Research Of Testing System Of The Alternating Transmission Diesel Locomotive Output Tet-Bed Based On VXI Bus

Technology of alternating transmission has became the milestone of new technology in the tractive power field around the world. With the development of the railway industry in our country, alternating transmission diesel locomotive leads the direction of the development of locomotive. In accordance with the Regulations of Ministry of Railway, locomotive must pass relevant test and debug before output. Therefore the establishment of the out-of-factory test-bed is an indispensable and crucial part in the production of alternating transmission diesel locomotive.With the development of computer technology and testing instrument technology, the data acquisition system based on a variety of data bus has also developed fleetly. Compared with other data acquisition system based on ISA, PCI, PXI bus, more advantages are provided when the system is based on VXI bus, which makes it become the chief choice in data acquisition system.With the application of modem testing technology, the paper researches and develops a testing system based on VXI bus, which is one of the main invested 95 projects in Ministry of Railway and used for the output of the alternating transmission diesel locomotive. The paper mainly discusses the development of the testing system, used for the output of alternating transmission diesel locomotive of SiFang locomotive Factory, heavily involved in demonstration of testing system project, select and configuration of transducer and hardware, development of software and the measurement of anti-interference. Demonstration of testing system is considered from system integration. The effects of factors of all aspects are considered at first. The project chosen has achieved the demand of system integration. The physical parameters are chiefly considered in the choice of sensors, which should measure the signals exactly. Compared with many data acquisition system, the type and configuration of the hardware is considered and the one based on VXI bus is chosen at last, which can fulfills the performance of high-speed, large capability, real-time acquisition and high dependability etc. The language of UML is adopted in the development ofsoftware, as well as visible programming language------DelphiS.O, the visualprogramming language. A powerful software is designed, including flexible configuration, data acquisition, management of database, data processing, auto-produced report forms. The preventative measurement of anti-interference is chiefly considered from connection of power ground andsignal ground to cable transmission.According to the requirements of SiFang locomotive Factory, after the hardware and software debugging in the laboratory, the testing system is qualified to meet all requirements and performs successfully as expected.