Study And Development Of Strain Test System Based On Virtual Instrument Technology

Strain test is one of the most widely applied technologies in mechanical engineering. Nowadays, the conventional strain test technology gradually can't keep up with the step of modern test technology's development. Virtual Instrument, whose core is computer, is becoming the main trend of test technology instead of conventional instruments. But the software development of virtual Instrument is rather complicate, it limits the application and development of virtual instrument technology in strain test field.In order to solve the problem mentioned above, a strain test software system was developed in LabVIEW 8.0. First, functional module design method was adopted to construct the software system based on studying the test method using traditional instruments. In the process of realizing functional module,"event-loop-state machine"model was designed. Second, the running procedure of software system was designed based on studying the conventional test process. Third, based on the strain test hardware system consisting of NI SCXI-1520 etc., the modules including parameter initialization, bridge balance, shunt calibration, filter, stress and load display, time domain analysis, frequency domain analysis, data storage, signal replay, experiment report generation and static calibration of system were developed to implement the test and control assignment. Finally, some experiments were done to validate the system's reliability.The user was capable of carrying out the strain test and analysis task using the corresponding software test system constructed only through clicking the functional buttons on the system's main board according to the test requirement. It makes user far away from the complicate software development.