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叶片飞脱引起的转子不平衡瞬态响应是备受关注的重要问题之一。为研究某小型发动机叶片飞脱后的不平衡响应,在高速旋转试验台上进行叶片飞脱试验,测量转子的位移数据,并用高速相机记录叶片飞脱过程。运用传递矩阵法建立了单盘双支承转子系统的运动方程,用Newmark-β法积分求解,模拟了转子在双叶片顺序飞脱下的不平衡响应。试验和计算结果表明,叶片飞脱后的转子振动存在剧烈振荡、慢速涡动和平稳振动三个阶段。
Rotor imbalance caused by blade flight transient response is one of the important issues of great concern. In order to study the unbalanced response of a small engine blade after flying off, the blade flight test was carried out on a high-speed rotary test stand to measure the displacement data of the rotor. The flying process of the blade was recorded by a high-speed camera. The equations of motion of the single-disc dual-support rotor system are established by using the transfer matrix method. The integral equations of Newmark-β method are used to simulate the unbalanced responses of the rotor under the dual-blade sequential fly-off. The experimental results and the calculation results show that there are three phases of rotor vibration after blade flight: violent oscillation, slow vortex and steady vibration.