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Improved system identification method for Hammerstein-Wiener processes
성수환,Cheol Ho Je,이지태,Dong Hyun Lee 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.4
We propose a new system identification method for Hammerstein-Wiener processes, in which an input static nonlinear block, a linear dynamic block, and an output static nonlinear block are connected in a series. The proposed method can estimate the model parameters in a very simple way without solving the full-dimensional nonlinear optimization problem by activating the process with a specially designed test signal, composed of a relay feedback signal, a binary signal and a multi-step signal. The proposed method analytically identifies the output nonlinear static function and the input nonlinear static function from the relay signal and the multi-step signal, respectively. The linear dynamic subsystem is identified from the relay feedback signal and the binary signal with existing well-established linear system identification methods. We demonstrate with a simple example that the proposed method can be successfully applied to identify the Hammerstein-Wiener-type nonlinear process.
성형툴의 상태에 따른 탄소섬유강화 복합재 구조물의 변형 예측
성수환,김위대 한국항공우주학회 2014 한국항공우주학회 학술발표회 논문집 Vol.2014 No.11
오토클레이브 성형은 성형제품의 품질은 우수하나 생산비용이 비싸다는 단점이 있다. 생산비용 중에서도 큰 비중을 차지하는 것이 성형툴의 제작공정이다. 따라서 본 연구에서는 생산비용 절감을 위한 선행 연구로서 성형툴의 재질 및 표면상태에 따라 L-Shape 제품의 성형후 Spring-in 을 Abaqus Subroutine 을 이용하여 계산하였고, 열팽창계수와 마찰계수에 따른 결과를 나타내었다. 또한 성형툴 제작시 재질 및 표면상태의 기준점을 제시하여 생산비용을 줄이는데 기여하고자 한다. Autoclave processing have good quality of product, but manufacturing cost is expansive. It is very important disadvantage. Manufacturing cost consist of various factor, one of the most biggest factor is tool cost. Therefore, this paper is basic research for reducing manufacturing cost. When manufacture L-shape composite structure occur distortion, such as spring-in. It is calculated using ABAQUS. And then show results about coefficient of thermal expansion and tool surface condition. And this paper suggest reference point of tool material and surface condition selection.