dc.contributor.advisor | Aamo, Ole Morten | nb_NO |
dc.contributor.author | Hodne, Kjetil | nb_NO |
dc.date.accessioned | 2014-12-19T14:01:44Z | |
dc.date.available | 2014-12-19T14:01:44Z | |
dc.date.created | 2010-09-03 | nb_NO |
dc.date.issued | 2008 | nb_NO |
dc.identifier | 347602 | nb_NO |
dc.identifier | ntnudaim:4023 | nb_NO |
dc.identifier.uri | http://hdl.handle.net/11250/259684 | |
dc.description.abstract | A two-fluid model is used to derive a set of boundary conditions. The conditions are produced numerically, and try to imitate the behavior of output injection by using a linearized version of the model. In order to ensure that the model is hyperbolic, virtual mass terms are included in the momentum equations. An observer is presented, using OLGA, a fluid simulator, as its model. The boundary conditions derived are employed in the observer, and its convergence properties are shown to improve. A set of adaption laws for estimating parameters in a two-phase leak model is derived. Estimation of the leakage mass fraction is sacrifced in order to increase performance and stability. A model, also based on OLGA, is used to simulate a leak, and the observer prove to give good estimates of leak parameters as long as estimates of leakage mass fraction is available. Mass flow fraction seem to be a sufficient estimate. A wide range of scenarios are simulated, inspecting the weaknesses of the observer. | nb_NO |
dc.language | eng | nb_NO |
dc.publisher | Institutt for teknisk kybernetikk | nb_NO |
dc.subject | ntnudaim | no_NO |
dc.subject | SIE3 teknisk kybernetikk | no_NO |
dc.subject | Reguleringsteknikk | no_NO |
dc.title | Leak Detection in Two-Phase Oil and Gas Pipelines by Parameter- and State Estimation | nb_NO |
dc.type | Master thesis | nb_NO |
dc.source.pagenumber | 95 | nb_NO |
dc.contributor.department | Norges teknisk-naturvitenskapelige universitet, Fakultet for informasjonsteknologi, matematikk og elektroteknikk, Institutt for teknisk kybernetikk | nb_NO |