Various techniques and devices are used to determine the shape errors of large-sized parts of technological units. This is important for the correct assignment of parameters for further reduction processing by special machines and machine tools. The acquired errors arise for several reasons: 1) large dimensions and weight of rotating parts, 2) the instability of the axis of the rotating part mounted on two support rollers, 3) the available initial and acquired shape error in the cross section of the part. It is important to define the types of form errors of the surfaces, error analysis, prediction and calculation of deviations from roundness in the cross section of the bandage, and the evaluation of cylindricity. Modeling of the process of operation and diagnostics of the unit, development of methods for determining errors, calculation of real values of deviations from the original contour on the basis of reconstruction of the contour of the section becomes important and necessary. These processes are performed using modern CAD systems and software. Obtaining data arrays in the process of measurements and their processing with the help of a special software module that performs an interactive calculation of shape errors with different geometric parameters of the cross-section of the bandage, provides the ability to obtain information about the state of the outer surfaces and parts of the supports on the operating unit. This article presents a method for determining the geometric parameters of the shape in the cross section of the rotation part, algorithms and software for reconstructing the contours of the cross sections of the part and calculating the shape error of the outer cylindrical surfaces

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One of the most actual and complex problems of medicine and neurology is the rehabilitation of patients. Robotic systems currently occupy an important place in the comprehensive rehabilitation of neurological patients with severe motor impairment of various etiologies, as well as the most socially significant and common neurological diseases. The article discusses various architectures of robotic systems for the rehabilitation of the lower limbs. The article also analyzes the work of foreign scientists who deal with these issues. As a result, a classification of rehabilitation systems has been compiled and reviewed. The structure of the rehabilitation system based on a passive orthosis and active parallel 3-PRRR robot is proposed. A numerical algorithm has been developed to determine the workspace of a 3-PRRR robot, taking into account design limitations. The algorithm is based on the concept of non-uniform coverings using interval analysis methods and is implemented in the C++ programming language. The results of computational experiments are presented. The simulation results are visualized by converting a set of three-dimensional parallelepipeds into an STL file. However, many areas remain open to theoretical research. A further area of research is the optimization of the geometric parameters of the system for carrying out rehabilitation procedures.