Vol 9, No 4 (2023)

Cover Page

Full Issue

Articles

IN MEMORY OF ACADEMICIAN VLADIMIR PAVLOVICH SHORIN

Bystrov N.D.

Abstract

In December 2023, at the age of 85, Academician Vladimir Pavlovich Shorin, an outstanding scientific and public figure who played a key role in the creation of the Russian Academy of Sciences in the 90s and restoring the importance of education in the country, passed away. The words of Academician A.N. Krylov apply to the scientific activity of V.P. Shorin like nothing else: “We must remember that the costs of truly scientific creativity are then repaid in the life of the state not by a sevenfold, not a hundredfold, but by numbers for which there were no names in the ancient language.” Vladimir Shorin’s entire life was devoted to serving science, creating a new scientific school and new scientific directions. Having defended his doctoral dissertation and become a professor, he created a new educational department at the Kuibyshev Aviation Institute in the early 80s, which for a long time trained specialists in the field of automatic control of aircraft engines and laser technologies. After recent educational reforms, his department, already at Samara University, continues to train bachelors and masters in the field of production automation and robotics, which are in demand at enterprises in the region and throughout the country. Under his scientific leadership, several dozen of his followers defended their candidate and doctoral dissertations and earned academic titles. The scientific heritage of Vladimir Shorin includes dozens of books, several hundred scientific articles and dozens of patents. The Motherland highly appreciated the role of Vladimir Shorin in the creation of a scientific school, the leadership of science, his activities as a deputy in the country's legislative body, and the training of engineering and scientific personnel. Possessing high human qualities, Vladimir Shorin was the center of attraction for his employees and friends. He valued family ties very highly. He honored the memory of his parents and deceased brothers. The scientific community of the country, paying tribute to the memory of V.P. Shorin, continues to comprehend and develop his ideas. Life has shown that the scientific and engineering works of Academician Vladimir Pavlovich Shorin have received extremely wide application in practice and have given rise to the creation and development of new scientific directions.

Journal of Dynamics and Vibroacoustics. 2023;9(4):6-18
pages 6-18 views

FORECASTING THE ESTIMATED LIFE OF GTE PARTS BASED ON THE IMPACT OF ANALYTICAL AND OPERATIONAL FACTORS

Pakhomenkov A.V., Bukatyy S.A.

Abstract

This paper considers a life analysis method applying to GTE parts and based on low-cycle fatigue endurance of parts with due account of analytical and operational factors. Using life analysis for a disk of the first stage of a low-pressure compressor as an example, it is shown that the current strength factors underestimate calculated cyclic lives over 4 times.

Journal of Dynamics and Vibroacoustics. 2023;9(4):19-30
pages 19-30 views

GAS DYNAMIC FACE SAEL TIGTNESS UNDER NON-STATIONARY LOADING

Vinogradov A.S., Sharonov A.I., Zagadov I.A., Komisar Y.V.

Abstract

This paper presents a new method for calculating leaks of an end gas dynamic seal with spiral grooves in various modes of operation of an aircraft engine. This type of seal has never been used in the design of aircraft engines, however, it has good characteristics in comparison with traditional types of seals. In the developed methodology, the effect of changing the engine operating mode on temperature loads and deformations is investigated. The simulation results are compared with experimental data.

Journal of Dynamics and Vibroacoustics. 2023;9(4):31-42
pages 31-42 views

ON THE ERRORS IN MEASUREMENT OF RESIDUAL STRESSES AND PREDICTION OF THE ENDURANCE LIMIT OF HARDENED PARTS

Sazanov V.P., Pavlov V.F., Matveeva K.F., Konyhova A.S.

Abstract

The study is devoted to the analysis of discrepancy between the results of prediction and of multi fatigue tests of cylindrical parts with stress concentrator in the form of a semicircular notch, made of construction steels 20, 45, 30ХГСА and 40Х. The surface of the parts was hardened by hydro and pneumatic shot blasting methods. When predicting by the reference specimen method, bushes with a length of 80 mm, with an outer diameter of 51.5 mm and an inner diameter of 45 mm were used to determine residual stresses in the hardened layer. Modeling of the residual strain-stress state in bushes and notched parts was carried out using the Finite Element method in the environment of PATRAN/NASTRAN and ANSYS calculation systems using the thermo elastic method. When predicting the increment in the endurance limit due to hardening for parts with notches, the criterion of average integral residual stresses was adopted, determined at the critical depth of a non-propagating fatigue crack. The discrepancy between the calculated prediction and bending test results in the case of a symmetrical cycle was no more than 11% for pneumatic shot blasting and no more than 8% for hydro shot blasting. The positive results of the study showed that the accepted assumptions in the reference specimen method are completely justified.

Journal of Dynamics and Vibroacoustics. 2023;9(4):43-51
pages 43-51 views

STUDY OF THE NORMAL SPEED OF FLAME PROPAGATION OF A METHANE-AIR MIXTURE ENRICHED WITH HYDROGEN AND DILUTED WITH WATER VAPOR

Idrisov D.V., Matveev S.S., Matveev S.G., Gurakov N.I., Popov A.D., Litarova A.A.

Abstract

The results of an experimental study of the normal flame propagation speed of a hydrogen-enriched and/or water vapor-diluted methane-air mixture at atmospheric pressure and initial mixture temperatures of 300 and 330 K are presented in this paper. The normal flame propagation speed was determined by the zero heat flow method (Heat Flux). The obtained experimental data were compared with the results of numerical simulation of adiabatic premixed laminar flames, which was carried out using three kinetic mechanisms of the methane-hydrogen fuels oxidation. The flame speed increased proportionally up to 35% when the methane was enriched with hydrogen up to 35% by volume. With increasing vapor concentration, a linear decrease in the flame speed of the methane-air mixture was observed. This decrease does not depend on the degree of hydrogen enrichment. Recommendations are proposed for the use of kinetic mechanisms to simulate the flame of a methane-air mixture when it is enriched with hydrogen and diluted with water vapor.

Journal of Dynamics and Vibroacoustics. 2023;9(4):53-63
pages 53-63 views

ABOUT THE APPLICATION OF MR MATERIAL FOR NOISE REDUCTION OF MECHANICAL ENGINEERING PRODUCTS

Igolkin A.A., Safin A.I.

Abstract

The noise of mechanical engineering products is strictly regulated by national standards. Noise requirements tend to become more stringent. The article describes the experience of using MR material to reduce the noise level of various products.

Journal of Dynamics and Vibroacoustics. 2023;9(4):64-70
pages 64-70 views

RESEARCH OF THE FLOW CHARACTERISTICS OF A HYDRAULIC DRIVE BASED ON A HYDROSTATIC SUPPORT WITH MAGNETORHEOLOGICAL CONTROL

Shelkovyy M.A., Bazinenkov A.M.

Abstract

A hydraulic drive with magnetorheological control is an effective solution when it is necessary to ensure precise positioning of a massive object. The magnetorheological drive is capable of positioning an object weighing up to 100 kg with an error of up to 50 nm. The dynamic characteristics of the working fluid flow in various sections of the pipeline determine the technical characteristics of the device as a whole.

In this paper, the hydraulic characteristics of the drive are studied by the finite element method under laminar flow conditions. A study of the pressure at the inlet and outlet of the magnetorheological throttle showed that the pressure drop ranges from 8.2 kPa to 26.2 kPa, depending on the pressure at the inlet of the hydraulic system and the location of the throttle. The fluid flow velocity in the technological gap was 1 m/s in the center of the channel and allows us to evaluate the behavior of the drive at various operating pressures, as well as subsequently carry out a complete modeling of the system to implement the mechanism control system.

Journal of Dynamics and Vibroacoustics. 2023;9(4):71-79
pages 71-79 views

This website uses cookies

You consent to our cookies if you continue to use our website.

About Cookies