How to resolve this error in simscape multibody : "Model not assembled: position violation".

Hello team,

I am using Matlab R2021A.

I will share photos below for the working and not working model that i created in smnew :

When i am working with half symetrical model my model is running, but if i create full system model and both needs to be synced togethor it's throwing the error - "Model not assembled: position violation" .

Half Model:

This model is working with output as shown in below images (angular travel of 100 degrees).

Initial Position: Final Position:

This is half of the total assembly, if i create full and dont link these two systems than also it runs but with different speed and travel in degrees even though i am passing same inputs to both side. But if i connect these two with a rigid geometry than the error arises.

I comment out solid block connecting two subsystems to make connection between two symetrical systems.

Not connected (Not synced) ( Working) Connected ( Not working throwing error)

Although i am very confident with frame definations thay are very correct.

Kindly help me in solving this error as this is very important for me and needs to be done in very short time frame. i will be very thankfull to team if they help me crack this.

[J Chen]

It's not a good idea to rigidly connect the two assemblies. Some flexibility is needed in the "loop".

Answer 1

[Himanshu]

Hey,

I understand that you are trying to resolve the error : "Model not assembled: position violation" which you are encountering while trying to run a model in Simscape Multibody.

This error pertains to the violation of degrees-of-freedom constraints within the Base and Follower coordinate frames of a Joint in a mechanical system.

For instance, consider a Prismatic Joint oriented along the z-axis. Should the Base and Follower frames exhibit offsets along the x or y directions that surpass the system's capacity to compensate, this error will manifest.

To address this issue, it is recommended to employ a Transform Sensor block to pinpoint the precise misalignment within the frames. Subsequently, adjustments can be made utilizing a Rigid Transform block to rectify the misplacement effectively.

I hope this helps you resolve this error.