Determination Method of Nonlinear Membership Function Based on the Density Function of the Square Error

In this study, membership function is used to express the uncertainty in the petroleum drilling, then the fuzzy density clustering method based on density function of square error is put forward, which has avoided the defect of artificial clustering parameter and initial centroid, by using this fast algorithm, the clustering center, the number of clustering center and the parameters used for describing the nonlinear membership function can be obtained. In the simulation, the nonlinear membership function of change percentage of flow out rate EB_Da36 is determined, which has solved the problem that the membership function is hard to be defined.