基于SLDV技术的薄壁机匣三维全场模态测试方法
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摘要
提出了基于扫描式激光多普勒测振(SLDV)技术的薄壁机匣模态测试方法,实现了薄壁机匣的三维全场振动测试。基于LDV(laser Doppler vibrometry)测试原理,建立了机匣结构分片三维激光测量方法和拼接技术,实现了三维激光测试数据的处理,准确识别出了机匣的各阶模态参数,并与传统加速度传感器获取的测试结果进行了相关性分析。分析结果显示:两种测试结果的模态振型NCO(normalized cross orthogonality)值均在0.9左右,频差较小,验证了薄壁机匣扫描式激光多普勒三维全场测试的可行性和优越性。
A modal test method of casing was proposed based on scanning laser Doppler vibrometry(SLDV),and the 3D full-field vibration measurements of thin-wall casing were completed by studying laser Doppler vibrometry(LDV)measurement principle.A 3D laser measurement method for measuring each part of casing independently and a modal splicing technique were established,the data measured by 3D laser was processed and the modal parameters of casing were identified accurately.Modal correlation between SLDV measurement modes and conventional acceleration sensor measurement modes was analyzed.Results showed that normalized cross orthogonality(NCO)values were about 0.9 and the frequencies difference was very small,validating the feasibility and advantage of using the SLDV to measure the 3D full-field vibration of thin-wall casing.
A modal test method of casing was proposed based on scanning laser Doppler vibrometry(SLDV),and the 3D full-field vibration measurements of thin-wall casing were completed by studying laser Doppler vibrometry(LDV)measurement principle.A 3D laser measurement method for measuring each part of casing independently and a modal splicing technique were established,the data measured by 3D laser was processed and the modal parameters of casing were identified accurately.Modal correlation between SLDV measurement modes and conventional acceleration sensor measurement modes was analyzed.Results showed that normalized cross orthogonality(NCO)values were about 0.9 and the frequencies difference was very small,validating the feasibility and advantage of using the SLDV to measure the 3D full-field vibration of thin-wall casing.
引文
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[4] ALLEN M S,SRACIC M W.A new method for processing impact excited continuous-scan laser Doppler vibrometer measurements[J].Mechanical Systems and Signal Processing,2010,24(3):721-735.
[5] SRIRAM P,CRAIG J,HANAGUD S.A scanning laser Doppler vibrometer for modal testing[J].International Journal of Analytical and Experimental Modal Analysis,1990,5(3):155-167.
[6] SRIRAM P,CRAIG J,HANAGUD S.Scanning laser Doppler techniques for vibration testing[J].Experimental Techniques,1992,16(6):21-26.
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[8] TIRABASSI M,ROTHBERG S J.Scanning LDV using wedge prisms[J].Optics and Lasers in Engineering,2009,47(3):454-460.
[9] STANBRIDGE A B,MARTARELLI M,EWINS D J.Measuring area mode shapes with a scanning laser Doppler vibrometer[R].Bethel,Connecticut,USA:the 17th International Modal Analysis Conference,1999.
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[11] WARREN C,NIEZRECKI C,AVITABILE P,et al.Comparison of FRF measurement and mode shapes determined using optically image based,laser and accelerometer[J].Mechanical Systems and Signal Processing,2011,25(6):2191-2202.
[12] SEVER I A,STANBRIDGE A B,EWINS D J.Turbomachinery blade vibration measurements with tracking LDV under rotation[R].Ancona,Italy:the 7th International Conference on Vibration Measurements by Laser Techniques:Advances and Applications,2006.
[13] STANBRIDGE A B,MARTARELLI M,EWINS D J.Analysis of close mode shapes using a scanning LDV[R].Kissimmee,Florida,USA:IMAC-XIX Conference on Structural Dynamics,2001.
[14] SIRINGORINGO D M,FUJINO Y.Experiment study of laser Doppler vibrometer and ambient vibration for vibration-based damage detection[J].Engineering Structure,2006,28(13):1803-1815.
[15] MACKNELLY D J,IND P R.Component qualification using 3Dlaser vibrometry and transmissibility models[J].Experimental Techniques,Rotating Machinery,and Acoustics,2015,8:197-210.
[16] REYES J M,AVITABILE P.Use of 3Dscanning laser vibrometer for full field strain measurements[J].Experimental Techniques,Rotating Machinery,and Acoustics,2015,8:181-188.
[17] MARTARELLI M,REVEL G M,SANTOLINI C.Automated modal analysis by scanning laser vibrometry:problems and uncertainties associated with the scanning system calibration[J].Mechanical Systems and Signal Processing,2001,15(3):581-601.
[18] SAIRAJAN K K,AGLIETTI G S,WALKER S J I.Correlation of finite element models of multi-physics systems[J].Journal of Sound and Vibration,2014,333(17):4051-4070.
[2]马双超,臧朝平,兰海波.某航空发动机机匣的动力学模型修正[J].航空动力学报,2013,28(4):878-884.MA Shuangchao,ZANG Chaoping,LAN Haibo.Dynamic modal updating of an aero-engine casing[J].Journal of Aerospace Power,2013,28(4):878-884.(in Chinese)
[3]廖庆斌,李舜酩,朱丽娟.基于随机激励的某机匣模态实验与分析[J].航空动力学报,2005,20(6):932-936.LIAO Qingbin,LI Shunming,ZHU Lijuan.Modal experiment and analysis of an engine casing based on stochastic excitation[J].Journal of Aerospace Power,2005,20(6):932-936.(in Chinese)
[4] ALLEN M S,SRACIC M W.A new method for processing impact excited continuous-scan laser Doppler vibrometer measurements[J].Mechanical Systems and Signal Processing,2010,24(3):721-735.
[5] SRIRAM P,CRAIG J,HANAGUD S.A scanning laser Doppler vibrometer for modal testing[J].International Journal of Analytical and Experimental Modal Analysis,1990,5(3):155-167.
[6] SRIRAM P,CRAIG J,HANAGUD S.Scanning laser Doppler techniques for vibration testing[J].Experimental Techniques,1992,16(6):21-26.
[7] SRIRAM P,HANAGUD S,CRAIG J.Mode shape measurement using a scanning laser Doppler vibrometer[J].International Journal of Analytical and Experimental Modal Analysis,1992,7(3):168-178.
[8] TIRABASSI M,ROTHBERG S J.Scanning LDV using wedge prisms[J].Optics and Lasers in Engineering,2009,47(3):454-460.
[9] STANBRIDGE A B,MARTARELLI M,EWINS D J.Measuring area mode shapes with a scanning laser Doppler vibrometer[R].Bethel,Connecticut,USA:the 17th International Modal Analysis Conference,1999.
[10] PAUWELS S,BOUCART N,DIERCKX B,et al.Validation of a new non-iterative method for accurate position determination of a scanning laser vibrometer[R].Ancona,Italy:the 4th International Conference on Vibration Measurement by Laser Techniques,2000.
[11] WARREN C,NIEZRECKI C,AVITABILE P,et al.Comparison of FRF measurement and mode shapes determined using optically image based,laser and accelerometer[J].Mechanical Systems and Signal Processing,2011,25(6):2191-2202.
[12] SEVER I A,STANBRIDGE A B,EWINS D J.Turbomachinery blade vibration measurements with tracking LDV under rotation[R].Ancona,Italy:the 7th International Conference on Vibration Measurements by Laser Techniques:Advances and Applications,2006.
[13] STANBRIDGE A B,MARTARELLI M,EWINS D J.Analysis of close mode shapes using a scanning LDV[R].Kissimmee,Florida,USA:IMAC-XIX Conference on Structural Dynamics,2001.
[14] SIRINGORINGO D M,FUJINO Y.Experiment study of laser Doppler vibrometer and ambient vibration for vibration-based damage detection[J].Engineering Structure,2006,28(13):1803-1815.
[15] MACKNELLY D J,IND P R.Component qualification using 3Dlaser vibrometry and transmissibility models[J].Experimental Techniques,Rotating Machinery,and Acoustics,2015,8:197-210.
[16] REYES J M,AVITABILE P.Use of 3Dscanning laser vibrometer for full field strain measurements[J].Experimental Techniques,Rotating Machinery,and Acoustics,2015,8:181-188.
[17] MARTARELLI M,REVEL G M,SANTOLINI C.Automated modal analysis by scanning laser vibrometry:problems and uncertainties associated with the scanning system calibration[J].Mechanical Systems and Signal Processing,2001,15(3):581-601.
[18] SAIRAJAN K K,AGLIETTI G S,WALKER S J I.Correlation of finite element models of multi-physics systems[J].Journal of Sound and Vibration,2014,333(17):4051-4070.