Search

Search Results

• TO ESTIMATION OF ATTRACTION AREA OF EQUILIBRIUM IN NONLINEAR CONTROL SYSTEMS

  Almashaal Mohammad Jalal

  6-14

  2025-07-31

  Abstract ▼

  Designing nonlinear control systems is still difficult, so many researchers are trying to find
  some useful ways and methods to solve this problem. As a result of such research, some methods
  have been seen trying to design a good enough control system for nonlinear plants. But a disadvantage
  of these methods is the complexity, so it created a need to compare some methods to determine
  which one is the easiest method to design a control system for nonlinear plants. It was
  found a way to compare two methods, which is comparing the regions of initial conditions of the systems which are designed using these methods. Two analytical nonlinear control systems design
  methods are compared on the example of the design control systems mobile robots. The algebraic
  polynomial-matrix method uses a quasilinear model, and the feedback linearization method uses
  particular feedback. Both considered methods give a bounded domain of equilibrium attraction,
  therefore the obtained control systems can be operated only with bounded initial conditions. The
  numerical example of designing the control systems for one object by these methods and the estimates
  of the attraction areas of the system’s equilibriums in these systems are given in the paper.
  As a result of this paper, it was found that using the algebraic polynomial-matrix method will get a
  bigger section of initial conditions of the plant’s variable than the same section which is given by
  the feedback linearization method.

• DETERMINATION OF TARGET COORDINATE ERRORS IN MULTI-POSITION RADAR USING GROUPS OF UNMANNED AIRCRAFT

  I.V. Borisov , А.S. Kuzmenko , V. Е. Kuryan , Е. М. Levchenko , М.V. Kuryan

  273-284

  2025-07-24

  Abstract ▼

  The article proposes and develops an algebraic method for determining the coordinates of targets and their errors as part of a group of unmanned aerial vehicles. The main assumptions of the developed model of the functioning of a group of unmanned aerial vehicles: The speeds of aircraft do not exceed the speed of sound in the air, and the speeds of targets do not exceed the first space were justified. The main assumptions of the model of operation of a group of unmanned aerial vehicles: the UAV speeds do not exceed the speed of sound in the air, and the target speeds do not exceed the first space one, are justified in the article. Qualitative estimates of the radar signal reception time for a given spatial error of the target coordinates were presented. The conditions for the number of aircraft in the group are formulated, which increase the accuracy of determining the location of the target in space. The various types of errors that arise when organizing the search for targets by a group of aircraft are analyzed. The issues of dependence of the resulting error in calculating the coordinates of the search target on the error in measuring the distance between the aircraft in the group and the target itself, depending on their mutual spatial orientation, are investigated. An algorithm has been developed, calculations and analysis of the results for this task have been carried out. The simulation is based on the proposed algorithm, taking into account random coordinates of the target in a fixed sector and taking into account random errors in the measured distance between a group of aircraft and the search object. The results of modeling the influence of the configuration of a group of unmanned aerial vehicles and the location of the target on the error in determining its coordinates are presented. An assessment was carried out to determine the coordinates of the goals and an error estimate of the proposed algebraic approach. The ways of further research are determined. The issues of estimating the amount of calculation for a large number of goals are considered.
  The scope and effectiveness of the proposed algorithm and method for solving the problem as a whole are determined.