燃气涡轮试验与研究
燃氣渦輪試驗與研究
연기와륜시험여연구
GAS TURBINE EXPERIMENT AND RESEARCH
2014年
4期
42-47
,共6页
航空发动机%截断效应%阶比分析%等角度采样%阶次谱
航空髮動機%截斷效應%階比分析%等角度採樣%階次譜
항공발동궤%절단효응%계비분석%등각도채양%계차보
aero-engine%truncation effect%order tracing%uniform angle sampling%order spectrum
试飞中发动机振动信号处理时,需获得各转子阶次谐波分量的准确幅值,以便对发动机振动进行评估和监视。针对该问题,对阶比分析技术在该领域的具体应用进行了研究,并给出了实现方法。该方法采用sinc函数插值的方法,将等时间间隔采样的离散数据序列转换为等角度采样的离散数据序列,随后对等角度采样后的数据序列进行快速傅里叶变换(FFT)和谐波分解,来获得信号阶次谱。分析结果表明,给出的实现方法消除了FFT分析的截断效应,提高了阶次谱分量幅值的分析精度。
試飛中髮動機振動信號處理時,需穫得各轉子階次諧波分量的準確幅值,以便對髮動機振動進行評估和鑑視。針對該問題,對階比分析技術在該領域的具體應用進行瞭研究,併給齣瞭實現方法。該方法採用sinc函數插值的方法,將等時間間隔採樣的離散數據序列轉換為等角度採樣的離散數據序列,隨後對等角度採樣後的數據序列進行快速傅裏葉變換(FFT)和諧波分解,來穫得信號階次譜。分析結果錶明,給齣的實現方法消除瞭FFT分析的截斷效應,提高瞭階次譜分量幅值的分析精度。
시비중발동궤진동신호처리시,수획득각전자계차해파분량적준학폭치,이편대발동궤진동진행평고화감시。침대해문제,대계비분석기술재해영역적구체응용진행료연구,병급출료실현방법。해방법채용sinc함수삽치적방법,장등시간간격채양적리산수거서렬전환위등각도채양적리산수거서렬,수후대등각도채양후적수거서렬진행쾌속부리협변환(FFT)화해파분해,래획득신호계차보。분석결과표명,급출적실현방법소제료FFT분석적절단효응,제고료계차보분량폭치적분석정도。
While vibration data is processed in aero-engine flight tests, the accurate amplitude of the rotors is required for vibration analysis and monitor. In this paper, how to use order tracing technology to solve aero-engine vibration data processing problem in flight tests was studied carefully;moreover the realizable or-der tracing numerical algorithm was presented too. Sinc function interpolation method was used to get the sampling angles discrete data sequence from sampling time span. Then FFT and harmonic decomposition was complied on the new data sequence to obtain the signal order spectrum. The analysis results show that the presented method can avoid the truncation effect, and improve the accuracy of the order amplitude analysis.