The sound radiation of submerged structures is a topic of great interest both in the fields of underwater acoustics and marine engineering. In this context, the radiation efficiency is a very useful parameter to relate the underwater radiated noise and the vibration of a given structure. This paper investigates the average radiation efficiency of submerged … Read more
The interest for Harbour Protection Systems has increased since 9/11. The industry is developing systems capable of detecting small underwater threats as divers, UUV, ROVs or SDVs. Nowadays, the great majority of systems use the active acoustic theory to detect and track the threats. The active acoustic systems have the problem that they are detectable. … Read more
The interest for Harbour Protection Systems has increased since 9/11. The industry is developing systems capable of detecting small underwater threats as divers, UUV, ROVs or SDVs. Nowadays, the great majority of systems use the active acoustic theory to detect and track the threats. The active acoustic systems have the problem that they are detectable. … Read more
Renewable energies in the Offshore industry are the sector experiencing the most significant growth. Technology adapts common land-based energy installations to the marine environment. Common examples are storage, distribution, and energy transformation systems. The configurations with a more mature design are systems on the sea surface anchored to the seabed with auxiliary structures in fixed, … Read more
The overall signature of a vessel comprises acoustic, magnetic, electric-field, pressure, and seismic radiations. Over the past years, the international community’s efforts have mainly centered on reducing the acoustic influence with the dual aim of decreasing the vessel’s detectability and reducing the levels of acoustic pollution generated in the marine environment. Nowadays, the need to … Read more
SIRAMIS is a project coordinated by the European Defence Agency standing for Signature Response Analysis on Multi Influence Sensors, in this programme participates Sociedad Anónima de Electrónica Submarina (SAES) as international reference. As most of the international trade is carried out through marine routes, it is important to evaluate the vulnerability of the merchant vessel … Read more
This paper reports measurements for ultrasonic underwater acoustic communication (UAC) channels in Mediterranean shallow waters performed by the company SAES and the research group Ut2 of the University of Málaga. Statistical fit to the measured data is also carried out. The measurements have been conducted when the transmitter and the receiver are spaced 50, 100 … Read more
Underwater acoustic sensor networks are a promising technology that allow real-time data collection in seas and oceans for a wide variety of applications. Smaller size and weight sensors can be achieved with working frequencies shifted from audio to the ultrasonic band. At these frequencies, the fading phenomena has a significant presence in the channel behavior, … Read more