The diagnostics of sieving screens and other vibratory machines is the most complicated scientifi... more The diagnostics of sieving screens and other vibratory machines is the most complicated scientific and engineering task due to a permanent periodical (technological) excitation and stochastic impulsive (non-Gaussian) disturbances from the falling pieces of bulk materials, which directly influence the reliability of damage alarming in the condition monitoring systems. In the design of sieving screens, the most critical parts are supporting springs, inertial vibrators with special types of bearings, and bolted joints, which are subjected to severe cyclic fatigue and experience hardly detected loosening. All these elements require frequently scheduled inspections. To provide prevention of abrupt failures and reduction of maintenance costs with simultaneous energy saving and output product quality, a new approach is developed, which is based on multi-body nonlinear dynamical models and advanced methods of signal processing with an emphasis on transient periods of
Wheeled vibration-driven platforms have taken a prominent place among mobile robotic systems. Num... 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.
ABSTRACT The excessive dynamic loads and shock vibration are particular for the hot rolling mills... 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.
Condition monitoring and diagnostics of minerals mining machines is a challenging task for operat... 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.
IOP Conference Series: Earth and Environmental Science
The ability of a knowledge-oriented system to learn requires the selection and organization of da... 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.
Resonant and out-of-resonance vibration machines are investigated operating under conditions of n... 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.
The diagnostics of sieving screens and other vibratory machines is the most complicated scientifi... more The diagnostics of sieving screens and other vibratory machines is the most complicated scientific and engineering task due to a permanent periodical (technological) excitation and stochastic impulsive (non-Gaussian) disturbances from the falling pieces of bulk materials, which directly influence the reliability of damage alarming in the condition monitoring systems. In the design of sieving screens, the most critical parts are supporting springs, inertial vibrators with special types of bearings, and bolted joints, which are subjected to severe cyclic fatigue and experience hardly detected loosening. All these elements require frequently scheduled inspections. To provide prevention of abrupt failures and reduction of maintenance costs with simultaneous energy saving and output product quality, a new approach is developed, which is based on multi-body nonlinear dynamical models and advanced methods of signal processing with an emphasis on transient periods of
Wheeled vibration-driven platforms have taken a prominent place among mobile robotic systems. Num... 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.
ABSTRACT The excessive dynamic loads and shock vibration are particular for the hot rolling mills... 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.
Condition monitoring and diagnostics of minerals mining machines is a challenging task for operat... 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.
IOP Conference Series: Earth and Environmental Science
The ability of a knowledge-oriented system to learn requires the selection and organization of da... 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.
Resonant and out-of-resonance vibration machines are investigated operating under conditions of n... 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.
World Multidisciplinary Earth Sciences Symposium (WMESS 2019) IOP Conference Series: Earth and Environmental Science , 2019
Large-scale vibrating screens are widely used in minerals processing industry. One of main compon... 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.
9-й Міжнародний симпозіум українських інженерів-механіків (МСУІМЛ–9), 20-22 травня 2009 р., Львiв, 2009
An overview and developments are represented of the active vibration damping and control methods ... 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.
Международная IX конференция «Фундаментальные и прикладные проблемы надежности и диагностики машин и механизмов». Институт проблем машиноведения (ИПМаш) РАН, 25-27 окт. 2009, СПб., 2009
Международная IX конференция «Фундаментальные и прикладные проблемы надежности и диагностики машин и механизмов». Институт проблем машиноведения (ИПМаш) РАН, 25-27 окт. 2009, СПб, 2009
Сб. трудов международной конференции "Надежность металлургического оборудования" RME-2013. 28-31 окт. 2013, НМетАУ, Днепр, 2013
The problems are considered of the digital data processing of torsional loads and vibrations meas... 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.
Винахід належить до галузі металургії та машинобудування, а саме-до способу термічної обробки вир... 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.
Cellular automata of 3-D structure is developed for parallel processing of binary data with high ... more Cellular automata of 3-D structure is developed for parallel processing of binary data with high efficiency.
The invention relates to the field of technical operation of machines, namely to the diagnosis me... 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.
The proposed method for diagnosing the bearings of the drive mechanism shaft of a rolling mill co... 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.
The proposed method for monitoring fluctuations of load on the drive mechanism of a rolling mill ... 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.
SUBSTANCE: forming of control signal at moment preceding vibrations transition into sympathetic p... 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.
Cryogenic cooling systems is developed based on liquid nitrogen for cold rolling mills to increas... 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 ... more 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.
Problem of chatter vibrations encountered worldwide in rolling mills was theorized and experiment... 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.
Temperature relation of interlamellar spacing of pearlite, with the supercooling in carbon steels... 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
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EFFECT: upgraded quality of rolled flats, increased speed of rolling and also reduced rolls wear and stands idle time.