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Legendre 다항식을 이용한 주파수 응답 함수의 곡선접합과 모드 매개변수 규명
박남규(Park, Nam-Gyu),전상윤(Jeon, Sang-Youn),서정민(Suh, Jeong-Min),김형구(Kim, Hyeong-Koo),장영기(Jang, Young-Ki),김규태(Kim, Kyu-Tae) 한국소음진동공학회 2006 한국소음진동공학회 논문집 Vol.16 No.7
A measured frequency response function can be represented as a ratio of two polynomials. A curve-fitting of frequency responses with Legendre polynomialis suggested in the paper. And the suggested curve-fitting algorithm is based on the least-square error method. Since the Legendre polynomials satisfy the orthogonality condition, the curve-fitting with the polynomials results to more reliable curve-fitting than ordinary polynomial method. Though the proposed curve-fitting with Legendre polynomials cannot cover all frequency range of interest, example shows that the suggested method is quite applicable in a limited frequency band.