Article
Chemistry, Physical
Christin Zacharias, Carsten Koenke, Christian Guist
Summary: This paper presents a new approach for implementing thermoelastic damping into finite element simulations, achieving better agreement between simulation results and experimental data. The method calculates the generated heat within a vibration cycle and determines the temperature distribution based on mechanical eigenmodes. This algorithm leads to modal damping coefficients that can be used in subsequent analyses.
Article
Mechanics
M. Cinefra, M. C. Moruzzi, S. Bagassi, E. Zappino, E. Carrera
Summary: The vibro-acoustic problem of a plate made of an advanced material, like a composite one, backed to a fluid filled cavity is crucial for automotive and aerospace sectors. Prediction and mitigation of noise and vibrations enhance structural safety and passenger comfort. Developing reliable finite element models for vibro-acoustic analysis of structures made of advanced materials coupled with fluid filled cavities is the main aim. The study focuses on different plate layouts and fluid types in the cavity to consider weak and strong coupling interactions. Results are compared with commercial software like Actran (R) based on finite element method.
COMPOSITE STRUCTURES
(2021)
Article
Chemistry, Physical
Zhicheng Huang, Huanyou Peng, Xingguo Wang, Fulei Chu
Summary: The vibration control problem of thin plate structures is studied with the active constrained layer damping (ACLD) thin plate structure as the research object. An LQR controller is designed to actively control the ACLD sheet, effectively suppressing structural vibration by optimizing the control parameters and piezoelectric sheet parameters.
Article
Construction & Building Technology
Tingting Yang, Jian Kang
Summary: This study conducted sound field modeling of sequential spaces using a finite element model and investigated the effects of various factors on the sound field. The results showed that rooms with high absorption have higher average sound pressure levels, and the level difference between rooms decreases with larger opening dimensions. Additionally, the presence of an additional source and the distribution of absorption also significantly affect the sound field.
BUILDING AND ENVIRONMENT
(2022)
Article
Green & Sustainable Science & Technology
Xiaodong Jiao, Jin Tao, Hao Sun, Qinglin Sun
Summary: Acoustic manipulation technology has shown great potential in tissue and cell culturing, microchip processing, and material chemistry research. This paper proposes a method for analyzing the vibration force of a thin plate and conducts numerical analysis and experimental verification. It also achieves single particle motion control. The vibrating platform has the advantages of small size, good compatibility, and multipurpose.
Article
Engineering, Mechanical
A. G. de Miguel, M. Alvarez Blanco, E. Matas, H. Beriot, J. Cuenca, O. Atak, K. Janssens, B. Peeters
Summary: DFAX is a reliable and flexible method for acoustic qualification tests of spacecrafts. It reproduces the sound conditions of the space launch using high-powered loudspeakers and employs advanced control strategies to drive independent signals. Numerical models can be used to predict and optimize the test setup before on-site campaigns.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Chemistry, Physical
Zhicheng Huang, Jinbo Pan, Ziheng Yang, Xingguo Wang, Fulei Chu
Summary: The present study investigates the nonlinear vibration behavior of EVES beams using a FE model. The FE model shows better accuracy in predicting the natural frequency of sandwich beams, with the prediction accuracy of damping related to the thickness of each layer. The results provide important reference values for the design and optimization of viscoelastic sandwich structures.
Article
Materials Science, Multidisciplinary
Yong Gan, Hao Cai
Summary: Ultrafast laser-excited acoustic vibrations of single gold nanorods and nanospheres in water and vacuum were studied using simulations. It was found that the damping of gold nanorods' extensional vibrations in water is mainly caused by water dissipation. Both fluid damping and intrinsic dissipation contribute to the damping of gold nanorods and nanospheres' breathing mode in water, with more significant fluid damping effect. Simulations with different truncated tips of gold nanorods demonstrated that the damping of nanorods' breathing mode is sensitive to the sizes of truncated rod tips.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Min-Jung Sim, Chinsuk Hong, Weui-Bong Jeong
Summary: In this study, an equivalent circuit-based model of transducer arrays with flexible surrounding structures was developed for effective analysis. The proposed method accurately and efficiently evaluated the acoustic performance and response of transducers. This method is expected to be useful for conceptual design.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Marine
Ming-Song Zou, Huai-Cheng Tang, Shu-Xiao Liu
Summary: Damping materials are widely used to reduce vibration and noise in ships and underwater vehicles. This paper introduces a method to calculate the vibration and acoustic radiation from locally damped cylindrical shells immersed in water. Two types of vibration and noise reduction measures are analyzed, providing reference for the development of damping technology in ships and underwater vehicles.
Article
Polymer Science
Pawel Dunaj
Summary: This paper presents a method based on mesoscale finite element modeling and substructural identification for predicting the dynamic properties of polymer concrete. By decoupling the model and updating the dynamic properties of substructures, parameters of different substructures can be determined, and the damping effect of the interfacial transition zone can be understood.
Article
Acoustics
Zhongkun Jin, Yan Gao, Xianjun Wu, Jun Yang
Summary: The paper discusses the importance of the interaction between the sound field outside an elastic structure and its boundary in acoustics. It introduces the global acoustic impedance for analyzing elastic structures and highlights its advantage over local acoustic impedance in providing physical insights into the sound field. The study also involves solving the impedance matrix of an elastic spherical shell and investigating acoustic scattering using the acoustic boundary element method, offering explanations for the differences between global and local acoustic impedance calculations in acoustic scatterings.
JOURNAL OF THEORETICAL AND COMPUTATIONAL ACOUSTICS
(2021)
Article
Construction & Building Technology
Lei Xu
Summary: In order to evaluate the ground vibration caused by metro tunnel operations, it is necessary to extend the near-field vibration of train-track-tunnel to the far-field vibration of train-track-tunnel-soil through numerical analysis. This study proposes an isoparametric element permutation method that integrates triangular prismatic elements and spatial isoperimetric elements to model the tunnel-soil system effectively. The tunnel and soil subsystems are coupled using spring-dashpot elements. The effectiveness of this model is validated through comparison with measurements on site.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Computer Science, Interdisciplinary Applications
Bi Wu, Weichun Fan, Zhongming Xu, Zhifei Zhang, Guanghu Jin
Summary: A topology optimization method for coupled vibro-acoustic problem based on hybrid finite element-wave based method is proposed. The method uses solid isotropic microstructures with penalization method to optimize the layout of free layer damping in order to minimize sound pressure in the acoustic cavity. Numerical examples and experimental results demonstrate the effectiveness, accuracy, and efficiency of the proposed method compared to conventional methods.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2021)
Article
Acoustics
Xi Zhang, Hongguang Li, Xie Zhao, Chunyue Liu, Qu Liu, Hanlin Xiong, Guang Meng
Summary: This study adopts the acoustic finite element method (FEM) and acoustic boundary element method (BEM) coupling method to model, calculate, and analyze the three-dimensional model of a segmented ring transducer, in order to overcome the shortcomings of traditional FEM and direct coupling methods. The results indicate that the proposed method is correct and effective, and can be used to comprehensively calculate the acoustic characteristics of the segmented ring transducer.
Article
Acoustics
Ju Hyuk Park, Kyung Suh Minn, Hyeong Rae Lee, Sei Hyun Yang, Cheng Bin Yu, Seong Yeol Pak, Chi Sung Oh, Young Seok Song, Yeon June Kang, Jae Ryoun Youn
JOURNAL OF SOUND AND VIBRATION
(2017)
Article
Instruments & Instrumentation
Ju Hyuk Park, Hansu Kim, Jae Ryoun Youn, Young Seok Song
SMART MATERIALS AND STRUCTURES
(2017)
Article
Materials Science, Multidisciplinary
Juhyuk Park, Sei Hyun Yang, Kyung Suh Minn, Cheng Bin Yu, Seong Yeol Pak, Young Seok Song, Jae Ryoun Youn
MATERIALS & DESIGN
(2018)
Article
Dermatology
Ju Hyuk Park, Young Her, Bo Mi Chun, Chul Woo Kim, Sang Seok Kim
ANNALS OF DERMATOLOGY
(2009)
Article
Biochemical Research Methods
Sei Hyun Yang, Juhyuk Park, Jae Ryoun Youn, Young Seok Song
Article
Materials Science, Multidisciplinary
Juhyuk Park, Hyung Min Kim, Jae Ryoun Youn, Young Seok Song
ADVANCED MATERIALS TECHNOLOGIES
(2019)
Article
Polymer Science
Hyung Min Kim, Juhyuk Park, Zheng Min Huang, Jae Ryoun Youn, Young Seok Song
MACROMOLECULAR RESEARCH
(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)
