It is concluded that the Gaussian curvature method can reflect the shapevariation of coal seam curvature, and the method is effective to forecast natural fracture zones in coal seam.
分析表明，高斯曲率法可相对真实地反映煤层曲面形态变化，用该方法预测煤层天然裂隙发育区是切实可行的。
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Experimental results show that the proposed OSS can offer the maximum shapevariation with reserving the principal information and a unique local optimal shape is acquired after optimal searching.
Accordingly it is very important to control and forecast the dimension change and the geometric shapevariation of the final product in the powder metallurgy process, especially the design of mould.