design of a small scale road vibration simulator presentation revised.pdfdesign of a small scale...
TRANSCRIPT
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Design of a Small Scale Road Vibration Simulator
Design Team: Carolyn BassettiSarah BradyAmanda FrederickJessica IronsMatt Windon
Advisor: Dr. Amit Shukla
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Presentation Overview
Project IntroductionSummary of EGR 448 WorkDesign Progress
Hardware, Software, ExperimentsFeedback and ImprovementSupporting IssuesSuggested Future WorkMeasurable Outcome
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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
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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 operation.
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Project Introduction:Establishment of Objectives and Criteria
Constraints:Limited spaceLimited timeLimited funds
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Project Introduction:Project Deliverables
Road vibrations simulator experimental setupUser manualTwo lab experiments GUI for data acquisition and analysisUser test feedback from EGR 315studentsWebsite
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Summary of EGR 448 Work
HARDWAREResearched components (sensor, actuator, system model)Selected components (accelerometers, shaker, 1/5 scale car)Purchased components
SOFTWAREIdentified necessary capabilities (data acquisition and analysis)Selected software (Matlab)Created overall goal for GUICreated mini GUI components
EXPERIMENTSResearched the importance of vibrations in designDeveloped ideas for 2 laboratory experiments
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Design Progress: HardwareExperimental Flow and Setup
Proposed Experimental Setup Final Experimental Setup
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Design Progress: SoftwareGraphical User Interface
Proposed GUI Final GUI
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Design Progress: SoftwareData 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 FileZoompls
Adds mini ‘Zoom’ window GUI to users GUI
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Design Progress: ExperimentsLab 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
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Feedback and Improvements: Testing and Evaluation
User TestsPre-Lab SurveysImmediate On Site FeedbackPost-Lab SurveysLab Reports/QuestionsVideo
EvaluationChange lab/safety manuals as per student and faculty suggestion
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Feedback and Improvements:Iterative Design Update Process
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Feedback and Improvements: User Manual, Lab 1, and Lab 2 Flow and Format Criticisms and Remedies
Changed number of accelerometers needed in equipmentlist to two
List number of accelerometers are needed for particularexperiment, not how many are available
Wrote in procedure to refer to User ManualAdd dismantling instructions
Added a screenshot picture in the procedure so studentsknow where to look on the computer screen
The “active” box and “waveform” pull down in Matlab arehard to find
Reworded sections that seemed unclear or wordySections 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 of 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 partsNo pictures or figures
RemedyDr. BVK and EGR 315 User Test Comments
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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.
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Feedback and Improvements: Video
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Feedback and Improvements:GUI Improvements
Improved AccuracyDynamic range of graphsWindowing
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Feedback and Improvements: GUI Improvements
Zoom capability
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Supporting Issues:Market Issues
Researched companies who sell equipment
Ensured unique productReinforced market need
Researched other university vibrations projects
Reinforced educational need
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Supporting Issues:Cost
8,744.00Total:707.00Accessories Kit341.00Cooling System3266.00Amplifier3900.00Shaker530.00Car
Bill Of Materials [$]
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Supporting Issues:GUI Ergonomics
SimplicityConsistencyImmediate FeedbackIntuitive
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Supporting Issues:Safety
High voltage electronicsSensitive equipment
User manual with extensive safety sectionSafety notes throughout lab procedure
Support structure built by teamSteps taken to ensure user safety
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Supporting Issues:Professional Ethics
Appropriately referenced resourcesTeam members carried through their individual responsibilities in a timely mannerAdhered to contract signed at the beginning of the 2004 semesterDocumented design process to make tracing errors easier
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Suggested Future Work
Add additional capabilities added to GUIOn/Off Windowing CapabilityAveraging Capability
Create additional lab manuals (corresponding to additional GUI capabilities)Enable experiment to be run from a remote location
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Measurable Outcomes:Project Deliverables
Road vibrations simulator experimental setupUser manualTwo lab experiments GUI for data acquisition and analysisUser test feedback from EGR 315studentsWebsite
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Measurable Outcomes:Website
Created website showcasing design projectUploaded lab manuals for other institutions to be able to access them if they wish to implement a similar experimentwww.users.muohio.edu/bradyse (current)www.users.muohio.edu/shuklaa/vibrations.html(future)
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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
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ReferencesALRO Racing: http://www.alroracingusa.com/Data Physics: http://www.dataphysic.co.uk/html/shakers.htmDerritron: http://www.derritron.com/Driving ergonomics: http://www.ohcow.on.ca/resources/handbooks/ergonomics_driving/Ergonomics_And_Driving.pdfFG Modelsport: http://www.fg-america.com/site/lv1/productlines.htmGB Direct: http://www.gbdirectusa.com/GUI Ergonomics: http://cognitivevent.com/gui.htmlGUI Ergonomics: http://www.omnica.com/omniview_industrial_design2.htmHarm Racing: http://www.harm-racing.de/Cars_Street.asp?Lang=ENIntuition Information: http://www.mtnmath.com/whatrh/node105.htmlLabworks, Inc: http://www.labworks-inc.comLing Dynamics: http://www.lds-group.com/Math Works: www.mathworks.comMathworks. Data Acquisition Toolbox: For Use with Matlab User’s Guide. Version 2. 2001.
The Mathworks, Inc. Natick , MA . MB Dynamics: www.mbdynamics.comModal Analysis: http://www.mecha.uni-stuttgart.de/Forschung/forschung_exp_meth/forschung_expmodal_en.htmModal Analysis: http://www.gmi.edu/~drussell/GMI-Acoustics/Modal.htmlModal Analysis: http://www.mts.com/nvd/PDF/1992_AMATLST.pdfModal Exciters: http://www.bksv.com/2329.htmNational Instruments: www.nationalinstruments.comProfessional Ethics: http://ethics.tamu.edu/ethics/shuttle/shuttle1.htmRandom Vibration: http://www.algor.com/products/analysis_types/linear_dynamics/random_vibration.aspRDP Corporation: http://www.rdp-corp.com/Shaker Selection: http:/autotestreport.com/2002_articles/09_shaker.htmTechnokit: http://www.technokit.itVictory Speedway : http://www.victoryspeedway.com/
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Questions?