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40 mm 화포용 베플형 소음기와 천공형 소음기에 대한 수치해석적 비교 연구
강태엽(T. Y. Kang),김상민(S. M. Kim),이해석(H. S. Lee),나태흠(T. H. Na),한태호(T. H. Han) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
In this study, flow characteristics of baffle type and perforated type silencers for 40 mm caliber cannons were numerically investigated and noise attenuation effects provided by each silencer were compared. Numerical analysis was conducted by using a commercial CFD code, FLUENT. To analyze complex blast flow fields, the Spalart-Allmaras model was applied under 2 dimensional and axisymmetric conditions. In result, 6.4 % reduction in sound, pressure level(SPL) was obtained by the baffle type silencer, 4.3 % by the perforated type on average.
문석표(S. P. Moon),한태호(T. H. Han),최창현(C. H. Choi),김용주(Y. J. Kim) 유공압건설기계학회 2019 유공압건설기계학회 학술대회논문집 Vol.2019 No.11
In Korea, automatic transmissions are developed for the convenience of operating agricultural machinery. The automatic transmission conduct a role of increasing the power efficiency of agricultural machinery as well as the convenience of operation. Hydrostatic transmission is one of automatic transmissions and is often used in agricultural machinery like tractor, harvester. Accurate durability test is required to produce high quality automatic transmissions. Accelerated life tests are conducted for endurance life tests in Korea. The purpose of this study is to calculate the equivalent load in the plow tillage of a tractor with hydrostatic transmission. For this study, a pressure sensor was installed on a tractor using a hydrostatic transmission to measure load data. The equivalent load was calculated from the measured load. In the future, other agricultural will be conducted such as rotary operation and calculate the integrated equivalent load. The integrated equivalent load data can be applied to the accelerated life test.