Road Vibration Simulator EGR 448: Senior Design Carolyn Bassetti - - PowerPoint PPT Presentation

Road Vibration Simulator

EGR 448: Senior Design

Carolyn Bassetti Sarah Brady Mandy Frederick Jessica Irons Matt Windon

http://www.technokit.it/prodotto/tkt99%20J%20ing.htm

The Big Plan

Problem Definition

• Project Objective: To design and

implement a versatile device and corresponding classroom experiments for use in the Miami University Vibrations Laboratory to simulate road vibrations felt by vehicles during normal operation.

Team Objective

• Hands on Education
• Intuitive Experiments
• Supplement Vibrations Course

– Enhance Educational Experience

• Mobile, Independent Equipment

Final Design of Experiment

OUTPUTS CAR INPUTS COMPUTER

Past/Present/Future Hardware

• PAST

– Identified Necessary Components

• Structure (Car)
• Input Force (Shaker)
• Measurement Devices (Load Cell, Accelerometers)

– Selected Type of Components

• Entire Car vs. Scaled Model vs. Car Components
• Impact Hammer vs. Shaker
• PRESENT

– Researched Prices/ Features of Actual Components (Car, Shaker) – Selected Final Components To Purchase (Car, Shaker) – Purchased Components (Car, Shaker)

• FUTURE

– Research, Selection, Purchasing of Components (Load Cell) – Test Components (Car, Shaker, Load Cell)

Past/Present/Future Software

• PAST

– Identified Necessary Capabilities of Software

• Data Acquisition and Analysis

– Selected Type of Software

• Matlab vs. LabView
• PRESENT

– Created Simulink model and Matlab program

• Used to look at the differences in hammer vs. shaker data

– Created overall GUI design – Created mini models of working GUI components – Wrote Matlab Code for Data Acquisition

• FUTURE

– Create entire working GUI – Continue writing code for data acquisition – Write code for data analysis

Past/Present/Future Experiments

• PAST

– Conducted background research on the importance

• f vibration in design
• PRESENT

– Researched vibrations experiments currently in use – Developed basic ideas for 2-3 experiments – Began documenting background information to go along with the experiments

• FUTURE

– Develop experiments – Document experimental procedures – Document experimental questions – Conduct user tests – Suggest relevant changes in experiments/ documentation

Flow Chart

Car

• Scale

– 1/10th

• Limited placement of accelerometers & actuator
• Accelerometers add substantial percentage of weight
• Data at consistently high range

– Full Size Parts

• Data at consistently low range

– 1/5th

• Data in most feasible range to analyze
• 1/5th more similar to real car in terms of weight,

engine, tires & response

• Whole Car vs. Chassis & Suspension System
• Less expensive
• Less intuitive

Car Selection Matrix

15 4 3 4 2 2 Build our own-H frame and suspension 17 3 4 4 3 3 Victory Speedway- parts only 15 3 3 3 3 3 GB Direct- parts only 19 3 4 4 4 4 Alro Racing- whole car

Total: Cost Suspension Metal Construction Functionality Intuitiveness

Selection Matrix (based on a scale of 1 – 5)

TKT99 Junior

http://www.technokit.it/prodotto/tkt99%20J%20ing.htm

Car Specifications:

Length: 35” Width: 14.5” Height:10.5” Weight: 21lbs

Support Structure

Input & Output

• Input

– Shaker – Amplifier – Cooling System

• Output

– Load Cell (output from shaker to car) – Accelerometer (output from car)

http://www.mbdynamics.com/modal.htm

Simulink Experiments

• Shows the difference between random input (shaker)

and impulse input (hammer)

Software: DAQ Toolbox

• DAQ (Data Acquisition) Toolbox

– Within Matlab

Signal Conditioning Box: Analog Converting Card in Computer: Analog Digital DAQ Toolbox: Digital MATLAB Code To Analyze Data (GUI is used to initialize this): Digital Accelerometers: Analog

Software: GUIDE

• GUIDE (Graphical User Interface Development

Environment)

– Within Matlab

http://www.mathworks.com

GUI (Graphical User Interface)

• Examples

– Pull-down menu – Graph

• Ergonomic Principles

for Design

– Simplicity – Consistency – Immediate Feedback – Intuition

Classroom Experiments

• Key Objective: Intuitive Learning
• Lab 1- Introduction to Equipment

& Transfer Functions

• Lab 2- Analysis of Shaker

Location

– Full Size Car Comparison

• Possible Lab 3- Data Collection

and Analysis Issues

Supporting Issues

• Safety

– Lab Manual

• Environmental

– Self-contained System – Cooling System

• Cost

$8,744.00 Total: not purchased Support Structure not purchased Load Cell 707 Accessories Kit 341 Cooling System 3266 Amplifier 3900 Shaker 530 Car BOM - $

Timeline

ID Task Name Start Finish 1 Design Teams Assigned Tue 9/9/03 Tue 9/9/03 2 Visit UC Vibrations Laboratory Sat 9/20/03 Sat 9/20/03 3 Vibrations in a Nutshell Presentation Fri 9/26/03 Fri 9/26/03 4 Proposal to Dr. Ettouney Fri 9/26/03 Fri 9/26/03 5 Preliminary Presentation Thu 10/9/03 Thu 10/9/03 6 Preliminary Report Fri 10/3/03 Mon 10/13/03 7 Research Tue 9/9/03 Fri 10/31/03 8 Previous Designs Tue 9/9/03 Fri 10/31/03 9 Alternatives to hydraulics Tue 9/9/03 Fri 10/31/03 10 Prices of shakers and other components Tue 9/9/03 Fri 10/31/03 11 Model Cars Tue 9/9/03 Fri 10/31/03 12 Design Selection Wed 10/22/03 Fri 11/14/03 13 Purchase Components Mon 11/17/03 Fri 1/23/04 14 Test Components Mon 1/26/04 Fri 3/26/04 15 Assembly of Apparatus Mon 3/29/04 Fri 4/16/04 16 Develop/Integrate Data Collection/Analysis So Mon 11/3/03 Fri 4/16/04 17 Test Software and Experimental Testing Tech Mon 3/29/04 Fri 4/23/04 18 Writing of Final Report Mon 11/3/03 Fri 4/30/04 19 Write Lab Manual Mon 11/17/03 Fri 4/16/04 20 Run User Test on Current EGR 315 Students Fri 4/16/04 Thu 4/22/04 21 Post Information to the Internet Fri 4/23/04 Tue 4/27/04 22 Make Design Information Available to Others Mon 4/19/04 Wed 4/21/04 September October November December January February March April

EGR 449 Deliverables

Wed 4/21 Mon 4/19 3 days Post Information to the Internet Thu 4/22 Fri 4/16 5 days Run User Test on EGR 315 Students Fri 4/16 Mon 11/17 110 days Write Lab Manual Fri 4/30 Mon 11/3 130 days Writing of Final Report Fri 4/16 Mon 11/3 120 days Develop Data Collection/Analysis Software Fri 4/16 Mon 3/29 15 days Assembly of Apparatus Fri 3/26 Mon 1/26 45 days Test Components Finish Date Start Date Duration [Day] Task Name

Acknowledgments

• MB Dynamics
• ALRO Racing
• Dr. Khan
• Dr. Shukla

Questions ??

http://www.technokit.it/prodotto/tkt99%20J%20ing.htm