6DOF - Custom variable mass - No Abb and dwb/dt anymore in 2025a

Hello,

I would like to know how we can get the Accel and angular accel out of the Custom Variable Mass 6DOF (Euler angles) block in the new 2025a version.

First of all why did they do that and added the new 6dof accell blocks ?

And does someone have an updated doc to use that with the new block ?

Also the setting needed to be able to calculate the accel with the other block when using custom variable mass doesn't exist ? and exist for simple variable mass, is there a way to revert that change and use old block in new version like 2025b ?

Answer 1

[Spoorthy Kannur]

Hi Noé,

Starting in MATLAB R2025a, the acceleration output ports were removed from all 6DOF blocks, including the Custom Variable Mass 6DOF (Euler Angles) block. The previous “Include inertial acceleration” option has been replaced by “Output mass properties for acceleration computation.” You can now use these outputs (mass, inertia, etc.) to manually compute acceleration. This change improves model generality for varying mass/inertia cases. Unfortunately, older block behaviour cannot be restored directly in R2025a or newer.

You may find the following documentation pages useful:

• https://www.mathworks.com/help/aeroblks/customvariablemass6dofeulerangles.html
• https://www.mathworks.com/help/aeroblks/simplevariablemass6dofeulerangles.html
• https://www.mathworks.com/help/aeroblks/6dofeulerangles.html

​​If this does resolve the issue, kindly reach out to MathWorks Technical Support for more help (https://www.mathworks.com/support/contact_us.html)

[Paul]

Also,

https://www.mathworks.com/help/releases/R2025a/aeroblks/6dofacceleration.html

https://www.mathworks.com/help/releases/R2025a/aeroblks/6dofangularacceleration.html

In what way did this change improve model generality?