燃气轮机刷丝与平衡盘碰摩的振动故障诊断

Vibration Failure Diagnose of Fraction between Gas Turbine Brush and Balance Plate

针对某型航改燃气轮机压气机机匣振动超限故障,通过时频和振动幅值趋势分析,结合分解检查结果进行了试验验证,发现平衡盘端面与刷环刷丝之间发生碰摩为根本原因,碰摩形式与传统涡轮叶尖与外环块之间的碰摩形式截然不同。通过定性分析发现,激振力主要通过低压涡轮输出轴传递,且因受№1支点的"杠杆"作用,对振动响应进行了放大;碰摩产生的激振力大小主要与引气量和二者间隙相关,刷环刷丝的表面刚性是随引气量变化的变刚度过程,分析了在燃气轮机动力涡轮转速稳定后,压气机动力涡轮基频幅值随燃气发生器转速提高而继续增大的原因,最后得到力学模型和运动方程。

Aiming at vibration transmitting failure of compressor casing for an aero-derivative turbine, the experiment was verified with decomposition inspection by analyzing the time-frequency and vibration amplitude. The vibration is the fundamental reason between the balance plate and brush, which is different from the vibration between the blade tip and external ring. The qualitative analysis found that the vibrating force is transferred through the low gas turbine shaft, which magnified the vibration response by lYol pivot. The vibration force is associated with the leading gas quantity and those clearance, and the rigidity of brush is a changing course along with leading gas quantity. After gas turbine low compressor rotate speed stabilize, it was explained that vibration magnitude of low compressor rotor based frequency continued to get high along with high compressor rotate speed heighten, and it describes dynamic model and movement equation finally.