ANALISIS EKSPERIMENTAL GETARAN BANTALAN BOLA DENGAN MENGGUNAKAN FRF ORDE TINGGI
Abstract
This work is based on method developed by Storer, Lee and Tomlinson [1,2,3]. Storer [1] determined parameter of nonlinear system by curve fitting of higher order FRF that was obtained by measuring stimulus and response of nonlinear system in the frequency domain. While Lee [2] determined spatial model parameter i.e. mass, stiffness and damping constant based on higher order FRF that was obtained from measurement of excitation force amplitude in time domain and complex response in frequency domain. In this paper the two methods will be compared by conducting experiment on the ball bearing which shows nonlinear behavior [4,5]. The result shows the two methods have a significant difference. While the amplitude of excitation force affect the higher order Transfer Function and also the dynamical parameter of the system.
References
Storer DM dan Tomlinson GR, "Higher Order Frequency Response Functions and Their Relation to Practical Structures", 10th International Modal Analysis Conference, Florence. Italy, 1992.
Lee GM, "Estimation of Nonlinear System Parameters Using Higher Order Frequency Response Functions", Mechanical systems and Signal Processing, II(2), 219 - 228, 1997.
Tomlinson GR, et al. "A Simple Criterion for Establishing an Upper Limit to the Harmonic Excitation Level of the Duffing Oscillator Using the Volterra Series", Journal of Sound and Vibration 190(5),75l-762, 1996.
Lim TC dan Singh R, "Vibration Transmission Through Rolling Element Bearings, Part l : Bearing Stiffness Formulation" , Journal of Sound and Vibration, 139(2), 179 -199, 1990.
lskandar IS, Kaji Eksperimental dan Analisis Teoritik Respons Getaran Sistem Poros Rotor karena Massa tak Seimbang dan Cacat pada Bantalan, Thesis Magister, Teknik Mesin, ITB, 1997.
Schetzen M, The Volterra and Wiener Theories of Non-Linear Systems, John Wiley, New York, 1980.
Storer DM dan Tomlinson GR, "An Explanation of the Cause of the Distribution in the Transfer Function of A Duffing Oscillator Subject to Sine Excitation" , 10th International Modal Analysis Conference, Florence, Italy,l992.
Natke HG, et al, "A Brief Review On the identification of Nonlinear Mechanical Systems", 10th International Modal Analysis Conference. Florence, ltaly,l992.
Nayfeh A.H and Mook D.T, nonlinear oscillations, John,Wiley & Sons, New York, 1979.
Ewins DJ, Modal Testing : Theory and Practise, Research Studies Press, Letchworth, UK, 1984.
"f
