How to merge front and rear half car model for full vehicle simulation?

Sudip_Chavan

Hello Everyone,

I have built custom front and rear half car MBD model. I am able to run all kinematic and compliance analysis test on both models individually. For the furthur development I am looking for full vehicle events with driver. 

 

Can anyone help me out with the process of merging both models together with driver? 

 

Thanks and Regards,

Sudip Chavan

Christopher_Fadanelli

Hello Sudip,

What you will need to do is export each required system in both half car models. In a new session, use the assembly wizard to create a full vehicle model. Once that is done, you will need to delete the systems you are going to replace. Then import those systems from your half car models. For adding full vehicle events, it will be the same process as adding an event for half car model. The task wizard.

To observe a demo on how to export/import systems for your vehicle model, please refer to our free eLearning: https://learn.altair.com/course/view.php?id=497  

For more information on the type of events with Altair Driver, please refer to this link: https://2021.help.altair.com/2021.2/hwdesktop/mv/topics/chapter_heads/full_vehicles_with_driver_r.htm

 

Best,

Christopher Fadanelli

Application Engineer - Multibody Dynamics

Troy, MI

GTT Adam

Hi Sudip,

The assembly of these models can be simply completed by exporting one of the Systems as a System Definition. In your rear car model, simply go to File >> Export >> Model >> MDL Definition. Then, in your front car model, go to File >> Import >> MDL Definition. You will then have to manually connect the models using joints/etc. from that point. 

 

Hope this helps!

Adam Reid

Christopher_Fadanelli

Hello Sudip,

What you will need to do is export each required system in both half car models. In a new session, use the assembly wizard to create a full vehicle model. Once that is done, you will need to delete the systems you are going to replace. Then import those systems from your half car models. For adding full vehicle events, it will be the same process as adding an event for half car model. The task wizard.

To observe a demo on how to export/import systems for your vehicle model, please refer to our free eLearning: https://learn.altair.com/course/view.php?id=497  

For more information on the type of events with Altair Driver, please refer to this link: https://2021.help.altair.com/2021.2/hwdesktop/mv/topics/chapter_heads/full_vehicles_with_driver_r.htm

 

Best,

Christopher Fadanelli

Application Engineer - Multibody Dynamics

Troy, MI

Sudip_Chavan

Adam Reid_21142 said:

Hi Sudip,

The assembly of these models can be simply completed by exporting one of the Systems as a System Definition. In your rear car model, simply go to File >> Export >> Model >> MDL Definition. Then, in your front car model, go to File >> Import >> MDL Definition. You will then have to manually connect the models using joints/etc. from that point. 

 

Hope this helps!

Adam Reid

Thanks Adam! It is helpful.

 

Sudip_Chavan

Christopher Fadanelli_22565 said:

Hello Sudip,

What you will need to do is export each required system in both half car models. In a new session, use the assembly wizard to create a full vehicle model. Once that is done, you will need to delete the systems you are going to replace. Then import those systems from your half car models. For adding full vehicle events, it will be the same process as adding an event for half car model. The task wizard.

To observe a demo on how to export/import systems for your vehicle model, please refer to our free eLearning: https://learn.altair.com/course/view.php?id=497  

For more information on the type of events with Altair Driver, please refer to this link: https://2021.help.altair.com/2021.2/hwdesktop/mv/topics/chapter_heads/full_vehicles_with_driver_r.htm

 

Best,

Christopher Fadanelli

Application Engineer - Multibody Dynamics

Troy, MI

Thanks Christopher! It is helpful. 

Sudip_Chavan

Greetings!

I have merged front & rear half car model successfully and added Altair Driver & Altair Driver file to run full vehicle events. I'm currently facing following errors during model check.

1. Unknown symbol sys_tires.m_road_ref_frnt.l...Error resolving entity Path reference marker under Model-Altair Driver. [General]

2.Unknown symbol "att_path_reference.id" in expression:...att_path_reference.id...Templex error evaluating text under Model-AltairDriverFile 0-Altair Driver. [General]

When I deactivate Driver and driver file then model check doesn't pop up any error as above.

There's no any option to edit markers in driver/ driver file. How to change it? 

 

Best Regards,

Sudip Chavan

Praful

Hello Sudip / Chris

I guess you should not need to delete each system and re-import them in the full vehicle model. Assuming the front and rear half car models are built from the library and the same library, you could follow the following steps

1. From each model (front and rear), export model, data only. (File > Export > Model) to mdls

2. Build the full vehicle model with the same set of front and rear systems using the same library.

3. Import the exported models (File > Import > Model)

you should have the full vehicle system configuration matching with the half cars.

 

Regards

Praful

 

Sudip_Chavan

Praful Prabhu_20784 said:

Hello Sudip / Chris

I guess you should not need to delete each system and re-import them in the full vehicle model. Assuming the front and rear half car models are built from the library and the same library, you could follow the following steps

1. From each model (front and rear), export model, data only. (File > Export > Model) to mdls

2. Build the full vehicle model with the same set of front and rear systems using the same library.

3. Import the exported models (File > Import > Model)

you should have the full vehicle system configuration matching with the half cars.

 

Regards

Praful

 

Hello Praful,

I've customized my front and rear suspension systems with a unique combination of bodies, joints, markers, and forces after initially creating them from template models. Rebuilding them from scratch in a full vehicle scenario would require additional effort. Instead, I exported my customized models using MDL statements and then imported them into the full vehicle template model. This process seems to have merged them properly, as there were no warnings or errors during the model check.

After adding Altair Driver and AltairDriverFile, I encountered the following errors:

1. Unknown symbol sys_tires.m_road_ref_frnt.l...Error resolving entity Path reference marker under Model-Altair Driver. [General]

2.Unknown symbol "att_path_reference.id" in expression:...att_path_reference.id...Templex error evaluating text under Model-AltairDriverFile 0-Altair Driver. [General]

I noticed that there's no option to edit markers in the driver or driver file. Could you please advise on how to change them?

Best Regards,

Sudip Chavan

Christopher_Fadanelli

Sudip Chavan_20509 said:

Greetings!

I have merged front & rear half car model successfully and added Altair Driver & Altair Driver file to run full vehicle events. I'm currently facing following errors during model check.

1. Unknown symbol sys_tires.m_road_ref_frnt.l...Error resolving entity Path reference marker under Model-Altair Driver. [General]

2.Unknown symbol "att_path_reference.id" in expression:...att_path_reference.id...Templex error evaluating text under Model-AltairDriverFile 0-Altair Driver. [General]

When I deactivate Driver and driver file then model check doesn't pop up any error as above.

There's no any option to edit markers in driver/ driver file. How to change it? 

 

Best Regards,

Sudip Chavan

Hi Sudip,

 

Can you confirm that the Altair Driver Attachments are set up properly? In 2021.2, go to Altair Driver -> In panel area -> choose attachments.

 

There you can check the Path reference, "att_path_reference.id"

 

Can you also double check the attachments for the auto tires. " Unknown symbol sys_tires.m_road_ref_frnt.l" This is referring to the AutoTires system -> "Road reference Marker Front -Left".

 

Best,

 

Christopher Fadanelli