摘要
针对原始序列为近似非齐次指数规律,利用直接建模思想,得到NGM(1,1,K)模型的直接形式;以模型的白化方程为基础,运用梯形公式优化灰导数,改进了时间响应函数,从而对NGM(1,1,K)直接模型进行了改进.应用实例表明:该改进模型可以有效提高模型精度,也拓宽了灰色预测模型的使用范围.
In order to solve the non-homogeneous dispersion index function, a NGM(1,1,K) direct model was proposed by using the method of the direct modeling. Based on the white different equation and trapezoid formula, grey derivative is whiten, and then the time response sequence is improved. A new grey prediction model was proposed in the paper. The comparative analysis show that the amendatory model is better in accuracy and the application of grey prediction model can also be extended.
出处
《辽宁工程技术大学学报(自然科学版)》
CAS
北大核心
2014年第4期556-559,共4页
Journal of Liaoning Technical University (Natural Science)
基金
河南省自然科学基金资助项目(0511013800)
河南省教育厅自然科学基金资助项目(12A110001)
关键词
灰色系统
直接NGM(1
1
K)模型
近似非齐次指数
白化方程
梯形公式
灰导数
时间响应函数
grey system
NGM(1,1,K) direct model
non-homogeneous dispersion index function
white differentequation
trapezoid formula
grey derivative
the time response sequence