ResponseExpression

Class Name

ResponseExpression

Attribute Summary

Name	Property	Designable
label	Str ()
function	Str ()	Yes
symbols	List ()
variables	List ()
scale	Double (1)

Usage

ResponseExpression (function=expressionString, symbols=[…], variables=[…])

Attributes

Defined as the an algebraic expression involving Dvs and Rvs.

function: String; An algebraic expression involving Dvs and Rvs.; The function attribute is mandatory.
symbols: List; Symbols that are used in the expression given.; The symbols attribute is mandatory.
variables: List; Solver entities (Dv/Responses) that symbols represent.; The variables attribute is mandatory.
scale: Double; Specifies the scale factor to scale the ResponseExpression value. If not specified, it defaults to 1.0.; This attribute is optional.

Optional attribute.

label: String; Specifies the name of the ResponseExpression object.; This attribute is optional. When not specified, MotionSolve creates a label for you.
scale: Double; Specifies the scale factor to scale the ResponseExpression value. If not specified, it defaults to 1.0.; This attribute is optional.

Examples

# 1: ResponseExpression as an explicit function of DVs

# kp, kd, ki are three Dvs
kp = Dv(label = 'Proportionality coefficient', b = 0.5, blimit = [0,1])
ki = Dv(label = 'Integral coefficient',        b = 0.5, blimit = [0,1])
kd = Dv(label = 'Derivative coefficient',      b = 0.5, blimit = [0,1])

# The ResponseExpression  is a function of these 3 Dvs 
self.R4 = ResponseExpression (
    label     = 'sum of squares',
function  = '1 - x**2 - y**2 - z**2',
symbols   = ['x', 'y', 'z'],
variables = [kp, kd, ki]
  )

#2: Slope of steer angle vs. Ride height curve at T=5.0

# Ride Height @ T=4.9
rideH49 =  ValueAtTime (
   label         = "RideHeight@49",
   measuredValue = "DZ(30701024,30701025,10701021)",
   atTime        = 4.90,
   delta         = 0.1,
  )

# Ride Height @ T=5.1
rideH51 =  ValueAtTime (
   label         = "RideHeight@51",
   measuredValue = "DZ(30701024,30701025,10701021)",
   atTime        = 5.10,
   delta         = 0.1,
  )

# Steer @ T=4.9
steer49 = ValueAtTime (
   label         = "Steer@49",
   measuredValue = "1000*YAW(30701025,30701024)*RTOD",
   atTime        = 4.90,
   delta         = 0.1,
  )

# Steer @ T=5.1
steer51 = ValueAtTime (
   label         = "Steer@51",
   measuredValue = "1000*YAW(30701025,30701024)*RTOD",
   atTime        = 5.10,
   delta         = 0.1,
  )

# Ride steer at T=5.0
rideSteer50 = ResponseExpression (
   label     = 'Slope of steer angle vs. Ride height curve at T=5.0',
   function  = '(y2-y1)/(x2-x1)',
   symbols   = ['y2', 'y1', 'x2', 'x1'],
   variables = [steer51, steer49, rideH51, rideH49]
  )