1 ME 442 Senior Project Week 9 Dr. Joseph Vignola Pangborn G43, Phone 202-319-6132,...

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ME 442 Senior Project Week 9

Dr. Joseph VignolaPangborn G43, Phone 202-319-6132, [email protected]

Tuesdays & Thursdays, 9:40-12:20 AM, Pangborn G43

Office Hours: Tuesdays, 1:00-2:00 PM

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The Rest of the SemesterWelcome back from break

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The Rest of the SemesterEach team should plan to refine their plane and take it back to the DCRC airfield.

I would like each team to refine the design and construction

The most important thing to me is for you to redo anything that was done in hast or “because we didn’t have time”

All temporary work must me removed.

Your plane should match your drawings.

Mass and Mass center predicted in SolidWorks should match the predictions

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PurchasesI need to see the Excel budgets today and everyday

I want to be sure we are keeping careful track of all expenses.

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The Rest of the SemesterPresentations

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I will make a schedule and send it out

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I will make a schedule and send it out

I will try to do this by tomorrow.

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Things to PurchaseDC-RC club uses this model: Hitec X4 Plus AC/DC 4-Port RC Battery Charger for LiPo, LiFe, Li-Ion, NiCD, NiMH

Battery charger (We found this ! )Battery testerHeat gun, iron, and monocoatTools each team must have their own flight toolbox

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First PresentationsThe first set of Individuals presentations starting next week.

Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html

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First PresentationsThe first set of Individuals presentations starting next week.


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First PresentationsWe will have the first set of Individuals presentations starting next week.

Aim for 7 minutes of presentation and focus on design and how the design was translated into a prototype

You should have no less that 14 PowerPoint slides

There should be figures and all slides


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What to IncludeWe will have the first set of presentations the second week of class.

Talk about: How you made design decisions and show the fabricated result

List of design goals for the full plane and each subsystem

SAE wants you to should a design evolution


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What to IncludeWe will have the first set of presentations the second week of class.

Talk about: How you made design decisions and show the fabricated result

List of design goals for the full plane and each subsystem

SAE wants you to should a design evolution

Lots of SolidWorks drawings of your plane or subsystem


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What Not to IncludeNo need to discusssafety issuesHow you used your timeWhere you found or purchased items“because Don thought it would work” “because Don had one ” Common knowledge General theory


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Writing & Presentation Issues

I have posted my document on writing “Writing issues for engineers”.

I consider this a work in progress.

There is a “First Draft Check List” in the “Writing issues for engineers” document.

Please use after you finish your first draft is assembled for all documents to be turned in for this class.

There is a separate section of this documents for presentations


• Will the reader or recipient know what it is? Identify your document with a descriptive title and an introductory sentence.

• Your document must have your name, the date, the assignment, and a title.

• Get in the habit of using a premade title pages for MS Word and PowerPoint

• Use mine as a template if you like 17

Issue 1: Information Rich Title Pages


• Make sure that your reader can quickly find the section he or she is looking for.

• If you are covering more then one topic, each topic needs to have a titled section.

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Issue 2: Separate Different Topics


• Use logical sections and subsections

• Title each so that so that the content is obvious

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Issues 1&2 Corollary: Sections Titles

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Issue 2: Will the reader or recipient know what it is?

Identify your document with a descriptive title and an introductory sentence.

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Color and other embellishments

• Color, you can use color but your document but figures should work in B&W if possible.

• Hyperlinks, you should use them but the web address must appear in a footnote or the reference section.

• Animations, movies and sound files can be helpful but can also be trouble. Be aware that some of your readers will not be able to access them.

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I have posted my document on writing “Writing issues for engineers”.

There is a “First Draft Check List” in the “Writing issues for engineers” document.

Please use after you finish your first draft is assembled for all documents to be turned in for this class.

There is a separate section of this documents for presentations

Information Rich Title Page• Will the reader or recipient know what it is? Identify

your document with a descriptive title and an introductory sentence.

• Your document must have your name, the date, the assignment, and a title.

• Get in the habit of using a premade title pages for MS Word and PowerPoint

• Use mine as a template if you like

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Separate Different Topics

• Make sure that your reader can quickly find the section he or she is looking for.

• If you are covering more then one topic, each topic needs to have a titled section.

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Section Titles



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Section Titles



“Introduction” is not a good subsection title for the introduction

“Analysis” is not a good subsection title of the analysis section

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Color and other embellishments

• Color, you can use color but your document but figures should work in B&W if possible.

• Hyperlinks, you should use them but the web address must appear in a footnote or the reference section.

• Animations, movies and sound files can be helpful but can also be trouble. Be aware that some of your readers will not be able to access them.

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Refine DocumentationEach member of the group should be sure that you bring ALL electronic files everydaySolidWorks drawings

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DocumentationEach member of the group should be sure that you bring all electronic files everydaySolidWorks drawingsExcel budget and receipts


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DocumentationEach member of the group should be sure that you bring all electronic files everydaySolidWorks drawingsExcel budget, must be this version or have this information


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DocumentationEach member of the group should be sure that you bring all electronic files everydaySolidWorks drawingsExcel budget, must be this version or have this information

Item(s)Date of purchaseSupplierDate receivedTotal cost (items + shipping and anything else)Who’s credit was used Name of the receipt pdf file

One line per transaction


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DocumentationPlease bring all your electronic files everyday

SolidWorks drawingsExcel budget


It’s best to use the document that I started

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DocumentationPlease bring all your electronic files everyday

SolidWorks drawingsExcel budget


It’s best to use the document that I startedIt’s on the class web page

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Design Support Documents


1) Gantt chart A timeline with milestones, component delivery dates, estimated dates of the

completions of sub-tasks. This can be a separate Excel document.

2) Weight and drag budget A document that lists target, design and as-build weight and location for all components

on the plane. Specifically state what are estimates and what was calculated in SolidWorks and what was measured as-built. Include the coordinates of the CGs for all subsystem. The coordinates must be in a defined, single coordinate system and include a figure that shows the plane, coordinate system and centers. This should be in the main MS Word document.

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3) Cost budget & parts inventoryA list of all component parts you will include in your plane. You should have links to data sheets. The budget should include all planed expenditures and all money spent by your group related to the project. This is can be a summary of a separate Excel spread sheet. You must save all receipts.

4) Toolbox inventoryA specific list of all tools, bolts and any other hardware with sized. Do not include this in the Excel document. This should be in the main MS Word document.

5) Safety protocolsRead the new School of Engineering Safety document and write a statement that indicates that you have read and will comply with all points of the School of Engineering Safety. This document must be signed by all team members.

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3) Cost budget & parts inventoryA list of all component parts you will include in your plane. You should have links to data sheets. The budget should include all planed expenditures and all money spent by your group related to the project. This is can be a summary of a separate Excel spread sheet. You must save all receipts.

4) Toolbox inventoryA specific list of all tools, bolts and any other hardware with sized. Do not include this in the Excel document. This should be in the main MS Word document.

5) Safety protocolsRead the new School of Engineering Safety document and write a statement that indicates that you have read and will comply with all points of the School of Engineering Safety. This document must be signed by all team members.

Plus send Ken your SolidWorks

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Group Purchases


We need to purchase:

chargerCharge level indicator

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SAE Reports


Please don’t resubmit last semesters reports

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Materials and PurchasingIt is very import that we straighten the budget today


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MaterialsI can cut materials for you to any dimension, exactly to the dimensions you give me.

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ExpediencyBe sure you are making design decisions based on engineering principles.

Please don’t


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MaterialsAsk Ken to bring specific material you need


Ken

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Materials and PurchasingIt is very import that we straighten the budget today There are problems with the credit card

MNEY

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Materials and PurchasingIt is very import that we straighten the budget today There are problems with the credit card

The card problems include the lost receipts from this class

MNEY

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Materials and Purchasinge-mail Hong right away to schedule time

She is nicer that I am and will help you

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Flight Testing

Jim and Ed want to test Tuesday, Feb 25


That’s 7 days off

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Flight TestingI’m hoping that Ken will schedule and do the technical inspection and taxi tests with you


…and you have to do the taxi test and technical inspection before the flight test

S M T W Th F S

6 7 8

9 10 11 12 13 14 15

16 17 18 Today 19 20 21 22

23 24 25 Flight Test

26 27 28SAE Deadline

May 1

I’m still working on this but the big issues is

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Machine ShopPlease work with Don, Hong or anyone that has built things

Show them sketches of ideas and be open to new ideas

This will make it easier for you


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Machine ShopPlease work with Don, Hong or anyone that has built things

Show them sketches of ideas and be open to new ideas Simplify your design

Settle on the details


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Assignment 2Fix assignment 1

A number of groups did not submit assignment 2 or didn’t really update anything


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Toolbox Please just list what you need to carry to the airfield.

Glue that take overnight to dry is probably not appropriate for that list but cyanoacrylate glue (Superglue) is

You should know what each screw is for


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You should know what each screw is forPlease don’t list random items


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You should know what each screw is forPlease don’t list random items ¼” screws


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You should know what each screw is forPlease don’t list random items ¼” screws, a hammer


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You should know what each screw is forPlease don’t list random items ¼” screws, a hammer, weed wacker


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You should know what each screw is forPlease don’t list random items ¼” screws, a hammer, weed wacker


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Ask Jason, Hong, Ken or me what you really need


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Money

Lets start with the group that has the most people here


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Money

Thanks for the help resolving the credit card issues


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Flight Testing

Jim and Ed want to test Monday, Feb 24


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Flight Testing



S M T W Th F S

6 Today 7 8

9 10 11 12 13 14 15

16 17 18 19 20 21 22

23 24 Flight Test

25 26 27 28 29


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Flight Testing



…and you have to do the taxi test and technical inspection before the flight test


S M T W Th F S

6 Today 7 8

9 10 11 12 13 14 15

16 17 18 tech insp taxi test

19 20 21 22

23 24 25 Flight Test

26 27 28 1

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So Given the Calendar

Work with Ken, Hong, Don, and Me


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Flight Test

I would like you to make all the arrangements regarding getting up to the airfield Tuesday.


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Money

Thanks for the help resolving the credit card issues

Today we can start with group ?


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Myths and TruthsMyths Gorilla Glue is no stronger than ordinary carpenters glue


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Myths and TruthsMyths Gorilla Glue is no stronger than ordinary carpenters glue You can make a part bigger then the travel range of the CNC machine


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Ken brought enough wood for everyone


Ken

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Ken brought enough wood for everyone

Purchase always come through as hoped


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Myths and TruthsTruthsRound holes are easier to make then not round holes


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Myths and TruthsTruthsRound holes are easier to make then not round holes

Hong needs some sleep


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You need to know where the CG isWeighted averages.

x

y

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Mass and Aerodynamic Centers Weighted averages.

x

y

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Mass and Aerodynamic Centers Weighted averages. Pick an origin

x

y

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Mass and Aerodynamic Centers Weighted averages. Pick an origin, make a table

x

y

component Mass (kg) x-location (cm)

engine 0.45 -3

fuselage 2.1 75

Wing 2.3 27

Front landing gear 0.35 12

Rear landing gear 0.64 34

Fuel tank 0.33 8

Radio reciever 0.25 7

tail 0.75 150

Payload

Total 7.17 319

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Mass and Aerodynamic Centers Weighted averages. Pick an origin, make a table

x

y

component Mass (kg) x-location (cm)

engine 0.45 -3

fuselage 2.1 75

Wing 2.3 27

Front landing gear 0.35 12

Rear landing gear 0.64 34

Fuel tank 0.33 8

Radio reciever 0.25 7

tail 0.75 150

Payload

Total 7.17 319

51.2 cm

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Mass and Aerodynamic Centers Each component that is exposed to the exterior flowHas a net drag force that acts on that component

The magnitude of that force is

51.2 cm

These drag forces occur at specific locations

These location must be determined

Once you have them

x

z

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Mass and Aerodynamic Centers Each component that is exposed to the exterior flowHas a net drag force that acts on that component

The magnitude of that force is x

z

51.2 cm

These drag forces occur at specific locations

These location must be determined

Once you have them

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Mass and Aerodynamic Centers

x

z

51.2 cm

Once you have them…

DRAW A FREE BODY DIAGRAM

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Mass and Aerodynamic Centers Once you have them Then sum forces andmoments

mg

thrust

Wing drag

tail drag

fuselage drag

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mg

thrust

Wing drag

tail drag

fuselage dragx

z

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mg

thrust

Wing drag

tail drag

fuselage dragx

z

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mg

thrust

Wing drag

tail drag

fuselage dragx

z

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mg

thrust

Wing drag

tail drag

fuselage dragx

z

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Mass and Aerodynamic Centers This summing for moments is precisely the same as the weighted average

x

z

51.2 cm

component Net drag (N) z-location (cm)

x-location (cm

fuselage 2.7 5 44

Wing 15.3 17 45

Front landing gear

3.5 -12 34

Rear landing gear

5.8 -11 76

tail 13.7 21 125

Total 40.7

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You MUST include this informationThis summing for moments is precisely the same as the weighted average

x

z

51.2 cm

component Net drag (N) z-location (cm)

x-location (cm

fuselage 2.7 5 44

Wing 15.3 17 45

Front landing gear

3.5 -12 34

Rear landing gear

5.8 -11 76

tail 13.7 21 125

Total 40.7

So have a figure with YOUR plane, a coordinate system, and the location of the centers

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Design to Meet ObjectivesThe objectives are requirements and constraints

Requirements and constraints are separate

Requirements: what you are expecting from the full system or subsystem

Constraints: what you are stuck with

They must be specific

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Landing gear must be strong enough

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Landing gear must be strong enough

Must remain elastic for 3 f/s vertical fall will transferring less that a 2 g impulse to the fuselage

Requirements and ConstraintsThere MUST be requirements and constraints for the plane itself Every subsystem MUST have bulletined requirements and constraints listed separately

The should have numbers and be specific

Fuselage RequirementsHold: 4 cell battery (based on 6 minute flight)z57 model radio receiver (with link to data sheet)27 lbs payload at plane’s unloaded CG and wing’s CLRemovable wing mount able to transfer 42 lbs from wing to fuselage. Engine mount within ± ½ in of current estimate of plane’s aerodynamic centerTransfer 2 x planes full weight (84 lbs) to landing gear…

Support 2.5 lb horizontal force generated by tail with rudder at full deployment…

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ME 442 Senior Project Week 3

Dr. Joseph VignolaPangborn G43, Phone 202-319-6132, [email protected]

Tuesdays & Thursdays, 9:35-12:25 AM, Pangborn G43

Office Hours: Tuesdays, 1:00-2:00 PM

Week 3

Build

Week 3

Please email your t-shirt size to Ms. Hicks and Nicole Bull

[email protected]

Today I would like to see Excel budgets

1 ME 442 Senior Project Week 9 Dr. Joseph Vignola Pangborn G43, Phone 202-319-6132,...

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