SynopsisA method of simulating any load would be very useful for the testing of many power drives. The paper examines three feedback-controlled systems whereby inertia loads can be simulated without using flywheels. One system, which has been found to be of a type suitable for the simulation of train loads for laboratory studies of the utilisation and control of traction motors, is described in detail. List of principal symbolsA = transfer function of the equation-of-motion solver, excluding any pure integration factor a = transfer-function parameter controlling the stabilisation of the system when simulating very small inertias; ideally a. = K D -torsional-damping coefficient E -armature e.m.f. e = error voltage / = moment of inertia K = torque-transducer constant . , « • • , d p = differential operator -5 = torsional stiffness T = torque 6 = angular deflection u = angular speed # = angular acceleration V = voltage co -angular frequency Y = transfer function of the machine control system Z = feedback voltage of a tachogenerator mechanically coupled to the loading machine, V per rad/sThe machine detail parameters comprising the transfer functions A and Y are explained in the text.

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