- Vibration Control, Condition Monitoring maintenance vibration analysis, Rolling Mill, Chatter Vibration, Failure Diagnosis, Torsional Vibration Analysis of Geared Systems, and 23 moreNanotechnology, Cellular Automata, Severe Plastic Deformation, Microstructure modelling, Multiscale modelling, Vibrational dynamics, Gears, Condition monitoring and fault diagnosis of electric machinery, Nondestructive testing, Statistical Mechanics, Prognosis and health management, Mechanical Vibration and Machinery System Dynamics, Signal Analysis and Pattern Identification, Cold Rolling and Galvanising of Steel, Nonlinear vibrations, Electrical Engineering, Mechanical Engineering, Thermal Engineering, Cryogenics Treatment for Material, Cryogenic Machining, Industrial and Mechanical Engineering, Metallurgical and Materials Engineering, Rolling element bearings, and Metallurgical Engineeringedit
Wheeled vibration-driven platforms have taken a prominent place among mobile robotic systems. Numerous investigations are dedicated to developing novel designs and analyzing mobile vibratory robot's dynamic behavior and performance. The... more
Wheeled vibration-driven platforms have taken a prominent place among mobile robotic systems. Numerous investigations are dedicated to developing novel designs and analyzing mobile vibratory robot's dynamic behavior and performance. The present paper is dedicated to the locomotion conditions of a wheeled platform equipped with the V-shaped spring-damper suspension and driven by the centrifugal vibration exciter (unbalanced rotor). This research methodology contains mathematical and numerical modeling, computer simulation, and full-scale experimental investigations on the dynamic behavior of the semi-definite single-mass vibration-driven system at the specified design parameters and excitation conditions. The obtained results present the time dependencies of the system's motion trajectory, horizontal and vertical velocities, and accelerations. The main scientific novelty of the performed investigations is the development of the generalized mathematical model that describes the locomotion conditions of the wheeled vibration-driven system for the specified design parameters of a V-shaped spring-damper suspension. The results of this research can be practically implemented while defining the optimal geometrical, inertial, damping, and excitation parameters of suspensions of various mobile vibration-driven locomotion systems, particularly those intended for cleaning and inspecting the internal surfaces of pipelines, tubes, and vessels.
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ABSTRACT The excessive dynamic loads and shock vibration are particular for the hot rolling mills equipment. An attempt to reduce torque amplification factor (TAF) has been done for the roughing stands of a wide strip hot rolling mill.... more
ABSTRACT The excessive dynamic loads and shock vibration are particular for the hot rolling mills equipment. An attempt to reduce torque amplification factor (TAF) has been done for the roughing stands of a wide strip hot rolling mill. Drive acceleration method was used in order to close the open backlashes gaps before transient process begins. This method is usually implemented for the reversing stands without gearboxes. But for the drive trains which include heavy gearboxes with the big rotating inertias it could be applied effectively partly. The second mode of torsional vibration may significantly change TAF in the different couplings. Therefore torque active control by motor speed regulation should be rearranged. Industry measurements of the torques and vibrations have been carried out to prove drive acceleration method to torsional vibration active control in dependence on drive trains design.
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Condition monitoring and diagnostics of minerals mining machines is a challenging task for operating companies and their maintenance staff. Conventional approaches based on measurements of vibration, temperature and other parameters are... more
Condition monitoring and diagnostics of minerals mining machines is a challenging task for operating companies and their maintenance staff. Conventional approaches based on measurements of vibration, temperature and other parameters are still not widely implemented in the mining industry due to non-stationary loading conditions. Registration of overloading and resonance modes is not sufficient by the electrical motors current in case of heavy mobile vehicles or stationary mounted mining machines having multi-body structure. Telemetric torque measurement tools installed in the drivetrains of mining machines allow accounting the variation of loads and gives valuable information on damages in geared transmissions. This paper represents the different methods of torque measurement and digital telemetry device under development based on strain gauges. The focus is on the functionality required for industrial applicability and issues in course of machines operation and maintenance. The additional features, which the torque meters afford for mining machines diagnostics, are considered.
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Research Interests: Engineering, Vibration, Nonlinear vibrations, Torsional Vibration Analysis of Geared Systems, Prognosis and health management, and 9 moreNondestructive testing, Condition monitoring and fault diagnosis of electric machinery, Train, Dynamic Response, Nonlinear system, Torque, Signal Analysis and Pattern Identification, Mechanical Vibration and Machinery System Dynamics, and torsional vibration
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The ability of a knowledge-oriented system to learn requires the selection and organization of data. The article is devoted to the disclosure of the stages of data preparation for the application of case-based procedures to support... more
The ability of a knowledge-oriented system to learn requires the selection and organization of data. The article is devoted to the disclosure of the stages of data preparation for the application of case-based procedures to support decision-making by the operator of the technological process in the field of oil and gas wells drilling. The presented concept allows concentrating expert experience in the subject area and satisfies the criteria of the main sources of knowledge required for the functioning of case-based considerations. The main potential of artificial intelligence to learn is based on semantic dictionaries of the subject area, case databases in the form of knowledge bases, metrics of similarity, adaptation and configuration containers, which are identified as the sources of knowledge. The effectiveness of using computer simulators as a platform for experimental research of new models of complex technological processes is estimated.
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Resonant and out-of-resonance vibration machines are investigated operating under conditions of non-stationary loads and the influence of variable parameters of treated bulk material. The design scheme, which is based on a beam system... more
Resonant and out-of-resonance vibration machines are investigated operating under conditions of non-stationary loads and the influence of variable parameters of treated bulk material. The design scheme, which is based on a beam system with intermediate elastic supports and concentrated in the middle of the span mass, which performs transverse oscillations, is considered. This scheme allows changing the natural frequency of oscillations of the single-mass system due to the shift of the intermediate supports along the beam. Nonlinear dependences of the natural frequency of mass oscillations in the case of elastic intermediate supports are determined and analysed. The optimization of the vibration system is proposed to minimize the mass and provide the given frequency characteristics. A scheme of the frequency characteristics adjusting in the process of the vibrating machine operation has been introduced. The control scheme is based on feedback by the mass vibration signal.
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Monitoring and diagnostics of elements of the belt conveyor is a challenging task. One of the hardest aspects is dealing with objects such as rolling idlers that support the belt. They are distributed along the entire length of a... more
Monitoring and diagnostics of elements of the belt conveyor is a challenging task. One of the hardest aspects is dealing with objects such as rolling idlers that support the belt. They are distributed along the entire length of a conveyor, and their amount can easily reach thousands. In the ideal case, every idler should undergo in-situ monitoring, however, this is impractical. Hence, it is proposed to use remote sensing to acquire knowledge about some aspects of their condition. In particular, the authors propose to measure the rotational speed of the idler based on short video recordings. This data could be captured by mobile inspection robots, such as UAVs or UGVs, or even manually. Detecting the fact that the idler rotates with improper speed (lower than nominal), could indicate a developing fault of the internal bearing. An idler that rotates slower than it should also create additional friction between itself and the belt. This friction can increase the overall operational resistances, and even cause fire due to increased temperature. In this paper, the authors present a simple method for establishing the rotational speed of the idler based on video data analysis.
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The purpose of the presented study is to investigate the influence of the distance between three infinite circular cylinders in a tandem group on their aerodynamic coefficients and the general flow pattern. The questions of the numerical... more
The purpose of the presented study is to investigate the influence of the distance between three infinite circular cylinders in a tandem group on their aerodynamic coefficients and the general flow pattern. The questions of the numerical simulation of viscous incompressible flow around a group of cylinders in the tandem arrangement are considered. The numerical study of the flow around the group of cylinders is based on unsteady Reynolds-averaged Navier-Stokes equations. The results are presented as a visualization of the instantaneous flow parameters and the dependencies of the averaged drag coefficients on the distance between the cylinders. Following the previous investigations, the flow parameters were chosen in a little-studied range, corresponding to the Reynolds number of 120 for a standalone cylinder. The distances between the centers of neighboring cylinders ranged from 1.1 to 6.0 cylinder diameters. Three characteristic flow patterns are distinguished depending on the distance between the cylinders. The first one is a steady-state flow similar to the flow around the standalone cylinder. This flow pattern is formed when the distance between the cylinders is less than three diameters. Increasing the distance between the centers up to four diameters produces the second flow pattern. The vortex street is formed behind the group while the flow between the cylinders remains steady. Further increasing the distance between the cylinders causes the formation of the third pattern when the flow between the cylinders becomes unsteady as well. The averaged drag coefficients for each cylinder in the group are obtained. The presented work helps better to understand the flow structure around the group of cylinders and can be used at the design stage in various engineering applications, including cooling towers, heat exchanger tubes, chimney stacks, marine platforms, and high-rise buildings.
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The belt conveyors of high power are the main transport in the industry, especially for mining enterprises. Since the total length of conveyors in the mines reaches several kilometres, the inspection of all idlers in harsh conditions is a... more
The belt conveyors of high power are the main transport in the industry, especially for mining enterprises. Since the total length of conveyors in the mines reaches several kilometres, the inspection of all idlers in harsh conditions is a challenge for maintenance personnel because the jamming of supporting idlers with damaged bearings causes belt overheating and subsequent fire. Conveyor belt breaking is also a serious trouble during continuous operation. In this research, the authors based on preliminary measurements are aiming to show that fault detection in belt conveyor idlers is quite possible to be conducted using a single or multiple small-size IMU (or other type thin sensors) placed directly on the belt or inside it. The information available from the IMU sensor is discussed in this paper. Transient signals are associated with the sensor passing each idler. Some methods for signals processing and possible diagnostic features extraction are presented.
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An approach based on an artificial neural network (ANN) for the prediction of NOx emissions from underground load–haul–dumping (LHD) vehicles powered by diesel engines is proposed. A Feed-Forward Neural Network, the Multi-Layer Perceptron... more
An approach based on an artificial neural network (ANN) for the prediction of NOx emissions from underground load–haul–dumping (LHD) vehicles powered by diesel engines is proposed. A Feed-Forward Neural Network, the Multi-Layer Perceptron (MLP), is used to establish a nonlinear relationship between input and output layers. The predicted values of NOx emissions have less than 15% error compared to the real values measured by the LHD onboard monitoring system by the standard sensor. This is considered quite good efficiency for dynamic behaviour prediction of extremely complex systems. The achieved accuracy of NOx prediction allows the application of the ANN-based “soft sensor” in environmental impact estimation and ventilation system demand planning, which depends on the number of working LHDs in the underground mine. The proposed solution to model NOx concentrations from mining machines will help to provide a better understanding of the atmosphere of the working environment and will ...
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In the production of critical parts for various machines and mechanisms, expensive structural steels are used alloyed with chromium, nickel, molybdenum, and vanadium. In practice, the wear resistance of parts, especially under severe... more
In the production of critical parts for various machines and mechanisms, expensive structural steels are used alloyed with chromium, nickel, molybdenum, and vanadium. In practice, the wear resistance of parts, especially under severe operating conditions, may be insufficient due to uneven microstructure and the content of retained austenite. Therefore, increasing the operational stability of various products made of alloy steels is an important task. The purpose of this work is to investigate the effect of isothermal hardening from the intermediate (γ+α)-area and the duration of deep cryogenic treatment on the structure formation and frictional wear resistance of 38CrNi3MoV steel. The isothermal hardening promotes the formation of the required multiphase microstructure of 38CrNi3MoV steel. The influence of the duration of deep cryogenic treatment on the microhardness, amount of retained austenite, fine structure parameters, and friction wear of 38CrNi3MoV steel are established. Comp...
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Monitoring and diagnostics of elements of the belt conveyor is a challenging task. One of the hardest aspects is dealing with objects such as rolling idlers that support the belt. They are distributed along the entire length of a... more
Monitoring and diagnostics of elements of the belt conveyor is a challenging task. One of the hardest aspects is dealing with objects such as rolling idlers that support the belt. They are distributed along the entire length of a conveyor, and their amount can easily reach thousands. In the ideal case, every idler should undergo in-situ monitoring, however, this is impractical. Hence, it is proposed to use remote sensing to acquire knowledge about some aspects of their condition. In particular, the authors propose to measure the rotational speed of the idler based on short video recordings. This data could be captured by mobile inspection robots, such as UAVs or UGVs, or even manually. Detecting the fact that the idler rotates with improper speed (lower than nominal), could indicate a developing fault of the internal bearing. An idler that rotates slower than it should also create additional friction between itself and the belt. This friction can increase the overall operational res...
The purpose of the presented study is to investigate the influence of the distance between three infinite circular cylinders in a tandem group on their aerodynamic coefficients and the general flow pattern. The questions of the numerical... more
The purpose of the presented study is to investigate the influence of the distance between three infinite circular cylinders in a tandem group on their aerodynamic coefficients and the general flow pattern. The questions of the numerical simulation of viscous incompressible flow around a group of cylinders in the tandem arrangement are considered. The numerical study of the flow around the group of cylinders is based on unsteady Reynolds-averaged Navier-Stokes equations. The results are presented as a visualization of the instantaneous flow parameters and the dependencies of the averaged drag coefficients on the distance between the cylinders. Following the previous investigations, the flow parameters were chosen in a little-studied range, corresponding to the Reynolds number of 120 for a standalone cylinder. The distances between the centers of neighboring cylinders ranged from 1.1 to 6.0 cylinder diameters. Three characteristic flow patterns are distinguished depending on the dist...
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Condition monitoring and diagnostics of minerals mining machines is a challenging task for operating companies and their maintenance staff. Conventional approaches based on measurements of vibration, temperature and other parameters are... more
Condition monitoring and diagnostics of minerals mining machines is a challenging task for operating companies and their maintenance staff. Conventional approaches based on measurements of vibration, temperature and other parameters are still not widely implemented in the mining industry due to non-stationary loading conditions. Registration of overloading and resonance modes is not sufficient by the electrical motors current in case of heavy mobile vehicles or stationary mounted mining machines having multi-body structure. Telemetric torque measurement tools installed in the drivetrains of mining machines allow accounting the variation of loads and gives valuable information on damages in geared transmissions. This paper represents the different methods of torque measurement and digital telemetry device under development based on strain gauges. The focus is on the functionality required for industrial applicability and issues in course of machines operation and maintenance. The add...
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The screw feeder design for the pre-compaction of bulk materials to be briquetted in a roll press is considered to increase the overall reliability. The relationship between the parameters of the screw feeder and its technological... more
The screw feeder design for the pre-compaction of bulk materials to be briquetted in a roll press is considered to increase the overall reliability. The relationship between the parameters of the screw feeder and its technological characteristics is investigated by the example of two fine-grained materials. A new mathematical model and design algorithm have been developed, which takes into account the properties of materials, the roller press parameters, the shape of the briquettes, and their deformation after compaction. The relationship between the pre-compaction pressure and the material stack height at the inlet is determined. The relations between the torque, the screw pitch, and the material stack height above the inlet, as well as the drive power and the screw pitch on productivity, are investigated. In experiments, using the proposed design, the compaction ratio of the peat increases by 22-27%, and hydrolyzed lignin – by 14-17%. The proposed approach allows for preventing dr...
The underground mining industry is at the forefront when it comes to unsafe conditions at workplaces. As mining depths continue to increase and the mining fronts move away from the ventilation shafts, gas hazards are increasing. In this... more
The underground mining industry is at the forefront when it comes to unsafe conditions at workplaces. As mining depths continue to increase and the mining fronts move away from the ventilation shafts, gas hazards are increasing. In this article, the authors developed a statistical polynomial model for nitrogen oxide (NOx) emission prediction of the LHD vehicle with a diesel engine. The best-achieved prediction accuracy by the 4th order polynomial model for 11 and 10 input variables is about 8% and 13%, respectively. It is comparable with the sensors’ accuracy of 10% at a stable regime of loading and 20% in the transient periods of operation. The obtained results allow planning of ventilation system capacity and power demand for the large fleet of vehicles in the deep underground mines.
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Predictive maintenance is increasingly popular in many branches, as well as in the mining industry; however, there is a lack of spectacular examples of its practice efficiency. Close collaboration between Omya Group and Wroclaw University... more
Predictive maintenance is increasingly popular in many branches, as well as in the mining industry; however, there is a lack of spectacular examples of its practice efficiency. Close collaboration between Omya Group and Wroclaw University of Science and Technology allowed investigation of the failure of the inertial vibrator’s bearing. The signals of vibration are captured from the sieving screen just before bearing failure and right after repair, when it was visually inspected after replacement. The additional complication was introduced by the loss of stable attachment of the vibrator’s shield, which produced great periodical excitation in each place of measurement on the machine. Such anomalies in the signals, in addition to falling pieces of material, made impossible the diagnostics by standard methods. However, the implementation of advanced signal processing techniques such as time–frequency diagrams, envelope spectrum, cyclic spectral coherence, orbits analysis, and phase spa...
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Theoretical investigations into the capabilities of a coaxial inertial drive with various operating modes for vibratory conveyors and screens are conducted in the paper. The coaxial inertial exciter is designed with one asynchronous... more
Theoretical investigations into the capabilities of a coaxial inertial drive with various operating modes for vibratory conveyors and screens are conducted in the paper. The coaxial inertial exciter is designed with one asynchronous electric motor and the kinematically synchronized rotation of two unbalanced masses. Three variants of angular speeds ratios, namely ω2/ω1 = 1, ω2/ω1 = –1, and ω2/ω1 = 2, are considered. Based on these relations, the circular, elliptical, and complex motion trajectories of the working members are implemented. In the first two cases, single-frequency harmonic oscillations take place. In the latter case, the double-frequency periodic oscillations are excited. The dynamic behavior of the motor’s shaft during its running-up and running-out is considered. The influence of the inertial parameters of the unbalanced rotors and the relative phase shift angle between them on the elliptical trajectories of the vibratory system’s mass center motion is investigated. ...
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Standard hydraulic breaking hammers are widely used for crushing oversized blasted materials and concrete structures demolition in industry. These hammers, installed in on-surface working excavators or stationary manipulators at the... more
Standard hydraulic breaking hammers are widely used for crushing oversized blasted materials and concrete structures demolition in industry. These hammers, installed in on-surface working excavators or stationary manipulators at the dumping points of underground conveyors, provide the required limited sizes of bulk materials and enable the safe operation of other equipment (screens, crushers). In parallel, hydraulic hammers have an alternative—fully electric hammers. This paper aims to review existing linear electric motor (LEM) hammers as an energy-saving and eco-friendly solution in industry. Global market analysis is presented with potential branches of LEM hammers. Several aspects for implementation—design optimization, dynamics simulation, machine control, and performance estimation—are considered. Different case studies for LEM-hammer application are given. The preliminary measurements are demonstrated on the electric hammer of Lekatech Company, which is intended for the minin...
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The amount of residual austenite in martensitic roll steels is an important technological parameter of heat treatment, which affects the performance properties of the rolls. But determining its amount in roll steels is a complex and not... more
The amount of residual austenite in martensitic roll steels is an important technological parameter of heat treatment, which affects the performance properties of the rolls. But determining its amount in roll steels is a complex and not fully solved scientific and technical problem. The aim of the work was to comparatively analyze the amount of residual austenite in the structure of alloy steel rolls by X-ray diffraction, ultrasonic methods and metallography analysis. However, the qualitative difference of microstructures in the content of the light phase - austenite, confirms the results of X-ray diffraction analysis. No correlation was found between the austenite content in the samples and their hardness. It was found that the X-ray method, based on the comparison of the intensities of the α- and γ-phase lines of iron, overestimates the value of the amount of residual austenite in some samples of roll steels. The results of the analysis of residual austenite by ultrasound rate sho...
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For the production of various machine-building products - rolling rolls, parts of power equipment, piercing mandrels - complex alloy steels containing chromium and a significant number of other deficient alloying elements (nickel,... more
For the production of various machine-building products - rolling rolls, parts of power equipment, piercing mandrels - complex alloy steels containing chromium and a significant number of other deficient alloying elements (nickel, vanadium, molybdenum) type 38Ni3CrMoV are used. The paper presents the results of research on the influence of modes of hardening and subsequent cryogenic treatment on the parameters of the structure, hardness and wear resistance of this steel. Visible changes in the microstructure of thermally improved steel samples during cryogenic treatment were not found, which can be explained by the high thermodynamic stability of the sorbitol structure and the practical absence of residual austenite due to its decomposition during high tempering. It is shown that cryogenic treatment of thermally improved 38Ni3CrMoV steel contributes to an increase in the hardness, toughness and wear resistance this steel (~3.8 %). In this case, there is a slight increase in the para...
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The study presents the dynamic analysis of the hydraulic cylinders operated in the powered roof support sections as an important part of the longwall underground mining complexes. This type of hydraulic unit is subjected to frequent shock... more
The study presents the dynamic analysis of the hydraulic cylinders operated in the powered roof support sections as an important part of the longwall underground mining complexes. This type of hydraulic unit is subjected to frequent shock impacts from the significant rock masses released on the top of mined caverns. Hydraulic props are equipped with safety valves with steel helical springs, which intend to reduce peak loads by the relief of internal pressure. These valves respond to shock with a time delay due to the limited velocity of the pressure wave inside the cylinder and an additional pipe of a small section, which restricts fluid flow in outer space. The new approach represented in this paper is based on mathematical modelling of the interaction of the hydraulic and mechanical parts and using additional signals to control safety valves. Detection of shock in advance (0.02-0.05 s) allows reducing pressure peaks by 30% and avoid failures. The challenges are the development of ...
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This paper intends to describe nonlinear effects occurring in rolling mills dynamics. That is necessarily for vibrations damping and reliable diagnostics of rolling mills equipment under non-stationary working conditions. Three types of... more
This paper intends to describe nonlinear effects occurring in rolling mills dynamics. That is necessarily for vibrations damping and reliable diagnostics of rolling mills equipment under non-stationary working conditions. Three types of nonlinear effects are investigated taking place in drivelines and stands of different design, namely, transient torsional vibrations in hot rolling mills, chatter vibrations in tandem cold rolling mills and parametrical vibrations in high-speed wire and rod rolling mills. The procedure is proposed for natural frequencies identification when short transient torque signals restrict application of the Fourier transform. Some considerations given on using nonlinear effects for wear diagnostics and vibrations control based on natural frequencies and modes analysis of multi-body systems. Keywords Rolling mills, nonlinear vibrations, chatter identification
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Large-scale vibrating screens are widely used in minerals processing industry. One of main components in any vibrating screen is a set of springs supporting the main body of machine with sieving material inside. These springs are... more
Large-scale vibrating screens are widely used in minerals processing industry. One of main components in any vibrating screen is a set of springs supporting the main body of machine with sieving material inside. These springs are subjected to cyclic loading and fatigue. Changing of their stiffness and subsequent failures have influence on the sieving efficiency and are difficult to predict, hence, online condition monitoring is required. Visual inspection and non-destructive diagnostic methods are not sufficient in this case. Noisy signals from vibration sensors installed on bearings supports of rotating unbalanced exciters are preferably used for diagnostics of spring failures. In this research, vibrating screen motion is represented by multi-DOF (degree-of-freedom) dynamic model, which accounts stochastic disturbances from incoming material and impacts on sieving decks. Specific features of vibration signals are analysed to identify springs deterioration modelled as the bilinear stiffness characteristics. Phase space plots (PSP) are considered as the promising method to recognise nonlinear behaviour of system under the presence of spring damage. Advantages are assessed of spring stiffness change and failures diagnostics as compared with other methods.
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An overview and developments are represented of the active vibration damping and control methods in the rolling mills. Chatter vibration in the tandem cold rolling mills are under investigation. Methods for its active control are... more
An overview and developments are represented of the active vibration damping and control methods in the rolling mills. Chatter vibration in the tandem cold rolling mills are under investigation. Methods for its active control are proposed. One of the main problems is discussed of the hot rolling mills related to dynamic torque monitoring in the geared drive trains. Methods and sensors are represented for the angular backlashes diagnostics and electric drive control.
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The problems are considered of the digital data processing of torsional loads and vibrations measurements to improve technological process stability and vibration diagnostics of rolling mills equipment of various types. As a theoretical... more
The problems are considered of the digital data processing of torsional loads and vibrations measurements to improve technological process stability and vibration diagnostics of rolling mills equipment of various types. As a theoretical basis for analyzing the dynamics of rolling mills it was accepted the non-linear equations of multi-body gear drives and rolls assemblies of mill stands. It is analyzed the characteristic signal patterns of nonlinear systems under transient conditions and waveforms as diagnostic features and conditions of rolling stability. Examples are given of a possible implementation of the developed diagnostic techniques on the real objects.
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Винахід належить до галузі металургії та машинобудування, а саме-до способу термічної обробки виробів з інструментальної сталі і може бути використаний для виготовлення ріжучого інструмента та зносостійких деталей металургійного... more
Винахід належить до галузі металургії та машинобудування, а саме-до способу термічної обробки виробів з інструментальної сталі і може бути використаний для виготовлення ріжучого інструмента та зносостійких деталей металургійного обладнання, таких як штампи, валки, калібри та ін.
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Cellular automata of 3-D structure is developed for parallel processing of binary data with high efficiency.
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The invention relates to the field of technical operation of machines, namely to the diagnosis methods of wear of the elements of transmissions, and it can be used on the rolling mills for their maintenance according to the actual wear of... more
The invention relates to the field of technical operation of machines, namely to the diagnosis methods of wear of the elements of transmissions, and it can be used on the rolling mills for their maintenance according to the actual wear of the main line of the drive of stands. In the rolling mills the vibration is measured during increase of the load moment on the working shafts, the amplitudes and phases of oscillations at resonant frequencies of entire twisting system of transmission are determined, the absolute values of the wear of separate units are calculated according to the difference of measured parameters of oscillations and calculated on the linear model without clearances. The technical result consists in the possibility to carry out the real-time control (monitoring) of equipment condition taking into account actual wear.
Research Interests: Computer-Aided Diagnosis, Torsional Vibration Analysis of Geared Systems, Prognosis and health management, Nondestructive testing, Condition monitoring and fault diagnosis of electric machinery, and 2 moreSignal Analysis and Pattern Identification and Mechanical Vibration and Machinery System Dynamics
The proposed method for diagnosing the bearings of the drive mechanism shaft of a rolling mill consists in repeatedly measuring vibrations of the bearings within the period of the increase of the load at the working rolls of the mill,... more
The proposed method for diagnosing the bearings of the drive mechanism shaft of a rolling mill consists in repeatedly measuring vibrations of the bearings within the period of the increase of the load at the working rolls of the mill, with a specified time interval between the measurements, determining the natural vibrations and harmonic components of the vibrations, determining the degree of wear and tear of the bearings and clearances in the bearings by the amplitude and phase of the vibrations. The proposed method is distinctive by its enhanced accuracy.
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The proposed method for monitoring fluctuations of load on the drive mechanism of a rolling mill consists in measuring the output signal of the current transducer of the driving motor within the period of the increase of the load on the... more
The proposed method for monitoring fluctuations of load on the drive mechanism of a rolling mill consists in measuring the output signal of the current transducer of the driving motor within the period of the increase of the load on the working rolls of the mil, measuring the output signal of the low-pass filter, which is connected to the current transducer, with a cutoff frequency less than one-half of the natural vibration frequency of the drive mechanism, determining the difference between the output signal of the transducer and the output signal of the low-pass filter, and determining the fluctuations of the load torque by the amplitude of the said signal difference. The proposed method is distinctive by its enhanced accuracy.
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SUBSTANCE: forming of control signal at moment preceding vibrations transition into sympathetic phase. The moment preceding development of hazardous vibrations is determined from combined or separate occurring of complex of conditions. To... more
SUBSTANCE: forming of control signal at moment preceding vibrations transition into sympathetic phase. The moment preceding development of hazardous vibrations is determined from combined or separate occurring of complex of conditions. To them the following can be related: reaching the limit (threshold) values of mean square deviations of maximums of the vibration acceleration signal specter at several stands of the mill, starting from the last stand, and coefficients of correlation of vibration acceleration signals for at minimum in one pair of adjacent stands.
EFFECT: upgraded quality of rolled flats, increased speed of rolling and also reduced rolls wear and stands idle time.
EFFECT: upgraded quality of rolled flats, increased speed of rolling and also reduced rolls wear and stands idle time.
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Cryogenic cooling systems is developed based on liquid nitrogen for cold rolling mills to increase service time of work rolls and to improve surface quality of the thin rolled strips. System is applicable to any other metal cutting... more
Cryogenic cooling systems is developed based on liquid nitrogen for cold rolling mills to increase service time of work rolls and to improve surface quality of the thin rolled strips. System is applicable to any other metal cutting machines.
Digitally controlled cryogenic cryostat is developed for deep cooling up to -196C and heating up to +170C of tool samples for their cyclic quenching and tempering.
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Problem of chatter vibrations encountered worldwide in rolling mills was theorized and experimentally investigated in an industrial skin pass mill. The new nonlinear model of friction-induced vibrations was developed for rolling dynamics... more
Problem of chatter vibrations encountered worldwide in rolling mills was theorized and experimentally investigated in an industrial skin pass mill. The new nonlinear model of friction-induced vibrations was developed for rolling dynamics identification, allowing calculation and prediction of thin strips periodical defects (chatter marks). Mill control approach is proposed to avoid chatter vibrations.
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Temperature relation of interlamellar spacing of pearlite, with the supercooling in carbon steels, based on previously theoretically foundation has been determined by the pearlite and bainite phase volumes in the alloy steels from the... more
Temperature relation of interlamellar spacing of pearlite, with the supercooling in carbon steels, based on previously theoretically foundation has been determined by the pearlite and bainite phase volumes in the alloy steels from the degree of supercooling. Calculated data corresponds to the experimental results with a sufficient accuracy. Development of a diffusion model of discontinuous transformation of austenite makes possible to theoretically explain formation of bainitic ferrite in low carbon steel in the same temperature range. These models