Wave transmission across laminated composite plate in the subsonic flow Investigating Two-variable Refined Plate Theory

Talebitooti, Roohollah; Johari, Vahid; Zarastvand, M.R.

doi:10.1590/1679-78254352

Cited by 31 publications

(11 citation statements)

References 30 publications

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“…Offshore wind turbines are, however, subjected to Environmental and Operational Conditions (EOCs) that affect their dynamic properties. Changes in frequencies due to changing EOCs was found to sometimes exceed those caused by actual damage [4,5].…”

Section: Introductionmentioning

confidence: 96%

The effect of marine growth and damage severity on the modal parameters of offshore wind turbine supporting structures: an experimental study

Jahjouh¹

2020

J. vibroeng.

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This contribution investigates the effect of marine growth and damage severity on the modal parameters of a scaled experimental model of a monopile used in supporting offshore wind turbines. A quick glimpse of the literature review reveals that this topic has not been well investigated as the majority of previous research focuses on the effect of marine growth on the hydrodynamic loads transferred to the test structure, with little focus on its effect on the modal parameters of a structure. Nevertheless, from a monitoring standpoint, it is important to differentiate between the effect of marine growth and damage on the modal parameters, especially when these parameters are used as damage indicators, further improving existing structural health monitoring techniques in determining if the changes observed in modal parameters are caused by actual damage rather than the growth of marine organisms with time. The results provided in this contribution provide differences between the effect of marine growth and damage, which is recommended to be included in current monitoring techniques. Furthermore, a recommendation to investigate the effect of damage on damping and, possibly, the potential of using changes in damping characteristics as damage indicators is also made.

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Section: Introductionmentioning

confidence: 96%

The effect of marine growth and damage severity on the modal parameters of offshore wind turbine supporting structures: an experimental study

Jahjouh¹

2020

J. vibroeng.

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“…Liu and He (2016) deduced an algorithm for calculating the STL of cylindrical sandwich shells lined with poroelastic materials and an air gap using Love’s and Biot’s theory. Next, Talebitooti et al (2016, 2017a, 2017b, 2018a, 2018b, 2019a, 2019b, 2019c, and 2019d) also performed a large amount of research related to the STL of multilayer cylindrical shells and plates with different theories, including the first- and third-order shear deformation theory, nondominated sorting genetic algorithm, two-variable refined plate theory, shear deformation shallow shell theory, and hyperbolic shear deformation theory. And Ghassabi et al (2019a, 2019b) studied sound performance of doubly curved thick structure employing three-dimensional theory.…”

Section: Introductionmentioning

confidence: 99%

An improved approach for normal-incidence sound transmission loss measurement using a four-microphone impedance tube

Chen

et al. 2020

Journal of Vibration and Control

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The main aim of this study is to introduce an improved method for determining the sound properties of acoustic materials which is more precise than the common wavefield decomposition method and simpler than the common transfer matrix method. In the first part of the article, a group of formulae for calculating sound transmission loss is represented by combining the wavefield decomposition and transfer matrix methods. Subsequently, a formula for calculating sound absorption coefficients is derived from these formulae by definition. Furthermore, the present formulae are validated by comparing the experimental results achieved with the present formulae and those results obtained by other methods recorded in published articles. Eventually, it is demonstrated that the method can accurately measure the sound insulation performance of materials and the sound absorption properties of limp and lightweight materials.

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“…Liu [47] calculated STL of the poroelastic triple-panel structures treated with porous material. However, two variable refined plate theory was investigated to acoustic analyze of a plate in the external flow [48]. Afterwards, the effect of hyperbolic shear deformation theory on the STL of the infinite FG panels was inspected [49].…”

Section: Introductionmentioning

confidence: 99%

Multi-objective optimization approach on diffuse sound transmission through poroelastic composite sandwich structure

Talebitooti

Zarastvand

Darvishgohari

2019

Jnl of Sandwich Structures & Materials

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Multi-objective vibroacoustic optimization of the double-walled doubly curved composite shells having poroelastic lining in its core in a diffuse field is performed based on Non-dominated sorting Genetic Algorithm-II. To present an analytical model on the basis of multi-objective optimization, the summation of sound transmission loss and transverse displacement along with weight of the structure are considered as two cost functions, which should be optimized in a diffuse field. In fact, the significant achievement of this work is to design an optimization algorithm to improve vibroacoustic fitness and weight of the sandwich doubly curved shells. In the first part of the paper, a general formulation is prepared to analyze the dynamic of the poroelastic composite sandwich structures. Likewise, some validation configurations are presented to confirm the accuracy of the current formulation. Consequently, an optimization algorithm is provided on the basis of considering some appropriate design variables including material and porous types as well as stacking sequences. In this regard, a batch of 19 benchmarks of porous core is investigated. Furthermore, a configuration of optimized points in the Pareto front is plotted in which the simultaneous effects of optimizing the weight and vibroacoustic fitness can be observed. As a result, a new approach is made through optimization of the transverse displacement of the structure as a function of various incidence and azimuth angles in three dimensional configurations with respect to different frequencies.

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Wave transmission across laminated composite plate in the subsonic flow Investigating Two-variable Refined Plate Theory

Cited by 31 publications

References 30 publications

The effect of marine growth and damage severity on the modal parameters of offshore wind turbine supporting structures: an experimental study

The effect of marine growth and damage severity on the modal parameters of offshore wind turbine supporting structures: an experimental study

An improved approach for normal-incidence sound transmission loss measurement using a four-microphone impedance tube

Multi-objective optimization approach on diffuse sound transmission through poroelastic composite sandwich structure

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