Fastenings and internal mechanisms are proven to withstand severe, multi-axis fatigue.
MIL-STD-167-2A defines critical vibration testing requirements for shipboard reciprocating machinery and propulsion systems, specifically covering torsional, longitudinal, and lateral vibrations. Validated in February 2023, the standard remains mandatory for ensuring equipment survival against intense naval operational stresses. For the full standard and update notices, visit DLA Quicksearch ASSIST-QuickSearch Basic Search (.mil)
MIL-STD-167-2A: Mechanical Vibrations of Shipboard Equipment mil-std-167-2a pdf
┌───────────────────────────────────────┐ │ MIL-STD-167 Standard │ └───────────────────┬───────────────────┘ │ ┌──────────────────────────┴──────────────────────────┐ ▼ ▼ ┌─────────────────────────────────┐ ┌─────────────────────────────────┐ │ MIL-STD-167-1 │ │ MIL-STD-167-2 │ ├─────────────────────────────────┤ ├─────────────────────────────────┤ │ • Type I: Environmental │ │ • Type III: Reciprocating │ │ • Type II: Internally Excited │ │ • Type IV: Torsional Shafting │ │ │ │ • Type V: Lateral/Longitudinal │ └─────────────────────────────────┘ └─────────────────────────────────┘
: It applies to machinery where standard vibration profiles might not be sufficient, such as antennas or large-scale machinery items. Key Vibration Classifications Fastenings and internal mechanisms are proven to withstand
This covers general environmental vibration testing on a shake table. It simulates the background vibrations a piece of equipment will experience just by being bolted to a ship's hull. It also covers balancing requirements for rotating machinery.
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: Defining acceptable stress levels within the operating speed range of propulsion systems to prevent fatigue and failure. Testing Procedures
Side-to-side vibrations affecting the propulsion shafting. Key Testing Procedures
While MIL-STD-167-2A focuses on vibration, it is often paired with MIL-S-901D