MTS Series 793 - Manual (Page 80)

Basic and MultiPurpose
TestWare Station Manager Station Builder
• PVP
Note:
Other compensators are also available (besides the ones that are purchased as an option).
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. The APC compensator:
• Boosts the command amplitude if roll-off is detected.
• Alters the command phase if phase lag is detected.
APC works well when you need to control the amplitude of the fundamental frequency component.
Note:
An extended capability version of AIC (AICX) is available for controllers that use Series 494 Hardware.
Adaptive Inverse Control (AIC)
The AIC compensator 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.
The APC compensator:
• Uses an inverse model to improve tracking in linear systems.
• Compensates for amplitude and phase, and matches signal shape.
• Is most effective with random or time history signals with broad-band frequency content.
AIC is typically used in tests on linear specimens where road profiles developed on a separate system must
be accurately reproduced without having to iterate.
AIC is also used on fast sine sweeps, particularly when the sweep rate is too fast (>1Hz/s) for APC, and on
any component being tested with random or time history signals on a linear system.
Arbitrary Level Control (ALC)
The ALC compensator is an adaptive compensation technique that improves the tracking accuracy of spectrum
profiles played out with the MultiPurpose TestWare application. This technique is also known as “from-to
matrix compensation.” The ALC compensator:
• Works with linear or nonlinear specimens.
• Can be used with cyclic waveforms or random profiles.
• Provides the option to adjust the test frequency to suit mechanical system capability (optimizes frequency
and amplitudes to minimize test time).
Peak Valley Phase Control (PVP)
The Peak/Valley Phase Control (PVP) combines amplitude and phase (APC) with Peak/Valley Compensation
(PVC) algorithms to improve the amplitude and phase tracking of the command and sensor feedback. PVP
80 MTS Series 793 Control Software
Station Builder