Search results for "Shape optimization"

showing 4 items of 44 documents

Electromagnetic Sensitivity Analysis and Shape Optimization Using Method of Moments and Automatic Differentiation

2009

Sensitivity analysis is an important part of gradient-based optimization of electromagnetic devices. We demonstrate how sensitivity analysis can be incorporated into an existing in-house method of moments solver with a relatively small amount of labor by using a technique called automatic differentiation (AD). This approach enables us to obtain (geometrical) sensitivities of the discrete solution with accuracy up to numerical precision. We compare the assembly time and memory usage of the modified and original solvers. Moreover, we optimize the shape of a dipole antenna and the dimensions of a Yagi-Uda array using the presented AD technique, traditional response level finite difference sens…

Antenna arrayMathematical optimizationAutomatic differentiationFinite difference methodShape optimizationSensitivity (control systems)Electrical and Electronic EngineeringMethod of moments (statistics)SolverAlgorithmGradient methodMathematicsIEEE Transactions on Antennas and Propagation
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Evolutionary design optimization with Nash games and hybridized mesh/meshless methods in computational fluid dynamics

2012

Eulerin virtausmallihybridized mesh/meshless methodsvirtauslaskentageneettiset algoritmitevoluutioalgoritmitposition reconstructionevoluutiolaskentahierarchical genetic algorithmsdynamic cloudsuunnitteluoptimointishape optimizationalgoritmitpeliteoriaadaptive meshless methodevolutionary algorithmsNash games
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Shape optimization in contact problems based on penalization of the state inequality

1986

The paper deals with the approximation of optimal shape of elastic bodies, uni­laterally supported by a rigid, frictionless foundation. Original state inequality, describing the behaviour of such a body is replaced by a family of penalized state problems. The relation between optimal shapes for the original state inequality and those for penalized state equations is established. peerReviewed

msc:49M30msc:73k40frictionless plane contact [keyword]minimization of the total potential energy [keyword]msc:74M15linear-elastic sheet [keyword]rigid foundation [keyword]msc:74P99contact boundary curve [keyword]family of penalized state problems [keyword]existence [keyword]msc:49J40convergence [keyword]nonlinear programming problem [keyword]msc:73T05shape optimization [keyword]box constraints [keyword]msc:74S05linear equality constraint [keyword]msc:74A55linear inequality constraints [keyword]
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Multi-objective actuator placement optimization for local sound control evaluated in a stochastic domain

2013

A method to find optimal locations and properties of anti-noise actuators in a local noise control system is considered. The local noise control performance is approximated by an approach based on a finite element method, attempting to estimate the average performance of an optimal active noise control (ANC) system. Local noise control uses a fixed number of circular actuators that are located on the boundary of a three-dimensional enclosed acoustic space. Actuator signals are used to minimize the known harmonic noise at specified locations. The average noise reduction is maximized at two frequency ranges by adjusting the anti-noise actuator configuration, which is a non-linear multi-object…

mallintaminenakustiikkapassive noise controlfinite element methodshape optimizationmelunvaimennuscomputational acousticsmatemaattiset mallitactive noise controlacousticsmeluntorjunta
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