Results 21 to 30 of about 2,187,898 (350)
IEEE Journal of Oceanic Engineering, 2021 The Intensity Vector Autonomous Recorder (IVAR) measures acoustic particle velocity and pressure simultaneously. IVAR was deployed on the seabed during the 2017 Seabed Characterization Experiment (SBCEX) with the primary objective to study sound ...
P. Dahl, D. Dall'Osto
semanticscholar +1 more source
Materials & Design, 2022 The water-lubricated bearing will be in a state of poor lubrication when marine stern shafts operate under low speed and heavy load conditions, which could cause severe wear and vibration, endangering the stealth performance of underwater vehicles.
Yinsong Liu +4 more
doaj +1 more source
Journal of Marine Science and Engineering, 2021 Marine soundscapes consist of cumulative contributions by diverse sources of sound grouped into: physical (e.g., wind), biological (e.g., fish), and anthropogenic (e.g., shipping)—each with unique spatial, temporal, and frequency characteristics.
C. Erbe +3 more
semanticscholar +1 more source
Optimal Universal Controllers for Roll Stabilization [PDF]
, 2020 Roll stabilization is an important problem of ship motion control. This problem becomes especially difficult if the same set of actuators (e.g. a single rudder) has to be used for roll stabilization and heading control of the vessel, so that the roll ...
Cao, Ming +2 more
core +2 more sources
Performance research and safety verification of compound structure air spring
Advances in Mechanical Engineering, 2020 To further reduce the vertical stiffness of the air spring, appropriately reduce its lateral stiffness to attenuate the transmission of vibration along the lateral and longitudinal directions, a compound structure air spring (CSAS) was designed.
Lihang Yin +4 more
doaj +1 more source
Underwater Target Localization Using Opportunistic Ship Noise Recorded on a Compact Hydrophone Array
Acoustics, 2021 In this research, a new application using broadband ship noise as a source-of-opportunity to estimate the scattering field from the underwater targets is reported. For this purpose, a field trial was conducted in collaboration with JASCO Applied Sciences
Mojgan Mirzaei Hotkani +4 more
semanticscholar +1 more source
Ship Identification Based on Ship Blade Noise [PDF]
, 2017 In this paper, we propose a new method about ship identification, which is based on paddle noise for classification and recognition. Blade noise is the feature that is used to identify ships, blade noise is collected by digital hydrophone, then the signal is converted to spectrum. We extract features based on the difference of the pixel in the picture.
Qi, Haitao, Xu, Zhijing
openaire +2 more sources
Vojnotehnicki glasnik, 1998 This paper discusses sources of shipboard noise. Effects of some specific measures of shipboard noise control such as stern wells are described. Some additional measures of ship compartments acoustical treatment are explained as well as the noise criteria applied to accommodation areas on a patrol boat, noise control approaches, treatments and achieved
openaire +2 more sources
Advances in Mechanical Engineering, 2021 The structure displacement of the raft of vibration isolation for ships is an important factor that affects shafting alignment accuracy and the safety of the equipment on the raft.
Guanghui Cheng +3 more
doaj +1 more source
Close range ship noise cross correlations with a vector sensor in view of geoacoustic inversion [PDF]
, 2016 Distant ship noise has been utilized for geoacoustic inversion and ocean monitoring for many years. In a shallow water experiment, Makai 2005, a 4-element acoustic vector sensor array was deployed at the stern of the research vessel R/V Kilo Moana.
Felisberto, P. +3 more
core +1 more source