Adams/Car - Static Load error

[orbay]

Hello,

For a long time, I am triying to apply vertical force to front suspension from tire contact patch and read the forces and torques on control arm bushings and joints. This is my aim.

I am setting up the hardpoints and required parameters of front suspension, and have been trying to perform static load analysis.
Since my vehicle is bus, forces are high (each tire 120.000 N). However every single time, it fails. I face such warnings: 'Actuator reached upper displacement limit' or 'Actuator reached lower displacement limit' or 'step size too small' (even the number of step size 10000). When I decrease the loads (ie 15.000 N), I don't face a problem.
From some training guides, I learnt that can modify the force limits using the Adams/Car Template Builder through the menus Build -> Actuator -> Joint Force -> Modify. I also do this but it fails again...
Please let me know if you have an experience about this.

Is that possible to also explain to me the difference between 'wheel vertical force' and 'actuator vertical force' for static load parameters?

Please let m e know your comments,

 

[GregLocock]

If you've got a model that works at 15kN, try 20 kN etc etc. Examine the successful run with the highest load, and see what is almost hitting some limit. This is actually explained in any basic introduction to ADAMS, start with something that works and make changes until it breaks.

Running an ADAMS model of a vehicle is very much like putting that vehicle on a test rig, if you don't have any experience of that then debugging ADAMS is doubly difficult.

Step size too small does not mean that you have set the step size too small, it means that the variable step size the solver uses has got too small. Read the documentation, or get the notes from the the Advanced Solver course, or ask MSc support.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?

 

[orbay]

Thank you for response.