Automobile, aircraft, machinery and delicate ground vibrations can all be replicated with amazing accuracy. Use an accelerometer and your laptop to record the actual motion/vibration waveforms found in the field. Take your field acceleration measurements, and reproduce them on your shaker in your test lab. There is no need to try to approximate your field environment through standard random or sine tests.

Recording Software

Audacity Free Audio Editor and Recorder   http://audacity.sourceforge.net/

Soundcard / data acquisition hardware

Echo Digital Audio Professional Recording Systems: www.echoaudio.com