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Optimizing ballast design of wave energy converters using evolutionary algorithms

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dc.contributor.advisor Tumer, Kagan
dc.creator Colby, Mitchell
dc.date.accessioned 2012-05-07T17:31:50Z
dc.date.available 2012-05-07T17:31:50Z
dc.date.copyright 2012-03-12
dc.date.issued 2012-03-12
dc.identifier.uri http://hdl.handle.net/1957/29043
dc.description Graduation date: 2012 en_US
dc.description.abstract Wave Energy Converters (WECs) promise to be a viable alternative to current electrical generation methods. However, these WECs must become more efficient before wide-scale industrial use can become cost-effective. The efficiency of a WEC is primarily dependent upon its geometry and ballast configuration which are both difficult to evaluate, due to slow computation time and high computation cost of current models. In this thesis, we use evolutionary algorithms to optimize the ballast geometry of a wave energy generator using a two step process. First, we generate a function approximator (neural network) to predict wave energy converter power output with respect to key geometric design variables. This is a critical step as the computation time of using a full model (e.g., AQWA) to predict energy output prohibits the use of an evolutionary algorithm for design optimization. The function approximator reduced the computation time by over 99% while having an average error of only 3.5%. The evolutionary algorithm optimized the weight distribution of a WEC, resulting in an 84% improvement in power output over a ballast-free WEC. en_US
dc.language.iso en_US en_US
dc.subject Optimization en_US
dc.subject Wave Energy en_US
dc.subject.lcsh Ocean wave power en_US
dc.subject.lcsh Evolutionary computation en_US
dc.subject.lcsh Oceanographic buoys -- Stability
dc.title Optimizing ballast design of wave energy converters using evolutionary algorithms en_US
dc.type Thesis/Dissertation en_US
dc.degree.name Master of Science (M.S.) in Mechanical Engineering en_US
dc.degree.level Master's en_US
dc.degree.discipline Engineering en_US
dc.degree.grantor Oregon State University en_US
dc.contributor.committeemember Balasubramanian, Ravi
dc.contributor.committeemember Batten, Belinda
dc.contributor.committeemember Barbosa, Andre R.
dc.description.peerreview no en_us

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