MIL-STD-202H.pdf - 第116页

MI L - S TD - 202 - 20 4 CO NT E N T S (c o n t i nued) 5. DETAILED RE Q UI RE M E N T S 6 5.1 Length of tes t ………………… …………………. . ………………. 6 5.2. M easuremen t s ………………… …………………. . …. . …………. 6 6. NOTES 6 6.1 Superses si …

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MIL-STD-202-204
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 Mounting………………………………………….…...…………. 1
4.2 Test condition A (10g peak)…………………….………………. 1
4.2.1 Amplitude…………………………………………….…………… 1
4.2.2 Frequency range………………………………………..….……. 1
4.2.3 Sweep time and duration………………………….……………. 1
4.3 Test condition B (15g peak)……………………………….……. 1
4.3.1 Amplitude……………………………..…………………….……. 1
4.3.2 Frequency range…………………..……...……………….……. 1
4.3.3 Sweep time and duration………….……………………………. 2
4.4 Test condition C (10g peak)…………..………….....…………. 2
4.4.1 Part 1……………………………………………………………… 2
4.4.2 Part 2……………………………………………………………… 2
4.4.3 Resonance……………………………..………………………… 2
4.5 Test condition D (20g peak)……………………………….…… 2
4.5.1 Amplitude…………………………………………………………. 2
4.5.2 Frequency range…………………………………………………. 2
4.5.3 Sweep time and duration……………………………………..… 2
4.6 Test condition E (50g peak)……………………………………. 2
4.6.1 Amplitude……………………………………………………….… 2
4.6.2 Frequency range………………………………………………… 4
4.6.3 Sweep time and duration……………………………………….. 4
4.7 Test condition F (20g peak)…………………………………..… 4
4.7.1 Amplitude……………………………………………………….… 4
4.7.2 Frequency range………………………………………………… 4
4.7.3 Sweep time and duration……………………………………….. 4
4.8 Test condition G (30g peak)…………………………………..… 4
4.8.1 Amplitude……………………………………………………….… 4
4.8.2 Frequency range………………………………………………… 4
4.8.3 Sweep time and duration……………………………………….. 4
4.9 Test condition H (80g peak)…………………………………..… 4
4.9.1 Amplitude……………………………………………………….… 5
4.9.2 Frequency range………………………………………………… 5
4.9.3 Sweep time and duration……………………………………….. 5
4.10 Alternate procedure for use of linear in place of
logarithmic change of frequency……………………………….. 5
4.10.1 Example of alternate procedure……………………………..… 5
iii
北测（上海）电子科技有限公司
联系方式：xuyj@beice-sh.com 13917165676
MIL-STD-202-204
CONTENTS (continued)
5. DETAILED REQUIREMENTS 6
5.1 Length of test……………………………………..………………. 6
5.2. Measurements……………………………………..…..…………. 6
6. NOTES 6
6.1 Supersession data………………………………………………. 6
FIGURE PAGE
1. Vibration-test curves……………………………………………….…….… 3
iv
北测（上海）电子科技有限公司
联系方式：xuyj@beice-sh.com 13917165676
MIL-STD-202-204
METHOD 204
VIBRATION, HIGH FREQUENCY
1. SCOPE
1.1 Purpose. The high frequency vibration test is performed for the purpose of determining the effect on
component parts of vibration in the frequency ranges of 10 to 500 hertz (Hz), 10 to 2,000 Hz or 10 to 3,000 Hz, as
may be encountered in aircraft, missiles, and tanks. The choice of test condition A, B, C, D, E, F, G, or H should be
based on the frequency range and the vibration amplitude dictated by the applications of the component under
consideration, and the state of the component part in relation to resistance-to-vibration damage.
2. APPLICABLE DOCUMENTS
This section not applicable to this standard.
3. DEFINTIONS
This section not applicable to this standard.
4. GENERAL REQUIREMENTS
4.1 Mounting. The specimens shall be mounted as specified. For specimens with attached brackets, one of the
vibration test directions shall be parallel to the mounting surface of the bracket. Vibration input shall be monitored on
the mounting fixture in the proximity of the support points of the specimen.
4.2 Test condition A (10g peak). The specimens, while deenergized or operating under the load conditions
specified, shall be subjected to the vibration amplitude, frequency range, and duration specified in 4.2.1, 4.2.2, and
4.2.3, respectively (see figure 1).
4.2.1 Amplitude. The specimens shall be subjected to a simple harmonic motion having an amplitude of either
0.06-inch double amplitude (maximum total excursion) or 10 gravity units (g peak), whichever is less. The tolerance
on vibration amplitude shall be ±10 percent.
4.2.2 Frequency range. The vibration frequency shall be varied logarithmically between the approximate limits of
10 and 500 Hz (see 4.10), except that the procedure of method 201 of this standard may be applied during the 10 to
55 Hz band of the vibration frequency range.
4.2.3 Sweep time and duration. The entire frequency range of 10 to 500 Hz and return to 10 Hz shall be traversed
in 15 minutes. This cycle shall be performed 12 times in each of three mutually perpendicular directions (total of 36
times), so that the motion shall be applied for a total period of approximately 9 hours. Interruptions are permitted
provided the requirements for rate of change and test duration are met. Completion of cycling within any separate
band is permissible before going to the next band. When the procedure of method 201 of this standard is used for
the 10 to 55 Hz band, the duration of this portion shall be the same as the duration for this band using logarithmic
cycling (approximately 1-1/3 hours in each of three mutually perpendicular directions).
4.3 Test condition B (15g peak). The specimens, while deenergized or operating under the load conditions
specified, shall be subjected to the vibration amplitude, frequency range, and duration specified in 4.3.1, 4.3.2, and
4.3.3, respectively (see figure 1).
4.3.1 Amplitude. The specimens shall be subjected to a simple harmonic motion having an amplitude of either
0.06-inch double amplitude (maximum total excursion) or 15g (peak), whichever is less. The tolerance on vibration
amplitude shall be ±10 percent.
4.3.2 Frequency range. The vibration frequency shall be varied logarithmically between the approximate limits of
10 to 2,000 Hz (see 4.10), except that the procedure of method 201 of this standard may be applied during the 10 to
55 Hz band of the vibration frequency range.
1
北测（上海）电子科技有限公司
联系方式：xuyj@beice-sh.com 13917165676