Uncontrolable oscillation at lower speeds (< 10KMPH) in Front Wheels in Lateral Direction, Where as the oscillations disappear above 15KMPH

ilapakurti Venkata Naga over 5 years ago

My ADAMS Car Model sets up an uncontrollable oscillation at lower speeds (< 10KMPH)

The vehicle is Front Engine Front wheel driven type

Simulation: 10KMPH Mainitain on Plain road

The oscillation is observed in Front Wheels

The Oscillation is missing above 15KMPH

I have checked all the bushes for Self excitation warning. Nothing

Power train is connected properly to the drive shafts and drive shafts are properly attached to the spindle.

Solver Setting Used: GSTIFF/I3

SI2 setting is giving an acceptable result, but I am wondering if I am missing something in modelling. If anybody else has encountered any such problem, please guide.

Attached Files (1)

Parents

0 Jesper Slattengren over 2 years ago

I have had models that behaves well with P=D=0, but only for certain events. And it is very dependent on vehicle and event.

Here is my generic truck values:

      vxP="1000"

      vxI="500"

      vxD="0"

      LatPthP="0.1"

      LatPthI="0.1"

      LatPthD="0"

      LatAyP="0.1"

      LatAyI="10"

      LatAyD="0"

      LatAyCP="0.003"

      LatAyCI="0.001"

      LatAyCD="0"

      SteFrcP="10"

      SteFrcI="20"

      SteFrcD="3"

      SteTrqP="10"

      SteTrqI="20"

      SteTrqD="3"

(I think this is too aggressive on throttle control though)

And here is what I used for a specific off-road military truck (6x6) driving over a *very* uneven terrain:

      vxP="100"

      vxI="50"

      vxD="0"

      LatPthP="0.100000"

      LatPthI="0.120000"

      LatPthD="0.000000"

      LatAyP="1"

      LatAyI="10"

      LatAyD="0"

      LatAyCP="0.003"

      LatAyCI="0.001"

      LatAyCD="0"

      SteFrcP="10"

      SteFrcI="20"

      SteFrcD="3"

      SteTrqP="8.35000"

      SteTrqI="43.1400"

      SteTrqD="9.10000"
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel

Reply

0 Jesper Slattengren over 2 years ago

I have had models that behaves well with P=D=0, but only for certain events. And it is very dependent on vehicle and event.

Here is my generic truck values:

      vxP="1000"

      vxI="500"

      vxD="0"

      LatPthP="0.1"

      LatPthI="0.1"

      LatPthD="0"

      LatAyP="0.1"

      LatAyI="10"

      LatAyD="0"

      LatAyCP="0.003"

      LatAyCI="0.001"

      LatAyCD="0"

      SteFrcP="10"

      SteFrcI="20"

      SteFrcD="3"

      SteTrqP="10"

      SteTrqI="20"

      SteTrqD="3"

(I think this is too aggressive on throttle control though)

And here is what I used for a specific off-road military truck (6x6) driving over a *very* uneven terrain:

      vxP="100"

      vxI="50"

      vxD="0"

      LatPthP="0.100000"

      LatPthI="0.120000"

      LatPthD="0.000000"

      LatAyP="1"

      LatAyI="10"

      LatAyD="0"

      LatAyCP="0.003"

      LatAyCI="0.001"

      LatAyCD="0"

      SteFrcP="10"

      SteFrcI="20"

      SteFrcD="3"

      SteTrqP="8.35000"

      SteTrqI="43.1400"

      SteTrqD="9.10000"
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel

Children

No Data