STEP-Based CAE/CAO Information Exchange
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(2) ), CAO( ), ), AP209( 209). STEP( ), CAE( EXPRESS Schema(. Abstract In the product design process computer-aided engineering and optimization tools are widely utilized in order to reduce the total development time and cost. Since several simulation tools are involved in the process, information losses, omissions, or errors are common and the importance of seamless information exchange among the tools has been increased. In this study ISO STEP standards are adopted to represent the neutral format for CAE/CAO information exchange. The schema of AP209 is used to define the information of finite element analysis and the new schema is proposed to describe the information of structural optimization based on the STEP methodology. The schema is implemented by EXPRESS, information modeling language, and ST-Developer is employed to generate C++ classes and STEP Rose Library by using the schema denoted. To substantiate the proposed approach, the information access interfaces of the finite element modeling software (FEMAP), structural optimization software (GENESIS) and in-house topology optimization program are developed. Examples of the size optimization of a three-bar truss and topology optimization of a MBB beam are shown to validate the information exchange of finite element analysis and structural optimization using STEP standards.. 1.. SR TU V & 1W X YM
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(81) .. 5.2 Fig. 12 10mm Fig. 9 Three-Bar Truss analysis model generated in FEMAP. #16=SIZE_OPTIMIZATION('3ROD Size Optimization', ,(#48,#49,#50),#54,(#56,#58,#60,#62,#64)); #17=MEASURE_VALUE(10000000.,0.,0.1,0.33); #18=ELEMENT_MATERIAL(1.,'Mat',#17); #19=POINT_ELEMENT($,0.,$,$,#20,#18); #20=POINT_ELEMENT_PROPERTY(1.,'property',1.,1.,1.); . . . #28=CARTESIAN_POINT((0.,0.,0.)); #29=NODE(#25,2.,#28,$,#41,$); . . . #42=BOUNDARY_CONDITION_LOGICAL('con','fixed',.T., .T.,.T.,.T.,.T.,.T.); #43=APPLIED_LOAD_STATIC_FORCE('Static Load',15000.,0.,0.,0.,0.,0.); #44=LOAD_NODE(1.,'Load',#33,#43); . . . #53=VARIABLE_PROPERTY_RELATION('+DP3',30.,3.,3., 1.); #54=SIZE_OBJECTIVE('W',20.,'MIN',#55); #55=MASS('W',$,0.); #64=SIZE_CONSTRAINT(25.,0.,-20000.,20000., #65); #65=STRESS('S3','PROD',2.,3.); . . .. Fig. 12 Analysis model of FEMAP. Hkgh 67' <P"0 > zR ij 89_ Slmn 67 <P"_`, 67 "c STEP z ÷·A
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(86) 대한기계학회 2003년도 춘계학술대회 논문집. . R , Z ÷, 2000, “ W !j' S R STEP”, 7! ", C4\ (2) l£, jP#, $%, 1998, “STEP R eRf#Hk gh i”, RÅ CAD/CAM Ã ®M&, ! 3 $ ! 1 ', pp. 48-56 R ß C\] + (3) lZM, 2000, “STEP 67 ?R i”, RQ k S®M (1). Fig. 13 Optimization result of GENESIS. (4) Ting-Kuo Peng, Amy J.C. Trappey, 1998, “A step toward STEP-compatible engineering data management: the data models of product structure and engineering changes”, Robotics and ComputerIntegrated Manufacturing, Vol.14, pp. 89-109 (5) http://www.steptools.com (6) Douglas Schenck, Peter Wilson, 1994, “Information Modeling the EXPRESS Way”, Oxford University Press, Inc. (7) http://www.nist.gov/sc4/step/parts/ (8) , 1996, (9) Martin Hardwick, Alok Mehta, David Spooner and Chris Willis, 1991-2000, “ROSE Library Tutorial Manual”, http//www.steptools.com, STEP Tools, Inc. (10) Martin Hardwick, 1999, “Making Business Objects Using EXPRESS-X”, http//www.steptools.com, STEP Tools, Inc. (11) Edward J. Haug, Jasbir S. Arora, 1979, “Applied Optimal Design”, John Wiley & Sons, Inc., pp. 242245. Fig. 14 Optimization result of Research Code. Vz 89~ GENESIS > Eo p; <PA 67 z STEP _ ÷· } "
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