CN111220938A - Connection type intermittent fault simulation system - Google Patents
Connection type intermittent fault simulation system Download PDFInfo
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- CN111220938A CN111220938A CN202010106591.6A CN202010106591A CN111220938A CN 111220938 A CN111220938 A CN 111220938A CN 202010106591 A CN202010106591 A CN 202010106591A CN 111220938 A CN111220938 A CN 111220938A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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Abstract
The invention relates to a connection type intermittent fault simulation system which comprises a fault display unit, a signal receiving and transmitting device, a power supply unit, a fault simulation board, a main controller, an operation display unit and an upper computer, wherein the fault display unit is connected with the main controller; the signal receiving and transmitting device transmits a detection signal to the fault simulation board through at least one cable and receives a feedback signal sent by the fault simulation board; the fault display unit is used for displaying the state of the feedback signal; the power supply unit respectively provides corresponding power supplies for the fault simulation board and the main controller, the main controller receives a control command sent by the upper computer and transmits the control command to the fault simulation board, and the fault simulation board receives the control command sent by the main controller, converts the control command into a corresponding state signal by controlling the state of the mechanical switch and/or the electronic switch, and feeds the state signal back to the main controller; the operation display unit receives the state signal sent by the main controller and displays the state signal.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a connection type intermittent fault simulation system.
Background
When the cable is used for signal transmission, intermittent faults such as instantaneous interruption, instantaneous short and the like occur in signals in the cable due to factors such as vibration or complex environment and the like, so that normal transmission of the signals is influenced, and serious safety accidents can be caused when the intermittent faults are long in duration or occur frequently. Intermittent faults in the aviation cable are very difficult to diagnose and eliminate due to sporadic reasons, short single duration and the like. In the prior art, a cable fault location analyzer is generally adopted to detect intermittent faults occurring in a cable, but the cable fault location analyzer needs to debug and verify the detection performance before being put into use, so that a device to be tested with a connection type intermittent fault needs to be provided. However, it is difficult to provide a real intermittent fault device, and the occurrence of intermittent faults cannot be preset, so it is difficult to verify the detection performance of the cable fault location analyzer by using the real intermittent fault device.
Disclosure of Invention
The invention provides a connection type intermittent fault simulation system aiming at the technical problems in the prior art.
The technical scheme for solving the technical problems is as follows: a connection type intermittent fault simulation system is characterized by comprising a fault display unit, a signal receiving and transmitting device, a power supply unit, a fault simulation board, a main controller, an operation display unit and an upper computer; the signal transceiver is respectively and electrically connected with the fault display unit and the fault simulation board, the power supply unit is respectively and electrically connected with the fault simulation board and the main controller, the main controller is respectively and electrically connected with the fault simulation board and the operation display unit, and the upper computer is electrically connected with the main controller; the signal receiving and transmitting device transmits a detection signal to the fault simulation board through at least one cable and receives a feedback signal sent by the fault simulation board; the fault display unit is used for displaying the state of the feedback signal received by the signal transceiver; the power supply unit provides corresponding power to trouble analog board and main control unit respectively, main control unit receives the control command that the host computer sent to with control command transmission to trouble analog board, the control command that main control unit sent is received to trouble analog board to through the state of control mechanical switch and/or electronic switch, turn into corresponding state signal with control command, and feed back state signal to main control unit, the operation display element receives the state signal that main control unit sent, and show state signal through pilot lamp and/or characters.
On the basis of the technical scheme, in order to achieve the convenience of use and the stability of equipment, the invention can also make the following improvements on the technical scheme:
further, the upper computer sends a control command to the main controller according to a certain excitation period and an excitation mode, and the control command is transmitted to the fault simulation board through the main controller, so that a corresponding signal state is generated. The upper computer is provided with an operation interface which can respectively control the state of a channel where each switch is positioned, wherein the default state and the reset state are normal states; and under all fault modes, automatically converting to a normal state within two seconds after fault simulation is completed.
Further, the status signal is normal, short or open. When the status signal is "normal", the signal indicator light is green, when the status signal is "short circuit", the signal indicator light is yellow, and when the status signal is "open circuit", the signal indicator light is red. Meanwhile, the status signal can also be represented by corresponding words.
Further, the excitation mode is random excitation, single excitation or periodic excitation. The random excitation indicates that the occurrence of the fault is random and does not need to have a specific condition; the single excitation indicates that a fault can be generated according to set time; the period excitation means that periodic faults can be generated at regular time according to a set period.
Further, the excitation period includes a time period of the excitation, a number of the excitations, and a time instant of the excitation. When the fault excitation mode is single excitation, the excitation time and the fault duration time of the single excitation can be set; when the excitation mode of the fault is random excitation, the random excitation times and the fault duration time can be set; when the excitation pattern of the fault is periodic excitation, the time period of the periodic excitation, the duration of the fault and the number of the excitation can be set.
Further, the cables are coaxial lines and/or shielded lines, and the mechanical switches or the electronic switches are individually controllable and correspond to the number of the cables. An electronic switch or a mechanical switch is added on a cable for transmitting detection signals, and switching of the switch is realized through control signals, so that free conversion of three state signals of 'normal', 'open' and 'short circuit' is realized.
Furthermore, the duration time of the state signal generated by the mechanical switch is less than or equal to 50ms, and the duration time of the state signal generated by the electronic switch is less than or equal to 100 ns. The mechanical switch adopts a relay, and the electronic switch adopts a microwave switch.
The invention has the beneficial effects that: according to the pulse reflection principle, the signal transceiver transmits a detection signal through a cable, a fault simulation board is installed on the cable for transmitting the detection signal, and a mechanical or electronic switch on the fault simulation board is freely switched among a normal state, a short circuit state and an open circuit state through a control signal, so that a feedback signal transmitted to the signal transceiver by the fault simulation board is in a signal state corresponding to the feedback signal, the fault state possibly occurring in the transmission of the detection signal is simulated, an intermittent fault in the transmission of the detection signal is simulated by adjusting a trigger mode and an excitation period of the control signal, and the accuracy of detecting the intermittent fault by the signal transceiver is verified by comparing display results of a fault display unit and an operation display unit.
Drawings
FIG. 1 is a schematic diagram of a simulation system according to the present invention;
FIG. 2 is a schematic diagram of a 4-way mechanical switch;
FIG. 3 is a schematic diagram of a 1-way electronic switch;
FIG. 4 is a schematic diagram of the operation of the 1-way electronic switch;
fig. 5 is an electronic switch control logic table.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, a connection type intermittent fault simulation system is characterized by comprising a fault display unit 111, a signal transceiver 110, a power supply unit 120, a fault simulation board 130, a main controller 140, an operation display unit 150 and an upper computer 160; the signal transceiver 110 is respectively and electrically connected with the fault display unit 111 and the fault simulation board 130, the power supply unit 120 is respectively and electrically connected with the fault simulation board 130 and the main controller 140, the main controller 140 is respectively and electrically connected with the fault simulation board 130 and the operation display unit 150, and the upper computer 160 is electrically connected with the main controller 140; the signal transceiver 110 transmits the detection signal to the fault simulation board 130 through at least one cable, and receives a feedback signal sent by the fault simulation board 130; the handheld cable fault location analyzer comprises the signal transceiver 110 and a fault display unit 111, wherein the signal transceiver 110 transmits a detection signal through a cable, and the detection signal is a pulse signal; the failure display unit 111 is configured to display a state of the feedback signal received by the signal transceiver 110; when the state of the mechanical switch or the electronic switch on the fault simulation board 130 is "normal", the feedback signal displayed in the fault display unit 111 has no reflected signal; when the state of the mechanical switch or the electronic switch on the fault simulation board 130 is "open", the feedback signal displayed in the fault display unit 111 has a forward reflected signal; when the state of the mechanical switch or the electronic switch on the fault simulation board 130 is "short-circuited", the feedback signal displayed by the fault display unit 111 has a reverse reflected signal; the cable is connected to a J30J-66 connector on the fault simulation board 130 via a BNC connector or an aircraft plug, the power supply unit 120 includes an AC-DC module and a DC-DC module, to convert the voltage into the working voltage of the main controller 140 and the fault simulation board 130, the main controller 140 receives the control command sent by the upper computer 160 by using the AC7020 core board, and transmits the control command to the fault simulation board 130 through the AXI bus, the fault simulation board 130 receives the control command transmitted from the main controller 140, and converts the control command into a corresponding state signal by controlling the state of the mechanical switch and/or the electronic switch, and feeds back the status signal to the main controller 140, the operation display unit 150 receives the status signal sent from the main controller 140, i.e., the on-off state of the mechanical switch or the electronic switch on the fault simulation board 130, and displays the state signal through an indicator light and/or text.
The principle of the connection type intermittent fault simulation system is a time domain reflection method and a pulse reflection method, voltage pulses are sent to a communication cable, and a fault point is determined by utilizing the principle that the time difference between the sent pulses and the reflected pulses of the fault point is in direct proportion to the distance of the fault point.
Let the cable incident wave voltage be UiWave impedance of normal cable is Z1Fault equivalent wave impedance of Z2Travelling wave from Z1To Z2Propagating and reflecting voltage wave as UfVoltage reflection coefficient:
z at break2Infinite, short-circuited Z2Is 0. Therefore, whether the line has a fault can be determined by the existence of the reflected signal, and the fault type can be judged by the polarity of the reflected signal.
The upper computer 160 sends a control command to the main controller 140 according to a certain excitation period and excitation mode, and transmits the control command to the fault simulation board 130 through the main controller 140, so as to generate a corresponding signal state. The upper computer 160 is provided with an operation interface which can respectively control the state of the channel where each switch is located, wherein the default state and the reset state are normal states, and the state is automatically converted into the normal state within two seconds after the fault simulation is completed.
The status signal is normal, short or open. When the status signal is 'normal', the indicator light is green; when the status signal is short-circuit, the indicator light is yellow, and when the status signal is open-circuit, the indicator light is red. Meanwhile, the status signal can also be represented by corresponding words.
The excitation mode is random excitation, single excitation or periodic excitation. The random excitation indicates that the occurrence of the fault is random and does not need to have a specific condition; the single excitation indicates that a fault can be generated according to set time; the period excitation means that periodic faults can be generated at regular time according to a set period.
The excitation period includes a time period of excitation, a number of excitations, and a time instant of excitation. When the fault is excited in a single excitation mode, the excitation time of the single excitation can be set, and the excitation time can be input to the time of an integer of seconds from 1s to 100 s; when the fault is excited randomly, the random excitation times can be set, and the integer value of 1 to 100 can be input; when the fault is excited in a periodic manner, the number of times of excitation of the periodic excitation and the time period can be set, the number of times of excitation can be input to an integer value of 1 to 100, and the time period can be set to a value of 10s in steps and in a range of 10s to 100 s.
The cable is a coaxial line and/or a shielding line, the shielding line is a twisted pair shielding line or a single twisted pair shielding line, and the mechanical switch or the electronic switch is independently controllable and corresponds to the number of the cables. An electronic switch or a mechanical switch is added on the cable, and the switch can be freely switched among three states of 'normal', 'open' and 'short circuit' through a control signal. The mechanical switch or the electronic switch is in a normal working state by default when being powered on initially.
The duration time of the state signal generated by the mechanical switch is less than or equal to 50ms, and the duration time of the state signal generated by the electronic switch is less than or equal to 100 ns. The mechanical switch adopts a relay, and the electronic switch adopts a microwave switch. By adopting different forms of switches, intermittent faults with different frequencies can be simulated.
As shown in fig. 2, taking the M _ CTRL1 channel, i.e., the 1 st mechanical switch as an example, three states of the 1 st mechanical switch can be realized, and the control signals thereof are M _ CTRL1_ a and M _ CTRL1_ B, respectively. When the M _ CTRL1_ A control signal is set to be at a high level, the K2 relay acts, the 1 st channel mechanical switch is in a short-circuit state, and the indicator light corresponding to the 1 st channel is displayed to be yellow; when the control signal of the M _ CTRL1_ A is set to be low level, the K2 relay is in a normally closed state, the control signal of the M _ CTRL1_ B is set to be high level, the K1 relay acts, the 1 st channel mechanical switch is in an open circuit state, and the indicator light corresponding to the 1 st channel is displayed to be red; when the M _ CTRL1_ A and the M _ CTRL1_ B are both set to be in a low level, the K2 and the K1 relays are both in a normally closed state, the 1 st channel mechanical switch is in a normal state, and the indicator lamp corresponding to the 1 st channel is displayed as green. Wherein, level conversion is carried out through an optical coupling isolation chip VOMA617A-3X001T, and the action time is less than or equal to 10 us; the relay is driven by the ULN2803 Darlington tube, and the action time is less than or equal to 1 us; the G6S-2F-DC12 relay is used for simulating a mechanical switch, and the action time of the relay is less than or equal to 0.5 ms.
As shown in fig. 3 to fig. 5, taking the E _ CTRL1 channel, i.e., the 1 st electronic switch as an example, three states of the 1 st electronic switch can be realized. The control signals are E _ CTRL1_ A1, E _ CTRL1_ B1, E _ CTRL1_ A2, and E _ CTRL1_ B2, respectively. Wherein the E _ CTRL1_ A1, E _ CTRL1_ B1, E _ CTRL1_ A2, E _ CTRL1_ B2 logic level states are shown in FIG. 5. By adding inverters to ensure that the control signal levels of E _ CTRL1_ A1 and E _ CTRL1_ B1 cannot be "1" or "0" at the same time, the control signal levels of E _ CTRL1_ A2 and E _ CTRL1_ B2 cannot be "1" or "0" at the same time. The microwave switch with the model of HMC190BMS8 realizes electronic switch simulation, the action time of the microwave switch is less than or equal to 10ns, and the switch can control the maximum DC 3GHz signal.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A connection type intermittent fault simulation system is characterized by comprising a fault display unit, a signal receiving and transmitting device, a power supply unit, a fault simulation board, a main controller, an operation display unit and an upper computer; the signal transceiver is respectively and electrically connected with the fault display unit and the fault simulation board, the power supply unit is respectively and electrically connected with the fault simulation board and the main controller, the main controller is respectively and electrically connected with the fault simulation board and the operation display unit, and the upper computer is electrically connected with the main controller; the signal receiving and transmitting device transmits a detection signal to the fault simulation board through at least one cable and receives a feedback signal sent by the fault simulation board; the fault display unit is used for displaying the state of the feedback signal received by the signal transceiver; the power supply unit provides corresponding power to trouble analog board and main control unit respectively, main control unit receives the control command that the host computer sent to with control command transmission to trouble analog board, the control command that main control unit sent is received to trouble analog board to through the state of control mechanical switch and/or electronic switch, turn into corresponding state signal with control command, and feed back state signal to main control unit, the operation display element receives the state signal that main control unit sent, and show state signal through pilot lamp and/or characters.
2. A connected intermittent fault simulation system as claimed in claim 1, wherein the upper computer sends control commands to the main controller according to a certain excitation period and excitation mode, and the control commands are transmitted to the fault simulation board through the main controller, so as to generate corresponding signal states.
3. A connected intermittent fault simulation system according to claim 1 or 2, characterized in that the status signal is normal, short-circuited or open-circuited.
4. A connected intermittent fault simulation system according to claim 2 wherein the excitation pattern is random excitation, single excitation or periodic excitation.
5. A connected intermittent fault simulation system according to claim 2, characterized in that the firing period comprises the time period of firing, the number of firings and the moment of firing.
6. A connected intermittent fault simulation system according to claim 1 wherein the cables are coaxial and/or shielded wires and the mechanical or electronic switches are each individually controllable and correspond to the number of cables.
7. A connected intermittent fault simulation system according to claim 1, wherein the mechanical switch generates status signals of duration ≤ 50ms and the electronic switch generates status signals of duration ≤ 100 ns.
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| CN202010106591.6A CN111220938A (en) | 2020-02-21 | 2020-02-21 | Connection type intermittent fault simulation system |
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| CN202010106591.6A CN111220938A (en) | 2020-02-21 | 2020-02-21 | Connection type intermittent fault simulation system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111679127A (en) * | 2020-06-11 | 2020-09-18 | 江苏华创微系统有限公司 | High-speed digital electric connection channel impedance on-line monitoring method |
| CN116298672A (en) * | 2023-01-17 | 2023-06-23 | 国网四川省电力公司电力科学研究院 | Intermittent fault simulation test method based on square wave control |
-
2020
- 2020-02-21 CN CN202010106591.6A patent/CN111220938A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111679127A (en) * | 2020-06-11 | 2020-09-18 | 江苏华创微系统有限公司 | High-speed digital electric connection channel impedance on-line monitoring method |
| CN116298672A (en) * | 2023-01-17 | 2023-06-23 | 国网四川省电力公司电力科学研究院 | Intermittent fault simulation test method based on square wave control |
| CN116298672B (en) * | 2023-01-17 | 2024-01-16 | 国网四川省电力公司电力科学研究院 | Intermittent fault simulation test method based on square wave control |
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Effective date of registration: 20220530 Address after: 264000 No. two, 188 Road, Zhifu District, Shandong, Yantai Applicant after: NAVAL AVIATION UNIVERSITY OF PLA Address before: 264001 No. 188 Erma Road, Zhifu District, Yantai City, Shandong Province Applicant before: NAVAL AVIATION UNIVERSITY OF PLA Applicant before: Yantai Chuxin Aviation Technology Co., Ltd |
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