Free Vibration and Sound Radiation of Bistable Clamped-Clamped Beams: An Experimental Study

The exciting force’s accurate measurement of is crucial to the structure-born sound radiation. Forced vibration and sound radiation of the ribbed cylinder is examined in the anechoic room. An approach called added mass and damping method is proposed to calculate the elastic vibration and acoustic field of the cylinder. Results obtained from simulation are show to be in good agreement with the experimental data. Sound radiation induced by different input loading form is examined via simulation and experiment. And the equipollence of force and pressure acting on the base is validated.

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NUMERICAL AND EXPERIMENTAL STUDY ON FREE VIBRATION OF DELAMINATED WOVEN FIBER GLASS/EPOXY COMPOSITE PLATES

International Journal of Structural Stability and Dynamics ◽

10.1142/s0219455412500083 ◽

2012 ◽

Vol 12 (02) ◽

pp. 377-394 ◽

Cited By ~ 20

Author(s):

J. MOHANTY ◽

S. K. SAHU ◽

P. K. PARHI

Keyword(s):

Experimental Study ◽

Aspect Ratio ◽

Free Vibration ◽

Boundary Conditions ◽

Natural Frequencies ◽

Numerical Study ◽

Shear Deformation Theory ◽

Composite Plates ◽

Fiber Glass ◽

Number Of Layers

This paper presents a combined experimental and numerical study of free vibration of industry-driven woven fiber glass/epoxy (G/E) composite plates with delamination. Using the first-order shear deformation theory, an eight-noded two-dimensional quadratic isoparametric element was developed, which has five degrees of freedom per node. In the experimental study, the influence of various parameters such as the delamination size, boundary conditions, fiber orientations, number of layers, and aspect ratio on the natural frequencies of delaminated composite plates are investigated. Comparison of the numerical results with experimental ones shows good agreement. Fundamental natural frequencies are found to decrease with the increase in the delamination size and fiber orientation and increases with the increase in the number of layers and aspect ratio of delaminated composite plates. The natural frequency of the delaminated composite plate varies significantly for different boundary conditions.

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Free Vibration of Thin-Walled Open Section Beams With Unconstrained Damping Treatment

Journal of Applied Mechanics ◽

10.1115/1.3157561 ◽

1981 ◽

Vol 48 (1) ◽

pp. 169-173 ◽

Cited By ~ 7

Author(s):

S. Narayanan ◽

J. P. Verma ◽

A. K. Mallik

Keyword(s):

Free Vibration ◽

Cross Section ◽

Transverse Vibration ◽

Natural Frequencies ◽

Vibration Characteristics ◽

Numerical Results ◽

Simply Supported ◽

Clamped Beams ◽

Thin Walled ◽

Open Cross Section

Free-vibration characteristics of a thin-walled, open cross-section beam, with unconstrained damping layers at the flanges, are investigated. Both uncoupled transverse vibration and the coupled bending-torsion oscillations, of a beam of a top-hat section, are considered. Numerical results are presented for natural frequencies and modal loss factors of simply supported and clamped-clamped beams.

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