TrainCarCoupler Icon

`TrainCarCoupler`

This component extends from TranslationalComponents.SpringDamper

Parameters:

Name	Description	Units	Default value
`c`	Spring constant defining the stiffness of the spring element	N/m
`d`	Damping constant defining the viscous friction of the damper element	N.s/m
`s_rel0`	Unstretched spring length	m	0

Connectors

flange_a - This connector represents a mechanical flange with position and force as the potential and flow variables, respectively. (Flange)
flange_b - This connector represents a mechanical flange with position and force as the potential and flow variables, respectively. (Flange)

Variables

Name	Description	Units
`s_rel`	Relative displacement between flangeb and flangea (flangeb.s - flangea.s).	m
`v_rel`	Relative velocity between flangeb and flangea, defined as der(s_rel).	m/s
`f`	Internal force exerted by the compliant element between the flanges.	N
`lossPower`	Power dissipated by the damper element due to viscous friction	W
`f_c`	Force exerted by the spring element	N
`f_d`	Force exerted by the damper element	N

\[ \begin{align} \mathtt{s\_rel}\left( t \right) &= \mathtt{flange\_b.s}\left( t \right) - \mathtt{flange\_a.s}\left( t \right) \\ \mathtt{v\_rel}\left( t \right) &= \frac{\mathrm{d} \mathtt{s\_rel}\left( t \right)}{\mathrm{d}t} \\ \mathtt{flange\_b.f}\left( t \right) &= f\left( t \right) \\ \mathtt{flange\_a.f}\left( t \right) &= - f\left( t \right) \\ \mathtt{f\_c}\left( t \right) &= c \left( - \mathtt{s\_rel0} + \mathtt{s\_rel}\left( t \right) \right) \\ \mathtt{f\_d}\left( t \right) &= d \mathtt{v\_rel}\left( t \right) \\ f\left( t \right) &= \mathtt{f\_c}\left( t \right) + \mathtt{f\_d}\left( t \right) \\ \mathtt{lossPower}\left( t \right) &= \mathtt{v\_rel}\left( t \right) \mathtt{f\_d}\left( t \right) \end{align} \]

Source

component TrainCarCoupler
  extends TranslationalComponents.SpringDamper(s_rel0 = 0)
metadata {
  "Dyad": {"icons": {"default": "dyad://DyadExampleComponents/spring_damper.svg"}}
}
end

Flattened Source

component TrainCarCoupler
  # Port for the first mechanical translational flange.
  flange_a = Flange() [{"Dyad": {"placement": {"icon": {"x1": -50, "y1": 450, "x2": 50, "y2": 550}}}}]
  # Port for the second mechanical translational flange.
  flange_b = Flange() [{"Dyad": {"placement": {"icon": {"x1": 950, "y1": 450, "x2": 1050, "y2": 550}}}}]
  # Relative displacement between flange_b and flange_a (flange_b.s - flange_a.s).
  variable s_rel::Distance
  # Relative velocity between flange_b and flange_a, defined as der(s_rel).
  variable v_rel::Velocity
  # Internal force exerted by the compliant element between the flanges.
  variable f::Dyad.Force
  # Spring constant defining the stiffness of the spring element
  parameter c::TranslationalSpringConstant
  # Damping constant defining the viscous friction of the damper element
  parameter d::TranslationalDampingConstant
  # Unstretched spring length
  parameter s_rel0::Length
  # Power dissipated by the damper element due to viscous friction
  variable lossPower::Power
  # Force exerted by the spring element
  variable f_c::Dyad.Force
  # Force exerted by the damper element
  variable f_d::Dyad.Force
relations
  s_rel = flange_b.s - flange_a.s
  v_rel = der(s_rel)
  flange_b.f = f
  flange_a.f = -f
  f_c = c * (s_rel - s_rel0)
  f_d = d * v_rel
  f = f_c + f_d
  lossPower = f_d * v_rel
metadata {
  "Dyad": {"icons": {"default": "dyad://DyadExampleComponents/spring_damper.svg"}}
}
end

Test Cases

No test cases defined.

Examples
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