domain waveform of the simulator radiation field does not have oscillation superposition phenomenon and the calculated time domain waveform of the radiation field does not have double peak phenomenon after the peak value, thereby achieving the effect of effectively calculating the radiation field of the vertical polarization EMP radiation wave simulator integrated with the peaking capacitor.
The conception of the invention is as follows:
taking into consideration that the main factors influencing the half-width and rising edge of the radiation field of the simulator in the practical experimental model are the time for starting discharge of the output switch and the time for conducting the output switch, and taking into consideration that the conductivity of the conducting column is less than 10 during analog calculation 2 When the value is taken in the magnitude range, the conduction performance of the conduction column can be obviously different from that of an ideal metal conductor, the invention ensures that the conduction delay time of the conduction column is basically consistent with the time of reaching the peak value of the electromagnetic wave which is the same as the waveform of a voltage source and is directly reached to the conduction column at the tip of the simulator from the plane of an excitation source, and the conductivity of the conduction column is linearly increased to 10 within the time range of 2.0ns at the fastest rising edge corresponding to the technical index of (2.5+/-0.5) ns) rising edge proposed by the IEC-61000-4-25 standard 2 Conductivity expression of the order of magnitude.
Compared with the simulation results of the preliminary calculation model proposed by Zhu Xiangqin et al and CHEN Z Q et al, the invention ensures that the half-width and rising edge of the radiation field of the simulator are about 18 ns-19 ns and 2.2ns respectively on the basis of not increasing the calculation amount, ensures that the half-width and rising edge of the radiation field of the simulator simultaneously meet the technical index requirements proposed by the IEC-61000-4-25 standard, and simultaneously ensures that the calculated time domain waveform of the radiation field of the simulator does not have obvious oscillation superposition phenomenon after the peak value and the calculated time domain waveform of the radiation field does not have 'double peak'.
The technical scheme of the invention is to provide a calculation model of a radiation field of a vertical polarization EMP radiation wave simulator, wherein the radiation field meets IEC-61000-4-25 standard, and the vertical polarization EMP radiation wave simulator and a peaking capacitor are designed integrally;
the special feature is that: the coaxial peaking capacitor comprises a single cone, a coaxial peaking capacitor which is integrated with the single cone and comprises a multilayer film structure, a metal bottom plate which is positioned below the tip of the single cone and is infinitely large, a conducting column which is positioned between the tip of the single cone and the metal bottom plate and is vertical to the metal bottom plate, and an excitation source plane which is arranged inside the single cone and is positioned above the coaxial peaking capacitor;
wherein:
the excitation source plane is used for loading a voltage source, the time domain waveform (voltage source waveform for short) of the voltage source is obtained by simulating an equivalent circuit of the whole vertical polarization EMP radiation wave simulator integrated with a peaking capacitor, and in the simulation process, the half-width and the rising edge of the radiation field of the vertical polarization EMP radiation wave simulator are set to simultaneously meet the technical index requirements of "(23+/-5) ns" and "(2.5+/-0.5) ns" proposed by IEC-61000-4-25 standard respectively;
the conduction column is used for replacing the output switch, and the conduction delay time t of the conduction column d The time of reaching the peak value is consistent with the time of reaching the peak value of the electromagnetic wave which is the same as the voltage source waveform and directly reaches the single-cone tip conducting column from the excitation source plane;
the conductivity model σ (t) of the conducting pillars satisfies: in the range of 2.0ns corresponding to the fastest rising edge of the radiation field of the vertical polarization EMP radiation wave simulator which is integrated with the peaking capacitor and is proposed by the IEC-61000-4-25 standard, the conductivity of the conducting column is linearly increased to 10 2 Magnitude.
Further, the conduction delay time of the conduction columnt d Time t of peak of voltage source waveform loaded on excitation source plane v Distance H between excitation source plane and metal bottom plate s The determination is as follows:
i.e. t d ＝t v +t q +a, where t q ＝H s C, c is the speed of light in vacuum; a is an error parameter, which may be 0 to 0.5ns.
Further, the conductivity model σ (t) of the conductive column is:
wherein t is the calculation time, and the initial value of t is the same as the initial time of loading a voltage source on the plane of the excitation source; t is t r The vertical polarization EMP radiation wave simulator integrated with the peaking capacitor is proposed for IEC-61000-4-25 standard, and the time corresponding to the fastest rising edge of the radiation field of the vertical polarization EMP radiation wave simulator is 2.0ns, t d And t r Are ns; k= (6.2 ns/t) r ) +b, b being the error parameter, b being preferably from 0 to 0.1, k being in S/m.
The invention also provides a construction method of the calculation model of the vertical polarized EMP radiation wave simulator radiation field, which is characterized by comprising the following steps:
step 1, determining a calculation model structure;
the design calculation model is composed of a single cone, a coaxial peaking capacitor integrated with the single cone and containing a multilayer film structure, an infinitely large metal bottom plate positioned below the tip of the single cone, and a conducting column positioned between the tip of the single cone and the metal bottom plate and vertical to the metal bottom plate;
step 1.2, arranging an excitation source plane in the single cone and above the coaxial peaking capacitor, wherein the distance between the excitation source plane and the metal bottom plate is H s ；
Step 2, determining design parameters of a calculation model:
in the calculation model, a conduction column model is used for replacing an output switch, and the conduction delay time of a conduction column is introducedt d The simulation of the discharge process before and after the output switch is conducted in the experiment is realized. Wherein the turn-on delay time t d Time t at which the peak is reached by the voltage source waveform applied to the plane of the excitation source v Distance H between excitation source plane and metal bottom plate s The conductivity σ of the conductive pillars is determined to vary with time.
The specific parameter determination process is as follows:
step 2.1, a voltage source waveform loaded on an excitation source plane is obtained by simulating an equivalent circuit of the whole vertical polarization EMP radiation wave simulator integrated with a peaking capacitor, and in the simulation process, the half-width and the rising edge of a radiation field of the vertical polarization EMP radiation wave simulator are set to simultaneously meet the "(23+/-5) ns 'and" (2.5+/-0.5) ns' technical index requirements proposed by IEC-61000-4-25 standard respectively;
step 2.2, in order to make the half-width of the radiation field of the vertical polarization EMP radiation wave simulator integrated with the peaking capacitor meet the technical index requirement, the conduction delay time t of the conduction column d The time of reaching the peak value is consistent with the time of reaching the peak value of the electromagnetic wave which is the same as the voltage source waveform and directly reaches the single-cone tip conducting column from the excitation source plane;
so that the rising edge of the radiation field of the vertical polarization EMP radiation wave simulator integrated with the peaking capacitor is at least t r Wherein t is r The time corresponding to the fastest rising edge of the radiation field of the vertical polarization EMP radiation wave simulator of the 'integrated with the peaking capacitor' proposed for IEC-61000-4-25 standard is 2.0ns, and the conductivity model sigma (t) of the conducting column meets the following conditions: the vertical polarization EMP radiation wave simulator integrated with the peaking capacitor proposed in IEC-61000-4-25 standard has the time (t) corresponding to the fastest rising edge of the radiation field r =2.0 ns), the conductivity of the conductive column increases linearly to 10 2 Magnitude.
Further, in step 2.2: setting the conduction delay time t of the conduction column d About "time t at which the waveform of the voltage source applied to the plane of the excitation source peaks v The AND voltage source starts from the plane of the excitation source and reaches the conducting column at the fastest speedTime t required q "sum, i.e. t d ＝t v +t q +a, where t q ＝H s C, c is the speed of light in vacuum; a is an error parameter, which may be 0 to 0.5ns.
Further, in step 2.2: let the conductivity model of the conducting column be the conductivity model sigma (t) of the conducting column as:
wherein t is the calculation time, and the initial value of t is the same as the initial time of loading a voltage source on the plane of the excitation source; t is t r The time corresponding to the fastest rising edge of the radiation field of the vertical polarization EMP radiation wave simulator of the 'integrated with the peaking capacitor' proposed for IEC-61000-4-25 standard is 2.0ns; t, t d And t r Are ns; k= (6.2 ns/t) r ) +b, b being the error parameter, b being preferably from 0 to 0.1, k being in S/m.
The calculation is performed by adopting the calculation model of the vertical polarization EMP radiation wave simulator integrated with the peaking capacitor, the half-width and the rising edge of the radiation field of the vertical polarization EMP radiation wave simulator integrated with the peaking capacitor can simultaneously meet the technical index requirements of "(23+/-5) ns" and "(2.5+/-0.5) ns" proposed by the IEC-61000-4-25 standard, and the time domain waveform of the radiation field does not have obvious oscillation superposition phenomenon after the peak value and the time domain waveform of the radiation field does not have "double peaks".
The beneficial effects of the invention are as follows:
(1) The conduction delay time of the conduction column in the calculation model is determined by adopting the time of reaching the peak value of the voltage source waveform loaded on the excitation source plane and the time of reaching the conduction column at the highest speed of the voltage source from the excitation source plane, so that the half-width of the radiation field meets the technical index requirement of (23+/-5) ns proposed by the IEC-61000-4-25 standard, and the radiation field of the vertical polarization EMP radiation wave simulator integrated with the peaking capacitor does not have the phenomenon of double peaks.
(2) Through the special model design of the conductivity of the conducting column, the rising edge of the radiation field of the vertical polarization EMP radiation wave simulator integrated with the peaking capacitor meets the technical index requirement of "(2.5+/-0.5) ns" proposed by the IEC-61000-4-25 standard.
(3) Compared with the past calculation model, the invention considers the influence of the conduction delay time of the conduction column and the conductivity of the conduction column on the radiation field of the vertical polarization EMP radiation wave simulator integrated with the peaking capacitor, so that the vertical polarization EMP radiation wave simulator integrated with the peaking capacitor obtained by simulation according to the invention has the advantages that the half-width and the rising edge meet the technical index requirements of "(23+/-5) ns and" (2.5+/-0.5) ns "proposed by the IEC-61000-4-25 standard, the time domain waveform of the radiation field has no obvious oscillation superposition phenomenon after the peak value, and the time domain waveform of the radiation field has no 'double peak'.
(4) The construction method of the calculation model is not influenced by the total number of insulating medium thin films forming the peaking capacitor integrated with the single cone.
(5) In accordance with the principles of the present invention, it is contemplated that the present invention is equally applicable when the dimensional parameters of a vertically polarized EMP radiation wave simulator "integrated with a peaking capacitor" are varied.
Drawings
FIG. 1 is a schematic diagram of the computational model of the radiation field of the vertical polarized EMP radiation wave simulator of the present invention "integrated with peaking capacitors".
In the figure, 1-single cone (also called as "single cone"), 2-multi-layer insulating medium films, 3-coaxial peaking capacitors, 4-metal bottom plates, 5-excitation source planes and 6-conducting columns, wherein H is the height of the single cone forming the simulator; alpha c Is a half cone angle of a single cone; h s Is the height of the excitation source plane.
Fig. 2 is a time domain waveform of a voltage source loaded on an excitation source plane in order to enable the half-width and rising edge of a radiation field of a simulator to simultaneously meet the "(23±5) ns" and "(2.5±0.5) ns" technical index requirements proposed by the IEC-61000-4-25 standard respectively, and the time domain waveform is obtained by simulation of an equivalent circuit of the whole vertical polarization EMP radiation wave simulator integrated with a peaking capacitor.
Fig. 3 (a) is a comparison of a point a (6.5,0,0) m electric field Z component time domain waveform obtained by simulation of a preliminary calculation model of Zhu Xiangqin et al and CHEN Z Q et al in the practice of the present invention when "the total number of layers of insulating dielectric thin films constituting the coaxial peaking capacitor is 18 layers".
Fig. 3 (B) is a comparison of the B-point (9,0,0) m electric field Z-component time domain waveforms obtained by simulation of the preliminary calculation models of Zhu Xiangqin et al and CHEN Z Q et al, in the case where the total number of layers of the insulating dielectric thin films constituting the coaxial peaking capacitor is 18 layers.
Fig. 4 is a waveform of the z-component of the electric field at points a (6.5,0,0) m and B (9,0,0) m obtained in the example of the present invention when the total number of layers of the insulating dielectric thin films constituting the coaxial peaking capacitor is 13 layers.
Detailed Description
In order to ensure that the half-width and rising edge of a radiation field of the vertical polarization EMP radiation wave simulator integrated with a peaking capacitor can simultaneously meet the requirements of "(23+/-5) ns" and "(2.5+/-0.5) ns" technical indexes proposed by IEC-61000-4-25 standard respectively, the time domain waveform of the radiation field does not have obvious oscillation superposition phenomenon after the peak value, and the time domain waveform of the radiation field does not have 'double peaks', under the condition of ensuring that the calculated amount of the model is not increased, the invention adopts a special calculation model comprising specific conduction column conduction delay time and a corresponding conduction column conductivity model. The invention will be further illustrated by way of example with reference to the accompanying drawings.
In this embodiment, the calculation model structure of the vertical polarization EMP radiation wave simulator provided with "integrated with peaking capacitor" mainly comprises a single cone 1, a coaxial peaking capacitor 3 integrated with single cone "and comprising a multilayer insulating dielectric film 2, and an infinite metal base plate 4. Inside the single cone 1 and above the coaxial peaking capacitor 3, an excitation source plane 5 is provided. A conducting post 6 which is vertical to the metal bottom plate 4 is arranged between the tip of the single cone 1 and the metal bottom plate 4. The figure 1 shows theSchematic of the computational model. In the figure, the height h= 7.200m of the single cone 1 constituting the simulator; half cone angle alpha of single cone 1 c =32°; the total number of layers of the insulating medium film 2 constituting the coaxial peaking capacitor is 18 or 13; height H of excitation source plane 5 s =2.063 m. FIG. 2 is a time domain waveform of a voltage source loaded on an excitation source plane for enabling the half-width and rising edge of a radiation field of a simulator to simultaneously meet the technical index requirements of "(23+ -5) ns" and "(2.5+ -0.5) ns" proposed by IEC-61000-4-25 standard respectively in the embodiment of the invention, which is obtained by simulation of an equivalent circuit of the whole electromagnetic pulse simulator; the rising edge of the excitation source is about 34.670ns, and the peak value corresponds to 49.662ns. Conduction delay time t of conduction column d The time of reaching the peak value is consistent with the time of electromagnetic waves which are the same as the time domain waveform of a voltage source and directly reach the single-cone tip conducting column from the plane of the excitation source; the conductivity model σ (t) of the conducting pillars satisfies: in the range of 2.0ns corresponding to the fastest rising edge of the radiation field of the vertical polarization EMP radiation wave simulator which is integrated with the peaking capacitor and is proposed by the IEC-61000-4-25 standard, the conductivity of the conducting column is linearly increased to 10 2 Magnitude.
The specific construction process of the calculation model is as follows:
(1) The calculation model of the vertical polarization EMP radiation wave simulator with integrated peaking capacitor consists of a single cone integrated with the peaking capacitor and an infinite metal bottom plate below the single cone.
(2) In the calculation model, an excitation source plane is arranged inside the single cone and above the peaking capacitor, and the distance H between the excitation source plane and the metal bottom plate is equal to the distance H between the excitation source plane and the metal bottom plate s =2.063 m. The time domain waveform of the voltage source loaded on the excitation source plane is shown in fig. 2, the time domain waveform is obtained through the simulation of an equivalent circuit of the whole electromagnetic pulse simulator, and the half-width and the rising edge of the radiation field are set during the simulation of the equivalent circuit and simultaneously meet the technical index requirements of "(23+/-5) ns" and "(2.5+/-0.5) ns" proposed by the IEC-61000-4-25 standard respectively. At this time, the rising edge of the radiation field of the simulator is required to be at least 2.0ns.
(3)In the calculation model, a conduction column model which is positioned between the single cone tip and the metal bottom plate below the single cone tip and is perpendicular to the metal bottom plate is used for replacing an output switch, and the conduction delay time t of a conduction column is introduced d The simulation of the discharge process before and after the output switch is conducted in the experiment is realized. Wherein, the conduction delay time t of the conduction column d The time of reaching the peak value of the electromagnetic wave which is the same as the time domain waveform of the voltage source and directly reaches the single-cone tip conducting column from the plane of the excitation source is consistent with that of the electromagnetic wave which is the same as the time domain waveform of the voltage source, namely t d Time t at which the time-domain waveform of the voltage source applied to the plane of the excitation source peaks v Distance H between excitation source plane and metal bottom plate s The determined; the conductivity sigma of the conducting column changes with time, and the conductivity model sigma (t) needs to satisfy: in the range of 2.0ns corresponding to the fastest rising edge of the radiation field of the vertical polarization EMP radiation wave simulator which is integrated with the peaking capacitor and is proposed by the IEC-61000-4-25 standard, the conductivity of the conducting column is linearly increased to 10 2 Magnitude.
Specific model design parameters in this embodiment are:
(a) In order to enable the half-width of the radiation field of the vertical polarization EMP radiation wave simulator integrated with the peaking capacitor to meet the technical index requirement of "(23+/-5) ns", the conduction delay time t of the conduction column is set d About "time t at which the time-domain waveform of the voltage source applied to the plane of the excitation source peaks v And the time t required for the voltage source to reach the conducting column at the fastest speed from the excitation source plane q "sum, i.e. t d ＝t v +t q +a, where t q ＝H s C, c is the speed of light in vacuum; a is an error parameter, which may be 0 to 0.5ns. In the present embodiment, consider t v ＝49.662ns、H s The conduction delay time t of the conduction column is set to be 2.063m and a=0.462 ns d ＝56.538ns。
(b) So that the rising edge of the radiation field of the vertical polarization EMP radiation wave simulator integrated with the peaking capacitor is at least t r The conductivity model of the conducting column is as follows:
considering that the fastest rising edge corresponding to the technical index of rising edge "(2.5+ -0.5) ns" proposed by IEC-61000-4-25 standard is 2.0ns, t is taken from the above description r =2.0 ns. In addition, considering that the conductivity of the conducting column is linearly increased to 10 within the range of 2.0ns corresponding to the time corresponding to the fastest rising edge of the radiation field of the vertical polarized EMP radiation wave simulator of the "integrated with peaking capacitor" proposed by IEC-61000-4-25 standard 2 Magnitude, i.e. let k= (6.2 ns/t r ) +b, b is an error parameter, which may be 0 to 0.1, and k is in S/m. In this embodiment, b=0.1 is set, so k=3.2S/m.
When the calculation is performed according to the calculation model of the radiation field of the vertical polarization EMP radiation wave simulator integrated with the peaking capacitor formed in (1) to (3) to obtain that the total number of layers of the insulating medium films forming the coaxial peaking capacitor is 18 layers, the time domain waveforms of the radiation fields of the vertical polarization EMP radiation wave simulator integrated with the peaking capacitor at the measuring points a (6.5,0,0) m and B (9.5,0,0) m are shown in fig. 3 (a) and 3 (B), respectively, and the peak values, the half-height widths and the rising edges of the corresponding two measuring point fields are shown in table 1, respectively. By way of comparison, simulation results of the preliminary calculation models of Zhu Xiangqin et al and CHEN Z Q et al are given in the figures and tables.
TABLE 1
As can be seen from fig. 3 (a), fig. 3 (B) and table 1, when the total number of layers of insulating medium films forming the coaxial peaking capacitor is 18, the half-width and rising edge of the radiation field of the measuring point a and the measuring point B obtained by calculation by adopting the simulator disclosed by the invention simultaneously meet the technical index requirements of "(23±5) ns" and "(2.5±0.5) ns" proposed by the IEC-61000-4-25 standard respectively, and no obvious oscillation superposition occurs after the peak value of the radiation field time domain waveforms of the two measuring points, and no "double peak" phenomenon occurs in the radiation field time domain waveforms of the two measuring points; the half-width and rising edge of the radiation field of the measuring point A and the measuring point B, which are calculated according to the preliminary calculation models of Zhu Xiangqin et al and CHEN Z Q et al, not only do not meet the technical index requirements, but also obvious oscillation superposition occurs after the peak values of the time domain waveforms of the radiation field of the two measuring points, and the time domain waveform of the radiation field of the measuring point B also has obvious double-peak phenomenon. Thereby illustrating the effectiveness of the present invention.
Meanwhile, the construction method of the calculation model is not influenced by the total number of insulating medium thin films forming the peaking capacitor integrated with the single cone. As shown in FIG. 4, when the total number of insulating medium films forming the peaking capacitor is 13, the half-width and rising edge of the vertical polarization EMP radiation wave simulator integrated with the peaking capacitor calculated by the invention are respectively 18.88ns and 2.25ns at the measuring point A (6.5,0,0) m, and the half-width and rising edge of the radiation field at the measuring point B (9.5,0,0) m are respectively 18.88ns and 2.30ns, namely, the half-width and rising edge of the radiation fields at the two measuring points both meet the technical index requirements of "(23+ -5) ns" and "(2.5+ -0.5) ns" proposed by the IEC-61000-4-25 standard; and after the time domain waveform peak values of the radiation fields of the two measuring points, obvious oscillation superposition does not appear, and the time domain waveform of the radiation fields does not have a double peak phenomenon.
The description of the present invention has been provided for full illustration, and specific parameters of each component can be set according to actual needs, so that those skilled in the art can implement the description of the present invention. Any modification based on the idea of the invention falls within the scope of the claims of the invention.
Claims (3)
1. The construction method of the calculation model of the vertical polarization EMP radiation wave simulator radiation field is characterized by comprising the following steps:
step 1, determining a calculation model structure;
the calculation model of the vertical polarization EMP radiation wave simulator radiation field comprises a single cone (1), a coaxial peaking capacitor (3) which is integrated with the single cone (1) and comprises a multilayer insulating medium film (2), an infinite metal bottom plate (4) positioned below the tip of the single cone (1), a conducting column (6) positioned between the tip of the single cone (1) and the metal bottom plate (4) and vertical to the metal bottom plate (4), and an excitation source plane (5) which is arranged inside the single cone (1) and positioned above the coaxial peaking capacitor (3);
wherein:
the excitation source plane (5) is used for loading a voltage source, the time domain waveform of the voltage source is called as a voltage source waveform, the voltage source waveform is obtained by simulating an equivalent circuit of the whole vertical polarization EMP radiation wave simulator, and in the simulation process, the half-width and the rising edge of the radiation field of the vertical polarization EMP radiation wave simulator are set to simultaneously meet the technical index requirements of 23ns plus or minus 5ns and 2.5ns plus or minus 0.5ns respectively proposed by the IEC-61000-4-25 standard;
the conduction column (6) is used for replacing an output switch, and the conduction delay time t of the conduction column (6) d The time of reaching the peak value is consistent with the time of reaching the electromagnetic wave which is the same as the voltage source waveform and directly reaches the position of the single cone (1) tip conducting column (6) from the excitation source plane (5);
the conductivity model sigma (t) of the conducting column (6) satisfies: in the range of 2.0ns corresponding to the fastest rising edge of the radiation field of the vertical polarization EMP radiation wave simulator which is integrated with the peaking capacitor and is proposed by the IEC-61000-4-25 standard, the conductivity of the conducting column (6) is linearly increased to 10 2 Magnitude of magnitude;
the design calculation model is composed of a single cone, a coaxial peaking capacitor integrated with the single cone and containing a multilayer film structure, an infinitely large metal bottom plate positioned below the tip of the single cone, and a conducting column positioned between the tip of the single cone and the metal bottom plate and vertical to the metal bottom plate;
step 1.2, arranging an excitation source plane in the single cone and above the coaxial peaking capacitor, wherein the distance between the excitation source plane and the metal bottom plate is H s ；
Step 2, determining design parameters of a calculation model:
step 2.1, a voltage source waveform loaded on an excitation source plane is obtained by simulating an equivalent circuit of the whole vertical polarization EMP radiation wave simulator integrated with a peaking capacitor, and in the simulation process, the half-width and the rising edge of a radiation field of the vertical polarization EMP radiation wave simulator are set to simultaneously meet the technical index requirements of 23ns plus or minus 5ns and 2.5ns plus or minus 0.5ns respectively proposed by IEC-61000-4-25 standard;
step 2.2 conduction delay time t of the conduction column d The time of reaching the peak value is consistent with the time of reaching the peak value of the electromagnetic wave which is the same as the voltage source waveform and directly reaches the single-cone tip conducting column from the excitation source plane;
the conductivity model σ (t) of the conducting pillars satisfies: in the range of 2.0ns corresponding to the fastest rising edge of the radiation field of the vertical polarization EMP radiation wave simulator which is integrated with the peaking capacitor and is proposed by the IEC-61000-4-25 standard, the conductivity of the conducting column is linearly increased to 10 2 Magnitude.
2. The method for constructing a radiation field calculation model of a vertical polarized EMP radiation wave simulator according to claim 1, wherein in step 2.2:
conduction delay time t of conduction column d Time t at which the peak is reached by the voltage source waveform applied to the plane of the excitation source v Distance H between excitation source plane and metal bottom plate s The determination is as follows:
i.e. t d ＝t v +t q +a, where t q ＝H s C, c is the speed of light in vacuum; a is an error parameter, and the value is 0-0.5 ns.
3. The method for constructing a calculation model of a radiation field of a vertical polarized EMP radiation wave simulator according to claim 1 or 2, wherein the conductivity model σ (t) of the conducting column is:
wherein t is the calculation time, and the initial value of t is the same as the initial time of loading a voltage source on the plane of the excitation source; t is t r Proposed AND peak for IEC-61000-4-25 standardThe time corresponding to the fastest rising edge of the radiation field of the vertical polarization EMP radiation wave simulator integrating the capacitor is 2.0ns; t, t d And t r Are ns; k= (6.2 ns/t) r ) +b, b is an error parameter, b is 0 to 0.1, and k is S/m.
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