Vol 7, No 1 (2021)

Full Issue

Articles

WAVE GENERATOR BASED ON A HYDRAULIC SYSTEM

Komarov T.D., Sverbilov V.Y.

Abstract

Renewable energy is the production of energy from resources that are inexhaustible on a human scale. The main principle is the use of energy from processes occurring in the environment.

Alternative energy is a set of promising methods for obtaining, transferring and using energy, which are less common than traditional ones, but are of interest due to the low risk of causing harm to the environment.

Currently, the generation of electricity through the use of wave energy is not common and is experimental. Nevertheless, it is one of the most promising renewable energy sources, and also has the potential to become one of the main components of the world's energy production.

In this work, a wave generator based on a hydraulic system has been designed. Various versions of this installation are considered, and the existing designs of such devices are analyzed. Based on this, the most efficient design was selected.

The following stages have been completed: the design of the wave generator, the design of the hydraulic system, the calculation of the system elements according the technical requirements, the selection of standard components and units, the calculation of efficiency and mathematical modeling of the system operation.

Journal of Dynamics and Vibroacoustics. 2021;7(1):15-20
pages 15-20 views

SIMULATION OF ACOUSTIC WAVE PROPAGATION IN HYDRAULIC CONTROL SYSTEMS WITH OBTAINING SPECTRAL CHARACTERISTICS OF SOUND POWER DISTRIBUTION IN THE SOFTWARE PACKAGE SIMHYDRAULICS MATLAB

Berestovitsky E.G., Solovyev M.

Abstract

Modern hydraulic systems are subject to stringent noise and vibration requirements. In the existing scope of work a lot of attention is paid to a variety of factors, often without taking into account their mutual influence. In General, they can be divided into schematic design, system and principle. Currently, the development of science and technology is at a level where further improvement of the acoustic quality of individual elements and systems as a whole is possible in the study of emerging processes at the intersection of Sciences. In this regard, the paper considers the possibility of modeling wave processes in hydraulic control systems with the subsequent obtaining of acoustic characteristics, which is a joint use of the mathematical apparatus of the control theory and methods of acoustics. The simhydraulics Matlab software package is considered as one of the most suitable means of solving the tasks. Along with mathematical models of control system elements, the paper proposes acoustic models of elements that are taken into account when modeling transients in the system. Based on the results obtained, additional criteria for assessing the quality of management systems are proposed.

Journal of Dynamics and Vibroacoustics. 2021;7(1):21-27
pages 21-27 views

ON USING BENCH MEASURING PIPELINES AS ACOUSTIC LOADS OF PRESSURE PULSATION PROBES

Bystrof N., gimadiev A.

Abstract

When adjusting the gas turbine engine for operating parameters, taking into account pressure pulsations in the gas generator path, acoustic probes are used with the sensor moving out of the high temperature zone. The input waveguide included in the probe is an acoustically resonating element that significantly distorts the measurement result. Among the various corrective elements for acoustic probes, in practice, a special role is given to non-reflective loads in the form of long lines. During bench tests, it is often advisable for manufacturers to use structures made up of durite hoses with short sections of metal pipelines in addition to long lines. The attached material shows the test results of a model probe with several types of such agreed loads. The possibility of such a solution to increase the accuracy of measuring pressure pulsations in conditions of increased temperatures is shown.

Journal of Dynamics and Vibroacoustics. 2021;7(1):28-33
pages 28-33 views

DETECTION OF LOCAL IRREGULARITIES IN THE ROAD PAVEMENT ON THE BASIS OF WAVELET TRANSFORM OF ULTRASONIC PROFILING DATA

Stolbova A.A., Prokhorov S.A., Golovnin O.K.

Abstract

The paper presents an approach to the detection of road pavement defects on the streets and highways based on wavelet analysis of data obtained from an ultrasonic profilometer. The approach makes it possible to determine the location of pavement defects in relation to the road lane. The results of implementing the approach using the complex Morlet wavelet and the first derivative of the Gaussian function are presented. Implementation of the approach reduces the influence of interference arising during ultrasonic diagnosis.

Journal of Dynamics and Vibroacoustics. 2021;7(1):34-38
pages 34-38 views

ANALYSIS OF THE VIBRATION STATE OF ROLLING BEARINGS WITH THE DEFECT "WEAR OF THE INNER BEARING CAGE"

Balyaba M., Kryuchkov A., Ermilov M., Plotnikov S.M., Ermilova E.N., Vidyaskina A.N.

Abstract

In this paper, the issues that need to be taken into account when analyzing the vibration state of rolling bearings with the defect "wear of the inner bearing cage" are touched upon. A design diagram of rolling bearings and a diagram of the forces acting on the bearings during their operation in a screw compressor are presented. Studies of the vibration state of rolling bearings on an operating screw compressor at a real industrial facility have been carried out. Vibration measurements were carried out when the compressor was operating with new bearings and with workers on whom there was obvious wear of the inner cage. The effect of wear of the inner bearing cage on the vibration state of the screw compressor is shown. It is established that for this type of bearing defect, in relation to the object un-der study, when analyzing the vibration state, the use of direct autospectral parameters is ineffective. For the case under consideration, the most effec-tive are the parameters of amplitude and frequency modulation.

Journal of Dynamics and Vibroacoustics. 2021;7(1):6-14
pages 6-14 views

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