04-28-2017 04:44 PM
I could use any help in building an Optmodel for cargo loading optimization on C-5 and C-17 aircraft. The following are constraints; the aircraft has longitidunial center of balance limits, axel weight limits for vehicles, overweight cargo in zones limits and pallets either too tall or to heavy in zones. If the aircraft's cargo is not within the limits than it is penalized with costs. I am trying to build the optmodel that calculates these for a set of shipping data onto multiple aircrafts and also is able to sort the shipment so that less penalties occur. Does anyone have experience building linear optimization models with binary variables?
04-28-2017 05:12 PM
Since you say C5 and C17 and those are military aircraft I have what may sound like an odd question. Is any of this load-out related to a tactical mission?
I ask because many years ago as an additional duty I was an Army unit movement officer and went through a short (week long) course on air load planning. One of the considerations was sometimes "what do you need first" when you get to the location as that affected order.
For instance if I have to load vehicles without cargo due to size/shape of the cargo, I might want the vehicle closer to the load ramp as a time sensitive bit would likely make it easier to move the cargo directly onto the waiting vehicle instead of move the cargo, then the truck then load on truck which could be the result of a pure optimal load weight/cube distribution optimization.
04-28-2017 08:20 PM
05-01-2017 11:17 AM
I mainly asked the question because others that do optimization might not realize that load time sometimes figures into these.
Do you have a good CB calculator of the individual vehicles? That was our biggest headache but the actual plane load plane was actually more of a paper and pencil exercise once we had vehicle loads as we would not be doing any palletized.
Though I do remember so of the solutions actually involved smaller vehicles or trailers actually the load ramps.
05-01-2017 03:29 PM
I am using SAS to calculate the CB. All I need are vehicle axle weights. The CB is going to be calculated for the whole aircraft with cargo on it. Do you know anyone who has experience with PROC OPTMODEL? There is a way to build constraints (the fees I described) so that SAS makes an optimal plan for loading the cargo.
05-01-2017 05:20 PM