Article
Engineering, Mechanical
Junqing Wu, Ling Hong, Jun Jiang
Summary: This paper reviews the multi-harmonic balance method (MHBM) and variable-coefficient harmonic balance method (VCHBM) and reveals their relationship in solving quasi-periodic solutions. Additionally, improved formulations for the alternating Frequency-Time method (AFT) and phase condition for arc-length continuation method (ALC) are proposed to enhance the efficiency and robustness of VCHBM.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Mechanics
Haitao Liao
Summary: This paper proposes a continuation strategy that uses an optimization formulation to search for periodic solutions for bifurcation tracking. By integrating an optimization correction scheme with a prediction-correction strategy, the pseudo arclength equation is minimized with optimization constraints on the harmonic balance equations and bifurcation conditions. Stability and sensitivity analysis are conducted using the Floquet theory in the frequency domain.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Mechanics
Boxuan Chen, Yang Zeng, Hu Wang, Enying Li
Summary: An innovative approximate Bayesian computation (ABC) method is suggested in this study to identify composite parameters considering uncertainties, which can avoid the calculation of likelihood and make the inverse procedure simpler. The proposed framework integrates advanced techniques to reduce computational cost and increase efficiency and flexibility of the method.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Sary A. Malak, Ghassan G. Hachem
Summary: This paper explores the flexural response of thin marble panels strengthened with carbon and glass fiber-reinforced polymer laminates under out-of-plane loading. Experimental results show that the reinforced panels exhibit improved ultimate loads and deflections, enhancing durability and preventing brittle failures.
JOURNAL OF COMPOSITES FOR CONSTRUCTION
(2021)
Article
Multidisciplinary Sciences
Jong-Yun Yoon, Byeongil Kim
Summary: The main goal of this study is to suggest mathematical and numerical approaches to determine the complex dynamic behaviors regarding the bifurcation characteristics in nonlinear systems. The methods employed in this study successfully explain the basic ways to examine the bifurcation phenomena when the HBM is implemented.
SCIENTIFIC REPORTS
(2022)
Article
Acoustics
P. M. Anilkumar, S. Scheffler, A. Haldar, M. Brod, B. N. Rao, E. L. Jansen, R. Rolfes
Summary: In this research, a novel semi-analytical model is proposed to predict the non-linear dynamic characteristics of bistable variable stiffness (VS) laminates. The model effectively describes the dynamic behavior of laminates during snap-through process using Foppl von Karman kinematics and an efficient energy formulation. The accuracy of the model is verified through comparison with finite element analysis and experimental results. A parametric study is conducted to investigate the effect of different fiber alignments on the dynamic characteristics.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Computer Science, Interdisciplinary Applications
Gil -Yong Lee, Yong-Hwa Park
Summary: The objective of this study is to incorporate the proper generalized decomposition (PGD) into the harmonic balance method (HBM) for an efficient numerical continuation of nonlinear frequency response. The proposed method utilizes low-dimensional subspaces, employs the progressive Galerkin approach, and uses arc-length constraint to accurately track the proper path of the frequency response curve. Numerical studies demonstrate significant computational savings compared to HBM, while accurately reflecting the nonlinear behavior.
COMPUTERS & STRUCTURES
(2023)
Article
Chemistry, Multidisciplinary
Ke-Fan Xu, Ye-Wei Zhang, Mu-Qing Niu, Li-Qun Chen
Summary: This paper proposes a novel tuned mass damper with variable stiffness achieved through a PI controller and a mass block replaced by an inerter. The frequency responses are obtained through a harmonic balance method and numerical simulations, showing an improved vibration reduction performance with reduced additional weight. The maximum vibration reduction rate can reach 87.09% with the optimum negative stiffness ratio and inertance ratio.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Multidisciplinary
Zhaofei Xiao, Philip Harrison
Summary: The 'Fabric Steering' process introduces a novel low-cost manufacturing technique for producing variable stiffness panels. By manipulating biaxial fabrics, this method offers faster production rates and lower costs compared to Automated Fibre Placement. The computer aided engineering tool SteerFab can predict optimum fiber paths, mechanical behavior, and manufacturing instructions for the process.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Computer Science, Interdisciplinary Applications
Xin Wang, Yang Zeng, Hu Wang, Yong Cai, Enying Li, Guangyao Li
Summary: This paper proposes a data-driven approximate Bayesian computation (ABC) inverse method for quantifying the uncertainties of fiber path parameters in variable stiffness composite laminates (VSCL). The novelty lies in using an auto-encoder to extract feature vectors of the high-dimensional physical field and constructing the mapping between fiber path parameters and feature vectors using back-propagation neural network. Additionally, a hybrid adaptive nested sampling strategy is introduced by introducing differential operation to accelerate the sampling process of posterior distribution. Two engineering examples are used to verify the feasibility of the proposed method.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2022)
Article
Acoustics
Mehran Shahraeeni, Vladislav Sorokin, Brian Mace, Sinniah Ilanko
Summary: This study investigates the effects of nonlinear damping on the dynamics and performance of quasi-zero-stiffness vibration isolators. The results demonstrate that increasing nonlinear damping can effectively reduce peak transmissibility, but may increase transmissibility at intermediate to high frequencies as the base excitation level increases.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Engineering, Electrical & Electronic
Chuan Wang, Fangwei Xu, Qin Shu, Hongru Zheng, Zhiquan Ma, Wei Zhang, Liwu Gong
Summary: The existing noninvasive methods for estimating the utility harmonic impedance are based on the assumption that the impedance remains constant during the considered time interval. However, the utility harmonic impedance is variable due to various reasons such as short-circuit faults, grid operation changes, and capacitor switching. This paper proposes a novel method that estimates the variable utility harmonic impedance by minimizing the sum of weighted impedance variations and the weighted variance of background harmonic voltage variations. The effectiveness of the proposed method has been evaluated and verified through simulation and field cases.
IEEE TRANSACTIONS ON POWER DELIVERY
(2023)
Article
Mechanics
Min Sun, Kun Zhang, Yiji Chen, Zheng Zhang, Hao Chai, Guang Zhang, Shaofei Jiang
Summary: In this study, the influence of initial curing curvature on the negative stiffness and buffering characteristics of bistable laminates was analyzed. A geometric nonlinear finite element model was developed and verified through experimental comparison. The model was then used to investigate the effects of initial curing curvature on mechanical characteristics and buffering characteristics. The study found that adjusting the initial curing curvature can design the snap load and negative stiffness extremum, adjust the strain energy difference, and enhance the buffering range and efficiency of the laminate.
COMPOSITE STRUCTURES
(2023)
Article
Acoustics
Thibaut Vadcard, Alain Batailly, Fabrice Thouverez
Summary: This article assesses two numerical strategies based on the Harmonic Balance Method for characterizing the periodic response of a mechanical system with unilateral contact constraints. The study compares the Linear Complementarity Problem (LCP-HBM) and Dynamic Lagrangian Frequency Time (DLFT-HBM) methods and finds that the DLFT-HBM is asymptotically equivalent to the LCP-HBM. The study also highlights the non-physical high harmonics generated by oversampling time signals.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Metallurgy & Metallurgical Engineering
Tao Ji-xiao, Yi Sheng-hui, Deng Ya-jie, He Xiao-qiao
Summary: Variable stiffness composite laminates (VSCLs) are promising in aerospace engineering due to their designable material properties through changing fiber angles and stacking sequences. A numerical model based on control theory, classical laminate plate theory, and Piston theory is developed to control the thermal postbuckling and nonlinear panel flutter motions of VSCLs. The optimal location and shape of piezoelectric actuators for flutter suppression is determined through comparing the norms of feedback control gain.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2021)
Article
Mechanics
Hamed Akhavan, Pedro Ribeiro
COMPOSITE STRUCTURES
(2018)
Article
Mathematics, Applied
S. Stoykov
JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS
(2018)
Article
Materials Science, Multidisciplinary
Tomas R. C. Chuaqui, Carla M. C. Roque, Pedro Ribeiro
JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES
(2018)
Article
Engineering, Mechanical
Pedro Ribeiro, Tomas R. C. Chuaqui
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2019)
Article
Mathematics, Applied
Hamed Akhavan, Batool Soleimani Roody, Pedro Ribeiro, Ali Reza Fotuhi
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2019)
Article
Mechanics
Ana Margarida Antunes, Pedro Ribeiro, Jose Dias Rodrigues, Hamed Akhavan
COMPOSITE STRUCTURES
(2020)
Article
Engineering, Mechanical
S. Stoykov, E. Manoach
Summary: Early detection and localization of damages are crucial for optimal operation and efficient maintenance of structures. This study introduces two new approaches for damage localization of beams, based on comparison of time responses of intact and damaged beams.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Engineering, Mechanical
Eduardo Henrique Goncalves, Pedro Ribeiro
Summary: This study focused on investigating the vibration modes of single-walled and double-walled carbon nanotubes with an attached mass, aiming to develop a shell model for mass and cell detection applications. The research explored the impact of non-local theory on the accuracy of continuum CNT models and found that SWCNTs are more sensitive to attached concentrated masses compared to DWCNTs. The results indicate that the non-local shell theory can significantly improve the accuracy of CNT models for various applications.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2022)
Article
Materials Science, Multidisciplinary
Pedro Ribeiro, Ana Margarida Antunes, Hamed Akhavan, Jose Dias Rodrigues
Summary: This study investigates the effect of boundary conditions on the vibrations of variable stiffness composite laminates (VSCL) with curvilinear fibers. It proposes a more accurate model by representing boundaries as elastically restrained edges and explores the combined effect of fiber orientation and boundary stiffness on the geometrically non-linear forced vibrations of VSCL plates.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Mechanical
Hamed Akhavan, Pedro Ribeiro
Summary: This paper investigates the nonlinear flutter behavior of rectangular variable stiffness composite laminates subjected to a low supersonic airflow. The study employs nonlinear dynamics and a damage criterion to control the structural health of the composite materials, and examines the effect of fiber path angles on flutter behavior.
JOURNAL OF FLUIDS AND STRUCTURES
(2022)
Article
Mechanics
Duarte Cachulo, Hamed Akhavan, Pedro Ribeiro
Summary: This study investigates the aeroelastic stability of Variable Stiffness Composite Laminates (VSCL) cylindrical shells under supersonic airflow. The use of curvilinear reinforcement fibres is explored to increase the flutter speed. A linear mathematical model is developed for thin circular cylindrical VSCL shells. The finite element method is used to obtain the natural frequencies, mode shapes, and critical flutter conditions.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Mechanical
Tatiana Moreira Simoes, Pedro Ribeiro, Carlos Conceicao Antonio
Summary: The purpose of this work is to find the maximum fundamental frequency of vibration in variable stiffness composite laminates using an optimization procedure. The study shows that curvilinear fibers can lead to higher vibration frequencies compared to straight fibers, especially in in-plane vibrations. The proposed genetic algorithm and modeling methods are effective in determining optimal designs.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2023)
Article
Engineering, Aerospace
Hamed Akhavan, Pedro Ribeiro
Proceedings Paper
Engineering, Civil
Stanislav Stoykov, Emil Manoach, Maosen Cao
INTERNATIONAL CONFERENCE ON ENGINEERING VIBRATION (ICOEV 2017)
(2018)
Proceedings Paper
Engineering, Civil
Tomas R. C. Chuaqui, Pedro Ribeiro
INTERNATIONAL CONFERENCE ON ENGINEERING VIBRATION (ICOEV 2017)
(2018)
Article
Mechanics
Rawan Aqel, Patrick Severson, Rani Elhajjar
Summary: A novel core splice joint configuration for composite sandwich structures is studied and proposed to improve the strength and toughness. Experimental and numerical efforts show that this configuration can significantly increase the ultimate strength by 13% to 51% and the toughness by 2% to 35%.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xianheng Wang, Cong Chen, Jinsong Zhang, Xinming Qiu
Summary: In this paper, a new form-finding method based on spatial elastica model (FMSE) is proposed for elastic gridshells. The method integrates the deformations of elastic rods into the overall deformation of the gridshell, and solves a set of transcendental equations using the quasi-Newton method to ensure the deformation satisfies the given boundary conditions. The method is validated through experiments and expected to have potential applications in the investigations of elastic gridshells.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Hao Huang, Zitong Guo, Zhongde Shan, Zheng Sun, Jianhua Liu, Dong Wang, Wang Wang, Jiale Liu, Chenchen Tan
Summary: The conventional evaluation of 3D braided composites' mechanical properties through numerical and experimental methodologies hinders material application due to the expenses, time constraints, and laborious efforts involved. This study establishes a multi-scale finite element model and a surrogate model for predicting the elastic properties of 3D4D rotary braided composites with voids. By optimizing a neural network model, the results are validated and provide valuable insights into the microstructure and properties of these composites.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xinyu Li, Hao Zhang, Haiyang Yang, Junrong Luo, Zhongmin Xiao, Hongshuai Lei
Summary: Due to their excellent mechanical properties and design flexibility, fluted-core composite sandwich structures have gained significant attention in aerospace and rail transit applications. This study investigated the free-vibration characteristics and optimized design of composite fluted-core sandwich cylinders through theoretical models and experimental tests.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Chao Li, Chunzheng Duan, Xiaodong Tian, Chao Wang
Summary: A mechanistic model considering the bottom edge cutting effect and the anisotropic characteristics of the material is proposed in this paper to accurately predict cutting forces. The model was validated through a series of milling experiments and can be used to predict the cutting force of various parts of the cutter and any feed direction.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Camila Sanches Schimidt, Leopoldo Pisanelli Rodrigues de Oliveira, Carlos De Marqui Jr
Summary: This work investigates the vibro-acoustic performance of graded piezoelectric metamaterial plates. The study shows that piezoelectric metamaterial plates with reconfigurable properties can provide enhanced vibration and sound power attenuation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jun Ke, Li-jie Liu, Zhen-yu Wu, Zhong-ping Le, Luo Bao, Dong-wei Luo
Summary: Compared with other green natural fibers, ramie has higher mechanical properties and lower cost. In this study, ramie and glass fiber are made into composite circular tubes. The results show that the hybrid circular tube with ramie and glass fiber has improved torsional mechanical properties and reduced weight and cost. The failure mechanisms are affected by the loading direction and the content of each fiber.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Natalia Pingaro, Gabriele Milani
Summary: This paper proposes an enhanced analytical model for predicting the behavior of FRCM samples tested under standard tensile tests. The model takes into account the interaction between fibers and matrix through the interface, and assumes different material properties at different phases. By solving a second order linear differential equation, an analytical solution can be obtained. The model is validated with experimental data and shows good predictability.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jialiang Fan, Anastasios P. Vassilopoulos, Veronique Michaud
Summary: This article investigates the effects of voids, joint geometry, and test conditions on the fracture performance of thick adhesive Double Cantilever Beam (DCB) joints. It concludes that grooved DCB joints with low void content tested at low displacement rates showed stable crack propagation without significant crack path deviation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Auwalu I. Mohammed, Kaarthikeyan Raghupathy, Osvaldo De Victoria Garcia Baltazar, Lawson Onokpasah, Roger Carvalho, Anders Mogensen, Farzaneh Hassani, James Njuguna
Summary: This study investigates the performance of composite pressure vessels under damaged and undamaged conditions, providing insights into their reliability and residual strength capabilities. The results demonstrate that the damage profile and its effect on compressive strength are similar between damaged and non-damaged cylinders. When subjected to quasi-static compression, the polyethylene liner absorbs enough elastic strain energy to recover without plastic deformation. Additionally, quasi-static compression has little to no influence on the axial strength of the cylinders. The damage characterization reveals fiber breakage, delamination, local buckling, and brooming failure. This study has direct implications for the safety design tolerances, manufacturing strategies, and operational failure conditions of composite overwrapped pressure vessels (COPVs).
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Muhammad Irfan Shirazi, Samir Khatir, Djilali Boutchicha, Magd Abdel Wahab
Summary: Structural health monitoring is important to ensure the safety of components and structures. This study proposes a method using finite element models and 1D-CNN network to extract and classify vibration responses for crack detection. The results show that the proposed approach is effective in real-time damage detection.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Maryam Mirsalehi, Kiarash Kianpour, Sharif Shahbeyk, Mohammad Bakhshi
Summary: This study comprehensively investigates the one-way response of 3D-woven sandwich panels (3DWSPs) and their interfering parameters, providing interpretation of elastic and failure results, failure maps, and reliable theoretical models for linear elastic response and observed failure mechanisms.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Yiming Zhao, Zhonggang Wang, Zhigang Yang, Bin Qin
Summary: The paper proposes a Ritz and statistical energy analysis (Ritz SEA) hybrid method for calculating rectangular plate acoustic vibration coupling in the mid-frequency range. This method combines the fast convergence and ability to handle arbitrary boundary conditions of the Ritz method with the power flow equation of the statistical energy analysis method. The results show that this approach effectively filters out random fluctuations in mid-frequency domains while demonstrating exceptional stability and precision.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Joao Henrique Fonseca, Woojung Jang, Dosuck Han, Naksoo Kim, Hyungyil Lee
Summary: This study addresses the enhancement of an injection-molded fiber-reinforced plastic / metal hybrid automotive structure and its plastic injection molding process through the integration of the finite element method, artificial intelligence, and evolutionary search methods. Experimental validation of finite element models, the generation of a database through orthogonal array and Latin hypercube methods, and the training of artificial neural networks are conducted. The genetic optimization algorithm is then applied to identify optimal process parameters. The results show significant reduction in product warpage and manufacturing time while maintaining structural strength, contributing to the advancement of composite automotive structures with superior quality.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Alessandro Vescovini, Carina Xiaochen Li, Javier Paz Mendez, Bo Cheng Jin, Andrea Manes, Chiara Bisagni
Summary: This paper presents a study on six single-stringer specimens manufactured using the card-sliding technique with non-crimp fabrics and adopting a Double-Double (DD) stacking sequence. The specimens were tested under compression loading conditions to investigate post-buckling and failure in aerospace structures. Experimental results and numerical simulations were compared to analyze the behavior and failure modes of the specimens. The study found promising evidence of a viable solution to optimize aeronautical structures and enhance resistance to skin-stringer separation, particularly with the use of tapered flanges.
COMPOSITE STRUCTURES
(2024)