The Failure Mode And Maintenance Strategy Research Based On The Maintenance Data Of Gearbox

At first, this article processed the Shao Shan 3B gearbox maintenance data, achieved some numbers of time between failure of the A running gear、the D6 right position of the gearbox.Using the some working hours before the first failure of locomotive gearbox fitted the common three typical distributions of reliability theory-lognormal, Weibull distribution and Gamma distribution, found that the fitting effect is very good, and estimate the three typical distribution coefficient.Then, still take advantage of the some sets of data to calculate the some time points gearbox failure frequency, this failure and the failure rate function of frequency distributions of the three typical fitting, found fitting effect is very bad. Thus, the failure rate function compared with the distribution function in depicting component failure rule more sensitive and more intuitive. After observing the multiple locomotive maintenance data, found that the gear box always failure and repair many times appeared in a short period of time. This paper proposes two types failure mode of gear box, and corresponding distribution parameters have been obtained respectively from failure rate.Finally, consider the two types failure mode of gearbox, the maintenance strategies are put forward. Assumption of preventive maintenance for gear box is imperfect maintenance, before each preventive maintenance cycle time there are the detection of periodic maintenance. The objective function is minimum maintenance fee, consider the reliability function of two types of failure mode as constraint conditions, and established a combination of preventive maintenance, periodic inspection maintenance and replacement maintenance optimization model. Then this article have the best preventive maintenance cycle of gearbox, the best number of inspection maintenance and the best time to replace. In the actual locomotive repair work, it provides references to improve the maintenance efficiency of gear box, reduce the maintenance cost.