Discussion:  MIL-STD-810 establishes a requirement to limit cross axis acceleration to 0.45 times the axis under test acceleration.  This calls for installing accelerometers in both axis orthogonal to the primary axis or using a multi-axis accelerometer.  If the cross axis vibration is greater than 3.5dB below the primary axis acceleration, then the cause needs to be determined.  If the cause is related to the vibration test fixture inducing the cross axis issue, then the fixture should be corrected to eliminate or move the resonant frequency outside the test range.  If the test article is the source, you may need to limit the drive spectrum or consider multi-axis testing.

Article Reference ID: DYK00006

Posted in: Did You Know? MIL-STD-810