As an alternative to operational modal analysis and classical experimental modal analysis (EMA), a novel method was introduced previously, namely impact-synchronous modal analysis (ISMA). The effectiveness ISMA on rotor and structural dynamic systems has been proven in previous literature. More recently, an automated impact device (AID) was introduced which utilized tachometer pulse as initiation signal and its effectiveness on ISMA was proven. An attempt to further enhance this device in term of equipment and cost is then proposed by replacing the tachometer with the in-use tri-axial accelerometer through utilizing the filtered response of cyclic load component as an initiation signal to control the impact device, which is also the primary aim for this study. Prior to modal testing, accuracy of this device is illustrated at desired phase angles of 0 deg, 90 deg, 180 deg, and 270 deg. Subsequently, frequency response function (FRF) estimations obtained for ISMA using enhanced AID has demonstrated the suppression capabilities of this device on disturbances, i.e., reduction of 93.58% at 30 Hz and 57.78% at 60 Hz, resulting in a high correlation for signature assurance criterion (SAC) and cross signature assurance criterion (CSAC). Modal parameters extracted from the EMA and ISMA using impact device are presented and compared, for the first three natural modes of the test rig. It is found that natural frequencies are deviating by less than 6%, whereas modal assurance criterion (MAC) values between the mode shapes of the two tests are found to be above 0.9.
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March 2019
Technical Briefs
A Performance Study of Controlled Impact Timing on Harmonics Reduction in Operational Modal Testing
Hong Cheet Lim,
Hong Cheet Lim
Mechanical Engineering Department,
Faculty of Engineering,
University of Malaya,
Kuala Lumpur 50603, Malaysia
e-mail: h_chet_l@siswa.um.edu.my
Faculty of Engineering,
University of Malaya,
Kuala Lumpur 50603, Malaysia
e-mail: h_chet_l@siswa.um.edu.my
Search for other works by this author on:
Zhi Chao Ong,
Zhi Chao Ong
Mechanical Engineering Department,
Faculty of Engineering,
University of Malaya,
Kuala Lumpur 50603, Malaysia
e-mails: zhichao83@gmail.com; alexongzc@um.edu.my
Faculty of Engineering,
University of Malaya,
Kuala Lumpur 50603, Malaysia
e-mails: zhichao83@gmail.com; alexongzc@um.edu.my
Search for other works by this author on:
Zubaidah Ismail,
Zubaidah Ismail
Civil Engineering Department,
Faculty of Engineering,
University of Malaya,
Kuala Lumpur 50603, Malaysia
e-mail: zu_ismail@um.edu.my
Faculty of Engineering,
University of Malaya,
Kuala Lumpur 50603, Malaysia
e-mail: zu_ismail@um.edu.my
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Shin Yee Khoo
Shin Yee Khoo
Mechanical Engineering Department,
Faculty of Engineering,
University of Malaya,
Kuala Lumpur 50603, Malaysia
e-mail: khooshinyee@um.edu.my
Faculty of Engineering,
University of Malaya,
Kuala Lumpur 50603, Malaysia
e-mail: khooshinyee@um.edu.my
Search for other works by this author on:
Hong Cheet Lim
Mechanical Engineering Department,
Faculty of Engineering,
University of Malaya,
Kuala Lumpur 50603, Malaysia
e-mail: h_chet_l@siswa.um.edu.my
Faculty of Engineering,
University of Malaya,
Kuala Lumpur 50603, Malaysia
e-mail: h_chet_l@siswa.um.edu.my
Zhi Chao Ong
Mechanical Engineering Department,
Faculty of Engineering,
University of Malaya,
Kuala Lumpur 50603, Malaysia
e-mails: zhichao83@gmail.com; alexongzc@um.edu.my
Faculty of Engineering,
University of Malaya,
Kuala Lumpur 50603, Malaysia
e-mails: zhichao83@gmail.com; alexongzc@um.edu.my
Zubaidah Ismail
Civil Engineering Department,
Faculty of Engineering,
University of Malaya,
Kuala Lumpur 50603, Malaysia
e-mail: zu_ismail@um.edu.my
Faculty of Engineering,
University of Malaya,
Kuala Lumpur 50603, Malaysia
e-mail: zu_ismail@um.edu.my
Shin Yee Khoo
Mechanical Engineering Department,
Faculty of Engineering,
University of Malaya,
Kuala Lumpur 50603, Malaysia
e-mail: khooshinyee@um.edu.my
Faculty of Engineering,
University of Malaya,
Kuala Lumpur 50603, Malaysia
e-mail: khooshinyee@um.edu.my
1Corresponding author.
Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT,AND CONTROL. Manuscript received July 5, 2017; final manuscript received September 27, 2018; published online November 8, 2018. Assoc. Editor: Douglas Bristow.
J. Dyn. Sys., Meas., Control. Mar 2019, 141(3): 034501 (6 pages)
Published Online: November 8, 2018
Article history
Received:
July 5, 2017
Revised:
September 27, 2018
Citation
Lim, H. C., Ong, Z. C., Ismail, Z., and Khoo, S. Y. (November 8, 2018). "A Performance Study of Controlled Impact Timing on Harmonics Reduction in Operational Modal Testing." ASME. J. Dyn. Sys., Meas., Control. March 2019; 141(3): 034501. https://doi.org/10.1115/1.4041609
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