航空发动机主轴轴承剥落扩展试验

Experimental for Spalling Propagation of Aeroengine Spindle Bearings

为探索轴承的剥落极限,开展了航空发动机主轴轴承的剥落扩展试验研究。介绍了轴承损伤的形式以及国内外关于疲劳剥落损伤的研究现状;介绍了试验轴承的初始剥落状态以及试验器的基本情况,明确了轴承的润滑条件和监测方式;按照发动机的真实工况和载荷谱制定试验方案并开展试验,定期分解监控轴承的剥落扩展趋势;对试验过程中金属屑末质量分数、轴承温度以及转子振动的监测结果进行了分析。结果表明:小面积剥落的轴承在18 h试验时间内仍能继续工作,轴承温升未发生明显改变,轴承外圈温度大部分时间内保持在150~190℃,但金属屑末质量分数及转子振动时域幅值不断增大,金属屑末累计增长约9500个,振动时域幅值已超过600g。各项参数的监测结果对发动机地面试车或飞行具有重要的参考价值。

The spalling propagation experimental research for aeroengine spindle bearing has been developed in order to exploring the spalling limit of bearing.The form of bearing damage and the current research status on fatigue peeling damage both demestically and internationally have been introduced.The initial spalling state of the test bearing and the basic situation of the tester have been introduced.The lubrication condition and monitoring mode of the bearing have been defined.The test scheme has been formulated and deceloped according to the real working conditions and load spectrum of the engine.The tendency of spalling bearing has been monitored by periodic disassembly The monitoring results of metal chip content,bearing temperature and rotor vibration during the test have been analyzed.The test results show that the bearing with small area peeling can continue working in the 18h of testing time,and the temperature rise is not be changed significantly,the temperature of the outer ring of the bearing remain at 150~190℃for most of time,but the content of metal chips and the time domain amplitude of rotor vibration are increasing,the growth of metal chips is about 9500 and the time domain amplitude of rotor vibration is about 600g.The monitoring results of various parameters have important reference value for subsequent engine ground test or flight.