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Journal articles on the topic 'Dynamics of rotating machines'

Author: Grafiati

Published: 31 May 2025

Last updated: 31 July 2025

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1

Мудров, Александр, and Aleksandr Mudrov. "DYNAMICS OF STARTING MACHINES." Vestnik of Kazan State Agrarian University 13, no. 4 (2018): 119–23. http://dx.doi.org/10.12737/article_5c3de39987d113.47195585.

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The operation of any machine includes three periods of operation: start and acceleration, steady motion, braking and stopping. During periods of start-up and braking, large dynamic loads occur, adversely affecting the strength of machine elements and the overloading of the drive source. The purpose of the study is to determine the dynamic loads during the start-up of the machine and to find options for reducing them. The mathematical values of dynamic loads are determined by the example of a spatial mixer from rotating elements of the drive. It has been established that the dynamic moments fro

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Jiang, Bing Hua, Li Fang, and Hang Biao Guo. "The Tapping Machine Mathematical Modeling Simulation Study." Applied Mechanics and Materials 373-375 (August 2013): 2073–77. http://dx.doi.org/10.4028/www.scientific.net/amm.373-375.2073.

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Based on the tapping machines special structural features and practices, from both directions of rotation and impact established the tapping machine mechanism rotating borer and impact dynamic mathematical model, analysed the effect of different tapping machines parameters on the model itself, simulated the model with inputting wide pulse signal, the simulation results show that: firstly, the tapping machine model established in this paper is reasonable; secondly, increase the damping coefficient of the blast furnace, the tapping machines rotating borer rotation speed and impact attenuation sp

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Penny, J. E. T., and Michael I. Friswell. "The Dynamics of Rotating Machines with Cracks." Materials Science Forum 440-441 (November 2003): 311–20. http://dx.doi.org/10.4028/www.scientific.net/msf.440-441.311.

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4

Zapoměl, Jaroslav. "Special Issue on Rotor Dynamics: Theoretical Analysis, Computer and Experimental Modelling, Measurements." Applied Sciences 13, no. 20 (2023): 11551. http://dx.doi.org/10.3390/app132011551.

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5

Podrigalo, Mikhail, Andriy Kashkanov, Mykhailo Kholodov, and Andriy Poberezhnyi. "Dynamics of machines with ideal inertial motion." Journal of Mechanical Engineering and Transport 14, no. 2 (2022): 97–102. http://dx.doi.org/10.31649/2413-4503-2021-14-2-97-102.

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The term "inertioid" and its first design in 1936 was invented by engineer V. N. Tolchin. Despite the demonstration of unsupported motion using a physical model, the mystery of the inertioid has existed for almost a century. There are several theories explaining the motion of the inertioid (or mechanisms with inertial motion). These theories include the theory of friction, which proves that the movement of the device occurs due to the difference between the coefficients of friction and the coefficients of rolling resistance in contact between the bottom of the machine and the road. In some wor

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Dhurvey, Akanksha. "Transmissibility Analysis of a Regenerated Rotor System." International Journal for Research in Applied Science and Engineering Technology 9, no. 8 (2021): 1102–7. http://dx.doi.org/10.22214/ijraset.2021.37542.

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Abstract: The aim of this paper is to represents a dynamic behavior of rotor bearing system wirth simply supported beam for three different position disc. rotating machinery such as compressors, turbines, pumps, jet engines, turtobo chargers, etc. are subject to vibrations. rotating machines are operated in very high speed and they are subjected to some unbalance force due to vibration from that machine pass to the foundation of machine.so the analysis of the dynamics parameter of rotor it is important to determine force transmissibility, natural frequency, critical speed and amplitudes of rot

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Espinoza-Sepulveda, Natalia, and Jyoti Sinha. "Mathematical Validation of Experimentally Optimised Parameters Used in a Vibration-Based Machine-Learning Model for Fault Diagnosis in Rotating Machines." Machines 9, no. 8 (2021): 155. http://dx.doi.org/10.3390/machines9080155.

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Mathematical models have been widely used in the study of rotating machines. Their application in dynamics has eased further research since they can avoid time-consuming and exorbitant experimental processes to simulate different faults. The earlier vibration-based machine-learning (VML) model for fault diagnosis in rotating machines was developed by optimising the vibration-based parameters from experimental data on a rig. Therefore, a mathematical model based on the finite-element (FE) method is created for the experimental rig, to simulate several rotor-related faults. The generated vibrati

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Vansteenkiste, A., M. Loccufier, B. Vervisch, and P. De Baets. "Modal analysis and testing of rotating machines for predictive maintenance: effect of gyroscopic forces." International Journal Sustainable Construction & Design 3, no. 2 (2012): 116–22. http://dx.doi.org/10.21825/scad.v3i2.20564.

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Through the year’s preventive maintenance, which is based on vibration measurements hasgrown in importance to reduce costs. However in industry nowadays there is still a great need for goodanalytical prediction models that describe the dynamics of rotating structures. In this paper it is first shownhow to build a model for for undamped gyroscopic systems. Secondly the model is analysed and used tomake a parametric study for the design a test rig. It is found that the third and the fourth eigenfrequencychangein function of the rotation speed due to the gyroscopic effect. Finally the experimenta

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Gizelska, Małgorzata, Dorota Kozanecka, and Zbigniew Kozanecki. "Diagnostics of the Mechatronic Rotating System." Key Engineering Materials 588 (October 2013): 101–8. http://dx.doi.org/10.4028/www.scientific.net/kem.588.101.

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Nowadays rotating systems are equipped with diagnostic systems that are based on collecting and recording measurement data and that process a huge amount of data during the machine operation. An analysis of these data and their interpretation, as well as finding a correlation between process parameters and dynamics of the machine is a very important problem. In the paper, a concept and selected procedures of the specialized software using advanced information technology for the diagnostic system dedicated for systems of rotating machines with active magnetic bearings will be presented. It is u

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El-Borhamy, Mohamed, Essam Eddin M. Rashad, Ismail Sobhy, and M. Kamel El-Sayed. "Modeling and Semi-Analytic Stability Analysis for Dynamics of AC Machines." Mathematics 9, no. 6 (2021): 644. http://dx.doi.org/10.3390/math9060644.

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In this article, a semi-analytical technique is proposed to predict stable sustained periodic responses of AC electrical machines. Based on such desired outputs, the proper selections of machine variables are captured, such as the perturbation parameter arisen from the relative movement between the stationary and rotating parts. Compared to the experimental results, the derived analytical results are relatively well-fitted with the studied practical cases.

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Kaliński, Krzysztof J., and Marek A. Galewski. "Simulation and Experiments of High Speed Machining Vibration Monitoring with Variable Spindle Velocity." Solid State Phenomena 164 (June 2010): 285–90. http://dx.doi.org/10.4028/www.scientific.net/ssp.164.285.

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The paper is devoted to vibration monitoring of rotating tools in modern milling machines. Dynamic analysis of slender ball-end milling process was performed and dynamics of the controlled structure was described. Instantaneous change in the spindle speed is applied in order to reduce vibration level. The method of vibration monitoring by means of spindle speed optimal-linear control was developed and implemented with success. Vibration monitoring during high speed milling was performed on the basis of results of computer simulation. These results were verified during experimental investigatio

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Li, Jun, Hongcai Li, Yingyi Chen, et al. "Research on Ditching Mechanism of Self-Excited Vibration Ditching Machine." Agronomy 13, no. 3 (2023): 905. http://dx.doi.org/10.3390/agronomy13030905.

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A vibration ditching machine is a machine that can effectively reduce ditching resistance and energy consumption. In this paper, taking a self-developed, self-excited vibration ditching machine as the research object, we explore its internal dynamic vibration characteristics upon excitement when ditching, which reduces its resistance and energy consumption. The vibration characteristics of a ditching machine with three degrees of freedom (Y, Ry, and Rx directions), which are generated by the vibration of the self-excited ditching machine, are evaluated; the rotating speed, spring stiffness, sp

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13

Li, Shenghu. "Configuration of Jacobian Matrix in Steady-State Voltage Stability Analysis Based on Rotor Flux Dynamics of Rotating Machines." International Journal of Emerging Electric Power Systems 14, no. 3 (2013): 239–44. http://dx.doi.org/10.1515/ijeeps-2012-0013.

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Abstract In the existing literatures, modal analysis for steady-state voltage stability is based on the reduced Jacobian matrix, i.e. active power equations are eliminated, and reactive power equations of the constant power/voltage buses (PV buses) are ignored in the polar coordinate expression, which is actually designed for voltage controllability, but questionable for voltage stability.In this article, power outputs of the rotating machines are newly decomposed to the steady-state and dynamic components, with the latter proportional to derivative of the rotor flux. Therefore, neither the ac

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Komorska, Iwona, and Andrzej Puchalski. "Rotating Machinery Diagnosing in Non-Stationary Conditions with Empirical Mode Decomposition-Based Wavelet Leaders Multifractal Spectra." Sensors 21, no. 22 (2021): 7677. http://dx.doi.org/10.3390/s21227677.

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Diagnosing the condition of rotating machines by non-invasive methods is based on the analysis of dynamic signals from sensors mounted on the machine—such as vibration, velocity, or acceleration sensors; torque meters; force sensors; pressure sensors; etc. The article presents a new method combining the empirical mode decomposition algorithm with wavelet leader multifractal formalism applied to diagnosing damages of rotating machines in non-stationary conditions. The development of damage causes an increase in the level of multifractality of the signal. The multifractal spectrum obtained as a

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15

Wauer, Jo¨rg. "On the Dynamics of Cracked Rotors: A Literature Survey." Applied Mechanics Reviews 43, no. 1 (1990): 13–17. http://dx.doi.org/10.1115/1.3119157.

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Propagating fatigue cracks can have detrimental effects on the reliability of rotating machinery. An early crack warning can considerably extend the durability of these very expensive machines, increasing their reliability at the same time. Vibration monitoring as a means of detecting crack initiation has been receiving much interest. A detailed study of the vibrational behavior of cracked rotating shafts, therefore, is an important problem for engineers working in the area of the dynamics of machines. This article presents a review of the field of the dynamics of cracked rotors, including the

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16

Mavlonova, Iroda, Mansur Akhmetjanov, Munira Vokhidova, Sirojiddin Fayziev, and Sayyidaposhsho Shokirova. "Experimental studies of the dynamics of the proposed design of the presser foot with an additional conical spring." Journal of Physics: Conference Series 2373, no. 2 (2022): 022047. http://dx.doi.org/10.1088/1742-6596/2373/2/022047.

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Abstract This article is devoted to light industry equipment, namely sewing machines that are utilized in the manufacture of clothing, footwear and knitwear. The disadvantage of this design is the lack of vibration damping of the trigger and rod caused by changes in the thickness and structure of the sewing material, the impact resistance of iron and the incompatibility of the rotating elements in the sewing machine.

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Robertsson, A. C., E. Nordin, I. Simonsson, and H. Bernhoff. "Cost and Efficiency analysis of the Secondary electric machine in a CRAFT wind turbine." Journal of Physics: Conference Series 2875, no. 1 (2024): 012005. http://dx.doi.org/10.1088/1742-6596/2875/1/012005.

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Abstract Floating offshore wind turbines are ideal for deeper waters, providing access to stronger and more stable winds. The Counter-Rotating Axis Floating Tilting (CRAFT) turbine features a unique design with two counter-rotating turbines on a tilted vertical shaft and two independent electrical machines submerged below sea level. The primary generator, connected to both turbines, includes counter-rotation which doubles the relative torque, while the secondary machine controls the upper turbine. This study examines the impact of primary and secondary machine efficiency on electricity generat

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18

Sepulveda, Natalia Espinoza, and Jyoti Sinha. "Parameter Optimisation in the Vibration-Based Machine Learning Model for Accurate and Reliable Faults Diagnosis in Rotating Machines." Machines 8, no. 4 (2020): 66. http://dx.doi.org/10.3390/machines8040066.

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Artificial intelligence (AI)-based machine learning (ML) models seem to be the future for most of the applications. Recent research effort has also been made on the application of these AI and ML methods in the vibration-based faults diagnosis (VFD) in rotating machines. Several research studies have been published over the last decade on this topic. However, most of the studies are data driven, and the vibration-based ML (VML) model is generally developed on a typical machine. The developed VML model may not predict faults accurately if applied on other identical machines or a machine with di

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19

Ma, Jiaojiao, Chao Fu, Zhaoli Zheng, Kuan Lu, and Yongfeng Yang. "The Effects of Interval Uncertainties on Dynamic Characteristics of a Rotor System Supported by Oil-Film Bearings." Lubricants 10, no. 12 (2022): 354. http://dx.doi.org/10.3390/lubricants10120354.

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Rotating systems equipped with oil-film bearings are critical and common in many industrial machines. There are various non-random uncertainties in such fluid-lubricated dynamic systems. It is important to quantify the effects of uncertainties without adequate statistical information on the dynamics of rotor-bearing systems. In this paper, a rotor system with oil-film bearings at both ends is investigated considering many interval uncertainties. The rotating system is modeled in a deterministic sense. The Chebyshev interval method is used to track the propagation of different uncertainties. De

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20

Khajiyeva, Lelya, and Almatbek Kydyrbekuly. "About Dynamics of Muffs from Physically Nonlinear Material." Advanced Materials Research 702 (May 2013): 291–96. http://dx.doi.org/10.4028/www.scientific.net/amr.702.291.

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The paper is devoted to simulation of nonlinear dynamic processes in mechanical systems with nonlinear characteristics of the physical nature. As an example torsional oscillation of rubber-cord muff, which connects rotating shafts of a drive of machines, is investigated. Influence of nonlinear properties of a muff on amplitude-frequency characteristics of a kinematic circuit is established. The research results are in accord with experimental data of other works.

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21

Friswell, Michael I., and Yong Yong He. "Smart Rotating Machines for Condition Monitoring." Key Engineering Materials 413-414 (June 2009): 423–30. http://dx.doi.org/10.4028/www.scientific.net/kem.413-414.423.

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The concept that changes in the dynamic behaviour of a rotor could be used for general fault detection and monitoring is well established. Current methods rely on the response of the machine to unbalance excitation during run-up, run-down or normal operation, and are mainly based on pattern recognition approaches. Of all machine faults, probably cracks in the rotor pose the greatest danger and research in crack detection has been ongoing for the past 30 years. For large unbalance forces the crack will remain permanently open and the rotor is then asymmetric, which can lead to stability problem

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22

Abouelregal, Ahmed E., Hamid Mohammad-Sedighi, Seyed Ali Faghidian, and Ali Heidari Shirazi. "TEMPERATURE-DEPENDENT PHYSICAL CHARACTERISTICS OF THE ROTATING NONLOCAL NANOBEAMS SUBJECT TO A VARYING HEAT SOURCE AND A DYNAMIC LOAD." Facta Universitatis, Series: Mechanical Engineering 19, no. 4 (2021): 633. http://dx.doi.org/10.22190/fume201222024a.

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In this article, the influence of thermal conductivity on the dynamics of a rotating nanobeam is established in the context of nonlocal thermoelasticity theory. To this end, the governing equations are derived using generalized heat conduction including phase lags on the basis of the Euler–Bernoulli beam theory. The thermal conductivity of the proposed model linearly changes with temperature and the considered nanobeam is excited with a variable harmonic heat source and exposed to a time-dependent load with exponential decay. The analytic solutions for bending moment, deflection and temperatur

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23

Ładziński, Radosław. "Dynamic Systems with a Finite Degrees of Freedom Number." Archives of Control Sciences 24, no. 2 (2014): 207–34. http://dx.doi.org/10.2478/acsc-2014-0013.

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Abstract Taking as a starting point the law of conservation of the total energy of the system, and introducing two basic state functions - the Lagrangian and the Rayleigh function, the general form of the equation of motion for any dynamic system with a finite number of degrees of freedom is derived. The theory is illustrated by considering the rotating - type electromechanical energy converter with six degrees of freedom being the model of all essentially important types of DC and AC machines, including rotating power amplifiers, induction - and synchronous type motors - all of them discussed

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Kocharla, Ravi Prakash Babu, Murahari Kolli, and Muralimohan Cheepu. "Real-Time Detection of Faults in Rotating Blades Using Frequency Response Function Analysis." Applied Mechanics 4, no. 1 (2023): 356–70. http://dx.doi.org/10.3390/applmech4010020.

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Turbo machines develop faults in the rotating blades during operation in undesirable conditions. Such faults in the rotating blades are fatigue cracks, mechanical looseness, imbalance, misalignment, etc. Therefore, it is crucial that the blade faults should be detected and diagnosed in order to minimize the severe damage of such machines. In this paper, vibration analysis of the rotating blades is conducted using an experimental laboratory setup in order to develop a methodology to detect faults in the rotating blades. The faults considered for the study include cracks and mechanical looseness

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Déa, Thales Henrique Gomes, Rodrigo Francisco Borges Lourenco, Rafael de Oliveira Silva, Michael Dowglas de Gois Silva, Fábio Roberto Chavarette, and Roberto Outa. "ANÁLISE DINÂMICA EXPERIMENTAL DE ROTORES DESBALANCEADOS." COLLOQUIUM EXACTARUM 13, no. 3 (2021): 13–18. http://dx.doi.org/10.5747/ce.2021.v13.n3.e365.

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Rotating machines in motion usually produce dynamic forces that diffuse to the ends that support them, such efforts can lead to disadvantageous reactions to the operation of the machine, as well as unbalance or misalignment that can damage the shaft-rotor assembly or the elements directly linked to it. The objective of this project is to develop a mechanical and experimental system that enables the testing and data acquisition of a rotating machine and build a computational algorithm to generate amplitude and velocity diagrams as a function of time and compare the dynamic behavior of a vibrati

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Wang, Rui, Yuefang Wang, and Xinglin Guo. "Rotordynamic Analysis for a Turbo-Machine with Fluid-Solid Interaction and Rotation Effects." Mathematical Problems in Engineering 2011 (2011): 1–11. http://dx.doi.org/10.1155/2011/921095.

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The rotordynamics and fluid dynamics of a turbo-machine considering the effect of fluid-solid interaction (FSI) are numerically investigated using finite element software ADINA. The iterative method is adopted in computation of coupled fields of displacement and fluid. What distinguishes the present study from previous ones is the use of ADINA's rotational meshes and the FSI interface that separates the rotor surface from its surrounding fluid. The rotor's center orbit and frequency response as well as the transient fluid dynamics are obtained with various axial flow speeds. By including real

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Marczuk, Andrzej, Jacek Caban, Alexey V. Aleshkin, Petr A. Savinykh, Alexey Y. Isupov, and Ilya I. Ivanov. "Modeling and Simulation of Particle Motion in the Operation Area of a Centrifugal Rotary Chopper Machine." Sustainability 11, no. 18 (2019): 4873. http://dx.doi.org/10.3390/su11184873.

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The article presents approaches to the formation of a general computational scheme for modeling (simulating) the particle motion on an axisymmetric rotating curved surface with a vertical axis of rotation. To describe the complex particle motion over a given surface, the fundamental equation of particle dynamics in a non-inertial reference frame was used, and by projecting it onto the axes of cylindrical coordinates, the Lagrange’s differential equations of the first kind were obtained. According to the proposed algorithm in C#, an application was developed that enables graphical and numerical

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Wen, Baogang, Hongjun Ren, Hao Zhang, and Qingkai Han. "Experimental investigation of cage motions in an angular contact ball bearing." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 231, no. 8 (2017): 1041–55. http://dx.doi.org/10.1177/1350650116689457.

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The commonly known effects of both the rotating speeds and external loads on the bearing dynamics or life behaviors are mostly caused by its cage dynamics, because of the complicated contact and collision interactions between the cage and other parts such as the inner or outer rings and balls. In this paper, experimental investigation of dynamic motions of a cage is carried out under various rotating speeds and external loads in a ball bearing. On a bearing test rig, the cage motions in axial and radial directions are measured by use of eddy transducers installed inside the bearing house and t

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Ivashnev, Mikhail, and Anastasiya Tulina. "Study of parameters of the working body of the forest machine for removal of woody shrub vegetation." BIO Web of Conferences 145 (2024): 03013. http://dx.doi.org/10.1051/bioconf/202414503013.

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The process of reforestation consists of a set of activities aimed at restoring destroyed or damaged forests. The process of forest restoration is a long one. For successful reforestation it is necessary to carry out measures ensuring effective establishment and growth of forest crops. These activities are carried out in a mechanized way using forest machines with different working bodies. Forest machines for removal of woody and shrub vegetation allow to carry out reforestation works and silvicultural care in forestry. The forest machine with a flat-rotating working body having a vertical axi

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Chin, Patrick, Jose M. DePavia, and Stephen C. Veldhuis. "Practical Estimation of Machine Tool Spindle Dynamics for Maintenance Decision Making." Applied Sciences 14, no. 10 (2024): 4266. http://dx.doi.org/10.3390/app14104266.

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Condition-based maintenance of a machine tool spindle unit is known to reduce the total cost of operation in a manufacturing environment. However, standard vibration monitoring thresholds, which are based only on average vibration energy levels, do not account for the machine’s dynamics, such as dynamic stiffness and damping ratios, which, ultimately, control the final quality of a machined workpiece. In this study, a new mechanical device is proposed for the estimation of spindle dynamics characteristics through measurement of the frequency response function (FRF) of the spindle. The device i

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31

Marinov, Boycho. "Full Dynamic Reactions in the Basic Shaft Bearings of Big Band Saw Machines." Journal of Theoretical and Applied Mechanics 43, no. 1 (2013): 3–18. http://dx.doi.org/10.2478/jtam-2013-0001.

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Abstract The band saws machines are a certain class woodworking machines for longitudinal or transversal cutting as well as for curvilinear wood cutting. These machines saw the wood through a band-saw blade and two feeding wheels. These wheels usually are very large and they are produced with inaccuracies. The centre of mass of the disc is displaced from the axis of rotation of the distance e (eccentricity) and the axis of the disk makes an angle with the axis of rotation. In this paper, the dy- namic reactions in the bearings of the basic shaft, which drives the band saw machines, are analyze

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Ramos, Leandro Ito, Douglas Jhon Ramos, and Gregory Bregion Daniel. "Evaluation of textured journal bearings under dynamic operating conditions in rotating machinery." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234, no. 6 (2019): 842–57. http://dx.doi.org/10.1177/1350650119887568.

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In order to obtain rotating machinery with improved energy efficiency, the approach of surface texturing journal bearings has been adopted to reduce the viscous dissipation in the lubricant. A possible reduction in shear viscous forces in the bearings of rotating machines could reduce the amount of heat released along its operation, resulting in a lower operating temperature that tends to improve journal bearings performance and the machine’s energetic efficiency. Thus, this work aims to investigate the texturing of journal bearings under dynamic loading conditions, considering the application

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Essen, Donald, and Luqyana Luqyana. "Analysis and Dynamic Behavior of Portal Structure Due Rotating Machines Loads." Journal of Applied Science, Engineering, Technology, and Education 1, no. 2 (2020): 131–40. http://dx.doi.org/10.35877/454ri.asci1240.

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Rotating machines can be regarded as live load when the machine is operating at a period of time at a certain speed will result in vibration on the structure. The purpose of this research to perform dynamic analysis of the portal structure in order to know how much influence the dynamic load due to the machine that is operating on the structure and get a large ratio of displacement, velocity, and acceleration when the load is given a static and dynamic load. This dynamic analysis is done with the help of SAP2000 V.20.0.2 software. From the results of this study, it was found that the first ten

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Karpenko, Mykola, Pavel Ževžikov, Michał Stosiak, Paulius Skačkauskas, Anna Borucka, and Maksym Delembovskyi. "Vibration Research on Centrifugal Loop Dryer Machines Used in Plastic Recycling Processes." Machines 12, no. 1 (2024): 29. http://dx.doi.org/10.3390/machines12010029.

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This study investigates the vibrations of centrifugal loop dryer machines used in plastic recycling processes. These machines are characterized by large uncertainties, high vibration, and unmodeled dynamics, making the design and maintenance of real-time state estimators for their operational conditions difficult. The present study includes an analysis of the centrifugal loop dryer machines’ vibration characteristics and their influence on operation results based on vibration analysis, frequency response analysis, and expert advice. Two identical loop dryers installed and operated in parallel

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Hammza, Tariq M., Ehab N. Abas, and Nassear R. Hmoad. "Optimum Design of Journal Bearings Dimensions for Rotating Machines." Engineering and Technology Journal 38, no. 10A (2020): 1481–88. http://dx.doi.org/10.30684/etj.v38i10a.1093.

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The values of Many parameters which involve in the design of fluid film journal bearings mainly depend on the bearing applied load when using the conventional design method to design the journal bearings, in this study, as well as applied bearing load, the dynamic response and critical speed have been used to calculate the dimensions of journal bearings. In the field of rotating machine, especially a heavy-duty rotating machines, the critical speed and response are the main parameters that specify bearing dimensions. The bearing aspect ratio (bearing length to bore diameter) and bearing cleara

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Boycho Marinov. "Full dynamic reactions in the main links of big band saw machines." Global Journal of Engineering and Technology Advances 9, no. 3 (2021): 092–104. http://dx.doi.org/10.30574/gjeta.2021.9.3.0162.

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In this study, the full dynamic reactions in the bearing supports of the leading wheel of big band saw machines are determined. These reactions are caused by both the external loads and the kinematic and mass characteristics of the rotating disk. Expressions for calculating the dynamic reactions caused by external forces and moments that occur in the operating mode are obtained. The influence of the kinematic and mass characteristics of the rotating disk is studied and expressions for calculating the dynamic reactions caused by these characteristics are obtained. Expressions for calculating th

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Boycho, Marinov. "Full dynamic reactions in the main links of big band saw machines." Global Journal of Engineering and Technology Advances 9, no. 3 (2021): 092–104. https://doi.org/10.5281/zenodo.5813489.

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In this study, the full dynamic reactions in the bearing supports of the leading wheel of big band saw machines are determined. These reactions are caused by both the external loads and the kinematic and mass characteristics of the rotating disk. Expressions for calculating the dynamic reactions caused by external forces and moments that occur in the operating mode are obtained. The influence of the kinematic and mass characteristics of the rotating disk is studied and expressions for calculating the dynamic reactions caused by these characteristics are obtained. Expressions for calculating th

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GOROSHKO, Аndrii, Ilona DRACH, and Vitalii TKACHUK. "INFLUENCE OF CURRENT IMBALANCES AND CENTER POSITION HARDNESS ON VIBROACTIVITY OF HORIZONTAL DRUM MACHINES." HERALD OF KHMELNYTSKYI NATIONAL UNIVERSITY 299, no. 4 (2021): 89–94. http://dx.doi.org/10.31891/2307-5732-2021-299-4-89-94.

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The issues of reducing the vibration caused by rotating rotors at the frequency of the first rotor harmonic (so-called rotor vibration) are among the most important in the design, manufacture and operation of almost all types of modern rotary machines. The washing machine as an object of study of the dynamics and reduction of vibration and noise is of particular interest due to the constant presence of randomly located and wandering imbalance of laundry in the drum and low requirements for accuracy of its manufacture and assembly of parts and assemblies. A mathematical model of oscillations of

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GOROSHKO, Аndrii, Ilona DRACH, and Vitalii TKACHUK. "INFLUENCE OF INSTANT IMBALANCE AND POSITION OF HARDNESS CENTER ON VIBROACTIVITY OF HORIZONTAL DRUM MACHINES." HERALD OF KHMELNYTSKYI NATIONAL UNIVERSITY 297, no. 3 (2021): 105–11. http://dx.doi.org/10.31891/2307-5732-2021-297-3-105-111.

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The issues of reducing the vibration caused by rotating rotors at the frequency of the first rotor harmonic (so-called rotor vibration) are among the most important in the design, manufacture and operation of almost all types of modern rotary machines. The washing machine as an object of study of the dynamics and reduction of vibration and noise is of particular interest due to the constant presence of randomly located and wandering imbalance of laundry in the drum and low requirements for accuracy of its manufacture and assembly of parts and assemblies. A mathematical model of oscillations of

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P, Thyaga Raju. "Mechanical Vibration on Rotor Balancing." INTERNATIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 09, no. 06 (2025): 1–9. https://doi.org/10.55041/ijsrem51101.

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This project investigates the principles, methodologies, and practical applications of rotor balancing, with a specific focus on the impact of unbalanced forces that lead to mechanical vibrations in rotating systems. Rotor balancing is a fundamental process in the operation and maintenance of machinery and rotating equipment. It plays a critical role in ensuring smooth operation by minimizing the vibrations caused by uneven mass distribution during rotation. Unbalanced rotors, if left uncorrected, can result in a wide range of issues such as excessive wear and tear, increased operational noise

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Katrenko, M., V. Borsch, and O. Kulyk. "Approximation of blades of radial machines with multiparameter family of smooth surfaces." Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no. 6 (December 25, 2022): 68–75. http://dx.doi.org/10.33271/nvngu/2022-6/068.

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Purpose. Development of a mathematical model for creating the spatial forms of blade devices of rotating radial dynamic blade machines. Methodology. An approach to the development of a mathematical model of blade profiling of radial dynamic blade machines, as parts of power plants, air-jet engines and fuel component supply systems of rocket engines, has been suggested. The approach is based on a physical model of the working body flow over helical surfaces. Findings. A system of equations for describing the blade of a radial dynamic blade machine of any purpose as a family of smooth surfaces h

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dos Santos, Bertolino Junio, Damásio Sacrini, Adilson Vitor Rodrigues, Geraldo Creci, and João Carlos Menezes. "Dynamic Characteristics of a 5-kN Thrust Gas Turbine Front Bearing Composed of a Vibration Absorber Element and Deep Groove Ball Bearing." Advanced Engineering Forum 47 (August 31, 2022): 43–53. http://dx.doi.org/10.4028/p-7916wb.

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Rolling bearings enable the development of high rotational speeds with a good load-bearing capacity and low frictional resistance. Therefore, rolling bearings can be used on a wide variety of rotating machines. This study investigated the dynamic stiffness and damping coefficients of the front bearing of a 5-kN thrust gas turbine. A Barden® 206(T) deep-groove ball bearing was the main part of the front bearing. Computational models were developed using MATLAB® for both the structural dynamics problem governed by Hertzian contact theory and the lubricated problem governed by elastohydrodynamic

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Globin, Andrey, Andrey Nesmiyan, Ivan Krasnov, Alexander Scherbakov, Vladimir Vanzha, and Leisan Akhtyamova. "Improving the operation process of a vane type vacuum pump for milking machines." E3S Web of Conferences 548 (2024): 01025. http://dx.doi.org/10.1051/e3sconf/202454801025.

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A description is given of the improved design of a pump with a rotating casing and flexible plates, used to create vacuum in milking machines. As a result of theoretical and experimental studies, the influence of its main parameters and operating modes on the volumetric flow was revealed. The most significant factors under consideration include: the rotation speed of the rotor and pump housing, the eccentricity of the rotor installation in the housing, the ratio of the width and diameter of the rotor, the size of the gaps at the ends. An analysis of the dynamics of air pressure in the working

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Askari, Amir R., Len Gelman, and Andrew D. Ball. "Novel Investigation of Influence of Torsional Load on Unbalance Fault Indicators for Induction Motors." Sensors 25, no. 7 (2025): 2084. https://doi.org/10.3390/s25072084.

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This paper investigates how the torsional load affects two vibration-based unbalance fault indicators. This investigation is important for unbalance fault diagnosis in multiple constant load conditions, which are unavoidable for many rotating machines. Coupled flexural–torsional dynamics of an unbalanced disc–shaft system, as the representative of an induction motor, is investigated via a continuous shaft–beam model. Numerical investigations reveal that the fundamental rotating intensity of the transversal acceleration is independent of the torsional load. So, the novel speed-invariant version

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Bayley, F. J., C. A. Long, and A. B. Turner. "Discs and Drums: The Thermo-Fluid Dynamics of Rotating Surfaces." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 207, no. 2 (1993): 73–81. http://dx.doi.org/10.1243/pime_proc_1993_207_103_02.

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This paper reviews long-term experimental and theoretical research programmes concerned with flow and heat transfer over the large rotating surfaces, commonly discs, often drums but sometimes conical, used to support the blades in turbomachinery. The account begins with a geometry found in turbomachinery from the oldest steam plant to the most modern gas turbine, in which a disc rotates near to a stationary, usually coaxial, member. The flow in the intervening ‘wheel-space’ is well understood, but external conditions can affect the extent and nature of ingress from the surrounding fluid. In th

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SZYCA, MIKOŁAJ. "ANALYSIS OF THE BMA K2400 VERTICAL CENTRIFUGE TURBINE IN TERMS OF BALANCING AND VIBRATION DIAGNOSTICS." HERALD OF KHMELNYTSKYI NATIONAL UNIVERSITY 297, no. 3 (2021): 71–80. http://dx.doi.org/10.31891/2307-5732-2021-297-3-71-80.

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Physical damage to a material is a diffuse defect in the form of vacancies, microcracks, micro-voids or damaged micro-volumes, which reduce the effective or load-bearing part of the material. Surface fatigue defects, such as deformation and cracks, occur in the bearing during the load transfer. Imbalance is a practical problem in the operation of many rotating machines, causing not only increased vibration of the machine, but also leading to accelerated wear of the rotor bearings. The subject of this work is the analysis of the dynamics of the BMA K2400 centrifuge in terms of the possibility o

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Rajendran, P., N. Jamia, S. El-Borgi, and M. I. Friswell. "Wavelet Transform-Based Damage Identification in Bladed Disks and Rotating Blades." Shock and Vibration 2018 (October 17, 2018): 1–16. http://dx.doi.org/10.1155/2018/3027980.

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Blade vibration and blade clearance are effective diagnostic features for the identification of blade damage in rotating machines. Blade tip-timing (BTT) is a noncontact method that is often used to monitor the vibration and clearance of blades in a rotating machinery. Standard signal processing of BTT measurements give one blade response sample per revolution of the machine which is often insufficient for the diagnosis of damage. This paper uses the raw data signals from the sensors directly and employs a wavelet energy-based mistuning index (WEBMI) to predict the presence and locations of da

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BRUIN, HENK, GERHARD KELLER, and MATTHIAS ST. PIERRE. "Adding machines and wild attractors." Ergodic Theory and Dynamical Systems 17, no. 6 (1997): 1267–87. http://dx.doi.org/10.1017/s0143385797086392.

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We investigate the dynamics of unimodal maps $f$ of the interval restricted to the omega limit set $X$ of the critical point for cases where $X$ is a Cantor set. In particular, many cases where $X$ is a measure attractor of $f$ are included. We give two classes of examples of such maps, both generalizing unimodal Fibonacci maps [LM, BKNS]. In all cases $f_{|X}$ is a continuous factor of a generalized odometer (an adding machine-like dynamical system), and at the same time $f_{|X}$ factors onto an irrational circle rotation. In some of the examples we obtain irrational rotations on more complic

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El-Saeidy, Fawzi M. A. "Time-Varying Total Stiffness Matrix of a Rigid Machine Spindle-Angular Contact Ball Bearings Assembly: Theory and Analytical/Experimental Verifications." Shock and Vibration 18, no. 5 (2011): 641–70. http://dx.doi.org/10.1155/2011/941027.

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A lagrangian formulation is presented for the total dynamic stiffness and damping matrices of a rigid rotor carrying noncentral rigid disk and supported on angular contact ball bearings (ACBBs). The bearing dynamic stiffness/damping marix is derived in terms of the bearing motions (displacements/rotations) and then the principal of virtual work is used to transfer it from the bearing location to the rotor mass center to obtain the total dynamic stiffness/damping matrix. The bearing analyses take into account the bearing nonlinearities, cage rotation and bearing axial preload. The coefficients

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Brahim, Sonia Ben, Samia Dardouri, Hanen Lajnef, Amel Ben Slimane, Ridha Bouallegue, and Tan-Hoa Vuong. "Evaluating Communication Performance in Rotating Electrical Machines Using RSSI Measurements and Artificial Intelligence." Sensors 24, no. 24 (2024): 8209. https://doi.org/10.3390/s24248209.

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This paper introduces a novel methodology for evaluating communication performance in rotating electric machines using Received Signal Strength Indication (RSSI) measurements coupled with artificial intelligence. The proposed approach focuses on assessing the quality of wireless signals in the complex, dynamic environment inside these machines, where factors like reflections, metallic surfaces, and rotational movements can significantly impact communication. RSSI is used as a key parameter to monitor real-time signal behavior, enabling a detailed analysis of communication reliability. The meth

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