Vibration

Purpose of Tests

1. Develop materiel to function in and withstand the vibration exposures of a life cycle including synergistic effects of other environmental factors, materiel duty cycle, and maintenance.

2. Verify that materiel will function in and withstand the vibration exposures of a life cycle.

Effects of Vibration

• Loose fasteners/components

• Intermittent electrical contacts.

• Electrical shorts.

• Failed components.

• Optical or mechanical misalignment.

• Cracked and/or broken structures

• Excessive electrical noise.etc

Vibration types and Procedure

Procedure I - General Vibration

• Procedure I for those cases where a test item is secured to a vibration exciter and vibration is applied to the test item at the fixture/test item interface as per the standard

Procedure II - Loose Cargo Transportation.

• This procedure for materiel to be carried in/on trucks, trailers, or tracked vehicles and not secured to (tied down in) the carrying vehicle.

Procedure III - Large Assembly Transportation.

• This procedure is intended to replicate the vibration and shock environment incurred by large assemblies of materiel installed or transported by wheeled or tracked vehicles.

Procedure IV - Assembled Aircraft Store Captive Carriage and Free Flight.

Apply Procedure IV to fixed wing aircraft carriage and free flight portions of the environmental life cycles of all aircraft stores, and to the free flight phases of ground or sea launched missiles.