• 제목/요약/키워드: frequency-wavenumber

검색결과 74건 처리시간 0.034초

단순지지 사각 접수 평판의 방사효율 근사식에 관한 연구 (A Study on the Approximate Formula for Radiation Efficiency of a Simply Supported Rectangular Plate in Water)

  • 김현실;김재승;김봉기;김상렬
    • 한국소음진동공학회논문집
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    • 제24권1호
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    • pp.21-27
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    • 2014
  • In this paper, an approximate formula for radiation efficiency of the plate surround by an infinite rigid baffle is studied. The plate is simply supported and one side is in contact with air, while other side with water. By assuming an infinite plate, the fluid loading effect is derived in terms of an effective mass. Based on the observation that the fluid loading effect decreases as frequency increases, the radiation efficiency formula at high frequency, which was originally derived for a plate vibrating in the air, is modified as the approximate formula for a submerged plate. The fluid loading effect is taken into account in the wavenumber of the plate. Comparisons of the approximate formula with the numerical results shows that they match well except the mid-frequency range in which numerical results show many oscillations. In numerically solving the fully coupled equations of motion, fourfold integrals of the impedance coefficients are reduced to single nonsingular integrals, which results in substantial reduction in computing time.

다수의 음원을 사용한 공간의 소리 제어 방법론 (Spatial Manipulation of Sound Using Multiple Sources)

  • 최정우;김양한;박영진
    • 한국소음진동공학회논문집
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    • 제15권12호
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    • pp.1378-1388
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    • 2005
  • Spatial control of sound is essential to deliver better sound to the listener's position in space. As it can be experienced in many listening environments. the quality of sound can not be manifested over every Position in a hall. This motivates us to control sound in a region we select. The primary focus of the developed method has to do with the brightness and contrast of acoustic image in space. In particular, the acoustic brightness control seeks a way to increase loudness of sound over a chosen area, and the contrast control aims to enhance loudness difference between two neighboring regions. This enables us to make two different kinds of zone - the zone of quiet and the zone of loud sound - at the same time. The other perspective of this study is on the direction of sound. It is shown that we can control the direction of perceived sound source by focusing acoustic energy in wavenumber domain. To begin with, the proposed approaches are formulated for pure-tone case. Then the control methods are extended to a more general case, where the excitation signal has broadband spectrum. In order to control the broadband signal in time domain, an inverse filter design problem is defined and solved in frequency domain. Numerical and experimental results obtained in various conditions certainly validate that the acoustic brightness, acoustic contrast, direction of wave front can be manipulated for some finite region in space and time.

2차원 중합전 일반화된-막 구조보정 (2D Prestack Generalized-screen Migration)

  • 송호철;설순지;변중무
    • 지구물리와물리탐사
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    • 제13권4호
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    • pp.315-322
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    • 2010
  • 위상막 구조보정과 split-step Fourier 구조보정은 주파수-파수, 주파수-공간 영역에서 단방향 파동방정식을 이용하여 빠른 계산 속도로 수평적 속도변화를 고려할 수 있는 구조보정이다. 일반화된-막(generalized-screen) 구조보정은 주파수-파수영역에서 수직전파를 가정하는 위의 두 구조보정과는 달리 수직전파를 가정하지 않고, 지수함수의 무한급수 전개를 이용한다. 또한 수직느리기항의 테일러 급수전개를 일반화하여 고차항을 추가함으로써 급격한 속도변화를 갖는 지하구조에서 넓은 각으로 전파하는 파동장에 대한 정확도를 향상시켰다. 이 논문은 다양한 경사와 급격한 속도변화를 포함하는 복잡한 지하구조를 효율적으로 보다 정확하게 영상화하기 위하여 2차원 일반화된-막 구조보정에 대하여 연구하였다. 일정한 미소변량(constant perturbation)을 갖는 매질과 SEG/EAGE 암염돔을 모사한 모델에 대하여 일반화된-막 전파자와 위상막 전파자의 전파된 파동장을 비교한 결과, 일반화된-막 전파자가 파동장의 넓은각 전파에 대해 위상막 전파자보다 높은 정확도를 보였다. 또한 일반화된-막 전파자의 차수를 증가시킬수록 넓은 각으로 전파하는 파동장의 정확도가 향상되었다. 큰 수평적 속도변화와 급경사를 갖는 모델과 SEG/EAGE 암염돔 합성 탄성파탐사 자료에 대하여 일반화된-막 구조보정과 위상막 구조보정을 적용한 결과, 일반화된-막 구조보정이 속도변화가 크고 급격한 경사를 갖는 반사면을 보다 정확한 위치에 뚜렷하게 영상화하였다.

FCC구조에서 포논분산과 비열 (Phonon Dispersion and Specific Heat in FCC Structure)

  • 정재동;이경태
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2004년도 추계학술대회
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    • pp.1207-1212
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    • 2004
  • A model for the phonon dispersion relationship for cubic zinc sulfide structure, for example SiC, is developed in terms of two unknown force constants. Born model that incorporates bond bending and bond stretching, is used for the force constants. The force constants are determined by fitting to experimental data. Using only the nearest-neighbor coupling results in $6{\times}6$ sized dynamic matrix. The eigenvalues of dynamics matrix for each wavenumber in 3-D ${\kappa}$ space correspond to frequencies, 3 for optical phonon and 3 for acoustic phonon, which is so-called dispersion relation (${\kappa}$-${\omega}$). The density of state is determined by counting the states for each frequency bin, and the properties such as specific heat and thermal conductivity can be obtained. The specific heat is estimated on this model and compared with experiment and other models, i.e. Debye model, Einstein model and combined Debye-Einstein model. In spite of the simple bond potential model, reasonable agreements are found.

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난류 경계층 내 벽면 변동 압력의 구조 기진력 모델링 (A Modelling of Structural Excitation Forces Due to Wall Pressure Fluctuations in a Turbulent Boundary Layer)

  • 홍진숙;신구균;김상윤
    • 소음진동
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    • 제11권2호
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    • pp.226-233
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    • 2001
  • It is essential to analyze structural vibrations due to turbulent wall pressure fluctuations over a body surface which moves through a fluid, because the vibrations can be a severe source of noise affecting to passengers in airplanes and SONAR performance. Generally, this kind of problems have been solved for very simplified models, e.g. plates, which can be applied to the wavenumber domain analysis. In this paper, a finite element modeling of the walt pressure fluctuations is investigated, which can be applied to those over arbitrary smooth surfaces. It is found that the modeled wall pressure fluctuation at nodes becomes uncorrelated at higher frequencies and at lower flow speeds, and the response is over-estimated due to the aliased power. Then the frequency range available for uncorrelated loading model and two power correction schemes are presented.

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Wavenumber Correlation Analysis of Statellite Geopotential Anomalies

  • Kim, Jeong-Woo;Kim, Won-Kyun;Kim, Hye-Yun
    • 자원환경지질
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    • 제33권2호
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    • pp.111-116
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    • 2000
  • Indentifying anomaly correlations between data sets is the basis for rationalizig geopotential interpretation and theory. A procedure is presented that constitutes an effective process for identifying correlative features between the two or more geopotential data sets. Anomaly features that show direct, inverse, or no correlations between the data may be separated by applying filters in the frequency domains of the data sets. The correlation filter passes or rejects wavenumbers between co-registered data sets based on the correlation coefficient between common wavenumbers as given by the cosine of their phase difference. This study includes an example of Magsat magnetic anomaly profile that illustrates the usefulness of the procedure for extracting correlative features between the data sets.

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난류 경계층에서 컴플라이언트 코팅과 점탄성 벽면의 방사 소음에 관한 실험적 연구 (Radiated Sound from Compliant and Viscoelastic Plates in a Turbulent Boundary Layer)

  • 이승배;이창준;권오섭;전우평
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2002년도 학술대회지
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    • pp.779-782
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    • 2002
  • We examine the problem in which porous/viscoelastic compliant thin plates are subject to pressure fluctuations under transitional or turbulent boundary layer. Measurements are presented of the frequency spectra of the near-field pressure and radiated sound by compliant surface. A porous plate consisting of 5mm thick, open-cell foam with fabric covering and a viscoelastic painted plate of 1mm thick over an acoustic board of 4m thick were placed over a rigid surface in an anechoic wind tunnel. Streamwise velocity and wall pressure measurements were shown to highly attenuate the convective wall pressure energy when the convective wavenumber ($k_{ch}$) was 3.0 or more. The sound source localization on the compliant walls is applied to the measurement of radiated sound by using an acoustic mirror system.

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3차원 다층 반무한상 구조물의 동적 간섭에 관한 해석적 연구 (Three Dimensional Dynamic Interaction of Foundations on Layered Half-Space)

  • 조우연;이강원;임윤묵;김문겸
    • 한국지진공학회:학술대회논문집
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    • 한국지진공학회 2001년도 추계 학술발표회 논문집 Proceedings of EESK Conference-Fall 2001
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    • pp.75-82
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    • 2001
  • A dynamic interaction analysis of an adjacent surface fecundation on a layered half-space is performed in the frequency domain. A semi-analytical approach is employed to reduce the integration range of the wavenumber in the surface fundamental solution for a layered half-space in boundary element (BE) formulations. The present study then adopts a combined boundary and finite element method to analyze the dynamic behavior of a system of flexible surface foundations on an elastic homogeneous and layered half-space. Numerical examples are presented to demonstrate the accuracy of the developed method. The examples show the feasibility of an extended application fur the complicated dynamic interaction of foundations on layered media.

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유체 충진 탄성호스 내의 길이 방향 파동 전파속도에 관한 실험적 규명 (Experimental Identification of the Longitudinal Wave Propagation Speed in Fluid-filled Elastic Hose)

  • 권오조;조치영
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2000년도 춘계학술대회논문집
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    • pp.804-810
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    • 2000
  • In this paper, an experimental identification method is presented to identify the bulge wave and extensional wave propagation speeds in the fluid-filled elastic hose. An fluid-filled hose is hanged vertically for straight position. The exciting device of piston type is developed to generate the bulge wave and extensional wave in the elastic hose. Hydrophones are arranged in the fluid-filled hose linearly to measure the wave pressure. The wave speeds are estimated using the wavenumber-frequency spectrum analysis technique.

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난류 경계층 내 벽면 변동 압력의 구조 기진력 모델링 (A Modelling of Structural Excitation Forces Due to Wall Pressure Fluctuations in a Turbulent Boundary Layer)

  • 홍진숙;신구균
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2000년도 춘계학술대회논문집
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    • pp.817-824
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    • 2000
  • It is essential to analyze structural vibrations due to turbulent wall pressure fluctuations over a body surface which moves through a fluid, because the vibrations can be a severe source of noise affecting to passengers in airplanes and SONAR performance. Generally, this kind of problems have been solved for very simplified models, e.g. plates, which can be applied to the wavenumber domain analysis. In this paper, a finite element modeling of the wall pressure fluctuations over arbitrary smooth surfaces is investigated. It is found that the modeled wall pressure fluctuation at nodes becomes uncorrelated at higher frequencies and at lower flow speeds, and the response is over-estimated due to the aliased power. Finally, the frequency range available for uncorrelated loading model and two power correction schemes are presented.

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