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PACE Emerging Market Vehicle Suspension Design

PACE Emerging Market Vehicle Suspension Design . University of Cincinnati . Undergraduate Students : Adam Quintana Elena Sabatini Michael Martin Nicholas Schira Graduate Assistant : Ronnie Mathew Faculty Advisor : Dr. Sam Anand .

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PACE Emerging Market Vehicle Suspension Design

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  1. PACE Emerging Market Vehicle Suspension Design University of Cincinnati

  2. Undergraduate Students: Adam Quintana Elena Sabatini Michael Martin Nicholas Schira Graduate Assistant: Ronnie Mathew Faculty Advisor: Dr. Sam Anand Suspension Team

  3. Front Suspension • McPherson Strut

  4. Dimensions of the Front Suspension Bottom View Side View

  5. Rear Suspension • Watts Linkage

  6. Dimensions of the Rear Suspension Front View Top View Side View

  7. Values of spring and damper constants • Front spring stiffness of 16 N/mm • Damping coefficient of 30 N-s/mm • Rear spring stiffness of 18.7 N/mm • Damping coefficient of 30 N-s/mm

  8. Suspension Incorporated in Frame

  9. Static FEM analysis – ANSYS Workbench Front suspension mesh Max Stress – Steering Force

  10. Static FEM analysis – ANSYS Workbench Rear suspension mesh Max Stress – Force from a bump

  11. Static FEM analysis – ANSYS Workbench • Loading condition • Braking Torque • Maximum steering force • Forces on suspensions while running over a bump • Results • Reduced angle and increased thickness steering arm on the knuckle . • Reduced thickness of the wishbone arms. • Shortened length of pivot arms of the rear suspension.

  12. Convergence Test • Multiple iterations were performed on the models while increasing the number of elements in the mesh. • Stresses were all converging – hence model is accurate.

  13. Dynamic analysis – MSC ADAMS • Input • Height of bump on the road • Velocity of the vehicle • Output • Spring and contact forces – values used for static analysis in ANSYS

  14. Simulation of the vehicle going over a bump on the road. Dynamic analysis – MSC ADAMS • Yaw, pitch and roll orientation used to determine the resonant frequency of the vehicle. • Fast Fourier Transform was performed to obtain the resonant frequency of the vehicle.

  15. Vertical displacement of the wheel • Forces ranging from 2500N to 5000N on the front and rear tires on the drivers side.

  16. Results Front Suspension • The maximum deflection of 8.22E-04 m was found during the steering simulation which was seen in the steering arm of the knuckle. • A strain of 2.75E-03 was determined to be the maximum strain in the bump simulation. • The highest stress came from the braking condition which was determined to be 4.48E+08 Pa. • Sufficiency of Model - maximum stress was not higher than the tensile strength of the material

  17. Results Rear suspension • Deflection of 5.63E-04 m was determined to be the maximum deformation in the bump simulation. • The highest strain came from the braking condition which was determined to be 3.02E-03. • The maximum stress of 6.03E+08 Pa was found during the braking simulation. Dynamic Analysis • The resonant frequency of the vehicle is 1.667 Hz. • Verifies stability of vehicle with values of spring stiffness and damping coefficient for both suspensions.

  18. Thank You !

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