ABSTRACT
Compact robotic automated parking system is a new system with higher storage utilization. The existing retrieve process causes the time of the car waiting for the lift to be longer than the time of the lift moving to the target floor from the first floor. The system always chooses the lift that is closest to the car, which may increase the expected retrieve time. Firstly, we made a new retrieve process to improve by sending commands simultaneously to the car storage floor and the lift, allowing the lift rising before the car completes the movement on the target floor. Secondly, two strategies for selecting the lift, the shortest distance strategy, and the shortest time strategy, are equipped with the process improved, which is used to compare with the process not being improved. Meanwhile, the system configuration design is discussed. Finally, simulation results show that the process improved using the shortest time strategy reduces the average retrieve time by 20%-50% compared with the process not being improved. Under the experimental conditions, the maximum space utilization rate of the system was 60.5%. Furthermore, considering to retrieve time and space utilization rate, the circular fixed platform radius is 5.85 meters, the system radius is 17.85 meters, the number of floors is 14, and the number of lifts is 6. The experimental results show that the process improved with the shortest distance strategy is better, and the system configuration design is feasible.
