Detection Of Engine Vibration Based On Virtual Instrument

The engine is the power source for vehicles, its overall performance is good or bad will directly affect the overall performance of vehicles. Engine vibration engine performance evaluation information is an important indicator, manufacture, use and maintenance departments need a great deal of engine performance test. Therefore, the use of the virtual technology on engine performance test, a practical significance.Discourse use the engine vibration experiments involving data to DASYLab virtual technology as a platform to study full-featured, easy test for automotive information acquisition and processing system, detailed graphic language and the various high-level language advantages, respectively design information acquisition and processing subsystem and the subsystem to achieve data connectivity; E-R model through the establishment of the logical structure of the database discussion, the data model of conversion, completed the physical design of the database system and the subsystem, subsystems and the database data interface design. Finally, the factors affecting the reliability of the system for analysis, and put forward a specific solution, so as to effectively ensure the test vehicle information acquisition and processing system reliability.The work of the mainly dissertation reflects in the following aspects:The use of graphical programming language, graphic language and a high-level language of different strengths, intuitive, convenient and accurate data to establish the channel, respectively design information acquisition and processing subsystems, and systems to achieve DASYLab data collection, processing, reading, storage integration. Through subsystem of data between the intake and achieve data connections between subsystems.Freedom Ship road test, through the design of the system for testing and building a support system running Access database, and the test involves large amount of data classification, in accordance with the needs analysis, conceptual design, logic design structure, Physical database design and structure of the implementation of the five steps, from the completion of the ER model to the relational model, and then to design the structure of the database table, and ultimately establish a support vehicle test information collection and processing system running database. In the database and systems connectivity, ODBC is designed as an open-source data DASYLab and Access between the two data communications interface, has two mutual transmissions of data.In the course of automotive test, test equipment, instrumentation, and test measured targets themselves are in varying degrees by the influence of various factors, the reliability of test data will directly determine the outcome of the evaluation of the performance of the car credibility. Papers on the factors affecting the reliability of the system were analyzed, with specific solutions, from hardware, software, personnel, and four environmental taken measures to improve the reliability of the system.The experimental results show that, compared with the virtual technology, the traditional instruments of powerful, but manufacturers limited functionality, complex testing, a wide range of equipment for complicated to operate, and the operation of the technical staff require a higher level; apparatus Built-in functions from the circuit or mechanical structure decision can not control mode with the requirements of different users and habits changed; equipment needed for the development of various technologies and cost components, resulting in high costs and extremely, difficult to update the equipment size larger, not all at the test site, complete real-time data collection, processing and analysis of the process, unable to adapt to the information society for high-efficiency requirements. The results indicate that the DASYLab established Detection System, a comprehensive system, stable performance, high precision, easy to operate, fully embodies the advantages of virtual technology equipment.