Monday, June 29, 2009

TAP TESTS

To get good coherence/results:
1) Use Delrin hammer tip. This gets more energy in lower frequencies. Brass does not.
2) If you move the hammer around, this generates a signal from the load cell!! SO...KEEP THE LOAD CELL AS STILL AS POSSIBLE!
3) Tape the accel cable to the string holding the beam.... I'm not actually sure this makes much of a difference but it is cleaner that way (the cable isn't wobbling around after each hit).