Article
Engineering, Civil
Serkan Guler
Summary: This study focused on the free vibration analyses of centrifugally stiffened cracked beams made of functionally graded materials in the axial direction. The Rayleigh-Ritz method was used to analyze the influence of various parameters on natural frequencies. Results indicated that an increase in the ratio of crack depth to thickness led to a decrease in fundamental frequency parameters, with the highest natural frequency droop near the root of the beam for flap-wise and chord-wise vibrations.
ENGINEERING STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Erasmo Carrera, Riccardo Augello, Alfonso Pagani, Xiangyang Xu
Summary: This study proposes a component-wise FE-CUF model for predicting the complete three-dimensional stress and strain states of reinforced concrete structures, showing advantages and superior performance.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2021)
Article
Engineering, Civil
Santiago Bertero, Pablo A. Tarazaga, Rodrigo Sarlo
Summary: This paper presents a new excitation method for in situ experimental modal analysis and compares its performance to ambient vibration analysis. The results show that the proposed method overcomes some limitations of the ambient vibration analysis and enables modal identification in a higher frequency range.
ENGINEERING STRUCTURES
(2022)
Article
Computer Science, Information Systems
Yu Qiu, Zhifeng Zhang
Summary: Strengthening the real-time and accurate identification of civil structures is crucial for ensuring the safety of buildings. This study combines deep learning methods with a benchmark numerical model to identify structural damage using a parallel convolutional neural network. The results demonstrate that this network structure can effectively extract damage signal features and achieve high recognition accuracy.
Review
Chemistry, Analytical
Philippe Gueguen, Ariana Astorga
Summary: This paper discusses the origins of torsion and its effect on the response of structures with a focus on the contribution of experimental data. Torsion increases stresses in structures during earthquakes, augmenting strain and damage.
Article
Environmental Sciences
Eugen Valentin Butila, Razvan Gabriel Boboc
Summary: This paper presents a systematic review of the application of unmanned aerial vehicles (UAVs) in civil engineering, with a focus on traffic monitoring. By analyzing selected papers, conclusions were drawn that this field is still in its early stages and that advancements in image processing and UAV technologies will result in a growing number of applications, bringing greater benefits to society.
Article
Engineering, Civil
Chunbao Xiong, Meng Wang, Wen Chen
Summary: This study used RTK-GNSS technology to monitor a super-high-rise building and a long-span bridge in China. The researchers investigated the effects of positioning errors and noise in different environments, and proposed a hybrid noise reduction algorithm to suppress noise. The results showed that the method applied can weaken noise and maintain adequate information.
JOURNAL OF CIVIL STRUCTURAL HEALTH MONITORING
(2022)
Article
Chemistry, Analytical
Kinzo Kishida, Michio Imai, Junichi Kawabata, Artur Guzik
Summary: This paper reviews recent progress in two critical areas of Distributed Fiber Optics Sensing (DFOS) implementation in large scale civil engineering structures: improvement in sensing accuracy and acquisition speed and robustness. The technology received high valuation from field engineers and greatly increases the practical possibility of installing FO cables.
Article
Engineering, Multidisciplinary
Sean McBane, Youngsoo Choi, Karen Willcox
Summary: Lattice-like structures often have high stiffness and light weight, but the computational cost of resolving the finite element mesh can be expensive. To address this issue, we propose a stress-constrained topology optimization method that utilizes reduced order models as a cost-effective surrogate, providing accurate computation of stress fields while significantly reducing run time.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Chemistry, Analytical
Martin Stolarik, Stanislav Kepak, Miroslav Pinka, Jakub Cubik, Jan Nedoma
Summary: This paper introduces a fiber optic-based seismic monitoring technology that utilizes a polarization fading-free fiber-optic interferometer for on-site vibration measurement. The experimental results show a high correlation with the field measurement data, with a small average deviation in the oscillation velocity amplitude of the optical sensor.
Review
Materials Science, Biomaterials
Elizabeth Footner, Kate Firipis, Emily Liu, Chris Baker, Peter Foley, Robert M. I. Kapsa, Elena Pirogova, Cathal O'Connell, Anita Quigley
Summary: In vitro human skin models have great potential in the study of skin biology and disorders, as well as drug testing and safety assessment. Recent advances in biofabrication techniques and biomaterials have enabled the creation of complex skin models that accurately mimic native human skin, allowing for more precise testing and modeling of skin behavior and response.
ACS BIOMATERIALS SCIENCE & ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Xiaohui Zeng, Xuemin Zhang, Xianshun Zhou, Ya Duan, Jin Chen
Summary: In order to ensure safe tunnel construction and optimize blast design parameters, it is crucial to understand the impact of the free surface on blast vibration attenuation. Previous studies have often only qualitatively evaluated the effect of the free surface on blast vibration, failing to quantify these impacts on vibration attenuation. In this paper, by analyzing the decay law of the blast vibration velocity under different free surfaces, we quantitatively assessed the effect of the number of free faces and burden distance on the peak vibration velocity.
APPLIED SCIENCES-BASEL
(2023)
Article
Mechanics
W. Chen, W. M. Luo, S. Y. Chen, L. X. Peng
Summary: A novel FSDT meshfree method based on 3D continuous shell theory and moving-least squares approximation is proposed in this paper for investigating the free vibration behavior of arbitrary laminated composite shells and spatial structures. The method has general geometric and kinematic descriptions, making it easier to be applied to complex laminated shell geometries. The convergence, accuracy, and applicability of the method have been demonstrated for laminated shells of different geometrical shell shapes.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Ahmed N. Uwayed, Khaldoon F. Brethee, Shiren O. Muhammad
Summary: Composite materials are widely used in structural design due to their mechanical properties and stiffness to weight ratio. However, damages such as fibre breakage and delamination can lead to stiffness reduction and functional loss. This study introduces a damage index based on mode shape curvature analysis, which proves to be effective in detecting and quantifying structural damages.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Mechanics
J. R. Cho
Summary: This study presents hierarchical models for cylindrical panels using the 2-D natural element method, and validates their performance in bending and free vibration through numerical experiments. The hierarchical models are able to accurately predict the central deflections and natural frequencies of the panels.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
A. Pagani, E. Carrera
Summary: A displacement-based high order one-dimensional (1D) finite element model is proposed in this paper for the nonlinear analysis of isotropic, slightly compressible soft material structures. The model, based on Carrera unified formulation and first-invariant hyperelasticity, can address simple to complex nonlinear hyperelastic phenomena.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Mechanics
A. Pagani, R. Azzara, E. Carrera
Summary: This study presents a novel numerical approach for studying the vibration behaviors of variable angle tow (VAT) composite structures. The method predicts buckling load, investigates frequency variation with increasing load, and verifies experimental results. The use of VAT composites improves buckling performance and design space.
Article
Materials Science, Multidisciplinary
AlfonsoJM Pagani, Riccardo Augello, Erasmo Carrera
Summary: In this article, the geometrical nonlinear behavior of deployable booms is investigated. A mathematical model based on Carrera unified formulation is proposed to describe the behavior of the booms. Experimental tests and investigation of different lamination sequences validate the proposed approach and offer valuable perspectives for future designs.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Sajedeh Khosravani, Mohammad Homayoune Sadr, Erasmo Carrera, Alfonso Pagani
Summary: In this study, randomly three-dimensional graphene foam (RGF) was synthesized and used to prepare RGF/epoxy composite material. Tensile testing showed that the drying percentage of RGF had a significant effect on the mechanical properties of the composite. Furthermore, multi-scale numerical methods were employed to obtain the mechanical properties of the RGF/epoxy composite material.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
J. Shen, M. R. T. Arruda, A. Pagani
Summary: This paper presents a numerical damage analysis method for concrete structures using higher-order beam theories based on Carrera Unified Formulation (CUF). A continuum damage mechanics model and a modified Mazars concrete damage model are used to model the concrete constitutive relation, and an expression is proposed to estimate the characteristic length to avoid mesh dependency. The proposed model is validated through comparison with experimental results, demonstrating its low computational costs and 3D accuracy.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Rodolfo Azzara, Matteo Filippi, Alfonso Pagani
Summary: This article investigates the dynamic nonlinear response of three-dimensional structures using variable-kinematics finite beam elements obtained with the Carrera Unified Formulation. The capabilities of the beam elements are assessed considering isotropic, homogeneous structures with compact and thin-walled sections.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Mechanics
E. Carrera, R. Augello, A. Pagani, D. Scano
Summary: This paper explores theories of structures based on hierarchical Jacobi expansions for the static analysis of multilayered beams, plates, and shells. These expansions belong to the family of classical orthogonal polynomials. The Carrera Unified Formulation (CUF) is employed, allowing for the generation of finite element stiffness matrices in a straightforward manner. Both layer-wise and equivalent single layer approaches are used in the analysis of one-dimensional beams and two-dimensional plates and shells, with multiple case studies analyzed. The convenience of using equivalent single layer models for displacement, in-plane stress, and shear stress calculations is demonstrated, while layer-wise models accurately predict structural behavior at the cost of higher degrees of freedom.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
J. A. Moreira, F. Moleiro, A. L. Araujo, A. Pagani
Summary: In this work, high-order layerwise modelling of variable stiffness composite laminates with curvilinear fibre paths using user-elements (UEL) in Abaqus is proposed. Two layerwise UEL models, UEL1 and UEL3, are developed and evaluated by comparing with existing solutions in the literature. The results show that the developed models can provide accurate and efficient results, particularly for predicting the global-local response behavior of moderately thick plates.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Sajedeh Khosravani, Mohammad Homayoune Sadr, Erasmo Carrera, Alfonso Pagani, Alberto Racionero Sanchez-Majano
Summary: In this study, a multi-scale method is used to calculate the coefficient of thermal expansion (CTE) and heat capacity of graphene foam (GF)/polymer composites. It was found that the composite consisting of GF with the highest density and lowest porosity has the minimum CTE. Additionally, the heat capacity of the composite depends not only on the heat capacity of the components but also on their Young modulus, CTE, and geometry.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Engineering, Multidisciplinary
A. Pagani, M. Petrolo, A. R. Sanchez-Majano
Summary: This study analyzes the stochastic response of fibre and matrix scale stresses in Variable Angle Tow (VAT) laminates affected by multiscale uncertainty defects. The aim is to evaluate the influence of innermost constituents on the overall structural response through accurate mechanical characterization at both macro- and microscales. The Carrera Unified Formulation (CUF) is used to obtain 2D and 1D models for respective scales. The use of these models proves convenient in terms of computational efficiency, which is important for uncertainty quantification.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Mina Jahanmardi, Hossein Hosseini-Toudeshky, Mohammad Saeed Goodarzi, Erasmo Carrera, Alfonso Pagani
Summary: In this study, a damage zone model was used to simulate the material behavior and damage evolution in PU elastomers with different shore hardness. Experimental tests were conducted to determine the material characteristics, and a numerical analysis procedure was developed to predict the damage evolution in the pure shear tearing specimen.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
E. Carrera, V. V. Zozulya
Summary: Higher order models of elastic composite multilayer shells of revolution are developed using the variational principle of virtual power for the 3-D linear anisotropic theory of elasticity and generalized series in the shell thickness coordinates. Different types of shells, including cylindrical and circular plated as well as parabolic, hyperbolic, and pseudo-spheric shells, are considered and solved analytically. Numerical calculations are performed using Mathematica. The resulting equations can be used for theoretical analysis, stress-strain state calculation, and thin-walled structure modeling.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Riccardo Augello, Alfonso Pagani, Erasmo Carrera
Summary: The aim of this study is to analyze the effect of different materials on the folding behavior of ultrathin tape spring hinges. A refined 2D shell model is developed using the Finite Element Method (FEM) combined with the Carrera Unified Formulation (CUF). The model is capable of dealing with different materials and can introduce different theoretical approximations automatically. The results, in the form of moment angle curves, are provided for different materials and structure thickness.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
M. Petrolo, A. Pagani, M. Trombini, E. Carrera
Summary: This study investigates the impact of voids in composite materials on local stress and plastic strain values through micromechanical analysis. The microscale Representative Volume Element (RVE) is modeled using refined 1D elements based on the Carrera Unified Formulation (CUF), resulting in reduced computational costs compared to standard 3D elements. The fibers are orthotropic and the matrix exhibits elastoplastic behavior. Random void distributions and statistical analyses are considered, along with the influence of RVE depth. The results demonstrate significant increases in mean and peak stress values as the void volume fraction increases, and deeper RVEs result in higher stress values.
MECHANICS OF MATERIALS
(2023)
Proceedings Paper
Engineering, Civil
Marco Enea, Alfonso Pagani, Erasmo Carrera
Summary: In recent years, machine learning algorithms have been widely used in structural health monitoring. Utilizing Artificial Neural Networks (ANN) and Convolutional Neural Networks (CNN), accurate mapping of damages in structures can be achieved through surface strain/displacement based detection. By using Carrera Unified formulation (CUF) based finite element models and Monte Carlo simulations, the trained CNN is capable of detecting and classifying all damages within the structure.
EUROPEAN WORKSHOP ON STRUCTURAL HEALTH MONITORING (EWSHM 2022), VOL 3
(2023)
Article
Acoustics
Sandip Chajjed, Mohammad Khalil, Dominique Poirel, Chris Pettit, Abhijit Sarkar
Summary: This paper reports the generalization of the Bayesian formulation of the flutter margin method, which improves the predictive performance by incorporating the joint prior of aeroelastic modal parameters. The improved algorithm reduces uncertainties in predicting flutter speed and can cut cost by reducing the number of flight tests.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Pascal Zeise, Bernhard Schweizer
Summary: Air ring bearings are an improved version of classical air bearings, providing better damping behavior and allowing operation above the linear threshold speed of instability. However, there is a risk of dangerous vibrations in certain rotor systems, which can be addressed by considering ring tilting effects.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Zbynek Sika, Jan Krivosej, Tomas Vyhlidal
Summary: This paper presents a novel design of a compact six degrees of freedom active vibration absorber with six identical eigenfrequencies. The objective is to completely suppress the vibration of a machine structure with six motion components. By utilizing a Stewart platform structure equipped with six active legs, a spatial unifrequency absorber with six identical eigenfrequencies is achieved. The design is optimized using a correction feedback and active delayed resonator feedback.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Kai Li, Yufeng Liu, Yuntong Dai, Yong Yu
Summary: This paper presents a novel light-powered self-oscillating liquid crystal elastomer (LCE) bow that can self-oscillate continuously and periodically under steady illumination. The dynamics of the LCE bow are theoretically investigated and numerical calculations predict its motion regimes. The suggested LCE bow offers potential advantages in terms of simple structure, customizable size, flexible regulation, and easy assembly.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Carmelo Rosario Vindigni, Giuseppe Mantegna, Calogero Orlando, Andrea Alaimo
Summary: In this study, a simple adaptive flutter suppression system is designed to increase the operative speed range of a wing-aileron aeroelastic plant. The system achieves almost strictly passivity by using a parallel feed-forward compensator implementation and the controller parameters are optimized using a population decline swarm optimization algorithm. Numerical simulations prove the effectiveness of the proposed simple adaptive flutter suppression architecture in different flight scenarios.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Nicco Ulbricht, Alain Boldini, Peng Zhang, Maurizio Porfiri
Summary: The quantification of fluid-structure interactions in marine structures is crucial for their design and optimization. In this study, an analytical solution for the free vibration of a bidirectional composite in contact with a fluid is proposed. By imposing continuity conditions and boundary conditions, the coupled fluid-structure problem is solved and applied to sandwich structures in naval construction, offering insights into the effects of water on mode shapes and through-the-thickness profiles of displacement and stress.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Shahram Hadian Jazi, Mostafa Hadian, Keivan Torabi
Summary: Non-uniformity and damage are the main focus in studying vibrations of beam elements. An exact closed-form explicit solution for the transverse displacement of a nonuniform multi-cracked beam is introduced using generalized functions and distributional derivative concepts. By introducing non-dimensional parameters, the motion equation and its closed-form solution are obtained based on four fundamental functions. The impact of crack count, location, intensity, and boundary conditions on natural frequency and mode shape is evaluated through numerical study.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Eugenio Tramacere, Marius Pakstys, Renato Galluzzi, Nicola Amati, Andrea Tonoli, Torbjoern A. Lembke
Summary: This paper proposes the experimental stabilization of electrodynamic maglev systems by means of passive components, providing key technological support for the Hyperloop concept of high-speed and sustainable transportation.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Pengfei Deng, Xing Tan, He Li
Summary: In this paper, the authors improve the surface morphology method and study the bit-rock interaction model between the rock and the PDC bit, taking into account the impact of blade shape and cutter arrangement. They establish a dynamic model for a deep drilling system equipped with an arbitrary shape PDC bit and propose a stability prediction method. The results show that the shape of the blades and arrangement of the cutters on the PDC bit significantly affect the nonlinear vibration of the drilling system.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Salvador Rodriguez-Blanco, Javier Gonzalez-Monge, Carlos Martel
Summary: In modern LPT designs, the simultaneous presence of forced response and flutter in different operation regimes is unavoidable. Recent evidence suggests that the traditional linear superposition method may be overly conservative. This study examines the flutter and forced response interaction in a realistic low pressure turbine rotor and confirms that the actual response is much smaller than that predicted by linear superposition.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Kabilan Baskaran, Nur Syafiqah Jamaluddin, Alper Celik, Djamel Rezgui, Mahdi Azarpeyvand
Summary: This study investigates the impact of the number of blades on the aeroacoustic characteristics and aerodynamic performance of propellers used in urban air mobility vehicles. The results show that different blade numbers exhibit distinct noise levels, providing valuable insights for further research on propeller noise and aerodynamic performance.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Yongbo Peng, Peifang Sun
Summary: This study focuses on the reliability-based design optimization (RBDO) of the tuned mass-damper-inerter (TMDI) system under non-stationary excitations. The performance of the optimized TMDI system is evaluated using probability density evolution analysis. The results demonstrate the technical advantages of TMDI, including high vibration mitigation performance, considerable mass reduction, and less stroke demand.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Guanfu Lin, Zhong-Rong Lu, Jike Liu, Li Wang
Summary: Vision-based measurement is an emerging method that enables full-field measurement with non-contact and high spatial resolution capabilities. This paper presents a single-camera method for measuring out-of-plane vibration of plate structures using motion-parametric homography to capture image variation and displacement response.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Bronislaw Czaplewski, Mateusz Bocian, John H. G. Macdonald
Summary: Despite two decades of study, there is currently no model that can quantitatively explain pedestrian-generated lateral forces. This research proposes a foot placement control law based on empirical data to calibrate and generalize the rigid-leg inverted pendulum model (IPM) for predicting lateral structural stability.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Justine Carpentier, Jean-Hugh Thomas, Charles Pezerat
Summary: This paper proposes an improved method for the identification of vibration sources on a car window using the corrected force analysis technique. By redefining inverse methods in polar coordinates, more accurate results can be obtained.
JOURNAL OF SOUND AND VIBRATION
(2024)
