з; PI н

§

S-500 Hi

Floor Test Level Ш5& ijdim

TABLE 514.4-AXViL ЫдггоууЬапД random-Qn-random vibratipn ?гР8гагп data foir instalkd

MinTOwbtnd 1

lazi

Annpl

TesiL duration per aiids: 270 minutes per 16OOO miles

Sweep BW

Ampl

Sweep BW

BW Ш2)

Ampl

iiiim

VEFrriCAL AXIS (45 minutes per test phase)

ManowbmA.l.

Sweep BW BW Ampl

im im iiimzx

Sweep BW BW

(Hz)

Ampl

!Swe<ep BW

с I Г СЛ

Ч

с

t- I

VO 00

vO О

> 00

t4>

TRANSVERSE AXIS (45 minutes per test phase)

ILONOirrUDINAL AXIS (45 minutes per test phase)

The exaggeratioin (actor waa 2.0.

S Й S 5 i

:= s s 5

2 s g 5 i

Ч

§ с

Ч

о о

-я

m Щ

с s > Ш

m m <n eo I

a о <n ГЧ i

5 § S S = I

о d e d d I

Г4 I>> I

r * *e

- Ч M n M

cs as m m m

0> о VI

о - c* e e

d d d d d d

о о Г4 о

Т 7 ? ? т

rl 0 Г4

о

I I I I I I

Л Г4

P О О *1 M

,3 fH r< #0 o

tpN

ЧО ao M

-! T- M r- ~

V t-i <n

ra 0 В as Oi

d ri d d d

g s в - i s

Til < I

> Й S 2

* - - 2 2

S r ГМ VO

m ъ n

Й a s г i 2 i чк J, J. s

- !s 2

n <o > <л о

n 0> Q о

СЧ n f>> <Ч Г4

О О О О

g 2 8 S 8 i

г* in ft I

, Л < Л <!>

i4i e <й r

Г4 N Ю

Ч r* M

n o. е

О О

n W W W

S 2 3 S 2 2

T 1 I I I I

(Ч NO M

- ГЧ l

о e e

Ы

IO о w о

° :j 2 :2 S ;й

7 7 7 77

00 во fl

22 = 55?

ЧЛ xe <S eo 4

ao < ЧО

о

S V H

~

OOOO

о Ш о

о о V

t V T 7 V

s 2 s 2

fi ЧГ Oi вч

n о as о

- =

T

I I

, e ae

!4 -1 Ч- я

III I I 0 g

о m I

О о о о I

d d d d d I

S S 8 S 8

- M n m n

M N m

Г4 M

r- ~ M Л M

e ir. - - IS

s g 2 я s

s e e э * о

d d d d d d

о о 14 as о

м <o о

7 Т Y Y Т Т

1 г га ю r<

S = - 5

~ - га л

о m <ч п ао о

tn W €* п

о о о о й о

о d d о о d

<о о о

о Г4 ао 1*1 о ю

Т 7 7 7 7 7

м g 2 S а 2

г- 2 2 й я

с* п

IS -s <4 2 S

m г- ао m

S й S s 5г 5

о о о о ао

d d d d d d

e S 5 S

f 7 7 T 7 7

? S S Й s 5

n n IO *o Oi Ю

Oi Oi IO >n

m e I- m

IO N W о r~

о ra m Oi

M о

I I I i

° 2 I

г S 2 s = 8

fill

§ Д S = 8 о о 5 S &

О d d О d 6

1 so Q 0 ГЧ

ЙО о ae *n ao

ЩЩ ЩЩ Ц Щ

G Ь о d G

r< o m so о

S g s s s =

d d о о о о

о о о о о о >>>>>>

- м л ш

О О О О р О Н н Н н i- е-

s s s s s s

METHOD 51 Д.4

M С

9-a

о о чг к-

-a

Б <

< s

6 s.

r- Й

b% о о r

m I

u OO N i

r v> e in <n I

о *- о I

g 2 g S g

r* n m >n

se p.- n e

9. m OS

wr% о ШО o,

e = О = С

s s S й S g

S - r4 *

I I I I I I

W M >0 N

- M m

в , 8 ? S S

* > 7 Т Т Т

в <ч <в S S

* * 2 д я

N га 1 Г1

Г4 о О г4 о

ск m <е ->

п г> е в е v>

о о < ю

е 2 I ?

I I I I I

5 S 2 S 2 I

S й S 5 1

5 ie S i

- I

м а о о 1

О > О О О I

й 2 g S g !

м m <п <n I

s s

V 44 о Г4 о

Ж в О <n dv

S =С о г=

О О 14 В

Г4 О О

7 V V 7 Т Т

л Г4 * <е Г4

2 2 я g 5

Ш Q о -

оо гч1 ri

as ш )

п г< о п

в в - -

*1

я

Г4 Г>> Ю Г>>

5 s; = t5s о

г. S

- \в

0 о о о

а о

S S 2 S f S

1 s § В I

й s s к

о о о

о N о о

?j л в 2

м сч п

й * Р S t 3

r> о о

га In gn >Q ! !

1 л ♦ I I О <1 г I I

О С О О

s г g S I

7 7 7 7 I

о о а о I

м ав п I

м м

*= гч ч ?

= о и

ее *

g й S 5 S Я

о е S о о о

о ао о г4 fo о

7777??

S б 5?

е m о <П 0 а г> <П П СП Ч>

О О О Г rs

11 ?????? 1

Р S J г S я

ГМ fM ОО М

[ J Ю J

CM n о

<o <a <n

о n rt (П о

d 6 о о

2 2 S 5 i §

:s Ж s : s

7 85

J. E :5

VI V% ГЧ о

14 M e

о - M (Ч C4

о e о о e s

о d о о о о

г4 m v >n <е

О О О p О 5 >>>>>>

g 8 S S S о

d о о о о о

О О р Р О S И н н - н н

S S . . .

о о о е о

о. г-

S о

fn V ш >о

S S S S

а

METHOD 514.4

u> I

>

§

table; s14.4-axx. NiUTCiwband random-on-random vibratiion proyram data fnr installed CHuipmeitt on the

{ШJilLJgallLiU)dJЮШlSQa.fiLthtJuuiшL£Iшцшu

Test dunitloin per axis;: 270 minul.es per 6000 milles

5-500 Hz

Mtmiwbiind 2

Ampl

ЫлпапЬшай 3

N iT04fh nil 4

NtfTowhiind i

SwiEcp BW

Ampl

Sweep BW BW /Lffipl

im im iiiiHix

Sweep

BW BW

im ШгХ

Sweep >kmpl BW

uim<2X-.im

VERTIC/L AX IS

0.0573 0.3380 0.5050 0.0881 0.4918 0.7815

TRANSVERSE >iXIS

0.0273 0.0966 0.3112 0.0898 0.24S0 0.2714

<< 6 12 12 HI 12

72-90 1019-126 144-1110 19l8-2:>4 2512-306 324-3(50

0.0231 0.0581) O.ISOO 0.0690 0.0673 0.0825

18 18 27 18

96-120 0.0076

144-168 0.0836

192-240 0.0484

264-312 0.0123

336-408 0.0330

432-480 0.0496

12 12 24 24 36 24

120-150 180-210 240-300 330-390 420-500

0.0100 O.021O 0.0185 0.0126 0.0125

LONGITUDINAL AJCIS

0.0062 0.0219 0.0399 Э.0147 0.0876

( (i

12 12 18

72-90 108-126 144-180 198-234 252-306

0.0055 0.0091 0.0619 0.0134 0.2499

216-240 0.2203 12 324-360 0.4211

9 96-120 О.ШЗ 12

9 144-168 O.0I1I7 12

18 192-240 0.01177 24

18 264-312 0.0379 24

27 336-408 0.1128 36

120-150 0.0030

180-210 0.0185

240-300 0.0612

330-390 0.0762

420-500 0.0107

15 15 30 30 45

IS 15 30 30 45

00 о VO M

The exiiggerallon (aclor was 2.0.

TABLE S14.4-/OCXL £Lшl]]ldшuLaшlшn=QOl=Iaildiж^IaUialLiшшaJ liaUiistaltedjequtpmeiu.JiiLihfiJuiruJlJhaLj

Test dunition per axis: 270 ralnuttes per 6000 miles

t- 00

00 VO

О

>

0>

H wnwt> nd 1

3-300 Hz

Ampl

SwiMp BW

Ampl

VERTIC/lL AXIS

0.001Й 0.0040 0.0352 0.0263 0.0103

5 5 10 10 3

120I-15O 1631-195

TRAINSIRSE AXIS

0.0009 0.0016

5 5 10 10 5

BW BW Ajnpl

Switip

BW BW

Swtep

Ajnpl BW

isimii-ititx

60-75 0.0012 7.5

0.0193 0.0033

15 15

160-200 0.0110 220-260 0.0034

20 20

200-230 275-325

O.O0I75 0.0019

25 25

60-75 0.0005 7.5

120 -13O 0.0017 15 160-200 0.0012 20

31Ch-225 0.0014 7.5 LONamJDlINAL AXIS

0.0026

5 ------

10 -------

10 ----

5 ----

TABLE S14.4->0(XU. £ia□[Q]idШldJШlШ=filL::Iaa£lfiIILUltlIa]i

for installed equipment in the hull nf the M60A3 tank.

Test duration per axii: 270 minutes per 6000 miles

Nstiowbind 1

5-300 Hz

Nerrowhiend 2

Ampl

Nenrowbend 3

N rT04irt> nd 4

fferrowbiind 5

Sweep

Ш

Ampl

Sweiip BV/ BW ympl

Sweep BW BW

im ixm

VERnC/\L A>:iS

0.0017 0.0052 0.0133 0.0231 0.0470

10 10

90-105

16:5-1<I5 210-225

0.0020 7.5

0.0144 15

0.023CI 15

0.О34Я 7.5

TRANSVERSE iJCIS (54 minutes per test phase)

160-200 0.0125 220-260 0.0164 280-300 0.O097

160-2l}0 O.O024 220-260 0.O038 280-3(Ю 0.O031

20 20 10

Sweefi BW

275-325 0.0036 25

LONGITUDINAL AXIS (54 minutes per test phase)

о о

The exaggeration (actor was 2.0.

90-105

120-1 ;ra

16;!-15>5 210-225

0.0024 0.0247 0.0181 0.009C

7.5 115 15

120-140 0.0(919 160-200 0.0046 220-260 0.0(D47

00 о VO M

METHOD 514.4

€ТЮО 515.4 ACOUSTIC NOISE

PAOE

SECTIOJJ I

I-l PURPOSE ...................... 515.4-1

1-2 ENVITONHENTAL Ш'КЬХГШ...............515.4-1

1-3 GUIDELINES FX)R DETERMINlMa TEST

PROCEDURES AND TEST CONDITIONS..........515.4-1

1-4 SPECIAL CONSIDERATIONS ............... 515.4-10

i-5 Ш^ШЮШ.....................515.4-10

SEGTIOK II

II-l APPARATUS ..................... BIS.4-15

II-2 PREPARATION FOR TEST................ 515.4-15

II-3 PHOCEDURES ..................... 515.4-16

11-4 INFORMATION TO BE RECORDED............. 515.4-18

3ECTI0V I

1-1 PURPOSE. The acoustic noise test Is conducted to measure howvuell a piece of equipment will withstand op operate In Intense acoustic noise fields. The acoustic noise test conplements tests for structure-home vibrations (method 514).

1-2. E??VIRONMEifrAL £?f£.CTS. Acoustic noiss can prcdvics vibration in squijKisnt Silar to that prodused by nechanical ly transsdtted vibration. In an acoxtic noise field, pressure fluctuations impinge directly on the equipment. The attenuation effects of mechanical transmission are missing and the response of the equifnoent can be significantly gi>eater. Further, conponents vtelch are effectively isolated from

mechanical transmission will be excited directly. Exanples of acoustically indticed

-. -

a. Failuf*e of ndcroeleetronic coaropnent lead v?ires

b. Chafing of wires.

c. Cracking of printed circuit boards.

d. !!fe.lf<jncticn/failupe of waveguides, Klystrcn tubes.

e. Vibration of optical elements.

1-3 OUIDELINES FOR DETERMINING TEST PROCEDURES AND TEST CONDITIONS

iSuTE: The tailoring process as described in section 4 of this document should be used Ins the approprists tests and test variables.

HErraOD 515.4

a. Appl ication. The acoustic noise test applies to any eqtilixnent operated or stored in the intense acoustic noise fields that occur in or near aircraft, missiles, and large machinery such as punps and generators. In particular, it applies to:

(1) Internally-carried airborne eqiiipment.

(2) Assembled externally-carried stores

(3) Ground support equipment on the flightline.

Acoustic testing is performed if the operational acoustic level exceeds 135 dB or vibration testing is inpractical.

b. Hestrictions. This method is not applicable to space and water vehicles or

for hearing safety, nor is it applicable %q itess which, because of their construction, are insensitive to acoustic noise. Examples of stich equipment are items that have small surfaces, high ratios of mass-to-area and high internal damping. Exanples are

(1) High density modules, particularly if they are encapsulated and

(2) Equipment that is sxjrrounded by a heavy metal case, particularly if the equipment is potted.

A practical guideline is that acoustic tests are not required If eqviipment is exposed to broadband random noise at a sound pressure level less than 130 dB (ref 20 Pa) overall, and if its exposure in every one-Hertz band is less than 100 dB (ref 20 Pa).

c. SeoTjence. Acoustic testing ney he perforrasd anywhere in the test process. The accumulated effects of euoustlc stress may affect equipment performance under other environmental conditions, siich as tenperature, altitude, hш>idlty. or EMI/ENC. WSien it is desired to evaluate the cumulative environmental effects of acoustic noise (1-2) and other environments, a single test item should be exposed to all environmentai eonditions, with acoustic noise testing performed first.

d. Test variations.

(1) Test procedures. This method is conposed of four procedures: the environmental worthiness test, the qualification test, the mission profile test, and the cavity resonance test.

t2) Test conditions. Within each procedure, values miist be assigned to the following variables:

(a) Soimd spectrijm.

(b) Dynamic pressure level.

(c) Duration.

(d) Tolerances.

(e) Acoustic excitation field: reverberant, progressive wave, or

Jet engine.

1-3.1 Choice of test procedures. The choice of test procedure(s) depends on:

a. ТЪе stage of th© item in the design process.

b. Whether or not accelerated testing is desired.

c. Whether an open cavity on an aircraft or aircraft store is involved.

d. Test item configuration: external ly-carried aircraft stores may have to be tested in both the asseitibled and free-flight configurations.

e. Whether one test obviates another: if one test is m:>re stressful in all variables than another, the easier test need not be performed (e.g., functional test vs endurance test, captive flight vs, free flight).

1-3.1.1 Procedure I - Environmental worthiness test. The environmental worthiness

test is a relatively short test used during engineering development to identify

defects in a prototype or flight test item before attempting service or flight testing

with the same unit. It helps to eliminate slnple, rapidly occurring problems

that can delay or prevent service or flight testing. The test simulates the

most severe environmental conditions expected during service for flight

testing.

1-3.1.2 Procedure II - Qualification test. The qualification test is used to demonstrate the test items conpliance with contract requirements. Only the most severe anticipated service environments are used as the basis for testing.

It is divided into ftmctional and endisanee tests. Th% fxjnetional test mLJSt be tailored to show wAiether the item can perform to specification in the nost severe environment of its service life. The endurance test is an accelerated test and must be tailored to sinulate the items lifetime damage accumulation. Test sequence is one-half hour functional test, endurance test, and another one-half hour functional test.