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  1. ... I have made this demonstration (model attached) that I would like to: - Stop creating entities (source1 and 2) due to failure of Server1 - Start creating entities (source1 and 2) due to fixed of Server1 - Continue this cycle if more failure should occur from server1. - Thomas Simple model for waiting position.spfx
  2. MultiFailureServer.spfx [/img] in response to the above thread: http://www.simio.com/forums/viewtopic.php?f=1&p=9187#p9187
  3. Hi everyone, In my model, I'm trying to simulate an assembly line that has five machines. First machine needs to define seven types of failure event, and seven type for time to repair, four types of failure for second machine, three types for the third machine, six type for fourth machine and five types of failure for the last machine, each failure event and repair type has its own distribution. However, in the reliability logic properties on the Server only allow for one way to generate failure. How can I model this condition? Any suggestion will be appreciated!
  4. Thank you for your replying, this SimBit define only one failure in the reliability logic properties(Processing Time Based Failure) and one by using Add-on process logic (Processing Count Based Failure). However, in this model I need to define seven types of failure event (Processing Time Based Failure), and seven type for time to repair only for one server, each failure type has its own failure and repair distribution, is there approach in simio can define this? For example for first server, time to failure and time to repair distribution as follow: Time to Failure: Loglogistic(2.62 , 0.67) , Weibull(208 , 0.62) , Lognormal(152 , 14) , Weibull(7.63 , 1.188) , Exponential(500) , Exponential(597) , Generalized Gamma(0.01 , 0.15) Time to repair: Lognormal(4.45 , 3.69) , Loglogistic(1.37 , 0.26) , Generalized Gamma(0.483 , 0.013) , Weibull(7.2 , 1.8) , Loglogistic(1.37 , 0.26) , Loglogistic(2.1 , 0.1) , Lognormal(6.4 , 4.9)
  5. Hi Jeff, I present another, and I think, a more compact approach in the attached model. In this model, I subclassed flownode object. And define a timer element in it. I also defined two properties in this subclassed object as Time_to_repair, time_to_failure. By this way you can use these properties to assign failure times and repair times after failure seperately. hope this helps! all the best, gocken Development 02_subclassed.spfx
  6. I have two workers: mainworker and repairman. There is one server that fails every 10 minutes and repairs every 1 minute after failure. When the serer is failed, mainworker should go to the homenode and repairman should come to the server. When repaired the mainworker should comeback to the server. When I run the model, i get an error unable to release resources because the number of resources seized and satisfying release criteria is only 0. The one with Worker for Repair and worker test.spfx
  7. Hello, I am modeling a range wherein if a workstation encounters a failure while processing an entity, that entity needs to be destroyed and can't simply wait for the workstation to be repaired and then continue processing. The real world application models a failure of a critical piece of gear on boat, which would have to cancel the mission and return to port for repairs. In my case the mission (the entity) cannot wait for the repair, it must be canceled and start the whole process again later. I am really struggling to implement a process where the entity encountering the failure is destroyed when the failure occurs instead of just waiting around. Thanks for any help anyone can offer!
  8. Hi all, I made a model of a production line (starting with 2 servers) and I am wondering whether it is possible to change the processing time of the second server based on the actual output of the first server. Theoretically seen the processing time of the server 2 = Speed of server 1 * E , in which E is a fixed formula (connected to server 2) to correct the speed. So if the first server performs according to expectation (without failures) for example 40 the processing speed of the second server is equal to 40*E with a delay of the conveyor time between server 1 and server 2. If the server has failure and thus have a lower output (for example, 30), I want to change the processing time of the second server accordingly to 30*E with a delay of the conveyor time between server 1 and server 2. Does anybody have an idea of how to do the following: How can you monitor the actual output of the first server at each timestep? Is it possible to fix the proposed formula and use it in an add-on process? How can you take the conveyor time delay into account (using a delay step in the add-on process?)? I am quite new to the software so I am not sure whether it is possible to model this in Simio. Thank you in advance!
  9. Thank you, i used the server1.failure.active expression. However, i want to use the average server productivity and not an entity dependent time. How would you express the productivity of a server in a model state variable?
  10. Sure. It depends on your model logic/design. I would suggest using Server1.Failure.Active expression as a process time parameter. This expression return 1 when Server1 stops due a failure, otherwise it returns 0.
  11. Thank you for your response! But im not sure: Is this also possible if the model is extended to 6 servers? So each server processing time is dependent upon the one in front? I thought I would need to make different state variables for every server (machine) For example:a machine in a production line needs to slow down with a delay if the machine upfront has reduced or zero speed because of failure.
  12. One machine in my model needs to realize three type of failure event during the simulation. The first type of failure will happen every random.expo(3) minutes and need an operator to adjust it, the second type of failure will happen after every 100 entities be processed and need the same operator to deal with, the third type of failure is random.exponential(3) days and need engineer to repair. All the three types are independent occurred. How can I model this condition? Any suggestion will be appreciated!
  13. Hi Simio, I want a resource to incur a charge whenever it fails -- imagine a tool that is replaced every half year, a new tool will need to be bought when the old one fails -- and also incurs a cost at the initialising of the run -- the first tool bought also has a cost associated with its purchase. If the solution involves using add-on processes, can properties in add-on processes be changed by changing a value in a connected excel sheet? Thanks Kevin
  14. I want to set a timer that represents "time of failure" where if the entity is not processed within this time, it will be deemed a failure and be destroyed. This time needs to be dependent on a random draw (one for entity type, and one for a distribution based on entity type). I also need to be able to change this time due to interventions that happen. Is it possible to do this?
  15. Hello! I'm trying to model an assembly line that has several unit (entity) types run down it. I have a table set up determining processing times for each entity types and that works fine. I tried the same syntax for the Reliability Logic (for both uptime between failures or count between failures and the time to repair) but I keep getting errors saying there is a problem determining the row to use in my table. I've tried different tables and several failure types and I'm stuck. I also tried add-on processes to SetRow via the Token object, but that didn't help. I even tried copying and pasting the exact same syntax I have for the processing time into the reliability logic, and it still gets stuck. Can I not call on table references in my reliability logic? Thanks! Kaylinn
  16. AHH! I understand now. I guess we've always cheated and done it with server/workstation reliability logic (because for the most part, our FPY is our reason for downtime, not our servers/workstations actually being broken). So do you know how I would I do what I'm looking to do? Is there a property I can add to the entity that would be called upon as a FPY at each station? To add an extra layer of difficulty, the failure rates won't be the same at every station. For example, Entity A at station 1 might have a FPY of 90%, Entity B at station 1 has 85%, Entity A at station 2 has 95%, and Entity B at station 2 has 50%, if that makes sense. Thank you for your help!!!
  17. I am confused at your words'failure' , it is actually FPY, not the same concept...failure is the Machine breakdown, FPY is the first pass rate for products.
  18. @jzhou I'm confused why you're confused. I have several entity types (in the real world, they're hydraulic pumps and motors). They all go through the same stations on the assembly line, but they don't all fail at the same rate. For example, our motors have a FPY of 90% per say, but one model of pumps is closer to 55%, while another is 75%. We build to order, so I could run any part at any time. And each part has it's own failure rate and general repair time at each station. @CWatson I think I get what you're going for. But wouldn't that still tie a single failure rate to my station instead of a dynamic rate/time based on unit type? Thanks!
  19. Is there a way to check if a server/workstation etc. is operational, failure or in setup? If so what is the syntax?
  20. Hello, I am trying program a model , I need to know if is possible programing failure event in a objet SINK and SOURCE. the model has SINK and SOURCE elements and a vehicle, the vehicle is responsible for carrying bodies from the Source points to SINK, vehicles are subject to failure and this in its definition, but I need that SINK is also found 20% of the time fails. there any native method to do so?, with an event I can generate timer events scheduled but I need to SINK probabilistic variable. this change or what process should be carried out in the model or have to copy the object and create a new process?. Not able to find some simbits failure to occupy, if anyone has any examples or know how. Regards Cristian.
  21. Hello Simio Community! In my current project I want to show how Failures affect a business process, when they occur at a certain time during the day. My problem is that I don't understand how to invoke these Failures let's say between 7.00 and 9.00am every day. When I try the Event based Failure item there is not possibility for changing the settings of an event. Plus I don't know how the calendar based Failure system works. Does anyone have experience with that kind of Failure-Setting? Thanks, Thomas
  22. Hello everyone, I would be glad if someone could help me with this: I have a machine defined as a subclass entity that suspends its movement when it goes in failure. I would like to move a worker to the machine when that happens in order to fix the failure. How can I do this, since I do not know the exact position of the machine when the failure occurs? Thanks
  23. Hello Simio Insiders! Currently, our group is working on a project regarding queue-systems and how to optimize them. We´ve chosen to look at Burger King and how they operate. Here, we would like to come up with a few suggestions (through simulation) about how they can do things differently. For example, how an extra worker would affect the queue or how a decrease from 5% to 1% in machinery failure can affect their revenue. We’ve managed to set up a rather simple model with the source, the order point, three different stations depending on what the customer orders (set up with discrete distribution) and a sink. We´ve also added a worker entity as seen in our model. The reasoning behind this is that the worker enters the order point when the customer sets the order and then follows the path to either one of the three following stations depending on what the customer has ordered. However, our current problem is that the worker passes by all three nodes every time an order is placed and he ends up at the same station every time as well (3rd station). We would really appreciate any kind of feedback that we can get. We’ve watched multiple YouTube videos concerning Simio, but we haven’t really found a video that highlights these exact problems that we’re mentioning. Best regards, Haris Sabic Model - Haris Sabic.spfx
  24. Am I must missing something, or is there really no failure and repaired event on transporters? When ever I make a new vehicle, it is one of the first functionalities i add in. Is this something you would like to see default in future transporters? I even added a token poll, because I haven't made one in a while.
  25. Hello! In my model, there are 5 machines running for production. Each machine has opportunity to be failed, the mean time between two failures is exponential(4.5) hours, and the repair time will last triangular(20,25,30) minutes. I use 5 Resource to represent these 5 machines and place them on the canvas because I want to see the state changing of each machine during the model running. Five entities will be created at the time zero simultaneously and the Source will only create 5 entities, those entities arrive at a Server which capacity be set to 5 and the Server’s processing time is exponential(4.5) hours. When one entity go out the Server, it means one machine (Resource) failed. My question is how can I find the corresponding resource related to this entity and change its state to failure and then after certain time duration of repairing to change its state to busy. Say, if entity 3 go out the Server, then I need to set the state of Resource 3 to failure and then change it back to busy. I want to use list or table to achieve my job such that the model can fit for very large amount of machine’s condition, e.g. 1000 machines. Thanks!
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