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Hydrodynamic Ship Design Optimization Considering Uncertainty
Start Date: 5/1/2014Start Time: 2:00 PM
End Date: 5/1/2014End Time: 3:00 PM


Emilio F. Campana
CNR-INSEAN; National Research Council of Italy – Marine Technology Research Institute

Phillips Hall 640

Hosted by Dr. Philippe Bardet (bardet@gwu.edu)

In a traditional design optimization process, the variables and the parameters are usually considered as deterministic inputs. The resulting deterministic optimum has a high probability of violating the design constraints, due to the inherent geometrical, operational and modeling/numerical uncertainties involved in the simulation-based design process. This lecture highlights a few recent contributions in the field of optimization under uncertainty with application to ship hydrodynamic design, assuming that objective functions and constraints are evaluated via high fidelity analysis tools (i.e. computationally expensive partial differential equations solvers). The development of advanced, efficient tools for uncertainty quantification and design optimization of ships operating in a real scenario are described. This requires a significant reformulation of both optimization problem and solution methods compared to deterministic approaches. To afford the cost of the stochastic optimization process, a number of new techniques have had to be developed and/or implemented: (i) metamodels for the high-fidelity solvers and associated uncertainty quantification of stochastic simulation outputs, (ii) variable-fidelity approaches coupled with trust region methods, (iii) new global optimization derivative-free algorithms, (iv) principal component analysis algorithms — such as Proper Orthogonal Decompositions (POD) or Karhunen-Loève expansion (KLE) — to identify reduced dimensionality representations of large-scale design spaces, truncating basis functions with small significance to the solution. Examples of real ship hydrodynamic design optimization cases are given, reporting results mostly collected through a series of projects funded by the Office of Naval Research.

Emilio F. Campana (Rome, 1960) received the honors degree in Mechanical Engineering (1984) and the PhD on Theoretical and Applied Mechanics at the University of Rome “La Sapienza” (1991). After two years at the IBM-ECSEC (IBM - European Centre for Scientific and Engineering Computing) he joined the Italian National Maritime Research Centre (INSEAN), now part of the National Research Council of Italy (CNR). He has been doing research in numerical methods for hydrodynamics and design optimization for more than 20 years and in 2011 was appointed Director of INSEAN-CNR. He is the author of about 140 papers and publications in naval hydrodynamics, and his most recent research topic is the development of algorithmic tools for Simulation Based Design, using multidisciplinary and robust design optimization approaches. He is the recipient of the American Bureau of Shipping award for the best technical paper presented at the 2009 US Society of Naval Architects and Marine Engineers (SNAME) annual meeting, of the 2012 NATO (Research and Technology Organization) - Scientific Achievement Award, and in 2013 was appointed “George Weinblum Memorial Lecturer” jointly from the German Institut für Schiffbau (Hamburg University), the SNAME and the Naval Studies Board of the National Research Council (USA).
Contact:
Cindy
Fields Arnold
cfa@gwu.edu
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