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About CGGericke


    Graduate student in Mechanical Engineering (M. Sc.)

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  1. Hi I have a situation where we receive applications only during week days. I have a source with a Rate Table but this only allows me to add the rate per day. The end result is that I am receiving the same number of applications over weekends as what I am receiving during the week. This results in servers being overloaded and queues building up. I would like to have the entities arrive during the 5 days of the week and not over Saturdays and Sundays. I would appreciate your help, although I suppose the answer is very simple. I have not used Simio for a few years and I am trying to get back into it. CG
  2. MEagar, My e-mail is 15992012@sun.ac.za - if you could send me that process logic it would be great! Thanks for all your trouble! ASagan, Thanks for attaching the model I'm going to look at it now. Thank you for all your trouble as well! Regards Carl-Gustaf
  3. Any help would be appreciated tremendously! Sorry I'm only coming back to you now. Thanks!
  4. Hi all, I have been struggling with this problem for a while now. I have vehicles that pick up water from a tank and then take it to a number of smaller tanks. I looked at a simbit (“Pick up and drop off flow”) where entities are used to transport flow between containers. Now I have tried to do this by creating a new transport class but I couldn’t get it working. I need vehicles to do this (and not entities) because they have to travel to drop off the flow at a certain station and then they have to park and wait until they have to travel again. So I’m probably going to assign some sort of route logic to the vehicles. I don’t know if there is a way in which you could manipulate an entity’s process logic to do exactly that. Any help will be appreciated. I attached a basic model if someone is willing to play around with it. Thanks allot! Regards Carl-Gustaf FlowTransport.spfx
  5. Hi all, I need help and guidance. I started with this dust suppression model and the file that I attached is what I came up with. I am going to make the dusty paths a sub-model but first I want to figure out all of the logic on a smaller scale. Now currently I have three paths that get watered. The water capacity/need of the path is represented by the three tanks and sinks next to them. Tank 1 is the filling station and it can be assumed that there will always be water. So the three paths represented three different levels of traffic. A higher traffic path has a faster flow rate towards the sink therefore it will need more frequent watering. What I need now is to define lets say 14 water trucks that I can separately monitor, that wont get destroyed at the end of their run and that park at a parking station until they are needed again. I also want to attach a certain failure logic to each of the trucks. I have tried using vehicles but I'm struggling to get the process logic working. I'm am still quite new to simio so I might be missing things. I'll appreciate any inputs. Thank you very mutch Carl-Gustaf Dust.spfx
  6. Thank you for the reply! I will let you know once I get it up and running. All the best! Regards Carl-Gustaf
  7. This is my first time using this forum so I hope I am posting this in the correct section. I am currently busy with a problem involving the dust suppression program at an open pit mine. In open pit mines water trucks are used to maintain the condition of haul roads and reduce mine dust. Water trucks load water from refilling stations and traverse the road to spray water. After the water is exhausted, the water truck travels toward one of water stations for refilling and then continues to traverse the roads to satisfy the watering patterns. The water trucks run 24 hours per day.In practice the watering frequency of each road is related to the traffic intensity of haul trucks. The period of effectiveness, after the road has been watered, can range from 30 minutes to 3 hours. Regular light watering at approximately 0.3-0.5l/m2 is much more effective than infrequent heavy watering. To simplify the problem each road will be assigned a watering frequency (e.g. every 60 minutes) and a sliding time window (e.g. 10 minutes). The water can therefore be sprayed on the road within the given time window (e.g. 50 to 70 minutes). If the trucks service the road more frequently than every 50 minutes the road will be over watered and this can cause a host of problems. If the trucks water the road less frequently than every 70 minutes dust aggregation will start becoming problematic. In order to satisfy the water demand of the roads, it is possible that a truck waters a road segment first, then travels along the next road segment without watering it, and then waters another road segment. The road segment that a water truck traverses without watering is called a dead heading. A bidirectional road has to be watered in each of the two directions Empty water trucks are refilled at the refilling stations. A refilling station can serve a limited number of trucks at the same time. Also, a limited number of trucks can wait before being refilled. Hence, every refilling station has two kinds of capacities: the capacity for refilling the trucks and the capacity for holding trucks. If a refilling station is overloaded, some trucks need to be reassigned to a different refilling station. My main problem at this stage is how to model the dust aggregation on the haul roads. I started by setting up each road as a source server sink and then only displaying the server queue. The entities can then be modeled as dust clouds. The trucks then tend to the servers as operators. This still does not give the desired outcomes. I’m struggling to schedule the trucks to move on the shortest route and then return to the nearest filling station once they have depleted their water supply. Does anyone have any other ideas on how to approach the problem? Thanks for your help! Regards Carl-Gustaf Gericke
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