afpt (version 1.1.0.4)

computeFlightPerformance: Compute characteristics of a power curve

Description

This function calculates the basic characteristic flight speeds for bird.

Usage

computeFlightPerformance(bird, ..., length.out=10)

Value

birdWSName

variable name in work-space of the bird object

bird

bird object

table

table with characteristic speeds

maxClimb

table with climb performance

powercurve

power curve from minimum to maximum speed of length lenght.out

Arguments

bird

description of the bird or bat, constructed using the Bird function

...

various optional arguments that are passed on to other functions; see details

length.out

length of calculated power curve; set length.out=0 to not compute a power curve

Author

Marco Klein Heerenbrink

Details

Optional arguments can be provided through .... These can be arguments of computeFlappingPower, e.g. strokeplane, frequency, etc., or arguments for findMaximumRangeSpeed, e.g. windSpeed and windDir. The latter will only affect the outcome of the maximum range speed, and should perhaps not be analysed through the current function...

References

Klein Heerenbrink, M., Johansson, L. C. and Hedenström, A. (2015) Power of the wingbeat: modelling the effects of flapping wings in vertebrate flight. Proc. R. Soc. A 471, 2177 tools:::Rd_expr_doi("10.1098/rspa.2014.0952")

See Also

Bird, computeFlappingPower

Examples

if (FALSE)  # computationally intensive

## Define a bird:
myBird = Bird(
    name = "Jackdaw",
    name.scientific = "Corvus monedula",
    massTotal = 0.215, #  (kg) total body mass
    wingSpan = 0.67, #  (m) maximum wing span
    wingArea = 0.0652, #  (m2) maximum wing area
    type = "passerine"
)

## simplest performance calculation
performance.myBird <- computeFlightPerformance(myBird)
performance.myBird
# Name: Jackdaw
# Sc. name: Corvus monedula
# Bird definitions: NA
#               speed power.aero power.chem strokeplane amplitude
# minimumSpeed  2.706      5.234      27.29        49.9      51.3
# minimumPower  8.031      2.093      12.27        28.1      34.5
# maximumRange 11.025      2.523      14.33        18.2      36.7
# maximumSpeed 16.590      5.235      27.29         6.8      50.2
# Maximum climb performance:
#                  speed power.aero power.chem strokeplane amplitude climbRate
# maximumClimbRate  8.89      5.234      27.29        24.5      53.9      1.18
# Minimized migration time:
#                  speed speed.migration power.aero power.chem power.dep strokeplane amplitude
# minimumTimeSpeed 11.75           1.962      2.741      15.37     3.081       16.49     38.04

## optimize strokeplane angle and use speed dependent frequency
funFrequency = function(U){19.8 - 4.7*U + 0.45*U^2 - 0.0138*U^3}
performance.myBird <- computeFlightPerformance(myBird,strokeplane='opt',frequency=funFrequency)
performance.myBird
# Name: Jackdaw
# Sc. name: Corvus monedula
# Bird definitions: NA
#               speed power.aero power.chem strokeplane amplitude
# minimumSpeed  2.293      5.229      27.27        49.9      43.8
# minimumPower  8.192      2.319      13.35        21.6      42.8
# maximumRange 11.463      2.775      15.53        14.9      44.3
# maximumSpeed 16.088      5.233      27.29         8.3      64.5
# Maximum climb performance:
#                  speed power.aero power.chem strokeplane amplitude climbRate
# maximumClimbRate  8.89      5.234      27.29        24.5      53.9      1.18
# Minimized migration time:
#                  speed speed.migration power.aero power.chem power.dep strokeplane amplitude
# minimumTimeSpeed 12.07           1.905      2.964      16.43     3.081       14.13     45.13

## plot variation of speed, power and flapping kinematics
plot(performance.myBird$powercurve[c('speed','power.aero','strokeplane','frequency','amplitude')])

## plot power factors
plot(performance.myBird$powercurve[c('speed','power.aero')])
plot(performance.myBird$powercurve[c('speed','kP.ind')])
plot(performance.myBird$powercurve[c('speed','kP.pro0')])
plot(performance.myBird$powercurve[c('speed','kP.pro2')])
 # end dontrun