A Comparative Study of Methods for Optimising Sensor and Actuator Locations in Active Control Applications

Design Optimization of Marine Engine-Mount System

“…This is due to the factors that all the conventional gradient-based algorithms are based upon the functions with continuous "rst and second derivatives of objective function and non-linear constraints. However, the objective function F V here may not be able to satisfy this requirement since the absolute value is applied for F V in equation (11). Another reason is that the objective function may not be able to satisfy the conditions of strictly convexity and each equity or inequity constraint may not be a concave function [18].…”

“…However, due to the random character of search process, genetic optimization requires a huge amount of useless objective function evaluations and thus a long computer time. Fonseca [11] indicated that the best gradient-based algorithms even produces a better and faster solution than the best genetic algorithm in a similar amount of computational time. Pogu et al [12] considered genetic algorithm and other random search technique only as &&last resort'' methods for solving continuous optimization problems.…”

Variable Sound Insulation Structure with MFC Elements

“…Correct selection of executive elements acting as the aforementioned additional sources of energy to a great extent decides on the usefulness of those methods and their practical applicability (De Fonseca et al, 1999;Fraden, 2004;Kozień, Wiciak, 2003). A definite majority of active noise control (ANC) systems use additional sources of noise in the form of loudspeakers as executive elements.…”

Controle ativo de ruído em veículos e seu impacto na qualidade sonora

“…Em geral, a abordagem adotada no projeto de sistemas de controle se concentra na escolha do número e localização de sensores e atuadores, buscando com isso uma configuração ótima para o controle desejado (de Fonseca et al, 1999;Oliveira et al, 2005 …”

“…Em geral, a função objetivo deste sistema de controle é uma grandeza acústica como potência sonora (Henrioulle, 2001). Contudo, o sucesso de tal sistema depende de vários fatores, entre outros, a estratégia de controle, a natureza das fontes primárias de distúrbio e a escolha adequada de sensores, atuadores e de suas posições (Elliott, 1994;de Fonseca et al, 1999).…”