AcQuisition Technology Quad M-module Carrier i4000 User Manual download pdf (Page 7)

Accurate Test Control

FlexTest controllers support adaptive control compensation

techniques, calculated channels, cascade control, and

interoperability with RPC soware to adapt actuator controls

to meet test requirements for your specimen and achieve

accurate results.

Compensation Techniques

Each compensation technique is optimized to meet specic

application needs. ese techniques enable you to more

accurately control your tests. You can realize desired end levels

even while specimen characteristics change.

NULL PACING » ensures desired levels

are reached on initial cycle without over-programming.

PEAK VALLEY CONTROL (PVC) » adapts as specimen compliance

changes to ensure peaks and valleys are maintained for any

constant amplitude periodic waveform.

PEAK VALLEY PHASE (PVP) CONTROL » adapts for phase as well

amplitude for multi-channel cyclic tests. PVC can correct

for phase even with distorted waveforms.

ARBITRARY END LEVEL CONTROL (ALC) » can adapt for linear or

non-linear specimens with periodic or random waveforms.

ADAPTIVE INVERSE CONTROL (AIC) » can be applied to any

waveform, including random proles or RPC time history

les in linear systems. An example of how AIC can greatly

improve tracking to desired command is illustrated in the

two charts below.

With Adaptive Compensation, the command is adjusted in real

time so the achieved response matches a target signal.

All of these compensation techniques are useful in certain test

applications. ey work for any control mode, including

dual-mode control.

Without AIC With AIC

Calculated Channels

e FlexTest control system enables you to easily dene

calculations from input signals. Available mathematical functions

include: +, -, x, /, cos, exp, ln, log, power, sin, tan, and time. It is

possible to use one dened calculation in another calculation.

Cascade Control

With optional Cascade Control you dene feedback signals for

each of two control loops on one actuator. e command to the

outer loop uses one signal (e.g. load) while most of the actual

control is performed by the inner loop with the other signal

(e.g. stroke). is enables better tuning and system response in

cases where the specimen stiness varies signicantly as a

function of temperature or wear.

Interoperability with RPC

FlexTest control systems can also interoperate with RPC

soware – either through networking or by having the RPC

soware reside on and run from the FlexTest control system PC.

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AcQuisition Technology Quad M-module Carrier i4000 User Manual Page 7

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