Tiêu chuẩn iso 07574 4 1985 scan

Infor mation is in lu e to a sist th labeler parameters.. variable for perc nt defetve... tion of th nois emis ionv lu s of th batc s al le.. This prin- ciple is ap ro riate for ma s-pro

INTENATIONL OR AIZ ATI N FOR STAN ADIZ ATI N*MEXAYAO nHAR OPTAU3AU flO CTAflATU3AU O R GAlsnTloN INTENATIO NAL E D NORMAL ISATION

Aco stq e - Mk oe statstq e p ur la d& terminato et ie co tr6ie de valeurs d& lar& es d’hmis io ao stqe de

ma hine et Bq ipements - Parte 4 : Mk o e p ur valeurs d& larbe de lots de ma hine

i

8

‘

Y

Decriptors : ao stic , ma hin ry, n is (s u d), statistic l q alty c ntol statisticl a aly is

R

R

s:

IS0 (h Intern tion l Org niz tion for Sta d rdiz tion) is a w orldw id fe eration of

n tion l sta d r ds b die (IS0 member b die ) Th w ork of preparin Intern tion l

Sta d r ds is normaly c rr ie out throu h IS0 te h ic l commite s Ea h member

b d intere te in a s bje t for w hic a te h ic l commite h s be n e tabls e h s

th rig t to be repre e te on th t commite Intern tion l org niz tion , gov rn-

me tal a d non-gov rnme tal, in laison w ith ISO, also take par in th w ork

Draf t Intern tion l Sta d rd a o te by th te h ic l commite s ar e circ late to

th member b die for ap rov l befor e th ir a c pta c a Intern tion l Sta d rd by

th IS0 Cou ci Th y ar e ap rov d in a cord n e w ith IS0 proc d r es re uirin at

Intern tion l Sta d rd IS0 7 7 /4 was prepar ed by T ec nic l Commite ISO/ T C 4 ,

Aco stc

Us r s s ould note th t al Inter nation l Sta d rd u d rgo re ision fom time to time

a d th t a y refere c ma e h r ein to a y oth r Inter nation l Sta d rd imple its

late t e ition, u le s oth rw is state

0 Internatio al Organiz tio for Stan ardiz tio , 19 5 0

Pr inte in Sw itz rla d

i

0 Intod ction 1

1 Sco e a d field of ap lc tion 1

2 Refere c s 1

3 Definition

1 4 Ge eral 1

5 Guid ln s for th d termin tion of th labele v lu , L, by th labeler 2 6 Verifyin th labele v lu for a batc of ma hin s 3

6.1 Ge eral 3

6.2 Sin le s mpln in pe tion 3

6.3 Double s mpln in pe tion 4 6.4 Se u ntial s mpln in pe tion 4

7 Information to be giv n in a spe if i label n cod for a spe ific famiy ofma hin s 5

A nn x es A Oper atin c ara ter istic c rv s a d e ample of sin le, double a d s q e tial s mpln 6

B Guid ln s for e timatin sta d rd d viation a d for th u e of o eratin c ara ter istic c rv s 9

C Listofsy mb ls

14

Biblography 14

I

Acoustics

A g n ral intod ction to th fourpar s rie of IS0 7 7 is

giv n in IS0 7 7 /l

F r th purp s s of this par of IS0 7 7 , th ter m “labele

v lu ” sta d for al k in s of state v lu (e.g information on a

label, th up er nois lmit s t by a a thority, th a re d con-

ta t v lu ) for whic th method ma be ap le

T his par of IS0 7 7 contain statistic l s mpln method for

c e k in th state nois emis ion v lu s for batc e (lots) of

c e k ed by s mpln proc d re A r efere c sta d rd d via-

spe ific famiy of ma hin s In a dition, information on th

type of s mpln to be u e (sin le, double or s q e tial) a d

th s mple siz is re uir ed Th proc d re spe if i d in this

par of IS0 7 7 a s me th t th nois emis ion v lu s of a

batc (lot) of ma hin s w il f olow a normal distibution Th

statistic l parameter s up n w hic this par of IS0 7 7 is ba e

a s me th t th re is a 9 % pro abi ty of a c pta c if no

more th n 6,5 % of th nois emis ionv lu s in a batc ex ce d

th labele v lu Infor mation is in lu e to a sist th labeler

parameters

T he method giv n in this par of IS0 7 7 e s re th t a batc

(lot) of ma hin s labele in a cord n e w ith th spe ific tion

f or th v rific tion proc d re h v a pre eter min d pro abi ty

of a c pta c

This par of IS0 7 7 provid s g id ln s for d ter minin th

labele v lu , L, by th labeler a d spe if i s statistic ls mpl-

of a batc (lot) of ma hin ry a d e uipme t w ith its labele

v lu

This par of IS0 7 7 is inte d d to a sist thos parie r esp n-

sible for dr aw in up spe if i label n cod s for spe if i fami e

of ma hin s It is also inte d d to be of u e to labeler s w ho

w ant th ir batc e of ma hin s to conform w ith v rific tion

proc d re th t ar e in a cord n e w ith th spe ific tion giv n

in th spe if i label n cod s ba e on cla s 7

This par of IS0 7 7 doe not d al w ith th con e u n e th t

e s e if th state v lu is not confir me a v rifie for a batc

(lot) of ma hin s

variable for perc nt defetve

IS0 4 71, Aco stc - Nois labeln ofma hinery an eq ip-

ment

IS0 774f 1, Aco stc - Statstc l meth ds for determinin

eqipment - Part I General co siderato s an definio s

F r th pur pos s of this par of IS0 7 7 , th d finition giv n

in IS0 7 7 /l ap ly

F r a batc of ma hin s, th nois emis ion v lu s wil cov r a

c rain ra g d e to th v riabi ty betw ee th ma hin s (el-

e a t me s re: sta d rd d viation of prod ction, a, a d d e

to me s r eme t erors oc urin u d r reprod cibi ty con i-

tion (ele a t me s r e: sta d rd d viation of reprod cibi ty ,

v ariabi ty is th total sta d rd d viation, ct

T he aim of label n a batc of ma hin s is to in ic te a

labele v lu , L, a lmit below whic a spe ifie larg pro or

1

tion of th nois emis ionv lu s of th batc s al le L, is ex -

pre s d a a inte er in d cibels

w ith th labele v lu , this par IS0 7 7 w or k s on th prin-

ciple th t only a s mple fom th batc is me s r ed This prin-

ciple is ap ro riate for ma s-prod c d ma hin s This par of

IS0 7 7 con id rs th n e to contol ma hin s whic are to

nois compare w ith th labele v lu ; th refore, it ap le to

on -sid d c s s for c e kin a up er lmit, not to tw o-sid d

c s s w hic w ould also e clu e ma hin s w hic are to q iet

Th prin iple is ba e on bala cin r isk s whic ar e e pre s d

by a pair of v lu s: a spe ifie pro orion, p1-@, of nois emis-

spe if i d pro abi ty of reje tion, a , for a lot w ith this pro or

tionp1_ a

Verifyin compla c of th lot w ith th labele v lu is ba e

It s ould be note th t fixin a a dp1-a r es lts in al o eratin

c ar acteristic c rv s (OCs) inters ctin at th prod c r’s risk

p int

If th a tu l total sta d r d d viation is difere t fom th

refer en e sta d r d d viation oM, g id n e for th labeler is

giv n in cla s 5 a d a n x B

NOT E - In th ap lc tion of this p r of IS0 7 57, it is as me th t

al mes reme ts wi b p rorme b a te tin la oratory whic hs

a pro riate te t fa i tie a d tain d staf

ma hin s is th sole re p n ibi ty f th labeler, this cla s is

giv n for g id n e only to provid a pr edictable pro abi ty of

a c pta c

a) th t th nois emis ion v lu s of th batc ap roximate

to a normal distibution, c ara teriz d by th me n v lu p

a d th spe if i d refere c sta d r d d viation oM; a d

b) th t th reje tion pro abi ty for a batc is e u l to a

spe ifie v lu a if th labele v lu L, is c os n so th t

th pro orion of nois emis ion v lu s of th batc e -

c e in L, is e u l to th spe ifie v lu p, _ a

Proc d r es in this par of IS0 7 7 ar e ba e on a = 5 % a d

plma = 6,5 %

ex ists [s e, in paric lar, 7 c) to f)l

A r ea on bly lar ge n mber of me s r ed v lu s of in ivid al

ma hin s, Lz ar e d termin d in a cord n e w ith th spe if i

L, c n only be d ter min d in a cor da c w ith this par of

me s r eme t te t cod for th spe if i famiy of ma hin s

(Th a ter isk in th sy mb ls is u e h re to difere tiate be- IS0 7 7 if a spe ific label n cod in conformity with cla s 7

tw ee me s reme ts in conformity w ith this cla s a d thos

in conformity w ith cla s 6.1

NOT E - T he fix d v lu of 6,5 % w as co e in ord r

-

to c mply with th d finitio for L ;

-

to mak e s r e th t th difere c b tw ee L a d th

me n for

th b tc is res n bly lmite ; ad

-

to ahie e a c m o u d rsta din , c mp ra i ty ad c m-

p tibi ty of difere t L vlus for difere t ma hin s fom difere t

fami e of ma hin s

If th batc a d th labele v lu , L, confor m w ith th s

v alu s, th s mpln in pe tion pr oc d re ar e s t in s c a

1- a = 9 % a d th me n v lu w il be ex pe te to le ap-

proximately 1,5 oM below th labele v lu

NOT ES

1 If it is eplcitly k own th t a state v lu is n t a u p r vlu a s

L c b t reree ts a me n v lu (whic is n t in ac r da c with

1.5 ol\n to this me n v lu to o tain Cc

2 Meth d for e timatin ris fa tors ar e givn in a n x es A a d B;

th y ma b re lae b re ete , simulate a plctio of th ce k-

in pro eure u in a tu l mes reme t d ta, if th a s mptio th t

distib tio is u crain Normalty tets wi b d sribd in a future

Intern tio al Sta d rd

mahin s, a s d s rib d in this p r of IS0 77, bro dly c nforms to

IS0 351 whic is, h weer, d sig e for th in p ctio of b tc e

fom c ntin o s pro u tio IS0 351 d e n t pro id for d u le a d

sq e tial s mpln in p ctio , ad th o eratin c ara teristic c rv s

d n t intersct ea tly at th pro u er’s ris p int; this is, how ev r,

th aim of this p r of IS0 77 with th view to eta ls in th men-

in of L u ambig o sly

Th me n v lu , t, a d th total sta d rd d viation, sr are

ma hin s in a s mple (s e also cla s 8.2)

z* a d sr are e timate of th me n v lu *u a d th total sta -

d rd d viation, or, of th batc to be labele

In a cor da c w ith cla s B.3, e u tion ( 61, th folow in

e u tion w il provid g id n e for th labeler w ho wants to

h v a pro abi ty of a c pta c , P, d fin d by hims lf :

upa

L, = ,U + kCJp,j + -O t

J;i

w her e

foror f bM (2)

,u is th me n v lu of th batc ;

n is th spe ifie v rific tion s mple siz for sin le s m-

pln in pe tion (6.2) or th e uiv le t sin le s mple siz in

th c s of double s mpln in pe tion (s e 6.3) or s q e -

tial s mpln in pe tion (s e 6.4)

k is a fu ction of n, in a cor da c w ith table 1;

upa

is th q a tie of th normal distibution for th v lu

P, (s e table 7)

v rific tion;

or is th a tu l total sta d r d d viation

2

If th labeler a c pts a risk f reje tion of 5 % (i.e h w ants to

h v a pro abi ty f a c pta c , P, of 9 % 1, th ab v e u -

tion re ult in th folow in tj :

L, = jd + 1,50,,

for+ = bM (3)

L, = ,U + 1.50 , + kbM - O t)

foror f ok ,, (4)

F r e ample , s e cla s 8.3

NOT E - Te tin ma be n c s ary fom time to time in ord r to e s re

th t th labele v lu contin eto be core t T estin is also re uire

whe e er phy sic l c a g s are ma e to th prod ction ma hin s th t

ma afe t th ir nois emis ion

th batc ar e d s ribe in this par of IS0 7 7 : sin le s m-

pln , double s mpln a d s q e tial s mpln Th r es lts

o tain d fom a y on of th thre pr oc d re w il g n raly e

distibute ap roximately a a normal distibution is v ld

spe if i d refere c sta d r d d viation, ok & for e c spe ific

famiy of ma hin s

Th s mple siz , n, in th c s of sin le s mpln for e uiv le t

e uiv le t max imum s mple siz nma in th c s of s q e tial

s mpln ) s al also be spe ifie for e c spe if i famiy of

ma hin s (s e a n x A ) In g n ral, double or s q e tial

s mpln re ults in a somewhat smaler n mber of ma hin s

bein te te

NOT E - Th r ea on for ap lyin only on of th thre proc d r es for a

spe if i famiy of ma hin s’is th t th pr oc d reare only e uiv le t

provid d th t th a s mptionof normalty is absolutely v ld

Th proc d r es outln d in 6.2 to 6.4 ar e ap lc ble for

reprod cibi ty con ition (s e 3.17 in IS0 7 7 1 1, a d for

repe tabi ty con ition (s e 3.16 in IS0 7 7 /l) It s al be

a c rain d th t no outsta din sy stematic eror of me s r e-

me t r es lts is con e te w ith rele a t lab rato e

F r e c of th proc d re outln d in 6.2 to 6.4, th me s re

v lu s, Li, s al be d termin d in a cor da c w ith th spe if i

me s reme t te t cod for th spe ific famiy of ma hin s [s e

prior to statistic l c lc lation

In a cord n e w ith 6.1 a d cla s 7, n a d ok ,, h v be n

spe if i d for th rele a t famiy of ma hin s

T ak e at ra dom a s mple of siz n fom th batc u d r con-

sid r ation

T he me s r ed v lu s are Li (i = 1, n) a d th ir me n v lu

is

”

n

c

i=l

A = L, - kfJM

(5)

U - a

k ~

-~,-~-

4-w her e

u1 -Pj -(I

= 1,514

2 1- 0 = 1,6 5

ar e th q a tie of th sta d rdiz d normaldistibution for

th v lu s 1 - p1 _ ( = 9 ,5 % a d 1 - a = 9 % re pe -

tiv ly

T able 1 giv s th v lu s for k for difere t s mple siz s n

T able 1 - A cc ptabi ty con ta t k for difere t s mple siz s n

k

1)

“p

h-a

Us e u tion ( ) or (21, bv repla in - with - =

fi

J;i- u1 - Pl#

- k [s e e u tion f7)l

w her e u,-~,-~ = 1,5

3

Mak e th d cision on th a c ptabi ty of th labele v lu

u in th folow in rule :

if r < A , th labele v lu is confirme a v rifie for th

batc ;

c = L, - k&lM

u in k, fom table 2

( 0)

if L > A , th labele v lu is not confir me a v rifie for If E, < C, th labele v lu is confirme a v rifie for

for th batc

In a cord n e w ith 6.1 a d cla s 7, nl, n a d or, h v be n

spe ifie for th rele a t famiy of ma hin s

T ak e at r an om a s mple of spe if i d siz n1 fom th batc

u d r con id ration

NOT E - Se eample in A.4.2

In a cord n e w ith 6.1 a d cla s 7, nmaw a d em h v be n

spe if i d for th rele a t famiy of ma hin s

Th me s r edv lu s are 15; ( = 1, n, a d th ir me n v lu

is L

B = L, - kpM

(9 )

u in th a c ptabi ty con ta ts k, a d k, giv n intable 2

Star w ith th first item taken fom th batc u d r con id ra-

tion

A fter e c te t, c lc late th f olow in s mmation fom th n*

re ults L; th t h v be n o tain d:

n’

s n” =

c (Lip b)

( 1)

j=,

w her e b is taken fom th ap r opriate column in table 3

T able 2 - A cc ptabi ty con ta ts k, k, a d k for double

s mpln a d e uiv le t s mple siz s (sin le/ double)

T able 3 - A cc ptabi ty v lu s a, b a d r for s q e tial

s mpln a d e uiv le t s mple siz s (sin le/se u ntial)

Do ble s mpln

I

Eq ivalent

sin le s mpln

1

0.8 3

3

2,8 4

5

1.54

NOT E - T he o ly d u le s mpln pla s giv n ar e th s wh s

o eratin c arateristic crv es ar e n are t to th o eratin

cara teristic c rvs for th e uivle t sin le smpln pla s

1

1

I

1

2

2

3

3

n

u in th f olow in rule :

if E < A, th labele v lu is confirme a v rifie for th

batc ;

if z > B, th labele v lu is not confirme a v rifie for

th batc ;

if A < L < B, tak e a s con s mple of spe if i d siz n

Th me s r eme t v lu s of b th s mple are Li ( = 1, ,

“1 + 9) a d th ir total me n is Lt

r

L

,

Seq ential s mpln

3 - 1 2 7 u L, - 0,31 O

5 - 1,52 aM L,-0 ,564UM

6 - 1,71 O L,- 0,6S 2a 4

8 - 2,06 uM L,-0.78 0 ~

9 - 2,18 crM L,-0 ,8420 ,

1 - 2,32 ch.q L,-0,8S 2UM

12 - 2,54 uM L, - 0 ,9 32~

14 - 2,60 cM L, - o,S 66 ,

15 - 2,83 u, L,-0,!%4 ~

r

n

1,71 UM

4

2.~ UM

5

2,6 0 O

9

in le s mpln

NOT E - T he o ly sq e tial pla s giv n ar e th s w ho e o eratin

cara teristic crvs ar e n are t to th o eratin c arateristic c rvs

for th e uivle t sin le smpln pla s

Make th d cision (u in a a d r fom table 3) on th a c p-

tabi ty of th labele v lu u in th folow in rule :

if S, < a, th labele v lu is confir me a v rifie for th

batc ;

if S,*, > r, th labele v lu is not confirme a v rifie for

th batc ;

if a < S, < r, tak e th n xt item at ra dom fom th batc

a d ap ly th rule a ain

4

Sto th s mpln if n* e u ls th spe if i d max imum s mple

ifS” m a x

< 0, th labele v lu is confirme a v rifie for

th batc ;

if S nma > 0, th labele v lu is not confir me a v rifie

for th batc

NOT E - Se e ample inA 4.3

In ord r to dr aw up a doc me t (spe ific label n cod ) for

ma hin s, con id ration s al be giv n to th folow in :

-

e onomic a pe ts of th v rific tion;

- relativ ma nitu e of th con umer’s risk (8, pg, AL ,

s e cla s A 3)

-

me s reme t d ta v riabi ty

Th r es lt of th s con id r ation s al be giv n in th spe ific

label n cod for th spe ific famiy of ma hin s in a cor da c

w ith th lst whic ap e rs below T he e label n spe if i a-

tion s ould preferably be in lu e a a a n x to th spe ific

me s r eme t te t cod for th spe ific famiy of ma hin s

tion :

a) a stateme t th t th spe ific label n cod is ba e on

this par of IS0 7 7 ;

b) a d finition of th famiy of ma hin s to w hic this te t

cod ap le ;

c) id ntific tion of th spe if i me s reme t te t cod for

th spe ific famiy of ma hin s;

cod spe ifie s v ral o tion ;

e) th s mpln proc d re to be u e (sin le, double or

s q e tial) a d rele a t s mple siz (n or nl a d n or nmax )

spe if i famiy ;

f) th refere c sta d r d d viation, or , to be u e whe

v rifyin conformity of a batc of a spe ific famiy;

g) a refere c to th rele a t o er atin c ar acteristic

c rv (OC) in a cor da c w ith a n x A w hic is d termin d

by th information provid d in e) ab v

If a spe ific label n cod for th spe ific famiy of ma hin s

doe not (y t) e ist, y t th method of this par of IS0 7 7

are inte d d to be ap le , th spe if i ation lste ab v

s ould be a re d up n (e.g by conta t) T hu or, mig t be

a re d up n on th ba is of th information on th a tu l total

sta d rd d viation, ot, for th rele a t batc e of ma hin s, a

1) Th tu c tionof th proc d r e whic is ma e for pr actic l re sonalters th o er atin c ara ter istic c rv in a u d fin d w ay Th tu c tion

eror is ig ore in this par of IS0 7 7

5

A nne A

(This a n x forms a inte ral par of th sta d rd

th refore 5 % [pr od c r’s r isk

T his a n x provid s infor mation on th me nin of o er atin c ar acteristic c rv (OCI A s, in

c ar acteristic c rv s a d giv s g id ln s for th u e of th

o er atin c ara ter istic c rv s for s le tin th ap ro riate

s mple siz w he spe ify in a s mpln pla in a spe ific label-

ln cod for a spe if i famiy of ma hin s

Th v lu s for k giv n in table 1are ba e on a prod c r’s risk

of a = 5 % W he th pro orion of nois emis ion v lu s of

A

be n w ron ly reje te is

a dition to th f i e pro-

d c r ’s risk oint (p, _ ~, 1 - a ), th s mple siz n is spe ifie

ina spe ific label n cod for e c spe if i famiy of ma hin s,

th rele a t OC c rv is th refore fix d A n OC c rv s ows

th pro abi ty of a c pta c P, of th batc a a fu ction of

th pro orion p of th nois emis ion v lu s of th batc e -

spe ifie s mple siz s, n, are giv n in fig re 1

NOT E - T he c rv s in fig re 1 ar e d rivd fom

u a

= lq - p - k) x ,5

whic is th g n ral form of e u tio (7) giv n in 6.2

6

Co smer’s ris

p ints for p = 10 % -

p,e l= 6,5%

4

pP

P-

Pro orio p of n is emis io vlus of th lot

ece in th la ele vlu , L,

Fig re 1 - Operatin c ara ter istic c rv s (OCs) for sin le (double a d s q e tial) s mpln

sin le s mpln in pe tion) th e uiv le t double s mpln

a d s q e tial s mpln pla s, in a cor da c with 6.3 a d 6.4,

wer e con tu te T he e OC c rv s are s bsta tialy simiar o

th OC c rv s for th sin le s mpln

fig re 1)

Example

Giv n

In conformity w ith cla s s 6 a d 7, th s mple siz n (og th r

with crM) s al be spe ifie for e c spe ific famiy of ma hin s

cod W he d cidin how to s le t n, it ma h lp to c lc late

pro orion p of nois emis ion v lu s e c e in L,’ th t a -

c pta c would only be p s ible w ith a v ry low pro abi ty of

only 10 % (/ I = 10 % con umer’s risk ) in te d of 9 % con-

n cte with th v lu L, (prod c r’s risk a = 5 %I Th lower

AL is, th larg r is th s mple siz n a d th smaler is th pro-

p rionp of nois emis ion v lu s ex ce din L,’ at th con-

s mer’s risk oint (or th v lu of u, s e table 7)

bM = 2 B

AL = 3 dB

T he

2,9 x 2

3

>

2

= 3.6 = 4

(s e 6.2)

OM

AL L,-L,‘=bq-a -u a )-

fi

.( 2)

Th f olow in spe ific tion are laid dow n for batc e of a

spe if i famiy of ma hin s:

= ( ,6 5 + 1,2 2) % = 2.9 3 %

n

=

3

F r a giv n AL , th s mple siz n is e tabls e afer a

rou din up to th n xt inte er

Labele v alu is L, = 87 dB

( 3)

From table 1:

n=

k = 0 ,5 64

Fig re 2 giv s this relation in graph form

A = L, - k bM = 8 7 - (0 ,564 x 2) = 8 5.9 dB