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在使用梁-质量块模型计算飞行器扭转模态时,模型的扭转转动惯量模型对结构动特性的计算结果有着决定性的影响。研究了不同扭转转动惯量计算方法对系统扭转动力学特性的影响。首先,给出了三种转动惯量计算模型,其中包括一种精确模型和两种简化模型。其次,基于数据,建立了飞行器有限元模型。最后,基于给出的三种模型计算了飞行器的扭转模态。研究发现,对模型的局部扭转转动惯量进行修正,计算的扭转模态精度较高。
When using the beam-mass model to calculate the torsional mode of the aircraft, the torsional moment of inertia model of the model has a decisive influence on the calculation results of the structural dynamic characteristics. The influence of different torsional moment of inertia on the torsional dynamic characteristics of the system was studied. First, three models of moment of inertia calculation are given, including an exact model and two simplified models. Secondly, based on the data, a finite element model of the aircraft is established. Finally, the torsional modes of the aircraft are calculated based on the three models given. It is found that the local torsional moment of inertia of the model is corrected and the calculated torsional modal accuracy is high.