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http://dx.doi.org/10.5139/JKSAS.2018.46.8.621

Study on Modal Test Method for Vibration Characteristics of the Cylindrical Structure Filled with Liquid  

Kim, Gen-Sang (Department of Aerospace Engineering, Chungnam National University)
Kim, Mun-Guk (Department of Aerospace Engineering, Chungnam National University)
Kim, In-Gul (Department of Aerospace Engineering, Chungnam National University)
Park, Jae-Sang (Department of Aerospace Engineering, Chungnam National University)
Park, Soon-Hong (Launcher Structures and Materials Team, Korea Aerospace Research Institute)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.46, no.8, 2018 , pp. 621-630 More about this Journal
Abstract
In the case of launch vehicles using liquid fuel, natural frequency changes due to fuel consumption after launch, and a modal test is essential to investigate its effect. However, when relying on modal test to characterize the free vibration characteristics, the testing time is excessively increased and accuracy is reduced. Therefore, this paper suggests a modal test method with finite element analysis to overcome these drawbacks. A cylindrical structure filled with liquid are considered as a study model, and modal tests and finite element analyses are performed. The modal tests are conducted by an impulsive method using an impact hammer and accelerometers. Through the comparison of the modal test and the finite element analysis results, the validity of the proposed modal test method is verified. In addition, the free vibration characteristics and the tendency for the cylindrical structure according to the liquid filled ratio were investigated.
Keywords
Natural Frequency; Mode Shape; Modal Test; Modal Analysis; Free Vibration;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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1 Miller, R. P., and Gerus, T. F., Experimental Lateral Bending Dynamics of the Atlas-Centaur-Surveyor Launch Vehicle, NASA TM X-1837, 1969.
2 Buherle, R. D., Templeton, J. D., Reaves, M. C., Horta, L. G., Gaspar, J. L., Bartolotta, P. A., Parks, R. A., and Lazor, D. R., "ARES I-X Launch Vehicle Modal Test Overview," Proceedings of the IMAC-XXVIII, Jacksonville, Florida, 2010.
3 Youn, S. H., Jang, Y. S., Park, S. H., and Yi, Y. M., "Modal Test of EM and Modal Analysis of FM for KSR-III," Journal of Korea Society for Aeronautical and Space Sciences, Vol. 32, No. 2, 2004, pp.95-102.   DOI
4 Leadbetter, S. A., Leonard, W., and Brock, E. J. Jr., Design and Fabrication Considerations for a 1/10-scale Replica Model of the Apollo/Saturn V, NASA TN D-4138, 1967.
5 Johannes, W., "The Virtual Mass Method," Virtual Mass Seminar, MSC Corporation, 2002.
6 Kim, G. S., Study on Free Vibration Characteristics of the Cylindrical Structure Filled with Liquid, MS Thesis, Department of Aerospace Engineering, Chungnam National University, 2017.
7 Peter, A., "Experimental Modal Analysis," Sound and Vibration Magazine, 2001.
8 Lee, S., and Lee, J. W., "Investigation of Error Factors from an Impact Hammer Test for Developing a Statistic Based Technique for Model Updating," Transactions of the Korean Society of Mechanical Engineers A, Vol. 40, No. 2, 2016, pp.185-198.   DOI
9 Watkins, J. D., and Clary, R. R., Vibrational Characteristics of Some Thin-walled Cylindrical and Conical Frustum Shells, NASA TN D-2729, 1965.
10 Jalali, H., and Parvizi, F., "Experimental and Numerical Investigation of Modal Properties for Liquid-Containing Structures," Journal of Mechanical Science and Technology, Vol. 26, No. 5, 2012, pp.1449-1454.   DOI