where R=hourly delivery rate per vehicle
t = delivery cycle time computed by
at = the available time in 1 hr witch adjustment for time loss
the total number of vehicles ( trucks , AGVs , trolleys , carts ,etc. ) needed to satisfy a specified total delivery schedule R in the system can be estimated by first
calculating the total workload required and then dividing by the avaible time per vehicles .
workload is defined as the total amount of work , expressed in terms of time , that must be accomplished by the material transport system in hr.
This can be expressed as follows.