Your second assignment from the text is Problem 3.14. It is due Wednesday, 2/4/09.(negotiable)
You may submit this assignment alone or in groups of up to four students. If you submit the assignment in groups, copy the your other group members in your e-mail, and list your name and the other students names in the text of the e-mail. In the text of of the e-mail list the values for the requested statistics: average number of machines down and the average utilization of the repair technicians as a group. Submit a working *.doe attached to an e-mail to your instructor. I have not yet got D2L setup for the class.
No write up for this short assignment.
Problem 3.14 is listed below. Below that is the checksheet that I will use for grading the assignment.
3.14 Five identical machines operate independently in a small shop. Each machine is up (i.e., works) for between six and ten hours (uniformly distributed) and then breaks down. There are two repair technicians available, and it takes one technician between one and three hours (uniformly distributed) to fix a machine; only one technician can be assigned to work on a broken machine even if the other technician is idle. If more than two machines are broken down at a given time, they form a (virtual) FIFO "repair" queue and wait for the first available technician. A technician works on a broken machine until it is fixed, regardless of what else is happening in the system. All uptimes and downtimes are independent of each other. Starting with all machines at the beginning of an "up" time, simulate this for 160 hours and observe the time-average number of machines that are down (in repair or in queue for repair), as well as the utilization of the repair technicians as a group. Animate the machines when they're either undergoing repair or in queue for a repair technician, and plot the total number of machines down (in repair plus in queue) over time. (HINT: Think of the machines as "customers" and the repair technicians as "servers" and note that there are always five machines floating around in the model and they never leave.| Exercise 3-14 | ||||
| Student's Names | ||||
| Check sheet | grade | Max | ||
| E-mail
Statistics time-average machines down 5 utilization of repair techs 5 Uptime block |
5 | |||
| correct Unif(6,10) | 5 | |||
| just a delay |
3 | |||
| Repair block | 5 | |||
| Unif(1,3) delay queue | 5 | |||
| one repair tech used | 3 | |||
| Resource correct capacity | 5 | |||
|
Animate |
Machines in Repair | 5 | ||
| Machines in Queue | 2 | |||
| Plot | ||||
| number of machines down | 5 | |||
| Run for 160 hours | 2 | |||
| Program runs correctly | 10 | |||
| sum | 65 | |||