2B116

a. "Vibration test systems incorporating a digital controller" and employing feedback or closed loop techniques, capable of vibrating a system at an acceleration equal to or greater than 10 g rms between 20 Hz and 2 kHz while imparting forces equal to or greater than 50 kN, measured "bare table";

Digital controllers, combined with specially designed vibration test software, with a "real time control bandwidth" greater than 5 kHz designed for use with systems specified in 2B116.a.;

Vibration thrusters (shaker units), with or without associated amplifiers, capable of imparting a force equal to or greater than 50 kN, measured "bare table", and usable in systems specified in 2B116.a.;

Test piece support structures and electronic units designed to combine multiple shaker units in a system capable of providing an effective combined force equal to or greater than 50 kN, measured "bare table", and usable in systems specified in 2B116.a.