Possibly newbie questions about triggers

All topics on the Atoms in any Enterprise Dynamics Library.
Post Reply
The_Dingo
Posts: 2
Joined: Wednesday 05 December, 2012 - 07:03

Possibly newbie questions about triggers

Post by The_Dingo »

Hi there,

I am trying to fix a simple small assignment but for some reason the triggers are trigging me ;)

The case deals with a supermarket, where customers arrive in a pattern that is best described with a
negative exponential distribution in 15 seconds. A distinction is made between 4 types of customers arriving from
the following breakdown:

Customer type Probability
1 10%
2 15%
3 45%

Customers have a residence in the supermarket that can be described in relation to the type of customer, where the following conditions are applicable:

Customer Type Retention
1 Negative exponential distribution at 10 min.
2 The normal distribution with a mean of 8 minutes. and a standard deviation of 2 min.
3 Negative exponential distribution of 4 minutes.

The supermarket has 6 box lines at the end, where response times can be related to the type of customer.
Processing time can be described by the following:

Customer Type Turnaround
1 is normally distributed with a mean of 2 min. and a spread of 155 seconds.
2 is normally distributed with a mean of 2 min. and a standard deviation of 100 seconds.
3 Negative exponential distribution with 110 sec.

Is it possible to make a simulation of the system, where each box services its own queue, and opens a new box when
More than 6 in line at the previous box. The customers of the queue is the lesser?
SimonvdW
Posts: 47
Joined: Thursday 06 January, 2011 - 09:52

Re: Possibly newbie questions about triggers

Post by SimonvdW »

Hi,

Attached an (example) model to show you how it works.
To assign customer types I use an Emperical Distribution. The resulting value is used in determining the process times in the shop and at the boxes.

Initially only one out of six lanes is opened.
The queues in front of the boxes haves some code on it that orders the next queue (connected through the second output channel) to open as soon as more than 6 customers are waiting in it. This continues until all 6 are opened.

You can use a similar construction to close the input of the lanes when no (or only a few) customers are in. In that case: use the Trigger On Exit.

Bij the way: the suggested parameter settings will lead to a situation with 6 opened boxes that still does not meet the required capacity. The input is 4 customers per minute on average. The box capacity is 6 * 0.5 customer /minute = 3 customers /min.
Attachments
SuperMarket.mod
The example model
(40.68 KiB) Downloaded 348 times
Post Reply