SAE 1: Four Wheel Steering Progress Report Clyde Baker Ken Brown Alex Cherukara Kevin Eady

Project Overview Reduce turning radius to 7 feet from 14 feet Use 4-wheel steering system Considerations: –Driver performance and comfort –Must not interfere with other components –Proper stability of car during competition –Rugged design to endure off-road course –Budget less than $500

Sponsor Meetings Met with Dr. Hollis for assistance in calculating forces exerted on steering components Advised team to use gearing to reduce rear rack travel rather than adjusting the geometry to achieve the desired rear wheel angles

Recent Achievements Completed force analysis on front steering system –Highest stress at 30 degrees –Deceleration from 30 mph to 0 mph in 0.7 seconds –Factor of safety of 2 –Greatest stress on ½ inch tie rod end is approximately 1000 MPA

Recent Achievements Front Steering System

Recent Achievements Completed force analysis Redesign of rear system

Recent Achievements Design of rear system using geometry to achieve desired wheel angles Design abandoned due to odd steering arm lengths and rack vulnerability

Recent Achievements Designed Steering Gear Box Rear to front steering gear ratio is 1:2

Current Work Current work includes: –Modeling system in Pro-E and Pro- Mechanica –Calculating maximum forces exerted on steering system

Future Work Future work includes : –Analysis in Adams –Material selection for components based on force analysis –Locating/pricing possible components.