2004 Volume 66 Issue 5 Pages 41-48
This paper describes the use reliability of Chinese tractors, as assessed by measuring working hours until failure occurred in an agricultural field. A failure intensity function and reliability function for working hours before the first failure were evaluated using a nonhomogeneous Poisson process. Parameters in the Weibull process and Weibull distribution estimated using a neural network are almost the same as the results obtained with the probability paper and other statistical methods. As the shape parameter (β) in the failure intensity function is β<1, the behavior of the mean time between failures is a monotonous increase. Working hours before the first failure follow a Weibull distribution, and the shape parameter β is 1.24>1.