Parametric Instability of a Beam Due to Axial Excitations and to Boundary Conditions

Author:

Dufour R.1,Berlioz A.1

Affiliation:

1. Laboratoire de Me´canique des Structures, ESA CNRS UPR5006, INSA de Lyon, Baˆt, 113, 20, avenue Albert Einstein, 69621 Villeurbanne, France

Abstract

In this paper the stability of the lateral dynamic behavior of a pinned-pinned, clamped-pinned and clamped-clamped beam under axial periodic force or torque is studied. The time-varying parameter equations are derived using the Rayleigh-Ritz method. The stability analysis of the solution is based on Floquet’s theory and investigated in detail. The Rayleigh-Ritz results are compared to those of a finite element modal reduction. It is shown that the lateral instabilities of the beam depend on the forcing frequency, the type of excitation and the boundary conditions. Several experimental tests enable the validation of the numerical results.

Publisher

ASME International

Subject

General Engineering

Reference17 articles.

1. Berlioz A. , Der HagopianJ., DufourR., and DraouiE., 1996, “Dynamic Behavior of a Drill-String: Experimental Investigation of Lateral Instabilities,” ASME JOURNAL OF VIBRATION AND ACOUSTICS, Vol. 118, pp. 292–298.

2. Bolotin, V. V., 1964, The Dynamic Stability of Elastic Systems, Holden-Day, Inc.

3. Dunayevski, V. A., and Judnis, A., 1985, “Dynamic Stability of Drillstrings under Fluctuating Weight-On-Bit,” SPE 14329, 60th Annual Technical Conference and Exhibition of the Society of Petroleum, San Francisco.

4. Evan-Iwanowski, R. M., 1976, Resonance Oscillations in Mechanical Systems, Elsevier, New York.

5. Friedmann P. P. , 1990, “Numerical Methods for the Treatment of Periodic Systems with Applications to Structural Dynamics and Helicopter Rotor Dynamics,” Computer & Structures, Vol. 35, No. 4, pp. 329–347.

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