Results 31 to 40 of about 9,271 (162)
A Thickness-Mode High-Frequency Underwater Acoustic Transducer with a Low Sidelobe Level
Actuators, 2021 Thickness vibration mode is commonly used for high-frequency transducers. For disc piezoelectric ceramics, there is no ideally pure thickness vibration mode because the coupling between the radial and thickness modes always exists.
Hui Zhao +5 more
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Adaptive Underwater Acoustic Communications [PDF]
, 2010 Underwater wireless networks consist of mobile and static nodes, which usually communicate using the acoustic channel since radio transmissions attenuate rapidly and optical communication is only suitable for short distances. The underwater acoustic channel is plagued with issues of high transmission power requirements, rapidly changing channel ...
Anuj Sehgal, Jürgen Schönwälder
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Applied Sciences, 2023 In order to design a low-noise water-filled pipeline system, it is necessary to obtain knowledge of the dispersion characteristics of axial propagation modes in different water-filled elastic tubes.
Zirong Gao +3 more
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Shock and Vibration, 2020 Compared with scalar sound field, vector sound field explained the spatial structure of sound field better since it not only presents the sound energy distribution but also describes the sound energy flow characteristics.
Wenbo Wang, Desen Yang, Jie Shi
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Remote SensingFor a multi-hydrophone synthetic aperture sonar (SAS), the instability of the platform and underwater turbulence easily lead to two-dimensional (2-D) space-variant (SV) motion errors.
Haoran Wu +5 more
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AIP Advances, 2017 Active piezoelectric materials are applied to one-dimensional phononic crystals, for the control of longitudinal vibration propagation both in active and passive modes. Based on the electromechanical coupling between the acoustical vibration and electric
Qicheng Zhang +3 more
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Reinforcement Learning-Based Adaptive Modulation and Coding for Efficient Underwater Communications
IEEE Access, 2019 In this paper, we propose a reinforcement learning-based adaptive modulation and coding scheme for underwater communications; more specifically, based on the network states such as the quality of service requirement of the sensing message, the previous ...
Wei Su +4 more
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Journal of Marine Science and EngineeringTo address the performance degradation of traditional underwater target localization algorithms in high-speed motion scenarios, this paper proposes a vertically moving localization method based on interference feature matching using a single hydrophone ...
Chunpeng Zhao +4 more
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Underwater Multi-Channel MAC with Cognitive Acoustics for Distributed Underwater Acoustic Networks. [PDF]
Sensors (Basel)The advancement of underwater cognitive acoustic network (UCAN) technology aims to improve spectral efficiency and ensure coexistence with the underwater ecosystem. As the demand for short-term underwater applications operated under distributed topologies, like autonomous underwater vehicle cluster operations, continues to grow, this paper presents ...
Yun C.
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Underwater Acoustic Scattering from Multiple Ice Balls at the Ice–Water Interface
Remote SensingWe investigate the underwater acoustic scattering from various distributed “ice balls” floating on the water, aiming to understand acoustic scattering in the marginal ice zone (MIZ).
Siwei Hu +4 more
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