Mechanism Feasibility Design Task · PDF file• Design of a multi-stage spur/helical gear...

Mechanism Feasibility Design TaskDr. JamesGopsill

2017

1Design & Manufacture 2 – Mechanism Feasibility DesignLecture 6

Contents

1. BeforeEaster2. Submission

2

2017

Design & Manufacture 2 – Mechanism Feasibility DesignLecture 6

Before Easter

Introducedyouto:• Typesofgearandtheirapplication• Designofamulti-stagespur/helical

gearset

Whereyoushouldbeat:• Evaluatedaspurandhelicalgear

ratios• Selectedonetocarryforward• Createdgearboxarrangementin

CAD

3

2017

ProductDesignSpecification

ConceptDesign

ConceptSelection

DeploymentModelling

Motor,GearRatio&DampingSelection

GearboxDesign

Stage-Gate

Submission


This Week - Submission

• Report• LaTeX TemplateProvided

• SimulinkA3Hand-In• GearboxAssemblyDrawing• Lookbackovertheexercise

4

2017


ReportWhy15pages?• Consistentmarking

• 1hourperreport.• 30minsreading.• 30minsmarking,feedback,assessingassemblydrawing&Simulinkmodel• 71groups->71hours->8.9daysofmarking

• Typicalreadingforcomprehension200wordsperminute->6,000words• 500wordsapageonaverage->12pages• Importanttobeclearandconciseinyourreport• Timescalesmatchindustryandthetimemanagerspermittoreviewreports

5

2017


The Reviewer

6

2017


• Yourboss• Arespectedengineer• Verybusy• Tight-timeconstraints• Clearconcisereporting• Wantstoknowthefeasibilityof

thisideaandisitworthpursuing?

Adrian Newey

https://s1.cdn.autoevolution.com/images/news/adrian-newey-receives-segrave-trophy-33526_1.jpg

ReportIntroduction(~1page)• Providesthecontextofthe

problemyou’retryingtosolve• Assumethatwe’reareviewerwho

hasnoideaoftheproject• Layoutthebusinesscase• Quantifywherepossible

• Workflowofthedesignprocessyouhaveundertaken

• Laysoutthestructureofthereport

7

2017

Introduction


ConceptDesign

DeploymentModelling


GearboxDesign

ConceptSelection

SolutionSpecification

Conclusion&FutureWork


Report

ProductDesignSpecification(~1.5/2pages)• Discussionofhowthespecificationwas

generated• Tableofspecifications

• Canbeupdatedsincethestage-gatesubmission

• Beasexhaustiveaspossible• 1pageissufficient

• Checkyourstage-gatefeedback• Referencematerialyouhaveusedtobuildit

8

2017

Introduction


ConceptDesign

DeploymentModelling


GearboxDesign

ConceptSelection




ReportConceptDesign(~2pages)• Threeconcepts• Descriptionofeachone• KeyFeatures• HandCalculations

• Estimateofmass• Areaenclosedbythemechanism• …?

• Presenteachoneinaconsistentmanner.NoBias.

9

2017

Introduction


ConceptDesign

DeploymentModelling


GearboxDesign

ConceptSelection




ReportConceptSelection(~1page)• Controlledconvergence

• UseyourPDSforthecomparisoncriteria!

• Finalconceptselection• Rationalebehindthefinaldecision

10

2017

Introduction


ConceptGeneration

DeploymentModelling


GearboxDesign

ConceptSelection




ReportDeploymentModelling(~3pages)• BoundaryCalculation

• Purpose• Free-bodydiagram• Assumptions• Results

• SimulinkModel• OverviewoftheModel– Whatdoessimulink

enableustodo?• SelectedSolver(WhyisRunge-Kutta asuitable

choice?)• Assumptions• Motor&GearboxModelDescription• MechanismModelDescription

11

2017

Introduction


ConceptGeneration

DeploymentModelling


GearboxDesign

ConceptSelection




ReportMotor,GearRatio&DampingSelection(~3pages)• Outlineyourcases

• Motorsinvestigated• GearRatios• LevelofDamping

• Tabledescribingthesecases.

12

2017

Introduction


ConceptGeneration

DeploymentModelling


GearboxDesign

ConceptSelection




CaseNo. Motor GearRatio Damping

1 … … …

2 … … …

ReportMotor,GearRatio&DampingSelection(~3pages)• Whatareyouinvestigating?

• Energyused• Smoothnessofmotion• Motorworkingwithinitsoperating

window• …?(Investigateamaximumofthree)

• Andhowwillyouinvestigatethem?• Whatarethecalculations?• Howwillyouusethemodelresults?• E.g.Areaunderthecurve

13

2017

Introduction


ConceptGeneration

DeploymentModelling


GearboxDesign

ConceptSelection




ReportMotor,GearRatio&DampingSelection(~3pages)

14

2017

Introduction


ConceptGeneration

DeploymentModelling


GearboxDesign

ConceptSelection




Time (s)

Motor Speed (rpm)

For example: Motor working within its operating window

• Plot Motor Speed or Torque over time with graph showing the ideal window of operation and the limits of operation

ReportMotor,GearRatio&DampingSelection(~3pages)• Showtheresults

• Graphsthathelpwithyourinvestigation• Also,wewouldlikeMechanismSpeedvsTime

andMotor TorquevsTimefromallofyou!• Tablehighlightingkeyvaluesforeachcaseso

youcancomparethem

15

2017

Introduction


ConceptGeneration

DeploymentModelling


GearboxDesign

ConceptSelection




CaseNo.

DeploymentTime

EnergyRequired

SmoothnessofMotion

1 … … …

2 … … …

ReportMotor,GearRatio&DampingSelection(~3pages)

• Discusstheresultsandrecordyourrationalebehindthefinalselectionofmotor,gearratioanddamping

16

2017

Introduction


ConceptGeneration

DeploymentModelling


GearboxDesign

ConceptSelection




ReportGearboxDesign(~3pages)• IntroduceGearboxDesignProcess• ProduceGearboxOptions• DiscussionandRationalebehind

FinalGearbox• Similarlayouttoprevioussection• Youropportunitytoshowusthat

youcanstructureasectioninthereport

17

2017

Introduction


ConceptGeneration

DeploymentModelling


GearboxDesign

ConceptSelection




ReportSolutionSpecification(~1page)• Thisshouldbeatableshowingthe

finalvaluesfromyouranalysisagainsttherequirementsinyourPDS

• ComparefinalfeasibledesignsolutionagainstPDS

18

2017

Introduction


ConceptGeneration

DeploymentModelling


GearboxDesign

ConceptSelection




ReportConclusion&FutureWork(~1page)• Summarisetheworkthathas

beenperformed• Highlightthekeyachievements&

resultsfromthework• Discussthenextstepsthatneed

tobetaken

19

2017

Introduction


ConceptGeneration

DeploymentModelling


GearboxDesign

ConceptSelection




General Report Writing• Allmajorsectionsshouldintroducethemselves• Allmajorsectionsshouldhaveasummary/concludingparagraph• FigureCaptions• TableCaptions• PageNumbers• Referencing• Graphs

• Axeslabels• Legends• Notitles(thecaptionisthetitle)• Makethemlegible!

• Tables• Minimiseuseofverticalseparators• Keepvaluestosames.f. ord.p.

20

2017


Level of Dependency

Figure 1: The design structure matrix for a formula student car

LaTeX Packages and Helpful Pages• Referencing\usepackage{natbib}

• https://www.sharelatex.com/learn/Bibliography_management_with_natbib• Use\bibliographystyle{plain}

• Tables• https://en.wikibooks.org/wiki/LaTeX/Tables

• FigureandTableCross-referencing\label{}&\ref{}• https://en.wikibooks.org/wiki/LaTeX/Labels_and_Cross-referencing

• Figures\usepackage{graphicx}• Savefiguresasepsorhigh-dpi(>300)pngs fromMatLab

• Subfigures\usepackage{subfig}• http://www.peteryu.ca/tutorials/publishing/latex_captions_old

• Wrapfigures\usepackage{wrapfig}• https://www.sharelatex.com/learn/Wrapping_text_around_figures

21

2017


MatLab• UsefulFunctions

• holdon– toenablemultiplelinestobeplotted• xlabel(‘’)- https://uk.mathworks.com/help/matlab/ref/xlabel.html• ylabel(‘’)- https://uk.mathworks.com/help/matlab/ref/ylabel.html• legend(‘’)- http://uk.mathworks.com/help/matlab/ref/legend.html• XandYTicks- https://uk.mathworks.com/help/matlab/creating_plots/change-tick-marks-

and-tick-labels-of-graph-1.html• Allhaveoptionstoalterfontsize,weightsandlinestyles• AndevenaddLaTeX mathssymbols-

https://uk.mathworks.com/help/matlab/creating_plots/text-with-mathematical-expressions-using-latex.html

22

2017


Questions?

23

2017


Simulink A3 Model

• Blocksclearlylabelled• Minimiseoverlappinglines• Mappedtomechanism• Getitreviewedbyyourpeersandinclass

24

2017


Simulink A3 Model (Example)

25

2017


a

bcd

ef

g

h i

1 2

3

46

7

8910

11 12

General Assembly of the Gearbox

• Page14ofyour1stYearDesignNotes

• Feedbackfromshaftdesignexercise• PartsList• GeneralDimensions• Clarity• SectionViews

26

2017


General Assembly of the Gearbox

• Page14ofyour1stYearDesignNotes

• Feedbackfromshaftdesignexercise• PartsList• GeneralDimensions• Clarity• SectionViews

• Showusinclass!27

2017


Feedback & Marks

28

2017


• Feedbackwillbereleasedaftertheexams• Focusontheexams• MarkswillbereleasedalongsidetheexamresultsonSAFE

Questions?

29

2017


Look how far you’ve come!• Familiarisedyourselfwitha

uncertain/unconstraineddesignproblem

• Marketresearch• Createdanumberofconcepts• FormedaPDS• Didsomeinitialcalculationsto

evaluateyourdesigns• Controlledconvergence• SystemsModelling• BoundaryCalculations• Assumptions

30

2017


• SimulinkModelling• Setoutanumberofcasesto

explorethedesignspace• Plottedresultsandselecteda

motor,gearratioanddamping• Evaluatedtwotypesofgearbox• Selectedafeasiblegearbox

design• Createdareportdetailingthe

process

Next Week

• FinalTutorialSession• Needtohand-inyourconstructionkits!• Willbecheckingthemin

• Lastchancetogetfeedbackonthesubmission• NoLecture• Submissiononblackboardandahardcopysubmittedtotheschooloffice

31

25 April 2017


Q & A

32

2017


Mechanism Feasibility Design Task · PDF file• Design of a multi-stage spur/helical gear...

Documents

Transcript of Mechanism Feasibility Design Task · PDF file• Design of a multi-stage spur/helical gear...