Realization of rapid plotting raw coal washability curve using cardinal spline curve algorithm

In order to increase the raw coal washability curve plotting speed and the accuracy of the data acquired,a rapid raw coal washability curve plotting method is proposed. The essence of the method is to realize visualization of the washability curve and automatic data reading based on the trend of variation of given density points and through first Akima spline automatic interpolation and then programming with the use of the C# cardinal spline curve algorithm. Extensive cases of field application indicate the method is high in efficiency and can produce a good curve-fitting result. Moreover,its automatic value reading possibility makes it possible to provide accurate data for subsequent analysis.