N. Lukovich

Bio: N. Lukovich is an academic researcher from South Ural State University. The author has contributed to research in topics: Bearing (mechanical) & Rotor (electric). The author has an hindex of 1, co-authored 1 publications receiving 2 citations.

Evaluation of Thermal Condition of Turbocharger Rotor Bearing

Abstract: The thermal state of the sliding bearings has a great influence in calculating the dynamics of the flexible rotor of the turbo-compressor. Experimental studies have shown that the temperature difference between the turbine and compressor bearings can reach twenty degrees. In addition, the temperature is unevenly distributed across the lubricating layer. It increases in the area of elevated pressure. The task of assessing the thermal state of the rotor plain bearings is relevant. The effect of eccentricity on the pressure distribution in a thin lubricating layer of a non-Newtonian fluid was considered. The distribution of temperatures and pressures in the lubricant layer was constructed taking into account the rheological properties of the lubricant. The boundary conditions that were used to solve the problem were taken from the experiment. The results will be used to solve the problem of the dynamics of the turbocharger rotor.

Metaheuristic Algorithm-Based Vibration Response Model for a Gas Microturbine

Abstract: Data acquisition and processing are areas of research in fault diagnosis in rotating machinery, where the rotor is a fundamental component that benefits from dynamic analysis. Several intelligent algorithms have been used to optimize investigations of this nature. However, the Jaya algorithm has only been applied in a few instances. In this study, measurements of the amplitude of vibration in the radial direction in a gas microturbine were analyzed using different rotational frequency and temperature levels. A response surface model was generated using a polynomial tuned by the Jaya metaheuristic algorithm applied to the averages of the measurements, and another on the whole sample, to determine the optimal operating conditions and the effects that temperature produces on vibrations. Several tests with different orders of the polynomial were carried out. The fifth-order polynomial performed better in terms of MSE. The response surfaces were presented fitting the measured points. The roots of the MSE, as a percentage, for the 8-point and 80-point fittings were 3.12% and 10.69%, respectively. The best operating conditions were found at low and high rotational frequencies and at a temperature of 300 ∘C. High temperature conditions produced more variability in the measurements and caused the minimum value of the vibration amplitude to change in terms of rotational frequency. Where it is feasible to undertake experiments with minimal variations, the model that uses only the averages can be used. Future work will examine the use of different error functions which cannot be conveniently implemented in a common second-order model. The proposed method does not require in-depth mathematical analysis or high computational capabilities.

Dynamic balance compensation method of radial asymmetric rotor

Abstract: The invention relates to a dynamic balance compensation method for a rotor with an asymmetric radial structure. By integrating a left balance tool and a left balance frame as an integral component, the additional unbalance amount of a system is eliminated. A right balance tool and a right balance frame are integrated as an integral component, through the overturn compensation operation and staticbalance operation of the two integral components, the additional unbalance amounts of the right balance tool and a right balance frame system are eliminated, and thus the problem that the unbalance amount of each angular position of a rotor can not be corrected to a predetermined value for the rotor with asymmetrical radial structures at two ends is overcome. Through a method of eliminating the additional unbalance amount of the entire balance system by step operations, the problem of large fluctuation of the unbalance amount in the dynamic balance measurement of a rotor overturn angle can beeffectively overcome, and thus the dynamic balance work of the type of rotor can be completed with high quality.