GJB150.12A-2009, titled "Environmental Testing Methods for Military Equipment – Laboratory Part 12: Sand and Dust Test," outlines specific procedures for simulating sand and dust conditions in a controlled laboratory environment. One of the key steps in this test is the sand blowing procedure, which is critical to evaluating the durability and performance of military equipment under harsh environmental conditions.
1. The test specimen should be positioned at an appropriate distance from the sand injection point, ensuring that it is exposed to the simulated sand flow as specified in the technical documentation. The wind speed must also be adjusted according to the requirements outlined in the relevant standards.
2. Before starting the sand exposure, the specimen needs to be stabilized at the temperature specified in section 4.3.3.3 of GJB150.12A-2009. This ensures that the test conditions are consistent and representative of real-world scenarios.
3. The sand supply system should be calibrated to achieve the desired sand concentration or weight flow rate, based on pre-test calibration results. This step is essential to ensure accurate and repeatable testing conditions.
4. Once all conditions are set, the test should be conducted for the duration specified in the technical documentation. If required, the test specimen should be reoriented every 90 minutes to ensure that all vulnerable surfaces are exposed to the sand flow. This helps in identifying potential weaknesses in different areas of the equipment.
5. If the test piece is required to operate during the test, its functionality should be checked during the final hour of the test. Any observed anomalies or failures should be recorded for further analysis. Otherwise, proceed to the next step.
6. After the test, the specimen should be returned to standard atmospheric conditions. Any accumulated sand should be carefully removed using methods such as brushing, wiping, or shaking—techniques that would be used in actual field operations. Extra care must be taken to avoid introducing additional sand into the equipment during this process.
7. Following the removal of sand, the test piece should be inspected according to the technical documentation. All observations and findings should be thoroughly documented for future reference.
8. A visual inspection of the test specimen is necessary to assess the effects of abrasion, clogging, and any signs of sand penetration. These observations should be recorded in detail to evaluate the overall impact of the sand and dust exposure on the equipment.
By following these detailed procedures, military equipment can be effectively tested for its resistance to sand and dust environments, ensuring reliability and performance in challenging operational conditions.
Electric Shaver,3 In One Shaver Set,Rechargeable Electric Shaver,Electric Floating Shaver
ZHEJIANG SHENGFA ELECTRIC APPLIAMNCES CO.,LTD , https://www.sfelectricappliances.com