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Force Limiter

1-D Translational Force Limiter

 

Description

Equations

Variables

Connections

Parameters

Description

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.

Equations

srel=sbsa

vrel=dsreldt={sf2+v2minlimitedsf1+v1maxlimitedv1.sf2v2.sf1f1f2otherwise

f=fa=fb=mdvreldt+dvrel+{f2+sf2'df/dv'minlimitedf1+sf1'df/dv'maxlimitedsotherwise

maxlimited&equals;s<f1

minlimited&equals;f2<s

Variables

Name

Units

Description

Modelica ID

srel

m

Relative distance between flanges

s_rel

f

N

Force between flanges

f

vrel

ms

Relative velocity of flanges

v_rel

Connections

Name

Description

Modelica ID

flangea

Left flange

flange_a

flangeb

Right flange

flange_b

fmax

Optional real input signal that sets maximum force (N)

fmax

fmin

Optional real input signal that sets minimum force (N)

fmin

Parameters

Name

Default

Units

Description

Modelica ID

Use fmax input

false

 

True (checked) means use an input signal to set maximum force

useFmaxInput

Use fmin input

false

 

True (checked) means use an input signal to set minimum force

useFminInput

fmax

+1

N

Maximum force

f_max

fmin

−1

N

Minimum force

f_min

m

0

kg

Relative translational inertia

m

d

0

Nsm

Relative translational damping constant

d

df/dv

0

Nsm

Slope of f vs vrel curve when force limited

df/dv

dv/df

0

mNs

Inverse slope of vrel vs f curve when not force limited

dv/df

See Also

1-D Mechanical Overview

Translational Friction and Stops