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Co-simulation between Altair Twin-activate and Motionsolve

Hi,
I am working on hydraulics and Multibody simulation, where i have to co-relate the hydraulics with the motion of the machine. I successfully generated an FMU from the twin-activate. I will give a simple overview of what the aim is, Torque at the roller of the machine will be input to the activate model, the output from the activate will be speed of the roller.

From the tutorials, I learnt that, we create Solver variable for Input to the FMU, and relate FMU with solver varible using VARVAL fucntion and idstring.
Later, we give expression to the motion using ARYVAL AND Idstring of FMU output array. Doing this, i am getting an error that says " Failure in pursing fmu.idstring".

If i am wrong in the process, please correct the process and your thoughts on this.

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English

MotionView/MotionSolve

v2023.0

Accepted answers

Christopher_Fadanelli

Hi Christopher,

Unfortunately i am not supposed to share the model, I will attach the pictures will may be helpful.
There are 3 rollers, in which 2 are drums and the middle one is a vibration shaft. So, i created a solver string and gave expression as TM(Id.string of joint) for all three rollers. and using VARVAL in FMU to VARVAL(id.string of solver string). And this FMU output is called usig ARAYVAL in motion, just like you suggested using output array. In this process i am stuck with an error, which i have tagged below.

Hi Bhuvana,

No worries. For the VARVAL error. Can you try adding {} around the idstring? For example: `VARVAL({sv_left_height.idstring})`

If you run check model. . The Expression should show the id encompassed in VARVAL

If you haven't generated the id for the solver variable. It will look like this.

Let me know if I need to reclarify anything.

Best,

Christopher

All comments

Christopher_Fadanelli

Hello Bhuvana,

Thank you for reaching out. Some questions, was the fmu created in Twin Activate or another product?

Can you share model (File -> Export -> Model -> Archive Model)/pictures on how you set up the expression referring to the FMU?

Make sure the motion input its set to Expression and you incorporate the expression like so `ARYVAL({fmu_idstring.y_array.id},1)`.

Best,

Christopher Fadanelli

GTT Adam

Hi Bhuvana,

For a detailed example on the implementation of an FMU entity, please refer to tutorial MV-7012: Functional Mockup Unit (FMU) in MotionView and MotionSolve:

Link: https://help.altair.com/hwsolvers/ms/topics/tutorials/mv/tut_mv_7012_fmu_in_mv_ms_t.htm?zoom_highlight=fmu

The Tutorial Model files you may need for this example can be found here:

https://community.altair.com/community?id=altair_product_documentation&spa=1&filter=product%3D64069018db0348102af07608f4961975%5Eoutput_type%3Dmodel%5Eversion%3D2023.1&p=1&d=asc

It looks as though the tutorial has not been updated to reflect our new interface, however the steps will be nearly identical. Just remember that the 'Panels' has been replaced with the Entity Editor. If you hit any snags, just let me know and I can clarify any of the steps.

Hope this helps!

Adam Reid

Bhuvana Siva Teja

Hi Bhuvana,

For a detailed example on the implementation of an FMU entity, please refer to tutorial MV-7012: Functional Mockup Unit (FMU) in MotionView and MotionSolve:

Link: https://help.altair.com/hwsolvers/ms/topics/tutorials/mv/tut_mv_7012_fmu_in_mv_ms_t.htm?zoom_highlight=fmu

The Tutorial Model files you may need for this example can be found here:

https://community.altair.com/community?id=altair_product_documentation&spa=1&filter=product%3D64069018db0348102af07608f4961975%5Eoutput_type%3Dmodel%5Eversion%3D2023.1&p=1&d=asc

It looks as though the tutorial has not been updated to reflect our new interface, however the steps will be nearly identical. Just remember that the 'Panels' has been replaced with the Entity Editor. If you hit any snags, just let me know and I can clarify any of the steps.

Hope this helps!

Adam Reid

Hi,
Thank you for the information, I am stuck with this error.

Error.png

Bhuvana Siva Teja

Hello Bhuvana,

Thank you for reaching out. Some questions, was the fmu created in Twin Activate or another product?

Can you share model (File -> Export -> Model -> Archive Model)/pictures on how you set up the expression referring to the FMU?

Make sure the motion input its set to Expression and you incorporate the expression like so `ARYVAL({fmu_idstring.y_array.id},1)`.

Best,

Christopher Fadanelli

Hi Christopher,

Unfortunately i am not supposed to share the model, I will attach the pictures will may be helpful.
There are 3 rollers, in which 2 are drums and the middle one is a vibration shaft. So, i created a solver string and gave expression as TM(Id.string of joint) for all three rollers. and using VARVAL in FMU to VARVAL(id.string of solver string). And this FMU output is called usig ARAYVAL in motion, just like you suggested using output array. In this process i am stuck with an error, which i have tagged below.

Co-simulation.docx

Christopher_Fadanelli

Hi Christopher,

Unfortunately i am not supposed to share the model, I will attach the pictures will may be helpful.
There are 3 rollers, in which 2 are drums and the middle one is a vibration shaft. So, i created a solver string and gave expression as TM(Id.string of joint) for all three rollers. and using VARVAL in FMU to VARVAL(id.string of solver string). And this FMU output is called usig ARAYVAL in motion, just like you suggested using output array. In this process i am stuck with an error, which i have tagged below.

Hi Bhuvana,

No worries. For the VARVAL error. Can you try adding {} around the idstring? For example: `VARVAL({sv_left_height.idstring})`

If you run check model. . The Expression should show the id encompassed in VARVAL

If you haven't generated the id for the solver variable. It will look like this.

Let me know if I need to reclarify anything.

Best,

Christopher