分数阶Fourier变换在某型涡轴发动机喘振分析中的应用
Application of fractional Fourier transform in one turbine-shaft engine surge analyse
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摘要: 基于分数阶Fourier变换(FRFT)时-频分析理论的特点, 构造信号验证了FRFT能解除时频偶合的特性.在此基础上, 采用FRFT对某涡轴发动机典型的喘振试验数据进行喘振特征信号提取, 然后基于有效特征信号的FRFT功率谱进行喘振瞬时频率的估计.结果表明:利用旋转角与喘振特征相匹配分数阶Fourier变换的能量聚集特性, 能有效提取发动机喘振特征信号, 并能利用FRFT结果, 采用最优信号提取旋转角下的FRFT功率谱进行喘振瞬时频率的估计.
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关键词:
- 涡轴发动机 /
- 喘振 /
- 分数阶Fourier变换(FRFT) /
- 试验 /
- 瞬时频率
Abstract: The article constructed signal to simulate the fractional Fourier transform(FRFT)'s characteristics of time-frequency analysis and validated that FRFT can relieve time and frequency coupling effectively.Then, typical surge experiment data of a turbine-shaft engine were processed using FRFT in order to pick up surge characteristic signal.With the FRFT energy spectrum of the surge characteristic signal, we evaluated the instantaneous surge frequency.The results show that using the characteristics of FRFT's energy congregation in the rotary angle, which matches with the engine surge's peculiarity, helps pick up the engine's surge characteristics signal effectively;using the FRFT energy spectrum helps estimate the instantaneous surge frequency.-
Key words:
- turbine-shaft engine /
- surge /
- fractional Fourier transform(FRFT) /
- experiment /
- instantaneous frequency
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