Research on Identification Method of Foreign Object Impact of Aero-engine Fan Blade
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摘要: 通过风扇叶片外物撞击试验平台来模拟真实发动机叶片受外物撞击的过程,使用基于叶尖定时原理的非接触式叶尖振动测量方法获取叶片叶尖振动信号。采用基于短时能量的方法对原始振动信号进行处理,获取风扇不同稳定转速状态所对应的叶尖振动参考短时能量值,经过反复试验及数据统计分析给定门限系数,依据在线检测原理获取外物撞击风扇叶片的检测门限值。对不同尺寸、质量外物撞击给定风扇转速的叶片振动数据进行分析,获取其对应的短时能量分布,进而准确判断出叶片发生外物撞击的时刻、次数。Abstract: The process of engine blade impacted by foreign objects is simulated by a fan blade foreign object damage (FOD) test platform. The non-contact tip vibration measurement method based on tip timing principle is used to obtain blade tip vibration signal. By processing the original vibration signal based on the short-term energy method, the reference short-term energy values of tip vibration corresponding to different steady speed states of the fan can be obtained. After repeated tests and data statistics, the threshold coefficient is given, and the detection threshold value of foreign objects impacting fan blades is obtained according to the principle of on-line detection. The vibration data of blades with different sizes and masses impacting at a given fan speed are analyzed, and the corresponding short-term energy distribution is obtained, and then the time and number of impacts are estimated accurately.
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Key words:
- aero-engine /
- tip vibration /
- foreign object impact /
- non-contact measurement /
- short-term energy /
- on-line detection
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表 1 转速4 000 r/min各传感器对应的短时能量分布
试验 S0 S1 S2 S3 1# 1.632 1.49 1.178 1.421 2# 1.680 1.98 1.427 1.544 3# 1.665 1.305 1.790 1.535 -
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