Loose Load Testing also goes by names such as “Bounce Testing” and “Fixed Displacement Vibration”. The test was conceived in the early days of package testing in an attempt to duplicate the negative effects of vehicle vibration, primarily over the road truck. The apparatus consists of a horizontal platform mounted on an offset cam that results in circular synchronous motion when viewed from the side of the platform. The cam mount is driven by a variable speed motor and the displacement is fixed at one inch peak-peak.
To conduct the test, the package under test is placed on the platform. The speed of rotation of the drive is increased slowly until the package leaves the surface of the platform by a small amount. This speed is maintained for the duration of the test which is typically 15 to 60 minutes.