An algorithm to realize the cosine wave-crossing method in digital cycloconverter is performed by using the linear equation to approximate trigonometricequation.
在数字式交鄄交变频器中，一般采用直线方程近似三角方程的方法实现余弦交点法求触发角。
2
A precise pass-size and welded pipe with excellent surface quality can be get when the deformation way of cube-pass and design calculation with surpass trigonometricequation are used.