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현수교 PWS 및 CFRC 행어로프의 내풍안정성 실험 평가
박형기,강선진,Park, Hyung-Ghee,Kang, Seon-Jin 한국방재학회 2008 한국방재학회논문집 Vol.8 No.6
In this study, to evaluate the aerodynamic stability of suspension bridge hanger ropes, the wind tunnel tests are carried out. It is found that the vortex induced vibration is detected only in single PE-coated PWS cable case. And the wake galloping is occurred in twin cables spaced $3\sim6$ cable diameters of cable center to center when the incidence angle of wind is only zero degree. In case of other incidence angles of wind except zero degree, the wake galloping or the wake flutter are showed in twin cables even outside range of the bounds of $3\sim6$ cable diameters. CFRC cable shows very stable for the twin cables regardless of the distance between two cables, and also for various incidence angles of wind. Thus the characteristic of CFRC rope overwhelms one of PWS cable in aerodynamic stability. 이 연구에서는 현수교 PWS 및 CFRC 행어로프의 바람에 의한 내풍안정성 평가을 위한 풍동실험을 수행하였다. 풍동실험결과, PE관으로 피복된 PWS 케이블은 단일 케이블에서 와류진동이 발생하고 복수 케이블에서는 중심간격이 $3\sim6D$일때 웨이크갤로핑이 발생하였다. 진동이 발생하지 않는 복수 케이블에서도 풍향각이 달라지면 웨이크갤로핑이나 웨이크플러터가 발생함을 알 수 있었다. CFRC 케이블은 케이블 중심간격 및 풍향각에 관계없이 PWS 케이블에 비해 안정된 내풍성능을 보였다.
현수교 PWS 및 CFRC 행어로프의 내풍안정성 실험 평가
박형기,강선진 한국방재학회 2008 한국방재학회논문집 Vol.08 No.06
In this study, to evaluate the aerodynamic stability of suspension bridge hanger ropes, the wind tunnel tests are carried out. It is found that the vortex induced vibration is detected only in single PE-coated PWS cable case. And the wake galloping is occurred in twin cables spaced 3~6 cable diameters of cable center to center when the incidence angle of wind is only zero degree. In case of other incidence angles of wind except zero degree, the wake galloping or the wake flutter are showed in twin cables even outside range of the bounds of 3~6 cable diameters. CFRC cable shows very stable for the twin cables regardless of the distance between two cables, and also for various incidence angles of wind. Thus the characteristic of CFRC rope overwhelms one of PWS cable in aerodynamic stability. 이 연구에서는 현수교 PWS 및 CFRC 행어로프의 바람에 의한 내풍안정성 평가을 위한 풍동실험을 수행하였다. 풍동실험결과, PE관으로 피복된 PWS 케이블은 단일 케이블에서 와류진동이 발생하고 복수 케이블에서는 중심간격이 3~6D일때 웨이크갤로핑이 발생하였다. 진동이 발생하지 않는 복수 케이블에서도 풍향각이 달라지면 웨이크갤로핑이나 웨이크플러터가 발생함을 알 수 있었다. CFRC 케이블은 케이블 중심간격 및 풍향각에 관계없이 PWS 케이블에 비해 안정된 내풍성능을 보였다.
돈의 축적지방 함량이 돈육품질에 미치는 영향 1 . 돈의 축적지방이 PSE 돈육 발생에 미치는 영향
박형기,이문준,오동환 ( H . K . Park,M . J . Lee,D . H . Oh ) 한국축산학회 1985 한국축산학회지 Vol.27 No.12
In order to find out the effects of the amount of deposited fat on the pork quality, the factors affecting the PSE porcine muscle were investigated. The results are summarized as follows; 1. Of 10,993 experimental swine, 4,225 individuals (38.6%) had PSE porcine muscle. 2. Severe stress by the high temperature which the pigs were exposed to before slaughter became a direct cause of the occurence of the PSE porcine muscle. 3. The PSE porcine muscle occured more often in the heavy carcass weight and in the male. 4. The incidence of the PSE porcine muscle were higher in swine which had a thick backfat. 5. The incidence of the PSE porcine muscle showed almost no correlation with the loin-eye area. 6. The price of carcass at whole sale market was determined according to backfat thickness and intramuscular fat.