This paper analyzed 11 lubricating oil 50-1-4Ф samples of different base oil content （standard oil） and 28 used oil samples by Fourier transform mid-infrared spectrometer （FTIR）. First, the absorption peak of 1 4...This paper analyzed 11 lubricating oil 50-1-4Ф samples of different base oil content （standard oil） and 28 used oil samples by Fourier transform mid-infrared spectrometer （FTIR）. First, the absorption peak of 1 465 cm 1 was selected as the characteristic peak for determining their kinematic viscosities. And then correlation of the kinematic viscosity and the absorbance at characteristic peaks of corresponding infrared spectrum of standard oil and used oil samples was analyzed, re- spectively, and two regression equations were proposed. Finally, the regression equation of standard oil was corrected through other 20 new oil samples. The results show that determining kinematic viscosity of new lubricating oil 50-1-4Ф and the used one by FTIR is feasible and reliable.展开更多
A series of aviation lubrication oil 50-1-4φ samples were prepared with different RP-3 content, and then these sam- ples were analyzed by Fourier transform mid-infrared spectrometer （FTIR）. The infrared region of ...A series of aviation lubrication oil 50-1-4φ samples were prepared with different RP-3 content, and then these sam- ples were analyzed by Fourier transform mid-infrared spectrometer （FTIR）. The infrared region of 805--755 cm-1 was selected as quantitative area for determining fuel pollution level of aviation lubrication oil. Finally, correlation of the testing peak area and the fuel pollution level of corresponding samples were analyzed, and the regression equation was proposed. The results show that determining jet fuel pollution level of aviation lubricating oil by FTIR is feasible and reliable.展开更多
飞机液压系统故障诊断是飞机故障预测与健康管理(Prognostics and Health Management,PHM)领域的难点。随着液压系统向高压化方向发展,其渗漏、增温、压力脉动导致的管道断裂,以及回油压力过高等诸多液压系统的致命故障发生的概率增加...飞机液压系统故障诊断是飞机故障预测与健康管理(Prognostics and Health Management,PHM)领域的难点。随着液压系统向高压化方向发展,其渗漏、增温、压力脉动导致的管道断裂,以及回油压力过高等诸多液压系统的致命故障发生的概率增加。通过液压系统试验台构成分析及仿真验证,建立了完善的飞机液压系统故障模拟试验台。制订液压系统故障模拟试验方案,在模拟试验台完成试验。采集正常状态、不同工况、预置故障试验和加速寿命试验的数据,获得可靠的飞机液压系统关键征兆参数。通过对比分析不同工况数据的时频特征,确定均方根可用于时域故障特征分析,小波包能量谱可用于频域故障特征分析。利用时频故障特征,通过正常及预置故障试验数据,验证了所提出的检测方法的有效性。展开更多
文摘This paper analyzed 11 lubricating oil 50-1-4Ф samples of different base oil content （standard oil） and 28 used oil samples by Fourier transform mid-infrared spectrometer （FTIR）. First, the absorption peak of 1 465 cm 1 was selected as the characteristic peak for determining their kinematic viscosities. And then correlation of the kinematic viscosity and the absorbance at characteristic peaks of corresponding infrared spectrum of standard oil and used oil samples was analyzed, re- spectively, and two regression equations were proposed. Finally, the regression equation of standard oil was corrected through other 20 new oil samples. The results show that determining kinematic viscosity of new lubricating oil 50-1-4Ф and the used one by FTIR is feasible and reliable.
文摘A series of aviation lubrication oil 50-1-4φ samples were prepared with different RP-3 content, and then these sam- ples were analyzed by Fourier transform mid-infrared spectrometer （FTIR）. The infrared region of 805--755 cm-1 was selected as quantitative area for determining fuel pollution level of aviation lubrication oil. Finally, correlation of the testing peak area and the fuel pollution level of corresponding samples were analyzed, and the regression equation was proposed. The results show that determining jet fuel pollution level of aviation lubricating oil by FTIR is feasible and reliable.
文摘飞机液压系统故障诊断是飞机故障预测与健康管理(Prognostics and Health Management,PHM)领域的难点。随着液压系统向高压化方向发展,其渗漏、增温、压力脉动导致的管道断裂,以及回油压力过高等诸多液压系统的致命故障发生的概率增加。通过液压系统试验台构成分析及仿真验证,建立了完善的飞机液压系统故障模拟试验台。制订液压系统故障模拟试验方案,在模拟试验台完成试验。采集正常状态、不同工况、预置故障试验和加速寿命试验的数据,获得可靠的飞机液压系统关键征兆参数。通过对比分析不同工况数据的时频特征,确定均方根可用于时域故障特征分析,小波包能量谱可用于频域故障特征分析。利用时频故障特征,通过正常及预置故障试验数据,验证了所提出的检测方法的有效性。
