Vibration Table Modal Survey
Environmental Stress Screening System:

Navcon engineers conducted a dynamic characterization of an Environmental Stress Screening - Vibration Impact Table. The project included a linearity study, a frequency response survey, an impact modal test, an operational deflection shape survey and a FRF-ODS survey. The linearity and modal data was acquired with a HP 35670A analyzer. The operational deflection shape and FRF-ODS data was acquired using a HP 3566A analyzer. The measurement grids included 81 tri-axial accelerometer locations and one (force - modal or response - ODS) reference location. The test results were used in the design of test fixtures for environmental stress screen tests.

Vibration Impact Table - Sample Mode Shape Plot: Mode 9, 714 Hz.

The photos to the left show the Environmental Stress Screening System. It consists of an Environmental Chamber and a Vibration Impact Table


The mode shape plot on the left is the ninth structural mode identified during the modal test. The dashed line shows the undeformed vibration table top. The solid line is the deformed shape.

Vibration Impact Table - Sample Mode Shape Movie: Mode 9, 714 Hz.

The digital movie of Mode 9 can be played by placing the cursor in the cell and pressing the right mouse button. Browser options (Multimedia options) must be setup to allow animation of AVI files. The AVI file can be downloaded. This digital movie was created using MES'cope by Vibrant Technology. Please give us a call if you have problems animating or downloading (714-441-3488). The dashed line shows the undeformed vibration table top. The solid line is the animated mode shape.