The general equations of principal curvature derived from differential geometry overcame the limitations of previous equations derived from the theory of elastic thin plate with small deflection.
由微分几何学原理得到计算主曲率的一般公式，克服了由薄板小扰度弯曲理论得到的主曲率计算公式的局限性。
Based on the elastic small deflection theory for the thin shell, the basic differential equations of the mixed method are established.
文中推导建立了一般情况下带肋扁壳混合法的基本方程序。
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