Spectral subtraction-based filter for experimental modal analysis under harmonics excitation force

Che Ku Eddy Nizwan, Che Ku Husin and Mohd Fairusham, Ghazali and Ahmad Razlan, Yusoff (2021) Spectral subtraction-based filter for experimental modal analysis under harmonics excitation force. Journal of Mechanical Engineering and Sciences (JMES), 15 (4). pp. 8480-8489. ISSN 2289-4659 (print); 2231-8380 (online). (Published)

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In modal analysis, measurement of input force and vibration response are crucial to accurately measure the transfer function of the structure. However, under operating condition, the force induced by operating machinery is impossible to be measured due to the sensor placement issue. In this case, the ambient response induced by the operating force should be suppressed to minimize the error in the Frequency Response Function (FRF) calculation. This paper presents the utilization of a modified spectral subtraction filter for ambient suppression. The introduction of effective ambient magnitude in gain function calculation has increased the efficiency of spectral subtraction filter. This parameter is calculated based on the phase information of the reconstructed artificial ambient response. The measurement using EMA was carried out on a motor-driven structure to verify the proposed technique. Two sets of data under shutdown and running condition were recorded to observe the effect of ambient operating force. Under the operating condition, the measured FRF show the non-identical features at operating frequencies as compared to the baseline data. The utilization of filtering process shows the ambient features contained in the transfer function was effectively suppressed. The output of filtering algorithm could provide an alternative option to perform EMA procedure under running condition.

Item Type: Article
Uncontrolled Keywords: Condition monitoring; experimental modal analysis; adaptive filter; harmonics elimination
Subjects: T Technology > TJ Mechanical engineering and machinery
Faculty/Division: Faculty of Mechanical and Automotive Engineering Technology
College of Engineering
Depositing User: Mr. Che Ku Eddy Nizwan Che Ku Husin
Date Deposited: 07 Jan 2022 06:58
Last Modified: 07 Jan 2022 06:58
URI: http://umpir.ump.edu.my/id/eprint/33022
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