The authors present the results of the numerical experiments on the determination of the effect of shrouding coupling parameters in the rotor blades on their forced vibrations using an assembly of two blades as an example. The task is solved in the variation of the inclination angle of the shrouded flanges as the parameter of their contact interaction and amplitude of the kinematic excitation of vibrations caused by the harmonic displacement of the root section of the assembly. The displacement amplitude in the plane of the assembly vibrations and stress intensity in the blade airfoil is accepted as the characteristic of the forced blade vibrations. The finite element models of the blade assembly, which are based on the linear 8- and 4-nodal contact finite elements, are used to perform the investigation. The authors have obtained the dependencies of the selected characteristics of forced vibrations within the blade airfoil on the inclination angle of the contact surfaces of their shrouded flanges to the plane of rotation of the rotor wheel and level of kinematic excitation of the assembly vibrations. It is implied that the variation in the angle has a considerable effect on the stress state in the blades under investigation and it results in the occurrence of the local minimum of their forced vibration characteristics. Here the increase in the amplitude of the kinematic displacement of the root section in the assembly causes the increase of rigidity of the shrouded blade coupling and reduction in the triggered energy scatter.

中文翻译：

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护罩法兰接触表面取向和转子叶片振动激励水平对其振动应力状态的影响

作者以两个叶片为例，介绍了确定转子叶片中耦合参数对其强迫振动的影响的数值实验结果。解决该任务的方法是，将带罩法兰的倾角变化作为其接触相互作用的参数，以及由组件根部的谐波位移引起的振动的运动学激励振幅。组件振动平面中的位移幅度和叶片翼型中的应力强度被认为是强迫叶片振动的特征。叶片组件的有限元模型基于线性8节点和4节点接触有限元进行研究。作者已经获得了叶片翼型件中的强迫振动的选定特性与其覆盖凸缘的接触表面相对于转子轮的旋转平面的倾斜角以及组件振动的运动激励水平之间的依赖关系。暗示角度的变化对所研究的叶片中的应力状态具有相当大的影响，并且导致其强制振动特性的局部最小值的出现。在此，组件中根部区段的运动位移的幅度的增加导致带罩叶片联接的刚度的增加以及触发能量散布的减小。