Abstract: Due to the disadvantages of traditional centrifugal pump vibration test, such as more instruments, poor reliability and high test cost etc., this research adopts virtual instrument technology, using LabVIEW graphical and modular programming language to code a program for data acquisition, processing, preservation and fault diagnosis, and meantime utilizing closed-circuit test device, vibration acceleration sensor and data acquisition card as well to build up a system of virtual vibration test system for centrifugal pump. The hardware structure, software frame, design ideas and relevant theoretical basis all associated with the virtual instrument system are elaborated one by one in detail in this project. The vibration test system is oriented to centrifugal pump and can realize claimed functions, such as multi-channel data acquisition, real-time data analysis and data preservation. Vibration acceleration signal of tested centrifugal pump can be collected by thistesting system. The obtained signal can be analyzed by axle center track analysis plus FFT spectrum analysis. Therefore it has realized fault diagnosis of centrifugal pump. Finally, effectiveness of the virtual instrument system in actual vibration monitoring is verified on a centrifugal pump test bench. The system exhibits a good human-machine interface, and is easy to maintain and be expanded.

Key words: virtual instrument, LabVIEW, centrifugal pump, vibration test, fault diagnosis