I am trying to simulate manufacturing process by using statechart. And i have created agents for particular machines by statecharts and connecting those agents according to manufacturing process with help of resource pool, seize block and release block
My agent is passing through the resource pool and seize block. And I am expecting to run the model one after another seize blocks. However, when I run the model my all three statcharts are active at a same time, which I do not want. can anybody suggest me a possible way to avoid simultaneous process?
I'm assuming your manufacturing processes don't take 0 time. You're missing Delay blocks, causing all your blocks to execute at the same, instantaneous moment.
On a side note, what you're showing us isn't a statechart, but a flowchart.
Related
A source is producing "productA". "productA" is moved by a transporter called "agv" from node1 to node2. On the way between the two nodes I want to put several tasks like for example delay or queue. These tasks can be implemented by Process Modelling Library blocks. When using them you have to set an agent type. Which type do I use now? "productA" or "agv"? When using "agv" an error accurs because that type is not equal to the source agent. When using "productA" tasks from the process Modelling blocks are only executed for this agent, not for "agv". How to deal with that? Is there a way to create a new agent which contains "productA" and "agv" and overwrites the source agent? How will that not contradict with the transporter fleet block?
You need to use ProductA as this is the main agent flowing through the blocks. It just "uses" an AGV to be moved around, similar to a resource.
If you want to stop and do things with the product and the AGV, you use the SeizeTransporter block first, this makes your product seize an AGV.
Then, you can make them do anything by dropping blocks: queues, delays, Move By Transporter. Just make sure to finish up with a Release Transporter block when all is done.
I'm trying to represent a machine that works for a x amount of time before warning the operator that the oil tank needs to be refilled. Have in mind that the machine doesn't stop as soon as it send the warning message out. That way, the operator will wait until the machine stops any activity it had already started, and once it's done, he'll stop the machine and fill the tank.
In order to represent this process I'm using a Station block from the Material Handling library, that seizes a resource from a resource pool block, to which a downtime block is applied.
Is there a way to make the downtime block wait until the machine stops before performing the maintenance?
I also want to associate a resource pool representative of the operator to the downtime block, so that the operator is busy during the downtime, since he's the responsible for filling the tank. Can I do that?
Thank you in advance!
Is there a way to make the downtime block wait until the machine stops before performing the maintenance?
Yes, explore how Priorities work. Give your machine task a higher priority than the downtime task and ensure that the downtime block does not preempt other tasks:
I also want to associate a resource pool representative of the operator to the downtime block, so that the operator is busy during the downtime, since he's the responsible for filling the tank. Can I do that?
Yes, set the task type to "go to flowchart" and use a custom flow chart to seize from a resource pool (again, check the help on how to set this up in detail):
PS: Please only ask 1 question per issue always. See https://stackoverflow.com/help/how-to-ask and for AnyLogic https://www.benjamin-schumann.com/blog/2021/4/1/how-to-win-at-anylogic-on-stackoverflow
By following your advice I’m constructing small models to learn how to use AnyLogic and build my simulation.
I need discrete events diagram interacting with agent based, where the agent based will represent a “service process” based in a previous recommendation it was straight forward to trigger the agent based activity, but I cannot stop or suspend or delay the “delay” block, I tryed to use the “until stopDelay is called” function but I could not make it work, I decided to test with and cyclic event inside the discrete event agent and but was not possible. I am considering that maybe my approach is not correct, and I need to use a different strategy to stop the discrete events process while the agent-based process is running, however since agent based is attempting to simulate some human behaviour, I’m interested in the time variations this could cause to the discrete events process. So my question is how to stop or suspend the “service delay or the delay blocks and restart them from the agent based diagram?
If you just need to store an entity somewhere until Agent process is done then I would recommend using using a 'wait' block instead of a 'delay'. The whole point of a delay is to have a timed exit so suspending it doesn't align with the intended use-case. You can read more about 'wait' block here.
I found the the Job Shop model example, some blocks using stopDelayForAll(), with a "if" code block, so I noticed that it was using a parameter, so I made some changes and the code I'm using and worked is this:
if ( Inqueue >= queCap )
delay.stopDelayForAll();
"Inqueue" is a variable capturing data from the delay block and queCap is a parameter telling the queue block capacity.
I am modelling earthmoving operation. Every trench agent seize two transporters, one excavator, and one truck. When truck is released it will do some other job before been seized again by the same trench. So this process repeat until the trench will be empty.
The process is occuring for two three times without any problem but after two three times the trench agent is not go out of the seizeTransporter block (the one that seize truck). I have a delay block after the seizeTransporter block and it use Maximum Capacity. So it should not be a problem and it should not prevent the seizeTransporter block out port to push the trench out.
I noticed this is hapenning when the truck stop to resolve a collision. It looks like the collision cannot be resolved and the truck stay where it is for ever. :))
I have tried so many things that could solve this problem but none of them works.
There is an option in the material-handling library TransporterControl element to override transporter conflicts after some time. Maybe reduce the default timeout of 10 model time units, see below:
I'm a new AnyLogic user so hopefully this is a simple problem. I would like to use a block as to represent a storage area for items to be used in an assembly, I am using the delay block with delay time of 0, but maybe the queue block would be more appropriate? I have set up a model in which every X number of seconds a "truck" arrives and if the delay block contains less than a specified capacity of elements, the inject function is called to refill the block. This sort of works, but is seems that the agents are flowing through the delay block's out port and thus do not count toward its capacity (that makes sense to me...) resulting in my source blocks continuing to create agents when the system isn't ready for them. My delay block is followed by a "move by transporter" block which seems to be getting all of the delay blocks outputs immediately. There are only two transporters in my model and I am not sure why more than two agents can be accepted by the transporter block at a time. I set my transporter fleet to have a capacity of 2 but that did not solve the problem.
Any advice would be helpful! Perhaps a different approach is needed. My goal is to have an essentially unlimited pool of parts at the inlet of the factory, but only create agents when the downstream processes are able to pull them in. Thanks in advance!
Welcome to SOF :)
Best use a "Wait" block here:
Let your trucks dump stuff into "Wait" whenever they arrive. Your downstream block can now pull them when they are ready using myWaitBlock.free(someAgent for as many agents as they want to pull from it.
Similarly, you can use a Delay with infinite capacity and set its type to "Until stopDelay() is called". Then similarly as the "Wait" block, you call myDelayBlock.stopDelay(someAgent) when you want.
Another option: Use a hold-block in front of a normal (infinite) queue and unblock it when ready: myHoldBlock.unBlock(numToLetThrough) --> probably the easiest
PS: Please also check how to ask good questions here on SOF, yours is very long, much easier to understand with some screenshots :) --> https://stackoverflow.com/help/how-to-ask