numerical equation meaning in English

数值方程
数字方程

The finite element method ( fem ) is a kind of numerical calculation method to resolve numerical equation
有限元方法是求解数理方程的一种数值计算方法。
To evaluate accurately the ability of radar in evaporation duct environments , a method is proposed which is combined the electromagnetic waves propagation numerical equation with the theories of radar receiver
该文主要针对如何准确评估蒸发波导环境下雷达的探测能力问题，利用电磁波传播的数值方程并结合雷达接收机理论，构建了雷达探测定量评估的模型和方法。