Model Predictive Control for Underwater Robots in Ocean Waves Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/k643b4923

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  • Underwater robots beneath ocean waves can benefit from feedforward control to reduce position error. This thesis proposes a method using Model Predictive Control (MPC) to predict and counteract future disturbances from an ocean wave field. The MPC state estimator employs a Linear Wave Theory (LWT) solver to approximate the component fluid dynamics under a wave field. Wave data from deployed ocean buoys is used to construct the simulated wave field. The MPC state estimator is used to optimize a set of control actions by gradient descent along a prediction horizon. The optimized control input minimizes a global cost function, the squared distance from the target state. The robot then carries out the optimized trajectory with an emphasis on real-time execution. Several prediction horizons are compared, with a horizon of 0.8 seconds selected as having a good balance of low error and fast computation. The controller with the chosen prediction horizon is simulated and found to show a 74% reduction in position error over traditional feedback control. Additional simulations are run where the MPC takes in noisy measurements of the wave field parameters. The MPC algorithm is shown to be resistant to sensor noise, providing a mean position error 44% lower than the noise-free feedback control case.
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  • description.provenance : Made available in DSpace on 2015-09-25T17:22:57Z (GMT). No. of bitstreams: 2 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) FernándezDanielC2015.pdf: 2227678 bytes, checksum: afdd78a9a000055d2b31c1f6a2aaf908 (MD5) Previous issue date: 2015-09-14
  • description.provenance : Rejected by Julie Kurtz(julie.kurtz@oregonstate.edu), reason: Rejecting to change the commencement date on the bottom of the title page from 2015 to 2016 so it reads - Commencement June 2016. Everything else looks good. Once revised, log back into ScholarsArchive and go to the upload page. Replace the attached file with the revised file and resubmit. Thanks, Julie on 2015-09-23T18:42:36Z (GMT)
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