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Simulation of Laminated Object Manufacturing (LOM) with Variation of Process Parameters
A previously developed and verified thermal model for Laminated Object Manufacturing
(LOM) was used to investigate the effects of various processing parameters on the temperature
profile in a LOM part during the build cycle. The mathematical model, based on 3-dimensional
transient heat conduction in a rectangular geometry LOM part, allows calculation ofthe transient
temperature distribution within the part during the application of a new layer as well as during
other periods ofthe LOM build cycle. The parameters roller temperature, roller speed, chamber
air temperature, base plate temperature, and laser cutting time were independently varied, and the
LOM process response simulated. The results were analyzed in order to gain insight into
potential strategies for intelligent process control.Mechanical Engineerin
The Future Theater-Level Model: A Research Project Update
Proceedings of the 1994 Winter Simulation Conference ed. J. D. Tew, S. Manivannan, D. A. Sadowski, and A. F. SeilaResearch has been conducted at the Naval Postgraduate
School into new methodologies for joint theater-level combat
simulation modeling, emphasizing C3I, operational intelligence,
decisionmaking under uncertainty, and aggregated
stochastic process modeling. Research outcomes to date as
well as a prototype software tool are described in this paper
Modeling and analysis of uncertain time-critical tasking problems
Naval Research Logistics, 53 , No. 6, (Sept. 2006), 588-599.This paper describes modeling and operational analysis of a generic asymmetric services-system situation in which (a) Red agents, potentially threatening, but in another but important interpretation, are isolated friendlies, such as downed pilots, that require assistance and "arrive" according to some partially known and potentially changing pattern in time and space: and (b) Reds have effectively limited unknown deadlines or times of availability for Blue service, i.e., detection, classification, and attack in a military setting or emergency assistance in others. We discuss various service options by Blue service agents and devise several approximations allowing one to compute efficiently those proportions of tasks of different classes that are successfully serviced, or more generally, if different rewards are associated with different classes of tasks, the percentage of the possible reward gained. We suggest heuristic policies of a Blue server to select the next task to perform and to decide how much time to allocate to that service. We discuss this for a number of specific examples
Data analysis and modeling of Arctic sea ice subsurface roughness
Statistical data analysis and models are used to characterize and summarize the roughness of the underside of sea ice in the Arctic. Keel spacings and depths are modeled by sculptured exponentials, and by gamma distributions. The data studied was obtained by upward looking sonar on the submarine GURNARD during April, 1976, in the Beaufort Sea. The models and methods should be more widely applicablesupported in part by the Naval Postgraduate School
Foundation Research Program and by the Office of Naval Research, Arlington,
VA.http://archive.org/details/dataanalysismode00gaveN0001482WR20043N
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