# Fmea

Satisfactory Essays
Alternative Fuel Group

Steering Decision Presentation
By: Dan Groll Alt. Fuel Group Suspension/Braking Sub-Group

Alt Fuel Group, SrDesign, 1

Alternative Fuel Group

Overview
• Decision • Functional Design • FMEA • Calculations • Manufacture
Alt Fuel Group, SrDesign, 2

Alternative Fuel Group Pitman Arm Vs Rack and Pinion Steering System
Pitman Arm •Higher turning ratio Rack and Pinion •Requires 3-4 complete revolutions from lock to lock •Possible Slippage •System of Gears

•Less Sensitive to Errors in assembly •Less complex parts

•Ease of machining

•Need to be ordered or specially designed

Alt Fuel Group, SrDesign, 3

Alternative Fuel Group

Pittman Arm Steering System

Alt Fuel Group, SrDesign, 4

Alternative Fuel Group

FMEA
Failure Modes
RPN= (SEV)*(OCC)*(DET) Mounting Issues 24 = (3) * (4) * (2)

Weld Fracture Removal of lubricant Loose Fittings Peg Failure

160 6 30 30

= (8) * (2) * (10) = (3) * (2) * (1) = (3) * (5) * (2) = (3) * (2) * (5)

Alt Fuel Group, SrDesign, 5

Alternative Fuel Group

FMEA
Weld Fracture (RPN=160)
RPN= (SEV)*(OCC)*(DET) SEV = 8 Significant danger depending on circumstances May work but almost useless

OCC= 2

Very small chance of occurrence Forces in steering system are not very significant

DET=10

No chance to detect and avoid

One possible solution is to add set screws

Alt Fuel Group, SrDesign, 6

Alternative Fuel Group

Approximating the Steering Column Length
The Steering column length should be approximately 31 inches long

Alt Fuel Group, SrDesign, 7

Alternative Fuel Group

Calculating Wheel Angle θ The minimum requirement for turning radius is 10 ft

90o-θ
Wheel base

In order to prevent under steer this will be used for the maximum turning radius

θ

To calculate the corresponding wheel angle:
Law of Sines

r Wheelbase = sin(90) sin(θ )

θ req = sin −1 ⎜

⎛ 4.625 ft ⎞ ⎛ Wheelbase ⎞ ⎟ = 27 o = sin −1 ⎜ ⎟

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