# Improving Energy Efficiency of Grain Cleaning Technology
###### Abstract  
The relevance of the research topic was substantiated, and the purpose and objectives of the study were formulated. It was determined that the energy efficiency of the grain cleaning process can be evaluated only when all the machines operate in a single production line and are coordinated in productivity. Research on energy savings and energy efficiency in the technological process of post-harvest grain treatment using grain cleaning units by implementing the method of mathematical experiment planning (MEP) was conducted. The method is based on transforming the initial mathematical models of various research objects into a model in the form of regression equations convenient for solving the problems of research, analysis and optimization of the object. For the first time, the mathematical description of the target function was performed by conducting a multifactorial experiment based on second-order design. The research produced adequate second-order regression equations, making it possible to determine the minimum specific consumption of electricity for the technological process of post-harvest grain treatment at grain cleaning facilities, while complying with the agrotechnical requirements for the quality of the cleaned grain. The problem of optimization of the research object was solved by mathematical transformations, which enabled obtaining graphical and analytical interpretations of the optimum area. For this purpose, the canonical transformation of the mathematical model and the method of two-dimensional cross-sections of the response surface were used. Research has led to the development of scientifically based standards of specific electricity consumption for grain cleaning processing schemes, which serve as criteria for evaluating energy savings in the technological processes. cleaning units of agricultural enterprises can be attained by providing the rated load on the drive electric motors of the production lines, which ensures grain cleaning with minimal power consumption and is a criterion in evaluating its use [4,5]. The aim of the study is to determine the operating modes to optimize the electrical equipment of a ZAV-40 grain cleaning unit. The task of the research is to determine the operating modes of post-harvest grain production lines providing minimum electricity consumption within the input parameter change range. Among the technical means of complex mechanization of post-harvest grain treatment, ZAV-40 grain cleaning units are rather widespread. In response to the transition to new methods of economic management, prerequisites for transforming energy saving from an abstract factor of economy into a real necessity began to form. For the last 10-15 years, post-harvest technology on farms based on stationary grain cleaning units ZAV-10-ZAV-50, and KZS-10-KZS-50 account for up to 60-70% of grain and seeds processed on farms. In order to upgrade existing equipment, IMEA UAAS in cooperation with JSC \"Vibroseparator\" created domestic complexes for processing food and feed grains with a capacity of 25 and 50 t/h. However, regardless of the introduction of new units and complexes, for many years, the bulk of grain was cleaned on the equipment available on farms, so a number of additional measures need to be taken to ensure that the equipment is functional at a minimum specific electricity consumption. To ensure the high-quality post-harvest treatment of grain, researchers [6] have suggested using a linear induction motor for driving vibration centrifugal separators, which directs the movement of the working body without any transducers. The authors of [7,8] obtained a mathematical model of a grain separator and conducted experimental studies confirming the adequacy of the model. The simulation error did not exceed 9%. The authors of [9,10] carried out research and suggested using a linear induction drive instead of the classical mechanic drive of the grain cleaning unit and the grain separator.