二次近似解达到薄壳理论所具有的精度，一次近似解也具有足够精度。
The second approximation of the solution is of the same accuracy as theory of thin shells, and the first approximation is also sufficiently precise for engineering computation.
本文把缩减弯曲刚度法推广应用于具有不同拉压模数的层板，并且提出了一种求解具有不同拉压模数的层板问题的新的近似方法——二次近似法。
The reduced bending stiffness method is extended to laminates with different moduli in tension and compression, and a new approximate method-twice-approximate method is presented in this paper.
引进一个随机线性二次最优控制问题作为原问题的近似问题。
A stochastic linear_quadratic control problem is introduced as auxiliary problem of the initial problem.
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