Research on Blade Synchronous Vibration Parameter Identification Using Blade Tip Timing without the once per Revolution Sensor

doi:10.3901/JME.2019.13.064

Abstract

Abstract: Blade tip timing (BTT) is considered a promising technique for monitoring blade vibration online for aero-engine. The majority of BTT measurement and analysis systems require a once-per revolution (OPR) sensor to generate a timing reference and measure the rotating speed of blades. However, one of the challenges in the development of BTT technique is that it's extremely difficult to install the OPR sensor and that the installation of the OPR sensor may cause potential security risks, leading to the failure of the existing BTT measurement. The method of synchronous vibration parameters identification, called two parameter plot method, is improved by mounting an additional BTT sensor and the amplitude and engine order (N_e) of blade vibration can be identified through analyzing the vibration displacement change. By numerical simulation and experiments, the results of vibration parameters identification are analyzed, which show validity and feasibility of the arithmetic. The work provides technology means of BTT measurement without the once per revolution sensor.

Key words: blade synchronous vibration, blade tip timing, OPR sensor, vibration parameters identification

CLC Number:

TH17
O329

ZHOU Changyi, HU Haifeng, YANG Yongmin, GUAN Fengjiao, XU Hailong. Research on Blade Synchronous Vibration Parameter Identification Using Blade Tip Timing without the once per Revolution Sensor[J]. Journal of Mechanical Engineering, 2019, 55(13): 64-71.

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