The inherency frequency and vibratory-type are calculated based on the modal analysis of the whole airframe.
对身整体框架进行模态分析,求解固有频率和振型。
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Although four-engine operation would be more efficient, upgrading the airframe to run with only four engines would necessitate further alterations to the aircraft's systems and control surfaces especially the rudder, extending the project's duration, cost, and complexity.
尽管四引擎运行效率更高,将升级为仅使用四引擎运行将需要对飞的统和控制面(尤其是方向舵)进行进一步改造,从而延长了项目的持续时间、本和复杂性。