Results 21 to 30 of about 34,890 (263)
Energies, 2020 This study computationally evaluates the effect of loudspeakers on the in situ electric field in a driver body model exposed to the magnetic field from a wireless power transfer (WPT) system in an electric vehicle (EV), one with a body made of carbon ...
Junqing Lan, Akimasa Hirata
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Nature Communications, 2017 Ferroelectret nanogenerators were recently introduced as a promising alternative technology for harvesting kinetic energy. Here we report the device’s intrinsic properties that allow for the bidirectional conversion of energy between electrical and ...
Wei Li +7 more
semanticscholar +1 more source
Time-Domain Sound Field Reproduction with Pressure and Particle Velocity Jointly Controlled
Applied Sciences, 2021 Particle velocity has been introduced to improve the performance of spatial sound field reproduction systems with an irregular loudspeaker array setup. However, existing systems have only been developed in the frequency domain. In this work, we propose a
Xuanqi Hu +3 more
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PID-like active control strategy for electroacoustic resonators to design tunable single-degree-of-freedom sound absorbers [PDF]
, 2021 Sound absorption at low frequencies still remains a challenge in both scientific research and engineering practice. Natural porous materials are ineffective in this frequency range, as well as acoustic resonators which present too narrow bandwidth of absorption, thus requiring alternative solutions based on active absorption techniques.
arxiv +1 more source
IEEE Transactions on Magnetics, 2007 We note the drawbacks of classical loudspeaker motors: the inductance varies with the coil's position, there is a reluctant effect and Eddy currents appear because of the iron in the motor. We then present ironless structures of loudspeaker motors to eliminate these drawbacks.
openaire +2 more sources
Study of Standing-Wave Thermoacoustic Electricity Generators for Low-Power Applications
Applied Sciences, 2018 This paper is concerned with the study of low-cost, low-power thermoacoustic electricity generators. Based on target electrical output power values of 50 and 100 W, three standing wave prototypes (of both one-stage and two-stage prototypes) integrating a
Antonio Piccolo
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Frontiers in Digital Health, 2021 The distortion-product otoacoustic emission (DPOAE) is a backward propagating wave generated inside the cochlea during the wave amplification process. The DPOAE signal can be detected rapidly under relatively noisy conditions.
Wei-Chen Hsiao +2 more
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Three-dimensional wave-domain acoustic contrast control using a circular loudspeaker array.
Journal of the Acoustical Society of America, 2019 This paper proposes a three-dimensional wave-domain acoustic contrast control method to reproduce a multizone sound field using a circular loudspeaker array.
Zerui Han, Ming Wu, Qiaoxi Zhu, Jun Yang
semanticscholar +1 more source
Nihon Kikai Gakkai ronbunshu, 2015 We herein propose a new model-based control method, in place of traditional adaptive control, for a low-frequency noise problem in a closed space. The proposed control method is based on state feedback control and a model of the acoustic space obtained ...
Shotaro HISANO +3 more
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Acta Acustica, 2020 Introduction: Surrounding spherical loudspeaker arrays facilitate the application of various spatial audio reproduction methods and can be used for a broad range of acoustic measurements and perceptual evaluations.
Pausch Florian +2 more
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