基于Python的结构优化? 50
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abaqus二次开发,源程序由我提供,但是需要进行改变,将单材料的优化程序改为多材料的优化程序,基于Python语言,源代码写的很清楚,改动不会太大,但是会附带后处理的问题解决,详情细聊。
import math,customKernel from abaqus import getInput,getInputs from odbAccess import openOdb ## Function of formatting Abaqus model for stiffness optimisation def fmtMdb(Mdb): mdl = Mdb.models['Model-1'] part = mdl.parts['Part-1'] # Build sections and assign solid section mdl.Material('Material01').Elastic(((1.0, 0.3), )) mdl.HomogeneousSolidSection('sldSec','Material01') mdl.Material('Material02').Elastic(((0.001**3, 0.3), )) mdl.HomogeneousSolidSection('voidSec','Material02') part.SectionAssignment(part.Set('ss',part.elements),'sldSec') # Define output request mdl.FieldOutputRequest('SEDensity','Step-1',variables=('ELEDEN', )) mdl.HistoryOutputRequest('ExtWork','Step-1',variables=('ALLWK', )) ## Function of running FEA for raw sensitivities and objective function def FEA(Iter,Mdb,Xe,Ae): Mdb.Job('Design_Job'+str(Iter),'Model-1').submit() Mdb.jobs['Design_Job'+str(Iter)].waitForCompletion() opdb = openOdb('Design_Job'+str(Iter)+'.odb') seng = opdb.steps['Step-1'].frames[-1].fieldOutputs['ESEDEN'].values for en in seng: Ae[en.elementLabel]=en.data/Xe[en.elementLabel] obj=opdb.steps['Step-1'].historyRegions['Assembly ASSEMBLY'].historyOutputs['ALLWK'].data[-1][1] opdb.close() return obj ## Function of preparing filter map (Fm={elm1:[[el1,el2,...],[wf1,wf2,...]],...}) def preFlt(Rmin,Elmts,Nds,Fm): # Calculate element centre coordinates c0 = {} for el in Elmts: nds = el.connectivity c0[el.label]=[sum([Nds[nd].coordinates[i]/len(nds) for nd in nds]) for i in range(3)] # Weighting factors for el in Elmts: Fm[el.label] = [[],[]] for em in Elmts: dis=math.sqrt(sum([(c0[el.label][i]-c0[em.label][i])**2 for i in range(3)])) if dis<Rmin: Fm[el.label][0].append(em.label) Fm[el.label][1].append(Rmin - dis) sm = sum(Fm[el.label][1]) for i in range(len(Fm[el.label][0])): Fm[el.label][1][i] /= sm ## Function of filtering sensitivities def fltAe(Ae,Fm): raw = Ae.copy() for el in Fm.keys(): Ae[el] = 0.0 for i in range(len(Fm[el][0])): Ae[el]+=raw[Fm[el][0][i]]*Fm[el][1][i] ## Function of optimality update for design variables and Abaqus model def BESO(Vf,Xe,Ae,Part,Elmts): lo, hi = min(Ae.values()), max(Ae.values()) tv = Vf*len(Elmts) while (hi-lo)/hi > 1.0e-5: th = (lo+hi)/2.0 for key in Xe.keys(): Xe[key] = 1.0 if Ae[key]>th else 0.001 if sum(Xe.values())-tv>0: lo = th else: hi = th # Label elements as solid or void vlb, slb = [], [] for el in Elmts: if Xe[el.label] == 1.0: slb.append(el.label) else: vlb.append(el.label) # Assign solid and void elements to each section Part.SectionAssignment(Part.SetFromElementLabels('ss',slb),'sldSec') Part.SectionAssignment(Part.SetFromElementLabels('vs',vlb),'voidSec') ## ====== MAIN PROGRAM ====== if __name__ == '__main__': # Set parameters and inputs pars = (('VolFrac:','0.5'), ('Rmin:', '1'), ('ER:', '0.02')) vf,rmin,ert = [float(k) if k!=None else 0 for k in getInputs(pars,dialogTitle='Parameters')] if vf<=0 or rmin<0 or ert<=0: sys.exit() mddb = openMdb(getInput('Input CAE file:',default='Test.cae')) # Design initialization fmtMdb(mddb) part = mddb.models['Model-1'].parts['Part-1'] elmts, nds = part.elements, part.nodes oh, vh = [], [] xe, ae, oae, fm = {}, {}, {}, {} for el in elmts: xe[el.label] = 1.0 if rmin>0: preFlt(rmin,elmts,nds,fm) # Optimisation iteration change, iter, obj = 1, -1, 0 while change > 0.001: iter += 1 # Run FEA oh.append(FEA(iter,mddb,xe,ae)) # Process sensitivities if rmin>0: fltAe(ae,fm) if iter > 0: ae=dict([(k,(ae[k]+oae[k])/2.0) for k in ae.keys()]) oae = ae.copy() # BESO optimisation vh.append(sum(xe.values())/len(xe)) nv = max(vf,vh[-1]*(1.0-ert)) BESO(nv,xe,ae,part,elmts) if iter>10: change=math.fabs((sum(oh[iter-4:iter+1])-sum(oh[iter-9:iter-4]))/sum(oh[iter-9:iter-4])) # Save results mddb.customData.History = {'vol':vh,'obj':oh} mddb.saveAs('Final_design.cae')