Results 91 to 100 of about 1,348,870 (188)

Excitation of the ship structure via propeller shaft and thrust bearing

, 2022
This paper demonstrates by model measurements the influence of in-plane forces (exciting the ship structure ) on structureborne noise and the adjacent underwater radiated noise.
Wittek, G.
core   +1 more source

Preprocessing LOFARgram through U-Net++ neural network

Frontiers in Marine Science
The study of the low-frequency analysis and recording spectrum (LOFARgram) of ship-radiated noise is essential for extracting critical information, such as target motion trajectories.
Dan Peng, Xichen Xu, Wenhua Song, Dazhi Gao   +3 more
doaj   +1 more source

Modelling of underwater radiated noise from ships measured at the Lofoten-Vesterålen cabled observatory

Time histories of broadband ship noise measured at the Lofoten-Vesterålen cabled observatory (on the seafloor at 255 m depth in the Norwegian Sea) are compared to model-based predictions.
Pedersen, Geir, Brown, Michael G, Zhang, Guosong, Murray, Gabrielle A   +3 more
core   +1 more source

Quantifying bias in underwater radiated noise measurement

The measurement of ship underwater radiated noise (URN) is a foundational element of underwater noise management policies. These measurements are frequently made in shallow water (
Dupuis, Jasper
core  

Review of reciprocity measurement theory and its applications in ship mechanical-acoustic systems

Zhongguo Jianchuan Yanjiu
With increasing demands for enhanced ship stealth performance and onboard comfort, precise quantification of vibro-acoustic characteristics in complex ship systems is critical for optimizing structural acoustic design and reducing radiated noise ...
Tao PENG, Rongwu XU, Jiarui ZHANG, Zhenyu YAO   +3 more
doaj   +1 more source

Ship-Radiated Noise Recognition Based on Dual Low-Rank Adaptation Training

水下无人系统学报
To address the limited generalization capability of deep learning models in ship-radiated noise recognition caused by data shortage and domain shift, this paper proposed a dual low-rank adaptation transfer learning framework of weights and features. This
Zhixun MA, Ning TANG, Xuan LI, Chengpeng HAO   +3 more
doaj   +1 more source

Introducing the Brand New QiandaoEar22 Dataset for Specific Ship Identification Using Ship-Radiated Noise [PDF]

Target identification of ship-radiated noise is a crucial area in underwater target recognition. However, there is currently a lack of multi-target ship datasets that accurately represent real-world underwater acoustic conditions.
Du, Xiaoyang, Hong, Feng
core  

Underwater ship passport [PDF]

, 2004
For years in the Polish Navy extensive measurements have been made of the underwater-radiated noise by different kinds of surface ships. To identify the source of noise, the level of vibration was also measured by accelerometers inside each ship section.
Gloza, I.
core  

The Influence of Drag Reducing Polymer on Radiated Noise from Rough Surfaces

, 1972
Experimental measurements were made of radiated noise from a rough surface moving in water and from the same surface moving in a dilute water solution of a drag reducing polymer.
Killen, John
core  

Line Spectrum Detection Algorithm of Single Vector Sensor Based on Singular Value Difference

Applied Sciences
The line spectrum of ship-radiated noise can be used in passive sonar to detect ship targets; however, it is affected by ocean noise and the Doppler effect, which has a negative effect on target detection. In the paper, the multi-channel data of a single
Xue Han, Yang Wang, Yan Huo, Peng Han, Chang Zhang   +4 more
doaj   +1 more source