Article
Acoustics
Feng Xiao, Haiquan Liu, Jia Lu
Summary: Diagnostic methods for cardiovascular disease based on heart sound classification have been widely studied due to their noninvasiveness, low-cost, and high efficiency. However, existing research often faces challenges such as the nonstationarity and complexity of heart sound signals, leading to limited capability of neural networks to extract discriminative features. To address these issues, this study proposes a novel convolutional neural network that combines 1D convolution and 2D convolution, and introduces an attention mechanism to enhance feature extraction capability. The study also explores the advantages and disadvantages of combining deep learning features with manual features, and adopts an evolving fuzzy system for decision-making interpretability.
Article
Acoustics
Cailiang Zhang, Zhihui Lai, Zhisheng Tu, Hanqiu Liu, Yong Chen, Ronghua Zhu
Summary: This paper proposes two single-parameter-adjusting SR models to optimize the output performance of SR systems. The effects of the proposed models on SR output under different parameters and signals are investigated through numerical simulations, and their feasibility is verified through experimental results. The research results are of great significance for guiding the design of tri-stable SR models and the application of SR-based signal processing in the context of big data.
Article
Acoustics
Shaoqiong Yang, Hao Chang, Yanhui Wang, Ming Yang, Tongshuai Sun
Summary: In this study, a suspension system based on phononic crystals is designed for vibration isolation of acoustic loads in underwater gliders. The vibration properties of the phononic crystals and the effects of physical parameters on the underwater attenuation zones are investigated. Vibration tests show that the phononic crystal suspension system has a stable vibration isolation effect in the frequency range of 120-5000 Hz.
Article
Acoustics
Xuebin Zhang, Jun Zhang, Tao Liu, Ning Hu
Summary: This study proposes a tunable metamaterial beam to isolate flexural waves. A genetic algorithm-based size optimization is used to obtain a broad low-frequency bandgap. The tunability of the beam is achieved by attaching different numbers of permanent magnets to change the mass of the resonators. Additionally, ultra-broadband flexural wave attenuation is achieved by forming a gradient metamaterial beam based on the rainbow effect. Numerical and experimental results confirm the good flexural wave attenuation ability of the proposed beam.
Article
Acoustics
Luca Rapino, Francesco Ripamonti, Samanta Dallasta, Simone Baro, Roberto Corradi
Summary: This paper presents a method for simulating tyre/road noise using equivalent monopoles, including the synthesis of monopoles through an inverse problem approach and the use of an ISO 10844 road replica for laboratory testing. The method combines acoustic finite element models and numerical simulations of vehicles, and the results are validated by comparing them with measured data.
Article
Acoustics
Lars Radtke, Paul Marter, Fabian Duvigneau, Sascha Eisentraeger, Daniel Juhre, Alexander Duester
Summary: The numerical investigation of acoustic damping materials is valuable for experimental testing. Fully resolved models are necessary for detailed insight into the acoustic behavior. The finite cell method can enhance the modeling process by combining the fictitious domain approach with high-order finite elements. It can also accurately consider fluid-filled pores in damping materials.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Joshua R. Tempelman, Alexander F. Vakakis, Kathryn H. Matlack
Summary: In this work, the researchers demonstrate the interpretation of propagating topological waves in valley Hall lattices using the linear degenerate modal basis. They show that a small subset of closely spaced modes make up the topological waves, allowing for the construction of analytical reduced-order models. This is possible due to the sparse density of the modal spectrum inside the topological band gap. The researchers utilize this result to refine group velocity predictions of propagating topological waves by matching the modal spectrum to the supercell dispersion diagram. They also use the damped modal spectrum to characterize variations in wave group velocity in damped topological lattices and predict edge-to-bulk transitions. This work establishes a framework for accurately characterizing undamped and damped topological wave propagation using classical dynamics.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Si-Yu Gao, Xiao-Ye Mao, Zheng-Bo Luo, Jue-Wu Xu, Hu Ding, Li-Qun Chen
Summary: This paper focuses on the qualitative characteristics of parametric resonance of pipes conveying fluid in thermal environment, and compares the differences between subcritical and supercritical regions. By using a direct multi-scale method, the approximate analytical solution of parametric resonance is obtained and verified to be reliable. The study also investigates the stability bounds of the parameters inducing parametric resonance, and finds that temperature increment, viscous damping, average velocity and pulsation velocity all have an influence on the resonance characteristics.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Daiheng Shen, Ye Lu, Linxin Hua, Zhoufeng Shi
Summary: This research aims to fill the gap in quantifying interfacial debonding in adhesively bonded tiling systems. It proposes a more efficient quantification method by investigating the vibration responses of tile panels, reducing testing points required and extending the capability to smaller debonding sizes.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Ge Yan, Wen-Hao Qi, Jia-Jia Lu, Feng-Rui Liu, Han Yan, Lin-Chuan Zhao, Zhi-Yuan Wu, Wen-Ming Zhang
Summary: Inspired by the collaborative action of ankle, knee and hip joint, a novel bio-inspired multi joint structure (BIMJS) is proposed for low frequency vibration isolation. The concept of quasi zero stiffness (QZS) is introduced and the effects of posture adjustment and joint stiffness on the isolation performance are investigated. Experimental results show that the BIMJS can effectively isolate vibrations above 2.5 Hz under multiple loads.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Xingjian Dong, Yifan Huangfu, Xiaoluo Yu, Kangkang Chen, Zhanwei Li, Zhike Peng
Summary: The article introduces the three primary sources of internal excitation in gear systems and proposes a mediator algorithm to identify the error excitation. By utilizing signal processing and iterative optimization, the algorithm achieves optimal matching between simulation and experiment. Additionally, it proposes a pre-decomposition technique to accelerate the solution of the simulation dynamic model, and the performance of the algorithm is verified numerically and experimentally, showing robustness to noise, damping, and phase differences.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Stephen Elliott, Mihai Orita, Erika Quaranta, Jordan Cheer
Summary: This study investigates the scattering of sound by a thin spherical shell using an analytic formulation involving spherical harmonics. The scattered power, defined as the integral of the far field scattered intensity, can be expressed in a simple form. By choosing appropriate material properties and shell thickness, the scattered power can be minimized at low frequencies. Feedback control using structural actuators and sensors is considered to suppress the scattering caused by the shell's resonance frequencies.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Kenny F. Conto, Robert Arcos, Arnau Clot, Evangelos Ntotsios, Hassan Liravi, Aires Colaco, David J. Thompson
Summary: An efficient three-dimensional method is proposed to solve pile-soil interaction problems, which models the soil as an elastic half-space and employs the singular boundary method to compute its response. The method also accounts for the rotational motion and reaction torque of the rigid segments of the pile and provides computational advantages over traditional methods while overcoming their limitations.
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
Hyewon Yoo, Jae Woong Bae, Jae-Hak Jeong, Yong-Hwa Park
Summary: A new biometric recognition method using the vibration responses of human fingers for personal identification is proposed. Experimental analyses were conducted to measure the frequency response functions of individuals' fingers and a biodynamic lumped system model was constructed. The most effective set of frequency bins were extracted and utilized with a support vector machine for classification. The results showed a maximum accuracy of 99%, confirming the feasibility of using this method for person recognition.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
An Li, Yuusuke Kobayashi, Yushin Hara, Keisuke Otsuka, Kanjuro Makihara
Summary: This paper proposes a new semi-active vibration suppression method using a magnetostrictive transducer for MDOF flexible structures. Numerical simulations and experimental validations show that the proposed method is more effective than conventional methods in suppressing vibration.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Lin Geng, Xing-Guo Chen, Shu-Ping He, Chun-Dong He
Summary: This paper proposes a sparse real-time near-field acoustic holography method for the precise and stable reconstruction of a transient sound field. By establishing a convolution equation and applying an optimization algorithm, the pressure time-wavenumber spectrum of the reconstruction plane is obtained. Numerical simulation results demonstrate the reconstruction capacity of the proposed method and its superiority compared to other methods.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Yanfei Zuo, Jin Li, Kun Feng, Zhinong Jiang
Summary: The asymmetry of rotor systems, as well as the coupling vibration problem between rotor and support structure due to the light weight of aero-engines, require a design and analysis method for the dynamic characteristics of time-varying rotor-support systems with detailed structure. This article proposes a modeling method using 3-D finite element to simulate the time-varying rotor-support system based on rotating-fixed coordinates. The force, energy, and displacement between rotor and support structure are transmitted by bearing mechanical parameters, and the explicit expression of the system's time-varying characteristics is obtained. Floquet theory and Hill infinite determinant method are then used to analyze the quasi-mode frequency characteristics and stability of the system.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Simon Schmid, Carmen Hachmann, Christian Boehm, Lion Krischer, Alexander Mendler, Jochen Kollofrath, Christian U. Grosse
Summary: This study introduces a novel method using wavefield simulation and full-waveform inversion to estimate dynamic material parameters. The method only requires one measurement and provides a more accurate determination of wave velocity. By employing high-fidelity ultrasound simulations and a suitable cost function, the inverse problem was successfully solved.
Review
Acoustics
Ahmed M. Al-Jumaily, Hassan Liaquat, Sharad Paul
Summary: This article presents a comprehensive review on the effect of various operational parameters of focused ultrasound (FUS) on the injury zone produced by ultrasound beams for different dermatological applications. The article highlights the efficient operational parameters of FUS to enhance pain relief during surgery and make skin treatment more affordable. Additionally, a prospective future technique for efficient FUS is discussed.
ULTRASOUND IN MEDICINE AND BIOLOGY
(2024)
