Exercise - Assembly-Line Balancing
The time to perform each task and the tasks that must be immediately preceded are shown
below:
Task
Time (Minutes)
Immediate Predecessors
A
0.25
-
B
0.08
A
C
0.12
B
D
0.17
B
E
0.06
C, D
F
0.05
E
G
0.09
E
H
0.11
E
I
0.16
F, G, H
J
0.08
I
If 150 products are needed per hour and 50 minutes per hour are productive. Calculate the
following:
(a) Develop the precedence diagram.
(b) Compute the cycle time per unit in minutes
(c) Determine the minimum number of work stations.
(d) Use the longest-task-time heuristic to balance the production line.
(e) What is the efficiency of this assembly line balancing?
Exercise – Process Layout
Determine the placement of departments for a newly designed layout facility that will
minimize the total material handling costs using the data in the following table 1 and table 2.
Assume that reverse distances are the same. The current layouts are shown in the grid below.
Use a cost of RM1 per trip.
[Tentukan perletakan jabatan-jabatan untuk rekabentuk susunatur fasiliti baru yang akan mengurangkankan
kos keseluruhan pengendalian bahan dengan menggunakan data dalam jadual 1 dan jadual 2. Andaikan
bahawa jarak yang terbalik adalah sama. Susunatur asal ditunjukkan mengikut grid di bawah. Gunakan kos
RM 1 untuk setiap kali perjalanan.]
Current Layout. [Susunatur asal.]
Departments A
(Room 1)
Departments B
(Room 2)
Departments D
(Room 4)
Departments C
(Room 3)
Table 1 [Jadual 1]
To [Kepada]
From [dari]
1
2
3
4
Distance between rooms (meters) [Jarak antara bilik (meter)]
1
2
3
4
40
80
70
40
50
60
-
Table 2 [Jadual 2]
To [Kepada]
From [dari]
A
B
C
D
Loads between departments [Beban antara Jabatan]
A
B
C
D
10
20
80
40
90
55
-
You are required to:
[Anda dikehendaki untuk:]
a) Analyze current “load x distance” of the current layout shown and compute its
movement costs.
[Analisa “beban x jarak” semasa untuk susunatur sedia ada yang diberikan dan hitungkan kos
pergerakannya.]
b) Propose a new layout and compute its movement cost.
[Cadangkan susunatur baru dan hitungkan kos pergerakannya.]