-
. . 2556 16-18 2556
A Study of Working Performance of Shield Metal Arc Welding
1* 2 1,2
E-mail: [email protected]*
Kanok Mokmued1* Phairoat Ladavichitkul2
1,2Department of Industrial Engineering, Faculty of Engineering,
Chulalongkorn University, Bangkok
E-mail: [email protected]*
Fitts law (Fitts Performance)
6 (3 x 2 )
Abstract
Commonly work evaluating in Industrial Engineering uses working
time as a primary indicator. However the
skilled or professional work which have a variety of difficulty
level. May applied Fitts law concept to find the
work indicator for work evaluation as call as Fitts performance.
It can use for planning and evaluating. A metal arc welding is a
kind of skill work had studied be starting from establishing the
pattern of Index of
Difficulty from 6 condition (3 posture x 2 welding joint). Four
experience welders were recruited voluntary as the subject in this
research.
Keywords: Speed and Accuracy Trade off, working performance,
Index of Difficulty, Welding, Fitts law
1.
Speed and Accuracy Trade off
Fitts (1954) (Physical workload)
-
. . 2556 16-18 2556
-
2
1
1 Fitts law (Mackenzie, I.S., 1992)
Fitts
(Index of Difficulty : ID)
Fitts law
Human-computer interaction (HCI) Thomas (1996)
Fitts Law
Card
(1978) 4 mouse, joystick, step keys
text keys mouse
Fitts
ISO 9241-9
(2012)
(2012)
Fitts
(2011) Schmidt Fitts
(Cognitive Workload) Fitts
(Physical Workload)
Fitts Performance
Fitts Performance
-
(Type of
Pectoralis
Delto (Flat
Brachiora
2.
3.
(Weldin
Joint)
s Major
(Vertic
id t)
adialis
(Tee Joint
45
ng position)
(Horizontal)
cal)
Deltoid
Biceps
(Butt Join
t)
4
Trape
Brachii
t)
90
1
ezius
4.
5.
.
90
1
( )
( .)
( .)
: BMI
: BMI =
2 5 .
1.
2.
3. 3.2
4.
16-1
A
42
60
160
23.43
( ) 20
( .) /
2
2
3
2 .
18 2556
B C
25 3
56 5
168 16
3 19.84 21.
1 32 ( .)
24
2
110 x 70
300 8
350 .
8 .
. . 2556
C D
6 25
6 70
62 170
.33 24.22
3 6
4 x 18 .
. . 90
-
. . 2556 16-18 2556
100 . 2
(Butt Joint) (Tee Joint) 3
5.
6. IXUS 75
7.
8.
3
6.
1.
2
6 (3 x2 )
(VB) (HB) (FB) (VT)
(HT) (FT) 5
2
2
H V F
B
T
: H = Horizontal V=Vertical F=Flat
B = Butt Joint T= Tee Joint
3.
(Movement Time ; MT) 100
.
7.
1.
2.
30 3.
10 2
4.
(Visual Inspection)
(Acceptance) (Rejection) ISO 5817
8. (Input)
4 A , B , C
, D , E , F
9. (Output)
A B C D E F
4 (output)
-
. . 2556 16-18 2556
10.
6
Movement Time (MT)
5-8
. 5 Movement Time A
.
6 Movement Time B
. 7 Movement Time C
.
8 Movement Time D
ID MT
ID
,
3
3 ID MT
-------->
A HB VT VB HT FB FT
B HT VT HB VB FT FB
C VT HB HT FB FT VB
D HB VT HT FT FB VB
ID
ID ID
(X) ID
(R2) ID R2 4
4 x R2
A y = 0.8855x + 76.674 0.4871
B y = 1.0979x + 71.707 0.7142
C y = 0.957x + 72.531 0.5754
D y = 1.0229x + 79.793 0.6646
0
20
40
60
80
100
120
140
HB VT VB HT FB FT
AMT ( )
0
20
40
60
80
100
120
140
HT VT HB VB FT FB
BMT ( )
0
20
40
60
80
100
120
VT HB HT FB FT VB
CMT ( )
0
20
40
60
80
100
120
140
HB VT HT FT FB VB
DMT ( )
-
. . 2556 16-18 2556
x R2
0.5469 ID x HB x 8.13, VT x
9.22, HT x 16.71, VT x 23.64, FB x 24.69, FT
x 26.95 9
9 ID
ID 8 A
ID
(Slope) 4 0.8855 B
ID Slope
1.0979 11.
ID
Quantity Fitts
ID
ID 4
ID
ID
Fitts
[1] Fitts, P. M. (1954). The information capacity of the human
motor system in controlling the amplitude of movement. Experimental
Psychology, 47:381-391
[2] Mackenzie, I.S., 1992. Fitts Law as Research and Design Tool
in Human-Computer Interaction. Human-Computer Interaction, 7:
91-139 [3] Thomas, C., and Milan, S. 1987. Which input
device should be used with interactive video. Human-Computer
Interaction: 587-592.
[4] Card, S. K., English, W. K., and Burr, B. J. 1978.Evaluation
of mouse,rate-controlled isometric joystick, step keys, and text
keys for text selection on a CRT. Ergonomic, 21: 601-613 [5] .
2555. . . [6] . 2555. . .
70
80
90
100
110
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30
(A) (B) (C) (D)
MT ( )
ID
HB VT HT VB FB FT
-
. . 2556 16-18 2556
[7] . 2554. . .
