Study And Development Of Strain Measurement Based On Virtual Instrument Technology

Strain measurement is one of the important means that analyses accessory or structure stress, validates design correctness, confirms complete machine load status when working or studies physical phenomenon mechanism in mechanical engineering. So with quick speed developing high-powered strain measuring instruments is needed. The paper firstly introduces the strain measurement present status and developing trend at home and abroad, analyses traditional hardware-based instrument for strain measurement key feature and existing shortages. Subsequently introduce the theory, method of strain measurement and correlative signal processing knowledge. At the same time introduces conception, characteristic of virtual instrument technology and development technique of virtual instrument. The virtual instrument and hardware-based instrument are contrasted, which stands out the superiority of virtual instrument. The virtual instrument is a sign that measurement system is transforming from hardware-based system to software-based system. It has broken through traditional concept of instrument. Then bring forward changing tradition hardware-based instrument for virtual instrument technology, develop the strain measurement instrument based on virtual instrument technology.In this paper, it expatiate logic structure and software and hardware design of virtual strain measurement system. At Visual C++ development platform using OOP software design method develop the virtual strain measurement instrument that its figure is true to nature, its function is powerful. The software of system is composed of center control module, initialization module, data processing module, data processing module, graphical display module, data storage module and the auxiliary functions module. It fulfils signal acquisition, processing, analysis and display. The system can realize real-time measurement for many parameters that correlate with strain. It can realize integration for sampling and processing of signal, visualization for data and result. The system is lower cost and higher work efficiency. At the same time with instrument do experiment on site testing, do error analysis to test result, bring forward resolve method and measure. It stand out that software is a pith of virtual instrument. The applied cost of virtual strain measurement system based on component technology is stressed. Lastly bring forward the further development of system, that is distributing network measurement. Introduced virtual strain measurement instrument in the paper is a successful try that Prof. Shuren Qin take the initiative apply virtual instrument technology to measurement system. Engineering practice make show that virtual strain measurement instrument have the features that its function is powerful, its precision is high, its efficiency is high, its cost is low and its openness and expansibility is good. It can replace traditional hardware-based instrument for strain measurement completely, is a measurement instrument that can be extended abroad.