Algorithms for Load Profile Calculation
One of the problems associated with the use of simple algorithms is that an operation can extend across several load periods (see Figure 13.2.2.2). This exercise will examine how manul or computer algorithms establish capacity and load in a load profile.
Use Figure 13.7.2.1 to enter the capacity or load curve (continuous or rectangular distribution within a time period) for a work center, given the problem outlined below.
(COLUMN CANT COPY)
Fig. 13.7.2.1 Load profile calculation.
a. Determine the start date of each period and enter it into the figure above, given 2 weekly periods of 3.5 days each ( $1 / 2$ calendar week): Sunday morning to Wednesday noon and Wednesday noon to Saturday evening. The load profile starts with Sunday morning, May 9 (as indicated in the figure). The load profile covers 6 periods (3 weeks).
b. Allocate theoretical capacity to each of the 6 time periods, respecting the following data: At the work center, the plant runs one 8-hour shift per normal workday ( 8 a.m. to 12 p.m., 1 p.m. to 5 p.m.). The work center has 5 identical machines. Saturdays and Sundays are off. Furthermore, May 13 and May 24 are public holidays (in practice, these dates would change each year). Note that "today," or the moment of the inquiry, is 7 a.m. on Wednesday, May 12.
c. Assume no existing load on the work center. For the following operation, allocate its standard load to the work center: Operation start date is Friday morning, May 14. Standard load (including setup) is 81 hours. The operation can be split on 2 machines, maximum.