Experimental study of the free vibration of clamped trapezoidal plates

1983 ◽  
Vol 88 (4) ◽  
pp. 523-534 ◽  
Author(s):  
K. Maruyama ◽  
O. Ichinomiya ◽  
Y. Narita
Keyword(s):  
Experimental Study ◽  
Free Vibration

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

2012 ◽  
Vol 12 (02) ◽  
pp. 377-394 ◽  
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.

Analytical and Experimental Study of Free Vibration Response of Soft-core Sandwich Beams

2004 ◽  
Vol 6 (3) ◽  
pp. 239-261 ◽  
Author(s):  
Vladimir S. Sokolinsky ◽  
Hubertus F. Von Bremen ◽  
J. André Lavoie ◽  
Steven R. Nutt
Keyword(s):  
Experimental Study ◽  
Free Vibration ◽  
Vibration Response ◽  
Soft Core ◽  
Sandwich Beams ◽  
Free Vibration Response

Experimental Study on the Vertical Vibration of Symmetrical Double Spring-Mass System

2015 ◽  
Vol 778 ◽  
pp. 24-27
Author(s):  
Yan Huang ◽  
Song Lin He
Keyword(s):  
Experimental Study ◽  
Free Vibration ◽  
Experimental Method ◽  
Relative Elongation ◽  
Vertical Direction ◽  
Vertical Vibration ◽  
Mass System ◽  
Mass Coefficient ◽  
Equivalent Mass

The free vibration along with the vertical direction of the symmetric double spring –mass system has been studied with experimental method. It is discovered that when the distance between two suspending points is not zero, the vibration of symmetrical double spring mass system along the vertical direction is nonlinear. The period of the system increases with the increase of the amplitude and distance of suspending points. The equivalent mass coefficient of the system vibrating nonlinearly is greater than that of the system vibrating harmonically and is related to inclination degree and relative elongation of the spring.

An Experimental Study of Bi-Directional Structure Vibration Suppression Using LPC Impact Dampers

2016 ◽  
Author(s):  
Mohamed Gharib ◽  
Mansour Karkoub
Keyword(s):  
Experimental Study ◽  
Free Vibration ◽  
Vibration Suppression ◽  
Free Vibrations ◽  
Offshore Platforms ◽  
3D Structures ◽  
High Rise ◽  
Particle Chain ◽  
Large Structures ◽  
Free Vibration Response

Vibration control of large structures has been the focus of a lot of research in recent years. Some of these structures include high rise buildings, offshore platforms, and bridges. In this article, we present the results of an experimental investigation of the usage of linear impact dampers in the control of the elasto-dynamic vibrations of 3D structures. Linear Particle Chain Impact Dampers (LPCIDs) are the off-spring of the commonly used conventional (single unit) impact damper. The free vibration response of a 3D symmetric frame subjected to a bidirectional initial condition is measured and analyzed. The objective is to examine the efficacy of the LPCID in attenuating the free vibrations of 3D frame structures. The settling times and amplitudes of vibration of the structure, with and without the LPCIDs, under free vibration conditions are measured and analyzed to study the efficacy of the dampers. The experimental study showed that the LPCID can be more effective in reducing the structure’s vibration when placed in specific orientations on the structure. Therefore, it can by concluded from the experiments’ outcomes that LPCIDs may be used to effectively attenuate the free vibrations of 3D structures.

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