Article
Mathematics, Applied
Yunfei Liu, Zhaoye Qin, Fulei Chu
Summary: This article presents a coupled nonlinear modeling approach to investigate the nonlinear forced vibrations in composite cylindrical shells. By numerical simulations, the effects of external temperature change, magnetic potential, electric potential, and excitation amplitude on vibration response were evaluated.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2022)
Article
Engineering, Mechanical
Yunfei Liu, Zhaoye Qin, Fulei Chu
Summary: This paper presents a new solution approach to address the nonlinear forced vibrations of functionally graded piezoelectric shells in multi-physics fields, considering the effects of micro-voids. By utilizing Hamilton's principle and the Donnell nonlinear shallow shell theory, motion equations are derived, and a novel method combining multi-mode Galerkin scheme and Pseudo-arclength continuation method is employed to solve the nonlinear multiple internal resonances and bifurcations of the systems with multiple degrees of freedom.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Engineering, Mechanical
Yunfei Liu, Zhaoye Qin, Fulei Chu
Summary: This paper establishes a nonlinear coupled mechanical model to analyze the nonlinear forced vibrations of rotating shells subjected to multi-harmonic excitations in a thermal environment. The effects of main factors on the nonlinear dynamic response of rotating shells are evaluated through numerical simulations and result verification.
NONLINEAR DYNAMICS
(2022)
Article
Mathematics, Applied
Youheng Dong, Haiyan Hu, Lifeng Wang, Xiaochen Mao
Summary: This paper investigates the nonlinear coupled multi-mode vibrations of thin-walled and moderately thick cylindrical shells based on nonlinear shell theory and shear deformation theory. Iteration procedure is used to solve the high-dimensional differential equations with quadratic and cubic nonlinearities, and the influence of irregular modes on coupled multi-mode vibrations is analyzed.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2024)
Article
Acoustics
Amit Yadav, Marco Amabili, Sarat Kumar Panda, Tanish Dey, Rajesh Kumar
Summary: This study presents a geometrically nonlinear forced vibration analysis of circular cylindrical sandwich shells with open/closed cellular core using higher-order thickness and shear deformation theory. It examines the effects of porosity coefficient, porosity distribution, core-to-face ratio, and volume fraction of CNTs in the face-sheets on the frequency-amplitude response. Extensive numerical studies are carried out to analyze these effects.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Mathematics, Applied
Yunfei Liu, Jun Wang, Jiaxin Hu, Zhaoye Qin, Fulei Chu
Summary: This paper studies the multiple internal resonances of composite cylindrical shells induced by rotation and the effect of temperature field variations on the system response. The equilibrium equations of the system are obtained using the Hamilton principle and the modified Donnell nonlinear shell theory, and then transformed into ordinary differential equations (ODEs) using the multi-mode Galerkin technique. The numerical results are obtained using the pseudo-arclength continuation method, which can identify the regions of instability. The study finds that the interaction between backward and forward wave modes causes multiple internal resonances, and the nonlinear amplitude-frequency response curves vary under different temperature fields.
APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION
(2022)
Article
Engineering, Mechanical
Bocheng Dong, Hui Li, Xiangping Wang, Wei Sun, Zhong Luo, Hui Ma, Zhaoye Qin, Qingkai Han
Summary: This paper investigates the nonlinear forced vibration characteristics of hybrid fiber/graphene nanoplatelets/polymer composite sandwich cylindrical shells with hexagon honeycomb core in a hygrothermal environment. An analytical model is proposed to determine the material parameters and equations for the nonlinear dynamic responses of the structure. The results obtained by the proposed model are compared to literature to validate its effectiveness. Some key conclusions regarding reducing the nonlinear resonance amplitude and resonance region are summarized.
NONLINEAR DYNAMICS
(2022)
Article
Mechanics
Hadj Youzera, Mahmoud Mohamed Selim Saleh, Mofareh Hassan Ghazwani, Sid Ahmed Meftah, Abdelouahed Tounsi, Thanh Cuong-Le
Summary: In this article, an analytical model is proposed to analyze the damping and frequency curves of the three layered sandwich beams composed of FGM faces and viscoelastic core layers. The model uses higher order zig-zag theories and higher order shear deformation theory (HSDT) to develop a kinematical model. The frequency response curves and nonlinear loss factors are obtained through analytical solutions derived from the harmonic balance technique and Galerkin's method. The study examines the effects of geometric and material parameters on the damping and frequency response curves of the sandwich beams using the proposed model.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Mathematics, Applied
Konstantin Avramov
Summary: The study focused on the free nonlinear oscillations of a cantilever cylindrical shell. Different theories and techniques were used to obtain the mathematical model of the structural vibrations, and analyses were conducted accordingly.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2021)
Article
Mathematics, Applied
M. Karimiasl, A. Alibeigloo
Summary: This study investigates the nonlinear vibration of a sandwich panel composed of functionally graded material (FGM) skins and double U auxetic core under heat conduction. Nonlinear equations are derived using Hamilton's principles and von Karman's nonlinear theory. The linear and nonlinear equations of motion are solved using the differential quadrature method (DQM) and homotopy perturbation technique respectively. The research findings demonstrate the significant effects of core thickness ratio, inclined angle, and thickness to inclined length ratio on the nonlinear frequency response of the sandwich panel. The results of this study can contribute to the development of different aircraft components.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2023)
Article
Thermodynamics
Ngoc-Tu Do, Pham Binh Le, Trung Thanh Tran, Quoc Hoa Pham
Summary: The main goal of this paper is to analyze the nonlinear transient behavior of FGSS shells subjected to blast loading in a thermal environment using the MITC4 based on FSDT. The proposed method provides results that are in good agreement with those in existing literature, and a thorough investigation into the nonlinear transient behavior of FGSS shells is conducted.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Mathematics, Applied
H. Tung, L. T. N. Trang
Summary: The nonlinear stability of sandwich cylindrical shells composed of porous FGM and CNTRC layers subjected to uniform temperature rise was investigated. It was found that sandwich shell model with a CNTRC core layer and relatively thin porous FGM face sheets has the best capacity of thermal load carrying. Porosities in the FGM were also shown to have beneficial effects on the nonlinear stability under thermal load, suggesting an optimal efficiency for advanced sandwich structures through a combination of the advantages of FGM and CNTRC.
APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION
(2021)
Article
Acoustics
Thi Phuong Nguyen, Trung Nguyen-Thoi, Duy Kien Tran, Duc Tuan Ho, Hoai Nam Vu
Summary: This article proposes a semianalytical approach for the nonlinear free and forced asymmetric vibration of corrugated sandwich functionally graded cylindrical shells containing fluid under harmonic radial load. The numerical investigations for the nonlinear dynamic response of cylindrical shells are obtained by using the fourth-order Runge-Kutta method. Numerical results show the very large effects of corrugation and fluid on the natural frequency and nonlinear vibration behavior of shells.
JOURNAL OF VIBRATION AND CONTROL
(2021)
Article
Mathematics, Interdisciplinary Applications
J. Zhang, W. Zhang, Y. F. Zhang
Summary: This paper investigates the resonant responses of a hyperelastic cylindrical shell with initial geometric imperfections by considering both geometric and material nonlinearities. The governing equations of motion are derived using Donnell's theory, hyperelastic constitutive relations, and Lagrange equation. Perturbation analysis is conducted under the 2:1 internal resonance condition using the multiple scale method. The numerical results show that the presence of geometric imperfections increases the linear frequencies of the hyperelastic cylindrical shell and the amplitude-frequency response curves exhibit double-jumping phenomena. The imperfection amplitudes, imperfection forms, and structure parameters significantly influence the resonant peak evolutions and the vibrations can transition from periodic to chaotic with changes in parameters.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Mathematics, Applied
Yunfei Liu, Zhaoye Qin, Fulei Chu
Summary: This article investigates the nonlinear dynamic responses of sandwich functionally graded porous cylindrical shells embedded in elastic media. It derives partial differential equations and uses the Galerkin method to obtain an approximate analytical solution, evaluating the effects of various system parameters on the shells.
APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION
(2021)
Article
Engineering, Mechanical
Jun Wang, Yunfei Liu, Zhaoye Qin, Liang Ma, Fulei Chu
Summary: Magnetorheological dampers (MRDs) are effective in vibration control in rotor systems, but they have limitations in dealing with nonlinear behaviors under large eccentricity and controlling the direction of damping force. To address these issues, this paper proposes an integral magnetorheological damper (IMRD) that allows adjustable magnitude and direction of oil film force. The IMRD model is implemented in a flexible rotor system, and the results show that IMRD can provide pure damping with adjustable stiffness and reduce nonlinearity compared to traditional MRDs.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Aerospace
Jun Wang, Yunfei Liu, Zhaoye Qin, Liang Ma, Fulei Chu
Summary: Magnetorheological (MR) dampers have excellent performance in reducing rotor vibration, but their high nonlinearity can lead to nonsynchronous response, resulting in fatigue and instability of rotors. This study focuses on the nonlinear characteristics of MR dampers mounted on flexible rotors. A hybrid numerical method is proposed to solve the nonlinear motion equations of the MR damper-rotor system. Experimental studies are conducted to evaluate the effects of different system parameters on the nonlinear dynamic behaviors of the MR damper-rotor system. The results show that suitable excitation current and oil supply pressure can effectively alleviate the level of nonlinearity.
CHINESE JOURNAL OF AERONAUTICS
(2023)
Article
Materials Science, Composites
Jigang Feng, Babak Safaei, Zhaoye Qin, Fulei Chu
Summary: This study designs and prepares nature-inspired sandwich composites for vibration suppression, which exhibit improved damping properties and surface friction force compared to conventional blended composites. Dynamic mechanical analysis and vibration test results confirm the superior damping properties of sandwich composites. Polydopamine modification of reduced graphene oxide (rGO) enhances the damping capability, providing an effective strategy for vibration energy dissipation and damping enhancement.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Runze Zhu, Yunfei Liu, Navya Bojja, Zhaoye Qin, Fulei Chu
Summary: This study proposes a unified modeling approach for rotating thin disks with ABH indentations. Finite element analysis is conducted to validate the proposed model. It is found that ABHs are capable of realizing vibration reduction for rotating structures, where the effectiveness is influenced by rotating speeds and excitation types.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Mechanics
Yunfei Liu, Zhaoye Qin, Fulei Chu
Summary: This study aims to improve the impact protection performance of composite structures by combining a honeycomb core with negative Poisson's ratio and graphene platelets reinforced (GPR) face sheets. The nonlinear repeated low-velocity impact responses of auxetic honeycomb composite plates are investigated, and effective material properties are obtained using the proposed modified Gibson function and Halpin-Tsai model. Nonlinear equations of motion are derived, and the time-varying contact force is defined using the modified nonlinear Hertz contact theory. The proposed methods are verified through finite element simulation and experiment.
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2023)
Article
Engineering, Environmental
Jigang Feng, Babak Safaei, Zhaoye Qin, Fulei Chu, Fabrizio Scarpa
Summary: Graphene coating on the skeleton of porous material significantly improves the mechanical properties, vibration damping performance, and sound absorption capability. The enhancement has been verified through dynamic mechanical analysis and vibration tests, and the coating exhibits reliability in harsh environments. Additionally, the flow resistance and sound absorption ability of the material are also improved by the coating, resulting in a significant increase in the noise reduction coefficient.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Mechanics
Wenliang Gao, Jiaxin Hu, Zhaoye Qin, Fulei Chu
Summary: This research presents a novel perforated metamaterial plate with acoustic black holes (ABHs) interconnected by piezoelectric studs for flexural wave manipulation. It derives the governing equations of the metamaterial plate using the differential quadrature element method and the first-order shear deformation plate theory. The proposed model is validated by comparing with finite element simulation results, and the wave propagation characteristics are obtained. The results show that the introduction of piezoelectric patches in the studs brings wider complete bandgaps (BGs) and stronger collimation effect at lower frequencies.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Mechanical
Jun Wang, Xuening Zhang, Yunfei Liu, Zhaoye Qin, Liang Ma, Fulei Chu
Summary: A new method of oil-film zoning control is proposed to extend rotor vibration reduction to the high-frequency range, addressing the unsatisfactory performance of damping support structures. A novel integral magnetorheological damper (IMRD) is used to achieve excellent vari-stiffness and vari-damping effects through oil-film zoning control, effectively reducing vibration in the resonance and high-frequency ranges.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Mechanical
Runze Zhu, Liufeng Zhang, Qinkai Han, Zhaoye Qin, Fulei Chu
Summary: In this study, a universal model is proposed and experiments are conducted to investigate the influence of constrained layer damping (CLD) on a rotating cylindrical shell and an annular disk. The proposed approach considers the rotating effects and formulates the equations of motion using the Rayleigh-Ritz method. The results are validated through comparison with numerical and experimental results, and the effects of the CLD patch location, thickness ratio, and coupling stiffness on the dynamic characteristics of the system are discussed.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Polymer Science
Jigang Feng, Babak Safaei, Zhaoye Qin, Fulei Chu
Summary: In nature, objects with rougher surfaces generally have higher friction coefficients, resulting in increased friction with contacting objects. The higher surface roughness of nanofillers dispersed in a matrix can enhance the energy dissipation capacity of composites. Comparative studies on composites reinforced with two types of graphene, reduced graphene oxide (rGO) and graphene oxide (GO), were conducted to assess factors including surface roughness, friction, dispersion, and specific surface area. The results showed that adding rGO/GO significantly increased the damping ratios of the composites. The research sheds light on the selection of graphene with high damping enhancement capabilities.
Article
Chemistry, Physical
Kaikai Qiao, Guoquan Liu, Xinpeng Xie, Yunfei Liu, Wenfeng Jiang, Fei Li, Lei Shi
Summary: This paper describes an acceptorless dehydrogenation process of N-heterocycles using a photoelectrochemical method under simulated sunlight irradiation at room temperature. Various N-heterocyclic compounds were effectively dehydrogenated into the corresponding products with high yields (up to 97%), accompanied by simultaneous hydrogen evolution in a PEC cell comprising a mesoporous BiVO4 photoanode and Pt electrode.
Article
Engineering, Civil
Yunfei Liu, Zhaoye Qin, Fulei Chu
Summary: This paper investigates the nonlinear vibrations of auxetic honeycomb composite plates and evaluates the impact of important parameters on the vibration characteristics. The nonlinear response curves are determined using the proposed modified Gibson function and multiple scale method.
THIN-WALLED STRUCTURES
(2023)
