Article
Engineering, Multidisciplinary
Guozhe Shen, Yang Xia, Weidong Li, Guojun Zheng, Ping Hu
Summary: Peridynamics is a nonlocal theory that can handle easily discontinuities such as cracks, even though it is computationally more expensive. The study introduces new PD beam and shell models based on micro-beam bond and Timoshenko beam theory, with interpolation method used for describing various deformations and strain energy densities. The high precision of PD beam and shell models is proven through simulation results.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Mechanics
S. Ali Faghidian, Isaac Elishakoff
Summary: This paper highlights the importance of the shear coefficient in the Timoshenko-Ehrenfest beam theory and addresses the challenge of determining the appropriate formula for solid rectangular cross-sections. A variational framework is proposed to establish a consistent shear coefficient for prismatic beams, and the efficacy of the introduced coefficient is demonstrated through the discussion of intrinsic anomalies.
Article
Acoustics
J. W. Yan, W. Zhang
Summary: This paper introduces a new method to precisely measure the thickness of one-atomic materials using the atomistic-continuum method. It accurately determines the wall thickness of graphene, Young's modulus, and bending rigidity, and confirms the accuracy through vibration studies and different models. The study also discusses the usage of scale parameter and value.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Mechanics
Zhiwei Huang, Yufeng Xing, Yahe Gao
Summary: This method presents a new approach for predicting stiffness of periodic beam-like structures based on the selfequilibrium equation of the unit cell. The effective stiffness matrix of a periodic heterogeneous beam is explicitly formulated, and six normalization constraints are introduced to determine the unique solution of the selfequilibrium equation of the unit cell. A standard finite element formulation for calculating warping displacements is derived using the principle of the minimum potential energy.
COMPOSITE STRUCTURES
(2021)
Article
Mathematics, Applied
Hayri Metin Numanoglu, Hakan Ersoy, Bekir Akgoz, Omer Civalek
Summary: This study investigates the size-dependent thermo-mechanical vibration analysis of nanobeams by implementing Hamilton's principle and the stress equation of nonlocal elasticity theory. The finite element method is used to solve the eigenvalue problem and derive stiffness and mass matrices. Nonlocal finite element method is emphasized for analyzing the vibration behavior of nanobeams under different boundary conditions.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2022)
Article
Engineering, Multidisciplinary
Mohammad Reza Vaziri Sereshk, Eric J. Faierson
Summary: In order to determine shear response for lattices, relevant standards were studied and a V-notched beam shear test set-up was developed. Various considerations and features were taken into account, including the number of cells for representative properties, the free-end condition for pure shear loading, and the use of Digital Image Correlation (DIC) method for improved accuracy. The obtained shear properties can be used for material specification, research and development, and structural design and analysis of lattices.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Mechanics
Feifei Zhao, Hong Bao, Jianfeng Liu, Kexiang Li
Summary: An accurate and effective reconstruction method for multilayered composite and sandwich laminated beam deformation field is proposed in this study. The method uses inverse finite element and Refine Zigzag Theory to improve reconstruction accuracy. Experimental results demonstrate superior accuracy and potential applicability of the proposed approach for accurate shape prediction.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Multidisciplinary
Said Mesmoudi, Omar Askour, Mohammed Rammane, Oussama Bourihane, Abdeljalil Tri, Bouazza Braikat
Summary: This study couples the spectral Chebyshev differential quadrature method with the high order continuation method for analyzing the nonlinear bending and buckling behavior of functionally graded sandwich beams. It investigates the influence of different parameters on the performance of FG sandwich beams.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2022)
Article
Mathematics, Applied
Erwin Hernandez, Jesus Vellojin
Summary: This paper analyzes the response of an isotropic non-uniform linear viscoelastic Timoshenko beam using a modified constitutive law in a hereditary integral form. A mixed method framework is used to provide stable and semi-discrete error estimates, with numerical experiments showing good performance in both quasi-static and transient cases.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2021)
Article
Engineering, Mechanical
Andras Szekrenyes
Summary: In this work, the stability of the DCB and 4ENF fracture specimens is analyzed using beam theories and the compliance calibration method. The main goal is to investigate the influence of linear springs on crack propagation stability. A large number of experiments were carried out, including crack initiation tests, compliance datasets, and qualitative observations. The results indicate that the stability of the DCB specimen is worse with smaller spring stiffness, while the 4ENF test cannot be destabilized regardless of additional spring stiffness.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Engineering, Aerospace
Yufeng Xing, Lingyu Meng, Zhiwei Huang, Yahe Gao
Summary: This paper presents a novel superposition method for effectively predicting the microscopic stresses of heterogeneous periodic beam-like structures. The method combines the solutions of the microscopic unit cell problem with the solutions of the macroscopic equivalent beam problem to accurately and effectively predict the microscopic stresses of whole composite beams. The method is applicable to composite beams with arbitrary periodic microstructures and load conditions.
Article
Engineering, Mechanical
Isaac Elishakoff, Marco Amato
Summary: This paper discusses flutter in a uniform and homogeneous beam under gas flow, considering shear deformation and rotary inertia effects with a truncated Timoshenko-Ehrenfest beam model. It compares the simplified equations with the original Timoshenko-Ehrenfest equations, showing that the former is more consistent and significantly simplifies analytical and numerical analyses. The critical flutter velocities obtained from the simplified equations are compared with those from the original set, highlighting the benefits of the simpler and more consistent approach.
INTERNATIONAL JOURNAL OF MECHANICS AND MATERIALS IN DESIGN
(2021)
Article
Mathematics, Interdisciplinary Applications
K. M. Yeoh, L. H. Poh, T. E. Tay, V. B. C. Tan
Summary: This paper presents a direct FE2 homogenisation model for shear-flexible beam elements based on the Timoshenko-Ehrenfest beam theory. The model uses an integral constraint involving the moments of axial displacement to impose an independent shear angle, enabling multiscale analysis in commercial FE codes.
COMPUTATIONAL MECHANICS
(2022)
Article
Engineering, Geological
Anna Maria Sklodowska, Caroline Holden, Philippe Gueguen, John Finnegan, Geoff Sidwell
Summary: Pulse-wave velocity and resonance frequency variations following earthquakes were analyzed through a building model, showing shifts even without reported structural damage. The cross-interpretation of these parameters reveals a time variant building response correlated with seismic loading, confirming efficient monitoring methods for seismic structural health.
BULLETIN OF EARTHQUAKE ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Xiaoyan Yang, Chaozhe Wang, Sheng Cao, Fengxi Wang, Wenbing Wu, Angelo Luongo, Yanlin Zhao, Yixian Wang, Hang Lin, Panpan Guo
Summary: This article systematically studies the lateral vibration of a helical pile embedded in a viscoelastic foundation. The helical pile is transformed into a cylindrical pile of special diameter using the equivalent stiffness method, and the lateral vibration model considering shear deformation is established based on the Winkler foundation model and the Timoshenko beam theory. The analytical solutions for the lateral dynamic displacement, bending moment, and shear force of the helical pile are derived, and the influence of pile and soil properties on the lateral dynamic response is investigated.
APPLIED SCIENCES-BASEL
(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)
