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n J
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f
E
lect
rica
l En
g
ineering
a
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Co
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p
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t
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Science
Vo
l.
10
,
No
.
2
,
May
201
8
,
p
p
.
4
6
9
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SS
N:
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K
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In
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C
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A
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m
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n
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@
g
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ai
l.c
o
m
1.
I
NT
RO
D
UCT
I
O
N
T
h
e
in
v
en
t
io
n
o
f
p
iezo
elec
tr
ic
f
an
is
to
r
ep
lace
cu
r
r
en
t
r
ad
ial/ax
ial
f
a
n
s
[
1
]
b
y
r
ed
u
c
in
g
p
o
w
er
co
n
s
u
m
p
tio
n
w
it
h
n
o
is
e
f
r
ee
an
d
lo
n
g
li
f
e.
I
t
is
ca
l
led
a
f
an
b
ec
au
s
e
t
h
e
m
ai
n
p
u
r
p
o
s
e
is
to
r
ed
u
ce
te
m
p
er
atu
r
e
b
y
i
n
cr
ea
s
i
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g
t
h
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air
cir
cu
latio
n
i
n
th
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ar
ea
ar
o
u
n
d
th
e
f
a
n
tip
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f
t
h
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b
lad
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w
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e
o
th
er
w
i
s
e
i
n
s
tag
n
a
n
t
s
tate
[
2
]
.
T
h
e
p
iezo
elec
tr
ic
f
a
n
i
s
s
aid
to
b
e
lo
n
g
lif
e
b
ec
a
u
s
e
it
i
s
n
o
t
u
s
i
n
g
b
ea
r
in
g
as
e
x
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s
ted
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n
r
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ial
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an
s
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Usa
g
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all
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ld
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ad
e
f
a
n
e
f
f
icien
c
y
d
u
e
to
f
r
ict
io
n
f
o
r
ce
[
3
]
.
C
u
r
r
en
t
r
ap
id
th
er
m
a
l
m
an
a
g
e
m
en
t
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m
en
t
o
f
m
a
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y
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ac
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ca
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s
e
s
air
-
co
o
li
n
g
n
at
u
r
al
co
n
v
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tio
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to
b
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i
n
s
u
f
f
ic
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t
to
en
co
u
n
ter
t
h
e
h
ea
t d
is
s
ip
ati
o
n
f
r
o
m
t
h
e
elec
tr
o
n
ic
d
ev
ice
s
.
Hea
t
tr
an
s
f
er
en
h
a
n
ce
m
en
t
u
s
in
g
p
iezo
elec
tr
ic
f
a
n
f
a
l
ls
u
n
d
er
h
ig
h
a
m
p
li
tu
d
e
v
ib
r
ato
r
y
m
o
tio
n
o
f
co
o
lin
g
tec
h
n
iq
u
e
[
4
]
.
T
h
e
m
ain
co
n
ce
p
t
i
s
t
h
e
o
s
cillat
io
n
o
f
f
le
x
ib
le
p
iezo
elec
tr
ic
f
an
w
il
l
ca
u
s
e
m
o
tio
n
o
f
air
s
u
r
r
o
u
n
d
i
n
g
t
h
e
b
lad
e/f
an
w
h
ic
h
r
esu
lt
s
in
i
m
p
r
o
v
in
g
h
e
at
tr
an
s
f
er
co
ef
f
icie
n
t
an
d
h
ea
t
tr
an
s
f
er
r
ates.
A
n
Evaluation Warning : The document was created with Spire.PDF for Python.
I
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N
:
2
5
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2
-
4752
I
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J
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&
C
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Sci,
Vo
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10
,
No
.
2
,
Ma
y
2
0
1
8
:
4
6
9
–
4
7
9
470
alter
n
ati
n
g
i
n
p
u
t
cu
r
r
en
t
(
AC
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ca
u
s
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th
e
p
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tr
ic
f
an
t
o
co
n
tr
ac
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an
d
ex
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d
[
5
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T
h
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s
cillatio
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o
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th
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ca
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s
es t
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e
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A
f
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n
d
am
en
tal
p
iezo
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tr
ic
f
an
is
s
h
o
w
n
i
n
Fig
.
5
.
T
h
e
o
s
cillatio
n
o
f
t
h
e
b
lad
e
w
il
l
b
e
at
m
a
x
i
m
u
m
w
h
e
n
t
h
e
f
r
eq
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e
n
c
y
is
at
r
eso
n
a
n
ce
[
6
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-
[
1
0
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w
h
ic
h
is
in
f
l
u
en
ce
d
b
y
m
u
l
tip
le
f
ac
to
r
s
.
T
o
f
u
r
th
er
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m
p
r
o
v
e
t
h
e
b
lad
e
o
s
cillatio
n
,
ad
d
itio
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lad
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is
attac
h
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th
e
p
iezo
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tr
ic
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a
n
,
s
o
th
at
it i
s
b
en
d
in
g
as a
b
i
m
etallic
s
tr
ip
[
1
1
]
.
A
s
in
g
le
p
iezo
elec
tr
ic
f
a
n
w
i
ll
o
n
l
y
a
f
f
ec
t
a
s
m
all
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2
Mo
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m
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en
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est
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n
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s
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3
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3
.
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A
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r
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y
Or
ien
tatio
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Evaluation Warning : The document was created with Spire.PDF for Python.
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d
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N:
2502
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Hig
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.
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g
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4
.
T
h
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p
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it
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g
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if
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ap
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u
r
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4
.
L
o
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tio
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g
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t
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iezo
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tr
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ab
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3
.
Dif
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ase
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.
4
.
P
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s
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m
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u
,
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
5
0
2
-
4752
I
n
d
o
n
esia
n
J
E
lec
E
n
g
&
C
o
m
p
Sci,
Vo
l.
10
,
No
.
2
,
Ma
y
2
0
1
8
:
4
6
9
–
4
7
9
474
=
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(
1
5
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al
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.
3.
RE
SU
L
T
S
A
ND
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AL
Y
SI
S
3
.
1
.
Sig
nifica
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6
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Evaluation Warning : The document was created with Spire.PDF for Python.
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Evaluation Warning : The document was created with Spire.PDF for Python.
I
n
d
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n
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n
J
E
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E
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g
&
C
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m
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Sci
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N:
2502
-
4752
Hig
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