CN113326571B - Train body electromagnetic compatibility confirmation method based on three-dimensional equivalent impedance network - Google Patents
Train body electromagnetic compatibility confirmation method based on three-dimensional equivalent impedance network Download PDFInfo
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- G—PHYSICS
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The application discloses a train body electromagnetic compatibility confirmation method based on a three-dimensional equivalent impedance network, which is characterized in that a three-dimensional equivalent impedance network is established based on the train body and attribute nodes, the attribute nodes are actually connected to different positions of the train body, then a three-dimensional network model is established based on the three-dimensional equivalent impedance network and a train body three-dimensional simulation model diagram, and then the train body electromagnetic compatibility is confirmed according to the three-dimensional network model, when the three-dimensional network model is established, the connection between an actual interference source and sensitive equipment on the train and the train body is fully considered, the connection points among a high-voltage cable, the sensitive equipment and the train body are increased, the accuracy in equivalent simulation is ensured, and therefore the accuracy of confirming the train body electromagnetic compatibility is improved.
Description
Technical Field
The application belongs to the technical field of electromagnetic compatibility simulation of a whole train, and particularly relates to an electromagnetic compatibility confirmation method of sensitive equipment based on a three-dimensional equivalent impedance network.
Background
Along with the rapid development of the intellectualization and the high speed of the train, the electromagnetic compatibility of sensitive equipment such as a vehicle-mounted sensor is improved to have higher requirements, and the train body is used as a public ground of all vehicle-mounted strong current and weak current systems, such as an interference source under too many transient working conditions of over-split phase, VCB (Vacuum circuit breaker ) operation, bow net offline, lightning stroke and the like, can enter the sensitive equipment through the coupling path of the train body, so the train body is used as an indispensable link in the electromagnetic compatibility research of the whole train.
In the prior art, the confirmation of the electromagnetic compatibility of the whole train body of the train is mainly to make the vehicle body equivalent to a two-dimensional model for determining the electromagnetic compatibility of the vehicle body, but in the prior art, when the vehicle body equivalent to the two-dimensional model, the vehicle body equivalent to a ring circuit is made, the vehicle body parameters are two parts of transverse parameters and longitudinal parameters, the vehicle body transverse direction is the direction of two side walls of the train, and the vehicle body longitudinal direction is the direction of the train roof to the underframe.
Therefore, how to improve accuracy in confirming electromagnetic compatibility of a train body is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The application aims to solve the technical problem that in the prior art, the connection of an actual interference source and sensitive equipment on a train with a train body is omitted, and the accuracy is low when the electromagnetic compatibility of the train body is confirmed.
The technical scheme of the application is as follows: the method for confirming the electromagnetic compatibility of the train body based on the three-dimensional equivalent impedance network comprises the following steps:
s1, establishing a three-dimensional equivalent impedance network based on the vehicle body and attribute nodes, wherein the attribute nodes are actually connected to different positions of the vehicle body;
s2, establishing a three-dimensional network model based on the three-dimensional equivalent impedance network and a vehicle body three-dimensional simulation model diagram;
and S3, confirming the electromagnetic compatibility of the train body according to the three-dimensional network model.
Further, the step S1 specifically includes the following sub-steps:
s11, each surface of the vehicle body is equivalent to a corresponding cross impedance network, and the cross impedance networks corresponding to the adjacent surfaces are connected according to an actual connection mode to obtain a preliminary three-dimensional equivalent impedance network;
s12, setting corresponding nodes in the preliminary three-dimensional equivalent impedance network according to the actual connection points of the attribute nodes and the vehicle body to obtain the three-dimensional equivalent impedance network, wherein the attribute nodes specifically comprise high-voltage cable grounding points, vehicle body grounding points and connection points of sensitive equipment and the vehicle body.
Further, the step S2 is specifically to determine the size of the three-dimensional equivalent impedance network according to a vehicle body three-dimensional simulation model diagram so as to establish the three-dimensional network model, and set model parameters of the three-dimensional network model.
Further, the step S2 further includes the following sub-steps:
s21, determining the equivalent impedance of the node;
s22, determining a specific value of the model parameter based on the equivalent impedance;
s23, substituting the specific value of the model parameter into the three-dimensional network model to serve as the final three-dimensional network model.
Compared with the prior art, the application has the beneficial effects that:
(1) The three-dimensional equivalent impedance network is built based on the vehicle body and the attribute node, wherein the attribute node is the high-voltage cable grounding point, the vehicle body grounding point and the connection point of the sensitive equipment and the vehicle body, then a three-dimensional network model is built based on the three-dimensional equivalent impedance network and the vehicle body three-dimensional simulation model diagram, the influence of an actual interference source on a train and the connection of the sensitive equipment and the vehicle body on the electromagnetic compatibility of the train body is fully considered by the three-dimensional network model built by the method, and the accuracy of confirming the electromagnetic compatibility of the train body is ensured.
(2) According to the application, each surface of the train body is equivalent to a corresponding cross impedance network, the corresponding cross impedance network of the adjacent surface is connected according to the actual connection mode of each surface to obtain a preliminary three-dimensional equivalent impedance network, the corresponding node is arranged in the preliminary three-dimensional equivalent impedance network according to the actual connection point of the attribute node and the train body to obtain a three-dimensional equivalent impedance network, and meanwhile, the size of the three-dimensional equivalent impedance network is determined according to the three-dimensional simulation model diagram of the train body to establish a three-dimensional network model, so that the accuracy of connection of an actual interference source on the train and sensitive equipment with the train body on the three-dimensional network model can be ensured, the influence on the confirmation of the electromagnetic compatibility of the train body of the train is avoided, and the propagation characteristics of electromagnetic compatibility problems such as transient overvoltage and the like on the train body are conveniently studied in depth.
Drawings
Fig. 1 is a schematic flow chart of a method for confirming electromagnetic compatibility of a train body based on a three-dimensional equivalent impedance network according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a preliminary three-dimensional equivalent impedance network according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a three-dimensional equivalent impedance network according to an embodiment of the present application;
fig. 4 is a schematic diagram of a three-dimensional simulation model diagram of a vehicle body according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
As described in the background art, in the prior art, electromagnetic compatibility confirmation of a train body is performed or a quadrilateral network impedance model is generally adopted to perform simple equivalence on the train body when electromagnetic compatibility simulation is performed, and the train body is equivalent to a ring circuit, so that the train body is equivalent to a two-dimensional model, only four nodes exist, connection of an actual train interference source and sensitive equipment with the train body is omitted, and accuracy is low when electromagnetic compatibility confirmation of the train body is performed.
In order to solve the defects in the prior art, the application provides a train body electromagnetic compatibility confirmation method based on a three-dimensional equivalent impedance network, as shown in fig. 1, the method comprises the following steps:
and step S1, establishing a three-dimensional equivalent impedance network based on the vehicle body and attribute nodes, wherein the attribute nodes are actually connected to different positions of the vehicle body.
The step S1 specifically comprises the following sub-steps:
s11, each surface of the vehicle body is equivalent to a corresponding cross impedance network, and the cross impedance networks corresponding to the adjacent surfaces are connected according to an actual connection mode to obtain a preliminary three-dimensional equivalent impedance network;
s12, setting corresponding nodes in the preliminary three-dimensional equivalent impedance network according to the actual connection points of the attribute nodes and the vehicle body to obtain the three-dimensional equivalent impedance network, wherein the attribute nodes specifically comprise high-voltage cable grounding points, vehicle body grounding points and connection points of sensitive equipment and the vehicle body.
Specifically, since the train body is in a cuboid structure, each surface of the train body is equivalent to a corresponding cross impedance network, and the corresponding cross impedance networks of adjacent surfaces are connected according to the actual connection mode of each surface to obtain a preliminary three-dimensional equivalent impedance network, as shown in fig. 2, in fig. 21. The nodes 2, 3, 4, 5 and 6 are the midpoints of the corresponding surfaces respectively, the impedance relation among the surfaces can be reflected, and due to the symmetry of the vehicle body, the impedance among the midpoints of the surfaces can be subjected to circuit equivalence by only determining the impedance parameters of 3 preliminary three-dimensional equivalent impedance networks, and as shown in figure 2, the impedance parameters Z are arranged among the nodes 1 and 2, the nodes 1 and 5, the nodes 2 and 6 and the nodes 6 and 5 1a +Z 2a Impedance parameters Z are arranged between the 1 node and the 3 node, between the 3 node and the 6 node, between the 6 node and the 4 node and between the 4 node and the 1 node 1b +Z 3b Impedance parameters Z are arranged between the 3 node and the 2 node, between the 2 node and the 4 node, between the 4 node and the 5 node and between the 5 node and the 3 node 3a +Z 2b ，。
And setting corresponding nodes in the preliminary three-dimensional equivalent impedance network according to the actual connection points of the attribute nodes and the vehicle body to obtain a three-dimensional equivalent impedance network with 14 nodes, wherein as shown in fig. 3, the high-voltage cable grounding points in the attribute nodes correspond to the 9 and 13 nodes in fig. 3, the vehicle body grounding points correspond to the 8 and 12 nodes in fig. 3, the connection points of the sensitive equipment and the vehicle body correspond to the 4, 8 and 12 nodes in fig. 3, the 10, 14, 7 and 11 nodes in fig. 3 are auxiliary nodes, the 8 and 12 nodes are the vehicle body grounding points, the sensitive equipment and the vehicle body connection points, the 4 nodes are the midpoint and the connection points of the sensitive equipment and the vehicle body, and the nodes in the three-dimensional equivalent impedance network can reflect the impedance relation among all the attribute nodes in the actual vehicle body structure.
And S2, establishing a three-dimensional network model based on the three-dimensional equivalent impedance network and a vehicle body three-dimensional simulation model diagram.
The step S2 is specifically to determine the size of the three-dimensional equivalent impedance network according to a vehicle body three-dimensional simulation model diagram so as to establish the three-dimensional network model, and set model parameters of the three-dimensional network model.
The step S2 further comprises the following sub-steps:
s21, determining equivalent impedance among the nodes;
s22, determining a specific value of the model parameter based on the equivalent impedance;
s23, substituting the specific value of the model parameter into the three-dimensional network model to serve as the final three-dimensional network model.
Specifically, as shown in fig. 4, a three-dimensional simulation model diagram of a vehicle body is created by the actual vehicle body structure and dimensions, and the dimensions of the three-dimensional equivalent impedance network are determined by the three-dimensional simulation model diagram of the vehicle body, so as to create a three-dimensional network model.
Because of the symmetry of the vehicle body, 6 three-dimensional equivalent impedance networks are firstly set in the three-dimensional equivalent impedance network, the impedance parameters respectively correspond to a, b, c, d, e, f in fig. 3, then circuit equivalent is carried out on the impedance between each node, wherein the impedance parameter between the 1 node and the 11 node is a, the impedance parameter between the 3 node and the 13 node is b, the impedance parameter between the 11 node and the 13 node is c, the impedance parameter between the 1 node and the 3 node is d, the impedance parameter between the 2 node and the 13 node is e, the impedance parameter between the 11 node and the 2 node is f, and the equivalent impedance between partial nodes, namely the impedance parameters of the 6 three-dimensional equivalent impedance networks, can be determined based on kirchhoff's law, and the expression of the equivalent impedance between partial nodes is as follows:
Z 8-9 ＝[(2e//c+2b)//d+2b]//c//2e (3)
Z 7-10 ＝[(2f//c+2a)//d+2a]//c//2f (4)
Z 8-12 ＝b(abc 2 +4abce+2abcf+4abe 2 +4abef+2ac 2 e+4ace 2 +4acef+2bc 2 e+bc 2 f+4bce 2 +4bcef+2c 2 e 2 +2c 2 ef)/(abc 2 +4abce+2abcf+4abe 2 +4abef+ac 2 e+2ace 2 +2acef+b 2 c 2 +4b 2 ce+2b 2 cf+4b 2 e 2 +4b 2 ef+2bc 2 e+bc 2 f+4bce 2 +4bcef+c 2 e 2 +c 2 ef) (6)
wherein Z is 3-4 Is equivalent impedance between 3 node and 4 node, Z 1-6 Is equivalent impedance between 1 node and 6 node, Z 8-9 Is equivalent impedance between 8 node and 9 node, Z 7-10 Is equivalent impedance between 7 nodes and 10 nodes, Z 2-5 Is equivalent impedance between 2 nodes and 5 nodes, Z 8-12 Is the equivalent impedance between the 8-node and the 12-node.
And obtaining a solution of each model parameter according to the simultaneous equation set of the expression. And on the other hand, constructing a three-dimensional simulation model diagram of the vehicle body according to the actual vehicle body structure, extracting the required equivalent impedance among partial nodes, substituting the equivalent impedance into the solving type of each model parameter to solve to obtain the model parameter, and substituting the model parameter into a three-dimensional network model to serve as a final three-dimensional network model.
Finally substituting the solved model parameters into the model, obtaining a current value under the three-dimensional network model and a current value among the actual attribute nodes by inputting sinusoidal voltage sources with the peak value of 100V and the frequency of 500MHz into the different nodes, and verifying the accuracy of the three-dimensional network model as shown in the following table 1:
TABLE 1
As can be seen from the above table 1, the three-dimensional network model in the application has high simulation and high accuracy.
And step S3, confirming the electromagnetic compatibility of the train body according to the three-dimensional network model.
Specifically, according to the established three-dimensional network model, the electromagnetic compatibility of the train body is confirmed, so that the electromagnetic compatibility problem of the vehicle-mounted sensitive equipment can be studied in depth.
Those of ordinary skill in the art will recognize that the embodiments described herein are for the purpose of aiding the reader in understanding the principles of the present application and should be understood that the scope of the application is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific modifications and combinations from the teachings of the present disclosure without departing from the spirit thereof, and such modifications and combinations remain within the scope of the present disclosure.
Claims (1)
1. The train body electromagnetic compatibility confirmation method based on the three-dimensional equivalent impedance network is characterized by comprising the following steps of:
s1, establishing a three-dimensional equivalent impedance network based on the vehicle body and attribute nodes, wherein the attribute nodes are actually connected to different positions of the vehicle body;
the step S1 specifically comprises the following sub-steps:
s11, each surface of the vehicle body is equivalent to a corresponding cross impedance network, and the cross impedance networks corresponding to the adjacent surfaces are connected according to an actual connection mode to obtain a preliminary three-dimensional equivalent impedance network;
s12, setting corresponding nodes in the preliminary three-dimensional equivalent impedance network according to the actual connection points of the attribute nodes and the vehicle body to obtain the three-dimensional equivalent impedance network, wherein the attribute nodes specifically comprise high-voltage cable grounding points, vehicle body grounding points and connection points of sensitive equipment and the vehicle body;
s2, establishing a three-dimensional network model based on the three-dimensional equivalent impedance network and a vehicle body three-dimensional simulation model diagram;
s2, determining the size of the three-dimensional equivalent impedance network according to a vehicle body three-dimensional simulation model diagram so as to establish the three-dimensional network model, and setting model parameters of the three-dimensional network model;
the step S2 further comprises the following sub-steps:
s21, determining the equivalent impedance of the node;
s22, determining a specific value of the model parameter based on the equivalent impedance;
s23, substituting the specific value of the model parameter into the three-dimensional network model to serve as a final three-dimensional network model;
and S3, confirming the electromagnetic compatibility of the train body according to the three-dimensional network model.
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