Standards for Mechanical Systems

When designing mechanisms, especially for military applications, adherence to specific standards and requirements is of critical importance. Military standards provide guidance on issues such as security, durability, environmental compatibility, logistical supportability, and performance.

General Standards to Be Complied With

MIL-STD (Military Standards – USA)

U.S. military standards are among the most widely used systems in standardization. Some of these include:

• MIL-STD-810 (Environmental Engineering Considerations)
• • Defines the environmental durability of the mechanism.
  • Test conditions: temperature, humidity, vibration, dust, rain, salt fog, shock, icing, etc.
  • For example, if the mechanism is intended to operate in desert, polar, or marine environments, it must undergo different tests.
• MIL-STD-1472 (Human Engineering)
• • Establishes ergonomic and user-friendly design principles.
  • Particularly important for mechanisms involving human interaction (e.g., manually operated systems).
• MIL-STD-882 (System Safety)
• • Defines safety engineering processes.
  • Risk analysis and safe design principles are controlled under this standard.

NATO STANAG (Standardization Agreements)

These are common standards used by NATO member countries. Examples include:

• STANAG 2895: Environmental conditions (temperature, humidity, altitude, etc.)
• STANAG 4370 (AEC): NATO Environmental Testing (similar to MIL-STD-810 but optimized for NATO)

Test and Material Standards

• MIL-STD-202 / MIL-STD-883: For durability and reliability of electronic components.
• ASTM / ISO / DIN: Compliance with international standards may also be required, particularly when selecting materials and fastening elements.

Logistics and Maintenance Standards

• MIL-STD-1388 / S1000D: Design for Integrated Logistics Support (ILS).
• The mechanism must comply with these standards in terms of disassemblability, replaceability, and ease of maintenance.

Packaging and Transportation

• MIL-STD-2073: Packaging requirements for military products.
• MIL-STD-129: Labeling and identification.

Standards to Be Complied With in Unmanned Aerial Vehicles

Environmental Durability – MIL-STD-810 & STANAG 4370

Components of unmanned vehicles often operate under harsh conditions. In particular:

• Vibration and shock testing (during flight, ground/terrain operation)
• Temperature variations and humidity (high altitude, tropical/desert environments)
• Dust, mud, and water resistance (especially for ground vehicles)
• Salt fog (for maritime platforms)

Electronic Compatibility and Security

• MIL-STD-461 (Electromagnetic Compatibility – EMC)
• • Emissions from components must not interfere with other systems.
  • Components must also be protected against external electromagnetic interference (EMI).
• MIL-STD-704 (Power Systems – for Aircraft)
• • Ensures compatibility of electrical interfaces with power systems (input voltage, harmonics, etc.)

Cyber and Hardware Security

• NIST 800-53 / MIL-STD-1789 (Software Security)
• • Critical for software and firmware security.
  • Especially important for externally controllable components (sensors, RF links, etc.).
• MIL-STD-1553 / 1760 / CAN MIL-STD
• • Compliance with data communication protocols and onboard aircraft communication systems (if applicable)

Mechanical Durability & Modularity

• MIL-HDBK-5 / MIL-HDBK-17
• • Material selection for composites and metals, strength calculations
• NATO STANAG 4586 (UAV Control Interface)
• • Compliance with this STANAG is important if the mechanism is related to a control component or flight system.

Maintenance, Repair, and Supportability

• MIL-STD-1474 (Noise Level)
• • In some cases, acoustic profile is critical (e.g., in stealth missions).
• S1000D / MIL-STD-1388
• • Documentation standards for modular design and ease of maintenance

Key Military Standards for a Gimbal Folding Mechanism

Mechanical Durability & Functionality

In such moving parts, vibration, shock, and fatigue are critical factors.

• MIL-STD-810H
• • Method 514.8 – Vibration → Testing against flight-induced vibrations
  • Method 516.8 – Shock → Testing against sudden movements or drops
  • Method 501.7 & 502.7 – High/Low Temperature
  • Method 505.7 – Solar Radiation (exposure to sunlight – especially relevant if transported externally)
• MIL-HDBK-5 or MMPDS
• • For material selection and strength calculations (particularly for aluminum, titanium, composites, etc.)
• MIL-STD-1472
• • If manual folding is possible, ergonomic considerations are important (e.g., for maintenance personnel intervention)

Moving Part and Actuator Compatibility

• MIL-STD-1798 / RTCA DO-160
• • Suitability of actuators, servo motors, and similar components for aerospace applications
• MIL-STD-1695 / STANAG 4738
• • For electromagnetic compatibility (EMI/EMC) if electric motion systems are present (e.g., DC motors)

Aerodynamic and Folding Performance

• MIL-A-8860 / MIL-F-8785 (Aircraft aerodynamics – for reference)
• • Air resistance and aerodynamic effects created by the gimbal in both open and closed positions must be considered
  • It is particularly important that the gimbal does not remain open during takeoff or landing

Security and Locking Mechanism

• MIL-STD-882E – System Safety
• • Systems to prevent accidental opening or release of moving parts
  • Mechanical or electronic verification is recommended when the mechanism is locked

Environmental Conditions

• STANAG 4370 (AEC)
• • NATO environmental conditions standard – equivalent to MIL-STD-810
• IP67 / MIL-STD-810 Method 506.6 (Rain)
• • Resistance to dust and water (critical for mechanisms operating in open environments)