Article
Materials Science, Multidisciplinary
David Hoffmeyer, Jan Hogsberg
Summary: This study discusses the damping of torsional vibrations in beams using discrete axial viscous dampers in configurations constituting bimoments. It is found that the use of calibrated parameters with the governing differential equation can accurately determine damped frequencies and damping ratios, with significant damping ratios obtained for the lowest torsional mode.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2021)
Article
Engineering, Mechanical
Brian Painter, Giovanni Ferrari, Marco Amabili
Summary: In pressurized water reactors, accurate modeling of fuel rod dynamics is crucial to prevent excessive wear caused by turbulent fluid forces. The use of spacer grids with specific design to restrain the fuel rod and generate nonlinear boundary conditions can lead to complex dynamic responses. Experimental studies on nonlinear vibration of fuel rods supported by spacer grids have demonstrated good agreement between model predictions and actual results.
NONLINEAR DYNAMICS
(2022)
Article
Mechanics
Burak Gulsacan, Matteo Aureli
Summary: In this work, a comprehensive experimental study on the harmonic oscillations of rigid plates with H-shaped cross sections in a viscous fluid environment is presented. The focus is on investigating the effect of flange size on fluid-structure interaction by studying vortex shedding and convection dynamics. Particle image velocimetry experiments are performed to analyze the flow physics, including pathlines, vortex shedding and dynamics, hydrodynamic regimes, and steady streaming. The contributions of this work include phase diagrams demonstrating the effect of flange ratio on regime transitions and investigating the interactions between vortices and the plate structure.
Article
Acoustics
Prabakaran Balasubramanian, Giulio Franchini, Giovanni Ferrari, Brian Painter, Kostas Karazis, Marco Amabili
Summary: The experimental vibration responses of beams with nonlinear boundary conditions were interpreted using a bilinear spring model. It was found that the boundary conditions transitioned from rotational linear stiffness at low vibration amplitudes to bilinear stiffness with hysteresis at higher amplitudes. The model accurately reproduced the experimental results without the need for parameter adjustment at different excitation levels.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Mathematics, Applied
Harold Berjamin, Michel Destrade
Summary: This study investigates directional shear waves in soft elastic solids governed by nonlinear equations, proposing a variable transformation method for numerical solution and validating it against analytical solutions. The results demonstrate the generation of odd harmonics and second-order harmonics in a Gaussian shear-wave beam.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2021)
Article
Physics, Applied
H. Ebrahimi, M. Krsmanovic, H. Ali, R. Ghosh
Summary: Biomimetic scale-covered substrates exhibit emergent nonlinearities due to the geometry of collective scales contacts. While their elastic nonlinearity has been well studied, their dissipative behavior arising from scales sliding remains relatively unexplored. This study investigates the synergistic effects of material viscoelasticity and geometrical frictional scales contact on damping in architectured systems. The results show that viscoelastic damping follows a different damping envelope than dry friction, with varying effects on damping symmetry and specific damping capacity.
APPLIED PHYSICS LETTERS
(2023)
Article
Mechanics
H. Bagheri, Y. Kiani, M. R. Eslami
Summary: This study investigates the dynamic response of hermetic capsule construction made of functionally graded materials under thermal shock. Material properties are derived using the Voigt and Toloukian models, taking into account the dependence on position and temperature. A one-dimensional transient heat transfer equation is established and solved using the Crank-Nicholson approximation and Picard's iterative method with the GDQ numerical method. The resulting temperature distribution is then used to determine the thermal force and moment. The equations of motion are derived using the first-order shear theory and the von Karman form of geometric non-linearity, and solved using the Newton-Raphson iterative approach and the ss-Newmark time estimate approach.
Article
Engineering, Multidisciplinary
Elisa Biagioli, Mattia de' Michieli Vitturi, Fabio Di Benedetto
Summary: Shallow water equations are widely used in simulating geophysical flows with much greater horizontal length scale than vertical scale. A modified model with an additional transport equation and shape coefficients is presented, discretized with a modified finite volume central-upwind scheme. Numerical experiments validate the proposed method's effectiveness.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Construction & Building Technology
Haotian Tao, Huifeng Yang, Jin Zhang, Gaoyan Ju, Jiawei Xu, Benkai Shi
Summary: This study evaluated the computational effectiveness of various dimensional finite element models for timber-concrete composite (TCC) beams. The results showed that the 1D and 2D models had higher computational efficiency than the 3D model. The 3D model, however, presented the failure modes of TCC beams more accurately. Overall, the FE models were validated to be feasible for further studies on TCC structures.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Engineering, Mechanical
Saeed Lotfan, Mirmeysam Rafiei Anamagh, Bekir Bediz, Ender Cigeroglu
Summary: The current study aimed to develop an accurate model to investigate nonlinear resonances in an axially functionally graded beam rotating with time-dependent speed. Stiffening and Coriolis effects were modeled based on nonlinear strain relations, and equations governing deformations and rotating speed variation were obtained. Multi-mode discretization and spectral Chebyshev approach were used to study the nonlinear behavior, and results were validated through literature comparison and numerical simulations. The study found properties of functionally graded material and values of average rotating speed leading to internal resonance in the system, showing complex nonlinear behavior under rotating speed fluctuation.
NONLINEAR DYNAMICS
(2022)
Article
Chemistry, Physical
Ahmed Bahgat Tawfik, Sameh Youssef Mahfouz, Salah El-Din Fahmy Taher
Summary: This study conducted numerical analysis on notched plain and reinforced concrete beams using different crack simulation techniques and investigated the effects of various parameters on the flexural response. The results showed that XFEM and VCCT produced better results compared to CIT, and that reducing initial notch-to-depth ratio and shear span-to-depth ratio increased flexural capacity. Additionally, the use of external post-tensioning and reinforcement improved the ductility and flexural capacity of the beams.
Article
Engineering, Mechanical
Marielle Debeurre, Aurelien Grolet, Olivier Thomas
Summary: This paper investigates the effect of gravity on the nonlinear extreme amplitude vibrations of a slender, vertically oriented cantilever beam. A finite element discretization of the geometrically exact beam model is used to model the extreme nonlinear vibrations, solved in the frequency domain through harmonic balance and a continuation method. The study shows that the large amplitude vibrations depend primarily on two parameters: a geometric parameter and a gravity parameter, with gravity causing different behaviors in both standing and hanging configurations.
NONLINEAR DYNAMICS
(2023)
Article
Mechanics
Claudio Boni, Gianni Royer-Carfagni
Summary: This paragraph discusses the characteristics of flexural tensegrity structures and the effects of nonlinear behavior on bending stiffness and structural damping. It also analyzes the vibration properties under harmonic excitation and the phenomena of parametric resonance.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2021)
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
Computer Science, Interdisciplinary Applications
Isabel Echeverribar, Sergio Martinez-Aranda, Javier Fernandez-Pato, Pilar Garcia-Navarro
Summary: Numerical simulation of unsteady viscous flow over variable topography under the influence of temperature changes is a challenge. To tackle this, the model complexity is reduced from 3D to 2D by depth averaging the equations and parallelization techniques are applied for efficient simulation. A generic model applicable to a wide range of viscous fluids and validated with synthetic cases is presented. The model is applied to a realistic lava flow case and compared to satellite observations, showing efficient results within a short simulation time.
ADVANCES IN ENGINEERING SOFTWARE
(2023)
Article
Computer Science, Information Systems
Shinnosuke Nakayama, Tyrone J. Tolbert, Oded Nov, Maurizio Porfiri
JOURNAL OF THE ASSOCIATION FOR INFORMATION SCIENCE AND TECHNOLOGY
(2019)
Article
Mechanics
Peng Zhang, Maurizio Porfiri
COMPOSITE STRUCTURES
(2019)
Article
Health Care Sciences & Services
Roni Barak Ventura, Shinnosuke Nakayama, Preeti Raghavan, Oded Nov, Maurizio Porfiri
JOURNAL OF MEDICAL INTERNET RESEARCH
(2019)
Article
Chemistry, Analytical
Tony Jaquez-Moreno, Matteo Aureli, Ryan C. Tung
Article
Physics, Multidisciplinary
Shinnosuke Nakayama, Vrishin R. Soman, Maurizio Porfiri
Article
Mechanics
Syed N. Ahsan, Matteo Aureli
Article
Entomology
Jacob G. Holland, Shinnosuke Nakayama, Maurizio Porfiri, Oded Nov, Guy Bloch
Summary: The specialization of individual behaviors can enhance group performance, but may also hinder task switching in response to changing group needs. In bumble bee colonies, body size influences the tasks that bees perform, leading to specialized tasks for large and small bees. Results from experimental manipulations suggest that an interplay between specialization and plasticity is crucial for colony performance.
Article
Engineering, Mechanical
Enver S. Karakas, Nehir Tokgoz, Hiroyoshi Watanabe, Matteo Aureli, Cahit A. Evrensel
Summary: This paper investigates and compares four commonly used flow transport equation-based cavitation models and their applicability in an industrial centrifugal pump. Through comparing experimental and simulation results, the most suitable cavitation model and empirical constants are determined, and the accuracy of each model in predicting bubble formation and growth is analyzed.
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
(2022)
Article
Physics, Multidisciplinary
M. Aureli, J. A. Hanna
Summary: In this study, a new approach is proposed to evolve conserved quantities in a dynamical system by constructing a multiparameter family of systems, where these quantities evolve monotonically and proportionally, replaced by linear combinations of themselves. This method provides a generalized structure for selective dissipation techniques in the literature on fluids, plasmas, nonequilibrium thermodynamics, and nonlinear controls.
PHYSICAL REVIEW LETTERS
(2021)
Article
Instruments & Instrumentation
Rebecca Histed, Justin Ngo, Omar A. Hussain, Chantel K. Lapins, Omid Fakharian, Kam K. Leang, Yiliang Liao, Matteo Aureli
Summary: This study focuses on the development of tailored 3D-structured polymer-metal interfaces to create enhanced eIPMC sensors for soft, self-powered, high sensitivity strain sensor applications. Through advanced additive manufacturing and minimal physics-based chemoelectromechanical models, the eIPMC sensors demonstrate improved electrochemical properties and compression sensing performance. Alternative fabrication methods such as filament-based fused-deposition manufacturing and stencil printing also show enhanced sensing performance against traditional IPMC sensors.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Mechanics
Aditya G. G. Nair, James Hanna, Matteo Aureli
Summary: In two-dimensional decaying homogeneous isotropic turbulence, kinetic energy and enstrophy are transferred to larger and smaller scales, respectively. It is challenging to identify the important flow structures that govern this behavior in such complex dynamics. Two flow-modification strategies are proposed and implemented, leveraging the inviscid global conservation of energy and enstrophy to selectively and simultaneously change these quantities and guide the system towards steady-state or late-stage behavior. One strategy is based on local flow field information, while the other is global. Various flow structures excited by these modified inputs are observed and compared with recent literature. Energy modification excites smaller wavenumber structures in the flow, while enstrophy modification differs.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
Burak Gulsacan, Matteo Aureli
Summary: In this work, a comprehensive experimental study on the harmonic oscillations of rigid plates with H-shaped cross sections in a viscous fluid environment is presented. The focus is on investigating the effect of flange size on fluid-structure interaction by studying vortex shedding and convection dynamics. Particle image velocimetry experiments are performed to analyze the flow physics, including pathlines, vortex shedding and dynamics, hydrodynamic regimes, and steady streaming. The contributions of this work include phase diagrams demonstrating the effect of flange ratio on regime transitions and investigating the interactions between vortices and the plate structure.
Article
Acoustics
Rafiul Shihab, Tasmirul Jalil, Burak Gulsacan, Matteo Aureli, Ryan Tung
Summary: A method is proposed to tune the stiffness and natural frequencies of a microplate sensor for atomic force microscope applications, allowing resonance amplification at a broad range of frequencies. The feasibility of the method is verified through a macroscale experiment and microscale finite element analysis. This study aims to facilitate the development of curvature-based microscale sensors for atomic force microscopy applications.
JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME
(2021)
Proceedings Paper
Engineering, Multidisciplinary
Peng Zhang, Elizabeth Krasner, Sean D. Peterson, Maurizio Porfiri
BIOINSPIRATION, BIOMIMETICS, AND BIOREPLICATION IX
(2019)
Proceedings Paper
Engineering, Multidisciplinary
Yanpeng Yang, Brandon LeMay, Rana El Khoury, Romain J. G. Clement, Stefano Ghirlanda, Maurizio Porfiri
BIOINSPIRATION, BIOMIMETICS, AND BIOREPLICATION IX
(2019)
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)