Project Description:
Basic functionThe bus simulation and test system can receive, monitor, record in real time, and play back data on all ARINC429, MIL-STD-1553, AFDX bus signals, discrete signals, and analog signals of the computer channel, through intuitive data monitoring, and various signals. With the parsing function from the original code to the physical meaning, system test, operation record, fault location and status monitoring can be performed quickly and effectively.
The block diagram is as follows:
The integrated avionics simulation and test system simulates and tests the ARINC429, 1533B, and AFDX bus signals including: data transmission, protocol verification, electrical performance, noise suppression, error injection, transmission status, testing, analysis, and troubleshooting. , And provide a good graphical interface to complete the above simulation and test functions.
The provided analog output channels have a voltage range of ±10V per channel, and can realize analog signal signal testing, signal display, signal recording, signal analysis, recording (automatic report generation), and signal playback. Two types of analog signal injection methods are provided: automatic injection (test device injection) and manual injection (1 to 2 external standard source injections). Selection of the injection mode is selected by the front panel breakout block, and a signal light indication is provided.
Provides channels for discrete outputs as well as channels for discrete inputs. Among them, the discrete output channel is controlled by the front panel switch, and the discrete input channel is realized by the broken connecting block and the signal lamp. And provide discrete records, display, automatic reporting and other functions.
Provides detection of the secondary power supply (-5VDC, ±15VDC) inside the computer under test, real-time display, recording and other functions.
2. System solutionMost of the system's simulation testing process can be divided into mathematical model simulation testing phase, semi-physical simulation testing phase of a single device, semi-physical co-simulation testing phase of multiple devices, and physical simulation testing phase. At present, most of the simulation test equipment on the market can only meet the requirements for simulation testing in a single stage. The inheritance and scalability of the hardware system are poor, causing a lot of hardware duplication. And the simulation test equipment in different stages has a great difference in the software usage habits, which brings a lot of unnecessary labor to the system simulation designers and testers.
Therefore, we hope to provide a simulation and detection system solution with good versatility and high scalability. This solution can meet the needs of customers for simulation and testing in different development stages, reduce the familiar time for software use, and improve work efficiency. Save on hardware costs.
2.1 Mathematical model simulation stage
System composition:
Hardware: PC + Reflective Memory Network
Software: Windows/RTX + Matlab/Simulink + Labview
The avionics bus simulation system hardware platform is divided into two parts: host system (main control computer) and target system (cockpit display control system, high lift control system, flight control computer, radar, etc.). The host system and the target system are connected through the reflective memory network and Ethernet. The reflective memory network is used to transmit simulation parameters and simulation results in real time; Ethernet is used to transfer other file information and interactive content.
2.2 Half-material phase: single device
System composition:
Hardware: PC + Reflective Memory + Bus Simulation and Test Equipment
Software: Windows/RTX + Matlab/Simulink + Labview + Vxworks
In the semi-physical phase, simulation systems at this stage can be built using reflective memory networks and avionics simulation and testing equipment. The host computer completes the establishment and modification of the simulation model, and the avionics bus simulation and testing equipment completes the simulation model operation and controls the ICD and DDR file exchanges with the data of the avionics bus. The avionics equipment dynamic simulation is realized on the avionics bus simulation and testing equipment to meet the requirements of the aircraft avionics system ground dynamic simulation test.
2.3 Half-material phase: multiple devices
System composition:
Hardware: PC + Reflective Memory + Multiple Bus Emulation and Detection Devices
Software: Windows/RTX + Matlab/Simulink + Labview + Vxworks
The host system uses MATLAB and Simulink to create system models, analyze models, and conduct preliminary tests. The models are converted to C code and compiled through customized templates and scripts, automatic code generation tools, and executable files are distributed to the target system through the real-time network of reflective memory. Run on real time. At the same time, through the I/O module library under Simulink, modules in each target system are connected to external systems through I/O boards. The reflective memory network can realize the real-time transmission of data between target systems. Therefore, the target can realize real-time operation of the model, on-line parameter setting, data acquisition, and event monitoring. The characteristic of the whole system is that the designer can work completely at the Simulink level, and the model can be run in the hardware loop in real time without writing code.
To sum up, the integrated avionics bus simulation and testing system is mainly used in the phase of hardware-in-the-loop simulation testing. It can not only meet the functional requirements of real-time simulation and detection, but also has the advantages of flexible application and easy expansion.
3. Program evaluationThe above solution not only satisfies the customer's needs for avionics bus, analog digital signal, and power supply detection, but also facilitates the expansion, builds a simulation system, and completes the PFC cross-linked avionics environment, high lift control system, automatic flight control system, and other models. Simulation meets the user's need for simulation testing at different stages of development.
3.1 Intelligent
The bus function module uses the GE avionics card, which has been widely confirmed, and can perform bus simulation and test tasks reliably and efficiently. At the same time, the software provides one-button operation, which can intelligently complete the testing and recording of various aspects of the ARINC429, 1553B, AFDX bus, analyze the automatic test data, monitor the status of the system under test, and have an error warning function; Fault location can occur when it occurs.
3.2 Modularization
The bus function module is separated from the analog and digital signal simulation detection modules and controlled by two main control boards, which helps to reduce the load of each main control board and improves the stability of the main control board during operation. The modularization of the software design allows for easy modification or addition of system functions to facilitate customer demand changes and feature upgrades. The open data monitoring API can facilitate users to expand the number of monitoring terminals. The target machine simulation interface library allows the user to perform secondary development and customize the main control program that is completely suitable for him.
3.3 Networking
The system provides remote control interfaces via Ethernet. The Webserver is built in VxWorks. It can access the test system through the Ethernet page, and can send, start, pause or stop the control commands. It can also expand the monitoring terminal through Ethernet or real-time network to solve the geographical restrictions. At the same time, users can easily download and manage simulation and test data.
3.4 Real-time performance
The VMIC5565 series of reflective memory cards has a transmission speed of 174 Mbytes/sec. With fiber optics, more nodes (up to 256 nodes) can be connected and have high anti-interference capabilities. Test results show that from the data written to the RAM to the reflective memory card sent to another node, there is only a delay of less than 400 nanoseconds, which ensures the real-time performance of the system. Simultaneous use of reflective memory network users can easily set up different stages of the simulation test platform, easy to expand.
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