Team short bus that s how we roll 3 8 2006
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Team Short Bus “That’s how we roll.” 3/8/2006 PowerPoint PPT Presentation


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Team Short Bus “That’s how we roll.” 3/8/2006. Team Members: Michael Harrison…………………Team leader Caleb Monk……………………Media Manager Will Moore…………………………..Webmaster James Nishimuta……Shop/Machine Manager Clint Perry…………………CAD/FEA Engineer Alex Podust…………….Engineering Manager. Last Week:.

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Team Short Bus “That’s how we roll.” 3/8/2006

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Team short bus that s how we roll 3 8 2006

Team Short Bus“That’s how we roll.”3/8/2006

Team Members:

Michael Harrison…………………Team leader

Caleb Monk……………………Media Manager

Will Moore…………………………..Webmaster

James Nishimuta……Shop/Machine Manager Clint Perry…………………CAD/FEA Engineer

Alex Podust…………….Engineering Manager


Last week

Last Week:

  • Midterm Presentation Review

  • Design Layout


This week

This Week

  • Design Layout

  • Engineering Analysis

    • Areas prone to failure

    • Potential engineering/manufacturing problems

    • Estimate basic features (weight/size)

    • Should also address material analysis for fasteners, stability during operation, human interface, safety, tolerance, material selection


Design layout

Design Layout


Areas prone to failure

Areas Prone to Failure

  • Support member and teeth

  • Release mechanism

  • Support Flange


Potential engineering manufacturing problems

Potential Engineering/Manufacturing Problems

  • Latch complexity

  • Handle/cable interface size/location/method of attachment


Engineering estimations

Engineering Estimations

  • Jack Flange

  • Support Member

  • Support Member Teeth

  • Latch

  • Disengagement

  • Release mechanism


Jack flange

Jack Flange

  • Safety Factor: 3

  • Material: 1045 cold rolled steel

  • Load:15569 N (3500 lbs)

  • Load condition: Bending

  • Length:0.1 m

  • Width:0.1 m

  • Thickness:0.025 m


Support member s f 3 9

Support Member (S.F. = 3.9)

  • Rectangular cross section

  • Load:15569 N (3500 lbs)

  • Load condition: Compression

  • Length:0.3048 m (12 in.)

  • Width:0.0381 m (1.5 in.)

  • Height:0.0254 m (1 in.)

  • Max load due to angle: 89658 N

  • No buckling anticipated by l/h ratio


Support member teeth s f 12 7

Support Member Teeth (S.F. = 12.7)

  • Material: 1045 cold rolled steel

  • Load:15569 N (3500 lbs)

  • Load Condition: Bending and Shear

  • Depth:0.00635 m (0.25 in.)

  • Width:0.0254 m (1 in.)

  • Height:0.0254 m (1 in.)

  • Tensile Yield Strength: 530 MPa

  • Shear Yield Strength: 306 MPa

  • Actual Shear stress: 24.1 MPa


Latch s f 3

Latch (S.F. = 3)

  • Model: rectangle beam, 2 force member

  • Material: 1010 Steel Cold Drawn

  • Load:15569 N (3500 lbs)

  • Load Condition:Bending

  • Arm Length:0.05 m

  • Latch Rotation: 30 degrees

  • Min A_cs:1.53E-04 m^2

  • Min pin A_cs:1.71E-04 m^2


Disengagement

Disengagement

  • Material: Steel Bicycle Cable

  • Yield Stress: 140 GPa

  • Handle displacement: 0.0127 m (0.5 in)

  • Torque spring:22.24 N (5 lbs)

  • X2_max: 0.01905 m (0.75 in.)

  • Support Member Weight:17.79 N (4 lbs)

  • Disengagement force: 14.27 N (3.208 lbs)


Release mechanism s f 3

Release Mechanism (S.F. = 3)

  • Four Handle pins

    • Force on Pin: 800 N (180 lbs)

    • Length: 0.0254 m (1 in.)

    • Diameter: 0.0064 m (0.25 in.)

  • Pin constraint

    • Pin diameter must be less than a third of the diameter of the handle, so must be less than 0.5 in.

    • Constraint OK


Release mechanism cont d

Release Mechanism (cont’d)

  • PVC Pipe

    • Inner Diameter:0.0381 m (1.5 in.)

    • Outer Diameter:0.0445 m (1.75 in.)

    • Length of Tube:0.9144 m (36 in.)

    • Force on Tube:108045 Pa (15.7 psi)

    • Compressive strength: 9600 psi (7800 lb)*

    • Weight:.528 kg (1.16 lb)

      *specific to given geometry


Next week

Next Week:

  • Complete set of part drawings for actual design

    • Description of part drawings ready for manufacture

    • Subassembly layout drawings ready for manufacture


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