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Zhuhai Testing Institute successfully developed a large-scale port machine fatigue crack online monitor
[ Instrument Network Instrument Development ] Recently, Zhuhai Testing Institute successfully developed large port machine fatigue cracks based on the original Guangdong Provincial Quality and Technical Supervision Bureau research project "on-line monitoring research and device development of large-scale port machine fatigue crack based on piezoelectric impedance technology". Online monitor.
The coastal climate in Guangdong Province is relatively harsh. Large-scale port machinery is prone to fatigue cracks during long-term service. The initiation and expansion will eventually lead to the failure of the whole machine. How to monitor the whole process online is a difficult problem in the industry. Based on the application scenario of piezoelectric impedance technology in on-line monitoring of fatigue cracks in large port machinery, this project developed a set of instruments and equipment suitable for port machine fatigue crack monitoring, including signal excitation, electrical impedance measurement, data acquisition, data storage, The module of characteristic parameter extraction can improve the sensitivity of fatigue crack monitoring, meet the requirements of finding micro-cracks in the fatigue crack initiation stage, and comprehensively investigate the effects of signal excitation self-pressure, detection frequency band, coupling state, environmental noise and structural stress state on detection sensitivity. .
The port machine fatigue crack monitor with more than 8 channels developed by the project applied the piezoelectric impedance method structural health monitoring technology to the on-line monitoring of fatigue cracks of large port machinery for the first time. It can find initial cracks with a size of 0.5mm and crack The entire expansion process is dynamically monitored. Because of its simple operation, high test accuracy and relatively low cost, it has good practical value and popularized application prospects.
(Original title: Zhuhai Testing Institute successfully developed a large-scale port machine fatigue crack online monitor)