How to reduce unused vehicle capacity

[deadpassive]

Hi,

We are running an optimisation to reduce the number of vehicles required to carry out shipments. In our case a shipment is the movement of a person. We have a number of vehicle types each with a number of seats which acts as the vehicle’s capacity. However, the output of the optimisation often uses the wrong vehicle type - e.g. it will use a 10-seater vehicle to transport only 2 people).

Is there any way to penalise under-capacity vehicles to prevent this?

Thanks

[jie31best]

related:

@braktar

define a fix cost (setFixedCost) on the vehicles types, proportionnal to its capacities

It will define a preference on the smaller vehicles for the same routes.

Better vehicle utilisation in jsprit

Suppose I have two vehicles with capacity 5 and 12 respectively, and there are 4 shipments to be picked up. On solving this problem jsprit usually assigns the 12 capacity vehicle to pickup/deliver the 4 shipments. To workaround this problem, I modified the objective function using vraBuilder.setObjectiveFunction(new SolutionCostCalculator() and set a cost associated with under utilisation of vehicles. Is there a better way to solve this? Thank you for your response.