Acceleration - Acceleration (MIL STD 810 G - Test Method 513.6) Tests

Aviation and Space Tests

Acceleration - Acceleration (MIL STD 810 G - Test Method 513.6) Tests

EUROLAB Laboratory performs MIL STD 810 G – Test Method 513.6 – Acceleration tests in its accredited laboratory, acceleration is all about sustaining loads on your box or structure, whatever the case. In acceleration, you're looking for things like permanent damage and drift. There are some tests that require acceleration while the box is running, while others are just structural.

Acceleration - Acceleration (MIL STD 810 G - Test Method 513.6) Tests

The best way to think about acceleration is when you're in space training and astronauts cruising around in the G4 simulator. Acceleration is pretty much like that, but that's one of the cooler features because they're actually talking about rocket sleds on rails. In EUROLAB, acceleration is reported as continuous loading and positive if a unit is structurally able to withstand G loads. There are three procedures: operational, structural and impact loading.

For operational testing, the goal is to determine if it works during testing. The structural procedure evaluates if anything breaks during crash safety tests to see if the unit can be held securely in the mounting structure during a crash.

It is usually three mutually exclusive axes or three perpendicular axes. We test anywhere between half G and 12 G, or three G and 40 G, depending on which procedure is being tested.

These tests evaluate:

  • Are the effects reflected?
  • Do circuit boards change shape or short circuit?
  • Is there any fatigue or structural damage to the system or is there any problem with the box?

These tests help determine structural integrity based on whether a unit can withstand loads and how robust the box is in the application.

Acceleration

As discussed in this method, acceleration is a load factor applied slowly enough and held constant for long enough for the material to have enough time to fully dissipate the resulting internal loads (inertia load, load "g"). this dynamic (resonance) response of the material is not stimulated. Where loads do not meet this definition, more complex analysis, design and testing methods are required.

aerodynamic loads

During platform operations, the material that is mounted in such a way that any or all of the surfaces are exposed to aerodynamic flow is subjected to aerodynamic loads in addition to inertial loads. This method is generally not applicable for these situations. Material subjected to aerodynamic loads should be designed and tested for worst-case combinations of these loads. This usually requires more sophisticated testing methods often associated with body structural (static and fatigue) testing.

acceleration and shock

Acceleration loads are expressed in terms of load factors, often labeled as “g” loads, although they are dimensionless. Shock environments (Methods 516.6 and 517.1) are also denoted in terms of “g”. This sometimes leads to the false assumption that acceleration requirements can be met by shock tests and vice versa. Shock is a rapid movement that stimulates the dynamic (resonance) response of the material, but with little overall deviation (stress). Shock test criteria and test methods cannot be used as a substitute for acceleration criteria and test methods, and vice versa.

Procedure I – Structural Test

  • Step 1. With the test item installed as in paragraph 4.5.1.2, speed up the centrifuge to induce the g level specified in the test item specified in paragraph 2.3 and Table 513.6-I for the specific test item orientation. Maintain this g level for at least one minute after the centrifuge rpm stabilizes.
  • Step 2. Stop the centrifuge and inspect the test item as specified in paragraph 4.5.1.1.
  • Step 3. Operationally test and inspect the test item as specified in paragraph 4.5.1.1. If the test item does not work as intended, see paragraph 5 for analysis of results and follow the guidance in paragraph 4.3.2 for test item failure.
  • Step 4. Repeat this test procedure for the remaining five test directions specified in Paragraph 4.5.1.2a, Step 2.
  • Step 5. After completing the tests in the six test directions, remove the test item from the centrifuge and perform a final operational check and physical inspection if necessary. See paragraph 5 for analysis of results.

Procedure II – Operational Test

Centrifugal

  • Step 1. With the test item installed as in paragraph 4.5.1.2, operationally test and inspect the test item as specified in paragraph 4.5.1.1.
  • Step 2. While the test item is running, turn the centrifuge to the speed required to induce the g level specified in the test item as determined in paragraph 2.3 and Table 513.6-II for the specific test item orientation. Maintain this g level for at least one minute after the centrifuge rpm stabilizes. Perform an operational check and document the results. If the test item does not work as intended, follow the guidance in paragraph 4.3.2 for test item error.
  • Step 3. Stop the centrifuge and functionally check and inspect the test item as specified in paragraph 4.5.1.1. If the test item does not work as intended, see paragraph 5 for analysis of results.
  • Step 4. Repeat Steps 4.5.1.2-2 for the remaining five directions outlined in Paragraph 1a, Step 3.
  • Step 5. After completing the tests in the six test directions, remove the test item from the centrifuge and perform a final operational check and physical inspection if necessary. See paragraph 5 for analysis of results.

Track/rocket powered sled

  • Step 1. With the test item installed as in paragraph 4.5.1.2, operationally test and inspect the test item as specified in paragraph 4.5.1.1.
  • Step 2. While the test item is running, accelerate the sled to the level required to provide the g level specified on the test item as determined in paragraph 2.3 and Table 513.6-II for the specific test item orientation. Perform a performance check while the test item is subjected to the specified g level. Document the results.
  • Step 3. Evaluate the test run parameters and determine if the required test accelerations have been achieved.
  • Step 4. Repeat the test run as needed to demonstrate acceptable performance of the test item while under the required test acceleration. Document the test run parameters.
  • Step 5. Repeat this test procedure for the remaining five test directions specified in paragraph 4.5.1.2a, Step 2. After completing the tests in the six test directions, operationally check and inspect the test item according to paragraph 4.5.1.1. See paragraph 5 for analysis of results.

Procedure III - Crash Hazard Acceleration Test

  • Step 1. With the test item installed as in paragraph 4.5.1.2, bring the centrifuge to the speed required to induce the g level specified in the test item as determined in paragraph 2.3 and Table 513.6-III for the specific test item orientation. Maintain this g level for at least one minute after the centrifuge rpm stabilizes.
  • Step 2. Stop the centrifuge and inspect the test item as specified in paragraph 4.5.1.1.
  • Step 3. Examine the test item as specified in paragraph 4.5.1.1.
  • Step 4. Repeat this test procedure for the remaining five test directions specified in Paragraph 4.5.1.2a, Step 2.
  • Step 5. After completing the tests in the six test directions, examine the test item as specified in paragraph 4.5.1.1. See paragraph 5 for analysis of results.

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