根据楼主分享的GJB的封面上的英文“sand and dust test”上网看看, 偶然发现GJB 150.12A-2009中之7.2.1与美国军标MIL-STD几乎一样:
BLOWING DUST: MIL-STD 810F - Method 510.4.Para 4.2.2 Procedure I
· Step 1. With the test item in the chamber, adjust the test section temperature to standard ambient conditions and the air velocity to the required value, determined from the test plan. Adjust the test section relative humidity to less than 30% and maintain it throughout the test.
· Step 2. Adjust the dust feed control for a dust concentration of 10 ±7 g/m3.
· Step 3. Unless otherwise specified, maintain the conditions of Steps 1 and 2 for at least 6 hours. If required, periodically reorient the test item to expose other vulnerable faces to the dust stream.
· Step 4. Stop the dust feed. Reduce the test section air velocity to approximately 1.5 m/s and adjust the temperature to standard ambient conditions or as otherwise determined from the test plan.
· Step 5. Maintain the step 4 conditions for 1 hour following test temperature stabilization.
· Step 6. Adjust the air velocity to that used in Step 1 and restart the dust feed to maintain the Dust concentration as in Step 2.
· Step 7. Continue the exposure for at least 6 hours or as otherwise specified. If required, operate the test item in accordance with the test plan.
· Step 8. Allow the test item to return to standard ambient conditions, and the dust to settle.
· Step 9. Remove accumulated dust from the test item by brushing, wiping or shaking, taking care to avoid introduction of additional dust or disturbing any which may have already entered the test item. Do not remove dust by either air blast or vacuum cleaning unless these methods are likely to be used in service.
· Step 10. Perform an operational check in accordance with the approved test plan, and document the results for comparison with pretest data.
· Step 11. Inspect the test item for dust penetration, giving special attention to bearings, grease seals, lubricants, filters, ventilation points, etc. Document the results.
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