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Abstract 14
제1장 서론 20
1.1. 연구배경과 목적 20
1.2. 연구사례 25
1.3. 연구의 개요 27
제2장 현용 쌍끌이 중층망의 전개성능 29
2.1. 재료 및 방법 30
2.1.1. 모형어구 30
2.1.2. 실험수조 및 장치 36
2.1.3. 실험방법 38
2.2. 결과 및 고찰 41
2.2.1. 유체저항 41
2.2.2. 망고 및 망폭 44
2.2.3. 망구면적 및 여과량 45
2.2.4. 뜸의 부력에 따른 전개성능 47
가. 유체저항 47
나. 망고 및 망폭 49
2.3. 요약 52
제3장 無浮子 쌍끌이 중층망의 전개성능 54
3.1. 재료 및 방법 56
3.1.1. 모형어구 및 실험장치 56
3.1.2. 실험방법 58
3.1.3. 아래끌줄 길이에 따른 망고전개의 원리 60
3.2. 결과 및 고찰 61
3.2.1. 아래끌줄의 길이(dL)에 따른 전개성능 61
3.2.2. Front weight의 무게에 따른 전개성능 74
3.2.3. Wing-end weight의 무게에 따른 전개성능 81
3.3. 요약 89
제4장 카이트를 부착한 無浮子 쌍끌이 중층망의 전개성능 93
4.1. 재료 및 방법 95
4.1.1. 모형어구 95
4.1.2. 카이트의 제작 97
4.1.3. 실험수조 및 장치 100
4.1.4. 실험방법 101
4.2. 결과 및 고찰 103
4.2.1. 카이트의 면적에 따른 전개성능 103
4.2.2. Wing-end weight의 무게에 따른 전개성능 111
4.2.3. Front weight의 무게에 따른 전개성능 117
4.2.4. 아래끌줄의 길이(dL)에 따른 전개성능 125
4.3. 요약 131
제5장 종합고찰 133
참고문헌 140
감사의 글 145
Table 2-1. Value of k and n as a function of hydrodynamic resistance according to the buoyance in case of Fig.2-10 48
Table 3-1. Value of k and n as a function of hydrodynamic resistance according to dL in case of Fig. 3-3 62
Table 3-2. Value of xand y of the experimental formula (3-1) in case of Fig.3-5 67
Table 3-3. Value of k and n as a function of hydrodynamic resistance according to the front weight in case of Fig. 3-12 75
Table 3-4. Value of k and n asa function of hydrodynamic resistance according to the wing-end weight in case of Fig. 3-17 82
Table 4-1. Value of k and n asa function of hydrodynamic resistance according to the kite area in case of Fig. 4-6 107
Fig. 2-1. Drawing of the full-scale midwater pair trawl(MAT. : materal, PA : polyamide, PE : polyethylene). 32
Fig. 2-2. Schematic arrangement of head rope(a), ground rope (b) and net pendant (c) of the full scale midwater pair trawl. 33
Fig. 2-3. Drawing of the model midwater pair trawl. 34
Fig. 2-4. Schematic arrangement of head rope(a), ground rope(b) and net pendant(c) of the model midwater pair trawl(F. W : front weight) 35
Fig. 2-5. Schematic drawing of the circulation water channel. 37
Fig. 2-6. Schematic drawing of the experimental equipments(a, b : observation point of net height and width) 37
Fig. 2-7. Relationship between hydrodynamic resistance and flow speed in the commercial midwater pair trawl. 43
Fig. 2-8. Change of the net height and width according to the flow speed in the commercial midwater pair trawl. 45
Fig. 2-9. Change of the mouth area and filtering volume according to the flow speed in the commercial midwater pairt rawl. 46
Fig. 2-10. Relationship between hydrodynamic resistance and flow speed according to the buoyance in the commercial midwater pair trawl. 49
Fig. 2-11. Change of net height and width according to the buoyance in the commercial midwater pair trawl. 51
Fig. 3-1. Schematic arrangement of head rope(a), ground rope(b) and net pendant(c) of the model midwater pair trawl(F. W : front weight, W. W : wing-end weight) 57
Fig. 3-2. Schematic diagram for opening effect of height in the non-float pair trawl. 61
Fig. 3-3. Relationship between hydrodynamic resistance and flow speed according to dL in the non-float midwater pair trawl 64
Fig. 3-4. Relationship between hydrodynamic resistance acting on the lower warp and flow speed according to dL in the non-float midwater pairt rawl. 64
Fig. 3-5. Relationship between net heightand flow speed according to the lower warp length in the non-float midwater pair trawl. 68
Fig. 3-6. Relationship between net height and dL according to the flow speed in the non-float midwater pair trawl. 69
Fig. 3-7. Relationship between netwidth and flow speed according to dL in the non-float midwater pairt rawl. 69
Fig. 3-8. Relationship between netwidth and dL according to the flow speed in the non-float midwater pair trawl. 70
Fig. 3-9. Relationship between netwidth and dL according to the flow speed in the non-float pair trawl at the observation point a . 71
Fig. 3-10. Relationship between mouth area and dL according to the flow speed in the non-float midwater pairt rawl. 73
Fig. 3-11. Relationship between filtering volume and dL according to the flow speed in the non-float midwater pair trawl 73
Fig. 3-12. Relationship between hydrodynamic resistance and flow speed according to the front weight in the non-float midwater pair trawl when dL is 30m. 75
Fig. 3-13. Relationship between net heightand flow speed according to the front weight in the non-float midwater pair trawl with dL of 30m. 77
Fig. 3-14. Relationship between netwidth and flow speed according to the front weight in the non-float pair trawl with dL of 30m. 78
Fig. 3-15. Relationship between mouth area and flow speedinthe non-float pair trawl according to the front weight when dL is 30m. 80
Fig. 3-16. Relationship between filtering volume and flow speedinthe non-float pair trawl according to the front weight when dL is 30m. 80
Fig. 3-17. Relationship between hydrodynamic resistance and flow speed according to thewing-end weight in the non-float midwater pair trawl when dL is 30m and the front weight is 1.40tons. 82
Fig. 3-18. Relationship between net heightand flow speed according to the wing-end weight in the non-float midwater pair trawl when dL is 30m and the front weight is 1.40tons. 84
Fig. 3-19. Relationship between netwidth and flow speed according to the wing-end weightin the non-float midwater pair trawl when dL is 30m and the front weight is 1.40tons. 85
Fig. 3-20. Relationship between mouth area and flow speed according to the wing-end weight in the non-float midwater pair trawl when dL is 30m and the front weight is 1.40tons. 87
Fig. 3-21. Relationship between filtering volume and flow speed according to the wing-end weight in the non-float midwater pair trawl when dL is 30m and the front weight is 1.40tons. 88
Fig. 4-1. Developed drawing of the model non-float midwater pair trawl(b~g : observation points in the netside shape). 95
Fig. 4-2. Schematic arrangement of head rope(a), groundrope(b) and net pendant(c) of the model non-float midwater pair trawl(F. W : front weight, W. W : wing-end weight). 96
Fig. 4-3. Structureof the kite(a) and its suspension in the head rope(b)(①~② : attached order of the kite in the model experiment, a : head rope, b : connection line, c : netting, d : kite, e : float). 99
Fig. 4-4. Schematic drawing of the experimental equipments(a~g : observation point in the net side shape). 100
Fig. 4-5. Working depth of the model midwater pair trawl(- : partof warpand pendent, ── : netpart, ―ㆍ― : setting depth of sward) 105
Fig. 4-6. Hydrodynamic resistance(a), netheight(b) and width(c) according to the kite area in the non-float midwater pair trawl with the kite when the front weight is 1.40tons, the wing-end weight is 1.11tons and dL is 30m. 109
Fig. 4-7. Working depth of the non-float midwater pair trawl with the 4kites according to the wing-end weight when the front weight is 1.40tons and dL is 30m 112
Fig. 4-8. Hydrodynamic resistance(a), net height(b) and net width(c) according to the wing-end weightin the non-float midwater pair trawl with the 4kites when the front weight is 1.40tons and dL is 30m. 115
Fig. 4-9. Working depth of the non-float midwaterpair trawl withthe 4kites according to the front weight when the wing-end weight is 0ton and dL is 30m 118
Fig. 4-10. Total hydrodynamic resistance of net(a) and tension acting on the lower warp(b) according to the front weight in the non-float midwater pair trawl with the 4kites when the wing-end weight is 0ton and dL is 30m. 122
Fig. 4-11. Net height(a) and width(b) according to the front weight in the non-float midwater pair trawl with the 4kites when the wing-end weight is 0ton and dL is 30m. 124
Fig. 4-12. Working depth of the non-float midwater pair trawl with the 4kites according to dL when the front weight is 1.40tons and the wing-end weight is 0ton at 4.0knots 126
Fig. 4-13. Opening efficiency according to dL in the non-float midwater pair trawl with the 4kite swhen the front weight is 1.40tons and the wing-end weight is 0ton at 4.0knots. 127
Fig. 4-14. Relationship between filtering volume and flow speed. 129
Fig. 4-15. Relationship between hydrodynamic resistance permouth area and flow speed in the non-float midwater pair trawl with the 4kites when dL is 30m and the wing-end weight is 0ton. 130
Photo. 1-1. Net drum in the commercial midwater pair trawler. 23
Photo. 1-2. Process of hauling in the commercial midwater pair trawler 24
Photo. 2-1. Side view (a) and upper view (b) of vertical circulation water channel. 36
Photo. 2-2. Observation of net height and width in the model net. 39
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