MEASURING THE DEGREE OF STRESS-STRAIN STATE STEEL ON THE BASIS OF SECOND ORDER FUZZY CONTROLLER

Abstract

During the operation of electrical and power equipment under the influence of excess pressure, mechanical, thermal loads and other factors, there is an accumulation of fatigue and other damage to buildings and metallic structural elements, leading to leakage of adverse processes leading to equipment failures with serious consequences that affect fire and industrial safety. In this paper considered the use of electromagnetic-acoustic method together with the method of dynamic identification of stress-strain state and the level of damage to metal equipment and the application of integrated criteria for a comprehensive assessment of current condition of the process equipment. The measurement applies second order fuzzy control. The paper discusses the features of synthesis of fuzzy controller based on experimental data: the formation of linguistic variables input and output signals, synthesis algorithm of production rules. The application of production rules with a double consequent possible to synthesize the fuzzy controller with the required accuracy. High accuracy, smooth nonlinear multidimensional characteristics, ease of synthesis allow using this controller not only in technological process control systems, but also in solving simulation problems and creating multidimensional nonlinear dependencies. The paper deals with the optimization of the process of calculating the results of the measurement by a serial connection of fuzzy controllers. Since the fuzzy controller is a static unit, the serial connection will also be non-linear static unit, which can be represented as a fuzzy controller. Application of the second order fuzzy controller takes into account the effects of temperature and thickness of metal of the control object. As a result, electromagnetic acoustic method allows not only to assess the class of stress-strain state, but also to calculate the exact value of the internal stress of the metal.