MIL-STD-202H.pdf - 第132页

MI L - S TD - 202 - 207 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 2.2.1 Specificatio n s , s t a ndar ds…

MIL-STD-202-207

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-202-207

CONTENTS

PARAGRAPH PAGE

FOREWORD…………………………………………………………. ii

1. SCOPE 1

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

2. APPLICABLE DOCUMENTS 1

2.2.1 Specifications, standards, and handbooks………………….... 1

3. DEFINTIONS 1

4. GENERAL REQUIREMENTS 1

4.1. Precautions………………………………………………………. 1

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

4.3 Anvil plate…………………………………………………………. 1

4.4 Hammers………………………….………………………………. 2

4.5 Mounting fixtures………………...………………………………. 2

4.6. Procedure………...…………………..…………………………. 2

4.6.1 Mounting method……………………..…………………………. 2

4.6.2 Anvil-plate bolts and positioning springs………………………. 2

4.6.3 Direction of shock……………………………………….………. 2

4.6.4 Height of hammer drops………….…………………….………. 2

4.6.5 Hammer supports……….…………………….…………………. 2

4.6.6 Electrical load and operating conditions….………..…………. 2

4.6.7 External resilient mountings.…………..…….…………………. 2

5. DETAILED REQUIREMENTS 17

5.1 Measurements ……………………………………..………………. 17

5.2. Summary…………………………………………..…..…………. 17

6. NOTES 17

6.1 Supersession data………………………………………………. 17

FIGURE PAGE

1. High-impact shock-testing apparatus …………………….………..….… 3

2. High-impact shock-testing apparatus (backview) with anvil

plate located for back and top blows……………………………….......... 4

3. Anvil plate of shock-testing apparatus………………………..…….....…. 5

4A. Standard mounting fixtures for electrical-indicating switchboard

meters and other panel-mounted parts………………………………….. 6

4B. Standard mounting fixtures for electrical-indicating switchboard

meters and other panel-mounted parts……………………..…………… 9

5. Standard mounting fixtures for electrical controller parts

(contractors, relays, resistors, etc.)………………………………………. 12

6. Standard mounting fixtures for deck, or platform, mounted parts…...… 14

TABLE PAGE

I. Spacers……………………………………………………………………….. 13

II. Mounting panels…………………………………………………………….. 13

iii

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MIL-STD-202-207

METHOD 207

HIGH IMPACT SHOCK

1. SCOPE

1.1 Purpose. This test is performed for the purpose of determining the ability of various parts to withstand shock of

the same severity as that produced by underwater explosions, collision impacts, near-miss gunfire, blasts caused by

air explosions, and field conditions. Exact simulation of some of the severe shock motions experienced in the field is

difficult to reproduce; however, parts that successfully complete the test of this method have been found to possess

the necessary ruggedness for this use. The test apparatus utilized in this method is the same as that designated as

Shock Testing Machine for Lightweight Equipment in

MIL-S-901, Shock Tests, HI (High-Impact), Shipboard

Machinery, Equipment and Systems, Requirements for. The purpose of this apparatus is to determine the ability of

equipment installed aboard naval ships to withstand shock and still continue to perform its operational function. This

test method is limited to testing of parts weighing not more than 300 pounds.

2. APPLICABLE DOCUMENTS

2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a

part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are

those cited in the solicitation or contract.

DEPARTMENT OF DEFENSE SPECIFICATIONS

MIL-S-901 - Shock Tests, H.I. (High Impact), Shipboard Machinery, Equipment, and Systems,

Requirements For

MIL-DTL-1222 - Studs, Bolts, Screws and Nuts for Applications Where a High Degree Of Reliability Is

Required; General Specification For

MIL-I-24768/14 - Insulation, Plastic, Laminated, Thermosetting, Cotton-Fabric-Base, Phenolic-Resin (FBG)

(Copies of these documents are available online at http://quicksearch.dla.mil)

3. DEFINTIONS

This section not applicable to this standard.

4. GENERAL REQUIREMENTS

4.1. Precautions. The apparatus shall be examined periodically for damage. Any hardware that has become

defective by being deformed or cracked shall be replaced. Particular attention shall be given to the anvil plate which

shall not be bowed more than 1 inch at the center. Proper safeguards shall be taken to protect personnel from

objects that may become loosened and act as projectiles as a result of this test. A sound-warning arrangement shall

be made, for use in alerting personnel in the vicinity of the test of the impending drop of the hammer.

4.2. Apparatus. The apparatus used in this test method shall be as shown on figure 1 and the associated detail

drawings. The parts shall be installed on a mounting fixture which is attached to the anvil plate of the shock-testing

apparatus. A 400-pound hammer shall be dropped from a specified height (see 4.6.4) onto a shock pad located on

the anvil plate. The shock motion is then transmitted by the anvil plate to the parts attached on the mounting fixture.

4.3 Anvil plate. The test apparatus of this method is so constructed that the anvil plate (see figure 3) can be

installed, in sequence, in two positions. By utilizing these two installation positions and separately employing both

hammers of the apparatus shock is applied through the three principal mutually perpendicular axes of the part being

subjected to test. One position is to locate the anvil in such a manner that it will receive blows through the back of the

anvil plate by contact from the horizontal hammer, and blows on the top shock pad of the anvil plate by a drop of the

vertical hammer as shown on figure 2. The other position is as shown on figure 1, whereby the end shock pad is

contacted by the horizontal hammer.

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