Static Simulation of a Vehicle for Weight Distribution Determination

[struclearner]

What is the best way to determine the weight distribution on each wheel for a full vehicle model, in ADAMS View. I am not able to complete the static simulation, getting some error. The end time and number of steps specified for static simulation, should be what and what is the meaning of these in static simulation. Is there any other way to figure out the weight distribution on tires at static conditions in ADAMS view, with out referring to static equilibrium calculations.
Thanks for the reply and help.

 

[GregLocock]

No, there isn't any other way. If you can't get your model into static equilibrium then it'll struggle dynamically. The meaning of the settings is discussed in the help. Try using a static funnel, which in command language looks like

!  Static Funnel
equil/maxit= 4000, err=10000, imb=10000, stab=10000
CONTROL/FUNC=USER(1010,555)
equil/maxit= 4000, err=1000, imb=1000, stab=100
CONTROL/FUNC=USER(1010,555)
equil/maxit= 4000, err=100, imb=100, stab=10
CONTROL/FUNC=USER(1010,555)
equil/maxit= 4000, err=0.1, imb=0.1, stab=0.1
CONTROL/FUNC=USER(1010,555)
equil/maxit= 4000, err=1, imb=0.1, stab=0.03
CONTROL/FUNC=USER(1010,555)

As you can see reduces the error imbalance and stability progressively. This assembles the model roughly and then jostles everything into compatibility, under the influence of gravity.

I don't know if static funnel is routinely available in View, but the above does at least give you some values to try.

Have you ever had this model running? if so export the running version as an adm file, which is written in Solver language, and compare it with the current version, using gdiff or winmerge or beyond compare. Also the error messages do actually tell you what is going on, but they are not very helpful as they are another level of pseudocode under the Solver language.



Cheers

Greg Locock


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

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

 

[GregLocock]

You need to use the static equilibrium tool.

Static Equilibrium Tool

Interactive Simulation dialog box → Static Equilibrium Tool

Performs a static simulation on your model. Adams/Solver iteratively repositions all the parts in an attempt to balance all the forces for one particular point in time. Each static simulation is independent of the time-varying effects of velocity and acceleration. Therefore, no inertial forces are taken into account. A positioning of your parts for which all your forces balance is known as an equilibrium configuration.

Cheers

Greg Locock


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

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