Fault injection system for aviation electromechanical integrated test

Abstract

The invention provides a fault injection system for an aviation electromechanical integrated test, and belongs to the overall technical field of an aviation technology electromechanical system.According to the system, disconnection and switching equipment generates a fault signal of a hard wire, and switching of connection of a fault injection main control computer and an electromechanical integrated system terminal on an electromechanical bus is completed; the fault injection main control computer controls hard wire electric control switching, electromechanical system bus switching, cooperation with an exciter and behavior simulation of a fault terminal; through combination of disconnection and switching equipment and a fault injection main control computer, the problems of low fault injection coverage rate, low efficiency, difficulty in realizing a cross-linking test and the like in a traditional electromechanical comprehensive test are solved by adopting an electric control disconnection and programmable fault injection method and depending on a test master control network; the main control computer supports an operation interface and has the functions of expanding fault injection operation, exporting test results and simulating and analyzing fault injection test data, adaptability improvement can be carried out according to different test requirements, and universality is good.

Description

Technical Field

[0001] The present invention belongs to the general technical field of aviation technology electromechanical systems, and in particular relates to a fault injection system for aviation electromechanical comprehensive testing. Background Art

[0002] Fault injection mainly generates various required fault states during the integrated test of aviation electromechanical systems, including analog signal fault injection, digital signal fault injection, power supply fault injection, and communication fault injection, etc. It supports various fault simulations of aviation electromechanical systems and realizes various fault special situation simulations of electromechanical systems. In traditional electromechanical integrated testing, faults such as power supply and analog signals are mainly realized through disconnect panels, simulating the on, off and short circuit of electrical signals in electromechanical systems; bus and communication faults are mainly realized through simulation functions integrated in software. For some specific hard-wired faults, such as power failures and ground wire open circuits, using disconnect panels for fault injection is an effective method. However, in terms of simulated fault types and test efficiency, the following outstanding problems still exist: 1) Low test repeatability: Since each test requires manual operation of the disconnect switch, and each test step needs to be reset, the test repeatability is low. For situations where multiple repeated tests are required, using disconnect panels for testing will be very time-consuming and inefficient; 2) Manual operation: The disconnect panel requires manual operation, and the tester needs to manually switch the disconnect switch and monitor the test process. Manual operation is not only time-consuming but also prone to errors, which may affect the accuracy of the test results; 3) Automation is not possible: Since the disconnect panel requires manual operation, it cannot be integrated with the automated test system. The automated test system can greatly improve the test efficiency and accuracy, but the disconnect panel cannot achieve this advantage.

[0003] For bus and software faults, the built-in test of communication software has the following defects: 1) Cross-linking of tests of different devices: Since the built-in functions of the software are implemented by each device according to its preset test requirements, the functions and implementation methods of different devices are different, and the failure modes and manifestations of their built-in software may also be different. Accordingly, this method cannot support the unified and coordinated cross-linking test of multiple devices; 2) Limitation of test scope: The built-in functions of device software can usually only simulate and test the functions that have been defined and implemented in the software, and cannot perform comprehensive tests for external or unexpected fault conditions, resulting in low coverage. Therefore, using the built-in functions of software for fault injection testing will have limitations in the test scope; 3) Unable to simulate hardware faults: The built-in functions of software cannot simulate hardware faults, such as memory damage, hard disk failure, etc. These faults have an important impact on the normal operation of the system and software. Therefore, it is not comprehensive enough to use only the built-in functions of software for fault injection testing; 4) Test cost and time: The linkage of different devices is usually achieved with the intervention of multiple people, which requires objective test cost and time. In addition, in order to support fault injection testing, additional code and logic need to be added, which increases the difficulty of development and testing.

[0004] In summary, the fault injection coverage and efficiency in traditional electromechanical integrated testing are low, and fault injection makes it difficult to achieve cross-linking testing. Summary of the invention

[0005] In order to solve the problems of low fault injection coverage, low efficiency, and difficulty in cross-linking testing in traditional electromechanical integrated testing, the present invention provides a fault injection system for aviation electromechanical integrated testing, which can achieve smoothness and timeliness of system fault injection by cooperating with the electromechanical test management system. The technical solution is as follows:

[0006] In a first aspect, a fault injection system for aviation electromechanical integrated testing is provided, comprising: a disconnection and switching device, a fault injection host computer,

[0007] The disconnection and switching equipment is used to generate hard-wired fault signals and complete the connection between the switching fault injection main control computer and the electromechanical integrated system terminal on the electromechanical bus;

[0008] The fault injection master computer is used to control hard-wired electronic control switching, electromechanical system bus switching, cooperation with actuators, and behavioral simulation of fault terminals;

[0009] In order to simulate the impact of terminal failure on bus devices, a fault injection host computer is used to simulate the data processing and bus transmission and reception behavior of the faulty terminal to test whether other bus devices respond as expected.

[0010] The disconnection and switching equipment includes multiple hard-line disconnection modules and bus switching modules.

[0011] The hard-line disconnection module includes a relay submodule and an internal bus coupler. The hard-line disconnection module receives the control signal of the internal bus of the fault injection system, completes the target electronically controlled disconnection fault injection, and realizes manual on / off and short-circuit actions;

[0012] The bus switching module is used to complete the intervention of the fault injection host computer, and through high-speed digital isolation technology, it switches the electromechanical system related buses between the original terminal and the fault injection machine.

[0013] The fault injection host computer is specifically used for:

[0014] Communicate with the exciter in the test system, and send a predetermined fault signal to the electromechanical system terminal (such as RIU, etc.) by controlling the exciter; wherein the fault signal is a voltage and current target communication interface, and the specified modes of the fault signal include full definition, superposition and gain; the full definition mode is that the exciter injects a signal of a waveform specified by the fault injection host computer into the terminal; the superposition mode is that the original output of the exciter is superimposed with noise or drift defined by the fault injection host computer; the gain mode is that the original output of the exciter is subjected to the gain defined by the fault injection host computer;

[0015] Execute the fault injection script and send on / off / short circuit signals through the hard line disconnect panel to control the simulation exciter to send fault signals and complete the time synchronization of fault signal injection;

[0016] Through the bus switching panel, faults (such as missing data bits, wrong data replacement and verification faults, etc.) are injected into the electromechanical system bus, and the time synchronization of signal injection is completed;

[0017] Cooperate with the test master control network to conduct linkage testing according to the agreed data exchange protocol and time synchronization mechanism;

[0018] Provides hardware adaptation and management of the internal bus and the target electromechanical system related bus, and reads the fault injection port interface information of the device under test.

[0019] The hardware of the system includes a bus module, a signal generating device, a power control box, a signal adapter box, a fault injection disconnection analog interface device, a discrete quantity analog quantity switching matrix, and an interface adapter;

[0020] The bus module completes the bus simulation function of the fault injection system;

[0021] The signal generating device completes the output and collection of discrete and analog quantities of the fault injection system;

[0022] The power control box completes the power supply control of the test piece or the system under test. The input end of the power control box is a high-precision 28V DC programmable power supply. The power control box is equipped with a multi-channel power output control single module, which independently realizes the control of any power output and provides power on and off control for the fault injection test piece. The control module uses the 485 bus to communicate with the fault injection main control computer, and receives and executes the computer's instructions;

[0023] The signal adapter box adopts a rack-mounted chassis design to complete signal conversion and distribution, match signal electrical characteristics, and has an anti-misinsertion design to maintain the signal interface status consistent with the test piece; a disconnect block is provided on the panel, and all signals of the fault injection system are disconnected and controlled through the disconnect block. At the same time, the measurement calibration of various types of signals is completed through the disconnect block; the signal adapter box also integrates a relay board that outputs the on-off status signal;

[0024] The fault injection disconnection simulation interface device is used for program-controlled switching of bus signals and non-bus signals, and completes the switching control of data channels between the fault injection system, signal stimulus system and test real parts;

[0025] The discrete-analog switching matrix is ​​used for channel switching control of discrete and analog quantities;

[0026] The interface adapter device adopts a chassis design, and the panel aviation plug is divided into areas, namely the test simulation signal input area and the standard aviation plug interface output area. The interface aviation plug in the test simulation signal input area is connected to the electromechanical subsystem exciter aviation plug. The fault injection disconnection simulation interface device is switched back to the function on the interface adapter device to introduce the subsystem excitation signal into the test piece. At the same time, the switching matrix card outputs the fault injection system excitation signal to the test piece through the aviation plug interface.

[0027] Among them, the fault injection disconnection simulation interface device uses FPGA as the main controller, is connected to the fault management computer through Ethernet, receives the switching instructions of the fault management computer, and completes the injection of fault signals and channel switching.

[0028] Among them, the fault injection disconnection simulation interface equipment is composed of a bus switching device and a discrete analog switching device. The switching device has a built-in switching matrix for switching control of test simulation signals, fault injection signals and test piece real signal to meet the fault injection requirements of the fault injection system under specific test conditions.

[0029] Among them, the signal adapter box converts, matches and connects the signals between the signal generating device and the fault injection disconnection simulation interface equipment; a disconnection terminal is provided on the panel of the signal adapter box, and all input and output signals of the fault injection system enter the test system after disconnection.

[0030] Among them, the bus module is composed of a PCI industrial computer and a bus board.

[0031] The signal generating device is composed of a PXI industrial computer and multiple functional boards.

[0032] Among them, the discrete quantity analog quantity switching matrix includes a relay card.

[0033] The beneficial effects of the present invention are at least:

[0034] The present invention combines disconnection and switching equipment with a fault injection host computer, adopts an electrically controlled disconnection and programmable fault injection (fault script editing) method, and relies on a test master control network to solve the problems of low fault injection coverage, low efficiency, and difficulty in implementing cross-linking tests in traditional electromechanical integrated tests. At the same time, the host computer supports an operation interface, which can expand the functions of fault injection operation, exporting test results, simulating, and analyzing fault injection test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the fault injection system;

[0036] Figure 2 Schematic diagram of the location of fault injection in the electromechanical integrated test system;

[0037] Figure 3 This is a schematic diagram of the composition and principle of fault injection;

[0038] Figure 4 This is a schematic diagram of the bus switching principle;

[0039] Figure 5 Hardware diagram of the fault injection system. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0041] The features and illustrative embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is by no means limited to any specific settings and methods proposed below, but covers any improvements, replacements and modifications of structures, methods, devices without departing from the spirit of the present invention. In the accompanying drawings and the following description, known structures and technologies are not shown to avoid unnecessary ambiguity in the present invention.

[0042] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other, and the embodiments can refer to and quote each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0043] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] See also Figure 1 , Figure 2 and Figure 3 An embodiment of the present invention provides a fault injection system for aviation electromechanical integrated testing, comprising:

[0045] Disconnect and switch equipment, inject faults into the host computer,

[0046] The disconnection and switching equipment is used to generate hard-wired fault signals and complete the connection between the switching fault injection main control computer and the electromechanical integrated system terminal on the electromechanical bus;

[0047] The fault injection master computer is used to control hard-wired electronic control switching, electromechanical system bus switching, collaboration with actuators, and behavioral simulation of fault terminals; the fault injection master computer simulates the data processing and bus transmission and reception behavior of the fault terminal to test whether other bus devices respond as expected.

[0048] The connection and switching equipment includes multiple hard-line disconnect modules and bus switching modules.

[0049] The hard-line disconnection module includes a relay submodule and an internal bus coupler. The hard-line disconnection module receives the control signal of the internal bus of the fault injection system, completes the target electronically controlled disconnection fault injection, and realizes manual on / off and short-circuit actions;

[0050] The bus switching module is used to complete the intervention of the fault injection host computer. Through high-speed digital isolation technology, the bus related to the electromechanical system is switched between the original terminal and the fault injection machine. Figure 4 .

[0051] The fault injection host computer is specifically used for:

[0052] Communicate with the exciter in the test system, and send a predetermined fault signal to the electromechanical system terminal by controlling the exciter; wherein the fault signal is a voltage and current target communication interface, and the specified modes of the fault signal include full definition, superposition and gain; the full definition mode is that the exciter injects a signal of a waveform specified by the fault injection host computer into the terminal; the superposition mode is that the original output of the exciter is superimposed with noise or drift defined by the fault injection host computer; the gain mode is that the original output of the exciter is subjected to the gain defined by the fault injection host computer;

[0053] Execute the fault injection script and send on / off / short circuit signals through the hard line disconnect panel to control the simulation exciter to send fault signals and complete the time synchronization of fault signal injection;

[0054] Inject faults into the electromechanical system bus through the bus switching panel and complete the time synchronization of signal injection;

[0055] Cooperate with the test master control network to conduct linkage testing according to the agreed data exchange protocol and time synchronization mechanism;

[0056] Provides hardware adaptation and management of the internal bus and the target electromechanical system related bus, and reads the fault injection port interface information of the device under test.

[0057] See also Figure 5 , the hardware of the system is divided into a bus module, a signal generating device, a power control box, a signal adapter box, a fault injection disconnection simulation interface device, a discrete quantity analog quantity switching matrix, and an interface adapter;

[0058] The PCI industrial computer and bus board form a bus module to realize the bus simulation function of the fault injection system.

[0059] The fault injection management computer uses an industrial computer with an ECO-1818 mainboard. All boards are PCI bus interfaces. It has a built-in 1394B board with 3 channels and 3 nodes, model ZK1E043FKP; 1 AFDX board with 2 10 / 100M RJ45 interfaces, model PCI-AFDX; 1 ARINC429 board with 16 input channels and 16 output channels, model KMHT429-PCI-16R16T; 1 serial card, each with 16 channels, which can be arbitrarily configured as 422 or 485 mode, model CHRU34307;

[0060] The signal generating device is composed of a PXI industrial computer and multiple functional boards to realize the output and collection of discrete and analog quantities of the fault injection system. The non-bus excitation of the fault injection machine is composed of a PXI system. The chassis uses an 18-slot PXI-62719A, the controller is PXI-63982, and it has 2 built-in frequency boards, each with 8 channels for a total of 16 channels, model CHR42203S-EX; 2 resistor cards, each with 6 resistor simulation signals for a total of 12 channels, model CHRU4A206; 1 RVDT / LVDT simulation card, each with 8 outputs, model CHR47201; 2 resolver simulation cards, each with 4 resolver signals for a total of 8 channels, model CPCI-1 304; 2 discrete output cards, each card has 96 outputs, a total of 192 channels, which can be configured as 28V / open or ground / open outputs, model CHRU44206; 2 discrete acquisition cards, each card has 96 acquisition channels, a total of 192 channels, which can acquire 28V / open and ground / open inputs, model CHRU44205; 2 current output cards, each card has 8 outputs, a total of 16 channels, model CHR42205; 1 voltage output card, each card has 64 outputs, model CHR42201; 1 voltage acquisition card, each card has 64 acquisition channels, model CHR41202; 1 current acquisition card, each card has 16 acquisition channels, model CHR41205.

[0061] The power control box realizes the power supply control of the test piece or the system under test. The input end of the power control box is a high-precision 28V DC programmable power supply. The power control box is designed with a multi-channel power output control single module, which can independently realize the control of any power output and provide flexible power on and off control for the fault injection test piece. The control module uses the 485 bus to communicate with the fault injection management computer to receive and execute the instructions of the management computer.

[0062] The signal adapter box adopts 2 4U rack chassis design, with signal conversion and distribution functions, to achieve the matching of signal electrical characteristics, with anti-misinsertion design, and needs to maintain the signal interface status consistent with the test piece. A disconnect block is designed on the panel, and all signals of the fault injection system are disconnected and controlled by disconnection. At the same time, the disconnect block is used to realize the measurement calibration of various types of signals. The signal adapter box is integrated with a relay board to output the on-off status signal. The signal adapter box needs to realize the collection of on-off signals. The acquisition board cannot directly collect on-off signals. It needs to be converted into ground-open signals and then collected using discrete quantity boards. The on-off state conversion module is integrated in the signal adapter box to realize the on-off-ground-open conversion.

[0063] The fault injection disconnection analog interface device is a key device of the fault injection system. This device mainly realizes the switching of discrete, analog and bus signals. The analog interface device consists of a 4U bus switching device and a 4U discrete analog switching device, and adopts a rack-mounted chassis design. The bus switching is realized by an optical relay matrix, and the control of the switching channel is realized by an embedded FPGA main control circuit. It communicates with the fault injection management computer through a switch. Various types of bus switching matrix cards adopt a modular design. When a fault occurs, it can be quickly replaced by a board of the same model to improve the maintainability of the system.

[0064] The discrete analog switching matrix mainly completes the channel switching control of discrete and analog quantities. This function is realized by the relay card. This type of relay switching card adopts a universal and modular design and can be applied to all analog signal switching. When the system is built, multiple relay boards can be inserted on the control baseboard to realize the switching control of multiple signals. The baseboard uses embedded FPGA as the main controller, and the switching card adopts 3U PXI structure, which is highly versatile and easy to maintain.

[0065] The interface adapter device adopts a 6U rack-mounted chassis design. The panel aviation plug is divided into areas, namely the test simulation signal input area and the standard aviation plug interface output area. The interface aviation plug in the test simulation signal input area is connected to the electromechanical subsystem exciter aviation plug. The fault injection disconnection simulation interface device is switched back to the interface adapter device to introduce the subsystem excitation signal into the test piece. At the same time, the switching matrix card can also output the fault injection system excitation signal to the test piece through the standard aviation plug interface.

[0066] The fault injection machine consists of a power control box, an industrial computer, a display, a signal generating device, a bus module, a signal adapter box, an interface adapter, a power supply and a host computer software; it also includes a fault injection disconnection simulation interface device.

[0067] The PXI fault injection computer uses an 18-slot PXI chassis, and the built-in non-bus cards include: discrete input / output card, analog input / output card, resistor output card, resolver output card, frequency output card and LVDT / RVDT output card. Because fault injection has high requirements on the timeliness of signals, the function card is used to directly generate the required signal to improve the response time of the fault injection system excitation. The function card and the PXI computer jointly realize the function of the signal generation device.

[0068] The PCI industrial computer has multiple built-in bus boards, which can simultaneously complete the fault injection management computer function. The bus boards include: 1394B board, AFDX board, ARINC429 board and RS422 / 485 board. The fault management computer is interconnected with the PXI host through a switch and synchronized with other systems to achieve bus communication with the electromechanical semi-physical simulation system and the DSI system.

[0069] The signal adapter box realizes the conversion, matching and connection of signals between the signal generating device and the fault injection disconnection simulation interface device. A disconnection terminal is designed on the panel of the signal adapter box. All input and output signals of the fault injection system enter the test system after disconnection. The fault injection signal should be a standard signal. According to the measurement requirements, the output signal needs to be calibrated. The measurement verification of the analog signal of the fault injection system can be completed through the disconnection terminal. The signal adapter box is equipped with a relay board to provide the system with discrete on-off state control output; the signal adapter box is also designed to collect the hard-wired on-off state of the fault injection disconnection simulation device input to complete the collection and conversion of the on-off state.

[0070] The fault injection disconnection simulation interface device realizes the program-controlled switching of bus signals and non-bus signals, and completes the switching control of data channels between the fault injection system, signal excitation system and test piece. The switching device uses FPGA as the main controller, connects to the fault management computer through Ethernet, receives the switching instructions of the fault management computer, and completes the injection of fault signals and channel switching. The fault injection disconnection simulation interface device consists of a bus switching device and a discrete analog switching device. The switching device has a built-in switching matrix that can realize the switching control of test simulation signals, fault injection signals and test piece signals, meeting the fault injection requirements of the fault injection system under specific test conditions. The switching matrix board has a switching status reading function, which can realize the switching status readback of the switching matrix, report the switching matrix control status at any time, upload it to the fault management computer through Ethernet and display it in real time on the software interface.

[0071] The interface adapter completes the access of the test simulation bus signal and non-bus signal through the standard aviation plug. The adapter converts the input hard wire and then outputs it. The output interface uses a high-density connector. The output signal enters the bus switching matrix and discrete analog switching matrix of the fault injection disconnection simulation interface device according to the signal type, and is output after passing through the matrix. The output signal is connected to the bus aviation plug interface and discrete analog aviation plug interface of the interface adapter device, and finally connected to the real test piece through the standard aviation plug interface through a special adapter cable.

[0072] In summary, the present invention combines the disconnection and switching equipment with the fault injection main control computer, adopts the electronically controlled disconnection and programmable fault injection method, and relies on the test master control network to solve the problems of low fault injection coverage, low efficiency, and difficulty in achieving cross-linking testing in traditional electromechanical integrated testing; at the same time, the main control computer supports the operation interface, and can expand the functions of fault injection operation, exporting test results, simulation, and analysis of fault injection test data. The design method is easy to transplant, can be adaptively improved according to different test requirements, and has good versatility.

[0073] The above only expresses the implementation mode of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. In addition, the parts not detailed in the present invention are all conventional technologies.

Claims

1. A fault injection system for aviation electromechanical integrated testing, characterized in that: include: Disconnect and switch equipment, inject faults into the host computer, The disconnection and switching equipment is used to generate hard-wired fault signals and complete the connection between the switching fault injection main control computer and the electromechanical integrated system terminal on the electromechanical bus; The fault injection master computer is used to control hard-wired electronic control switching, electromechanical system bus switching, collaboration with actuators, and behavioral simulation of fault terminals; the fault injection master computer simulates the data processing and bus transmission and reception behavior of the fault terminal to test whether other bus devices respond as expected.

2. The system according to claim 1, characterized in that The disconnection and switching equipment includes multiple hard-line disconnection modules and bus switching modules. The hard-line disconnection module includes a relay submodule and an internal bus coupler. The hard-line disconnection module receives the control signal of the internal bus of the fault injection system, completes the target electronically controlled disconnection fault injection, and realizes manual on / off and short-circuit actions; The bus switching module is used to complete the intervention of the fault injection host computer, and through high-speed digital isolation technology, it switches the electromechanical system related bus between the original terminal and the fault injection machine.

3. The system according to claim 1, characterized in that The fault injection host computer is specifically used for: Communicate with the exciter in the test system, and send a predetermined fault signal to the electromechanical system terminal by controlling the exciter; wherein the fault signal is a voltage and current target communication interface, and the specified modes of the fault signal include full definition, superposition and gain; the full definition mode is that the exciter injects a signal of a waveform specified by the fault injection host computer into the terminal; the superposition mode is that the original output of the exciter is superimposed with noise or drift defined by the fault injection host computer; the gain mode is that the original output of the exciter is subjected to the gain defined by the fault injection host computer; Execute the fault injection script and send on / off / short circuit signals through the hard line disconnect panel to control the simulation exciter to send fault signals and complete the time synchronization of fault signal injection; Inject faults into the electromechanical system bus through the bus switching panel and complete the time synchronization of signal injection; Cooperate with the test master control network to conduct linkage testing according to the agreed data exchange protocol and time synchronization mechanism; Provides hardware adaptation and management of the internal bus and the target electromechanical system related bus, and reads the fault injection port interface information of the device under test.

4. The system according to claim 1, characterized in that The hardware of the system is divided into a bus module, a signal generating device, a power control box, a signal adapter box, a fault injection disconnection analog interface device, a discrete quantity analog quantity switching matrix, and an interface adapter; The bus module completes the bus simulation function of the fault injection system; The signal generating device completes the output and collection of discrete and analog quantities of the fault injection system; The power control box completes the power supply control of the test piece or the system under test. The input end of the power control box is a high-precision 28V DC programmable power supply. The power control box is equipped with a multi-channel power output control single module, which independently realizes the control of any power output and provides power on and off control for the fault injection test piece. The control module uses the 485 bus to communicate with the fault injection main control computer, and receives and executes the computer's instructions; The signal adapter box adopts a rack-mounted chassis design to complete signal conversion and distribution, match signal electrical characteristics, and has an anti-misinsertion design to maintain the signal interface status consistent with the test piece; a disconnect block is provided on its panel, and all signals of the fault injection system are disconnected and controlled through the disconnect block. At the same time, the measurement calibration of various types of signals is completed through the disconnect block; the signal adapter box also integrates a relay board that outputs on-off status signals; The fault injection disconnection simulation interface device is used for program-controlled switching of bus signals and non-bus signals, and completes the switching control of data channels between the fault injection system, signal stimulus system and test real parts; The discrete-analog switching matrix is ​​used for channel switching control of discrete and analog quantities; The interface adapter device adopts a chassis design, and the panel aviation plug is divided into areas, namely the test simulation signal input area and the standard aviation plug interface output area. The interface aviation plug in the test simulation signal input area is connected to the electromechanical subsystem exciter aviation plug. The fault injection disconnection simulation interface device is switched back to the function on the interface adapter device to introduce the subsystem excitation signal into the test piece. At the same time, the switching matrix card outputs the fault injection system excitation signal to the test piece through the aviation plug interface.

5. The system according to claim 4, characterized in that The fault injection disconnection simulation interface device uses FPGA as the main controller, is connected to the fault management computer through Ethernet, receives the switching instructions of the fault management computer, and completes the injection of fault signals and channel switching.

6. The system according to claim 5, characterized in that The fault injection disconnection simulation interface device consists of a bus switching device and a discrete analog switching device. The switching device has a built-in switching matrix for switching control of test simulation signals, fault injection signals and test piece real signal.

7. The system according to claim 5, characterized in that The signal adapter box converts, matches and connects the signals between the signal generating device and the fault injection disconnection simulation interface device; a disconnection terminal is provided on the panel of the signal adapter box, and all input and output signals of the fault injection system enter the test system after being disconnected.

8. The system according to claim 4, characterized in that The bus module consists of a PCI industrial computer and a bus card.

9. The system according to claim 4, characterized in that The signal generating device is composed of a PXI industrial computer and multiple functional boards.

10. The system according to claim 4, characterized in that The discrete analog switching matrix includes relay cards.

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