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許南秀 진주산업대학교 1983 論文集 Vol.21 No.-
This experimental study has been carried out to investigate the coefficient of head loss due to the confluent duct fow through the T type junction in the Reynolds number ranging from 6×10 exp (4) to 10 exp (5) The main duct 50㎜ in diameter and the confluent of three kinds, respectively 50,40 and 30㎜ in diameter, which were PVC pipe, were used. The results obtained are as follows: 1. As the Reynolds number increased, head losses Δ hs were increased and as the weight flow ratio increased, head losses were decreased in case of m=1. But the range of the change of head losses due to the weight flow ratio were decreased in case of m≥1.56. 2. curves of loss coefficient according to the weight flow ratio obtained are as follows: m=1 :ζ_23=1.3303X_2^2-0.8518X_2+0.5975 m=1,56 :ζ_23=2.2045X_2^2-1.6835X_2+1.0274 m=2.78 :ζ_23=3.2359X_2^2-2.3264X_2+1.6750 3. As the area ratio increased, the least loss coefficient was increased. 4. As the area ratio increased, the loss coefficients due to the weight flow ratio changed suddenly.
許南秀 진주산업대학교 1984 論文集 Vol.22 No.-
This experimental study has been carried out to investigate the coefficient of head losses due to the dividing flow through the T type junction in the Reynolds number ranging from 3×10exp(4) to 7×10exp(4). The main and dividing ducts, which were PVC pipe, were used 30 ㎜ in diameter. The results obtained are as follows: 1. Curves of loss coefficient according to the weight flow ratio obtained are as follows: ζ_12=1.0021-0.8376X_2+1.0717X_2^2 ζ_13=0.0104-0.2658_2+0.7035X_2^2 2. Loss coefficients dont exert a great influence on the change of Reynolds number. 3. The loss coefficients of ζ_12 are higher than those of ζ_13.
許南秀,黃光性 진주산업대학교 1988 論文集 Vol.26 No.-
This paper describes the application of the variable structure control concept for electrohydraulic servomotor system with single-rod cylinder. The result of variable structure system was compared to that of the fixed structure system when system parameter variations exit. 1. Dynamic Characteristics of fixed structure system were different from operating direction of poston, but those of VSS were same approximately. 2. VSS was realized rapid response without overshoot. 3. The large gradient of switching line was reached steady state rapidly within the range of reaching condition.