1200mm叶片的非线性摩擦减振特性

Nonlinear Performance of Decreasing Vibration by Friction on the Effect of Outside Vibration-exciting Force

根据国内外同行多年设计经验,综合考虑安全性、经济性与工艺性,设计了1200mm长叶片的结构,其中静叶为变截面空间三维弯扭联合成型叶片;动叶为考虑大变形、附加动应力最小的变截面空间反扭成型叶片;动叶的拉筋和围带设计成自带凸台拉筋和自带围带整圈软联接;叶根方案确定为斜四齿枞树型。在此基础上采用固定界面模态综合法计算了整圈叶片的非线性振动响应。设计与计算结果表明:采用自带凸台拉筋和自带围带整圈软联接结构形式的1200mm长叶片,在外激振力作用下,具有良好的摩擦减振性能。

On the basis on the design experience of researchers in this field of the whole world and synthetically considering safety, economy and technology, the confignration of 1 200ram long blade is designed. The spatial 3D bowed and twisted molding with non-uniform section profiles is applied to the stator blade design. The large deformation, the spatial negatively twisted molding with equal strength section profile under minimum dynamic stress, the soft link of the owned lashing wire with convexity and the owned shroud ring, and the oblique 4 teeth-based blade root of fir type are all considered in the rotor blade design. On the basis of this, Applying the constant interface modal comprehensive method calculates the nonlinear vibration modal of the circle blade. The result of design and calculation indicates that the 1 200mm long blade owned lashing wire with convexity and the owned shroud ring has good performance of decreasing vibration by friction on the effect of outside vibration-exciting force.