Mil-std-167-2a Pdf Verified -
Place control accelerometers on the mounting points. Place response accelerometers on heavy internal components (transformers, contactors, PCBs).
Test three orthogonal axes (X, Y, Z). For most shipboard equipment, the vertical axis (Z) is the most severe. mil-std-167-2a pdf
| Feature | MIL-STD-167-2A | MIL-STD-810H (Method 514) | | :--- | :--- | :--- | | | Navy Shipboard (Surface & Submarine) | General Military (Ground, Air, Sea) | | Frequency Range | 2 Hz to 50 Hz (often extended to 200 Hz) | 5 Hz to 500 Hz+ | | Duration | 2 hours per axis (Typically) | 1 hour per axis (Typical) | | Key Focus | Low-frequency, high-displacement vibration from hull flex | Broadband transport and operational vibration | | Contractual Use | Mandatory for Navy shipboard equipment | Optional unless specified by Navy | Place control accelerometers on the mounting points
The answer is for naval procurement. Here is the difference: For most shipboard equipment, the vertical axis (Z)
If you have a resonance Q-factor above 10, the standard allows "notching" (reducing input amplitude) only at specific frequencies, provided you prove the equipment can survive the amplified response. Do not notch arbitrarily.
Equipment tested for submarines (SSN/SSBN) requires a note that the vibration test is performed at ambient humidity, but the equipment must be designed for 100% condensation. The PDF does not cover this—it is in a complementary NAVSEA instruction. Conclusion: Master the Standard Before You Test The mil-std-167-2a pdf is more than a file; it is a contractually binding requirement for any equipment that vibrates aboard a U.S. Navy vessel. Whether you are testing a pump, a radar array, or a power supply, understanding the distinction between Type I and Type II vibration, securing an official PDF from ASSIST, and executing a proper resonance search will save you from costly test failures and program delays.
Introduction: Why MIL-STD-167-2A Matters In the world of naval engineering and defense contracting, standards are not just suggestions—they are the backbone of system reliability. For equipment destined for U.S. Navy ships and submarines, one of the most referenced—and most misunderstood—documents is MIL-STD-167-2A .
