How To Model Space Frame Structure In Cad 3D Software

Transcription

1 PARAMETRIC MODELING OF SPACE FRAME STRUCTURES STUDY OF COMPARISON BETWEEN TWO METHODS EMPLOYING TWO DIFFERENT SOFTWARE TOOLS: CATIA V5 DSS and GRASSHOPPER PLUGIN 1/16

2 TABLE OF CONTENTS - BIM and parametric modeling - Modeling techniques - Modeling techniques comparison - Employed software - Space frames examples - PYRAMITEC model - FREE FORM model creation modification - Conclusions 2/16

3 Introduction BIM and parametric modeling PROTOTYPE DESIGN PARAMETER ADJUSTMENT DESIGN VERIFICATION MAINTAIN BIM MODEL BUILD 3/16

4 Introduction modeling techniques Direct Modeling Parametric Modeling Constraints Generative Design Feature Based Modeling Tree structure Node based editor SIMPLE COMPLICATED 4/16

5 WARSAW DEPARTMENT UNIVERSITY OF STRUCTURAL OF TECHNOLOGY, MECHANICS FACULTY AND COMPUTER OF CIVIL ENGINEERING AIDED ENGINEERING DEPARTMENT WARSAW UNIVERSITY OF STRUCTURAL OF TECHNOLOGY MECHANICS AND COMPUTER AIDED ENGINEERING Introduction - modeling techniques comparison Time [min.] Modeling time in AutoCAD 2007 Modeling time in Catia V5 0 1 model 2 models 10 models 30 models 5/16

6 Introduction - employed software CATIA V5 DSS GRASSHOPPER 3D plug-in 1970/1980 CAD/CAM/CAE PLM Aircraft Industry Automotive Industry 2007 VPL for Rhinoceros 3D CAD Generative Algorithms Architecture Design DIGITAL PROJECT BIM software 2003 OTHER software PLUG-INS 6/16

7 Introduction - space frames examples PYRAMITEC Modular system Parts Structural nodes 2- Layer structure Drawing Source: Metal structures Part II, M Łubiński, W. Żółtowski 7/16

8 Introduction- Space frames examples FREE FORM Grid 3D surface 1- Layer structure Welded members Photo Source: 8/16

9 PYRAMITEC model PRODUCT RELATIONS CONSTRAINTS PARAMETERS PARTS Complete model view with tree structure on the left. Model is saved with.catproduct extension which means that it consists of a set of predefined parts that are assembled together and can be modified in the Part Design module. 9/16

10 PYRAMITEC model PART PARAMETERS CONSTRAINTS FEATURES PLANES SKETCHES Tree structure opened at the L-section part. Sketch of the section is visibe in the editable mode. Diagonaly conecting pipe and its surface cut at the joint are visibe. 10/16

11 L-SECTION PART 20th INTERNATIONAL CONFERENCE ON PYRAMITEC model WARSAW DEPARTMENT UNIVERSITY OF STRUCTURAL OF TECHNOLOGY, MECHANICS FACULTY AND COMPUTER OF CIVIL ENGINEERING AIDED ENGINEERING DEPARTMENT WARSAW UNIVERSITY OF STRUCTURAL OF TECHNOLOGY MECHANICS AND COMPUTER AIDED ENGINEERING PARAMETERS CONSTRAINTS HOLE FEATURES SPLIT FEATURES PAD FEATURE SKETCH OF L-SECTION HOLE feature in the history based modeling concerns previous feature pad. Main attribute for this feature is limiting surface for the hole. PLANE 11/16

12 PYRAMITEC model PIPE PART JOINT PARAMETERS CONSTRAINTS COUPLING ATTRIBUTE MULTI-SECTION SOLID FEATURE SKETCHES OF SECTIONS Flattened tip of the pipe memeber in joint of the lower layer of space frame structure. Connecting element that enables welding is constructed using one feature and auxiliary sketches. PLANES 12/16

13 20th INTERNATIONAL CONFERENCE ON DEPARTMENT WARSAW UNIVERSITY OF STRUCTURAL OF TECHNOLOGY, MECHANICSFACULTY AND COMPUTER OF CIVIL ENGINEERING AIDED ENGINEERING DEPARTMENT WARSAW UNIVERSITY OF STRUCTURAL OF TECHNOLOGY MECHANICS AND COMPUTER AIDED ENGINEERING FREE FORM model creation SPACE FRAME MODEL SURFACE EXTRSION NORMAL GRID EXTRUSION TRIANGLE GRID PROJECTION SURFACE PROFILES Profiles for surface enabe shape control. They can be modified, aded or deleted. Surface is created with loft operation within GRASSHOPPER. Triangle grid is projected onto the surface. Grid extrusion In normal direction allows structure height control. Another extrusion defined by certain vector adds thickness to the grid model. 13/16

14 FREE FORM model modification SPACE FRAME MODEL GENERATOR SWITCH ON PROFILES ADD OR REMOVE MODIFICATION CONTROL POINTS SWITCH ON GENERATOR SWITCH OFF PROFILES 14/16

15 CONCLUSIONS 20th INTERNATIONAL CONFERENCE ON CONCEPTUAL PHASE ELASTIC TOOL IDENTIFICATION OF DESIGN PARAMETERS FINITE ELEMENT ANALYSIS VERIFICATION EASY DATA TRANSFER CONNECTION TO BIM PLUG - INS INTERFACE ADAPTATION 15/16

16 THANK YOU FOR YOUR ATTENTION! 16/16