ATTENTION

This FlexSim Community Forum is read-only. Please post any new questions, ideas, or discussions to our new community (we call it Answers) at https://answers.flexsim.com/. Our new Question & Answer site brings a modern, mobile-friendly interface and more focus on getting answers quickly. There are a few differences between how our new Q&A community works vs. a classic, threaded-conversation-style forum like the one below, so be sure to read our Answers Best Practices.


flexsim.com

Go Back   FlexSim Community Forum > FlexSim Software > Q&A
FAQ Downloads Calendar Search Mark Forums Read

Q&A Using Flexsim and building models

Reply
 
Thread Tools Display Modes
  #1  
Old 03-06-2012
Jack Lai Jack Lai is offline
Flexsim User
 
Join Date: Nov 2011
Posts: 32
Downloads: 17
Uploads: 0
Thanks: 22
Thanked 0 Times in 0 Posts
Rep Power: 99
Jack Lai is on a distinguished road
Default lower operating time of servers

Hi, in my model, it has a checking logic to check if the servers breakdown or not every 8 hour. An the breakdown percentage will change every 24 hours. I use year 2011 as the time-slot and divide it into monthly and weekly.


When the simulation run for 8 hours, a checking logic in MTBF MTTR table is used. A random number is generated by the formula dnuiform(0,1000) , and then I used this random number compare with the operating percentage I set to decide if the server breakdown or not. However, I tried to do simulation for 20 time and found the simulated total operating hour of each server is normally lower then the estimated hour calculated by excel as input data around 100-300 hours (total simulation time is 8760 hour) . I think this factor quiet affect the simulation result. Is that any problem of random number generation ? Is that the random number is not random enough ? Or there are some error in my checking logic??

Also, during simulation, I found that there is a server state called "setup" occurred, it occupies about 50- 600 hours, what does this state means ? Is it a processing state ? If not, how to cannel it in my model as I just want the server in one of [processing, idle, breakdown] state.

Thanks in advice.
Attached Files
File Type: zip operation time.zip (476.8 KB, 89 views)
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Displaying the simulation time with the various date/time formats. Regan Blackett Tips and Tricks 12 11-12-2012 08:01 AM
Running Flexsim on an Apple Mac under the windows operating environment Dirk-Jan Q&A 1 07-22-2010 03:45 PM
Choosing the lower queue Flavio Brito Q&A 8 07-20-2010 01:31 PM
How to Use the license in two operating system in One PC? syseo Installation 1 05-17-2010 10:43 AM
All time related values 0,0000001 time units delayed Patrick Cap Q&A 2 05-01-2009 01:50 AM


All times are GMT -6. The time now is 05:17 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Copyright 1993-2018 FlexSim Software Products, Inc.