Development Of A Multi-channel Signal Simulator Of An Aircraft Based On PXI Bus

The launch control test system,target calibration test system,integrated test system,angular velocity sensor and amplifier test system matched with a certain type of aircraft can complete the complex test tasks of the key components of the type of aircraft,and it is the key equipment for judging whether the aircraft is qualified or not..However,due to the sophisticated and complex system structure of the aircraft itself,frequent power-on tests and cooling air supply will affect its service life.Therefore,the actual situation does not allow the test equipment to occupy the aircraft and its related auxiliary test equipment for a long time during the research period;The aircraft cannot provide failure test data,and therefore cannot conduct a comprehensive and effective evaluation of the test system.Based on the above problems,this paper proposes a PXI bus-based multi-channel signal simulator development method for a certain aircraft.The simulator can effectively replace the aircraft and related auxiliary equipment,support the development and debugging of the test system,improve the efficiency of research and development,and reduce the cost of development.Through detailed analysis of the hardware structure,test interface and signal types of the above four test systems,the basic functions of the signal simulator system are summarized and the key technical indicators for design and development are put forward.On this basis,the overall system framework of a PXI chassis with an industrial computer as the control core and an external integrated remote controller was determined.In terms of system hardware design,a careful study and comparison of several instrument bus standards that are currently widely used in the field of automatic test equipment were carried out.Finally,the system hardware architecture based on the PXI bus standard was selected,and according to the functional requirements and design indicators of the simulator,The PXI function modules and other related hardware devices that meet the requirements are selected.In terms of system software design,Winform based on C# was selected as the user layer framework of the simulator system software,and software development was completed under the Visual Studio 2017 development platform.Based on the software modular design concept,combined with multithreading and database technology,while giving full play to the advantages of object-oriented programming languages,the system login management module,self-check module,configuration management module,communication module,signal analog output module and task execution control are completed The software design of the module.Finally,detailed debugging and verification schemes were designed for the hardware and software parts of the signal simulator system,and joint debugging was carried out with each test system.The results show that the signal simulator system is stable and reliable,the hardware design of the system meets the standards,and the various functions of the software meet the debugging needs,which can effectively assist the development of the test system.