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황대웅(Hwang, Dae-Woong),서성훈(Seo, Seong-Hoon),권현웅(Kwon, Hyun-Wung),홍석윤(Hong, Suk-Yoon) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.7
PFA (power flow analysis) has been recognized as a useful method in vibration analysis of medium-to-high frequency ranges. Until now, PFA method has been developed for steady-state vibration problems. In this paper, PFA method has been expanded to transient problem. New energy governing equations are derived considering time dependent terms in beam and plate. Analytic solutions of those equations are found in simple beam and plate, and are verified by comparing with modal solutions.
최요셉(Yo-Seb Choi),홍석윤(Suk-Yoon Hong),송지훈(Jee-Hun Song),권현웅(Hyun-Woong Kwon),최원석(Woen-Sug Choi),정철민(Chul-Min Jung) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.10
The latest research has shown that the turbulence-induced noise is important in total characteristics of flow noise. Also, turbulence-induced noise have a significant influence for performance of sonar dome. In this paper, Flow analysis is performed on vicinity of the sonar dome model using Large Eddy Simulation method. Also, direct method that extracts perturbational sound pressure, FW-H method without turbulence-induced noise and permeable FW-H method that is able to calculate turbulence- induced noise were compared in order to show turbulence effect.