Использование метода акустоупругости для контроля упругих механических напряжений в материале колец подшипников

2020 ◽  
pp. 28-37
Author(s):  
А.О. Рыжова ◽  
С.А. Бехер ◽  
А.А. Попков
Keyword(s):  
Mathematical Model ◽  
Wave Propagation ◽  
Mechanical Stresses ◽  
Steel Shkh15 ◽  
Interference Fit ◽  
Longitudinal Waves ◽  
Bearing Ring ◽  
Bearing Rings ◽  
Acoustoelasticity Method

Designed and manufactured samples of the interference fit of the bearing rings on the neck of wheelset axle. The hydraulic stand for loading bearing rings has been certified. The stand simulates the pressing fit of rings on the axis. A mathematical model of the method for monitoring mechanical stresses of the bearing ring by the acoustoelastic method for chordal sounding has been created and solved. The model takes into account the change in the angle between the direction of wave propagation and the axis of the main mechanical stresses. Experimentally by loading the bearing rings are determined by the coefficient of customproperty longitudinal waves in steel SHKH15. The bearing ring tension was measured using the acoustoelasticity method on the bearing tension samples.

Features of wave propagation in the sand of different saturation

2011 ◽  
Vol 8 (1) ◽  
pp. 25-38
Author(s):  
A.T. Akhmetov ◽  
S.V. Lukin ◽  
D.M. Balapanov ◽  
S.F. Urmancheev ◽  
N.M. Gumerov ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Porous Medium ◽  
Porous Media ◽  
Wave Propagation ◽  
Water Saturation ◽  
Weak Shock ◽  
Capillary Forces ◽  
Theoretical Studies ◽  
Longitudinal Waves ◽  
Experimental And Theoretical Studies

There are the results of experimental and theoretical studies on the propagation of weak shock waves in the wet sand at different water saturation. There are mathematical model and numerical analysis of propagation of pressure pulses in porous media, taking into account capillary forces. Non-monotonic dependence of the amplitude of the wave resulting in a wet porous medium vs. the degree of water saturation is installed. The evolution of the fast, slow and filtration waves depends on the saturation of the system with water is analyzed. The influence of capillary forces on the propagation of longitudinal waves is evaluated.

Relaxation of Residual Stresses in Bearing Rings Based on the Optimal Geometric Setup of Equipment for Centerless Running

2019 ◽  
Vol 973 ◽  
pp. 183-188
Author(s):  
Albert V. Korolev ◽  
Andrei F. Balayev ◽  
Boris M. Iznairov
Keyword(s):  
Mathematical Model ◽  
Residual Stress ◽  
Stress Relaxation ◽  
Residual Stresses ◽  
Elastic Strain ◽  
New Approach ◽  
Technological Method ◽  
Residual Stress Relaxation ◽  
Bearing Rings

This paper discusses the technological method of residual stress relaxation of bearing rings by centerless running with cylindrical rolls. Described a new approach to relieve residual stresses by centerless running of elastically-deforming rolls on the basis of the geometrical setup of the equipment. It was found that geometrical setup of the equipment influences an elastic strain of parts and the degree of residual stress relaxation. We obtained a mathematical model for calculation of setup parameters to ensure the required variation value of elastic strain of the part. The results of experiments confirm the influence of the geometric setup on the magnitude of residual stress relaxation.

Predictive removal of scattered noise

Geophysics ◽  
2006 ◽  
Vol 71 (2) ◽  
pp. V41-V49 ◽  
Author(s):  
Gérard C. Herman ◽  
Colin Perkins
Keyword(s):  
Mathematical Model ◽  
Wave Propagation ◽  
Surface Wave ◽  
Seismic Data ◽  
Coherent Noise ◽  
Data Set ◽  
Near Surface ◽  
Unique Data ◽  
Surface Wave Propagation ◽  
Petroleum Development

Land seismic data can be severely contaminated with coherent noise. We discuss a deterministic technique to predict and remove scattered coherent noise from land seismic data based on a mathematical model of near-surface wave propagation. We test the method on a unique data set recorded by Petroleum Development of Oman in the Qarn Alam area (with shots and receivers on the same grid), and we conclude that it effectively reduces scattered noise without smearing reflection energy.

Non-equilibrium Thermodynamics of Fast Traveling Waves in a Catalytic Fixed Bed. Emergence of Near-equilibrium Spatiotemporal Dissipative Structure

2018 ◽  
Vol 43 (3) ◽  
pp. 221-235
Author(s):  
Alexander P. Gerasev
Keyword(s):  
Mathematical Model ◽  
Wave Propagation ◽  
Traveling Wave ◽  
Dissipative Structure ◽  
Fixed Bed ◽  
Dissipative Structures ◽  
Catalytic Reactors ◽  
Linear Ordinary Differential Equations ◽  
Physical And Chemical ◽  
Non Equilibrium

AbstractThis work presents the results of the mathematical modeling of the fast traveling wave propagation phenomenon in the fixed-bed catalytic reactors according to a simple (basic) mathematical model with a reversible reaction. Qualitative and quantitative research is used to study the behavior of separatrices’ trajectories of the system’s non-linear ordinary differential equations. Special attention has been paid to the non-equilibrium thermodynamic methods. The entropy balance equation is constructed and analyzed under the assumption of the simple mathematical model of physical and chemical processes. The influence of key physical and chemical parameters on the fast traveling wave properties is studied. The phenomenon of fast traveling wave propagation in the fixed-bed catalytic reactors provides a vivid example of a spatiotemporal dissipative structure in active heterogeneous medium. These dissipative structures are shown to exist near the thermodynamic equilibrium.

Wave Propagation in Viscoelastic Laminates

1971 ◽  
Vol 38 (2) ◽  
pp. 448-454 ◽  
Author(s):  
M. Stern ◽  
A. Bedford ◽  
C. H. Yew
Keyword(s):  
Wave Propagation ◽  
Effective Modulus ◽  
Simplified Model ◽  
Structure Parameter ◽  
Longitudinal Waves ◽  
Material Parameters ◽  
Dispersion And Attenuation ◽  
Attenuation Characteristics ◽  
Representative Material ◽  
Effect Of Structure

For a simplified model of a laminated medium consisting of alternating layers of elastic and viscoelastic materials, the dispersion and attenuation characteristics for “plane,” longitudinal waves propagating in the direction of the layering are obtained. The dispersion and attenuation curves depend on a structure parameter involving the thickness of the layers and can deviate significantly from corresponding results for a continuum “effective-modulus” model. Curves are presented for a specific case with representative material parameters showing the effect of structure and of variations in the parameters of the composite.

Контроль натяга колец подшипников поверхностными волнами с использованием эффекта акустоупругости

2021 ◽  
pp. 13-21
Author(s):  
С.А. Бехер ◽  
Л.Н. Степанова ◽  
А.О. Рыжова ◽  
А.Л. Бобров
Keyword(s):  
Elastic Waves ◽  
Stress Measurement ◽  
Correlation Method ◽  
Computational Studies ◽  
Error Minimization ◽  
Wave Pulse ◽  
Bearing Ring ◽  
Press Fit ◽  
Freight Car ◽  
Bearing Rings

In this paper, experimental and computational studies of the method of controlling the tension of bearing rings using the acoustoelasticity effect, based on measuring the characteristics of surface elastic waves propagating in a stressed medium, are carried out. Tuning samples of bearing rings tension on the axle neck of a freight car wheelset with an error of no more than 7 microns were developed and manufactured. Certification of a hydraulic stand for loading bearing rings, simulating their press fit on the axle, was performed. For surface waves, the acoustoelastic coefficient was measured by a Rayleigh wave pulse that repeatedly circled the ring. The correlation method for determining the delay time of a wave in a loaded ring relative to the unloaded one is optimized according to the condition of error minimization. The main reasons for the appearance of errors and uncertainties in the absolute time of propagation of a surface wave through the ring are considered: the influence of waves reflected from the boundaries, the curvature of the surface, and attenuation. The bearing ring tension was measured using the acoustoelasticity effect and the uncertainty of the stress measurement was estimated.

Detection of the Corrosion of Axisymmetric Elements by Means of the Eddy Current Testing Method

2015 ◽  
Vol 227 ◽  
pp. 545-548 ◽  
Author(s):  
Andrzej Zbrowski ◽  
Wojciech Jóźwik
Keyword(s):  
Eddy Current ◽  
Current Method ◽  
Eddy Current Method ◽  
Current Testing ◽  
Bearing Ring ◽  
Testing Method ◽  
Signal Value ◽  
Corrosion Defects ◽  
Bearing Rings ◽  
Peak Value

The article describes the influence the operating frequency of the transducer on the possibility to detect corrosion using the eddy current method. A bearing ring with two artificially made corrosion defects was used as a test object. The authors determined the characteristics of the defect’s signal value in the function of frequency. The results obtained were then compared to the peak-to-peak value of the signal for a model ring. The tests confirmed the possibility of automatic detection of corrosion on the surface of bearing rings using the eddy current method.

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