MIL-STD-202H.pdf - 第202页

MI L - S TD - 202 -2 1 4 CO NT E N T S PARAGRAPH PAG E FOREW ORD … ………………………………………………………. ii 1. SCOPE 1 1.1 Purpose …… ………………… …………………. …… .. …………. 1 2. APPLICABLE D O C U M EN T S 1 3. DEFINTIONS 1 4. GENERAL RE Q UI R …

MIL-STD-202-214

FOREWORD

1. This standard is approved for use by all Departments and Agencies of the Department of Defense.

2. This entire standard has been revised. This revision has resulted in many changes to the format, but the most

significant one is the splitting the document into test methods. See MIL-STD-202 for the change summary.

3. Comments, suggestions, or questions on this document should be emailed to std202@dla.mil or addressed to:

Commander, Defense Logistics Agency, DLA Land and Maritime, ATTN: VAT, P.O. Box 3990, Columbus, OH

43218–3990. Since contact information can change, you may want to verify the currency of this address

information using the ASSIST Online database at https://assist.dla.mil.

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MIL-STD-202-214

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 Apparatus………………………………………….….........……. 1

4.1.1 Vibration system....................................................................... 1

4.1.1.1 Control and analysis of vibration………………………………. 2

4.1.2 Monitoring………….…….………………….………...…………. 2

4.1.2.1 Vibration input..………………..…….………………..…………. 2

4.2. Method of mounting…………………………..….….………….. 2

4.3. Procedure………………………………………..……..…………. 3

5. DETAILED REQUIREMENTS 5

5.1 Measurements ……………………………………..……………. 5

5.2. Summary…………………………………………..…..…………. 5

6. NOTES 6

6.1 Supersession data………………………………………………. 6

FIGURES PAGE

1. Test condition I, random vibration test-curve envelope(see table I)….. 3

2. Test condition II, random vibration test-curve envelope (see table II)... 4

TABLES PAGE

I. Values for test-condition I……………….…………………………….…… 4

II. Values for test-condition II…………….……………………..……….…… 5

iii

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MIL-STD-202-214

METHOD 214

RANDOM VIBRATION

1. SCOPE

1.1 Purpose. This test is conducted for the purpose of determining the ability of component parts to withstand the

dynamic stress exerted by random vibration applied between upper and lower frequency limits to simulate the

vibration experienced in various service field environments. Random vibration is characteristic of modern field

environments produced by missiles, high-thrust jets and rocket engines. In these types of environments, the random

vibration provides a more realistic test. For design purposes, however, a swept frequency sinusoidal test may yield

more pertinent design information.

2. APPLICABLE DOCUMENTS

This section not applicable to this standard.

3. DEFINTIONS

This section not applicable to this standard.

4. GENERAL REQUIREMENTS

4.1. Appartaus.

4.1.1 Vibration system. The vibration system, consisting of the vibration machine, together with its auxiliary

equipment shall be capable of generating a random vibration for which the magnitude has a gaussian (normal)

amplitude distribution, except that the acceleration magnitudes of the peak values may be limited to a minimum of

three times the rms (three-sigma (σ) limits). The machine shall be capable of being equalized so that the magnitude

of its spectral density curve will be between specified limits (for example, see figures 1 and 2) when the test item, or a

substitute equivalent mass, is appropriately secured to the vibration machine. The equalization of an electro-dynamic

vibration machine system is the adjustment of the gain of the electrical amplifier and control system so that the ratio

of the output vibration amplitude to the input signal amplitude is of a constant value (or given values) throughout the

required frequency spectrum.

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