1. Low frequency vibrations
During transport and distribution, a pack is submitted to vibrations. Vibrations tests enable us to check the resistance of the packaging to these constraints. They also offer the possibility to compare the difference in behaviour of various packaging solutions : either qualitatively through classic tests or quantitatively by instrumenting the test. Indeed, the packaging, through its design, may amplify or dampen the movements to which it is submitted.
In the laboratory, the tests are performed by placing the packaging on a vibrating table.
The fixed low frequency vibration test is carried out on a mechanical vibrating table which recreates the most powerful transport frequencies.
The low frequency vibration systems only recreate one part of the transport vibration spectrum. For this reason it is interesting to perform some random vibration tests.
2. Random vibrations
Road, rail and air transport all produce random vibrations. It is a combination of frequencies and amplitudes which vary constantly with time.
The random vibration tests are tests which recreate vibrations encountered in transport conditions. These tests are carried out on electro-dynamic equipment with a piloting system.