"逐次近似计算法" can be translated into English as "successive approximation method" or "iterative approximation method".
"Successive approximation method" emphasizes the step-by-step, sequential nature of the approach.
"Iterative approximation method" highlights the iterative (repetitive) process of refining the approximation until a desired level of accuracy is achieved.
Both terms are commonly used in mathematical and computational contexts to describe algorithms that progressively approach a solution through repeated calculations or refinements.