How to create a velocity measure with a python script

Question

I have the following function. There is a part with several markers all containing 'f' in the marker name. I need to loop through the markers and create a velocity measure on each one~Vx in this case. I get an error saying that the object has no such measureable characteristic. I have tried to pass a few different arguments in the 'object' parameter to no avail. Any help in this matter would be greatly appreciated.

mod = Adams.getCurrentModel()

def velocityMeasures():

modelName = mod.full_name

part =Adams.stoo(f"{modelName}.myPart")

markerKeys= list (part.Markers.keys())

for key in markerKeys:

if 'f' in key:

obj = part.Markers["f{key}"]

mod.Measures.createObject(name=f"Vx{key}", object=obj, characteristic='translational_velocity', component='x_component')

Kent West · Accepted Answer

Hi Todd,

I think that you should iterate through the list of markers using the pattern that I show below as a starting point. Then you get the name AND the object in each iteration, which I find to be easier to work with.

Next, I had a problem using the Measures.createObject() function so I just resorted to creating the function expression directly and using Measures.createFunction() instead. Hope this helps..

-------- working example: ----------

# Find markers with name 'mar' under a part:

par = Adams.stoo('part_4')

for marName, marObject in par.Markers.items():

if 'MAR' in marName:

print('Found {} as object: {}'.format(marName, marObject))

measName = '{}_vx'.format(marName)

vx_func = 'VX({}, 0, 0)'.format(marName)

mod.Measures.createFunction(name=measName, function=vx_func)