In addition to the three major test types of Sine, Random and Shock, Crystal Instruments also offers Time Waveform replication, or TWR. This is a method to exactly recreate, or replicate, a vibration in its time waveform format on a shaker system. The data is typically taken from a field environment. The data is typically taken from a field environment. TWR allows engineers to accurately reproduce the data collected in the field.
For more details about Time Waveform Replication Testing: https://www.crystalinstruments.com/time-waveform-replication