Load testing apparatus

Provided are a structure testing apparatus 10, a controller for such an apparatus and a method for controlling a structure testing apparatus in which operation of a direct drive electromagnetic actuator 40 is continuously auto-tuned during a test, so that the test load applied to a specimen 50 durin...

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Bibliographische Detailangaben
Hauptverfasser:	PAUL HAYFORD, BEN JEPPESEN
Format:	Patent
Sprache:	eng
Schlagworte:	CONTROL OR REGULATING SYSTEMS IN GENERAL CONTROLLING FUNCTIONAL ELEMENTS OF SUCH SYSTEMS INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS PHYSICS REGULATING TESTING
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Beschreibung
Zusammenfassung:	Provided are a structure testing apparatus 10, a controller for such an apparatus and a method for controlling a structure testing apparatus in which operation of a direct drive electromagnetic actuator 40 is continuously auto-tuned during a test, so that the test load applied to a specimen 50 during the test is the correct, desired load according to the current specimen 50 parameters including stiffness. Forward and feedback control gains are repeatedly recalculated during the test in response to monitored specimen parameters, as measured by extensometer 100. One or more sensors 110 measure the position and velocity of the actuator 40.