According to the results of numerical calculation, the proximate formula of estimating radius of the beam was developed.
根据数值计算结果，提出一个计算束半径的近似公式。
The theoretical and numerical simulation hysteresis loops are proximate, it shows that the theoretical calculation model is feasible.
理论计算与数值模拟得到的迟滞回线基本一致，说明本文采用的理论计算模型是可行的。
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