高速转动壳体行波振动实验研究

本文对轴对称薄壁壳结构的振动特性进行了试验研究。对一圆柱薄壳在静止状态和高速旋转状态下进行了模态试验。试验结果验证了轴对称薄壁壳在转动状态下，由于科氏力的影响，同一模态在转动坐标系中，存在不同频率的前后行波。为理论计算和发生在航空发动机中转动薄壁件振动设计，提供了可靠的试验依据。

EXPERIMENTAL INVESTIGATION ON TRAVELLING WAVE VIBRATION OF HIGH-SPEED ROTATING SHELL

The experimental investigation on vibration characteristics of thin cylindrical shell with axial symmetry has been performed.The experimental modal analyses have been done under static condition and high-speed rotating condition for a given thin cylindrical shell by using shock vibration excitation method.The experimental results indicate that the vibration characteristics of the rotating thin cylindrical shell are different from those of rotating disk.For the former,due to the effect of Coriolis,there exist forward and backward travelling wave vibrations with different frequencies in view of rotating coordinate system and the frequency differences between two travelling waves are in a linear relationship with rotating speeds.The experimental results have a good agreement with the theoretical analysis,and it is very useful for the vibration design of a rotating cylindrical shell for turbine engine.