The inherency frequency and vibratory-type are calculated based on the modal analysis of the whole airframe.

对机身整体框架进行模态分析,求固有频率和振型。

If additional trainer aircraft are needed, the Pentagon plans to redesignate some of its existing rotorcraft rather than buying new airframes.

如果需要额训练机，五角大楼计划再次指派一些现有旋翼飞机而不是购买新。

Included in the transaction are three nonflying TP-3A aircraft to used as airframe spares and extra T-56 engines to support the 12 flyable aircraft.

这次交易包括三架不能飞TP-3A飞机进行机身备用，以及额T-56动机以支持12架可驾驶飞机。