Underwater Noise Generated by a Small Ship in the Shallow Sea

Abstract

Study of the sea noise has been a subject of interest for many years. The first works in this scope were published at the turn of the twentieth century by Knudsen (Knudsen et al., 1948) and G. Wenz (Wenz, 1962). Disturbances called "shipping noise" are one of the important components of the sea noise.In this work the results of an experimental research of underwater noise produced by a small ship of a classic propulsion are presented. A linear receiving antenna composed of two orthogonal components was used in the investigation. Identification of the main sources of acoustic waves related with the ship was achieved. In addition, the intensity of the wave was measured. The research was performed in conditions of the shallow sea.

Dolphin-Inspired Target Detection for Sonar and Radar

“…These include attempts to derive beneficial effects from bubble acoustics, in fields as diverse as: climate science for air/sea transfer (Thorpe, 1992 ; the processing and monitoring of pharmaceuticals and food (Campbell, Mougeot, 1999;Skumiel et al, 2013), and of fuel and coolant (Leighton et al, 2012a); the generation of microfluidic devices (Carugo et al, 2011); ultrasonic cleaning (Leighton et al, 2005;Offin et al, 2014); and, in biomedicine, the provision of acoustic contrast agents and drug delivery vectors (Ferrara et al, 2007), and the use of cavitation as a therapy monitor (McLaughlan et al, 2010;Leighton et al, 2008a). Studies also include attempts to mitigate or exploit the detrimental effects of bubbles, for example in the cavitation erosion of turbines and propellers Szantyr, Koronowicz, 2006), ship noise and its environmental impact (Kozaczka, Grelowska, 2004;Parks et al, 2007;Grelowska et al, 2013), and the sonar clutter that oceanic bubbles can produce. With improvements in computing resources, and increases in the power of sonar sources and the bandwidth of receivers (Kozaczka, Grelowska, 1999;Ainslie, 2010), it became clear that the bubbles can readily be driven to produce nonlinear effects (Leighton et al, 1997;2004a;Lauterborn et al, 2008; Baranowska, 2012), although the models used in sonar studies to describe such scattering were predominantly linear and steady state (Clarke, Leighton, 2000; Ainslie, .…”

Digital Signal Processing Applied to the Modernization Of Polish Navy Sonars

“…Because passive sonars receive and process broadband signals of shipping noise with frequency bands comprising several octaves [9,17,18,19], spatial signal processing in the sonars is much more complex than described in the previous section. The SQR-19PG sonar with towed linear array is an example.…”

Technical Monitoring System for a New Part of Gdańsk Deepwater Container Terminal

“…One of the elements of the approved strategy is the extension of the Deepwater Container Terminal in Gdańsk, which has been aimed at the building of a terminal for servicing container carriers of ULCV class (Ultra Large Container Vessels) of over 18,000 TEU (Twenty-foot Equivalent Units) capacity ( Fig. 1), that required deepening the basin and performing appropriate diagnostics [6], [7], [13], [20]. In this task, in view of a complex soil -water conditions, all geotechnical operations constituted a crucial element for successful finalization of the undertaking.…”