MIL-STD-167-1 and MIL-STD-167-2
These standards that date from 1974 are an attempt to provide a threshold vibration level as a function of frequency for acceptance testing of rotating machinery. MIL-STD-167-1 covers internally excited vibration of all rotating equipment except reciprocating machinery, and MIL-STD-167-2 covers reciprocating machinery, propulsion systems and shafting. They have been used for many years, and are generally considered to be quite outdated. They are based on a displacement (mils peak) spectrum, which is actually equivalent to a constant velocity of 0.13 inches per second (107 VdB) above 1200 RPM. These standards continue to be used as a rough reference for acceptable vibration levels for medium sized simple machines such as electric motor pumps, but they should not be used as any absolute standard.
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