- Read the article at http://roywant.com/cv/papers/2006/2006- 01%20(IEEE%20Pervasive)%20GE%20RFID%20(print).pdf and answer the following
- In which three areas have traditional applications of RFID technology received much media attention?
- RFID technology with static readers has found new applications in three industries. What are they?
- Computer Products Corporation will soon add a new wing to its present manufacturing building to make electronic assemblies. The two alternative layouts being considered by management and other relevant information are shown below:
Layout I Layout II
Between-department distance (feet)
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Between-department trips Layout I Layout II
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| 1-2 | 12 | 25 |
| 1-3 | 12 | 15 |
| 1-4 | 19 | 23 |
| 2-3 | 22 | 10 |
| 3-4 | 15 | 36 |
| 3-5 | 22 | 26 |
| 4-5 | 25 | 20 |
| 4-6 | 21 | 19 |
| 5-6 | 25 | 22 |
| 5-7 | 25 | 30 |
| 6-7 | 20 | 20 |
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Sequence of processing assemblies through departments
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Electronic assembly Processing sequence Number of batches to be produced per year
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| K5 audio | 3-4-6 | 200 |
| P55 power unit | 2-3-4-5 | 1,200 |
| T22 stabilizer | 1-4-6-7 | 1,400 |
| U69 equalizer | 3-4-5-7 | 300 |
| Z4 converter | 1-2-3-5-6 | 400 |
———————————————————————————————————————————-
Perform a load distance analysis to determine which of the two layout is more efficient and why.
- Consider the following assembly line consisting of four workstations (A, B, C, and D), where the darkened area between two successive stations is a buffer. Suppose that the assembly process begins at 1:00 m.
|
Station
Station time (minutes) 3 2 7 5
- Which station is the bottleneck of the assembly process? What is its station time?
- Complete the table below by entering the correct start and end times for each of Units 2, 3, 4, and 5 at each of the four stations:
| Station | A | B | C | D | ||||
| Unit no. | Start time | End time | Start time | End time | Start time | End time | Start time | End time |
| 1 | 1:00 p.m. | 1:03 p.m. | 1:03 p.m. | 1:05 p.m. | 1:05 p.m. | 1:12 p.m. | 1:12 p.m. | 1:17 p.m. |
| 2 | ||||||||
| 3 | ||||||||
| 4 | ||||||||
| 5 | ||||||||
- Obviously, Unit 1 is completed and rolls off the assembly line at 1:17 m. Based on your work in Part (2) above, answer the following questions:
- What is the time elapsed between Unit 1 rolling off the assembly line and Unit 2 rolling off the assembly line?
- What is the time elapsed between Unit 2 rolling off the assembly line and Unit 3 rolling off the assembly line?
- What is the time elapsed between Unit 3 rolling off the assembly line and Unit 4 rolling off the assembly line?
- What is the time elapsed between Unit 4 rolling off the assembly line and Unit 5 rolling off the assembly line?
- Are your answers to (a), (b), (c), and (d) in Part (3) above identical? Are all of the times elapsed equal to the station time of the bottleneck in the assembly process found in Part (1) above?
- Can you conclude that the station time of the bottleneck determines the speed and the output rate of an assembly line?
- The assembly of Comet personal computers, a generic mail-order PC clone, requires a total of 12 tasks and the job times (in minutes) along with the precedence relationships for this problem are summarized below:
Task Immediate predecessor Time
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| 1 | – | 6 |
| 2 | 1 | 3 |
| 3 | 2 | 3 |
| 4 | 2 | 1 |
| 5 | 2 | 1 |
| 6 | 2 | 6 |
| 7 | 3, 4 | 3.5 |
| 8 | 7 | 2.5 |
| 9 | 5, 6 | 0.5 |
| 10 | 7, 9 | 2 |
| 11 | 8, 10 | 3 |
| 12 | 11 | 3.5 |
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- What follows is the precedence diagram for the tasks involved in manufacturing a small mechanical part, where the task times are in
12 6 11 15 3
- Given an expected cycle time of 18 seconds, balance the assembly line by using the LTT
- Provide a graphical illustration of the task groupings obtained in (1).
- Compute the efficiency of the resulting assembly [Hint: This is very similar to the problem in Example 3.4.]