The 3d exact equations to solve free vibration of the cylindrical shell were obtained by using power series expansion method.
用幂级数展开法得到了求解该圆柱形梯度壳自由振动的三维精确公式。
The method is composed of two parts, the series expansion method in the transonic region and the characteristics method in the supersonic region.
该法由两部分组成，跨音速段用级数解，超音速段用特征线法。
Emphasis is laid on the analysis, of large nonlinearities in system, for example, the FPK method, the closure method and the functional series expansion method.
重点是具有较大非线性的系统的方法，如FPK法，矩闭合法和函数级数法。
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