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Lecture--newWeek07 - Introduc)on to System Modelling...

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Unformatted text preview: Introduc)on to System Modelling with MapleSim Engineering Design & Graphics Engineering 1C03 Dr. T. E. Doyle Overview •  •  •  •  •  •  •  •  Announcements Project and Course Compe))on System Modelling Goals The Design Process MapleSim for System Modelling Crea)ng and Modelling a Pendulum Crea)ng and Modelling a Piston Crea)ng and Modelling a Simple Gear ­Pair Announcements Engineering 1 Information Fair for Level 2 Program Selection All ENG I students must complete their program choices by early April, 2011. Find out more about the application process and visit with department representatives at the Information Fair! THURSDAY, FEBRUARY 17, 2011 11:30-3:30 p.m. Engineering Technology Building Participating departments/programs include: Chemical Engineering Civil Engineering Computing & Software Electrical & Computer Engineering Engineering & Management Engineering Physics Engineering & Society For more information visit the Eng 1 site on AVENUE. Materials Engineering Mechanical Engineering Bachelor of Technology Program Eng Co-op and Career Services Engineering Student Services Centre for Student Development ISS/MacAbroad Also, star)ng February 28th Engineering 1C03 will have an experien)al learning center opening where students may sign out prototyping kits (KNEX, Lego, Meccano). Project •  Groups (must submit names to IAI this week!!!) •  Specifica)on  ­ Released February 15, 2011. •  Part 1  ­ Research and explain how the read head mechanism of a CD ­ROM drive mechanically works. Submission must have hand sketches or Inventor CAD models of your researched design. Due March 1, 2011 @ 5:00 p.m. via Avenue. •  Part 2  ­ Based upon your group’s given specifica)ons, design a gearing mechanism to convert a fixed rota)onal input to a required linear transla)on. Submit report with complete design with set of engineering drawings and models. Project Course Compe))on •  Tops teams from each term are invited to compete in the Mapleso_ course compe))on. •  Compe))on is held at end of 2nd term. •  Industry, faculty, and community judges •  Addi)onal reasons to compete: –  Design Por`olio for interviews –  Bonus Marks for presen)ng your work, addi)onal bonus for winning. –  Prizes for top groups. System Modelling Goals •  The design process requires itera)on. •  Rarely (prac)cally, never) is a design implemented from start to finish without some form of intermediate tes)ng/valida)on and itera)on. •  MapleSim provides us the capability to model, verify/validate, and visualize our mechanism design. •  Remember, modelling is not the where the design process begins … The Design Process Problem Problem Statement Statement Problem Defini-on (or Framing) 1.  Clarify objec)ves 2.  Establish metrics for objec)ves 3.  Iden)fy constraints 4.  Revise problem statement Conceptual Design 5.  Establish func)ons 6.  Establish requirements (func)on specs) 7.  Establish means for func)ons 8.  Generate Design Alterna)ves 9.  Refine and apply metrics to design alterna)ves 10.  Choose a design Preliminary Design 11.  Model and analyze chosen design 12.  Test and evaluate chosen design Verifica)on Detailed Design 13.  Refine and op)mize chosen design 14.  Assign and fix design details Documenta)on for Final Design (Report, Drawings, Models, etc.) Design Communica-on 15.  Document final design Designed Product Reference: Dym and Lihle, “Engineering Design”, third edi)on. Valida)on MapleSim for System Modelling •  A_er working though the Problem Defini)on (1 ­4), Conceptual Design (5 ­10), and a Preliminary Design (11 ­12), MapleSim may be used to verify incremental por)ons of your system. •  Never start “your design” by plugging numbers into a modelling tool G.I.G.O. •  Once your designs are complete, MapleSim may be used to validate the system. MapleSim Components •  The following are a few of the common MapleSim Elements you will use in your project: Symbol Meaning Symbol Meaning A sta)onary frame with a fixed displacement and orienta)on rela)ve to ground Joint allowing one transla)onal degree of freedom along a given axis A frame with a fixed displacement and orienta)on rela)ve to a rigid body center of mass (CoM) frame Display geometry imported from an .stl file in your 3 ­D model Center of mass (CoM) frame with associated mass and iner)a matrix Display a rectangular prism in your 3 ­D model Joint allowing one rota)onal degree of freedom about a given axis Display a cylinder in your 3 ­D model MapleSim Components: How to Understand Them Beher •  The previous 8 components are only a very small subset of standard MapleSim components. •  To understand how to use any component, select the component, right ­click, select help. •  The component connec)ons are defined along with an explana)on on how to use the component. MapleSim: Pendulum Example 2 ­D Model 3 ­D Model Next: Extend this example with an addi)onal revolute joint in the middle of the pendulum arm. MapleSim: Piston Example •  Consider a pendulum arrangement with: –  mul)ple (3) revolute joints, –  a linearly constrained mass (prisma)c), and –  a force applied about the grounded revolute joint. •  Ideas on how this might be realized? Construc)on Mode Visualiza)on Mode Try Tutorial 4: Modeling a Planar Slider ­Crank Mechanism from MapleSim’s UserGuide MapleSim: Gear Pair Example MapleSim: Gear Pair Example cont’d •  From previous slide: a)  Create gear geometries in Inventor using the Design Accelerator (must have design equa)ons worked out – next lecture). Export Inventor gear geometries as .stl files. b)  Load the provided gear module in MapleSim and import .stl files into MapleSim as the CAD components. Enter design equa)on parameters z1, z2, m. Cascade gear pairs to create gear train. Add probes where necessary. c)  Compile MapleSim 2D model from b) and observe generated graphs along with interac)ve 3D model of system. ...
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