Repressing the effects of variable speed harmonic orders in operational modal analysis

被引:69
|
作者
Randall, R. B. [1 ]
Coats, M. D. [1 ]
Smith, W. A. [1 ]
机构
[1] Univ New S Wales, Sch Mech & Mfg Engn, Sydney, NSW 2052, Australia
关键词
Operational modal analysis; Variable speed; Harmonic order repression; Cepstral liftering;
D O I
10.1016/j.ymssp.2016.02.042
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
Discrete frequency components such as machine shaft orders can disrupt the operation of normal Operational Modal Analysis (OMA) algorithms. With constant speed machines, they have been removed using time synchronous averaging (TSA). This paper compares two approaches for varying speed machines. In one method, signals are transformed into the order domain, and after the removal of shaft speed related components by a cepstral notching method, are transformed back to the time domain to allow normal OMA. In the other simpler approach an exponential shortpass lifter is applied directly in the time domain cepstrum to enhance the modal information at the expense of other disturbances. For simulated gear signals with speed variations of both +/- 5% and +/- 15%, the simpler approach was found to give better results The TSA method is shown not to work in either case. The paper compares the results with those obtained using a stationary random excitation. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:3 / 15
页数:13
相关论文
共 50 条
  • [1] Operational modal analysis in the presence of harmonic excitation
    Mohanty, P
    Rixen, DJ
    JOURNAL OF SOUND AND VIBRATION, 2004, 270 (1-2) : 93 - 109
  • [2] Harmonic and modal frequency discrimination in time domain operational modal analysis
    Vu, V. H.
    Thomas, M.
    Lafleur, F.
    MECHANICS & INDUSTRY, 2014, 15 (01) : 29 - 37
  • [3] Detection and removal of harmonic components in operational modal analysis
    Xia, Zunping
    Wang, Tong
    Zhang, Lingmi
    JOURNAL OF VIBROENGINEERING, 2017, 19 (07) : 5278 - 5289
  • [4] Operational Modal Analysis in the Presence of Harmonic Excitations: A Review
    Motte, Kenny
    Weijtjens, Wout
    Devriendt, Christof
    Guillaume, Patrick
    DYNAMICS OF CIVIL STRUCTURES, VOL 2, 2015, : 379 - 395
  • [5] Harmonic scaling of mode shapes for operational modal analysis
    Brandt, A.
    Berardengo, M.
    Manzoni, S.
    Cigada, A.
    PROCEEDINGS OF ISMA2016 INTERNATIONAL CONFERENCE ON NOISE AND VIBRATION ENGINEERING AND USD2016 INTERNATIONAL CONFERENCE ON UNCERTAINTY IN STRUCTURAL DYNAMICS, 2016, : 2809 - 2818
  • [6] A method for the harmonic removal in operational modal analysis of rotating blades
    Agneni, Alessandro
    Coppotelli, Giuliano
    Grappasonni, Chiara
    MECHANICAL SYSTEMS AND SIGNAL PROCESSING, 2012, 27 : 604 - 618
  • [7] Harmonic mode identification in the operational modal analysis and its application
    Zhang, Yimin
    Zhang, Shouyuan
    Li, He
    Wen, Bangchun
    Zhendong Ceshi Yu Zhenduan/Journal of Vibration, Measurement and Diagnosis, 2008, 28 (03): : 197 - 200
  • [8] Operational modal analysis of a ship model in the presence of harmonic excitation
    Xu J.
    Hong M.
    Liu X.
    Journal of Marine Science and Application, 2013, 12 (1) : 38 - 44
  • [9] Identifying mode shapes and modal frequencies by operational modal analysis in the presence of harmonic excitation
    P. Mohanty
    D. J. Rixen
    Experimental Mechanics, 2005, 45 (3) : 213 - 220
  • [10] Identifying mode shapes and modal frequencies by operational modal analysis in the presence of harmonic excitation
    Mohanty, P
    Rixen, DJ
    EXPERIMENTAL MECHANICS, 2005, 45 (03) : 213 - 220