Article
Chemistry, Multidisciplinary
Andrea Francesco Russillo, Giuseppe Failla, Ada Amendola, Raimondo Luciano
Summary: This paper focuses on the free vibrations of locally resonant metamaterial plates with viscously damped resonators. A dynamic-stiffness model is formulated and a contour-integral algorithm is used to calculate the complex eigenvalues with remarkable computational efficiency. The results are important for the design and investigation of wave attenuation properties of metamaterial plates.
Article
Engineering, Multidisciplinary
Wenxiong Li, Suiyin Chen
Summary: An improved model order reduction method is proposed for dynamic analysis of large-scale structures with local nonlinearities. The method reconstructs the reduced system adaptively based on the expressions of element generalized deformation. A novel Newton iteration approach with Krylov subspace methods is introduced to efficiently solve the reduced system. An alternating iterative solution algorithm is developed to extend the application scope for structural systems with both pseudo-static and parameterized dynamic models. Numerical investigations show that the proposed methods significantly improve the efficiency of dynamic analysis for large-scale structures with local nonlinearities.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Acoustics
Hongye Ma, Ke Wang, Haifeng Zhao, Chong Zhao, Jing Xue, Chao Liang, Bo Yan
Summary: This paper proposes a tunable local resonance metamaterial with chiral buckling structures for low-frequency vibration isolation. The unit cell consists of the inner and outer buckling stiffness structure, basic structure, and local resonator. The bistability of the unit cells with different initial shapes of beams is investigated and compared. The dynamic responses of the metamaterial with simple unit cells and hybrid supercells are derived and analyzed. The results show that the unit cell with initially convex downward beams has strong bistability and determinate deformation modes. The metamaterial with simple unit cells has tunable and wide band gap and low-frequency vibration isolation. The metamaterial with hybrid supercells can further broaden the band gap width and lower the band gap frequency, which has up to 16 different band gap characteristics.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Engineering, Mechanical
Dong Wang
Summary: The proposed method utilizes local nonlinear transformation reduction and iteration vector update to effectively predict the steady-state nonlinear dynamic responses of complex jointed structures by extracting transfer functions only related to nonlinear joints, demonstrating higher computational efficiency.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Engineering, Civil
Andrea Francesco Russillo, Giuseppe Failla
Summary: This paper proposes an exact reduced-order dynamic-stiffness model for studying the dynamics of two-dimensional hierarchical beam lattices. The model accurately condenses the nodal degrees of freedom of the lattice structure internal to the unit cell and connected to the primary nodes, and allows for the exact modal response to external loading in both time and frequency domains. The proposed model is validated through numerical comparisons with standard finite-element solutions in ABAQUS.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Mechanical
Wu Shengli, Xing Wenting, Liu Ying, Shao Yimin
Summary: A time-varying oil film stiffness model based on elastohydrodynamic lubrication theory was proposed to analyze vibration characteristics of a roll mill, along with a new real-time method for identifying defect sizes during the rolling process. The effectiveness of the model was validated through agreement between simulated and experimental results, providing theoretical support for identifying local defects based on changes in oil film stiffness and roll mill vibration characteristics for different defect sizes on the roll surface.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Energy & Fuels
L. X. Wang, J. H. Zheng, Z. G. Li, Z. X. Jing, Q. H. Wu
Summary: This paper proposes an order reduction method (ORM) to handle the complex dynamics of heterogeneous integrated energy systems (HIES). The ORM combines model partitioning and modal synthesis techniques to effectively simulate high-order dynamics, with advantages in both computation accuracy and time.
Article
Computer Science, Interdisciplinary Applications
Quincy A. Huhn, Mauricio E. Tano, Jean C. Ragusa, Youngsoo Choi
Summary: Dynamic Mode Decomposition (DMD) is a model-order reduction technique that extracts spatial modes of fixed temporal frequencies from numerical or experimental data. This paper presents two novel approaches to parametric DMD: one based on interpolation of the reduced-order DMD eigen-pair and the other based on interpolation of the reduced DMD (Koopman) operator. Numerical results are provided for diffusion-dominated nonlinear dynamical problems, including a multiphysics radiative transfer example. The three parametric DMD approaches are compared.
JOURNAL OF COMPUTATIONAL PHYSICS
(2023)
Article
Engineering, Civil
K. Khlifi, J. B. Casimir, A. Akrout, M. Haddar
Summary: A novel Levy series is proposed in this paper for developing a dynamic stiffness matrix for a completely free orthotropic Kirchhoff plate, based on the Kirchhoff-Love thin-plate theory. The new Levy series allows for deriving the dynamic stiffness matrix without classical symmetry decomposition, simplifying the building procedure. By comparing the harmonic responses obtained by this method with those from the finite element method, the rate of convergence and the degree of precision of the current formulation are established.
ENGINEERING STRUCTURES
(2021)
Article
Computer Science, Interdisciplinary Applications
Wenguo Hou, Jing Xiong, Zeyang Xia
Summary: A new method is proposed for dynamic modeling of soft tissue deformation, which includes two integrated schemes for sub-space construction and estimation of internal elastic forces. The proposed method achieves higher computational efficiency and comparable accuracy compared to the finite element method in full-space. It is suitable for online clinical scenes.
JOURNAL OF COMPUTATIONAL SCIENCE
(2023)
Article
Engineering, Mechanical
J. -M. Mencik, N. Bouhaddi
Summary: In this paper, a model reduction method is proposed for the dynamic reanalysis of structures with geometric variability and parametric uncertainties. Geometric variability is introduced by distorting the finite element meshes for some substructures via arbitrary shape functions. Parametric uncertainties are also considered to describe local variations of the stiffnesses of the substructures. The proposed approach involves expressing the substructure transformation matrices using interpolated matrices of Craig-Bampton component modes together with matrices of enrichment vectors. These enrichment vectors are parameter-independent and, as such, they only need to be computed once. This, as a result, leads to reduced substructure models which can be quickly updated to reanalyze structures with geometric and parametric changes. The accuracy and numerical efficiency of the proposed approach are highlighted through numerical experiments.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Acoustics
Muhammad, Sayed Iftikhar Hussain, C. W. Lim
Summary: The study investigates a composite trampoline pillar-plate structure that can exhibit an ultrawide local resonance bandgap, reduce plate stiffness and enhance effective mass density, leading to an enlarged local resonance bandgap. Both numerical and experimental results confirm the effectiveness of the structure in attenuating bulk waves over a broad frequency spectrum.
Article
Engineering, Multidisciplinary
Ebrahim Sotoudehnia, Farzad Shahabian, Ahmad Aftabi Sani
Summary: An iterative method is proposed to reduce the order of the coupled eigenvalue problem in fluid-structure interaction systems, achieving a significant decrease in computational costs while maintaining the accuracy of modal outputs. The results demonstrate the effectiveness of the method in reducing the order of eigenvalue problems in fluid-structure systems.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Acoustics
Konstantinos Vlachas, Konstantinos Tatsis, Konstantinos Agathos, Adam R. Brink, Eleni Chatzi
Summary: Efficient condition assessment of engineered systems requires coupling high fidelity models with data extracted from the current system state. This paper proposes a parametric Model Order Reduction (pMOR) scheme for nonlinear structural dynamics, demonstrating its performance on different case studies.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Engineering, Mechanical
Mohammad Hossein Abbasi, Laura Iapichino, Wil Schilders, Nathan van de Wouw
Summary: This paper proposes a data-based approach for model order reduction that preserves incremental stability properties. The method is applied to the discretized version of hyperbolic equations, successfully reducing complexity and maintaining the stability properties of the original system.
NONLINEAR DYNAMICS
(2022)
Article
Mechanics
Andrea Francesco Russillo, Giuseppe Failla, Fernando Fraternali
Summary: This paper presents a novel and exact analytical approach for locally-resonant sandwich beams, providing analytical expressions for frequency response and modal response under arbitrary loads. The proposed complex modal analysis approach solves the challenging issue of calculating all complex eigenvalues, ensuring exactness and robustness of the framework for any number of resonators and degrees of freedom within the resonators.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2021)
Article
Mechanics
Roberta Santoro, Giuseppe Failla
Summary: This paper discusses the frequency response of beams in the presence of interval parameters and proposes a two-step method to calculate the bounds of all response variables. Each crack is modeled as a linearly-elastic rotational spring with uncertain-but-bounded stiffness and position parameters using the standard Euler-Bernoulli beam theory. The method relies on analytical forms for all response variables and their sensitivity functions, showing potential and accuracy in applications focusing on the frequency response of multi-cracked beams with tuned mass dampers.
Article
Mechanics
Andrea Burlon, Gioacchino Alotta, Mario Di Paola, Giuseppe Failla
Summary: This work deals with viscoelastic constitutive models involving variable-order fractional operators. Two main fractional models in the literature represent the stress-strain relation of viscoelastic materials with time-varying mechanical properties, with one of them appearing to be more meaningful. A novel formulation is proposed to effectively compute the strain response of a viscoelastic material with time-dependent mechanical properties due to any stress input, showing a clear physical meaning and a consistent application of the Boltzmann superposition principle. The paper's main contribution is to establish the relationship between the proposed formulation and the existing meaningful fractional model in the literature.
Article
Engineering, Civil
Andrea Burlon, Giuseppe Failla
Summary: In this study, a comprehensive framework is introduced to address the triply-coupled bending-torsion problem in beams with asymmetric cross section, considering warping effects and obtaining responses in frequency and time domains under arbitrary loads. The proposed approach utilizes Laplace Transform and the theory of generalized functions to derive exact solutions under proportional damping, which are easy to implement. This framework is also extended to beams with in-span transversal stiffeners, external supports, and non-proportional damping scenarios, providing a versatile tool for dynamic analysis.
THIN-WALLED STRUCTURES
(2021)
Article
Engineering, Multidisciplinary
Andrea Francesco Russillo, Giuseppe Failla, Gioacchino Alotta
Summary: A novel concept of locally-resonant inertant plate is proposed, which can create a very large band gap in the low-frequency range through periodic inerter-based resonator structures, and it is of significant importance to structural and mechanical engineering applications.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Engineering, Mechanical
Andrea Francesco Russillo, Giuseppe Failla
Summary: This paper focuses on the elastic wave propagation analysis of small-size planar beam lattices, proposing two novel computational approaches and comparing their advantages. Dispersion curves for a typical lattice are calculated to highlight the role of nonlocality.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Mechanical
Andrea Burlon, Giuseppe Failla
Summary: This study introduces a theoretical framework for calculating the dispersive properties of locally-resonant beams with beam-like resonators, and suggests that coupled bending-torsion beam-like resonators may be more efficient than uncoupled ones.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Civil
Andrea Francesco Russillo, Giuseppe Failla
Summary: This paper proposes an exact reduced-order dynamic-stiffness model for studying the dynamics of two-dimensional hierarchical beam lattices. The model accurately condenses the nodal degrees of freedom of the lattice structure internal to the unit cell and connected to the primary nodes, and allows for the exact modal response to external loading in both time and frequency domains. The proposed model is validated through numerical comparisons with standard finite-element solutions in ABAQUS.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Civil
Gioacchino Alotta, Chiara Biondo, Agathoklis Giaralis, Giuseppe Failla
Summary: The tuned inerter damper (TID) is a new resonant vibration absorber that reduces the requirement for large secondary mass in conventional tuned mass dampers (TMDs) for seismic protection of building structures. This paper extends the application of TID to the seismic response reduction of the supporting towers of land-based wind turbines (WTs). Numerical assessment shows that installing the TID closer to the tower top and increasing the inertance and/or distance of the attachment locations improves the TID vibration suppression performance. The TID achieves significant reductions in tower top displacement, acceleration, base shear, and bending moment, outperforming a conventional TMD.
Article
Engineering, Civil
Gioacchino Alotta, Valentina Laface, Giuseppe Failla, Carlo Ruzzo, Felice Arena
Summary: This paper proposes a innovative concept of floating absorber for motion mitigation in floating wind turbines on spar supports. Extensive time-domain numerical simulations are performed to validate the effectiveness of the floating absorber in reducing the pitch motion of the floating wind turbine. The results demonstrate the great potential of the proposed concept for motion mitigation in floating wind turbines.
ENGINEERING STRUCTURES
(2023)
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)
