日本財団 図書館


3. WAVE IMPACT SENSITIVITY ANALYSIS
 A small tanker of data as in Tab. 1 is used as an input to the simulation experiment of wave actions due to the second order forces.
 
Table 1 Ship data
L[m] = 97.4 cB[-] = 0.76
B[m] = 16.6 D[m] = 4.1
T[m] = 7.1 P/D[-] = 0.87
H[m] = 9.4 n[1/s] = 2.35
m[t] = 8950 m11 = k11m = 0.06m
Jz[tm2] = 5.2・106 m22 = k22m = 1.00m
AR[m2] = 12.3 m66 = k66Jz = 0.83Jz
λR[-] = 1.5 cm[-] = 0.8
 
 The most essential details of the ship manoeuvring mathematical model (4) constituting a basis for the simulation are presented below, which could effect the interpretation (validity) of the simulation output.
 
Rudder forces:
 
 
MzR = FyRxR (19)
 
 
vRy = c2(vy + ωzxR) (22)
 
Hull forces:
 
 
tgβ = -vy/vx, β∈<-180°,+180°> (25)
 
 
 The rudder lift and drag coefficients as functions of the rudder incidence angle and propeller thrust load are taken from [1] and shown in Figs. 1 and 2.
 
Fig.1 
Rudder lift coefficient as function of propeller thrust load coefficient.
 
Fig.2 
Rudder drag coefficient as function of propeller thrust load coefficient.
 
 The coefficient of hull surge force (ship resistance) cfxh is calculated according to:
 
cfxh = cfxho・cosβ・(1 - Ωm2 (27)
 
where cfxho is the resistance coefficient (negative) in a straight ahead motion.







日本財団図書館は、日本財団が運営しています。

  • 日本財団 THE NIPPON FOUNDATION