通过PPF投影技术将烟叶配方原料的近红外光谱投影到二维坐标平面上, 将原料烟叶光谱投影点按配方比例加权求和后构造出配方投影点, 建立配方的投影结构模型, 利用蒙特卡洛方法模拟原料烟叶投影点的自身差异变动来分析配方投影点偏离初始状态的程度。 结果表明： 配方主导权重, 即配方样品的最高比例越小, 烟叶原料种类越多, 配方偏离初始状态的程度越小, 即配方的稳定性越好, 以上结论与烟叶配方设计时“多类型, 低比例”的认识原则一致。 本文从理论分析角度给出了在不同原料种类数下进行配方设计时, 所对应的配方样品比例上限值, 该量化上限比例的方法对其他有关配方设计的问题也有指导意义。

The present paper builds a model based on Monte Carlo method in the projection of the blending tobacco.This model is made up of two parts: the projecting points of tobacco materials, whose coordinates are calculated by means of the PPF (projection based on principal component and Fisher criterion) projection method for the tobacco near-infrared spectrum; and the point of tobacco blend, which is produced by linear additive to the projecting point coordinates of tobacco materials.In order to analyze the projection points deviation from initial state levels, Mente Carlo method is introduced to simulate the differences and changes of raw material projection.The results indicate that there are two major factors affecting the relative deviation: the highest proportion of tobacco materials in the blend, which is too high to make the deviation under control; and the quantity of materials, which is so small to control the deviation.The conclusion is close to the principle of actual formulating designing, particularly, the more in the quantity while the lower in proportion of each.Finally the paper figures out the upper limit of the proportions in the different quantity of materials by theory.It also has important reference value for other agricultural products blend.