The Viton vibrational absorbers (VA's) were added to the sleeve of the mated Quad in the LVEA last Friday.  The VA's were clamped to each of the four posts of the sleeve of the Quad in a "spiral" configuration which means they were stepped up incrementally around the Quad. An accelerometer was inserted into each VA and tap tested using a B&K hammer.  The hammer's software plotted each impulse response and confirmed the hammer had not "double-hit" the surface.  

First, each VA was tapped individually parallel and perpendicular to the orientation of the accelerometer in the VA.  Each attached "vibration_absorber_##" pdf file has the parallel response on the first page and the perpendicular on the second.  The "##" corresponds to the S/N of the VA. Here we simply have images of the plots for analysis.

Next, 3 locations on the Upper Structure, 4 locations on the Lower Structure, and 4 locations on the Sleeve Structure were chosen for tap testing.  The impulse responses are plotted along with a picture showing their locations on the assembly.  The last image is a close-up of one of the VA's.

Each plot has each of the X,Y, and Z DoF responses of the accelerometer.  Exporting the data into text files was discovered after these tests were ran so we would not have to rely on images of the responses. The ability to process the data via MATLAB is currently in development.