Multi-activity Resource: Var. Cont. Consumption and Var. Duration?

Question

Hi everybody,
I need to model the situation below:
The machine A is capable to process 10 m3 of the product P at once. A processing lasts 30 min regardless of the load of the machine.
For example, an order for 35 m3 of the product is to be executed. So, the machine is started 4 times (4th load is 5 m3) and processing time equals to 2 hours (30 min * 4).
If there is another order, for example, an order for 5 m3, then the two orders should be combined, that is, the 4th load must be full (residual 5 m3 of the order 1 + 5 m3 of the order 2).
I can't figure out a proper way to define consumption values in PPM. It's not possible to define both, duration and cont. consumption, as variable values.
Has someone any ideas?
Best regards,
Mikalai

Answer 1

Hello ,
To model the scenario you mentioned ,i would suggest following
1.Go with 'Fixed time-cont consumption ' of resource and 'variable duration' of the activity.
2.With Fixed cont-consumption the order will consume the resource capacity of ,only the resource on which it gets scheduled. And with
Variable duration the orders will be generated according to ppm settings(eg.1st order with duraion 105 mins and 2nd with duration 15mins)
3.Use std PPDS hueristics to generate orders(for eg. MRP hueristics), so that it will generate orders of qty 35m3 and 5m3 .
4.Use DS hueristics for scheduling so that the two diferent orders are combined to form equal load on the resources.
Thanks & Regards
Abhijit