When the material is prepared, each pipe is required to draw its developed map by using mathematics analysis, that is, common coordinate method and triangular method.
蜗壳的每一节，在下料时需要绘制展开图，采用数解法进行展开，即常用的坐标法或三角形法。
2
The area coordinate method has been successfully applied to construct triangular elements.
构造四边形单元时，应用面积坐标方法有其优点。
3
The singular integral problems emerged in calculations were solved through triangular polar coordinate transformation;