采用最优性准则方法，给合结构优化设计中的双因子算法，有效地解决了给定弹性机构某几阶固有频率时设计构件截面参数这类逆特征值问题。

Combining with the optimality criterion method and the bi-factor algorithm, the inverse eigenvalue problem for optimal Parameters design of elastic mechanisms is solved effectively.

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采用该设计方法，以典型民机机身下部结构设计问题为算例，对客舱地板支撑结构，货舱地板和泡沫构件形状参数进行优化。

Using this design approach, a typical civil aircraft fuselage structural design with the shape parameters of the cabin floor struts, cargo floor and foam components has been studied as design case.

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