Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2001. / Includes bibliographical references (leaf 43). / by M. Cameron Weaver. / S.M.

Thesis (Nav. E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1995, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995. / Includes bibliographical references (leaves 102-107). / by Jeffrey W. Stettler. / M.S. / Nav.E.

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995. / Includes bibliographical references (leaves 118-119). / by Ronald L. Frink. / S.M.

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1996, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996. / Includes bibliographical references (leaves 75-76). / by George L. Boone, III. / M.S.

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1995, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995. / Includes bibliographical references (leaves 79-80). / by Leonidas M.Th. Kambanis. / M.S.

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004. / Includes bibliographical references (p. 175-176). / Behavior of underwater sound propagation over long-ranges has been studied for several decades. The purpose of this is to describe sound propagation phenomena in various ocean environments. The key to understanding and visualizing is mathematical modeling. In the ocean acoustics community, four major mathematical techniques have been commonly used to model behavior of acoustic signal in the ocean environment. And they can be categorized into two different fields, range-independent and range-dependent. The accuracy of each method is depends on the environment characteristics. Since the propagating signal can be characterized through the mathematical modeling, it is then possible to use the propagating signal to perform beamforming and determine the characteristic of beam output. / by Wun Hoa Arthur Jai. / S.M.

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1996, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996. / Includes bibliographical references (p. 103-104). / by Thomas C. Miller. / M.S.

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2001. / Includes bibliographical references (leaves 119-120). / This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections. / Fabrication of pipes requires the use of several manufacturing processes, such as bending, welding, drilling and wringing. However, in most cases the circular ends deviate from true circles and need reformation to be welded to angles. Currently the reformation is conducted by hammering and relies on the intuition of skilled workers. This reforming process is not only expensive but also generates unhealthy loud noise. The objective of this research is to develop an automatic system of circularizing the ends of a deformed pipe by laser line heating. The overall problem is defined as follows: Given the design of a metal pipe, measure the shape of the cross sections of both ends and a branch end of the manufactured pipe and determine the heating paths together with the heating conditions to reform the manufactured pipe to within acceptable tolerances with respect to the designed pipe using the line heating method. The line heating conditions to be applied to the pipe have to be determined in real time to make the process ecient. A Neural Network is created for this purpose and the database used to run it is generated using a simplified thermo-mechanical model of the pipe validated by a Finite Element Model (FEM). / by Rodrigo V. Andrade. / S.M.

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1993, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1993. / Includes bibliographical references (leaves 118-120). / by Randall A. Villeneuve. / M.S.

<p> Turbulent simulations are performed for model- and full-scale hydrokinetic turbine using rotating blade using solution adapted grids up to 8.8M cells. The performance characteristics at both scales, and intermediate wake predictions at model-scale are validated using experimental data, and the effect of grids, turbulence modeling, scale and stanchion on the wake recovery is evaluated. The thrust and power predictions compare within 5% of the experimental data. LES performs better than other models for the wake prediction, and the averaged error is 7% and 30% in the near and intermediate wake, respectively. The large errors in the intermediate wake are due to poor predictions of cross plane turbulent fluctuations, which results in the under prediction of the wake diffusion. The wake deficit increases due to the effect of stanchion, and increase in Re. The far-wake shows a Gaussian profile, whose width and amplitude show linear increase and decrease, respectively, with progression.</p>