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MIL-STD 202 High Frequency Vibration Testing

The high frequency vibration test is performed for the purpose of determining the effect of vibration on component parts. This vibration is in the frequency ranges of 10-500 hertz (HZ), 10-2,000 Hz or 10-3,000 Hz. These are frequencies that may be encountered in aircraft, missiles, and tanks.

The use of test condition A, B, C, D, E, F, G, or H should be based on frequency range. Or it should be based on the vibration amplitude. This is dictated by the applications of the component under consideration. It also depends on the state of the component part in relation to resistance-to-vibration damage.

Keystone Compliance is one of the best high frequency vibration labs with significant MIL-STD-202 high frequency vibration test experience. Our high frequency vibration testing lab and test engineers understand the nuances of the vibration profiles and vibe testing. That is why so many manufactures trust Keystone’s vibration testing services.

The following information is extremely technical in nature. It was derived from MIL-202G high frequency vibration. Even though the language is from 202G high frequency vibration, it applies previous versions military standards. This includes MIL-STD 202H high frequency vibration.

Test Condition A (10g peak) for MIL-STD 202 High Frequency Vibration:

The specimens are tested while de-energized or operating under the load conditions specified. In the high frequency vibration lab, they are subjected to the vibration amplitude, frequency range, and duration specified.

What Amplitude Should Be Used in MIL-202 High Frequency Vibration?

The specimens shall be subjected to a simple harmonic motion. This motion must have an amplitude of either 0.06-inch double amplitude or 10 gravity units (g peak), whichever is less. The tolerance on vibration amplitude shall be ±10 percent.

What Frequency Range is Appropriate?

The vibration frequency shall be varied logarithmically between the approximate limits of 10 and 500 Hz.  However, the procedure of method 201 may be applied during the 10-55 Hz band of the vibration frequency range.

What is the Best 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, a total of 36 times. This is 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 method 201 is used for the 10 to 55 Hz band, the duration should equal the duration for this band. Using logarithmic cycling, that is approximately 1-1/3 hours in each of three mutually perpendicular directions.

Test condition B (15g peak) for 202 High Frequency Vibration

The specimens are tested while de-energized or operating under the load conditions specified. They are subjected to the vibration amplitude, frequency range, and duration.

What Amplitude Should Be Used in MIL-202 High Frequency Vibration?

The specimens shall be subjected to a simple harmonic motion. This motion should have an amplitude of either 0.06-inch double amplitude  or 15g (peak), whichever is less. The tolerance on vibration amplitude shall be ±10 percent.

What Frequency Range is Appropriate?

The vibration frequency shall be varied logarithmically between the approximate limits of 10 to 2,000 Hz. However, the procedure of method 201 may be applied during the 10-55 Hz band of the vibration frequency range.

What is the Best Sweep Time and Duration?

The entire frequency range of 10 to 2,000 Hz and return to 10 Hz shall be traversed in 20 minutes. This cycle shall be performed 12 times in each of three mutually perpendicular directions (total of 36 times). This is so that the motion shall be applied for a total period of approximately 12 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 method 201 is used for the 10 to 55 Hz band, the duration should equal the duration for this band. Using logarithmic cycling it is approximately 1-1/3 hours in each of three mutually perpendicular directions.

Test Condition C (10g peak) for MIL-STD 202 High Frequency Vibration:

The specimens are tested while de-energized or operating under the load conditions specified. They are subjected to the vibration amplitude and frequency range. The tolerance on vibration amplitude shall be ±10 percent.

Part 1

The specimens shall be tested in accordance with method 201 of this standard. They are tested for 6 hours; 2 hours in each of three mutually perpendicular directions.

Part 2

The specimens shall be subjected to a simple harmonic motion. This motion must have an amplitude varied to maintain a constant peak acceleration of 10g (peak). The frequency is varied logarithmically between the approximate limits of 55 and 2,000 Hz. The entire frequency range of 55 to 2,000 Hz (no return sweep) shall be traversed in 35 ±5 minutes.

However in the vicinity of what appears to be resonance, the above rate may be decreased. This is down to facilitate the establishment of a resonant frequency. If resonance is detected, specimens are vibrated for 5 minutes at each critical resonant frequency observed.

This procedure shall be performed in each of three mutually perpendicular directions. Interruptions are permitted provided the requirements for rate of change and test duration are met.

What is the Critical Resonant Frequency?

A critical resonant frequency is that frequency at which any point on the specimen is observed

to have a maximum amplitude more than twice that of the support points. When specified, resonant frequencies shall be determined either by monitoring parameters, or by use of resonance-detecting instrumentation.

Test Condition D (20 peak) for MIL-STD 202 High Frequency Vibration:

The specimens are tested while de-energized or operating under the load conditions specified. They are  subjected to the vibration amplitude, frequency, range, and duration.

What Amplitude Should Be Used in MIL-202 High Frequency Vibration?

The specimens shall be subjected to a simple harmonic motion. This motion should have an amplitude of either 0.06-inch double amplitude or 20g (peak), whichever is less. The tolerance on vibration amplitude shall be ±10 percent.

What Frequency Range is Appropriate?

The vibration frequency shall be varied logarithmically between the approximate limits of 10 to 2,000 Hz. However, the procedure of method 201 may be applied during the 10-55 Hz band of the vibration frequency range.

What is the Best Sweep Time and Duration?

The entire frequency range of 10 to 2,000 Hz and return to 10 Hz shall be traversed in 20 minutes. This cycle shall be performed 12 times in each of three mutually perpendicular directions (total of 36 times). This is so that the motion shall be applied for a total period of approximately 12 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 method 201 is used for the 10 to 55 Hz band, the duration should equal the duration for this band. Using logarithmic cycling it is approximately 1-1/3 hours in each of three mutually perpendicular directions.

Test Condition E (50g peak) for MIL-STD 202 High Frequency Vibration:

The specimens are tested while de-energized or operating under the load conditions specified. They are subjected to the vibration amplitude, frequency, range, and duration, respectively.

What Amplitude Should Be Used in MIL-202 High Frequency Vibration?

The specimens shall be subjected to a simple harmonic motion. This motion should have an amplitude of either 0.06-inch double amplitude or 50g (peak), whichever is less. The tolerance on vibration amplitude shall be ±10 percent.

What Frequency Range is Appropriate?

The vibration frequency shall be varied logarithmically between the approximate limits of 10 and 2,000 Hz.  However, the procedure of method 201 may be applied during the 10-55 Hz band of the vibration frequency range.

What is the Best Sweep Time and Duration?

The entire frequency range of 10 to 2,000 Hz and return to 10 Hz shall be traversed in 20 minutes. This cycle shall be performed 12 times in each of three mutually perpendicular directions (total of 36 times). This is so that the motion shall be applied for a total period of approximately 12 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 method 201 is used for the 10 to 55 Hz band, the duration should equal the duration for this band. Using logarithmic cycling it is approximately 1-1/3 hours in each of three mutually perpendicular directions.

Test Condition F (20g peak) for MIL-STD 202 High Frequency Vibration:

The specimens are tested while de-energized or operating under the load conditions specified. They are subjected to the vibration amplitude, frequency range, and duration, respectively.

What Amplitude Should Be Used in MIL-202 High Frequency Vibration?

The specimens shall be subjected to a simple harmonic motion. This motion should have an amplitude of either 0.06-inch double amplitude or 20g (peak), whichever is less. The tolerance on vibration amplitude shall be ±10 percent.

What Frequency Range is Appropriate?

The vibration frequency shall be varied logarithmically between the limits of 10 and 3,000 Hz. However, the procedure of method 201 may be applied during the 10-55 Hz band of the vibration frequency range.

What is the Best Sweep Time and Duration?

The entire frequency range of 10 to 3,000 Hz and return to 10 Hz shall be traversed in 20 minutes. This cycle shall be performed 12 times in each of three mutually perpendicular directions (total of 36 times). This is so that the motion shall be applied for a total period of approximately 12 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 method 201 is used for the 10 to 55 Hz band, the duration should equal the duration for this band. Using logarithmic cycling it is approximately 1-1/3 hours in each of three mutually perpendicular directions.

Test Condition G (300g peak) for MIL-STD 202 High Frequency Vibration:

The specimens are tested while de-energized or operating under the load conditions specified. They are subjected to the vibration amplitude, frequency range, and duration specified, respectively.

What Amplitude Should Be Used in MIL-202 High Frequency Vibration?

The specimens shall be subjected to a simple harmonic motion. This motion should have an amplitude of either 0.06-inch double amplitude or 30g (peak), whichever is less. The tolerance on vibration amplitude shall be ±10 percent.

What Frequency Range is Appropriate?

The vibration frequency shall be varied logarithmically between the approximate limits of 10 to 2,000 Hz. However, the procedure of method 201 may be applied during the 10-55 Hz band of the vibration frequency range.

What is the Best Sweep Time and Duration?

The entire frequency range of 10 to 2,000 Hz and return to 10 Hz shall be traversed in 20 minutes. This cycle shall be performed 12 times in each of three mutually perpendicular directions (total of 36 times). This is so that the motion shall be applied for a total period of approximately 12 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 method 201 is used for the 10 to 55 Hz band, the duration should equal the duration for this band. Using logarithmic cycling it is approximately 1-1/3 hours in each of three mutually perpendicular directions.

Test Condition H (80g peak) for MIL-STD 202 High Frequency Vibration:

The specimens are tested while de-energized or operating under the load conditions specified. They are subjected to the vibration amplitude, frequency range, and duration specified in, respectively.

What Amplitude Should Be Used in MIL-202 High Frequency Vibration?

The specimens shall be subjected to a simple harmonic motion. This motion should have a constant amplitude of either 0.06-inch double amplitude or 80g (peak), whichever is less. The tolerance on vibration amplitude shall be ±10 percent.

What Frequency Range is Appropriate?

The vibration frequency shall be varied logarithmically between the approximate limits of 10 to 2,000 Hz. However, the procedure of method 201 may be applied during the 10-55 Hz band of the vibration frequency range.

What is the Best Sweep Time and Duration?

The entire frequency range of 10 to 2,000 Hz and return to 10 Hz shall be traversed in 20 minutes. This cycle shall be performed 12 times in each of three mutually perpendicular directions (total of 36 times). This is so that the motion shall be applied for a total period of approximately 12 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 method 201 is used for the 10 to 55 Hz band, the duration should equal the duration for this band. Using logarithmic cycling it is approximately 1-1/3 hours in each of three mutually perpendicular directions.

Keystone Compliance has been recognized as one of the best high frequency vibration testing labs in the country. Our capabilities include testing to commercial and military vibration lab standards. We use only state of the art test equipment in our high frequency vibration laboratory. Our test engineers understand the nuances of the vibration profiles and vibe testing.

Looking to get a high frequency vibration certification for your product? Talk to our experts to develop a streamlined test plan and receive a professional and affordable quote. Work with certified vibration analysts that understand the requirements of military vibration testing standards. Contact us to learn why so many manufacturers rely on Keystone Compliance for their high frequency vibration compliance needs.

Looking for other MIL-STD-202 compliance tests? Click on a link below to learn more about the other test methods.