Mohd Irman Ramli, Mohd. Zaki Nuawi, Shahrum Abdullah, Mohammad Rasidi Mohammad Rasani, Muhamad Arif Fadli Ahmad, Kho Ko Seng


This study is conducted to determine the modal parameters namely natural frequencies and mode shapes of aluminum 6061 (Al6061). The parameters are done by conducting a free dynamic vibration analysis. Modal analysis study was conducted by both simulation and experimental approaches. The simulation was conducted via ANSYS software while the experimental work was performed through impact hammer testing to determine the vibration parameter. Two sensors i.e. piezoelectric film and accelerometer were used. The result obtained were ya = 302.02x – 52.51 (accelerometer) and yp = 295.78x - 41.73 (piezofilm). ya (accelerometer) and yp (piezofilm) is linear equation of the data plotted according to the reading from mode shape versus natural frequency. The relation between natural frequency from accelerometer and piezofilm for the rectangular-shaped specimen was ya = 1.02yp – 9.90 and can be concluded that the regression ratio of 1.02 was approximately 1.0 which agreed with the status of piezoelectric film sensor that can be used as an alternative sensor for accelerometer. There was a good results agreement between simulation and experimental work outcome.


Modal parameters, natural frequency, mode shape, modal analysis, piezoelectric film, accelerometer

Full Text:



Bor-Tsuen Wang, Deng-Kai Cheng. 2011. Modal Analysis by Free Vibration Response Only for Discrete and Continuous Systems. Journal of Sound and Vibration. 330: 3913-3929.

Tadej Kranj, Janco Slavic, Miha Boltezar. 2013. The Mass Normalization of the Displacement and Strain Mode Shapes in a Strain Experimental Modal Analysis using the Mass-Change Strategy. Journal of Sound and Vibration. 332: 6968-6981.

Daniel J. Inman. 2013. Engineering Vibration. 4th. Edition. Prentice Hall, USA.

He, J., Fu, Z. F. 2001. Modal Analysis. Boston MA, Butterworth-Heinemann.

M.B. Wilkinson, M. Outram. 2009. Principles of Pressure Transducers, Resonance, Damping and Frequency Response. Anaesthesia & Intensive Care Medicine. 10(2): 102-105.

Guilherme Augusto Lopes da Silva, Rodrigo Nicoletti. 2017. Optimization of Natural Frequencies of a Slender Beam Shaped in a Linear Combination of its Mode Shapes. Journal of Sound and Vibration. 397: 92-107.

Chein-Shan Liu, Botong Li. 2017. An Upper Bound Theory to Approximate the Natural Frequencies and Parameters Identification of Composite Beams. Composite Structures. 171: 131-144.

Qiao Ni, Yangyang Luo, Mingwu Li, Hao Yan. 2017. Natural Frequency and Stability Analysis of a Pipe Conveying Fluid with Axially Moving Supports Immersed in Fluid. Journal of Sound and Vibration. 403: 173-189.

Mustapha Dahak, Noureddine Touat, Noureddine Benseddiq. 2017. On the Classification of Normalized Natural Frequencies for Damage Detection in Cantilever Beam. Journal of Sound and Vibration. 402: 70-84.

C. Saharat, W. Naoyuki. 2017. Experimental and Numerical Investigation on the Fundamental Natural Frequency of a Sandwich Panel including the Effect of Ambient Air Layers. Archives of Civil and Mechanical Engineering. 17: 658-668.

Benson H. Tongue. 2002. Principles of Vibration. 2nd. Edition. Oxford University Press.

William T. Thomson, Marie D. Dahleh. 1998. Theory of Vibration with Applications. 5th. Edition. Prentice Hall, USA.

N. Maia, J. Silva. 1997. Theoretical and Experimental Modal Analysis, Mechanical Engineering Research Studies: Engineering Dynamic Series. John Wiley & Sons Ltd.

Wei Gao. 2006. Interval Natural Frequency and Mode Shape Analysis for Truss Structures with Interval Parameters. Finite Element in Analysis and Design. 42(6): 471-477.

Wei Gao. 2007. Natural Frequency and Mode Shape Analysis of Structures with Uncertainty. Mechanical Systems and Signal Processing. 21(1): 24-39.

E. Hinton, M. Ozakca, N. V. R. Rao. 1995. Free Vibration Analysis and Shape Optimization of Variable Thickness Plate, Prismatic Folded Plates and Curved Shells, Part 2: Shape Optimization. Journal of Sound and Vibration. 181: 567-581.

A. Malekjafarian, E.J. Obrien. 2014. Identification of Bridge Mode Shapes using Short Time Frequency Domain Decomposition of the Responses Measured in a Passing Vehicle. Engineering Structures. 81: 386-397.

K. Ashwani, J. Himanshu, J. Rajat, P.P. Pravin. 2014. Free Vibration and Material Mechanical Properties Influence Based Frequency and Mode Shape Analysis of Transmission Gearbox Casing. Procedia Engineering. 97: 1097-1106.

Z.M. Fairuz, S.F. Sufian, M.Z. Abdullah, M. Zubair, M.S. Abdul Aziz. 2014. Effect of Piezoelectric Fan Mode Shape on the Heat Transfer Characteristics. International Communications in Heat and Mass Transfer. 52: 140-151.



  • There are currently no refbacks.

Copyright © 2012 Penerbit UTM Press, Universiti Teknologi Malaysia.
Disclaimer : This website has been updated to the best of our knowledge to be accurate. However, Universiti Teknologi Malaysia shall not be liable for any loss or damage caused by the usage of any information obtained from this web site.
Best viewed: Mozilla Firefox 4.0 & Google Chrome at 1024 × 768 resolution.