3. Under the supervision of ,Associate Professor Dr. Goutam Kumar Saha Project Submitted By NasifRahman 0512014 GolamMortuja 0512019 EmdadRussel 0512026
4. Presentation includes: Stability & Trim Calculations Resistance & Power calculations Engine selection Rudder Design & Steering Arrangement Propeller & Shaft design Principal Particulars General Arrangements Lines plan Hydrostatic calculations Scantling Shell Expansion Longitudinal Constructions Weight calculations
70. Trim calculation LCB at LWL =1.162 m fowd. of amidships LCG of total ship = 1.4132m fwd of amidships Load Displacement of the ship = 2240.025 tones At LWL,MCT1m = 3672.3tones. C.F. = 0.621m fwd amidships & Draft = 3 m. Now, Amount of trim= [1.162-(-1.4132)]X 2240.025 / 3672.3 m. = 1.570 m. So, change in trim forward = ( 1.570 – 0.798) m = 0.772 m. Change in trim aft = (l / L)*Change of trim = {(37+.621) / 74 }*1.570 m. =0.798 m.
85. ENGINE & gear Standard Power Rating Air Temp. 25C Sea Water Temp. 25C Rated Power 900 KW Bhp 1206 rpm 2000 Displacement : 2150 cu in Rating Conditions : ISO 3046 Description : Charge air cooled turbocharged Governor MDEC, DDEC Port Model R1627M21, 7K21 Starboard Model R1627M20, 7K20 Company: MTU Technology ,USA Model: 6V2000M60 Propeller speed: 450 rpm Gear ratio: 4:1 Company: wartsila
88. A= (LBP*H)/60 m2 = 3.60 m² Rudder Area Calculation From GL, A = C1×C2×C3×C4× (L×T×1.75)/100 m² = 3.78 m² By Robert Taggart A = (T*L/100) [1+ (B/L) 2 ] m2 = 2.23 m² As larger the area better for the maneuvering A = 3.78 m²
100. Propeller design CALCULATION OF PROPELLER DIAMETER AND PITCH USING BP – δ The maximum permissible diameter of the propeller would be , DP (max) = 0.7 x draft of ship = 0.7 x 3 , [draft = 3 m ] = 2.1 m We need the following data for the calculation of propeller diameter – Brake power of Engine, PB =884 kW Speed of the vessel, VS = 11 knots Shaft rpm, N = 1800/5.00 = 450 Propeller Type: Fixed Pitch Propeller (FPP) No of blades of propeller, Z = 4 Expanded blade area ratio, AE / AO = 0.55 Now, Delivered power, PD = PB (1 – 0.03) kW [3% shaft loss] = 884 X (1 – 0.03) kW = 857 kW
101. Velocity of advance, VA = VS (1 - wt) [wt = Tailor wake fraction = 0.195] = 8.855 knots Now, BP = {N X √ (1.34 X PD)} / VA 2.5 = 62.75 From BP – δ diagram, when, BP = 34.177, δo = 233 We get, PO / DO = 0.58 Now, δo= 3.28 X N X DO / VA = 300 So,DO = 1.82 m This is less than maximum permissible 2.1 m & PO = 1.82 X 0.58 = 1.0556 m Where, ar = distance between leading edge and generator line at r br = distance between leading edge and location of maximum thickness cr = chord length of blade section at radius r sr = maximum blade section thickness at radius r
102. CALCULATION OF PITCH AT DIFFERENT SECTION: Here, PB / DB = 0.7368 Where, DB = 1.178 m So, PB at 0.6 R, 0.8 R & 1.0 R = 0.868 m At 0.2 R, PB = (82.2% of PB at 1.0 R) = 0.713 m At 0.4 R, PB = (95 % of PB at 1.0 R) = 0.8246 m CALCULATION OF PITCH ANGLE AT DIFFERENT SECTION: We know, tanφ =P / 2πr Where, φ = pitch angle P= pitch at different section Now, using the above formula pitch angle at different section is given below Now using the pitch angle and other data; side elevation, pitch diagram & transverse view is drawn.
