Article
Materials Science, Multidisciplinary
Shuai Yang, Mincai Jia
Summary: This study proposes an analytical layer-element-boundary-element coupling approach to investigate the isolation effect of pile rows in stratified transverse isotropic saturated media for moving-load-induced vibration. With the derived analytical layer-element basic solution for the soils, the soil flexibility matrices are obtained using boundary integral equations for pile-soil interaction. The piles are modeled as Bernoulli-Euler beams using the finite difference approach, and their dynamic equations are determined based on the pile-soil displacement coordination condition. The obtained results show good consistency with existing solutions, and numerical examples are used to evaluate the impacts of various factors on the isolation effect, including the soils' transverse isotropy, the pile's size, and physical properties.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Geological
Shuai Yang, Mincai Jia
Summary: This paper proposes an analytical layer element-boundary element coupling method to study the vibration isolation effect of pile rows in multi-layered isotropic saturated soils subjected to a moving harmonic load. The method uses an analytical layer-element solution to represent the isotropic saturated soil, and applies the pile-soil boundary integral equation to obtain the soil flexibility matrices. The piles are modeled as Bernoulli-Euler beams using the finite difference method. The paper considers the coordination condition of pile-soil displacement to obtain the dynamic response equations of the pile rows under a harmonic moving load.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Lingkai Meng, Zhibao Cheng, Zhifei Shi
Summary: The paper investigates the vibration isolation performance of periodic pile barriers under moving loads and proposes a novel method for deriving the attenuation zones of periodic pile barriers under harmonic moving loads for waves propagating in different directions. A simplified numerical model is developed to analyze the dynamic responses of the barriers in frequency domain and time domain, validating the theoretical predictions. The study reveals that the filtering property of periodic pile barriers under moving loads is related to dispersion properties along each possible wave-propagation direction.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Engineering, Civil
Zhihui Liu, Junchuan Niu, Ruihao Jia, Juncai Guo
Summary: This study presents an efficient numerical method to address the issue of moving loads on triangular and quadrilateral plates. The domain decomposition and penalty function methods are utilized to handle general polygonal plates and arbitrary boundary conditions. Through mathematical modeling and dynamic equations, the elastic deflection and dynamic response of the plates are accurately described.
THIN-WALLED STRUCTURES
(2021)
Article
Engineering, Geological
Hongzhen Wang, Chunsheng Zhang, Jianqun Jiang, Wei Huang, Dechang Guo, Tao Sheng
Summary: The study conducted a field test and established a coupling model to analyze the characteristics of ground vibrations caused by moving vehicle loads and the effectiveness of vibration isolation measures. The results showed that in the sensitive area, the ground vibrations caused by the vehicle loads were mainly low-frequency vertical vibrations, while the horizontal vibrations attenuated much faster. Factors such as pile spacing, pile length, and barrier width had a significant impact on the effectiveness of vibration isolation using piles. With an optimized isolation plan, the vibrations caused by moving vehicle loads in the sensitive area could be reduced by about 30-50%.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2022)
Article
Engineering, Mechanical
Sara Ying Zhang, Xi Sheng, Jason Zheng Jiang, Haijun Zhou, Wei-Xin Ren, Zi-Hang Zhang
Summary: This paper presents the possibility of suppressing train-induced vibration on bridges using a linear passive vibration suppression device incorporating inerter. Numerical studies on two bridges under three types of railway excitations show that the proposed inerter-based configuration can improve the overall performance of the bridge. The practical installation feasibility and robustness of the absorber are also verified through sensitivity analysis.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Computer Science, Interdisciplinary Applications
Xiaobin Chen, Yeshun Wang, Fei Meng, Kang Xie, Liqin Yi, Yun Zheng
Summary: This paper presents a numerical method to obtain the complex band diagram of a three-dimensional model with periodic underground surface wave barriers. The circular concrete pile was studied using this method, and several evanescent modes with non-zero imaginary parts were observed, which can quantitively measure the attenuation of vibrations. A transmission model with semicircle boundary was established to calculate transmission spectra and investigate the direction of reflected vibration energy. The influence of pile length and number of rows on the isolation effect were studied. Both the evanescent modes and the existence of leaky surface waves (LSWs) contribute to surface wave mitigation.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Mathematics
W. Abbas, Omar K. Bakr, M. M. Nassar, Mostafa A. M. Abdeen, M. Shabrawy
Summary: The research focuses on vibration analysis of Euler-Bernoulli and Timoshenko beams using the differential quadrature method, comparing the influence of different cross-sectional areas on vibration and obtaining results consistent with previous studies.
JOURNAL OF MATHEMATICS
(2021)
Article
Mechanics
D. Stancioiu, H. Ouyang, J. Yang
Summary: This paper introduces and validates a new approach to designing an active controller for a small-scale experimental structure subjected to multiple moving loads. The study shows that using linear or cubic displacement feedback control can significantly reduce vibration amplitudes. The controller can tolerate speed variations, but compensation is needed to increase stability margins of the controlled system.
ARCHIVE OF APPLIED MECHANICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Zongqin Wang, Yunpeng Zhang, Wenbing Wu, Guoxiong Mei
Summary: The paper proposes a semi-numerical approach to estimate the dissipation of excess pore water pressure and the development of negative skin friction at the normal impervious pile and the permeable pile after piling. An impeded drainage boundary is introduced to simulate the drainage condition at the soil-permeable pile interface. Through comparisons with field tests, model tests, and theoretical answers, the correctness and rationality of the proposed method are validated. Important design parameters of the permeable pile are also investigated.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Engineering, Mechanical
Javier Perez Espinoza, Jorge Palomino Tamayo
Summary: This paper introduces a finite element-based model for the parametric analysis of pile groups in homogeneous sand deposits. The model considers different configurations and parameters such as cap elevation, scour depth, soil layering, and pile material. After calibration, the model is used to study the effect of these parameters on lateral resistance and displacement. The results show that cap elevation, scour depth, and pile material significantly affect the system's lateral resistance and displacement.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Selcuk Bildik, Haluk Tanriover
Summary: This study verified a centrifuge experiment with a finite element program and investigated the effects of various parameters on kinematic interaction in pile foundation design. The results indicated that earthquake magnitude is the most important parameter in kinematic interaction analyses.
APPLIED SCIENCES-BASEL
(2023)
Article
Construction & Building Technology
Lingkai Meng, Zhifei Shi, Shengwang Hao, Zhibao Cheng
Summary: The filtering properties of a 2D periodic in-filled trench barrier system subjected to anti-plane and in-plane moving loads are investigated using the spatial Fourier transform and periodic structure theory. The dispersion equations for anti-plane and in-plane wave are obtained using the closed-form solution and the State-Space-Transfer-Matrix-Method (SSTMM), respectively. The vibration isolation regions of the barrier can be determined by comparing the attenuation zones (AZs) with the load-speed-line cluster.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Marine
Yu-ji Miao, Xu-jun Chen, Yong-lin Ye, Jun Ding, Heng Huang
Summary: This paper presents a numerical simulation method for calculating the dynamic properties of a floating bridge under various loads, and analyzes the vertical displacements of the pontoons under different conditions. The results show that the vertical displacements caused by heavy moving loads are significantly larger than those caused by environmental loads. Useful conclusions have been drawn to provide references for the analysis and design of pontoon-type floating bridges.
Article
Engineering, Geological
Sonal Singh, Nihar Ranjan Patra
Summary: This study conducted free and forced vibration analyses of tapered piles under axial harmonic loads. The natural frequency of the soil-pile system was obtained and validated using analytical methods and field test results. The forced vibration analysis was carried out using the Euler-Lagrange equation, with numerical results validated against full-scale forced vibration tests of cylindrical piles. The study discussed the effects of various factors on the response characteristics of tapered piles.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2021)
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)