Get Harmonic results with DPF

Mike.Thompson
Mike.Thompson Member, Employee Posts: 342
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in Structures

Get the harmonic results with DPF and compare them to the Mechanical results. Uses an operator to combine the real+img components together to get the amplitude results (same as mechanical results)

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  • Mike.Thompson
    Mike.Thompson Member, Employee Posts: 342
    25 Answers 100 Comments 25 Likes First Anniversary
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    edited February 28

    FYI the code snippet from the model attached in original post is below:

    #-----------------------------------------------------------------------------------------
#Keep this suppressed.
#Use this code in the scripting console
#-----------------------------------------------------------------------------------------
#Snippet will extract the results of the harmonic analysis with complex (real and img) results.
#It will convert it to an amplitude, and compare this against post processing objects in mechanical.

#This general process is based on a single node and single freq. for purposes of comparison to Mech. results.
#The mesh scoping and time/freq. scoping of the operators can be changed to make it more general across the mesh and freq. domains.
#-----------------------------------------------------------------------------------------
#User Inputs:
FreqSet = 5                 #Frequency Set you want to get results for
NsName = "Measure Node"     #Named Selection exact text name
#-----------------------------------------------------------------------------------------

#General Import Stuff
import mech_dpf
import Ans.DataProcessing as dpf
mech_dpf.setExtAPI(ExtAPI)
analysis=Model.Analyses[0]
dataSource = dpf.DataSources(analysis.ResultFileName)

#Get the node Id you want to measure
MeasureNdId = ExtAPI.DataModel.GetObjectsByName(NsName)[0].Ids[0]
MeshScoping = dpf.MeshScopingFactory.NodalScoping([MeasureNdId])
print "Named Selection = '%s' with Node Id = %s" % (NsName, MeasureNdId)

#Get the time freq. support for the results file (set, step, substep, freq. info)
TFSOp = dpf.operators.metadata.time_freq_provider()
TFSOp.inputs.data_sources.Connect(dataSource)
TFS = TFSOp.outputs.time_freq_support.GetData()
#Make a frequency scoping to know what freq. to export
FreqScoping = dpf.TimeFreqScopingFactory.ScopingByStepAndSubstep(1,FreqSet,TFS)
print "Frequency for results: %s [Hz]" % TFS.GetTimeFreq(FreqSet-1)  #subtract 1 for a zero-based index

#Get the displacement via dpf operator
u = dpf.operators.result.displacement()
u.inputs.data_sources.Connect(dataSource)
u.inputs.mesh_scoping.Connect(MeshScoping)
u.inputs.time_scoping.Connect(FreqScoping)
uFC = u.outputs.fields_container.GetData()

#Convert the complex result (real and img.) to an amplitude result
#This will be consistant with mechanical
AmpOp = dpf.operators.math.amplitude_fc() # operator instantiation
AmpOp.inputs.fields_container.Connect(uFC)
AmpFC = AmpOp.outputs.fields_container.GetData()
#print AmpFC
print "DPF Results for Node: %s [X,Y,Z] with units=%s" % (MeasureNdId, AmpFC[0].Unit)
#print AmpFC[0].Data
DpfValues = [Quantity(V, AmpFC[0].Unit) for V in AmpFC[0].Data]
print DpfValues

CheckObjIds = [51,54,62]
CheckObjs = [ExtAPI.DataModel.GetObjectById(Id) for Id in CheckObjIds]
for Obj in CheckObjs:
    Obj.SetNumber=FreqSet
Obj.Parent.EvaluateAllResults()
for Obj in CheckObjs:
    Obj.RenameBasedOnDefinition()

MechValues = [abs(Obj.Maximum) for Obj in CheckObjs]
Diffs = [((MechValues[i] - DpfValues[i]) / MechValues[i]) * 100. for i in range(3)]
print "% Difference in the dpf values to Mechanical object values"
print Diffs

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