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
Bowen Yao, Yanni Zhang, Qinbo Zhou, Bin He, Guoping Wang, Xiaoting Rui
Summary: This paper investigates the vibration isolation of a beam with embedded graded reinforced double-leaf ABH structures. The results show that this design can improve both broadband low-frequency vibration isolation performance and the structural stiffness.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Muhammad Ayaz Akbar, Wai On Wong, Emiliano Rustighi
Summary: This research article presents a numerical approach to establish an optimal design methodology for a single-mass impact damper. The study finds that a single-mass impact damper designed with the optimal combination of design parameters can provide better vibration damping and relatively steady response. It outperforms the tuned mass damper in damping free vibrations of a single-degree-of-freedom primary structure. Although it cannot suppress forced vibration amplitude as effectively as a tuned mass damper at resonance, it has the advantages of lower cost and easier installation.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
E. De Bono, M. Morell, M. Collet, E. Gourdon, A. Ture Savadkoohi, M. Ouisse, C. H. Lamarque
Summary: This study presents a novel control algorithm for electroacoustic resonators, which transforms the linear acoustic response to nonlinear by changing the acoustical behavior of the device. The algorithm is tested and validated through numerical simulations and experimental tests, and it opens up the possibility of developing unconventional absorbers that can utilize nonlinear phenomena for noise attenuation.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Liyuan Li, Bin Li
Summary: This study proposes a new design scheme for eddy current dampers to achieve high energy dissipation efficiency in confined installation spaces. By establishing a simplified damping model and a mechanical-magnetic coupling finite element model, the nonlinearity of eddy current damping is effectively characterized and validated through experiments.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Karl-Alexander Hoppe, Kevin Josef Li, Bettina Chocholaty, Johannes D. Schmid, Simon Schmid, Kian Sepahvand, Steffen Marburg
Summary: This study expands the methods for non-destructively identifying material properties of a structure using modal data. It improves the results significantly by using eigenvectors instead of eigenvalues and accelerates the inversion process with a generalized polynomial chaos surrogate. A methodology for reusing surrogate models across inversion tasks is also developed.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Yue Xiang, Ping Tan, Hui He, Hongcan Yao, Xiaojun Zheng
Summary: This study extends the scope of structural control strategy by introducing a pendulum-tuned mass damper considering geometric nonlinear dampers. The proposed PTMD with GND effectively mitigates seismic response and outperforms inverted rough linear adjustment. The optimal design strategy efficiently suppresses structural vibration and adaptively utilizes the nonlinearity of the GND damping mechanism.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Vladimir Stojanovic, Jian Deng, Dunja Milic, Marko D. Petkovic
Summary: A comprehensive investigation was conducted to analyze the vibration stability of a coupled bogie system moving along a flexibly supported infinite high-order shear deformable coupled beam system on a viscoelastic base. The study compared the coupling of the bogie system with and without an additional stabilizer, finding significant benefits of dual coupling and additional stabilizers in terms of stability. The study also proposed unconventional models for technical practice and discovered the occurrence of motion instability with increased viscous damping in a special coupling. The paper introduced a novel technical solution for connecting moving objects at high speeds and extensively illustrated the benefits of an additional oscillator as a stabilizer through various examples. Using the D-decomposition technique and the argument principle, the study identified the region of instability within the parameter space of the system. The analysis revealed that the additional mechanical stabilizer allowed for a wider range of permissible suspension stiffness, while enabling transverse displacement in the couplings resulted in a stable regime of motion at lower suspension stiffness compared to other cases.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
P. Belardinelli, S. Lenci, F. Alijani
Summary: Through molecular dynamics simulations, this study explores the possibility of internal resonances in single-walled carbon nanotubes. The resonant condition is controlled by manipulating the symmetry in the boundary condition and increasing the energy exchange with a coupled thermal bath. The critical temperature threshold for initiating modal interaction is found to be dependent on the nanotube's chirality. By applying the proper orthogonal decomposition algorithm, the study demonstrates how thermal fluctuations influence the vibrational behavior of the nanotube, leading to both flexural-flexural and flexural-longitudinal resonances.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Hiroki Mori, Miwa Sueda, Kousuke Shiroshita, Takahiro Kondou
Summary: This paper investigates the self-synchronization of rotors in a nonlinear system and its application to vibratory machines. The stability of the self-synchronization is analyzed by examining the effects of the damping of the rigid body and the moment of inertia of the rotors. The findings show that it is possible to stabilize the instabilities while keeping other characteristics unchanged.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Weimin Wang, Jiale Wang, Qihang Li, Weibo Li, Wei Wang
Summary: This study investigates the vibration responses of a rotor-damper-casing coupling system during maneuvering flight. The flexible casing and squeeze film damper (SFD) are considered, and the results show that the rotor experiences deflection and the vibrations are influenced by the flexible casing. Harmonic and subharmonic components are observed in the rotor-damper-casing system vibrations.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Shuyuan Ye, Tianyu Peng, Zhili Long, Zhiming Jiang, Xiangqing Li, Zhonghua Cao
Summary: In this study, a novel approach based on beating vibration model is proposed for frequency tracking, which accurately determines the resonant frequency of the transducer in a short time.
Article
Acoustics
H. Franklin
Summary: This paper investigates the interaction between double porosity distributed cylindrical bodies and the surrounding fluid using a generalized self consistent method. The study reveals that there is a correlation between the propagating waves and the effective quantities at low frequencies, which is influenced by the volume fraction of scatterers and the porosity.
Article
Acoustics
Fei Shen, Fan Fan, Fengji Li, Li Wang, Rui Wang, Yue Wang, Tao Liu, Cuibai Wei, Haijun Niu
Summary: In this article, the authors propose a strategy using the coupling of the boundary integral equation method (BIEM) and the finite element method (FEM) to overcome the computational burden involved in compensating for aberrated ultrasound waves caused by the skull. They conducted simulation experiments to evaluate the effectiveness of the proposed method and found that it guarantees convergence and achieves more accurate transcranial focusing compared to noncorrected results. The proposed strategy is valuable for enabling online ultrasound simulations during treatment, facilitating real-time adjustments and interventions.
Article
Acoustics
Maxwell J. Kiernan, Rashid Al Mukaddim, Carol C. Mitchell, Jenna Maybock, Stephanie M. Wilbrand, Robert J. Dempsey, Tomy Varghese
Summary: In this study, a method for automatically determining bounding boxes and lumen segmentation using a Mask R-CNN network trained on sonographer assisted groundtruth carotid lumen segmentations is presented. This method is of great importance for analyzing ultrasound images that require time and labor, and it also lays the foundation for developing accurate plaque segmentation and wall thickness measurement methods.
Article
Acoustics
Junzhen Wang, Jianmin Qu
Summary: This article presents the solution to guided wave fields in a double-layer plate and proposes a nonlinear spring-interface model for the bonding between the two sublayers. The study finds that the nonlinearity of the spring-interface can generate resonant guided waves in the double-layer plate, providing a theoretical foundation for the development of nondestructive evaluation techniques using nonlinear guided waves.
Article
Acoustics
Zubeir M. Ebrahim Saib, Anthony J. Croxford, Bruce W. Drinkwater
Summary: This paper proposes a numerical model using FDTD scheme to solve the nonlinear elastic bulk wave equations, aiming to better understand nonlinear ultrasonic techniques. The model considers material and geometrical nonlinearities and uses a stress-type boundary condition for excitation. Simulation and experimental results validate the effectiveness of the model.
Article
Acoustics
Sol R. Martinez, Emmanuel Odella, Luis E. Ibarra, Arianna Sosa Lochedino, Ana B. Wendel, Andres M. Durantini, Carlos A. Chesta, Rodrigo E. Palacios
Summary: Sonodynamic inactivation (SDI) has an advantage over optical excitation-based protocols due to the deeper penetration of ultrasound (US) excitation. In this study, we applied conjugated polymer nanoparticles (CPNs) as an efficient sonosensitizer (SS) in SDI of pathogens and characterized the sonoreactor. We found that CPNs have a germicidal effect on planktonic cultures and mature biofilms, highlighting their potential for novel inactivation protocols.
Article
Acoustics
Quentin Baudis, Tony Valier-Brasier, Regis Wunenburger
Summary: In this study, we present a detailed procedure for measuring the rheological properties of soft, highly attenuating, visco-elastic materials at ultrasonic frequencies. We use a crosslinked Polyurethane (PU) elastomer as an example and determine its complex longitudinal modulus M and shear modulus G as a function of frequency and temperature. The results show that M, G, and bulk modulus K obey the time-temperature superposition principle and can be accurately described using a fractional derivative rheological model.
Article
Acoustics
F. R. Akhmedzhanov, M. I. Elboeva, S. Z. Mirzaev
Summary: The dependence of elastic and acousto-optic properties on the direction of wave vector and polarization of acoustic and optical waves in lead molybdate crystals has been investigated. Effective photoelastic constants were determined using the Dixon method for different geometries of Bragg light diffraction. The study of the acousto-optic quality factor dependence on the direction of the wave vector of longitudinal acoustic waves in the symmetry plane revealed that the maximum and minimum values are observed when light is diffracted by pure longitudinal waves in this plane. Additionally, it was found that the acousto-optic quality factor in lead molybdate crystals is practically the same as in paratellurite crystals.
