A little insight into my project:
I am trying to simulate a 6-floor inpatient hospital building. Where the patients that come in stay for a night or two and then leave, super simple. However, I want to add the task so that nurses prepare the patients room beforehand and that has proven to be harder than expected. After having tried multiple different methods I seek for your help for inspiration.
To keep the model as simple as possible I have only one Seize for all the floors due to restriction on the number of blocks. In that Seize I call a function that differs all the floors apart:
The seize for the rooms
The function that differs the floor apart
A similar function is for the nurses, a simple if-sentence that returns the right nurses.
Now for the hard part, the ResourceTaskStart.
I have multiple ResourcePools for this one seize so I haven't been able to connect them somehow together with the ResourceTaskStart. I can't call an agent.parameter as I have been doing in all these functions. I have tried to create a variable that returns a number as seen in my second picture "floor1 = 1" as an example. These variables should direct the nurses to the right location as seen in the following picture.
The ResourceTask set up
As seen in the picture I have ResourcePool for each of the floors that are initiated by the Seize "Rooms". These ResourceTaskStart and MoveTo are as following:
ResourceTaksStart block
MoveTo Block
However, when I run the model I keep getting a different error message for each run and on different time. Sometimes I have 88 patients go through with no problem, then 104 and even 244 patients but there always appears some error like these here:
First run:
Exception during discrete event execution
root.MoveToWard5:
Unit root.ward5 not found in the units seized by 276
Second run:
Exception during discrete event execution
root.MoveToWard8:
Unit root.ward8 not found in the units seized by 265
Third run:
Exception during discrete event execution
root.MoveToWard7:
Unit root.ward7 not found in the units seized by 353
This mismatch in the error message makes it difficult for me to decode and I have no idea why this error is appearing.
My question: Do you have any idea what the problem might be or do you have any idea of a better way to simulate this problem?
If you need any more information please comment and I will provide them.
Related
I hope you are having a great day.
Recently, I tried to build an AnyLogic model with free-space transporters, but I encountered an unexpected situation as shown below.
I thought that there is no logical reason why all the transporters are jammed in a specific position. Is there any solution or possible reason for this situation? I have attached my model for your information.
Thank you for reading this question.
The problem with the traffic jam appears to be due to the fact that there are two few attractors available for the transporters to place the items and then they get stuck waiting for an attractor to become available...
When running your model as-is I get a jam in the stage one area
And in the logic blocks, I can see that the transports are stuck in the "Move By Transporter" block.
If I assume the attractors are set to 4 for a reason I would suggest the following logic - similar to what is described here
You create a list of all the attractors available. See the neat trick in AnyLogic where if you select a bunch of objects and then right-click on them you can automatically create a collection.
You can call it something like attractorsAvailabeStage1
And create a new map to store the WIP agents that will be occupying the attractors
And have a function that will provide the available attractors.
Change the move by transporter option to move to an attractor
And also return the attractor as available once it gets moved from its location
Now you only need to prevent mew agents from entering the area if there is no more attractors left or agents on their way to the attractors
I tested it and it works great for stage 1 you need to do it for all the stages.
On second thought....
seeing that you do have resource pools and service blocks. You can achieve the same logic I described by having resources first size the locations, then go to the transport block, and then be delayed
You first seize the space in the stage, then you move to the space, then you delay it.... then you wait, then seize the space in stage 2, then move there, then release stage 1.
I would go for the latter option
I've a question. In my model I want to model patients/employees in a hospital environment as agents. Due to the big amount of patients/employees in the hospital (>4000), my model runs very slow (which is logical, I know). Because I want the patients employees to block eachother and AGVs, I let them move by a transporterfleet (which has >5000 capacity), by doing this method I can make it possible to let them block eachother.
Now what I want is that when the patient or employees arrive to the location departments they disappear for hours/minutes as long as there appointment or workschedule is saying to them. The most perfect is to just delete them for example 4 hours of runtime, so that I will only have the moving agents in my model, is there a way to do this? So that when a patient/employee arrives at an appointment, the agent and transport disappears for 4 hours and returns after this delay, keeping in mind that it should speed up the run-speed of my simulation (otherwise I just can use a delay block, but than my model keeps very slow). The transporters are making the model really slow.
Or perhaps another method will be better to model the patients and employees with the feature that they are blocking AGVs? An option which I should think of is that an moving agent is constantly checking if there is an agent close to him every second, but I do not know if this will be speed up the runtime or just will slow it down even more with >4000agents.
Or another option is that I only let the AGVs check if there are agents around them every second just by coding(this will only be around 40 agents).
Also you see that it is only using 5% of my memory data..
Thanks.
I am trying to simulate a manufacturing assembly process, where material items are processed following an unique line. In the quality control stations, when a failure is detected, the object is sent to the repair area (by a truckpallet) and, when it is repaired, the same resource takes it and puts it at the start of the line. Until this point, I already programmed it.
The problem is the following: when it is a repaired object, is has to follow the same conveyor but with no stops in the stations. The object must enter a station and leave it, with no delays (as the works related with the stations have already been made).
I thought the best would be to consider the difference (repaired vs. not repaired) in the Agent, but then I can't work with it in the Main agent... I have also tried alternative solutions, for example defining variables in each station 1 and consider that in the stations delays and in the following station:
triangular( 109.1*delay_bec, delaytime_bec*delay_bec, 307.6*delay_bec)
Actions - in finished process:
if(delay_bec==0){
delay_headers=0;
delay_bec=1;}
But nothing worked... Any help?
I thought the best would be to consider the difference (repaired vs. not repaired) in the Agent, but then I can't work with it in the Main agent...
This is actually the correct approach. You need to create a custom agent type, give in a boolean variable isRepaired (or similar) and then in the delay you can dynamically adjust the duration using that characteristic:
agent.isRepaired ? 0. : 100
This will delay normal agents by 100 time units and repaired agents not at all.
Obviously, you must make sure that the agents flowing through the flow blocks are of your custom agent type (see the help how to do that)
I am using Anylogic for a simulation-modeling class, and I am not anylogic or coding smart. My last and only coding class was MatLab based about 16 yrs ago. I have a few questions about how to implement modeling concepts in a discrete model with anylogic.
How can I add/inject agents directly into a queue downstream from a source? I have tried adding an additional source to use the “Calls of inject() function,” but I am not sure how to implement it after selecting it ( example: what do I do after selecting the Calls of inject() function). I have the new source feeding directly into the queue where I want the inject.
How can I set the release of an agent to a defined schedule instead of a rate? Currently, I have my working model set to interarrival time. But I would like to set the agent release to a defined schedule. (example: agent-1 released at 120 seconds, agent-2 released at 150 seconds, agent-3 released at 270 seconds)
Any help would be greatly appreciated, especially if it can be written in a “explain to me like I am 5yrs old” format.
Question 1:
If you have a source connected directly to a queue, then when you call source.inject() an agent will be created at the source block and go to the queue. If you have 1 source with multiple possible destinations, then you will have to use select output blocks and some criteria to go from the source to the desired queue.
Since you mentioned not being a strong programmer, this probably wouldn't be for you, but I often find myself creating agents via add_population and then just adding them to an ArrayList until I am ready to pull them into the DES flow. Really, there are near infinite ways to control agent flow within AnyLogic.
Question 2:
Option a: Arrivals by "Arrival Table in Database" You can link an AnyLogic database table to Excel, and then the source block will just have an agent arrive based on that table.
Option b: Arrival Schedule - you could set this up manually within the development environment or load your schedule from a database. I prefer option a over option b given your brief description.
Option c: Read in data to variable and then write code to release based on next arrival time. 1,000s of ways to do this, but one example could be a list of doubles (your arrival times), set an event to delay until next arrival, call inject function, remove that arrival from the list. I think option a would be best for you, but given that AnyLogic allows you to add java code, there are no limits to how sophisticated you could make your arrival logic.
For 2) You could also use an event or a dynamic event. The action could be source.inject(1); and you can schedule them to your preferences with variables. Just be vigilant that you re-start the events if necessary.
There is a demo-model from AnyLogic for dynamic events.
I am making simple distribution center in Anylogic.I did make truck agent and i am able to move it from one gis point to another gis point.
But I want to load some other agents(Let's say banana agent) into my truck agent and then trucks start their journey(if truck is full of banana).How can i do this?
I hope you have already solved your problem from almost a year ago. However, since there is no specific answer, I'll leave it here for anyone who might get stuck with the same problem.
Anylogic's Process Modelling Library (PML) has an element called Pickup and its opposite, Dropoff. This is used to do exactly what you asked: to load some element into a transporter (either a truck, a forklift, or even a person).
To use the block as you asked you would need a topology like in the picture:
The Queue elements are necessary to hold elements until the pickup occurs.
The Pickup element might pick elements in three modes:
While a given condition is True;
An exact amount (if available);
All available agents.
I'm assuming all trucks must be completely filled up to its maximum capacity. Hence, the chosen mode will be the second one where the exact amount will be TruckCapacity, a parameter of agent Truck.
The selected mode picks up agents (in this case Bananas) up to the desired amount. However, if nothing is available or the present amount is inferior to the desired, the native behavior of the Pickup block is to allow the container element to simply go through it and pick only what's available.
To prevent such behavior, I've created a restricted area where only 1 Truck can be at a time. Additionally, the Hold block WaitFullyLoaded (set to initially blocked) forces the container agent Truck to be fully loaded. Whenever a Banana enters the Queue waitTruck, a verification is performed to check if 1 Truck can be filled. If so, allows passage for that one truck:
if(self.size()/TruckCapacity>=1){
WaitFullyLoaded.unblock();
}
To block WaitFullyLoaded again, when the truck passes through the restrictedAreaEnd block, it performs WaitFullyLoaded.block();
The main idea is this. However, many features can be added and changed.
Hope this helps,
Luís