Research Of Measuring Method On The TraceWater In Lubricating Oil

Lubricating oil contamination is one of the main reasons of failures and life reduction of mechanic equipment. It can also cause a lot of problems such as additive wasting, oil oxidation, corrosion, lubricant film thickness reduction and animalcule growth. The traditional way of testing has the disadvantages of check period long, cost high, check method bother, the data acquisition and processing depending on person too much. So we should find a way to test the lubricating oil on-line.In this paper, under relative oil contamination control theories and on-line testing methods being lucubrated and analyzed, we develop a suit of oil contamination on-line testing system based on LabWindows/CVI with the owned designed microwave resonance sensor, NI's DAQ card PCI-6014E, HP-PC and other accessories.The whole design project was confirmed, and the basic theory of oil trace water monitoring was investigated. On basis of hardware module design, VI technology and relative function and relative criterion being lucubrated, LabWindows/CVI operation software was designed by using of object-oriented technology. The data acquisition and processing technology being deeply investigated and adequately considering its anti-jamming design, arithmetic language was designed to realize digital filtering and mean processing, the data acquisition and processing of the signal. On basis of oil contamination characteristic parameter and its international standards, demarcate experiments using criterion contamination oil were made, and contamination math model function of the system was confirmed, so the on-line test of the trace water in oil was gone on to validate math model function. The exceed-limit alarm was designed and the trace water percentage grade report was presented. The system has the capabilities of adaptability, agility and expansion.