TELKOM
NIKA Indonesia
n
Journal of
Electrical En
gineering
Vol.12, No.6, Jun
e
201
4, pp. 4491 ~ 4
4
9
9
DOI: 10.115
9
1
/telkomni
ka.
v
12i6.548
8
4491
Re
cei
v
ed
De
cem
ber 2
4
, 2013; Re
vi
sed
Febr
uary 21,
2014; Accept
ed March 6, 2
014
Test Data Analysis on Voltage Regulation of Proportion
Relief Valve
Pei Weichi*, Cao Fu
kai, Zhao Shuzho
ng
Heb
e
i Un
ited U
n
iversit
y
46
Xin
h
u
a
Roa
d
,
T
angsha
n 0
630
09, He
bei,
Chin
a T
e
l: +
86031
52
592
16
6
*Corres
p
o
ndi
n
g
author, e-ma
i
l
:
w
h
ich
_pa
y@
163.com
A
b
st
r
a
ct
T
he mi
niat
ure
reform des
ig
n w
a
s to imp
r
ove
the volta
ge reg
u
lati
on
of regul
ar val
v
e and
prop
ortion
al v
a
lve. La
bVIEW
w
a
s used to
d
e
vel
op C
A
T
vo
ltage r
e
g
u
lati
o
n
of pr
oporti
on
reli
ef valv
e w
i
th
electro hy
drau
l
i
c prop
ortion
al
control an
d vi
sual i
n
stru
men
t. T
he content of t
he pressu
re adj
ustment of
prop
ortion
al r
e
lief va
lve
w
a
s intro
duce
d
fr
om diffe
r
ent a
ngl
es a
nd t
h
e
steady-state.
T
e
st on v
o
lt
ag
e
regu
latio
n
of pr
oporti
on rel
i
ef
valve w
a
s an
al
y
z
e
d
. T
he sa
mplin
g dat
a w
e
re process
ed a
nd an
aly
z
e
d
o
n
a
time
d
o
m
ai
n a
nd
fre
q
u
ency d
o
mai
n
b
a
sis. R
e
late
d
c
oncl
u
si
ons are mad
e
by
a
nalys
is on
curre
nt
li
ne
arit
y,
steady-state pr
essure, an
d pr
essure-
adj
ustin
g
del
ay.
Systematic
methods
and refe
r
ence
s
are provi
d
e
d
f
o
r
the deve
l
o
p
m
e
n
t of other valv
es to improve t
he
functio
n
an
d the system of
proporti
on
al valve.
Ke
y
w
ords
: pro
portio
n
reli
ef valve, volta
ge re
gul
ation, L
abVI
E
W
,
CAT
Copy
right
©
2014 In
stitu
t
e o
f
Ad
van
ced
En
g
i
n
eerin
g and
Scien
ce. All
rig
h
t
s reser
ve
d
.
1. Introduc
tion
As on
e of the
most im
po
rtant control
co
mpone
nts i
n
hydrauli
c
circuit, the main
function
of relief valve is to adjust the pre
s
sure of hydraul
i
c
circuit [1]. By u
s
ing the test
system an
d CAT
on voltage re
gulation of proportio
n
relie
f valve,
the content of voltage re
gulatio
n on pro
porti
on
relief valve was sel
e
cte
d
to analyze the
data on a time domain a
nd frequ
en
cy domain ba
si
s in
orde
r to
get t
he
result of
voltage regul
ation, del
ayin
g an
d p
r
e
c
isi
on, all
of whi
c
h
ca
n p
r
ovi
de
referen
c
e
s
for manufa
c
tu
rers to p
r
od
u
c
e p
r
opo
rtion
a
l valve [2,
3], and provi
de guid
a
n
c
e
for
manufa
c
turers to enh
an
ce
the quality a
nd fun
c
tion o
f
propo
rtional
valve. It is
also h
e
lpful f
o
r
use
r
s to u
s
e
prop
ortion
al
valve better and to
achi
eve better d
e
velopme
n
t and ap
plication of
electro-hydra
u
lic propo
rtio
n. Referen
c
e
s
ca
n
also be provid
ed
for other e
l
ectro
-
hyd
r
aul
ic
prop
ortio
nal valves.
2. Design an
d Inno
v
a
tion Plan of Test Platform
In ord
e
r to
achieve the te
st req
u
irem
ents about
p
r
o
portion relief valv
e in the exp
e
riment,
a spe
c
ial h
a
r
dware syste
m
wa
s req
u
i
r
ed to te
st t
he voltage regulatio
n [4]. The hydra
u
lic
prin
ciple
s
sho
w
n a
s
Figu
re
1.
To test
pilote
d propo
rtion
relief valve,
the ra
nge
of p
r
essure valu
e
wa
s 0
～
10 M
P
a and
the moving speed of hyd
r
aulic
cylinde
r on a test
ri
g
was
0.02
~0.
05m/s. Th
e p
r
opo
rtion
reli
e
f
valve in the
experi
m
ent
sh
ould
be
controlled
un
der
no
rmal
pre
s
sure a
n
d lo
w di
sch
a
rge.
Acco
rdi
ng to
the p
r
ima
r
y p
a
ram
e
ter, th
e
high
es
t
pressure
wa
s
set
up a
s
6MPa,
and th
e
highe
st
flow rate was
10
～
20
L/mi
n. The origin
al relief valve and pre
ssure ga
uge
s were repl
ace
d
by
piloted propo
rtion relief valve and pressu
re se
n
s
o
r
accordin
g to QCS003B. See Figure 2.
Evaluation Warning : The document was created with Spire.PDF for Python.
ISSN: 23
02-4
046
TELKOM
NI
KA
Vol. 12, No. 6, June 20
14: 4491 – 4
499
4492
Figure 1. Sch
e
matic Di
ag
ram of Hydra
u
lic System
Figure 2. Ref
o
rm Desi
gn Diagra
m
of Pre
s
sure Ad
j
u
st
ment Platform of Proporti
onal Relief Valve
3. CAT o
f
Pressur
e
Adju
stmen
t
Platform of Prop
ortional Relief Valv
e
Combi
ned
with virtual tech
niqu
es, the adju
s
tme
n
t platform
wa
s esta
blished a
comp
uteri
z
e
d
system with data colle
ctio
n and ele
c
tric system. The target and th
e pro
c
e
ss we
re
controlled
by digital
comp
uter a
nd the
data colle
ct
io
n of pa
ram
e
ter
su
ch a
s
p
r
essure a
nd fl
ow
were processed so that the
test can
be a
c
hieve
d
qui
ckly and pre
c
isely [5, 6].
3.1. The Desi
gn and Mod
e
l of Hard
w
a
re Sy
stem
As the
pressure
value
fro
m
the valve
port i
n
the
te
st shoul
d b
e
mea
s
u
r
ed,
diffusion
silicon pressu
re se
nsor
HG
2000
wa
s sel
e
cted o
n
t
he basi
s
of the requireme
nt for hardware a
n
d
measurement
pre
c
isi
on. During th
e dat
a colle
cti
on,
the pre
s
sure
sho
u
ld not
be collecte
d
too
fast. Con
s
ide
r
ing both
pre
c
isi
on an
d cost, dat
a coll
ection
ca
rd
PCI-91
12 wa
s ch
osen fro
m
ADLINK compatible with LabVIEW [7].
To re
alize th
e switch
of I/V from 4
～～
2
0
m
A to 0
+
5V, circuit am
plification
wa
s
desi
gne
d
to be compact size, stabl
e perform
ance,
low power
cons
um
ption and extensibility
.
See Figure
3.
LM324
ampli
f
ier, pre
c
isi
o
n
resi
stor
and
capa
cito
r were d
e
si
gned
for switch a
d
justin
g
board, whi
c
h
ca
n be use
d
to amplify sign
al,
filter
noise a
n
d
switch
I /V fro
m
the
sig
nal
from
p
r
es
su
re
s
ens
o
r
.
Evaluation Warning : The document was created with Spire.PDF for Python.
TELKOM
NIKA
ISSN:
2302-4
046
Test Data Analysis o
n
Voltage Regulati
on
of Propo
rtion Reli
ef Valve (Pei
Wei
c
hi)
4493
Figure 3. Sch
e
matic Pictu
r
e of I/V Circui
t Switch and
Amplification
3.2. Soft
w
a
r
e
Sy
stem De
sign
Software te
st
platform with
virtual instru
ment wa
s d
e
s
ign
ed by u
s
i
ng rel
a
ted p
r
ogra
m
ing
softwa
r
e, and
CAT can b
e
used to the test re
qui
rem
ent su
ch a
s
items, content
s and met
h
o
d
s,
whi
c
h
can
proce
s
s the
dat
a from th
e
co
ntrolled,
and
test an
d cont
rol b
o
th the
steady-state
a
nd
transi
ent process if the
rela
ted output informatio
n wa
s set in advan
ce [8].
Figure 4. Flow Dia
g
ra
m of Modula
r
ization De
sig
n
LabVIEW
wa
s u
s
ed
to d
e
sign an
d p
r
og
ram ‘Te
s
t mo
d
u
larity’, whi
c
h
ca
n divide th
e main
prog
ram i
n
to
four
sub
-
mo
dule
s
such a
s
test, contro
l, data coll
ection and
dat
a analy
s
is. S
e
e
Figure 4.
1) In the main prog
ram, first, the monit
o
ring
a
nd the
signal inp
u
t of the test point and
were set, and
reflux control
l
er wa
s ad
de
d to moni
tor the flow rate from the hydra
u
lic platform
2) Se
con
d
, two wave
controllers
were a
dded
to
be
co
nne
cted
with
the entran
c
e
of every
modula
r
p
r
og
ram
so th
at the re
gula
r
hyd
r
auli
c
te
st ca
n be d
one,
an
d the no
rmal
pump
and val
v
e
can be controlled
(pre
ssu
r
e
from adju
s
tment
pla
tform and the fl
ow
can
be m
onitore
d)
with
out
the enga
gem
ent of the pro
portion
al relie
f valve.
Evaluation Warning : The document was created with Spire.PDF for Python.
ISSN: 23
02-4
046
TELKOM
NI
KA
Vol. 12, No. 6, June 20
14: 4491 – 4
499
4494
3) The th
ree
tests for
ste
ady-state, dy
namic
re
spo
n
se a
nd p
r
e
s
sure adj
ustin
g
delay,
and data coll
ection an
d di
gital filter loading we
re de
sign
ed as
su
b-mo
dule
s
, and we
re set i
n
the
front main bo
ard a
s
button
s
so a
s
to coll
ect data by pressing the b
u
ttons.
4) Data
re
cord, data pre
s
e
r
vation, re
cord displayin
g
and re
sult pri
n
ting we
re d
e
sig
n
e
d
as the
seco
nd level m
o
dule by u
s
in
g the butto
n
cont
rol
so
as to
reali
z
e
the re
co
rdi
ng,
pre
s
e
r
vation
and pri
n
ting o
f
the data.
5) Fa
ult alarming si
gnal
wa
s set in the pro
g
ra
m int
e
rface by u
s
i
ng the uni
qu
e pro
g
ra
m
fault system
to stop the
susp
end
featu
r
e. Wh
en the
r
e is
som
e
thi
ng wron
g wit
h
the hydra
u
l
i
c
system, data
coll
ectio
n
card
or software
pr
og
ram
m
ing
system
,the program
will
be
sto
p
ped
immediately [9, 10].
4. Test
and
Data Analy
s
is on Refo
rm Design
of Pres
sure
Adjus
t
ment of Propor
ti
onal
Relief Valv
e
Pilot type ele
c
tro
-
hydrauli
c
prop
ortio
nal
re
lief valve DBE10-30B
-10
0
YM wa
s
ch
ose
n
a
s
the test obje
c
t can be a
c
co
rded
with any
feature of no
rmal valves.
4.1. Stead
y
-
state Con
t
rol
Pressur
e
– Current Lin
e
a
r
it
y
Test and
Data
Analy
s
is
The be
st way to measure the
perf
o
rma
n
ce
an
d the pressure a
d
ju
stment of a
prop
ortio
nal relief valve is t
o
test the lin
e
a
rity
, the feature of th
e pre
s
sure
output
and the
cu
rre
n
t
input u
nde
r t
he n
o
rm
al hy
drauli
c
syste
m
co
nditi
on.
The p
r
e
s
sure
adju
s
tment
can
be te
ste
d
by
analyzi
ng the
linearity of the valve.
1) Te
st Meth
ods
(1) A
s
the hy
drauli
c
syste
m
wa
s wo
rkin
g unde
r lo
w p
r
essu
re a
nd
small flow, the
highe
s
t
pre
s
sure of the propo
rtion
a
l relief valve
shoul
d
be 6
M
Pa and the
effective con
t
rol of the inp
u
t
curre
n
t sign
al
for the prop
o
r
tional control
amplifier was 400mA.
(2) Afte
r the
pre
s
sure va
lve wa
s reco
rded,
a
current
sig
nal was sent between
the
starting
curre
n
t
sig
nal
and
the rated
current si
gn
al
of the
p
r
op
ortional
am
pl
ifier. Repe
at
the
pro
c
e
ss and measure
the pre
s
sure
of
e
a
ch cu
rrent
value
while th
e pro
p
o
r
tiona
l relief valve
wa
s
workin
g stea
dy-state, re
co
rd the com
p
le
te cycle of P
－
I curve com
posed of posi
t
ive sample a
n
d
negative sam
p
le.
(3) Co
mbin
e
d
with
cu
rve
s
, a g
r
ou
p o
f
data was
colle
cted
accordin
g to the
above
pro
c
e
ss, an
d the linearity curve of stead
y-stat
e pressure
-current can be an
alyzed and
comp
are
d
with the ideal
linearity of propo
rtion
a
l re
lief valve,
the
n
the linea
rity of pressu
re
adju
s
tment can
be co
ncl
ude
d
.
The analy
s
is
formula of ste
ady-state
con
t
rol for propo
rtional relief valve is:
%
5
.
3
%
100
linearity
max
A
L
(1)
In formula
max
L
--- The maxi
mum deviatio
n
betwe
en st
eady-s
tate co
ntrol curve an
d its best fitting
line
A
---- D-value o
f
the rated cu
rre
nt and initi
a
l curre
n
t
Becau
s
e
of t
he n
onlin
earit
y of initiation
of pr
essu
re a
d
justme
nt
for the
p
r
opo
rtio
nal relief
valve, the starting value
of linear current sho
u
ld b
e
set as the
lower d
ead
point by using
MATLAB to get the best fitting cu
rve thro
ugh
lea
s
t sq
u
a
re meth
od o
f
best app
roximation.
2) Ori
g
inal
Data and Calib
ration Analy
s
i
s
of Pressu
re
-cu
r
rent Te
st
A com
p
lete
cycle of li
nea
ri
ty of steady-state
co
ntrol
o
f
pre
s
sure-cu
rre
nt for
prop
ortional
relief valve b
y
using MAT
L
AB to get the best fitti
ng curve th
rou
g
h
three lea
s
t square metho
d
s of
best ap
proxi
m
ation. See Figure 5.
Evaluation Warning : The document was created with Spire.PDF for Python.
TELKOM
NIKA
ISSN:
2302-4
046
Test Data Analysis o
n
Voltage Regulati
on
of Propo
rtion Reli
ef Valve (Pei
Wei
c
hi)
4495
Figure 5. The
Linearity Cu
rve of
Steady-state Pre
s
sure-current
It is sho
w
e
d
in Figu
re 5 th
at pre
s
sure zero d
ead
zo
n
e
app
eared b
e
twee
n 0
～
10
0mA in
the propo
rtio
nal am
plifier,
and
no p
r
e
ssure
wa
s
sh
o
w
n
even the
curre
n
t drive
wa
s a
dded
to
th
e
prop
ortio
nal v
a
lve. It is su
g
geste
d that th
e area
s
h
ou
ld b
e
pa
ss
e
d
as
q
u
i
ck
ly as
po
ss
ib
le
.
W
h
en
the input
cu
rrent wa
s
100
～
250mA, the
pre
s
sure
sig
nal data
a
c
q
u
isition
point
wa
s fluct
uate
d
, it
is sh
owed tha
t
nonlinea
rity exists in the signal du
ring t
he pre
s
su
re a
d
justme
nt.
Table 1. Te
st Data of Pre
s
sure
-current Li
nearity
0
～
400mA
For
w
a
r
d sampling
test
(No.)
Input
signals
(mA)
Output p
r
essure
value
(mPa)
0
～
400mA
Rever
s
e sample
test
(No.)
Input
signals
(mA)
Output p
r
essure
value
(mPa)
1 0
0.00
1
400
5.67
2 25
0.00
2
380
5.20
3 50
0.00
3
350
4.75
4 75
0.00
4
330
4.46
5
100 0.10
5
300 4.21
6
125 0.20
6
290 4.11
7
150 0.40
7
260 2.97
8
175 1.07
8
240 2.66
9
200 1.50
9
215 2.20
10
225 2.00
10
200 1.55
11
250 2.80
11
180 1.70
12
275 3.50
12
170 1.25
13
300 3.97
13
150 0.60
14
325 4.20
14
135 0.37
15
350 4.66
15
100 0.10
16 375
4.90
16
50
0.05
17 400
5.51
17
0
0.00
The maxim
u
m derivatio
n
betwe
en
stea
dy-state
co
ntrol cu
rve a
nd
the be
st fitting line i
s
240
～
2
50mA,
and the data
and form
ula can be con
c
lu
ded from T
a
b
l
e 4 and Fo
rmula (1
).
%
5
.
3
%
5
.
2
%
100
0
400
240
250
%
100
linearity
max
A
L
It is showed f
r
om th
e ab
ove that the te
st
wa
s en
gag
e
d
un
der the
steady-state
condition
of prop
ortion
al relief valve
.
The linearit
y of pres
su
re
-cu
r
rent was
2.5%, which is less tha
n
the
stand
ard
line
a
rity erro
r 3.5
%
. It is al
so
showed th
at th
e pe
rforman
c
e of p
r
o
portio
nal relief valv
e
wa
s stable, a
nd
the
no
nlin
earity
e
rro
r was normal,
th
e de
sig
n
of th
e p
r
essu
re
a
d
justin
g pl
atform
w
a
s
re
as
o
nab
le
a
n
d
th
e ad
ju
s
t
men
t
pr
ec
is
io
n
w
a
s
c
o
r
r
e
c
t. T
h
e pr
op
o
r
tio
n
a
l
re
lief va
lve
c
a
n be
use
d
in a pra
c
tical
situatio
n with a
c
tual
data
and a
n
a
lysis to
correction e
r
ror
compen
satio
n
in
orde
r to bette
r improve the
perfo
rman
ce
of propo
rtion
a
l relief valve.
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Vol. 12, No. 6, June 20
14: 4491 – 4
499
4496
4.2. Stea
d
y
-
S
tate
Pre
s
s
u
re-Curr
e
nt Tes
t
Anal
y
s
is on Ti
me Dom
a
in and
Freq
u
e
nc
y
Spectr
u
m
a) Methods
The
pre
s
sure
load
in th
e h
y
drauli
c
cylin
der s
hould
b
e
kept to
be
1, the p
r
e
s
su
re i
n
the
prop
ortio
nal relief valve should be adj
u
s
ted to 5.5, and 400mA was add
ed to the pro
portio
n
a
l
amplifier.
The d
a
ta
wav
e
was
re
co
rd
ed by the
test
software
sy
stem, and th
e
cha
ngin
g
line
a
rity of
steady-state
pre
s
sure time domain wave wa
s analy
z
ed.
The data fro
m
the colle
cti
on ca
rd
wa
s anal
yzed by MATLAB. The frequ
en
cy spe
c
tru
m
wa
s prog
ram
ed, and the
F
FT wa
s e
nga
ged imm
ediat
el
y. To analy
z
e the
pro
portional reli
ef valve
unde
r the adj
ustment p
r
e
s
sure, and to
analyze the s
pectrum di
stri
bution of pre
s
sure
sig
nal
and
fluctuation, n
o
ise a
nd pressure fl
uctuati
on in the hydraulic
system.
b) Te
st Analysis
(1) Tim
e
Dom
a
in Analy
s
i
s
The
rate of
sampling
card
wa
s 40
960S/
s
throug
h p
o
int sam
p
ling. I
t
is sho
w
ed
i
n
Figu
re
6 that the time domai
n wave was
wi
thin 0.05s, a
nd the sa
mp
ling point
s were fro
m
178
88
to1999
1.
It is
sho
w
ed
from t
he Fi
gure
6
that t
he p
r
e
s
sure
curve
colle
cting from the
adju
s
ted
pre
s
sure val
ue of 5.5MP
a
in the
pro
portion
al
reli
ef valve wa
s not a line
a
r but a
curve
with
irre
gula
r
ity a
nd flu
c
tuatio
n, whi
c
h
su
gge
st
ed that
unde
r th
e
steady-state
load
co
ndit
i
on,
hydrauli
c
cyli
nder
woul
d p
r
odu
ce p
r
e
ssure di
stur
ban
ce to the pip
e
line sy
stem
to overcome
the
work lo
ad. An
d wh
at is m
o
re, the hydraul
ic cy
lin
der
wo
uld be
delaye
d
whil
e produ
cing
pre
s
su
re
disturban
ce
or d
e
layed
b
y
the extern
al di
stur
b
a
n
c
e. It can
be
se
en l
a
rg
e
fluctuation
in
the
sampli
ng of 1
8000, 18
800,
and 19
200 of
the curve tim
e
domain.
Figure 6. Analysis of Time
-domain
Wave
form
(2) Po
we
r Spectral
Den
s
ity-Freque
ncy A
nalysi
s
The math
em
atical inte
gral
of stable
ra
ndom
sign
al can
not
be co
nverge
d
ju
st as
the
spe
c
ific
statistical ave
r
ag
e value can
n
o
t be sh
o
w
e
d
the reflect
ed ran
dom signal as the
set
sign
als, a
s
a
result, functio
n
in the frequ
ency
d
o
main and
p
o
wer sp
ectral den
sity
function sh
o
u
ld
be u
s
ed to
sho
w
the av
erag
e spe
c
tral ch
ara
c
te
ristics. The p
u
rpo
s
e
of freque
ncy do
main
cha
r
a
c
teri
stics is to re
co
rd both FFT
function in t
he frequ
en
cy domain an
d
powe
r
spe
c
tral
den
sity function.
Spectrum d
e
n
sity wavefo
rm is th
e mo
st
impo
rtant
para
m
eter fo
r testin
g
stationary
rand
om si
gn
al and it can
clearly di
spl
a
y the dist
rib
u
tion of discrete stationa
ry random
sig
nal,
machi
ne or
fluid vibratio
n signal. Sp
ectru
m
den
sity waveform analysis i
s
easy to find
brea
kd
own, noise a
nd vibration pro
b
lem
during the o
p
e
ration.
The ene
rgy spectrum an
al
ysis in the time domai
n waveform data
acqui
sition p
o
int wa
s
see
n
in the
Pic 37
wh
en
the pressu
re
value was
5.5MPa. To te
st the a
c
tual
vibration
sign
al,
bilateral p
o
wer sp
ect
r
al d
ensity analysi
s
woul
d be u
s
ed in the M
A
TLAB time frequ
en
cy toolbox,
and it is sho
w
n in the Fi
gure 7 a
s
th
e Bilateral Spectrum, wh
ose
sampli
ng
frequen
cy was
200
Hz, only u
n
ilateral p
o
wer sp
ect
r
al de
nsity of 0
～
100Hz will be analyzed.
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TELKOM
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046
Test Data Analysis o
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Voltage Regulati
on
of Propo
rtion Reli
ef Valve (Pei
Wei
c
hi)
4497
Figure 7. Analysis G
r
aph of
Spectru
m
De
nsity Wavefo
rm
It is sho
w
ed
from th
e
cu
rve of p
o
wer spectral d
e
n
s
ity that within
the p
r
e
s
sure
sign
al o
f
finite sa
mplin
g poi
nt d
a
ta, the m
a
ximu
m spe
c
trum
pea
k
wa
s
at
10Hz, a
n
d
its amplitu
de
was
740; anoth
e
r
large
r
pe
ak
was at 50
Hz, and its amp
litu
de wa
s 50
0; the third larg
er pe
ak
wa
s at
80Hz, a
nd it
s am
plitude
wa
s 4
50, h
o
w
ever,
othe
r po
wer spe
c
tral de
nsity
were di
stri
bu
te
d
spa
r
sely, and
their amplitu
de wa
s bet
we
en 100 a
nd 4
00.
It is con
c
lud
e
d
from the ab
ove that unde
r the
low
pre
s
sure an
d sm
a
ll flow co
ndition, the
pre
s
sure fluctuation from
the pre
s
sure
adjustin
g
sy
stem of the
prop
ortio
nal relief valve was
focu
sed to
a
large
extent
on the lo
w
freque
ncy, a
nd vibratio
n
and lo
w-f
r
eq
uen
cy pre
ssure
pulsation were sho
w
e
d
in the hydra
u
lic
system
a
nd test syste
m
b
e
ca
use of disturban
ce.
4.3. Pressur
e
-adju
s
ting
Dela
y
Test
1) The
o
reti
cal
analysi
s
Hypothe
si
s t
e
st of
avera
g
e
differe
nce t
wa
s
eng
age
d with
the t
w
o di
screte
st
ationary
rand
om sequ
ences, an
d their n
o
rm
ality and inde
pen
den
ce were t
e
sted. Th
ere
is no
significant
differen
c
e bet
wee
n
sam
p
lin
g value and t
heoretical val
ue.
Relative a
nal
ysis
wa
s to d
e
scrib
e
whet
her li
nearity exis
ts
between two variables
.
In
a
broa
d
sen
s
e
,
two statio
nary rand
om
seq
uen
ce
)
(
n
x
and
)
(
n
y
,their cro
s
s correl
ation
coeffici
ent wa
s:
2
1
1
0
2
1
0
2
1
0
]
)
(
)
(
/[
)
(
)
(
N
n
N
n
N
n
xy
n
y
n
x
n
y
n
x
Z
(2)
To evaluate t
he rel
a
tive function of the t
w
o rand
om seque
nces, an
d observe the
chan
ge
dire
ction wh
e
t
her
p
o
sitive correl
ation,
n
egative
corre
l
ation o
r
zero correlation.
If the chan
g
e
dire
ction of
)
(
n
x
、
)
(
n
y
is th
e
sam
e
, the
coeffici
e
n
t co
rrelation
will
be
z>0;
and if th
e
ch
ange
dire
ction of
)
(
n
x
、
)
(
n
y
is th
e o
ppo
si
te, the coefficient correlatio
n will
be
z<0;
and
if there i
s
n
o
cha
nge di
re
ction of
)
(
n
x
、
)
(
n
y
, the
coeffici
ent correl
a
tion will be z=0.
Table 2. Mea
s
ureme
n
t Dat
e
s of Pre
s
sure-adj
ustin
g
Delay
Input curren
t
(mA)
Output p
r
essure
value
(mPa)
Dela
y
time
(s
)
0.100
0.10
0.056
0.150
0.40
0.061
0.175
1.07
0.060
0.200
1.50
0.054
0.225
2.00
0.049
0.250
2.80
0.050
0.275
3.50
0.051
0.300
3.97
0.037
0.375
4.90
0.053
0.400
5.51
0.047
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Vol. 12, No. 6, June 20
14: 4491 – 4
499
4498
2) Te
st analy
s
is
In the te
st,
a group
of
control
cu
rrent
sig
nal
s
were sent from
the compute
r
to the
prop
ortio
nal
relief valve, a
nd timing.
Ob
serve
the
current val
ue
an
d p
r
e
s
sure
value
and
record
and mo
nitor t
he time whe
n
ch
ang
es from the cu
rre
n
t input to th
e output of t
he pressu
re,
and
then analy
z
e
the two ran
d
o
m
numeri
c
al
seq
uen
ce
s.
The ori
g
inal d
a
ta of pre
ssu
re adju
s
ting d
e
lay test wa
s sho
w
n in Ta
b
l
e 2.
3) Visu
alization analy
s
is of
3D sp
ace
Visuali
z
ation
of 3D sp
ace, prog
rame
d
by MA
TLAB, can be
clea
rly and directly display the
internal
relati
ons b
e
twe
e
n
current in
put
, pressu
re o
u
t
put and pressure-adju
s
tin
g
delay into the
3D
sp
ace. It is
sho
w
e
d
in
Figu
re
8 tha
t
after the
op
eration
of th
e test
syste
m
, the p
r
e
s
sure
adju
s
tment of propo
rtional
relief valve was not
stabl
e
when the ini
t
ial current a
d
justme
nt wa
s
cha
ged, an
d becau
se the
overflow
wa
s not fully
finished when th
e hydra
u
lic p
u
mp was
started
with low pressure, the initial time for pressu
re adj
ust
m
ent wa
s del
ayed long
er,
however, whrn
the system
was op
erate
d
n
o
rmally, the p
r
essu
re a
d
ju
stment delay wa
s sh
orten
e
d
.
Figure 8. Visualization An
alysis of 3
D
Space
Figure 8
sho
w
s Visuali
z
ation a
nalysi
s
of 3D
spa
c
e
for the
cu
rrent i
m
put, pressu
re outp
u
t
and pressu
re
adju
s
tment d
e
lay.
It can be co
nclu
ded fro
m
the above
analysi
s
that
there a
r
e si
gnifica
nt cha
nge
s in
curre
n
t input
and p
r
e
s
sure
output in the
prop
ortio
nal
relief valve, a
nd the
coefficient co
rrelatio
n
is po
sitive, which
signifie
d
that the cha
nging
spe
ed
and the p
r
e
s
sure value
are in the sam
e
dire
ction
eve
r
y time in
th
e current
adj
ustment
sam
p
ling
point, a
nd the
p
r
essure
adju
s
tme
n
t
delay is short
at the speed
of ms, whi
c
h
can b
e
achie
v
ed within 10
0ms.
Some
current adjustment and
we
ak
pressure voltage f
o
llower
still
exist in the test, whi
c
h
sho
w
s that p
r
essure adj
ust
m
ent delay
e
x
ists in
the
proportio
nal
reli
ef valve duri
n
g the test, a
n
d
the p
r
oble
m
i
s
that
the
pul
sation
interf
e
r
en
ce
in th
e
hydrauli
c
system an
d el
ectromag
netic
and
noise distu
r
b
ance co
uld b
e
respon
sibl
e
for the nonlin
earity of the test re
sult.
4. Conclusio
n
The pressu
re
adjustin
g
de
lay platform of pr
oportional relief valve is a reform
of self-
desi
gn a
nd
st
udy with l
o
w-co
st combin
e
d
with
el
e
c
tro
hydra
u
lic
proportio
nal
co
ntrol a
nd visu
al
instru
ment of
CAT. The content
of the pre
s
sure a
d
justment of
prop
ortio
nal relief valve was
introdu
ce
d from differe
nt angle
s
a
nd t
he ste
ady-s
ta
te, dynamic
a
nd del
ay ch
a
r
acte
ri
stics in
the
pre
s
sure a
d
j
u
stment
we
re teste
d
a
n
d
analy
z
ed,
a
nd the
sampl
i
ng d
a
ta
were processe
d
and
analyzed
on
a time
domai
n an
d frequ
e
n
cy d
o
main
b
a
si
s, an
d the
referen
c
e
dat
a were a
c
q
u
ired
and the con
c
l
u
sio
n
of the pressu
re a
d
ju
stment
cha
r
a
c
teristi
cs we
re rea
c
he
d.
Referen
ces
[1]
Z
hang
Gong,
Yu L
a
n
y
i
ng. R
e
vie
w
a
nd D
e
velo
pm
ent T
r
end of E
l
ectro-
h
y
dr
au
lic Pro
p
o
r
tiona
l Va
lve
.
F
l
uid Mac
h
in
er
y
. 2008; 36(
8): 32-3
7
.
Evaluation Warning : The document was created with Spire.PDF for Python.
TELKOM
NIKA
ISSN:
2302-4
046
Test Data Analysis o
n
Voltage Regulati
on
of Propo
rtion Reli
ef Valve (Pei
Wei
c
hi)
4499
[2]
Z
eng Yis
h
a
n
, Xi
a Yo
ngs
hen
g. Deve
lo
pme
n
t of H
y
dra
u
l
i
c
CAT
Compre
hens
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x
peri
m
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able
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ne Mac
h
in
ery
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[3]
Z
heng
Sh
eng
li.
Reform
of El
e
c
tronic C
ontro
l
S
y
st
em of
Det
a
cha
b
le
H
y
dr
a
u
lic E
x
per
imen
tal Pl
atform.
Coal Mi
ne Mac
h
in
ery
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6; 27(3): 126-
12
7.
[4]
Z
hang
Yu
nan.
App
licati
o
n
of
Prop
ortion
V
a
lve
of Overfl
o
w
in
g
Devic
e
Used
in
H
y
dr
a
u
lic Pr
essur
e
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C
o
al
Te
ch
no
l
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g
y
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2
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[5]
Hu Junk
e, He Guohu
a. Desi
g
n
on the Perfo
rm
ance T
e
st Exp
e
rime
nt Platform of the Hig
h Pressur
e
and Bi
g F
l
o
w
P
r
oporti
ona
l Dir
ection
al Valv
es
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Machine T
o
o
l
& Hydraul
ics
. 200
6; 1(1): 94-
95.
[6]
Yao C
h
e
n
g
y
u,
Z
hao J
i
n
g
y
i.
Desig
n
and
P
r
actice o
n
E
l
e
c
trical C
ontro
l
an
d Hy
drau
li
c Systems
of
Hydra
u
lic Stati
on of T
e
st-bed.
Machin
e T
ool
& Hydrau
lics.
2
010; 38(
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48.
[7]
Yan Ji
do
ng, Y
ang Z
h
ih
on
g. D
y
namic
testin
g s
y
stem a
nd
i
t
s data transm
i
ssion for
QCS
003
h
y
dr
aul
ic
exper
imenta
l
pl
atform.
Chines
e Journ
a
l of Co
nstruct Ion Machin
ery.
200
7; 5(2): 220-
22
3.
[8]
Pan W
e
i, Che
n
Guiming. T
he
Appl
icatio
n of Virt
ual Instrum
ent T
e
chniqu
e in H
y
dra
u
lic M
easur
ements.
Machi
ne T
ool
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2
001; 3(3): 1
23-
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[9]
Jian
g Cha
o
, Xu W
ubin. Des
i
gn of Inst
rume
nt Control S
y
s
t
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OMNIKA
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esi
an Jou
r
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[10]
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an
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ao. A Rapi
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y
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a
sed o
n
La
b
V
IEW
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u
ter
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E
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esi
an Jou
r
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