robert golmon advisor: dr. lee instructor: cris koutsougeras et 494 - senior design fall 2012
TRANSCRIPT
SAE BAJA PROJECT FRAME DESIGN
Robert GolmonAdvisor: Dr. LeeInstructor: Cris KoutsougerasEt 494 - Senior Design Fall 2012
IntroductionThe Baja SAE project is a competition that simulates real-world
engineering design projects and their related challenges. Engineering students are given the task to design and build an off-road vehicle that will survive the severe punishment of rough terrain.
ObjectivesThe objective of my part of the baja project is
to design and construct the chassis/frame of the vehicle from the ground up. Some challenges to are I need to keep the frame both light and strong while I try to keep the cost down. I will need to calculate the proper frame diameter and test the whole design by doing a stress analysis.
• To draw my frame I decided to use Inventor professional 2011.• Similar to auto cad but also has a FEM(finite element method) software built
INVENTOR 2011
Fall 2012 • Add to my design by adding suspension mounts and other suspension components, using approved steering design.• Run stress analysis with FEM software on the new frame assembly. • After the design is approve I will need to build the frame
Rear Suspension DesignFour link suspension uses links to prevent the axle from
moving side to side or back or forth while allowing it to go up and down as well as articulate. A well designed and tested four link will provide a superior translation to the ground and higher ride quality.
Four Link Design
Frame Analysis
• For the analysis the weight of the driver an the weight of the engine were added where they connect to the frame.• I ran the analysis on different tubing sizes ranging from 1x.133- 1.25x .065 to find the smallest diameter pipe that would satisfy the max stress for the design factor .
Design Factor
Results
The tubing that satisfied the conditions and gave use the most weigh advantage was the 1.25x.065
Sy/8.7= 30043.54/8.7= 3453.28 psi
Name Minimum Maximum
Displacement
Displacement 0.000 in 0.014 in
Forces
Fx-167.671 lbforce
167.330 lbforce
Fy-25.769 lbforce
26.240 lbforce
Fz-72.074 lbforce
210.373 lbforce
Mx-163.865 lbforce in
169.013 lbforce in
My-690.276 lbforce in
214.525 lbforce in
Mz-56.091 lbforce in
56.071 lbforce in
Normal Stresses
Smax -78.571 psi 2983.580 psi
Smin -2759.543 psi 723.430 psi
Smax(Mx) 0.000 psi 1869.558 psi
Smin(Mx) -1869.558 psi -0.000 psi
Smax(My) 0.000 psi 2372.986 psi
Smin(My) -2372.986 psi -0.000 psi
Saxial -247.848 psi 723.430 psi
Final Frame Design
• Material = 1020 Dom 1.25x.065
tubing
• Weight = 78.7 lbs using 96 ft of
tubing
• Cost=$186.24
Timeline
September 12- Proposal
October 1- have the altered design in cad
October 27- have the stress analysis for the new design
December 1 – Constructed frame