Search for dissertations about: "underwater noise"

Showing result 1 - 5 of 13 swedish dissertations containing the words underwater noise.

2. 1. Environmental Impact from Wave Energy Converters : Underwater Noise

   Author : Kalle Haikonen; Uppsala universitet; []
   Keywords : ;

   Abstract : Wave energy conversion is a potentially clean and sustainable form ofenergy conversion with no emissions of gases or liquids during operation.There are other environmental issues that need to be taken in consideration.The deployment of a wave power farm will contribute with new surface formarine organisms to colonize. READ MORE

4. 2. Underwater radiated noise from Point Absorbing Wave Energy Converters : Noise Characteristics and Possible Environmental Effects

   Author : Kalle Haikonen; Jan Sundberg; Sigray Peter; Uppsala universitet; []
   Keywords : Wave energy conversion; renewable energy; environmental impact; marine ecology; underwater noise;

   Abstract : The conversion of wave energy into electrical energy has the potential to become a clean and sustainable form of renewable energy conversion. However, like all forms of energy conversion it will inevitably have an impact on the marine environment, although not in the form of emissions of hazardous substances (gases, oils or chemicals associated with anticorrosion). READ MORE

5. 3. Underwater Positioning

   Author : Patric Jansson; Lars Sjöberg; KTH; []
   Keywords : ;

   Abstract : The project underwater positioning was initiated by the Swedish National Road Administration (SNRA) in 1990. The aim of the project is to study positioning techniques and methods which can be used to position and locate man-made structures and features, especially engineering structures, piles for the foundation*laying of bridge pillars, in shallow water. READ MORE

6. 4. Numerical prediction of propeller induced hull pressure pulses and noise

   Author : Muye Ge; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; RANS; Transition; IDDES; Cavitation; Pressure pulses; Sheet cavitation inception; Ship noise; k − ω SST; FWH acoustic analogy; Hydroacoustics;

   Abstract : An operating marine propeller is one of the major sources inducing hull pressure pulses, onboard noise and vibration as well as underwater radiated noise. There are rising concerns of environmental impacts and comfort and welfare of passengers and crews due to these negative effects. READ MORE

7. 5. On the Design of Noncoherent Acoustic Underwater Communication

   Author : Viktor Lidström; Magnus Lundberg Nordenvaad; Peter Sigray; Jacob Kuttenkeuler; Paul van Walree; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; noncoherent; acoustic underwater communication; link adaptation; adaptive networks; ickecoherent; akustisk undervattenskommunikation; länkadaption; adaptiva nätverk; Farkostteknik; Vehicle and Maritime Engineering;

   Abstract : The underwater domain is an environment hostile to humans due to the hydrostatic pressure that rapidly increases with water depth, which has led to underwater robotics becoming an emerging technological field with many commercial-, environmental-, and security-related applications. A major challenge to untethered autonomous underwater vehicles (AUVs) is communicating robot-to-robot and robot-to-topside operator since it must, in most cases, be done acoustically. READ MORE