Conservative methods for structural optimization

Bennett, James A.; Lust, R. V.

doi:10.2514/6.1989-1219

Cited by 3 publications

(4 citation statements)

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“…Researches have been conducted to improve the robustness of the structures (Lee et al 1996;Bennet and Lust 1990;Parkinson 1995). In many cases, optimization technique is applied with some modifications and Taguchi's concept is considered for the improvement of the robustness.…”

Section: Robust Designmentioning

confidence: 99%

Robust optimization of an automobile rearview mirror for vibration reduction

Hwang

Lee

Park³

2001

Structural and Multidisciplinary Optimization

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An automobile outside rearview mirror system has been analysed and designed to reduce vibration with a finite element model. Modal analysis is conducted for the calculation of natural frequencies. Harmonic analysis is utilized to estimate the displacements of the glass surface under dynamic loads. The model is verified with the vibration experiment for the parts and the assembled body. The structure of the mirror system is optimized for robustness defined by the Taguchi concept. At first, many potential design variables are defined. Final design variables are selected based on the amount of contribution to the objective function. That is, sensitive variables are chosen. The signal-to-noise (S/N) ratio in the Taguchi method is replaced by an objective function with mean and standard deviations of the quality characteristics. The defined objective function is appropriate for structural design in that the vibration displacements are minimized while the robustness is improved.

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Section: Robust Designmentioning

confidence: 99%

Robust optimization of an automobile rearview mirror for vibration reduction

Hwang

Lee

Park³

2001

Structural and Multidisciplinary Optimization

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“…Although this is a simple and straightforward approach, there has always been a desire to use a somewhat more reasoned approach. Bennett and Lust (1990) present a discussion of some of these concepts with respect to structural design problems. The notion of conservativeness or robustness has a particular importance in the safety area.…”

Section: Automotive Occupant Dynamics 477mentioning

confidence: 99%

“…For structural optimization problems a sensitivity or gradient based approach to robust design was proposed Bennett and Lust (1990). This approach suggested that the safety factor or padding term be made proportional to the gradient of the constraint.…”

Section: Automotive Occupant Dynamics 477mentioning

confidence: 99%

Automotive Occupant Dynamics Optimization

Bennett

Park

1995

Shock and Vibration

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One of the more difficult optimal design tasks occurs when the data describing the system to be optimized is either highly nonlinear or noisy or both. This situation arises when trying to design restraint systems for automotive crashworthiness using the traditional lumped parameter analysis methods. The nonlinearities in the response can come from either abrupt changes in the occupants interaction with the interior or from relatively minor fluctuation in the response due to the interactions of two restraint systems such as belts and airbags. In addition the calculated response measures are usually highly nonlinear functions of the accelerations. Two approaches using an approximate problem formulation strategy are proposed. One approach uses a first-order approximation based on finite difference derivatives with a nonlocal step size. The second and more effective approach uses a second-order curve fitting strategy. Successful example problems of up to 16 design variables are demonstrated. A conservative design strategy using a derivative-based constraint padding is also discussed. The approach proves effective because analytical expressions are available for the second-order terms.

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“…Além disso, métodos ditos possibilistas, baseados na aritmética dos intervalos, foram desenvolvidos para avaliar a variação das respostas quando os parâmetros descrevem intervalos (BRAIBANT; DELCROIX; OUDSHOORN, 1998 ;DESSOMBZ et al, 2001). Muitos autores propuseram a avaliação da robustez das soluções ótimas apenas ao final do processo de otimização (BENNETT; LUST, 1990). Os principais inconvenientes destas estratégias são: a necessidade sistemática das expressões analíticas da função objetivo e a utilização da ponderação destas funções, que excluem a busca de eventuais soluções nas regiões não convexas do espaço das soluções robustas.…”

Section: Consideração Da Robustez Na Busca Do óTimounclassified

Projeto robusto de Circuitos Shunt para o controle passivo de vibrações de estruturas compostas

Vicente¹

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À minha família, Valquíria e Clara, que me apoiaram incondicionalmente nesse caminho, sempre prontas a ajudar e não medindo esforços para me oferecer todo carinho e atenção.Aos meus pais, Gonçalo e Silvia e meus irmãos Lizie, Evandro e Débora pela minha formação moral, caráter e personalidade, fatores sem os quais nada disso seria possível.Ao meu orientador, Prof. Dr. Antônio Marcos Gonçalves de Lima, pelo excelente e vigoroso trabalho de orientação, bem como por valorosos conselhos, incansável dedicação, sincera amizade e preocupação com minha carreira.

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Conservative methods for structural optimization

Cited by 3 publications

References 0 publications

Robust optimization of an automobile rearview mirror for vibration reduction

Robust optimization of an automobile rearview mirror for vibration reduction

Automotive Occupant Dynamics Optimization

Projeto robusto de Circuitos Shunt para o controle passivo de vibrações de estruturas compostas

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