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A torque moment is simulated in a rotary testing stand for test samples by providing a feed-back closed loop control circuit for controlling a torque moment generator. The feed-back control circuit generates a feed-back control signal by differentiating an angular velocity signal derived from a torq

A torque moment is simulated in a rotary testing stand for test samples by providing a feed-back closed loop control circuit for controlling a torque moment generator. The feed-back control circuit generates a feed-back control signal by differentiating an angular velocity signal derived from a torque applying shaft and passing the differentiated signal through a proportional time element that has a controllable, variable time constant. Both the differentiating circuit and the time circuit are preferably controlled by a difference signal that represents a difference between the inertia moment of the test sample and the inertia moment of the testing stand. The output signal of the time circuit is compared in a comparator with an actual torque signal. The output of the comparator provides a rated or reference torque signal that is then used for adjusting the output of the torque generator to produce the required simulated torque load.

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A method for simulating a mass in a testing stand including a load generator having a control input and a load output connectable in a force transmitting manner to a sample to be tested, comprising the following steps: (a) sensing a first actual velocity representing signal corresponding to an actua

A method for simulating a mass in a testing stand including a load generator having a control input and a load output connectable in a force transmitting manner to a sample to be tested, comprising the following steps: (a) sensing a first actual velocity representing signal corresponding to an actual velocity of said load output, (b) producing a difference signal (DqqF) of said sample and from a known mass inertia moment (qP) of said testing stand, (c) differentiating said first actual velocity representing signal and said difference signal (DqR); (d) controlling with said difference signal (DqR) through said controllable time element (10) to produce a time varied rated load value, (f) sensing from said load output a second signal representing an actual load value from said load output, (g) comparing said time varied rated load value with said actual load value to produce a control signal representing a simulated mass, and (h) controlling said load generator with said control signal to produce a corrected torque moment that represents a load torque moment corresponding to said simulated mass which is applied to said sample to be tested.