Documente online.
Username / Parola inexistente
  Zona de administrare documente. Fisierele tale  
Am uitat parola x Creaza cont nou
  Home Exploreaza
Upload




























Teoria si Constructia Navei

tehnica mecanica










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





Document Info


Accesari: 5045
Apreciat: hand-up

Comenteaza documentul:

Nu esti inregistrat
Trebuie sa fii utilizator inregistrat pentru a putea comenta


Creaza cont nou

A fost util?

Daca documentul a fost util si crezi ca merita
sa adaugi un link catre el la tine in site


in pagina web a site-ului tau.




eCoduri.com - coduri postale, contabile, CAEN sau bancare

Politica de confidentialitate




Copyright Contact (SCRIGROUP Int. 2023 )