Time Waveform Replication and Control

Time Waveform Replication and Control (TWRC) allows an exact recreation of a measured field environment on a laboratory shaker system. Measured field data, e.g. from an automotive test track or an aircraft flight run, can be easily imported into the software, and compensated to run on a shaker system.

Uses

• Lab replication of field environments for automotive and military vehicles, aircraft and trains
• Test track vibration, road test vibration, aircraft landing shock, etc.
• Recreating very long events that can be minutes of hours in duration

Features

• Adaptive control for accurate adjustments over the course of long tests
• Closed-loop real-time control (not iterative control)
• Supports a wide variety of data file formats to import a reference waveform
• Flexible pre-processing of imported waveforms including DC offset removal, high and low pass filtering, cut and paste, and compensation for velocity and displacement to make the waveform suitable for use on a shaker system
• Virtually unlimited waveform duration as the reference waveform is read from a disk file in real-time during control
• Looping of  waveforms and schedule of multiple waveforms with cycling
• Option for simultaneous data recording while controlling for a point-by-point record of the test
• Aborts specified at a constant amplitude or point-by-point

Unlike conventional iterative equalisation techniques, TWRC updates and adapts the load transfer function on-line. This capability reduces test time and enhances accuracy.

TWRC supports a wide range of data file types so the waveforms to be replicated can come from practically any data acquisition system or from data created artificially (e.g., from a spreadsheet program like Excel).

Field measurements such as a vehicle’s road vibration can be replicated on a laboratory shaker system for durability testing of parts and vehicle electronics.