The University of Tokyo · Engineering
타카유키 야마다 교수의 연구실은 열전도도 최적화, 광학 케이프, 유전체 소재 기반의 최적 구조 설계 등에서 레벨셋 기반의 위상 최적화 기법을 핵심으로 삼고 있습니다. 특히 열역학적 및 전기기계적 상호작용을 고려한 다물질계 최적 설계, 신경망 기반 비선형 시스템 식별 및 제어, 그리고 회전 폭발 엔진의 수치 해석 등 응용 분야로의 확장을 지속하고 있습니다. 연구는 유한요소법과 복합적으로 결합된 정밀한 수치 해법 기반의 설계 기법 개발에 초점이 맞춰져 있습니다.
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This paper proposes an optimum design method, based on our level set-based topology optimization method, for maximizing thermal diffusivity in problems dealing with generic heat transfer boundaries that include design-dependent boundary conditions. First, a topology optimization method using a level set model incorporating a fictitious interface energy for regularizing the topology optimization is briefly discussed. Next, an optimization method for maximizing thermal diffusivity is formulated ba
An autotuning method for the optimum sigmoid function of neural networks is proposed. It is based on the steepest descent method. Simulated results using a learning-type direct controller confirm both the practicality and the characteristics of the autotuning method.
A practical neural network design method for the identification of both the direct transfer function and inverse transfer function of an object plant is proposed. As a practical application of the direct transfer function identifier, a nonlinear plant simulator is also proposed. Simulated and experimental results for a second-order plant show that identification can be satisfactorily achieved and that neural network identifiers can represent nonlinear plant characteristics very well. The charact
By introducing the vector and matrix notations in Tiersten's basic system of equations for the piezoelectric plates vibrating in thickness modes, admittance of the plates can be formulated for the assumed boundary conditions. Simple but general relations among resonant frequencies, antiresonant frequencies, and coupling factors are obtained.
This paper proposes a topology optimization method for a dielectric optical cloak that provides results that are perfectly free from intermediate materials, based on a level set boundary expression and the Finite Element Method. The finite element mesh is re-generated to fit the iso-surface of the level set function at every iterative step, to remove intermediate materials, so that the obtained optimal structure consists of only two materials, the dielectric material and air. First, the level se
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