S10-1 PAT328, Section 10, September 2004 Copyright 2004 MSC.Software Corporation TOPOLOGY OPTIMIZATION

S10-2 PAT328, Section 10, September 2004 Copyright 2004 MSC.Software Corporation

S10-3 PAT328, Section 10, September 2004 Copyright 2004 MSC.Software Corporation TOPOLOGY OPTIMIZATION n A new topology optimization method is introduced in MSC.Nastran 2005 u This new topology optimization enhancement in SOL 200 finds an optimal distribution of material, given the package space, loads, and boundary conditions. u Beta release MSC.Nastran 2005

S10-4 PAT328, Section 10, September 2004 Copyright 2004 MSC.Software Corporation TOPOLOGY OPTIMIZATION CAPABILITY n Topology Designable Elements u SOL200 can topologically design any element with a property that references an isotropic material (MAT1), e.g., CROD, CBAR, CBEAM, CBEND, CTRIA3, CTRIA6, CTRIAR, CQUAD4, CQUAD8, CQUADR, CSHEAR, CHEXA, CTETRA, CPENTA, and CWELD n Multidisciplinary Analysis Types u Support all SOL200 existing analysis types: statics, normal modes, buckling, direct frequency, modal frequency, modal transient, complex eigenvalue, flutter and static aeroelasticity

S10-5 PAT328, Section 10, September 2004 Copyright 2004 MSC.Software Corporation TOPOLOGY OPTIMIZATION ENTRIES n Design Responses, Objective, and Constraints u DRESP1- the analysis responses directly from an MSC.Nastran analysis. Such as compliance, mass fraction, displacement, stress, eigenvalue, etc. u DRESP2 – a synthetic response that utilizes the equation input features in MSC.Nastran u DRESP3 – an external response that is evaluated by invoking an external (to MSC.Nastran) process via an application programming interface (API) u Any DREPS1/2/3 can be the topology design objective and/or constraints

S10-6 PAT328, Section 10, September 2004 Copyright 2004 MSC.Software Corporation PATRAN IMPLEMENTATION n MSC.Patrans Nastran preference has been enhanced to support the topology optimization in SOL 200 u Derived from OPTISHAPE preference u Retained some key features of OPTISHAPE preference u More consistent look & feel u More robust infrastructure support l Analysis types, element properties, etc.

S10-7 PAT328, Section 10, September 2004 Copyright 2004 MSC.Software Corporation PATRAN INTERFACE n Customized Solution option has been added in the Analysis form u Main entry to topology optimization

S10-8 PAT328, Section 10, September 2004 Copyright 2004 MSC.Software Corporation PATRAN INTERFACE n Customized Solutions option is used to activate the topology optimization runs u Default is off – normal SOL 200 optimization run Default – Normal SOL 200 run Topology optimization run

S10-9 PAT328, Section 10, September 2004 Copyright 2004 MSC.Software Corporation DESIGN DOMAIN n Design Domain option is used to define the design domain u Using element properties

S10-10 PAT328, Section 10, September 2004 Copyright 2004 MSC.Software Corporation OBJECTIVE AND CONSTRAINTS n Objective_Constraints option is used to define the optimization objectives and constraints

S10-11 PAT328, Section 10, September 2004 Copyright 2004 MSC.Software Corporation OPTIMIZATION CONTROL n Optimization Control option is used to define the optimization control parameters

S10-12 PAT328, Section 10, September 2004 Copyright 2004 MSC.Software Corporation DISPLAYING OPTIMIZATION RESULTS n MSC.Nastran produces a file with.des extension n This file contains the resulting optimal element density distribution. n MSC.Patran 2005 only supports post-processing of 2D optimization results. Support of 3D optimization results is planned for 2005R2.

S10-13 PAT328, Section 10, September 2004 Copyright 2004 MSC.Software Corporation POST-PROCESSING OPTIMIZATION RESULTS n Importing optimization results 1. Under File/Import…, select Results and Patran 2.els… 2. Select the template named topo.res_tmpl. 3. Select the results file 1 2 3

S10-14 PAT328, Section 10, September 2004 Copyright 2004 MSC.Software Corporation POST-PROCESSING OPTIMIZATION RESULTS n Displaying optimization results u Go to Results/Create/Fringe u Select Plot Options u Set Averaging Definition Domain to None and Apply

S10-15 PAT328, Section 10, September 2004 Copyright 2004 MSC.Software Corporation ELEMENT DENSITY DISTRIBUTION

S10-16 PAT328, Section 10, September 2004 Copyright 2004 MSC.Software Corporation EXAMPLES n Michell Truss n Bicycle Frame n Bonnet Structure n 3D Beam n Spare Tire Mount n Pump Lid

S10-17 PAT328, Section 10, September 2004 Copyright 2004 MSC.Software Corporation MICHELL TRUSS

S10-18 PAT328, Section 10, September 2004 Copyright 2004 MSC.Software Corporation BICYCLE FRAME

S10-19 PAT328, Section 10, September 2004 Copyright 2004 MSC.Software Corporation BONNET STRUCTURE

S10-20 PAT328, Section 10, September 2004 Copyright 2004 MSC.Software Corporation 3D BEAM

S10-21 PAT328, Section 10, September 2004 Copyright 2004 MSC.Software Corporation SPARE TIRE MOUNT

S10-22 PAT328, Section 10, September 2004 Copyright 2004 MSC.Software Corporation PUMP LID

S10-23 PAT328, Section 10, September 2004 Copyright 2004 MSC.Software Corporation EXERCISE Perform Workshop 9 Topology Optimization in your exercise workbook

S10-24 PAT328, Section 10, September 2004 Copyright 2004 MSC.Software Corporation