ACADEMIA NAVALA "MIRCEA CEL BATRAN"
FACULTATEA DE MARINA CIVILA
ELECTROMECANICA
Teoria si Constructia Navei
Tema 1
Determinarea rezistentei la inaintare prin experiment pe modele
Student:
Grupa: 352 C
Notiuni Teoretice:
Determinarea rezistentei la inaintare prin experiment pe modele
Se tracteaza modelul cu viteza 
determinata din criteriul de
similitudine Froude
Se masoara rezistenta la inaintare a modelului cu dinamometru RTm;
Se calculeaza coeficientul rezistentei totale a modelului
Se calculeaza numarul Reynolds pentru model
Se calculeaza coeficientul rezistentei de frecare pentru model
CFm=0,075/(lgRem-2)2,ITTC-57;
Se calculeaza coeficientul rezistentei reziduale pentru model care, prin criteriul de similitudine Froude este acelasi si pentru nava
Se calculeaza coeficientul rezistentei la inaintare datorita aerului
unde ATN este aria sectiunii transversale imerse a navei;
Se calculeaza coeficientul rezistentei totale a navei
Se calculeaza rezistenta la inaintare totala a navei
Se calculeaza puterea de remorcare a navei
Diagrama de variatie a rezistentei la inaintare si a puterii de remorcare cu viteza navei
Prismatic coefficient : 0.6000
Input variables
General
Start speed : 13.00 kn
End speed : 17.00 kn
Speed step : 0.50 kn
Water density : 1.025 t/m^3
Water viscosity : 1.6100*10^(-6) m^2/s
Hull
Length on waterline : 159.600 m
Beam on waterline : 24.320 m
Draught on midship : 7.068 m
Draught on F.P. : 7.068 m
Draught on F.A. : 7.068 m
Wetted surface area : 4.21619E06 m^2 (Estimated)
Waterplane area : 2736.00 m^2
Displacement : 199338.000 m^3
Longitudinal center of buoyancy : 0.000 %
Prismatic coefficient : 0.6000
Appendages areas:
Shaft brackets area : 0.000 m^2
Strut bossing area : 0.000 m^2
Hull bossing area : 0.000 m^2
Stabiliser fins area : 0.000 m^2
Dome area : 0.000 m^2
Exposed shafts area:
Angle vs buttoks about 10 ° : 0.000 m^2
Angle vs buttoks about 20 ° : 0.000 m^2
Areas of keels
Skeg : 0.000 m^2
Bilge keels : 0.000 m^2
Areas of rudders
Rudder behind skeg/stern : 0.000 m^2
2-screw rudder slender/thick : 0.000 m^2
Calculated variables
Cp = 0.6000
Cb = 0.0495
Cwp = 0.7049
Cm = 0.0826
Cbt = 0.0000
Am = 14.19 m^2
Lwl/Bwl = 6.563
Bwl/T = 3.441
Lwl/T = 22.581
Final calculations of resistance Holtrop
| Speed | Speed | Fr | R_f | R_r | R_T | Power | w | t |
| [kn] | [m/s] | [-] | [kN] | [kN] | [kN] | [kW] | [-] | [-] |
R_Te = 0.00 kN
Ne = 0.00 kW
w = -0.0705
t = -0.0550
nr = 0.977
Cp_opt = 0.000
Lcb_opt = 0.000 %
Note: Coefficients (w,t,nr,Cp_opt,Lcb_opt) are calculated for speed v =17.00 knots
Prismatic coefficient : 0.7000
Input variables
General
Start speed : 13.00 kn
End speed : 17.00 kn
Speed step : 0.50 kn
Water density : 1.025 t/m^3
Water viscosity : 1.6100*10^(-6) m^2/s
Hull
Length on waterline : 159.600 m
Beam on waterline : 24.320 m
Draught on midship : 7.068 m
Draught on F.P. : 7.068 m
Draught on F.A. : 7.068 m
Wetted surface area : 2.46639E06 m^2 (Estimated)
Waterplane area : 2736.00 m^2
Displacement : 199338.000 m^3
Longitudinal center of buoyancy : 0.000 %
Prismatic coefficient : 0.7000
Appendages areas:
Shaft brackets area : 0.000 m^2
Strut bossing area : 0.000 m^2
Hull bossing area : 0.000 m^2
Stabiliser fins area : 0.000 m^2
Dome area : 0.000 m^2
Exposed shafts area:
Angle vs buttoks about 10 ° : 0.000 m^2
Angle vs buttoks about 20 ° : 0.000 m^2
Areas of keels
Skeg : 0.000 m^2
Bilge keels : 0.000 m^2
Areas of rudders
Rudder behind skeg/stern : 0.000 m^2
2-screw rudder slender/thick : 0.000 m^2
Calculated variables
Cp = 0.7000
Cb = 0.0674
Cwp = 0.7049
Cm = 0.0963
Cbt = 0.0000
Am = 16.56 m^2
Lwl/Bwl = 6.563
Bwl/T = 3.441
Lwl/T = 22.581
Final calculations of resistance Holtrop
| Speed | Speed | Fr | R_f | R_r | R_T | Power | w | t |
| [kn] | [m/s] | [-] | [kN] | [kN] | [kN] | [kW] | [-] | [-] |
R_Te = 0.00 kN
Ne = 0.00 kW
w = -0.0645
t = -0.0492
nr = 0.988
Cp_opt = 0.000
Lcb_opt = 0.000 %
Note: Coefficients (w,t,nr,Cp_opt,Lcb_opt) are calculated for speed v =17.00 knots
Prismatic coefficient : 0.8000
Input variables
General
Start speed : 13.00 kn
End speed : 17.00 kn
Speed step : 0.50 kn
Water density : 1.025 t/m^3
Water viscosity : 1.6100*10^(-6) m^2/s
Hull
Length on waterline : 159.600 m
Beam on waterline : 24.320 m
Draught on midship : 7.068 m
Draught on F.P. : 7.068 m
Draught on F.A. : 7.068 m
Wetted surface area : 1.55363E06 m^2 (Estimated)
Waterplane area : 2736.00 m^2
Displacement : 199338.000 m^3
Longitudinal center of buoyancy : 0.000 %
Prismatic coefficient : 0.8000
Appendages areas:
Shaft brackets area : 0.000 m^2
Strut bossing area : 0.000 m^2
Hull bossing area : 0.000 m^2
Stabiliser fins area : 0.000 m^2
Dome area : 0.000 m^2
Exposed shafts area:
Angle vs buttoks about 10 ° : 0.000 m^2
Angle vs buttoks about 20 ° : 0.000 m^2
Areas of keels
Skeg : 0.000 m^2
Bilge keels : 0.000 m^2
Areas of rudders
Rudder behind skeg/stern : 0.000 m^2
2-screw rudder slender/thick : 0.000 m^2
Calculated variables
Cp = 0.8000
Cb = 0.0881
Cwp = 0.7049
Cm = 0.1101
Cbt = 0.0000
Am = 18.93 m^2
Lwl/Bwl = 6.563
Bwl/T = 3.441
Lwl/T = 22.581
Final calculations of resistance Holtrop
| Speed | Speed | Fr | R_f | R_r | R_T | Power | w | t |
| [kn] | [m/s] | [-] | [kN] | [kN] | [kN] | [kW] | [-] | [-] |
R_Te = 0.00 kN
Ne = 0.00 kW
w = -0.0577
t = -0.0425
nr = 0.999
Cp_opt = 0.000
Lcb_opt = 0.000 %
Note: Coefficients (w,t,nr,Cp_opt,Lcb_opt) are calculated for speed v =17.00 knots
Prismatic coefficient : 0.9000
General
Start speed : 13.00 kn
End speed : 17.00 kn
Speed step : 0.50 kn
Water density : 1.025 t/m^3
Water viscosity : 1.6100*10^(-6) m^2/s
Hull
Length on waterline : 159.600 m
Beam on waterline : 24.320 m
Draught on midship : 7.068 m
Draught on F.P. : 7.068 m
Draught on F.A. : 7.068 m
Wetted surface area : 4152.09 m^2 (Estimated)
Waterplane area : 2736.00 m^2
Displacement : 19338.000 m^3
Longitudinal center of buoyancy : 0.000 %
Prismatic coefficient : 0.9000
Appendages areas:
Shaft brackets area : 0.000 m^2
Strut bossing area : 0.000 m^2
Hull bossing area : 0.000 m^2
Stabiliser fins area : 0.000 m^2
Dome area : 0.000 m^2
Exposed shafts area:
Angle vs buttoks about 10 ° : 0.000 m^2
Angle vs buttoks about 20 ° : 0.000 m^2
Areas of keels
Skeg : 0.000 m^2
Bilge keels : 0.000 m^2
Areas of rudders
Rudder behind skeg/stern : 0.000 m^2
2-screw rudder slender/thick : 0.000 m^2
Calculated variables
Cp = 0.9000
Cb = 0.7049
Cwp = 0.7049
Cm = 0.7832
Cbt = 0.0000
Am = 134.63 m^2
Lwl/Bwl = 6.563
Bwl/T = 3.441
Lwl/T = 22.581
Final calculations of resistance Holtrop
| Speed | Speed | Fr | R_f | R_r | R_T | Power | w | t |
| [kn] | [m/s] | [-] | [kN] | [kN] | [kN] | [kW] | [-] | [-] |
R_Te = 0.00 kN
Ne = 0.00 kW
w = 0.1509
t = 0.1580
nr = 1.010
Cp_opt = 0.000
Lcb_opt = 0.000 %
Note: Coefficients (w,t,nr,Cp_opt,Lcb_opt) are calculated for speed v =17.00 knots
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