SJ 21140.6-2016 in English
VALIDSafety design requirement for military command and control equipments. Part 6：En讨ronmentworthinessdesign
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Introduction
Analysis of the core content of the standard
This standard specifies the adaptive design specifications for military command and control equipment in natural and induced environmental conditions, focusing on solving the environmental hazard protection issues of equipment throughout its life cycle, including storage, transportation, and use.
Environmental hazard classification system
| Hazard type | Typical manifestation | Degree of impact |
|---|---|---|
| Natural environment | Temperature and humidity changes/Dust/Salt spray | ★★★ |
| Induced environment | Electromagnetic interference/Mechanical vibration | ★★★★ |
Key technical requirements
5.2 Temperature protection design
A dual protection mechanism is required:
- High temperature environment: configure automatic power-off protection device (critical value ≤85℃)
- Low temperature environment: select cold-resistant materials (maintain elasticity at -40℃)
5.5 Electromagnetic compatibility design
A certain type of on-board command system adopts three layers of protection:
- RF shielding layer (attenuation ≥60dB)
- Filter circuit (cut-off frequency 10MHz)
- Equipotential grounding design
Implementation Suggestions
Design Phase
It is recommended to adopt the FMEA analysis method, focusing on the following evaluation:
| Environmental stress | Failure mode | Detection method |
| Temperature cycling | Solder point fracture | X-ray inspection |
Verification phase
Should be carried out in accordance with GJB150A standard:
- Damp heat test (40℃, 95%RH, 240h)
- Vibration test (5-500Hz, 0.04g²/Hz)
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