MICHAEL FLEMMINGAUGUST 4, 2009

Using a slider crank mechanism to compare simulation abilities of MATLAB and UGS NX

Introduction

Brief Background of Software and Mechanism

CriteriaComparisonRecommendationsConclusion

Previous Research

Dynamic Modeling and Identification of a Slider-Crank Mechanism – Ha, Fung, Chen, Hsien

Kinematics of a slider-crank mechanism – Michael Kearny

Applications of Analytical Method and Computer Technique for Solving Problem of Slider-Crank Mechanism – Phan Quang The

Background - MATLAB

Numerical Analysis SoftwareBase Price: 1,150 USDAdditional Toolboxes

Signal Processing Databases Control Systems Etc.

MATLAB Programming Language

Simulink Toolbox Model-based Design System Linear and Non-linear

Modelling

Background - NX

CAD/CAM/CAE PLM Software Computer-Aided Design Computer-Aided Manufacturing Computer-Aided Engineering Product Lifecycle Managment

Base Price: 8,700 USD3D environment

Background - Mechanism

Modified 4 bar mechanism Ground Crank Connecting Rod Slider 3 Revolute Joints 1 Prismatic Joint

1 Linear Degree of FreedomDriven by Crank or SliderMost common use – Internal Combustion

Engine

Criteria

AccuracyDesign DifficultyModification DifficultyInformationVisualsCost

Design Process - MATLAB

Simulink Block diagram of kinetic equationsMATLAB M-files

1 driving program 1 animations program

Design Process - Simulink

Extensive Block Library Continuous Discontinuous Sources Sinks Math Logic Custom Blocks

Design Process - Simulink

Easily pass information from one equation to another

Divided into subsystems for organization

Create loop equations

Design Process - NX

Individual Part Files for each componentAssembly file

Parts connected with specific mating conditions

Motion Simulation Each joint and link identified Ground link selected Range of motion determined Driving forces applied

Comparison - Accuracy

Both models return same resultsSlider travels equal distance in both

directionsVelocity and Acceleration curves match

0 5 10 15 20 25 30 35 40 45 5015

16

17

18

19

20

21

22

23

24

25Slider Position

Time

mPlots - Position

0 5 10 15 20 25 30 35 40 45 50-5

-4

-3

-2

-1

0

1

2

3

4

5Slider Velocity

Time

m/sPlots - Velocity

0 5 10 15 20 25 30 35 40 45 50-5

-4

-3

-2

-1

0

1

2

3

4Slider Acceleration

Time

m/s2

Plots - Acceleration

Comparison – Design/Modification Difficulty

Comparison – Available Information

Comparison - Visuals

MATLAB 2D animation Upgrade to Virtual Reality

Toolbox for 3D animations. 246-page User Manual

NX 3D animation and design Flightpath Lighting Material Environment

Comparison - Cost

MATLAB Base Price: 1,150 USD Additional Toolboxes: 230 USD

NX Base Price: 8,700 USD Plus Additional Licenses

Recommendations/Conclusions

MICHAEL FLEMMINGAUGUST 4, 2009

Using a slider crank mechanism to compare simulation abilities of MATLAB and UGS NX