INFLUENCE OF ELECTRICAL ACTUATOR PARAMETERS ON THE PROCESSOF IDENTIFICATION OF THE CONTROL OBJECT DYNAMICS
The process variable control loops can use various equipment for technical implementation. Whentuning the controllers of these systems and their modeling, both linear and non-linear propertiesof objects should be taken into account. When using electric actuator in control systems to move thevalve, one should take into account the presence of significant non-linearities that can greatly affect theprocess, including identification. To assess the influence of non-linear properties of electric drives of actuators, simulation modelingfor various parameters of the object and non-linear properties of the drive was carried out. The speedof movement of the actuator was fixed, while the dynamics of the second order control object waschanged in such a way that it was either faster or slower than the actuator. In addition, the ratio betweenthe time response of the control object varied. Since the object has non-linear characteristics, theidentification was performed with several variants of the reference signal. The identification was carried out by minimizing the roof-mean-square deviation between theinitial acceleration curve of the nonlinear object and the transfer function of the second and third orders.An analysis of the approximation results showed that the nonlinear properties of the actuator havea significant impact on the process of identifying the dynamic properties until time response of theobject becomes much greater than the dynamics of the actuator. The rational order of the transferfunction of the approximation of the control object is also determined by the relationship between thedynamics of the actuator and the dynamics of the control object. To linearize the nonlinear properties ofthe actuator, it is worth introducing a delay link into the transfer function.