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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 국제구조공학회 Structural Engineering and Mechanics, An Int'l Journal Structural Engineering and Mechanics, An Int'l Journal Vol.75 No.4
- 발행연도
- 2020.1
- 수록면
- 425 - 434 (10page)
이용수
초록· 키워드
오류제보하기
Practical non-synoptic fluctuating wind often exhibits nonstationary features and should be modeled as nonstationary random processes. Generally, the coherence function of the fluctuating wind field has time-varying characteristics. Some studies have shown that there is a big difference between the fluctuating wind field of the coherent function model with and without time variability. Therefore, it is of significance to simulate nonstationary fluctuating wind field with time-varying coherent function. However, current studies on the numerical simulation of nonstationary fluctuating wind field with time-varying coherence are very limited, and the proposed approaches are usually based on the traditional spectral representation method with low simulation efficiency. Especially, for the simulation of multi-variable wind field of large span structures such as transmission tower-line, not only the simulation is inefficient but also the matrix decomposition may have singularity problem. In this paper, it is proposed to conduct the numerical simulation of nonstationary fluctuating wind field in one-spatial dimension with time-varying coherence based on the wavenumber-frequency spectrum. The simulated multivariable nonstationary wind field with time-varying coherence is transformed into one-dimensional nonstationary random waves in the simulated spatial domain, and the simulation by wavenumber frequency spectrum is derived. So, the proposed simulation method can avoid the complicated Cholesky decomposition. Then, the proper orthogonal decomposition is employed to decompose the time-space dependent evolutionary power spectral density and the Fourier transform of time-varying coherent function, simultaneously, so that the two-dimensional Fast Fourier transform can be applied to further improve the simulation efficiency. Finally, the proposed method is applied to simulate the longitudinal nonstationary fluctuating wind velocity field along the transmission line to illustrate its performances.
목차
등록된 정보가 없습니다.
참고문헌 (30)
참고문헌 신청
Bao, X. / 2019 / Fast simulation of non-stationary wind velocity based on time-frequency interpolation / J. Wind Eng. Ind. Aerodyn. 193:103982
Bao, X. / 2020 / Application of Time-Frequency Interpolation and Proper Orthogonal Decomposition in Nonstationary Wind-Field Simulation / J. Eng. Mech 146(5):04020034
Benowitz, B. A. / 2015 / Simulation of wind velocities on long span structures : a novel stochastic wave based model / J. Wind Eng. Ind. Aerod 147:154~163
Chen, J. B. / 2018 / Simulation of Homogeneous Fluctuating Wind Field in Two Spatial Dimensions via a Joint Wave Number-Frequency Power Spectrum / J. Eng. Mech 144(11):04018100
Deodatis, G. / 1989 / Simulation of Seismic Ground Motion Using Stochastic Waves / J. Eng. Mech 115(12):2723~2737
Bao, X. / 2020 / Application of Time-Frequency Interpolation and Proper Orthogonal Decomposition in Nonstationary Wind-Field Simulation / J. Eng. Mech 146(5):04020034
Benowitz, B. A. / 2015 / Simulation of wind velocities on long span structures : a novel stochastic wave based model / J. Wind Eng. Ind. Aerod 147:154~163
Chen, J. B. / 2018 / Simulation of Homogeneous Fluctuating Wind Field in Two Spatial Dimensions via a Joint Wave Number-Frequency Power Spectrum / J. Eng. Mech 144(11):04018100
Deodatis, G. / 1989 / Simulation of Seismic Ground Motion Using Stochastic Waves / J. Eng. Mech 115(12):2723~2737
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