给出判定平衡稳定性的一次近似方法及其判据；
The stability criteria for the equilibrium state are obtained.
在一次近似中，得到了一个有效的求解板的基频近似值的方法。
In the case of first-order approximation, an effective method for obtaining t...
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.
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