ENGINEERING DESIGN LAB I ENGR-101 FALL 2014 WEEK 8 LECTURE

Richard Primerano, Ph.D.

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REPRESENTING ENGINEERING SYSTEMS SOFTWARE TOOLS IN ENGINEERING NOTES ON FINAL REPORT

REPRESENTING ENGINEERING SYSTEMS Most engineered systems are a complex

interconnection of smaller pieces (subsystems)

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REPRESENTING ENGINEERING SYSTEMS During the conception, design, construction, and

testing of an engineering system, many representations are used Sketches, diagrams Written descriptions Mathematical models (equations) CAD models

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REPRESENTING THE PARTS OF AN AIRPLANE Mechanical CAD drawings and solid models

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REPRESENTING THE PARTS OF AN AIRPLANE Finite element structural models

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REPRESENTING THE PARTS OF AN AIRPLANE Electrical schematics and wiring diagrams

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REPRESENTING THE PARTS OF AN AIRPLANE Hydraulic system schematics and models

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REPRESENTING THE PARTS OF AN AIRPLANE Control system models

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REPRESENTING YOUR RUBE GOLDBERG MACHINE Concept models CAD models Assembly drawings Video recordings Written descriptions

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ABSTRACTED MODELS Intended to show the flow of energy through the

machine.

TOP DOWN VIEW Intended to show the spatial relationships and

relative sizes of events.

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TEXT DESCRIPTIONS

Event # Event Description

1 A ball drops in from Group 5 onto a ramp, which rolls into a cup that is attached to a lever.

2 Once the ball falls into the cup, it causes the other side of the lever to rise. After the lever rises, it releases a toy car.

3 A toy car rolls down a ramp, and knocks over a domino.

4 A domino train of 23 dominos falls, with the final domino falling onto a mouse trap.

5 After the mouse trap is triggered, it pulls a string connected to a catapult.

6 A catapult is released, shooting a ball into a cup located at the start of Group 7’s machine.

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CAD MODELS Represent the actual geometry of the device Could be used to derive fabrication drawings,

assembly drawings…

SOFTWARE TOOLS USED IN ENGINEERING 2D and 3D modeling programs

Creo, Solidworks, Autocad, Inventor Physics simulators

ADAMS, Abacus, ANSYS, Bullet, Havoc General computational software

Matlab, Maple, Mathematica Integrated Development Environments (IDEs)

Eclipse, Netbeans

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USING CAD TOOLS IN AN ITERATIVE PROCESS

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Design

Analyze

DYNAMIC ANALYSIS (USING MSC ADAMS)

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Multibody dynamic simulation tools are used to simulate the interaction of multiple bodies in motion.

Including physics simulators for gaming: Open Dynamics Engine, Havok, Bullet

DYNAMIC ANALYSIS (USING MSC ADAMS) Simulation parameters can be extracted and used to

verify design performance.

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KINEMATIC ANALYSIS (USING PRO/E)

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Kinematic analysis is the analysis of positions and velocities of objects that are constrained with respect to one another.

DYNAMIC ANALYSIS (USING MSC ADAMS)

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Complex assemblies consisting of hundreds of components can be simulated.

This includes contact forces.

STRUCTURAL ANALYSIS (USING PRO/E)

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Finite element analysis (FEA) is used to simulate heat flow and structural properties

COMPUTATIONAL FLUID DYNAMICS

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Used to calculate fluid flows and the interaction of fluid and solid structures

COMPUTATIONAL FLUID DYNAMICS (USING ANSYS CFX)

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COMPUTATIONAL FLUID DYNAMICS (USING ANSYS CFX)

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MULTIPHYSICS SIMULATION (USING COMSOL) Allows the simulation of simultaneous physical

phenomena.

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STRUCTURAL DESIGN (USING AUTODESK REVIT) Provides 2D and 3D drafting Used at all stages of the building design life cycle Free to download from Autodask

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MODELING, ANALYSIS, AND SIMULATION IN MATLAB

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MATLAB is a general-purpose computational package and programming language.

Allows engineers to rapidly develop complex algorithms.

THE FINAL REPORT Due at the start of Week 11 lab

Parts of the report

Machine Overview Event Design Details Machine Setup and Reset Summary

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GRADING COMPONENTS Technical content

Every experiment that was performed should be represented in the report

Grammar and Spelling There should be NO spelling errors or major

grammar errors Structure

The order in which you present material should be logical

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