Development of computer-aided design system of sensitive elements of control and automation systems

Abstract

The subject of research is the element base of devices of control and automation systems used in modern weight- and force-measuring devices, in particular, consisting of annular elastic sensitive elements. The developing of annular elastic sensitive elements is based on the analysis of existing methods for calculating elastic elements, new algorithms and modified methods for calculating. The proposed automated methods for analyzing the statics and dynamics of the element base under investigation are based both on analytical methods of the classical mechanics of elastically deformed bodies and on numerical methods for the purpose of exploiting their advantages and compensating for the weaknesses. For the development of automated design systems for annular elastic sensitive elements, mathematical modeling of deformation processes in a solid was carried out and an analysis of their characteristics was carried out using the modern ANSYS software complex on the basis of the finite element method. The mathematical model of the annular elastic sensitive element has a high degree of adequacy, low laboriousness with high productivity and low time costs. The software package is based on generating the most geometric model, as well as creating nodes and elements. When calculating the frequencies and forms of free oscillations, a modal analysis is used for linear systems. The solutions obtained were refined by means of harmonic analysis and analysis of transient processes. The article proposes a new approach to calculate and design the force-measuring membrane elastic element of the force sensor used in industrial scales with modern computer simulation methods. The reasons for the sensor error are described. The possibility of reducing the nonlinearity of the elastic characteristic and hysteresis due to the geometric nonlinearity and dry friction in the supports is considered. Rational geometric parameters of the elastic element were determined by the methods of finite element modeling, which make it possible to significantly reduce measurement errors. The research results are implemented in the practice of calculating and designing real structures. The results of the dynamic calculation were compared with the experimental data. For this purpose, were used the bar-and-pic chart of application of load of the elastic sensitive elements. The developed system of computer-aided design of sensitive elements of annular elastic elements will allow to ensure the production of modern and competitive domestic element base of automation devices.