서지주요정보
1/3 옥타브 웨이브렛 변환을 이용한 과도상태 변형형상의 가시화 및 평판의 진동/소음 저감에의 응용 = Visualization of transient deflection shapes using 1/3 octave wavelet transform and its application to vibration and noise reduction of a plate
서명 / 저자 1/3 옥타브 웨이브렛 변환을 이용한 과도상태 변형형상의 가시화 및 평판의 진동/소음 저감에의 응용 = Visualization of transient deflection shapes using 1/3 octave wavelet transform and its application to vibration and noise reduction of a plate / 백상흠.
저자명 백상흠 ; Baik, Sang-Hum
발행사항 [대전 : 한국과학기술원, 1997].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8007622

소장위치/청구기호

학술문화관(문화관) 보존서고

MME 97042

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

When a structure is subjected to an excitation, it vibrates and subsequently radiates noise. Sound pressure level at a given location around the structure is somehow correlated with the structural vibrations and hence it is possible to identify major sources of the noise and do treatments on the structure by observing its operational deflection shapes. If sources of a non-stationary noise such as a one due to an impact excitation is to be identified, analysis of time-varying deflection shapes is desirable. Also, sound pressure level of noise from a structure of high modal density can be more meaningfully interpreted by frequency domain analysis over proportional bandwidth than over constant bandwidth. In order to satisfy these two requirements, harmonic wavelet transform technique is proposed. Since noise is usually analyzed over 1/3 octave bands, use of 1/3 octave wavelet transform is studied in this thesis. Basic backgrounds to generate transient deflection shapes using the 1/3 octave wavelet transform are presented. Characteristics of the 1/3 octave wavelet transform as a tool for estimating the distribution of power of a signal with respect to time and frequency is investigated. Since it is basically an off-line digital filter, its performances as a digital filter such as roll-off slope and conservation of phase information are compared with other filters. Usefulness of the 1/3 octave wavelet transform is illustrated by its application to vibration and noise reduction of a stainless-steel plate of high modal density under impact excitation.

서지기타정보

서지기타정보
청구기호 {MME 97042
형태사항 vii, 83 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 : A, 1/3 옥타브 웨이브렛의 직교성. - B, 푸리에 변환의 정의. - C, 가상점 추정 및 경계점에서의 곡률반경 추정
저자명의 영문표기 : Sang-Hum Baik
지도교수의 한글표기 : 김광준
지도교수의 영문표기 : Kwang-Joon Kim
학위논문 학위논문(석사) - 한국과학기술원 : 기계공학과,
서지주기 참고문헌 : p. 76-77
주제 1/3 옥타브 웨이브렛 변환
과도상태 변형형상
1/3 octave wavelet transform
Transient deflection shape
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