To predict the conditions of large rotating machinery, a gray prediction model was
proposed, and an open and flexible prediction system based on virtual instrument (VI) was
developed for easy adaptation to new users and application. This system was developed by using
LabVIEW and VC++,and has been applied in industry. The results of practical verification on
large pumps indicate that the technology presented is capable of predicting the date of a fault and
reducing the times and cost of maintenance.