A STA Current-Constrained Control for PMSM Speed Regulation System with Function Disturbance Observer

The non-cascade permanent magnet synchronous motor control system has the advantages of simple structure and less adjustable parameters,but the non-cascade structure needs to solve the problem of over-current protection.In this paper,a current constrained control method is used to limit the starting current to a safe range.At the same time,to ensure the robustness and rapidity of the system,a super twist current constraint controller(CCSTA)is generated by combining super twist algorithm(STA)with current constraint control;Considering the diversity of internal and external disturbances,a functional disturbance observer(FDOB)is proposed to compensate the matched and unmatched disturbances,which further improves the robustness of the system.

Determination of a Numerical Analysis Algorithm for the Regulation of Blood Sugar in Diabetics

Acceptable glycemic control when examining the effects of meals was achieved when combining basal insulin therapy and high concentration insulin injection before a meal, when using a PID controller (Proportionality, Integrity and Derivative actions) alone, when using a PID controller with basal insulin therapy and when combining the three methods of insulin delivery. Naturally, a type 1 diabetic must inject himself with insulin in well-measured doses. Thus, the management and control of diabetes become a complex task when one must be considered the disturbance due to nutrition and sports activity. This concern has been at the center of much research through different approaches through mathematical methods and Artificial Intelligence methods. This article simulates a physiological model of glycemic control in type 1 diabetics by a PID regulatory mechanism, in the context of disturbances caused by the patient’s meals and athletic activity.

Dynamical models for secular evolution of navigation satellites

In this work,two dynamical models are formulated to describe the secular dynamics of navigation satellites moving in the medium Earth orbit(MEO)and geosynchronous orbit(GSO)regions.In the dynamical models,the leading terms of the Earth’s oblateness and the luni-solar gravitational perturbations are considered.For convenience,the orbits of the Sun and the Moon are described in the geocentric ecliptic reference frame,where the regression of nodal line and precession of apsidal line of the lunar orbit can be approximated as linear functions of time.The disturbing function acting on navigation satellites is analytically averaged over the mean motions of both the satellite and the third body(the Sun or the Moon).Explicit expressions of the averaged disturbing function are provided in the geocentric ecliptic and equatorial reference frames,corresponding to averaged model 1 and averaged model 2,respectively.It is found that there are seven resonant arguments in averaged model 1,while there are thirty-two resonant arguments in averaged model 2.The associated resonance curves corresponding to these resonant arguments in each model form the dynamical backbone in the phase space,organizing secular behavior of navigation satellites.At last,the averaged models are numerically compared to the associated non-averaged model,and simulation results indicate that(a)the averaged models formulated in the geocentric ecliptic and equatorial reference frames are identical,and(b)both of these two averaged models are applicable in predicting secular behavior of navigation satellites.