Assigns an operating mode designation according to ship speed and engine load fraction.

calcOperatingMode(shipSpeed, loadFactor)

Arguments

shipSpeed

Vessel speed (vector of numericals, knots)

loadFactor

Fractional percentage (between 0 and 1) of main engine required to propel vessel at given speed (vector of numericals) (see ShipPowerModel library)

Value

opMode (vector of strings). Valid values are:

  • "Berth"

  • "Anchorage"

  • "Maneuvering"

  • "Transit"

Details

Calculated according to methods in IMO GHG 3.

Note: This is a simplification of the methods described in Section 3.8.5 of the Port Emissions Inventory Guidance.

References

International Maritime Organization. 2014. "Third IMO GHG study 2014 - Final report." London: International Maritime Organization.

EPA. 2020. "Port Emissions Inventory Guidance: Methodologies for Estimating Port-Related and Goods Movement Mobile Source Emissions." Ann Arbor, MI: Office of Transportation and Air Quality. US Environmental Protection Agency.

See also

ShipPowerModel library

Examples

calcOperatingMode(shipSpeed=c(0,2.5,14,20), loadFactor=c(0.02,0.06,0.15,0.75))
#> [1] "Berth" "Anchorage" "Manuevering" "Transit"