Article
Acoustics
Silouane de Reboul, Emmanuel Perrey-Debain, Nicolas Zerbib, Stephane Moreau
Summary: This paper presents a frequency domain numerical method for solving the propagation of sound waves in a three-dimensional domain with rotating obstacles. The method uses domain decomposition to embed rotating parts in a cylindrically-shaped domain and employs Frequency Scattering Boundary Conditions to achieve transmission conditions between fixed and rotating domains.
JOURNAL OF SOUND AND VIBRATION
(2024)
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
Hector E. Goicoechea, Roberta Lima, Fernando S. Buezas, Rubens Sampaio
Summary: In this paper, a comprehensive continuous Cosserat rod model is developed to study the dynamics of a drill-string. The model can simulate the 3-D dynamics of the system, including lateral, axial and torsional motion, and includes damping effects and a velocity-independent bit-rock interaction formulation. The study compares the model's predictions with two other models and finds divergences in the signals obtained with the Cosserat model, indicating that the new continuous approach can capture aspects of the dynamics that cannot be modeled with low-dimensional representations. The study also evaluates the drilling efficiency and finds that axial oscillations have a positive effect on drilling performance, while torsional stick-slip has a negative effect.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Junzeng He, Dong Jiang, Dahai Zhang, Zhenhuan Tang, Qingguo Fei
Summary: An adaptive Gaussian process model-based model updating method for rotor system is proposed in this study, which utilizes unbalance responses data and multi-channel data fusion to construct the objective function of model updating, effectively reducing the computation cost of repeated finite element calculation. Experimental results show that the proposed method has good accuracy and feasibility.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Ju-Hyok Kim, Jong-Hyok Ri, Hyok Jang, Chol-Ung Choe
Summary: This article introduces the centrifugal pendulum vibration absorber and the significant role of geometric nonlinear damping in reducing torsional vibrations in machines. The research findings suggest that geometric nonlinear damping can effectively eliminate multistability and hysteresis in steady states.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Zaiwei Liu, Bin Lin, Xiaohu Liang, Xiaokang Ma, Yangfan Wan
Summary: This paper presents a combined semi-analytical finite element (SAFE) and perfectly matched layer method for accurately predicting the dispersion, attenuation, and polarization modes of surface acoustic waves (SAWs) in materials. The method is validated by comparing the simulated results with exact three-dimensional elasticity theory-based solutions, and the effects of material anisotropy and residual stress on SAWs are discussed. The method is also applied to practical examples and the differences and similarities of two common acoustoelastic theories are discussed.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Yuqi Li, Tianliang Long, Zhong Luo, Chuanmei Wen, Zhimin Zhu, Long Jin, Bing Li
Summary: This study aims to investigate the dynamic and mechanical behaviors of a bolted joint rotor-bearing system affected by pedestal looseness fault. By establishing a dynamic model and conducting experimental research, the dynamic features of pedestal looseness fault are identified.
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)
Article
Acoustics
Panxu Sun, Yadan Yan, Hong Yang
Summary: This paper proposes a complex mode superposition method based on the hysteretic damping model, which can effectively consider the non-proportional damping characteristics of hybrid structures. The method is suitable for calculating the time-domain dynamic responses of hybrid structures that are sensitive to frequency variation and have strong non-proportional damping characteristics.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Sonya Tiomkin, Justin W. Jaworski
Summary: This paper presents an analytic solution for the aerodynamic noise generated by a traveling wavepacket passing near the edge of a rigid semi-infinite flat plate. The solution is derived in the time domain for a wavepacket of either constant or spatially-varying wavenumber, and novel expressions are obtained for the incident and scattered sound fields. The study shows that the wavenumber modification has a significant effect on the incident field but not on the scattered field amplitude, while the phase difference between the incident and scattered fields depends strongly on the spatial variation in the wavepacket wavenumber.
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
Jinhong Noh, Pilkee Kim, Yong-Jin Yoon
Summary: This study reveals the competitive advantages of a bistable vibration isolator over conventional linear and monostable ones, including a wider vibration isolation bandwidth and enhanced operational safety.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Dong Shao, Yilun Zhang, Yongqiang Tao, Yonghui Zhao, Yuan Cao
Summary: This paper presents a semi-analytical method and experiments to investigate the free vibration characteristics of closed-coupled plates with arbitrary spatial coupling angles and curved edges. By combining different boundary and spatial coupling connection conditions, semi-analytical solution formulas for the entire vibration model are established. The accuracy and applicability of the method are verified through experimental tests, comparisons with other research results, and finite element method simulations. Furthermore, the effects of spatial geometric parameters on the free vibration characteristics of closed-coupled plates with curved edges are thoroughly studied.
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
Jialin Su, Hongwei Chen, Dong Yang
Summary: This paper investigates the acoustic inertia of inclined circular apertures in a finite-thickness plate. A hybrid method combining modal expansion and boundary element method is used for calculation and analysis. The results obtained from simulations of different inclination angles and arrangement patterns provide representative findings. The effectiveness of the proposed method is verified through validation experiments and comparison with Computational Fluid Dynamics simulations.
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
Wai Yeen Yeang, Dunant Halim, Xiaosu Yi, Hao Chen
Summary: This study aims to broaden the absorption bandwidth and improve low frequency sound absorption of a microperforated panel (MPP) by investigating the effects of tuned multi-frequency resonators attached to a flexible panel. The research shows that the placement, quantity, and configuration of the resonators significantly influence the sound absorption characteristics. Circular arrangement of multiresonators helps achieve a more uniform sound absorption coefficient. Experimental results demonstrate that using circularly-arranged multi-frequency resonators with a 2% mass ratio as the backing can achieve wide low-frequency half-bandwidth and improved absorption coefficient.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Ce Zhang, Wei Ma
Summary: This paper firstly derived a frequency-domain expression of sound pressure field radiated by monopole source with general moving trajectory, and verified its accuracy through theoretical and numerical verification. This expression can be applied to localize a rotating source with time-variant rotation speed using the mode composition beamforming method.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Wojciech P. Rdzanek, Augustus J. E. M. Janssen, Krzysztof Szemela, Marek Pawelczyk
Summary: This study rigorously addresses the Neumann-Robin problem of sound radiation from a vibrating flexible disk embedded into a hemispherical enclosure. The presented solution is applicable to any vibration velocity profile on the radiator, and the results can be valuable for modeling vibroacoustic responses of various speakers, sensors, and microphones.
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)
