HW$4/$Resource Assignment and Scheduling

Peach Electronics wants your team to investigate improvements to one of its electronic component

manufacturing processes.

Components arrive at this process from two other plants. They arrive pre$-$assembled as either

Component $602$A or Component $917$AT$.$ Each component will arrive separately so$,$ initially, there

are two separate process lines until the Burn$-$In station where they will combine.

Component $602$A arrives in batches of $4.$ The time between arrivals is described as triangularly

distributed with a minimum of $10$ minutes, a mode of $25$ minutes, and a maximum of $30$ minutes. The

Component $917$AT produces batches of $8$ with an interarrival time described as triangularly

distributed with minimum of $10$ minutes, a mode of $25$ minutes, and maximum of $50$ minutes

between batches.

Once they arrive at the receiving dock, the components go through an involved testing procedure and

a burn$-$in operation before they are packaged and shipped.

At the test station, you will require a test person to operate each test machine. Testers are cross$-$

trained to work on either the $602$A or the $917$AT test station. Initial testing time at the separate test

stations for a $602$A component is exponentially distributed with a mean of $10$ minutes and for $917$AT

it is uniformly distributed with minimum and maximum values of $15$ and $25$ minutes. All components

are tested where historically, $14\%$ of all units will fail and require rework. Testing of $602$A and

$917$AT should be prioritized by highest attribute value.

Rework is accomplished by a rework person at separate $602$A and $917$AT rework stations where units

are typically processed on a FIFO basis. Reworkers are also cross$-$trained to work either station.

Rework for $602$A$\text{'}$s can be done at a constant rate of $1$ hour and $917$AT's at a rate of $2$ per hour. A

reworked component requires testing again so all reworked components return to the testing queue

where it has priority over non$-$reworked units. A unit can fail multiple times and be reworked

multiple times. Rework of $602$A and $917$AT should be prioritized by first in$,$ first out.

Once a component passes testing, it is ready for burn$-$in$.$ Burn$-$in causes the component to be

exercised for a period of $1\mathrm{.}5$ hours for $602$A$\text{'}$s and $2\mathrm{.}0$ hours for $917$AT's. Burn$-$in is done on a large

rack machine where the component is automatically plugged in $($no worker needed$).$ This rack

machine will allow up to $60$ units to be burned$-$in simultaneously. Historically, $97\%$ of all units pass

the burn$-$in and go on to final packaging. $3\%$ fail and are trashed.

Final packaging requires a packager worker where labeling and boxing are done. This job is

normally distributed with a mean of $8$ minutes, standard deviation of $2\mathrm{.}3$ minutes.

Run the simulation for $160$ hours at $8$ hrs$/$day and make appropriate recommendations to this

company given the following information:

$-$ The selling price of the finished components are:

$-$ $$100$ for each good $602$A board and $$125$ for each good $917$AT board as final packaged

units.

$1$ of $2$

$-$ Personnel costs are:

$-$ Test Technician makes $$22\mathrm{.}00$ per hour

$-$ Rework Technician makes $$15\mathrm{.}00$ per hour

$-$ Final Packaging Worker makes $$10\mathrm{.}00$ per hour

$-$ Reworked material costs are $$25\mathrm{.}00$ per unit reworked.

$-$ Trashed components cost $$20\mathrm{.}00$ per unit trashed $($after burn$-$in$).$

$-$ You cannot have more than $25$ test stations because it$$s too expensive.

Your objective is to maximize the net profit $($totalprofit$$-$laborcost$$-$reworked$$-$trashed$$).$ Change

your resource numbers to help you maximize your net profit. Tell Peach Electronics your findings or

recommendations. Set up SIMAN as your output report