rolland.components.DiscrPad

class rolland.components.DiscrPad(*, sp=[0.0, 0.0], wdthp=0.0, etap=0, fresp=[0.0, 0.0], dp=[0.0, 0.0])

Bases: object

Discrete Pad Class.

Contains the properties of a discrete pad.

Parameters:

• sp (list[float])

• wdthp (float)

• etap (float)

• fresp (list[float])

• dp (list[float])

sp

Vertical/lateral pad stiffness (total value) \([N/m]\). Lateral value can be set to zero when lateral rail deflections are omitted.

Type:

list[float], default=[0.0, 0.0]

wdthp

Pad width in x-direction \([m]\).

Type:

float

etap

Pad loss factor \([-]\).

Type:

float

fresp

Vertical/lateral pad resonance frequencies [Hz]. This frequency is needed for calculating the viscous damping coefficient if it is not provided. Lateral value can be set to zero when lateral rail deflections are omitted.

Type:

list[float], default=[0.0, 0.0]

dp

Vertical/lateral pad damping coefficient (viscous) \([Ns/m]\). Lateral value can be set to zero when lateral rail deflections are omitted.

Type:

list[float], default=[0.0, 0.0]