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1970 Lotus Europa Front Suspension Redesign

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1970 Lotus Europa Front Suspension Redesign

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    2. Project Background 1970 Lotus Europa 1470cc, 4-cylinder engine producing 78 hp 120 mph top speed 13-inch wheels 2-piece control arms Stamped & welded Bolt-on ball joints Coil-over shock & spring arrangement

    3. Customer Requirements Maintain suspension geometry Provide stable 200 mph ride Maintain 5 inch ride height Utilize 15 inch Audi wheels Utilize current frame mounting points Maintain wheel-to-wheel dimension Attempt to utilize stock shock and spring size Minimal bodywork modifications

    4. Engineering Targets

    5. Final Design

    6. Final Design Upper Arm = 5.60 in Lower Arm = 11.03 in Scrub = 10 mm Steering Axis = 16.5º Rotor Clearance = 0.69 in

    7. Design Animation

    8. Design Animation

    9. Design Evaluation Suspension Analysis Four-bar Mechanism

    10. Design Evaluation “Fourbar” Program – Norton Evaluate each control arm length iteration Rough wheel motion “Four-bar Mechanism” - Matlab Quantitative wheel motion ProEngineer Mechanism output to Excel “Camber Curve” - Matlab Camber curve comparison

    11. Design Evaluation Iteration Method 2 Iteration Sets First Set – 11 possibilities Manipulated Variables Scrub radius Steering axis Second Set – 6 possibilities Same Variables Smaller scrub radii Larger steering axes

    12. Design Evaluation Case 5: Steering Axis – 16.5° Scrub radius – 10.0 mm Upper arm – 5.60 in Lower arm – 11.03 in Case 1: Steering Axis – 16.0° Scrub radius – 11.0 mm Upper arm – 5.70 in Lower arm – 11.04 in

    13. Design Evaluation

    14. Design Evaluation

    15. FEA Results

    16. Final Evaluation

    17. Conclusion & Recommendations Conclusion Kinematic motion requirements met Verified some physical packaging requirements Recommendations Further finalization of arm shapes In-depth finite element analysis Close examination of control arms and knuckle attachment One team for knuckle/brake and suspension design

    18. Questions?

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