MTS Series 793 Controller User Manual
Page 60
MTS Series 793 Controller Overview
About Compensators
Operation Concepts
60
Amplitude and Phase
Control (APC)
The Amplitude and Phase Control (APC) compensator monitors feedback from
sine and sine tapered commands for amplitude roll-off and phase lag. APC works
well when you need to control the amplitude of the fundamental frequency
component.
APC provides the following benefits:
•
Boosts the command amplitude if roll-off is detected
•
Alters the command phase if phase lag is detected
Peak/Valley
Compensation (PVC)
Peak/Valley Compensation monitors cyclic command feedback for any
amplitude roll-off or mean-level divergence. PVC is typically used in cyclic or
block cyclic tests with >10 cycles per block, and is widely used compensator for
cyclic and block cyclic durability testing.
PVC provides the following benefits:
•
Corrects for peaks and mean level in cyclic waveforms
•
Works with linear and non-linear specimens.
Peak Valley Phase
Control (PVP)
The Peak/Valley Phase (PVP) compensator combines amplitude and phase
(APC) with Peak/Valley Compensation (PVC) algorithms to improve the
amplitude and phase tracking of the command/feedback. PVP corrects for phase
as well as amplitude and mean
PVP is important for multi-channel tests in which phase relationships must be
maintained, and in which the specimen is pre-loaded or the feedback waveform
may be distorted
PVP is typically used in multichannel block cyclic (>10 cycles per block) tests in
which phasing and mean levels must be compensated, in addition to amplitude.
Adaptive Inverse
Control (AIC)
AIC is a linear compensation technique that senses the frequency content of the
drive signal, automatically generates an inverse filter, and then filters the
command to achieve the desired response.
AIC provides the following benefits:
•
Uses an inverse model to improve tracking in linear systems
•
Compensates for amplitude and phase, and matches signal shape
AIC is most effective with random or time history signals with broad-band
frequency content