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 MIL-STD-167-2A standard was established to address the issues related to vibration and noise on naval ships. Excessive vibration and noise can lead to reduced performance, increased wear and tear on equipment, and compromised safety. The standard aims to provide a framework for designing, testing, and maintaining shipboard machinery to minimize vibration and noise levels. mil-std-167-2a pdf
Independent and internal testing facilities utilize the PDF to construct test plans, calibrate shaker tables, and issue compliance certificates. If you have a resonance Q-factor above 10,
Test three orthogonal axes (X, Y, Z). For most shipboard equipment, the vertical axis (Z) is the most severe. Excessive vibration and noise can lead to reduced