Results 41 to 50 of about 299,182 (254)
Experimental and numerical study of rotor aeroacoustics [PDF]
, 2017 The work documents recent experiments at the Kazan National Research Technical University named after A.N. Tupolev (Kazan Aviation Institute), related to helicopter acoustics. The objective is to measure nar-field acoustics of rotors in hover and provide
Barakos, George N. +7 more
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An acoustic metamaterial lens for acoustic point-to-point communication in air [PDF]
Acoustical Physics 65 (2019): 1-6, 2017 Acoustic metamaterials have become a novel and effective way to control sound waves and design acoustic devices. In this study, we design a 3D acoustic metamaterial lens (AML) to achieve point-to-point acoustic communication in air: any acoustic source (i.e. a speaker) in air enclosed by such an AML can produce an acoustic image where the acoustic wave
arxiv +1 more source
Multi Spherical Wave Imaging Method Based on Ultrasonic Array
Sensors, 2022 The imaging range of traditional plane wave imaging is usually limited by the directivity of the plane wave. In this paper, a multi spherical wave imaging method based on an ultrasonic array is proposed, which radiates both compression and shear waves in
Zhi-Ying Liu +3 more
doaj +1 more source
, 2012 The International Symposia on Nonlinear Acoustics, now referred to as ISNA, have convened regularly since 1968, bringing together scientists and engineers to report and discuss the latest developments in this branch of nonlinear physics.
Blackstock, D. T. +2 more
core +1 more source
Simultaneous realization of slow and fast acoustic waves using a fractal structure of Koch curve
Scientific Reports, 2018 An acoustic metamaterial based on a fractal structure, the Koch curve, is designed to simultaneously realize slow and fast acoustic waves. Owing to the multiple transmitting paths in the structure resembling the Koch curve, the acoustic waves travelling ...
Jin Ding +4 more
doaj +1 more source
The Journal of Engineering, 2019 Space-time adaptive detection (STAD) is an important research aspect of the bistatic multiple-input multiple-output (MIMO) radar system. The signal and clutter space-time models of the bistatic MIMO radar are described in this study. The knowledge-aided (
Sheng Yan, Chengpeng Hao, Da Xu, Bo Shi
doaj +1 more source
Numerical simulation of the radiation force from transient acoustic fields: Application to laser-guided acoustic tweezers [PDF]
arXiv, 2023 Using pulsed acoustic waves could provide a superior selectivity for microscale acoustic tweezers. However, the theory for the radiation force of pulsed acoustic waves has only been recently derived and no numerical implementations are available. In this paper, we present a finite-element implementation of this model to simulate the transient acoustic ...
arxiv
Sensors, 2020 With the development of ocean exploration technology and the rapid growth in the amount of marine science observation data, people are faced with a great challenge to identify valuable data from the massive ocean observation data. A recommendation system
Xiaoyang Song +6 more
doaj +1 more source
Applied Sciences, 2023 In this study, we propose a fast calculation method that utilizes Kirchhoff’s hypotheses and electroelasticity theory to derive the resonant frequency, antiresonant frequency, and effective electromechanical coupling coefficient of a trilaminar bending ...
Chenhui Zhu +4 more
doaj +1 more source