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Minoru Yubuchi

Brake Modelica Block in Activate

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Dear all,

 

1) In the Activate on-line help, ports of Brake Modelica block are described as:

--------------------

f_normalized.
Support/housing of component
support.
Optional port to which dissipated losses are transported in form of heat
heatPort.
Normalized force signal 0..1 (normal force = fn_max*f_normalized; brake is active if > 0)
--------------------

Is thi correct? It should be:

 --------------------

f_normalized.
Normalized force signal 0..1 (normal force = fn_max*f_normalized; brake is active if > 0)
support.
Support/housing of component
heatPort.
Optional port to which dissipated losses are transported in form of heat
--------------------

Correct?

 

2) I turned on the support port and attached a spring/damper block to it, but the model issued an error. Please let me know how to use the port.

 

I attached the model. Please let me know how to modify it.

 

Regards,

Minoru Yubuchi

 

Brake03.scm

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Yubuchi-san,

ad 1) I think you are right. Somehow the explanatory texts have shifted. The Modelica source code contains e. g.

Modelica.Blocks.Interfaces.RealInput f_normalized "Normalized force signal 0..1 (normal force = fn_max*f_normalized; brake is active if > 0)"

ad 2) Your model should work, but OpenModelica also has its numerical difficulties with it. If you add a mass at support port, the model works fine (see Brake04.scm).

 

Best regards,
Ronald

Brake04.scm

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