Force Limiter
1-D Translational Force Limiter
Description
Equations
Variables
Connections
Parameters
The Force Limiter component limits the positive and negative force transmitted between two translational flanges.
The force limits can either be set by parameters or controlled via input signals.
The parameters 'df/dv' and 'dv/df' set the slope and inverse slope of the force vs relative velocity curve in the limiting and non-limiting regions, respectively.
The parameters d and m add damping and mass to the relative motion between the two flanges.
srel=sb−sa
vrel=dsreldt={s−f2+v2minlimiteds−f1+v1maxlimitedv1.⁡s−f2−v2.⁡s−f1f1−f2otherwise
f=−fa=fb=m⋅dvreldt+d⋅vrel+{f2+s−f2⋅'df/dv'minlimitedf1+s−f1⋅'df/dv'maxlimitedsotherwise
maxlimited=s<f1
minlimited=f2<s
Name
Units
Modelica ID
srel
m
Relative distance between flanges
s_rel
f
N
Force between flanges
vrel
ms
Relative velocity of flanges
v_rel
flangea
Left flange
flange_a
flangeb
Right flange
flange_b
fmax
Optional real input signal that sets maximum force (N)
fmin
Optional real input signal that sets minimum force (N)
Default
Use fmax input
false
True (checked) means use an input signal to set maximum force
useFmaxInput
Use fmin input
True (checked) means use an input signal to set minimum force
useFminInput
+1
Maximum force
f_max
−1
Minimum force
f_min
0
kg
Relative translational inertia
d
N⋅sm
Relative translational damping constant
df/dv
Slope of f vs vrel curve when force limited
dv/df
mN⋅s
Inverse slope of vrel vs f curve when not force limited
See Also
1-D Mechanical Overview
Translational Friction and Stops
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