Free vibration response of smart sandwich plates with porous CNT-reinforced and piezoelectric layers

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.

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FREE VIBRATION RESPONSE OF LONG MULTI-SPAN BRIDGES ACCOUNTING FOR SOIL-STRUCTURE INTERACTION

10.7712/120121.8847.18976 ◽

2021 ◽

Author(s):

Pieter Reumers ◽

Geert Lombaert ◽

Geert Degrande

Keyword(s):

Free Vibration ◽

Soil Structure ◽

Vibration Response ◽

Soil Structure Interaction ◽

Structure Interaction ◽

Free Vibration Response

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Free vibration response: Single-degree-of-freedom system

Dynamics of Structures ◽

10.1201/b11772-12 ◽

2012 ◽

pp. 203-238

Keyword(s):

Free Vibration ◽

Vibration Response ◽

Degree Of Freedom ◽

Single Degree Of Freedom ◽

Single Degree ◽

Free Vibration Response

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Free Vibration of Sandwich Plates and Shells by Using Zig-Zag Function

Shock and Vibration ◽

10.1155/2009/573674 ◽

2009 ◽

Vol 16 (5) ◽

pp. 495-503 ◽

Cited By ~ 19

Author(s):

S. Brischetto ◽

E. Carrera ◽

L. Demasi

Keyword(s):

Free Vibration ◽

Free Vibration Analysis ◽

Sandwich Plates ◽

Vibration Modes ◽

Fundamental Vibration ◽

First Derivative ◽

The Core ◽

Sandwich Plates And Shells ◽

Plates And Shells ◽

Free Vibration Response

This paper analyses the free vibration response of sandwich curved and flat panels by introducing the zig-zag function (—1)kζk(ZZF) in the displacement models of classical and higher order two-dimensional shell theories. The main advantage of ZZF is the introduction of a discontinuity in the first derivative, zig-zag effect, of the displacements distribution with correspondence to the core/faces interfaces. Results including and discarding ZZF are compared. Several values of face-to-core stiffness ratio (FCSR) and geometrical plate/shell parameters have been analyzed. Both fundamental vibration modes and those corresponding to high wave numbers are considered in the analysis. It is concluded that: (1) ZZF is highly recommended in the free vibration analysis of sandwich plates and shells; (2) the use of ZZF makes the error almost independent by FCSR parameter; (3) ZZF is easy to implement and its use should be preferred with respect to other `more cumbersome' refined theories.

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