Article
Acoustics
Anita Orlowska, Adam Galezia, Andrzej Swiercz, Lukasz Jankowski
Summary: This study presents and tests a method for semi-active control of vibrations in sandwich-type beam structures by using a strategy called prestress accumulation release. The method involves making short time, impulsive and localized changes in actuator properties to reduce vibrations. The effectiveness of the approach was demonstrated through numerical experiments, showing high potential for semi-active damping of vibrations in sandwich-type structures.
JOURNAL OF VIBRATION AND CONTROL
(2021)
Article
Engineering, Marine
Korosh Khorshidi, Babak Soltannia, Mahdi Karimi, Ali Ghorbani
Summary: The current study investigates the free vibration analysis of a sandwich plate in contact with quiescent fluid. The structure consists of an electro-rheological (ER) fluid core and two laminated composite skins. The fluid, which is ideal, interacts partially with the plate, and the fluid potential velocity is derived satisfying the continuity equation. The developed model focuses on the nonlinear analysis of an ER sandwich panel coupled to an ideal fluid, and the obtained results can guide the future design of composite ER panels.
Article
Mechanics
M. H. Gholamzadeh Babaki, M. Shakouri
Summary: This article presents the free and forced vibration of a sandwich plate with functionally graded face layers and electrorheological fluid core. The natural frequencies and loss factors are obtained by solving the complex eigenvalue problem, and the effects of electric field, geometric aspect ratio, functionally graded component ratios, and core layer thickness on the dynamic behavior of the sandwich plate are studied.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2021)
Article
Mechanics
Y. S. Gao, S. Q. Zhang, G. Z. Zhao, R. Schmidt
Summary: A finite element formulation was developed for sandwich smart structures with partially smart constrained layer damping treatment, based on the Reissner-Mindlin theory. The FE model was validated through frequency and loss factor analysis, with parameters such as coverage percentage, layer thickness, and shear modulus studied for their effects on damping characteristics.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Civil
Z. Q. Wang, S. W. Yang, Y. X. Hao, W. Zhang, W. S. Ma, X. D. Zhang
Summary: This paper presents the modeling and free vibration analysis of a variable stiffness system consisting of a truncated sandwich conical shell made of porous aluminum foam core with variable thickness and carbon fiber face sheets under simply supported boundary condition. Nonlinear dynamic equations are derived based on first-order shear deformation theory and Hamilton's principle, considering the effect of thermal environment, and the natural frequencies of the system are obtained using the Galerkin method. The influences of porosity distribution pattern, porosity coefficient, total number of layers, temperature increment, semi-vertex angle, exponent of thickness function, minimum radius-thickness, and length-thickness ratio of the core layer on the natural frequencies, modal and mode shapes are comprehensively studied through comparison and validation with existing literature results.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Engineering, Multidisciplinary
Guangbin Wang, Hui Li, Yao Yang, Zhou Qiao, Zeyu Zou, Dongxu Du, Dongming Liu, Xumin Guo, Haihong Wu
Summary: This paper investigates the nonlinear vibration characteristics of composite pyramidal truss sandwich cylindrical shell panels. Through experimental and theoretical analysis, the relationship between vibration phenomenon and vibration parameters is studied. A theoretical model is developed to predict the nonlinear vibration based on defined material and geometric parameters, and its accuracy is validated through tests. The effects of critical parameters on the vibration characteristics are evaluated, providing suggestions for improving the vibration suppression capability of such structures.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Acoustics
Han Meng, Xiuchang Huang, Yanyu Chen, Stephanos Theodossiades, Dimitrios Chronopoulos
Summary: This study investigates the effects of incorporating negative stiffness oscillators into continuous multilayered vibrating structures, comparing their performance against linear oscillators in a broadband sense.
Article
Mechanics
Axel Fink, Rolf Schatz
Summary: This paper presents an integrative approach for noise attenuation on aircraft structures, using an elastomeric layer interleaved within the primary structural arrangement. The acoustic performance of the damped panels is experimentally evaluated in terms of sound transmission loss.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Ceramics
Yi Chen, Weijian Sun, Haonan Zheng, Changhao Li, Bo Zhang, Baoxiang Wang, Chuncheng Hao
Summary: In this paper, a novel H2Ti2O5@MoS2@SiO2 ternary composite material with a unique core/shell structure was prepared by a combination of dual hydrothermal method and controlled hydrolysis method. The material exhibits active response characteristics and high electrical conductivity, as confirmed by electron microscopy showing a honeycomb structure and XRD analysis verifying the composition of the material.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Jiangchao Chen
Summary: A meshless collocation method based on radial basis functions (MC-RBF) is proposed in this study to analyze the vibrational response of a sandwich circular cylindrical nanopipe in supersonic airflow and conveying fluid flow. The governing equations are discretized using the MC-RBF method to obtain the natural frequencies, and the results are verified through COMSOL multi-physics software.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Mechanics
Hukum Chand Dewangan, Mukesh Thakur, S. S. K. Deepak, Subrata Kumar Panda
Summary: This study introduces two different geometrical nonlinear strain-displacement relationships for modeling laminated shell structures with cutouts and a higher-order displacement model. It highlights the necessity of Green-Lagrange's nonlinear strain in higher-order displacement kinematics. The predicted nonlinear solutions are validated through examples, demonstrating the effects of cutouts and multilayered structures.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Aerospace
Vikash Kumar, Subrata Kumar Panda, Madhuresh Dwivedi, S. R. Mahmoud, Mohammed Balubaid
Summary: The nonlinear finite element (FE) modeling approach is used to predict the modal responses of damaged layered shell structures. The damaged panel structure is mathematically constructed using a circular meshing approach. Delamination is introduced using the sublaminate approach. The accuracy of the predicted responses is verified through stability analysis and comparison with published data.
Article
Mechanics
Zahra Soltani, Seyed Ali Hosseini Kordkheili
Summary: This study aims to calculate interlaminar stress distribution in multilayered composite shell structures using a novel nonlinear layer-wise shell finite element formulation. The results are in good agreement with existing literature and simulations conducted with the commercial finite element software Ansys.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Vyacheslav N. Burlayenko, Tomasz Sadowski, Holm Altenbach
Summary: An efficient finite element model based on conventional shell elements in ABAQUS software was developed for free vibration analysis of FGM monolayer and sandwich flat panels. Different through-the-thickness material gradations were considered, and user-defined material subroutine UMAT was used to implement functionally graded properties. The study showed good agreement with existing literature, confirming accuracy at minimal computational costs.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Changhao Li, Yi Chen, Liyue Wang, Zishuo Wang, Yusheng Lin, Kesi Xiong, Baoxiang Wang, Chuncheng Hao
Summary: Electrorheological (ER) fluid is an intelligent material consisting of polarized micro- and/or nanoparticles dispersed into insulating oil. Recently, the incorporation of molybdenum disulfide (MoS2), a popular 2D material, has offered a new approach to develop high-performance ER materials. However, MoS2 ER material suffers from low polarization strength and high electrical conductivity. To overcome these limitations, a two-step method is used to prepare PANI and MoS2 hybrid composite nanoparticles with unique morphology. The optimized ratio of PANI to MoS2 is found to be 4:1, resulting in excellent material performance with shear stresses reaching 150 Pa. Overall, this material demonstrates great potential as an electrorheological material.
ADVANCED ENGINEERING MATERIALS
(2023)