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Now showing items 31-39 of 39
Next generation probabilistic prediction model for submarine propulsion shaft life
(Massachusetts Institute of Technology, 2018)
With the development of the U.S. Navy's new COLUMBIA class ballistic missile submarine, the Navy plans to implement a new, longer operational inspection interval for the propulsion shaft system, attempting to double the ...
Bragg reflector geometries for colorimetric orientation and deformation sensing
(Massachusetts Institute of Technology, 2016)
Propulsion systems of commercial and naval ships are typically large and expensive. They must be kept well-aligned and free of corrosion to efficiently and reliably transfer torque to a ship's propeller. Early identification ...
An investigation into the design of surface piercing super cavitating hydrofoils
(Massachusetts Institute of Technology, 2017)
The fluid-dynamic design of hydrofoils to support marine crafts at high speeds has received growing interest in recent years. Physics involved in the design of high-speed surface-piercing hydrofoils is complex involving ...
Time-optimal multi-waypoint mission planning in dynamic flow fields
(Massachusetts Institute of Technology, 2018)
This thesis demonstrates the use of exact equations to predict time-optimal mission plans for a marine vehicle that visits a number of locations in a given dynamic ocean current field. The missions demonstrated begin and ...
Combined tensile-compressive biaxial loading of Li-ion battery components
(Massachusetts Institute of Technology, 2018)
Lithium-ion batteries under a mechanical load can develop failures in the internal multi-layer structure. Due to the flammable materials required for construction, the safety of the battery has been in question since it ...
Enabling tactical autonomy for unmanned surface vehicles in defensive swarm engagements
(Massachusetts Institute of Technology, 2018)
This research incorporates practical applications of marine vehicles with robotics control theory to reduce the vulnerability of allied assets to asymmetric warfare. This work utilizes distributed decentralized multi-objective ...
Design, construction, and analysis of a modular ship model and open-source autonomous surface vehicle
(Massachusetts Institute of Technology, 2020)
Existing models used to explore hydrostatic, hydrodynamic, seakeeping, and maneuvering characteristics of ships are limited in that their characteristics are essentially static. The effects of various hull appendages, ...
The design, feasibility and cost analysis of sea barrier systems in Norfolk, Virginia and the comparative cost of shoreline barriers
(Massachusetts Institute of Technology, 2020)
Protecting a coastline from the damage of a storm surge, or tidal flooding associated with sea level rise, is a challenging and costly engineering endeavor. Low lying properties located directly on an ocean coastline are ...
Slip clutch design for position sensitive systems in marine environments
(Massachusetts Institute of Technology, 2017)
The Naval Research Laboratory (NRL) requested a two-axis pan tilt mechanism be designed, built, and tested for shipboard deployment of a sensor payload. Of paramount consideration to this design was the robustness of the ...