MIL-STD-202H.pdf - 第106页
MI L - S TD - 202 - 203 M E TH O D 203 RA NDO M D RO P 1. SCOPE 1. 1 P urpose . T he ran do m - dr op t e s t i s u s ed t o d et er m i n e t h e ef f e c t s on c o m po nent par t s of random, repe ated impact due t o…
MIL-STD-202-203
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
4.2. Procedure………………………………………..……..…………. 1
5. DETAILED REQUIREMENTS 2
5.1 Measurements……………………………………..…..…………. 2
6. NOTES 7
6.1 Supersession data………………………………………………. 7
FIGURE PAGE
1. Typical assembly of four-cage random-drop-test machine ………….… 2
2. Cage assembly……………………………………………………………… 3
3. Cage (interior). ……………………………………………………………… 4
4. Sleeve………………………………………………………………………… 6
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北测（上海）电子科技有限公司
联系方式：xuyj@beice-sh.com 13917165676
MIL-STD-202-203
METHOD 203
RANDOM DROP
1. SCOPE
1.1 Purpose. The random-drop test is used to determine the effects on component parts of random, repeated
impact due to handling, shipping, and other field service conditions. The test is an accelerated test designed to
indicate structural and mechanical weaknesses of types not necessarily detected in shock and vibration tests.
2. APPLICABLE DOCUMENTS
2.1 General. The documents listed in this section are specified in sections 4 and 5. While every effort has been
made to ensure the completeness of this list, document users are cautioned that they must meet all specified
requirements documents cited in sections 4 and 5, and the individual test methods of this standard, whether or not
they are listed.
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.
FEDERAL SPECIFICATIONS
QQ-B-654 - Brazing Alloys, Silver
QQ-S-698 - Steel, Sheet and Strip, Low Carbon
(Copies of these documents are available online at http://quicksearch.dla.mil)
2.3 Non-Government publications. The following documents 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.
ASTM INTERNATIONAL (ASTM)
ASTM A519 - Standard Specification For Seamless Carbon and Alloy Steel Mechanical Tubing
(Copies of this document are available online at www.astm.org)
3. DEFINTIONS
This section not applicable to this standard.
4. GENERAL REQUIREMENTS
4.1 Apparatus. The random-drop test machine consists of an assembly of either two or four steel cages as shown
on figure 2, with provisions for rotation about a common axis. The interior of each cage shall be as shown on figure
3. A typical 4-cage machine is shown on figure 1. Steel sleeves as shown on figure 4 shall be used to mount the
specimen.
4.2 Procedure. The specimen shall be rigidly mounted by the normal mounting means in the steel sleeve so that
no part of the specimen, including terminals or external hardware of the component, will extend beyond the sleeve.
When necessary, a suitable adapter may be used within the sleeve. End caps shall not be used on the sleeves.
Through bolts may be employed as needed to mount the specimens in the sleeve. Only one sleeve shall be placed
in each cage during test. The number of specimens mounted in each sleeve shall be limited only by the available
space. Specimens shall be subjected to the random-drop test for a period of 45 minutes at a speed of four to six (4 –
6) revolutions per minute. The machine shall be rotated in the direction shown on figure 3.
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北测（上海）电子科技有限公司
联系方式：xuyj@beice-sh.com 13917165676
MIL-STD-202-203
5. DETAILED REQUIREMENTS
5.1 MEASUREMENTS. Upon completion of the test, measurements shall be made as specified in the individual
specification.
FIGURE 1. Typical assembly of four-cage random-drop-test machine.
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北测（上海）电子科技有限公司
联系方式：xuyj@beice-sh.com 13917165676