Design of a Small Scale Road Vibration Simulator Design Team: - - PowerPoint PPT Presentation

Design of a Small Scale Road Vibration Simulator

Design Team: Carolyn Bassetti Sarah Brady Amanda Frederick Jessica Irons Matt Windon Advisor:

• Dr. Amit Shukla

Presentation Overview

Project Introduction Summary of EGR 448 Work Design Progress Hardware, Software, Experiments Feedback and Improvement Supporting Issues Suggested Future Work Measurable Outcome

Problem Statement: Miami

University School of Engineering and Applied Science does not have a lab to reinforce the topics learned in the Mechanical Vibrations Course (MME 315).

Project Introduction:

Establishment of Objectives and Criteria

Project Introduction:

Establishment of Objectives and Criteria

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

• peration.

Project Introduction:

Establishment of Objectives and Criteria

Constraints: Limited space Limited time Limited funds

Project Introduction:

Project Deliverables

Road vibrations simulator experimental setup User manual Two lab experiments GUI for data acquisition and analysis User test feedback from EGR 315 students Website

Summary of EGR 448 Work

HARDWARE Researched components (sensor, actuator, system model) Selected components (accelerometers, shaker, 1/5 scale car) Purchased components SOFTWARE Identified necessary capabilities (data acquisition and analysis) Selected software (Matlab) Created overall goal for GUI Created mini GUI components EXPERIMENTS Researched the importance of vibrations in design Developed ideas for 2 laboratory experiments

Design Progress: Hardware

Experimental Flow and Setup

Proposed Experimental Setup Final Experimental Setup

Design Progress: Software

Graphical User Interface

Proposed GUI Final GUI

Design Progress: Software

Data Acquisition and Analysis Logic

Matlab File FFTMSPEC Matlab File CommunicationWithHardware Matlab File TFunctionWithHardwareInput Matlab File WorkingWithHardwareGUI Opens lines of communication to allow the computer to receive data from the signal conditioning board Converts the time domain data into the frequency domain relevant to the transfer function by means of the Fourier transform Computes the transfer functions from the frequency domain data Stores user inputs and plots graphs from data collected Matlab File Zoompls Adds mini ‘Zoom’ window GUI to users GUI

Design Progress: Experiments

Lab 1 and Lab 2 Goals

Lab 1 Goal: Introduce students to

fundamentals of experimental vibrations:

Accelerometer use, actuator use, force

response graphs, transfer functions

Lab 2 Goal: Analyze changes in system

parameters:

Using multiple accelerometers and adding

weight to the system

Feedback and Improvements:

Testing and Evaluation

User Tests Pre-Lab Surveys Immediate On Site Feedback Post-Lab Surveys Lab Reports/Questions Video Evaluation Change lab/safety manuals as per student

and faculty suggestion

Feedback and Improvements:

Iterative Design Update Process

Feedback and Improvements:

User Manual, Lab 1, and Lab 2 Flow and Format Criticisms and Remedies

Changed number of accelerometers needed in equipment list to two List number of accelerometers are needed for particular experiment, not how many are available Wrote in procedure to refer to User Manual Add dismantling instructions Added a screenshot picture in the procedure so students know where to look on the computer screen The “active” box and “waveform” pull down in Matlab are hard to find Reworded sections that seemed unclear or wordy Sections of background information are difficult to read Added “s” to designate location on bottom side of chassis for stinger position Mark the location for the stinger attachment on the bottom

• f the chassis

Added note saying to plug cords into analog input part analog input Add that the analog input portion of the signal conditioning board is used Added note saying white cords go with larger accelerometers Say which color cords go with which accelerometers Added note in amplifier attachment section to not touch back of amplifier Add warning note saying to not touch the back of the amplifier Added pictures with arrows to relevant parts No pictures or figures Remedy

• Dr. BVK and EGR 315 User Test Comments

Feedback and Improvements:

Selected Survey Questions and Answers

1.

What do you feel is the importance of conducting experiments within a vibrations course?

a.

It can help describe what problems can occur as a result of

• vibrations. This enforces why the study of vibrations is important.

You can also see how theory matches up with real results.

2.

Do you feel the background information was too lengthy or insufficient? Was the background information necessary?

a.

The background information is extremely important. This is the first time I have seen any of this equipment and the background information helped me to know how to use it properly.

3.

Was the purpose of the experiment clear?

a.

The experiment was meant to be an introduction to the equipment and the Matlab program. I thought it did a good job of accomplishing this.

Feedback and Improvements:

Video

Feedback and Improvements:

GUI Improvements

Improved Accuracy Dynamic range of graphs Windowing

Feedback and Improvements:

GUI Improvements

Zoom capability

Supporting Issues:

Market Issues

Researched companies who sell

equipment

Ensured unique product Reinforced market need Researched other university vibrations

projects

Reinforced educational need

Supporting Issues:

Cost

8,744.00 Total: 707.00 Accessories Kit 341.00 Cooling System 3266.00 Amplifier 3900.00 Shaker 530.00 Car Bill Of Materials [$]

Supporting Issues:

GUI Ergonomics

Simplicity Consistency Immediate Feedback Intuitive

Supporting Issues:

Safety

High voltage electronics Sensitive equipment User manual with extensive safety

section

Safety notes throughout lab procedure Support structure built by team Steps taken to ensure user safety

Supporting Issues:

Professional Ethics

Appropriately referenced resources Team members carried through their

individual responsibilities in a timely manner

Adhered to contract signed at the

beginning of the 2004 semester

Documented design process to make

tracing errors easier

Suggested Future Work

Add additional capabilities added to GUI On/Off Windowing Capability Averaging Capability Create additional lab manuals

(corresponding to additional GUI capabilities)

Enable experiment to be run from a remote

location

Measurable Outcomes:

Project Deliverables

Road vibrations simulator experimental setup User manual Two lab experiments GUI for data acquisition and analysis User test feedback from EGR 315 students Website

Measurable Outcomes:

Website

Created website showcasing design project Uploaded lab manuals for other institutions to be

able to access them if they wish to implement a similar experiment

www.users.muohio.edu/bradyse (current) www.users.muohio.edu/shuklaa/vibrations.html

(future)

Acknowledgements

• Miami University School of Engineering and Applied Science—Equipment funding
• Jeff Peterson- Miami University Lab Coordinator and Technician—for his help in

the machine shop and with supplies

• Ron Hopkins & Alro Racing USA—in in purchase of Technokit TKT99junior
• Maureen Sharp & MB Dynamics—in purchase of Modal 50A shaker
• Dr. Fazeel Khan—for introducing us to the world of small scale cars
• Mike Gottshall- student—for his help in adjustments made to the support

structure

• Ben Van Lear- student—for his help in the Machine Shop
• Dr. Michael Bailey-VanKuren—for his help in editing our lab manuals to make

them more user friendly and easier to understand

• The EGR 315: Mechanical Vibrations students: Adam Donawerth, Dave Laux,

Robert Petrochic, Richard Titas, Andrew Walker–for performing user tests

References

• ALRO Racing: http://www.alroracingusa.com/
• Data Physics: http://www.dataphysic.co.uk/html/shakers.htm
• Derritron: http://www.derritron.com/
• Driving ergonomics: http://www.ohcow.on.ca/resources/handbooks/ergonomics_driving/Ergonomics_And_Driving.pdf
• FG Modelsport: http://www.fg-america.com/site/lv1/productlines.htm
• GB Direct: http://www.gbdirectusa.com/
• GUI Ergonomics: http://cognitivevent.com/gui.html
• GUI Ergonomics: http://www.omnica.com/omniview_industrial_design2.htm
• Harm Racing: http://www.harm-racing.de/Cars_Street.asp?Lang=EN
• Intuition Information: http://www.mtnmath.com/whatrh/node105.html
• Labworks, Inc: http://www.labworks-inc.com
• Ling Dynamics: http://www.lds-group.com/
• Math Works: www.mathworks.com
• Mathworks. Data Acquisition Toolbox: For Use with Matlab User’s Guide. Version 2. 2001.

The Mathworks, Inc. Natick , MA .

• MB Dynamics: www.mbdynamics.com
• Modal Analysis: http://www.mecha.uni-stuttgart.de/Forschung/forschung_exp_meth/forschung_expmodal_en.htm
• Modal Analysis: http://www.gmi.edu/~drussell/GMI-Acoustics/Modal.html
• Modal Analysis: http://www.mts.com/nvd/PDF/1992_AMATLST.pdf
• Modal Exciters: http://www.bksv.com/2329.htm
• National Instruments: www.nationalinstruments.com
• Professional Ethics: http://ethics.tamu.edu/ethics/shuttle/shuttle1.htm
• Random Vibration: http://www.algor.com/products/analysis_types/linear_dynamics/random_vibration.asp
• RDP Corporation: http://www.rdp-corp.com/
• Shaker Selection: http:/autotestreport.com/2002_articles/09_shaker.htm
• Technokit: http://www.technokit.it
• Victory Speedway : http://www.victoryspeedway.com/

Questions?