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Wave propagation in finite element and mass-spring-dashpot lattice models
(Massachusetts Institute of Technology, 2006)
Numerical efficiency comparisons of a four-node finite element model (FEM), a mass-spring lattice model (MSLM), and a mass-spring-dashpot lattice model (MSDLM) are investigated. Specifically, the error in the ultrasonic ...
Systems modeling for electric ship design
(Massachusetts Institute of Technology, 2004)
Diesel and gas turbine electric ship propulsion are of current interest for several types of vessels that are important for commercial shipping and for the next generation of war ships. During the design process of a ...
Selection of composite materials for the construction of large ships
(Massachusetts Institute of Technology, 2000)
Particulate matter emissions from a DISI engine under cold-fast-idle conditions for ethanol-gasoline blends
(Massachusetts Institute of Technology, 2011)
In an effort to build internal combustion engines with both reduced brake-specific fuel consumption and better emission control, engineers developed the Direct Injection Spark Ignition (DISI) engine. DISI engines combine ...
Using the non-intrusive load monitor for shipboard supervisory control
(Massachusetts Institute of Technology, 2007)
Field studies have demonstrated that it is possible to evaluate the state of many shipboard systems by analyzing the power drawn by electromechanical actuators [1], [2], [3], [4], [5]. One device that can perform such an ...
Non-intrusive vibration monitoring in US Naval and US Coast Guard ships
(Massachusetts Institute of Technology, 2013)
In 2011, the Laboratory for Electromagnetic and Electronic Systems proposed a new type of vibration monitoring system, entitled vibration assessment monitoring point with integrated recovery of energy or VAMPRIE, in their ...
Propeller design optimization for tunnel bow thrusters in the bollard pull condition
(Massachusetts Institute of Technology, 2012)
Tunnel bow thrusters are often used by large ships to provide low-speed lateral maneuverability when docking. Required to provide high thrust while essentially at a standstill, the design point for these thrusters is the ...
Dynamics of naval ship design : a systems approach
(Massachusetts Institute of Technology, 1998)
The 1990 Naval Sea Systems Command Ship Design, Acquisition and Construction (DAC) Study provides a stepping stone for the implementation of improvements towards optimizing ship performance, cutting acquisition costs, and ...
Surfacing Rescue Container concept design for trident submarines
(Massachusetts Institute of Technology, 2009)
In the wake of the KURSK tragedy, world navies have brought their full attention to the submarine rescue problem. While many rescue systems exist, none have been able to sufficiently address the gamut of scenarios that ...
Development of a representative volume element of lithium-ion batteries for thermo-mechanical integrity
(Massachusetts Institute of Technology, 2011)
The importance of Lithium-ion batteries continues to grow with the introduction of more electronic devices, electric cars, and energy storage. Yet the optimization approach taken by the manufacturers and system designers ...