Accurate measurement of blade vibration with the use of fewer sensors and more compact installation space is indispensable for engineering applications. Based on the measurement method of BTT, the combination of the nonlinear least squares fitting and GARIV method is proposed and experimentally studied to identify the synchronous vibration parameters of blade. A high-speed straight blade test bench was established (the maximum speed is 45000rpm, and the blade tip velocity is 322.8m/s). In the experimental study, the parameter identification of synchronous vibration of blade is completed and the Campbell diagram of blade vibration is accurately plotted under the excitation of six magnets. Meanwhile, the experimental study and analysis on the harmonic vibration of blade with different numbers of excitation. The deviation of the dynamic frequency of blade between experimental result and simulation result is less than 6%. This method can provide a technical approach for blade fault early warming and non-contact measurement of dynamic stress.
Key words
BTT /
GARIV /
synchronous vibration /
parameter identification
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References
[1] 王萍. 叶尖定时方法在国外航空发动机叶片振动测量中的应用综述[J]. 航空科学技术, 2013 (6): 5-9.
WANG Ping. Application review of blade tip timing method for foreign aero-engine blade vibration measurement[J]. Aeronautical Science & Technology, 2013(6):5-9.
[2] Russhard P. Development of a blade tip timing based engine health monitoring system[D]. Manchester: Manchester University, 2010.
[3] Carrington I B. Development of blade tip timing data analysis techniques[D]. Manchester: University of Manchester, 2002.
[4] 欧阳涛. 基于叶尖定时的旋转叶片振动检测及参数辨识技术[D]. 天津: 天津大学, 2011.
OUYANG Tao. Rotating blade vibration detection and parameters identification technique using blade tip-timing[D]. Tianjin: Tianjin University, 2011.
[5] 张玉贵, 段发阶, 方志强, 等. 间断相位法测量叶片同步振动幅值的研究[J]. 振动与冲击, 2008, 27(10): 183-186.
ZHANG Yugui, DUAN Fajie, FANG Zhiqiang, et al. Measuring synchronous vibration of rotating blades using discontinuous phase method[J]. Journal of Vibration and Shock, 2008, 27(10): 183-186.
[6] 欧阳涛, 郭文力, 段发阶, 等. 基于叶尖定时的旋转叶片同步振动辨识新方法[J]. 振动与冲击, 2011, 30(08): 249-252.
OUYANG Tao, GUO Wenli, DUAN Fajie, et al. New method for identifying rotating blades synchronous vibration based on tip-timing[J]. Journal of Vibration and Shock, 2011, 30(08): 249-252.
[7] Carrington I B. Development of blade tip timing data analysis techniques[D]. Manchester: University of Manchester, 2002.
[8] Dimitriadis G, Carrington I B, Wright J R, et al. Blade-tip timing measurement of synchronous vibration of rotating bladed assemblies[J]. Mechanical Systems and Signal Processing, 2002.16(4): 599-622.
[9] Pickering T M. Methods for Validation of a Turbomachinery Rotor Blade Tip Timing System[D]. Blacksburg Virginia Tech University, 2014.
[10] Mansisidor M R. Resonant blade response in turbine rotor spin tests using a laser-light probe non-intrusive measurement system[R]. Naval postgraduate school monterey ca, 2002.
[11] Freund O, Bartelt M, Mittelbach M, et al. Impact of the flow on an acoustic excitation system for aeroelastic studies[J]. Journal of turbomachinery, 2013, 135(3): 583-595.
[12] Freund O, Montgomery M, Mittelbach M, et al. Non-contact test set-up for aeroelasticity in a rotating turbomachine combining a novel acoustic excitation system with tip-timing[J]. Measurement Science and Technology, 2014, 25(3): 116-121.
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