Technical Brief

Investigation of Impact Profile and Isolation Effect in Automated Impact Device Design and Control for Operational Modal Analysis

[+] Author and Article Information
Z. C. Ong

Department of Mechanical Engineering,
Faculty of Engineering,
University of Malaya,
Kuala Lumpur 50603, Malaysia
e-mails: zhichao83@gmail.com;

C. C. Lee

Department of Mechanical Engineering,
Faculty of Engineering,
University of Malaya,
Kuala Lumpur 50603, Malaysia
e-mail: maxleecc@siswa.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 December 25, 2014; final manuscript received April 22, 2015; published online June 24, 2015. Assoc. Editor: Dumitru I. Caruntu.

J. Dyn. Sys., Meas., Control 137(9), 094504 (Sep 01, 2015) (5 pages) Paper No: DS-14-1550; doi: 10.1115/1.4030526 History: Received December 25, 2014; Revised April 22, 2015; Online June 24, 2015

A novel modal analysis technique called impact-synchronous modal analysis (ISMA) was introduced in previous research. With the utilization of impact-synchronous time averaging (ISTA), this modal analysis can be performed in presence of ambient forces whereas the conventional analysis method requires machines to be totally shut down. However, lack of information of phase angles with respect to impact in ISMA has caused it to be labor-intensive and time-consuming. An automated impact device (AID) is introduced in this study in the effort to replace the manually operated impact hammer and prepare it to be used in the current practice of ISMA on the purpose of enhancing its effectiveness and practicability. Impact profile and isolation effect are noted to be the contributing parameters in this study. This paper devoted on calibrating and controlling of the AID which gives the desired impact profiles as compared to the manual impact hammer. The AID is found effective in the determination of dynamic characteristics when the device is isolated from the boundary condition of the test structure.

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Grahic Jump Location
Fig. 1

Equipment setup with test rig

Grahic Jump Location
Fig. 2

Consistent impact interval and level by AID

Grahic Jump Location
Fig. 3

Impact contact time comparison (a) benchmarked manual impact hammer and (b) AID

Grahic Jump Location
Fig. 4

Overlaid frequency response function by (a) manual impact hammer (set 1), (b) AID without isolation (set 2), and (c) AID with isolation (set 3)

Grahic Jump Location
Fig. 5

Comparison of percentage difference of natural frequency



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