scholarly journals Free vibration and inherent material damping characteristics of boron-FRP plate: influence of non-uniform uniaxial edge loads

2021 ◽  
Vol 12 ◽  
pp. 18
Author(s):  
Vijay Gunasekaran ◽  
Jeyaraj Pitchaimani ◽  
Lenin Babu Mailan Chinnapandi
Keyword(s):  
Free Vibration ◽  
Strain Energy ◽  
Analytical Investigation ◽  
Vibration Response ◽  
Buckling Load ◽  
Material Damping ◽  
Damping Characteristics ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Free Vibration Response

The current investigation presents the analytical investigation on free vibration and inherent material damping of boron-FRP plate, subjected to non-uniform uniaxial edge loads. Initially critical buckling load (Pcr) is obtained, then followed by free vibration response and inherent material damping values for corresponding modal indices of the FRP plate is calculated for different load fraction of non-uniform uniaxial edge loads. The buckling load and free vibration response are obtained by using strain energy method and Reddy's TSDT respectively. It is observed that the nature of load and aspect ratio influence the bucking, free vibration and inherent material damping behaviour of the fibre reinforced polymer plate significantly.

A Study on Structural System Identification and Damage Detection for Free Vibration Response Using the Wavelet Transform

2015 ◽  
Vol 752-753 ◽  
pp. 1029-1034
Author(s):  
Asnizah Sahekhaini ◽  
Pauziah Muhamad ◽  
Masayuki Kohiyama ◽  
Aminuddin Abu ◽  
Lee Kee Quen ◽  
...  
Keyword(s):  
Free Vibration ◽  
Damage Detection ◽  
Vibration Response ◽  
Structural System ◽  
Modal Parameter ◽  
Modal Parameter Identification ◽  
Complex Morlet Wavelet ◽  
Structural System Identification ◽  
Free Vibration Response ◽  
Energy Components

This paper presents a wavelet-based method of identification modal parameter and damage detection in a free vibration response. An algorithm for modal parameter identification and damage detection is purposed and complex Morlet wavelet is chosen as an analysis wavelet function. This paper only focuses on identification of natural frequencies of the structural system. The method utilizes both undamaged and damage experiment data of free vibration response of the truss structure system. Wavelet scalogram is utilizes for damage detection. The change of energy components for undamaged and damage structure is investigated from the plot of wavelet scalogram which corresponded to the detection of damage.

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

scholarly journals Investigation of Free Vibration Response of E-Glass/Epoxy Delaminated Composite Plates

2012 ◽  
Vol 21 (1) ◽  
pp. 096369351202100 ◽  
Author(s):  
Turan Ercopur ◽  
Binnur Goren Kiral
Keyword(s):  
Free Vibration ◽  
Natural Frequency ◽  
Epoxy Composite ◽  
Free Vibration Analysis ◽  
Composite Plates ◽  
Vibration Response ◽  
Mode Shapes ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Free Vibration Response

This paper deals with the finite element analysis of free vibration response of the delaminated composite plates. Free vibration analysis is performed by using ANSYS commercial software developing parametric input files. Natural frequency values and associated mode shapes of E-glass/epoxy composite delaminated plates are determined. Effects of delamination shape, dimension and location on the natural frequency and associated mode shapes are investigated and for the purpose of the observing the effect of the boundary conditions, cantilever and clamped-pinned delaminated composite plates are taken into consideration. Comparisons with the results in literature verify the validity of the developed models in this study. It is observed that the natural frequency decreases in the existence of the delamination and level of the decrease depends on the dimension, shape and location of the delamination.

Free vibration response of P-FGM and S-FGM sandwich shell panels: A comparison

2020 ◽  
Vol 28 ◽  
pp. 1701-1705
Author(s):  
Abhilash Karakoti ◽  
Shashank Pandey ◽  
Vishesh Ranjan Kar
Keyword(s):  
Free Vibration ◽  
Vibration Response ◽  
Sandwich Shell ◽  
Free Vibration Response

Damped Vibration Response at Different Speeds of Wire in Slurry Wiresaw Manufacturing Operations

2008 ◽  
Author(s):  
Chunhui Chung ◽  
Imin Kao
Keyword(s):  
Free Vibration ◽  
Surface Finish ◽  
Vibration Response ◽  
Wafer Surface ◽  
Carrier Fluid ◽  
Good Surface ◽  
Infinite Sets ◽  
Axially Moving ◽  
Two Parameters ◽  
Free Vibration Response

Wiresaw has become a standard slicing tool especially for large ingots in the wafer preparation industry since late 1990s. To meet the requirements of the surface finish and topology, it is critical to control the process parameters to render good surface finish and to minimize kerf loss. The vibration of moving wire in the wiresaw manufacturing operation affects the wafer surface finish and kerf loss; therefore, the study and analysis of vibration of moving wire become very important and relevant to this manufacturing process. Built on the previous research, the free vibration response of axially moving wire with damping is a combination of infinite sets of response solutions, with trigonometric functions due to end constraints. The apparent damping due to the increase of speed on the first several components of responses will be presented and discussed in this paper. The results also show that the increase in speed will excite components of response except the dominating one. Since the free vibration response is a combination of infinite sets of solutions, it is not possible for the system to be completely critically-damped or over-damped because of the existence of under-damped modes at higher order. Therefore, a damped index is introduced to help in understanding the behavior of such system. When the physical damping is increased (for example, by using a more viscous carrier fluid in slurry), all components are more damped accordingly. However, in addition to the physical damping, the apparent damping caused by the increase of wire speed will also damp out the response. These two parameters, physical damping and apparent damping, control the behavior of an axially moving wire. This is a new finding in vibration analysis of moving wire that, to our best knowledge, has not been reported in the previous literature.

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