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
  • [31] High-Speed Camera Based Methods for Experimental and Operational Modal Analysis
    Zaletelj, Klemen
    Gorjup, Domen
    Slavic, Janko
    PROCEEDINGS OF THE 10TH INTERNATIONAL OPERATIONAL MODAL ANALYSIS CONFERENCE, VOL 1, IOMAC 2024, 2024, 514 : 491 - 498
  • [32] Modal Analysis of High Power Variable Speed Hydrodynamic Coupling Impellers
    Zhang, Rui
    Ma, Wenxing
    Lu, Xiuquan
    SUSTAINABLE CONSTRUCTION MATERIALS AND COMPUTER ENGINEERING, 2012, 346 : 236 - 240
  • [33] A modified Ibrahim time domain algorithm for operational modal analysis including harmonic excitation
    Mohanty, P
    Rixen, DJ
    JOURNAL OF SOUND AND VIBRATION, 2004, 275 (1-2) : 375 - 390
  • [34] Separation of structural modes and harmonic frequencies in Operational Modal Analysis using random decrement
    Modak, S. V.
    MECHANICAL SYSTEMS AND SIGNAL PROCESSING, 2013, 41 (1-2) : 366 - 379
  • [35] An application of operational modal analysis in modal filtering
    Kurowski, Piotr
    Mendrok, Krzysztof
    Uhl, Tadeusz
    9TH INTERNATIONAL CONFERENCE ON DAMAGE ASSESSMENT OF STRUCTURES (DAMAS 2011), 2011, 305
  • [36] Uncertainties on modal parameters by operational modal analysis
    Viet Hung Vu
    Thomas, Marc
    MECHANICS & INDUSTRY, 2014, 15 (02) : 153 - 158
  • [37] MODAL MASS IN CLASSICAL AND OPERATIONAL MODAL ANALYSIS
    Aenlle, M.
    Pelayo, F.
    Brincker, R.
    8TH IOMAC INTERNATIONAL OPERATIONAL MODAL ANALYSIS CONFERENCE, 2019, : 471 - 480
  • [38] Modes in operational modal analysis
    Zhang, Yi-Min
    Zhang, Shou-Yuan
    Li, He
    Wen, Bang-Chun
    Zhendong yu Chongji/Journal of Vibration and Shock, 2009, 28 (01): : 64 - 67
  • [39] Bayesian Operational Modal Analysis
    Au, S. K.
    IDENTIFICATION METHODS FOR STRUCTURAL HEALTH MONITORING, 2016, 567 : 117 - 135
  • [40] Operational Modal Analysis of tyre road interaction using Abaqus Explicit and Operational Modal Analysis
    Sakthivel, P.
    Rao, K. V. Narasimha
    Kumar, R. Krishna
    PROCEEDINGS OF INTERNATIONAL CONFERENCE ON NOISE AND VIBRATION ENGINEERING (ISMA2012) / INTERNATIONAL CONFERENCE ON UNCERTAINTY IN STRUCTURAL DYNAMICS (USD2012), 2012, : 1603 - 1615