accelerationsensor-relative

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accelerationsensor-relative

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Iconic Diagrams\Mechanical\Translation\Sensors

Use

Domains: Continuous. Size: 1-D. Kind: Iconic Diagrams (Translation), Block Diagrams.

Description

This model describes an acceleration sensor which derives an acceleration output out of a velocity difference (between high and low terminals) by differentiation. Differentiation is performed by a state variable filter:

DifferentiateSVF

The S-domain function of this filter is equal to:

DifferentiateSVFequation

where f is the cut-off frequency. For very high values of f, the output becomes the pure derivative of the input. High values of f, however, increase simulations times. A good trade-off is a starting value of 1e5.

 

The equations of this model are:

 

a = d( p_high.v - p_low.v)/dt;

p_low.F = p_high.F = indifferent;

 

Interface

Ports

Description

p_high, p_low

Both terminals of the Translational port p.

Causality

 

fixed force out

 

Output

 

a

Acceleration (measured as the difference between both terminals) [m/s2]

Parameters

 

f

a_initial

Cut-off frequency of the differentiation [Hz].

Initial acceleration [m/s].