| Test Type | Frequency Range | Amplitude | Duration | |-----------|----------------|-----------|----------| | | 2 Hz – 50 Hz (sweep log or linear) | 0.02 in (0.5 mm) displacement or 0.5g acceleration (whichever is less) | 2 hours per axis (3 axes) | | Type II – Internally Excited | Based on equipment’s own operating speeds (e.g., 10% to 120% of rated RPM) | Varies with rotating mass & imbalance | Until resonance effects are characterized |
: It generally does not cover specialized equipment like antennas, weapons systems subject to shock loading (covered by MIL-S-901 ), or equipment on ships with non-conventional propulsion like water jets. Types of Vibration Covered mil-std-167-2a pdf
MIL-STD-167-2A defines three specific types of vibration (often referred to as Types III, IV, and V) that are distinct from the general environmental vibrations in Part 1: | Test Type | Frequency Range | Amplitude
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. The standard provides detailed procedures for analyzing and
The standard provides detailed procedures for analyzing and testing equipment to prevent catastrophic fatigue failure. Analysis Coverage
: Guidance on conducting vibration measurement and control to mitigate excessive alternating thrust. Where to Find the PDF