Blade tip timing(BTT)is an advanced online vibration monitoring method for rotating blades,but its measurement accuracy is greatly affected by the change of the sensing position.Therefore,how to select appropriate sensing points has important research value.In order to explore the impact of blade vibration on the sensing position under fluid-structure interaction,vortex steps were generated in the flow field around a cylinder and the torsional vibrations of rotating blades under different speeds and crack posi-tions were studied.Torsional vibrations of normal blades and cracked blades were calculated and compared under different centrifugal loads and fluid-structure interaction.Furthermore,the effects of the torsional off-set at the blade tip on the BTT sensing position were discussed.The simulation results show that the rota-tional speed and crack location have significant impacts on the torsional vibrations of the rotating blade under fluid-structure interaction.When the speed is low,the BTT vibration sensor should be installed near the leading edge of the blade.When the speed is high,it should be installed in the middle position near the blade tip.
关键词
叶端定时/振动监测/旋转叶片/测点位置/流固耦合
Key words
tip timing/vibration monitoring/rotating blade/sensing position/fluid-structure interaction
维普
万方数据