MIL-STD-202H.pdf - 第100页

MI L - S TD - 202 -2 01 M E TH O D 20 1 VI BR AT I O N 1. SCOPE 1. 1 P urpose . The v ib r at i o n t e s t i s u s ed t o d et er m i ne t he ef f ec t s on c o m pon ent par t s of v i b ration w ithin the predominant …

MIL-STD-202-201

CONTENTS

PARAGRAPH PAGE

FOREWORD…………………………………………………………. ii

1. SCOPE 1

1.1 Purpose………………………………………….……..…………. 1

2. APPLICABLE DOCUMENTS 1

3. DEFINTIONS 1

4. GENERAL REQUIREMENTS 1

4.1 Procedure………………………………………..……..…………. 1

5. DETAILED REQUIREMENTS 1

5.1 Measurements……………………………………..…..…………. 1

5.2 Summary.…………………………………..……..…..…………. 1

6. NOTES 2

6.1 Supersession data………………………………………………. 2

iii

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MIL-STD-202-201

METHOD 201

VIBRATION

1. SCOPE

1.1 Purpose. The vibration test is used to determine the effects on component parts of vibration within the

predominant frequency ranges and magnitudes that may be encountered during field service. Most vibration

encountered in field service is not of a simple harmonic nature, but tests based on vibrations of this type have proved

satisfactory for determining critical frequencies, modes of vibration and other data necessary for planning protective

steps against the effects of undue vibration. Vibration, by causing loosening of parts or relative motion between parts

in the specimen, can produce objectionable operating characteristics, noise, wear, and physical distortion, and often

results in fatigue and failure of mechanical parts.

2. APPLICABLE DOCUMENTS

This section not applicable to this standard.

3. DEFINTIONS

This section not applicable to this standard.

4. GENERAL REQUIREMENTS

4.1 Procedure.. Prior to vibration, the specified tests or measurements shall be made. The specimens shall be

mounted as specified using suitable mounting apparatus to assure that mounting is free from resonances over the

test frequency range. The specimens shall be subjected to a simple harmonic motion having an amplitude of 0.03

inch (0.06 inch maximum total excursion), the frequency being varied uniformly between the approximate limits of 10

and 55 hertz (Hz). The entire frequency range, from 10 to 55 Hz and return to 10 Hz, shall be traversed in

approximately 1 minute. Unless otherwise specified, this motion shall be applied for a period of 2 hours in each of 3

mutually perpendicular directions (total of 6 hours).1/ If applicable, this test shall be made under electrical-load

conditions.

5. DETAILED REQUIREMENTS

5.1 Measurements. The specified measurements shall be made during and after vibration.

5.2 Summary. The following details are to be specified in the individual specification:

a. Tests and measurements prior to vibration (see 4.1).

b. Method of mounting (see 4.1).

c. Duration of vibration, if other than that specified (see 4.1).

d. Direction of motion, if other than that specified (see 4.1).

e. Electrical-load conditions, if applicable (see 4.1).

f. Tests and measurements during and after vibration (see 5.1).

1/ In the previous issue of this method, test conditions A and B referred to a length of test of 5 hours and 2-1/2

hours, respectively.

北测（上海）电子科技有限公司

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MIL-STD-202-201

6. NOTES

(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)

6.1 Supersession data. The main body and 38 parts of this revision of MIL-STD-202 replace superseded MIL-STD-

202.

Custodians: Preparing activity:

Army - CR DLA – CC

Navy - EC

Air Force - 85 (Project 59GP-2015-017)

DLA - CC

Review activities:

Army - AR, AT, AV, CR4, MI, SM, TE

Navy - AS, OS, SH

Air Force - 19, 99

NSA - NS

NOTE: The activities listed above were interested in this document as of the date of this document. Since

organizations and responsibilities can change, you should verify the currency of the information above using the

ASSIST Online database at https://assist.dla.mil/

北测（上海）电子科技有限公司

联系方式：xuyj@beice-sh.com 13917165676