Vol 8, No 4 (2022): 15.12.2022

Full Issue

Articles

DESIGN OF A LOW-NOISE THROTTLE SECTION FOR SHUT-OFF CONTROL VALVES

Kryuchkov A.N., Ermilov M.A., Balyaba M.V., Ermilova Е.N., Vidyaskina A.N.

Abstract

The article describes the main source of hydrodynamic noise (HDN) in shut-off and control valves and the mechanism of the occurrence of acoustic energy. The main geometric parameters of the throttle section with a cylindrical shape are considered: the shape of the channels of the throttle section, the diameter of the orifices of the channels and the distance between the channels. The stages of choosing these geometric parameters are described. Changes in these parameters significantly affects the HDN in control valves. The article presents the experimentally obtained dependences of the change in the HDN level on the relative change in the diameter of the channels of the throttle section and on the change in the relative distance between the channels in 1/3 octave frequency bands.

Journal of Dynamics and Vibroacoustics. 2022;8(4):6-13
pages 6-13 views

VIBRATION CHARACTERISTICS OF LOW-PRESSURE COMPRESSOR BLADES OF GTE DN80

Prokofev A.B., Chernyavskiy A.Z., Vorokh D.A., Danilin S.A., Danilin A.I., Aksenov A.N., Maksimovskiy S.G.

Abstract

The contemporary power plants use gas-turbine engines (GTE) as the main part. The gas-turbine engines DU80 and DN80 performing a power of 25 MW manufactured by “Zorya-Mashproekt” are used as gas-compressor units at the facilities of PJSC “Gazprom”. The above mentioned GTEs possess a specific design drawback and poor characteristics of the 3rd and 4th stages low-pressure compressor (LPC) blade row, this leads to early engine malfunction and increased repair costs. The PRIZ-1 measuring unit developed by Samara University is briefly described. This unit was used to research the vibration characteristics of the GTE DN80 3rd and 4th LPC blade stages on the test bench of PJSC “Tyumenskie Motorostroiteli”. This article shows the results of the performed non-contact measurements of the deformation state parameters of the GTE DN80 3rd and 4th LPC blade stages: the static blades position; the blades bending oscillations amplitudes; the gaps between the blade tips and the inner surface of the housing; the torsional blades oscillations amplitudes; the changes in the blades twist angle. The examples of the measured parameters visualizations are presented. The results of the LPC blades vibration characteristics research will be used in the process of design and technological works aimed at tweaking, increasing the reliability of the blade row and the overhaul life of the DN80 gas turbine engine.

Journal of Dynamics and Vibroacoustics. 2022;8(4):14-24
pages 14-24 views

EXPERIMENTAL STUDY OF DISSIPATIVE PROPERTIES IN SQUEEZE FILM DAMPER BY USING THE IMPACT METHOD

Diligenskiy D.S., Novikov D.K., Lezhin D.S., Prokhorov S.A.

Abstract

This paper describes an experimental method to define the damping coefficient using a specially designed test device. The damping coefficient is defined through the transient analysis. Impact data is recorded using a sensitive acceleration sensor mounted on the device where a test object is placed – a squeeze film damper with an elastic ring, the design of which is often used in aircraft engine rotor supports.

Journal of Dynamics and Vibroacoustics. 2022;8(4):25-32
pages 25-32 views

ANALOG MODELING OF THE HYDRODYNAMIC CHARACTERISTICS OF A POSITIVE-DISPLACEMENT PUMP: SEPARATION OF THE SOURCE OF FLOW FLUCTUATIONS AND THE SYSTEM OF FLOW PART PASSIVE ELEMENTS

Rekadze P.D.

Abstract

The paper, using the example of an external gear pump, considers the solution of the problem of determining the node for separating the source of oscillations and the system of elements of the flow path is considered in order to simplify the study and analysis of hydrodynamic processes behind the source of oscillations. To separate the source of oscillations and the system of elements of the flow path, an experimental approach is used, during which the characteristic of pressure pulsations according to the “tooth” harmonic is determined behind the pump interacting with the serial RLC-circuit. An experimental study using dynamic analogies, methods of classical logic and methods of circuit theory made it possible to determine the connection node of the oscillations source and the system of elements of the flow path on the equivalent circuit, and in the graphic image of the flow part of the pump - to determine the corresponding section.

Journal of Dynamics and Vibroacoustics. 2022;8(4):33-40
pages 33-40 views

DEVELOPMENT OF STRUCTURAL ELEMENTS FOR THE CREATION OF LOW-NOISE CONTROL VALVES

Kozlov V.A., Kulichkova E.A., Petrov S.E.

Abstract

The article presents the development of structural elements and experimental work to ensure noise and vibration reduction in a series of axial type control valves. Studies of the flow part of the axial type control valves are carried out using optimized designs of control elements – low-noise devices. According to the research results, the best option was determined in terms of vibration levels and hydrodynamic noise.

Journal of Dynamics and Vibroacoustics. 2022;8(4):41-47
pages 41-47 views

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