A Study Of AFDX Digital Simulation Platform Technology

With the development of post-avionics technology, the traditional aviation bus technology can not meet modern avionics and increased range of transmission of information to expand the scale of the data transmission requirements. Efficient, real-time and deterministic data communications has become the direction of modern aviation data bus technology development.ARINC664 specification is the next generation of avionics Committee(AEEC) through the onboard data network standard, Part VII defines a full-duplex Switched Ethernet AFDX protocol with high real-time performance and reliability. Both Boeing and Airbus have already developed matureproducts based on this standard. At present, China has yet to release a mature airborne AFDX network equipment products, Researching and implementing the key technology of AFDX network has great significance to develop our own intellectual property rights owned large aircraft project.AFDX network and digital simulation platform compliant with ARINC664 specification is presented in this thesis which is based on the practice unit research project “AFDX digital platforms”. AFDX digital simulation platform realizes virtual link(VL) bandwidth allocation, traffic management and delay, redundancy management(RM), data integrity checking, CRC check and other key technology to ensure the certainty and reliability of the network.Also it’s able to achieve the overall evaluation of the AFDX network design, with excellent performance.Firstly,AFDX network protocol standards is thoroughly analyzed and interpretation. The thesis studies AFDX network system characteristics and analyzes the virtual link scheduling, redundancy management and integrity testing, and other key technologies. AFDX network Key node devices includes AFDX End systems and Switch, subsystems are other aviation access to the system by the end of the AFDX network.This thesis gives specific functional requirements of AFDX End system and digital Switches.Secondly, the thesis combines protocol standards,designs modules End systems and Switches.Wherein End systems function module is decomposed into drive, transport and communication configuration of three submodules specific design and implementation; Switch module is divided into transmission, reception, filtering policing, scheduling, monitoring of six sub-End system design and implementation.while the Switch port buffers, data buffer and access queues have also been constraints designs.Thirdly, the paper completed a model AFDX digital platforms on the simulation platform OPNET. According to the agreement related to the standard model it gives the network design, data frame structure model; According to the functional module designs of AFDX End system and Switches, thesis gives node model and process model of the digital End systems and Switch, completed AFDX network behavioral modeling.Finally, the thesis completes the AFDX digital platform simulation and validation, including its basic functional verification and performance testing of the system.And it lays the foundation for evaluating system performance. The simulation results show that the design of AFDX digital simulation platform complies with protocol standards and completes the design requirements. At the same time that has good performance.