calcHMWaveMakingRes.Rd
Calculate wave resistance (Rw
) (kN) from the Holtrop &
Mennen method.
calcHMWaveMakingRes( lwl, breadth, Cp, Cwp, Cm, maxDisplacement, maxDraft, froudeNum, At, hb, Abt, seawaterDensity, forwardDraft, lcb = 0 )
lwl | Waterline length (vector of numericals, m) (see
|
---|---|
breadth | Moulded breadth (vector of numericals, m) |
Cp | Prismatic coefficient (vector of numericals, dimensionless) (see
|
Cwp | Water plane area coefficient (vector of numericals, see
|
Cm | Midship section coefficient (vector of numericals, dimensionless)
(see |
maxDisplacement | Maximum ship displacement (vector of numericals, m^3) |
maxDraft | Maximum summer load line draft (vector of numericals, m) |
froudeNum | Froude number (vector of numericals, dimensionless) (see
|
At | Transom area (vector of numericals, m^2) (see |
hb | Center of bulb area above keel line (vector of numericals, m) (see
|
Abt | Traverse bulb area (vector of numericals, m^2) (see
|
seawaterDensity | Sea water density. Default = 1.025 (g/cm^3). Can supply either a vector of numericals, a single number, or rely on the default |
forwardDraft | Forward draft (deviation from actual draft indicates trim) (vector of numericals, m) |
lcb | Longitudinal position of center of buoyancy (vector of numericals,
see |
Rw
(vector of numericals, kN)
Note: This calculates resistance, not a coefficient.Therefore, it does not need to be multiplied by wetted surface area like the frictional resistance coefficient is.
Note: In "A Statistical Re-Analysis of Resistance and Propulsion Data" the
authors re-analyze with the inclusion of Series 64 hull forms for a total of
334 models included in the analysis. Their original paper insufficiently
modeled high speed craft with Froude number >= 0.55, thus the original wave
making resistance equation is used for froudeNum
< 0.55 and the new
wave making resistance equation is used for froudeNum
>= 0.55. The
authors also include wave making resistance equations in the updated paper for
Froude number < 0.55, but these require more computing power and they mention
that they closely resemble the original equation. Therefore, the original
equation is used for froudeNum
< 0.55.
Extra Info:
c2
: Accounts for the reduction of the wave resistance due to action of
a bulbous bow
c5
: Represents the influence of a transom stern on the wave resistance
i_E
: The angle of the waterline at the bow in the degrees with reference
to center plane but neglecting the local shape at the stem
Holtrop, J. and Mennen, G. G. J. 1982. "An approximate power prediction method." International Shipbuilding Progress 29.
Holtrop, J. and Mennen, G. G. J. 1984. "A Statistical Re-Analysis of Resistance and Propulsion Data'.
Other Holtrop-Mennen Calculations:
calcHMAppendageRes()
,
calcHMBulbousBowRes()
,
calcHMCa()
,
calcHMFormFactor()
,
calcHMImmersedTransomRes()
,
calcHMPwr()
,
calcHMThrustFactor()
,
calcHMTotalRes()
,
calcHMWakeFraction()
,
calcHMWettedSA()
Other Resistance Calculations:
calcCf()
,
calcHMAppendageRes()
,
calcHMBulbousBowRes()
,
calcHMCa()
,
calcHMImmersedTransomRes()
,
calcHMTotalRes()
,
calcKristCaa()
,
calcKristCa()
,
calcKristCr()
,
calcKristTotalRes()
calcHMWaveMakingRes(lwl=c(218.75,209.25), breadth=c(32.25,32.20), Cp=c(0.81,0.67), Cwp=c(0.91,0.84), Cm=c(0.99,0.98), maxDisplacement=c(80097,52382.04), maxDraft=c(13.57,11.49), froudeNum=c(0,0.25), At=c(22.2,18.5), hb=c(5.43,4.6), Abt=c(32.02,27.98), seawaterDensity=1.025, forwardDraft=c(13.57,11.49))#> [1] 0.0000 402.0109