The Research Of Mechanical Engineering Testing Technology Experimental Teaching System

The 21st century is an era of information. Testing and control technology, communication technology and computer technology constitute the three pillars of the information industry together. In recent years, since the testing technology has a rapid development and wide application in machinery industry, engineering testing technology as a course was added in many colleges.The course introduces the testing methods and signal analysis methods of common physical principles in mechanical engineering, industrial automation or other engineering fields, such as pressure, strain, temperature, noise and other principles. The course is not only strong theoretical, complicated formula, but mode of thinking will be changed from the time domain to the frequency domain, and the process of specific application is abstract. Only through a lot of intuitive experimental operation can achieve the best learning results. This makes design and developed mechanical engineering testing laboratory become an urgent problem. In response to this feature, we developed a mechanical testing system which based on LabVIEW platform. We use progressive teaching methods instant traditional teaching methods. The content of experiment is divided into three parts; there are basic experiment, comprehensive experiment and exploratory experiment. Helping students deepen their understanding of the book, and improve skills and practical ability in the course of the experiment. This paper describes several parts from the following:First, compared virtual instrument with traditional mechanical test system on the performance, price, operational and other aspects, and then analyzes the content of curriculum, planning the content of experimental systems.Second, Simulation Laboratory: determine the contents of the virtual laboratory experiments which related to the signal processing knowledge in books. And program for each knowledge point to achieve its function. Finally, publishing the program through web. Comprehensive Experiment: determine the amount of experimental content which are commonly used for mechanical testing machine. The hardware side, select the appropriate sensors, the acquisition card. The software side, select the LabVIEW software, program data collection and data preparation procedures. Exploratory experiments: Build the experimental platform. Use the existing test bed (including the motor and the rotor etc), sensors, signal conditioning modules and data acquisition card and so on, to simulate various states of rotating machinery. Built a completely fault diagnosis experimental system of rotating machinery. Through the experimental system, many data form the running rotor, can be collected, analyzed and displayed.The experimental system based on LabVIEW is combined with mechanical testing techniques teaching courses closely. The signal Simulation Laboratory is the basis experiments based on book, involving the time-frequency domain analysis, filter design, sampling and other experiments, close to the books and helping students understanding and digest the majority of basic theoretical knowledge of signal processing and digestion. Meanwhile, comprehensive experiments and exploratory experiments are combined with engineering applications. In teaching practice, the system can play a good role in supporting education. More conducive to students to master the sensors, signal processing knowledge and test knowledge of the system, and help students'practice and innovation ability.