Triangle and monotone membership functions have simple forms and clear physical meaning, which are commonly used in the research work. In this paper, a density clustering method based on the interval is brought forward, which has avoided the cluster results falling into a local minimum, also by using this method, the cluster center can be quickly obtained. Through simulation, the piecewise linear membership function of variation of total volume in petroleum drilling is determined, which solves the problem that the function is hard to be defined.
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