Computer Aided Design CAD course Master in Aerospace and Mechanical Engineering 1 Computer Aided Design Service... Eric Béchet (it's me !) Engineering studies in Nancy (Fr.)  Ph.D in Montréal (Can.)  Academic career in Nantes as Post-doc then ass. Prof. in  Metz (Fr.) then Liège... Christophe Leblanc Assistant ( Ph.D. student ) at our university  Website http://www.cgeo.ulg.ac.be/CAO Contacts : [email protected] 2 Computer Aided Design Procedures 12 Ex-Cathedra lectures (~2h except for the 1st)  Practical sessions  On the NX CAD software (5 4h-sessions)  Programming (8 2h-sessions)  Practical assessment : practical works (pw) are  rated. Final test about theory (tt) – Jan./Sept.  The practical sessions, the project and the final  test are all mandatory, with over 8/20 to pass. The final mark m=pw/3 + 2tt/3, over 10 to pass & get the credits for the course. 3 Computer Aided Design Procedures Lectures are given on Tuesday, 2 PM – Lecture  room is O1 ( B37 bldg.) Begins today (exceptionally lasts 4h !), then  Sept. 26, Oct. 3, 10, 17, 24; Nov. 7, 14, 21, 28,  Dec. 5, 14, 19 Practical work begins Sept. 26th after the course  (check website for more dates & info) It is organized by groups of around 20 students  formed in accordance with availabilities. Any question : I am available mostly Fridays,  appointment via email or phone : 04-366-9165 Office : Bldg B52 +2/438 4 Computer Aided Design Outline (1st few classes) Introduction  Brief history  Some basics about solid modeling  Parametric forms  Curves  Surfaces  Implicit forms  Plane curves et surfaces  Implicit volume modeling  5 Computer Aided Design Outline (whole course) Interpolation and polynomial approximation  Cubic splines  Bézier curves  B-Splines  Curves and rational surfaces  In-depth B-REP models  6 Computer Aided Design Introduction CAD/CAM – Computer Aided Design / Computer Aided Manufacturing Development since the 1950s-1960s  Iso Schoenberg (at U-Wisconsin) – splines (40's)  First « interactive » CAD graphic engine at the MIT  (I. Sutherland, Sketchpad) – 60's James Ferguson (at Boeing) – splines (60's)  Paul De Casteljau (at Citroën) – Bézier curves (50's)  Pierre Bézier (at Renault) – '' ''  Carl De Boor (at GM / U-Wisconsin) – B-Splines (70's)  Catia, Unigraphics (now Siemens NX) date back to the mid-70’s,  emergence of 3d modeling kernels on mainframes. Huge expansion in the 80’s with cheap personal  computers becoming ubiquitous. 7 Computer Aided Design Introduction Sketchpad (Ivan Sutherland) – 1963  8 Computer Aided Design Introduction Old mathematical and theoretical bases  Practical framework has been developed  because of industrial needs. In return, it has contributed at the theoretical  level. 9 Computer Aided Design Basics 10