Three-coaxial testing method for bare wire of aviation airborne shielding cable
阅读说明：本技术 一种航空机载屏蔽线缆裸线的三同轴测试方法 (Three-coaxial testing method for bare wire of aviation airborne shielding cable ) 是由 张钰 代勇 于 2020-08-10 设计创作，主要内容包括：本发明提供一种航空机载屏蔽线缆裸线的三同轴测试装置包括被测线缆、金属管和连接器；所述被测线缆还包括芯线、屏蔽层、外绝缘层；所述芯线与所述连接器的铜芯焊接；所述屏蔽层通过飞线与所述连接器的外壳焊接；所述被测线缆的一端被所述金属管包裹,另一端连接所述连接器；所述屏蔽层和所述金属管构成外回路；所述芯线和所述屏蔽层构成内回路；所述金属管与所述屏蔽层在外回路近端短路,所述芯线和所述屏蔽层在内回路远端短路。本发明可以用来测试非同轴线类型的屏蔽线缆,简化被测线缆端接连接器的操作,提高测试结果一致性。(The invention provides a triaxial test device for bare wires of an aircraft-mounted shielding cable, which comprises a tested cable, a metal tube and a connector, wherein the tested cable is connected with the metal tube; the tested cable also comprises a core wire, a shielding layer and an outer insulating layer; the core wire is welded with the copper core of the connector; the shielding layer is welded with the shell of the connector through a flying wire; one end of the tested cable is wrapped by the metal pipe, and the other end of the tested cable is connected with the connector; the shielding layer and the metal pipe form an outer loop; the core wire and the shielding layer form an inner loop; the metal tube and the shielding layer are short-circuited at the near end of the outer loop, and the core wire and the shielding layer are short-circuited at the far end of the inner loop. The invention can be used for testing the non-coaxial cable type shielding cable, simplifies the operation of the tested cable end connector and improves the consistency of the test result.)
1. A triaxial test device for bare wires of aviation airborne shielding cables is characterized by comprising tested cables, a metal tube and a connector;
the tested cable also comprises a core wire, a shielding layer and an outer insulating layer;
the connector also comprises a connector shell and a connector copper core;
the core wire is welded with the copper core of the connector;
the shielding layer is welded with the connector shell through a flying wire;
one end of the tested cable is wrapped by the metal pipe, and the other end of the tested cable is connected with the connector;
the shielding layer and the metal pipe form an outer loop;
the core wire and the shielding layer form an inner loop;
the metal tube and the shielding layer are short-circuited at the near end of the outer loop,
the core wire and the shielding layer are short-circuited at the distal end of the inner loop.
2. The apparatus for testing the triaxial of bare aircraft-mounted shielded cable according to claim 1, further comprising a copper foil for wrapping the connector and the shielding layer, wherein the copper foil is used for blocking external electromagnetic waves.
3. The apparatus for testing the triaxial of the bare wire of the aircraft-mounted shielded cable according to claim 1, wherein when the core wire is a multi-core shielded wire, all the core wires of the core wire are twisted together and then soldered to the copper core of the connector.
4. The apparatus for testing the triaxial of the bare wire of the airborne shielding cable according to claim 1, wherein the distance between the short-circuit point at the proximal end of the outer loop and the short-circuit point at the distal end of the inner loop is a coupling length, and the coupling length is between 2m and 3 m.
5. The apparatus for testing the triaxial cable bare wire of an airborne shielded cable according to claim 1, wherein the connector is an N-KF connector.
6. The apparatus for testing the triaxial of bare aircraft-mounted shielded cables according to claim 1, wherein the metallic tube end of the apparatus is connected to a signal generator, and the connector end of the apparatus is connected to a frequency-selective test receiver.
7. The apparatus for testing the triaxial of bare aircraft-mounted shielded cables according to claim 1, wherein the metal tube end and the connector end of the apparatus are connected to two ports of a vector network analyzer, respectively.
Technical Field
The invention relates to the technical field of electric power, in particular to a triaxial test method for bare wires of an aviation airborne shielding cable.
Background
With the rapid development of the multi-electrical EWIS technology of the airplane, the layout of wire harnesses and cables on the airplane is more and more dense, the crosstalk between the cables becomes one of the key problems in the laying of the airplane cables, the shielding cable becomes one of the main schemes for solving the crosstalk problem, and the shielding layer of the shielding cable can not only reduce the interference of an external electromagnetic field to the cable, but also reduce the radiation influence of the cable to the outside. The shielding effectiveness is an important factor for evaluating and measuring the performance of the cable, and the transfer impedance of the shielding layer can relatively objectively reflect the cable quality of the cable, so that the transfer impedance test of the shielding cable has great significance for the crosstalk research of the airborne cable.
Disclosure of Invention
The invention aims to provide a triaxial test method for bare wires of an aviation airborne shielding cable, which realizes the test of a non-coaxial shielding cable by a triaxial method with lower cost, reduces the operation of a crimping connector and ensures the test consistency.
In order to solve the above problems, an embodiment of the present invention provides a triaxial test apparatus for bare wires of an airborne shielding cable, including a cable to be tested, a metal tube and a connector;
the tested cable also comprises a core wire, a shielding layer and an outer insulating layer;
the connector also comprises a connector shell and a connector copper core;
the core wire is welded with the copper core of the connector;
the shielding layer is welded with the connector shell through a flying wire;
one end of the tested cable is wrapped by the metal pipe, and the other end of the tested cable is connected with the connector;
the shielding layer and the metal pipe form an outer loop;
the core wire and the shielding layer form an inner loop;
the metal tube and the shielding layer are short-circuited at the near end of the outer loop,
the core wire and the shielding layer are short-circuited at the distal end of the inner loop.
Preferably, the device further comprises a copper foil for wrapping the connector and the shielding layer, wherein the copper foil is used for blocking external electromagnetic waves.
Preferably, when the core wire is a multi-core shielding wire, all the core wires of the core wire are twisted together and then welded to the copper core of the connector.
Preferably, the distance between the short-circuit point at the near end of the outer loop and the short-circuit point at the far end of the inner loop is a coupling length, and the coupling length is between 2m and 3 m.
Preferably, the connector is an N-KF connector.
Preferably, the metal pipe end of the testing device is connected with the signal generator, and the connector end of the testing device is connected with the frequency-selective testing receiver.
Preferably, the metal pipe end and the connector end of the testing device are respectively connected with two ports of a vector network analyzer.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
the invention provides a triaxial test device for bare wires of an aircraft-mounted shielding cable, which comprises a tested cable, a metal tube and a connector, wherein the tested cable is connected with the metal tube; the tested cable also comprises a core wire, a shielding layer and an outer insulating layer; the core wire is welded with the copper core of the connector; the shielding layer is welded with the shell of the connector through a flying wire; one end of the tested cable is wrapped by the metal pipe, and the other end of the tested cable is connected with the connector; the shielding layer and the metal pipe form an outer loop; the core wire and the shielding layer form an inner loop; the metal tube and the shielding layer are short-circuited at the near end of the outer loop, and the core wire and the shielding layer are short-circuited at the far end of the inner loop. The invention can be used for testing the non-coaxial cable type shielding cable, simplifies the operation of the tested cable end connector and improves the consistency of the test result.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic connection structure diagram of a triaxial test apparatus for bare wires of an airborne shielding cable according to an embodiment of the present invention;
fig. 2 is a schematic connection structure diagram of a triaxial test device for bare wires of an airborne shielding cable according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a connector in a triaxial test apparatus for bare wires of an airborne shielded cable according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a connector in a triaxial test apparatus for bare aircraft-mounted shielding cables according to another embodiment of the present invention;
fig. 5 is an experimental diagram of a test result of a triaxial test apparatus for bare aircraft-mounted shielding cables according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
Please refer to fig. 1.
The embodiment of the invention provides a triaxial test device for bare wires of an aviation airborne shielding cable, which comprises a tested cable 110, a
the tested cable 110 further comprises a core wire 111, a shielding layer 112 and an outer insulating layer 113;
the connector 130 further comprises a connector housing 132 and a connector copper core 131;
the core wire 111 is welded with the connector copper core 131;
the shielding layer 112 is welded to the connector housing 132 by flying leads;
one end of the tested cable 110 is wrapped by the
the shielding layer 112 and the
the core wire 111 and the shielding layer 112 constitute an inner loop;
the
the core wire 111 and the shielding layer 112 are short-circuited at the far end of the inner loop.
Preferably, the device further comprises a copper foil 140 for wrapping the connector 130 and the shielding layer 112, wherein the copper foil 140 is used for blocking external electromagnetic waves.
Preferably, when the core wires 111 are multi-core shielded wires, all the core wires of the core wires are twisted together and then welded to the connector copper core 131.
Preferably, the distance between the short-circuit point at the near end of the outer loop and the short-circuit point at the far end of the inner loop is a coupling length 114, and the coupling length 114 is between 2m and 3 m.
Preferably, the connector 130 is an N-KF connector. The embodiment utilizes the N-KF connector to realize the connection between the far end of the tested cable and the testing instrument, and is applicable to the tested cable no matter whether the tested cable is a coaxial cable or not. At present, the commonly used network port in the laboratory is usually an N-type port (the matching impedance is 50 omega), and most network ports can be matched by using an N-KF connector.
The N-KF connector belongs to N series joint, and N series joint installs the both ends at thick cable, and only T type connects the transceiver can use this joint. The N-series barrel-shaped joint is used for connecting two cable sections. The N series joint is a medium power connector in threaded connection, has the characteristics of high reliability, strong vibration resistance, excellent mechanical and electrical properties and the like, and is widely used for connecting radio frequency coaxial cables for radio equipment, instruments and ground transmitting systems under the conditions of vibration and severe environment.
Preferably, the metal tube end and the connector end of the testing apparatus are connected to two ports of the vector network analyzer 210, respectively.
And testing by a vector network analyzer, wherein according to the method C in the IEC62153-4-3 standard, an output end (Port1) is connected with the near end of the testing instrument, an input end (Port2) is connected with the far end of the tested cable, and the transfer impedance of the tested cable is calculated by measuring S21 parameters.
The vector network analyzer 210 is a set of radio frequency testing instruments for testing transmission and reflection parameter vectors (phase and amplitude) of various electronic, electrical and radio frequency components and equipment. The system consists of four parts, namely a signal source, a signal separation device, a receiver and a processing and display system. The network analyzer can be used for testing the loss, gain, voltage standing wave ratio, reflection coefficient, return loss, group delay and other parameters and phases of the tested piece. When the transfer impedance of the cable is tested, a network analyzer is preferably used, because the network analyzer can directly obtain the S parameter of the frequency band through frequency sweep test, the calculation is greatly simplified, and the network analyzer can remove the transmission loss of the cable for connection through calibration.
When testing cables with very small transfer impedances, it is also necessary to receive minute signals using low noise amplifiers.
Please refer to fig. 2.
The embodiment of the invention also provides a triaxial test device for bare wires of aviation airborne shielding cables, which comprises a tested cable 110, a
the tested cable 110 further comprises a core wire 111, a shielding layer 112 and an outer insulating layer 113;
the connector 130 further comprises a connector housing 132 and a connector copper core 131;
the core wire 111 is welded with the connector copper core 131;
the shielding layer 112 is welded to the connector housing 132 by flying leads;
one end of the tested cable 110 is wrapped by the
the shielding layer 112 and the
the core wire 111 and the shielding layer 112 constitute an inner loop;
the
the core wire 111 and the shielding layer 112 are short-circuited at the far end of the inner loop.
Preferably, the device further comprises a copper foil 140 for wrapping the connector 130 and the shielding layer 112, wherein the copper foil 140 is used for blocking external electromagnetic waves.
Preferably, when the core wires 111 are multi-core shielded wires, all the core wires of the core wires are twisted together and then welded to the connector copper core 131.
Preferably, the distance between the short-circuit point at the near end of the outer loop and the short-circuit point at the far end of the inner loop is a coupling length 114, and the coupling length 114 is between 2m and 3 m.
Preferably, the connector 130 is an N-KF connector.
Preferably, the metal tube end of the test apparatus is connected to a signal generator 310, and the connector end of the test apparatus is connected to a frequency selective test receiver 320.
Please refer to fig. 3 and 4.
The embodiment of the present invention also shows the specific connection manner of the connector 130 and the tested cable 110 in the form of a photo. The core wires 111 are welded with the connector copper core 131, the shielding layer 112 is welded directly at the connector shell 132 through flying leads, and for the multi-core shielding wire, all the core wires need to be twisted together and then welded at the connector copper core 131. The test environment is complicated by electromagnetic environment, and the connector 130 and the shielding layer 112 can be enclosed by the copper foil 140 to prevent external electromagnetic wave interference.
Please refer to fig. 5.
The embodiment of the invention shows the test consistency after repeated connection for many times. The testing frequency range is 0-100MHz, under the condition of ensuring good welding, the testing results after 3 times of repeated connection are basically consistent, the maximum deviation is only about 1.5m omega/m, and the method is proved to have better stability.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
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