Classification society ABS says that more work is needed to better understand the effects of air lubrication systems (ALS) on the underwater radiated noise (URN) generated by a vessel. In recent years ALS manufacturers, such as industry leader Silverstream, have been keen to promote the URN-reducing benefits of ALS in addition to their energy saving […]
Propeller blade renewal intended to cut fuel consumption also has the potential to reduce underwater noise, reports Kari Reinikainen Efforts of the shipping industry to reduce fuel consumption and thereby pollution to the air may contribute to reduction of noise and vibration as well through the replacement of propeller blades. Rasmus Lyngdal-Christensen, senior specialist in […]
Although the effects of Underwater Radiated Noise (URN) caused by ships on marine life have been a cause of concern for many years it’s a nebulous, multi-faceted problem where evidence may be contentious and remedial action difficult to put into practice. Part of the challenge has been forging relationships between stakeholders from quite disparate fields […]