1. Solar Car Strategy An evolutionary algorithm using the Strength Pareto approach Srinivas ‘jack’ Jakkidi

2. Overview Solar car basics Solar car basics Problem statement Problem statement Strength Pareto Strength Pareto Algorithm Algorithm Results Results The road ahead The road ahead

3. Solar Car basics Solar array Solar array Batteries Batteries Aerodynamics Aerodynamics Rolling resistance Rolling resistance Efficiency losses Efficiency losses Resource starvation Resource starvation

4. Problem Statement How fast to go through the day? How fast to go through the day? Maximize distanceMaximize distance Minimize battery usageMinimize battery usage Use X% of the batteryUse X% of the battery

5. Strengths Pareto Multiple Criterion Multiple Criterion Distance, battery usageDistance, battery usage Pareto element: no individual travels farther AND uses less energy. Pareto element: no individual travels farther AND uses less energy. Pareto front: set of all Pareto elements. Pareto front: set of all Pareto elements. Fitness: depends on the number of elements that the element ‘dominates’. Fitness: depends on the number of elements that the element ‘dominates’.

6. EA Basic EA structure Basic EA structure Fitness using Pareto technique Fitness using Pareto technique Targeting: Scaling the fitness based on its distance from a target Targeting: Scaling the fitness based on its distance from a target Target = end battery desired

7. Results: w/o targeting

11. Results: w/ targeting

13. Summary Strength Pareto algorithm works well Strength Pareto algorithm works well Optimizes to less than 1% error Optimizes to less than 1% error Problems Problems Targeting Vs. Lowering Battery usageTargeting Vs. Lowering Battery usage Computationally intensiveComputationally intensive

14. The road ahead Weather, terrain, etc. Weather, terrain, etc. Solar car model Solar car model American Solar Challenge American Solar Challenge

15. got sun ?