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Artykuły w czasopismach na temat „SPINNING SHAFT”

Autor: Grafiati

Data publikacji: 11 września 2023

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1

Gayen, Debabrata, i Tarapada Roy. "Finite element based vibration analysis of functionally graded spinning shaft system". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 228, nr 18 (20.03.2014): 3306–21. http://dx.doi.org/10.1177/0954406214527923.

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The present work deals with the study of vibration and stability analysis of a functionally graded spinning shaft system using three-noded beam element based on the Timoshenko beam theory. Material properties are assumed to be graded in radial direction according to power law gradation. In the present analysis, the mixture of aluminum oxide (Al2O3) and stainless steel (SUS304) has been considered as functionally graded material where metal (SUS304) content decreases towards the outer diameter of the shaft. The functionally graded shafts has been modeled as a Timoshenko beam, which contains discrete isotropic rigid disks supported by flexible bearing. The functionally graded shaft has been modeled based on first-order shear deformation beam theory with transverse shear deformation, rotary inertia, gyroscopic effect, strain and kinetic energy of shafts by adopting three-dimensional constitutive relations. The derivation of governing equations of motion has been obtained using Hamilton’s principle. Three-noded beam element with four degrees of freedom per node has been used to solve the govering equations. In this work, the effects of both internal viscous and hysteretic damping have also been incorporated in the finite element model. Various results have been obtained such as Campbell diagram, stability speed limit, damping ratio, and time responses for functionally graded shaft and also compared with conventional steel shaft. It has been found that the responses of the functionally graded spinning shaft are significantly influenced by material properties, radial thickness, power law gradient index, and internal (viscous and hysteretic) damping. The obtained results also show the advantages of functionally graded shaft over conventional steel shaft.

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2

Chang, Min-Yung, Jeng-Keag Chen i Chih-Yung Chang. "A simple spinning laminated composite shaft model". International Journal of Solids and Structures 41, nr 3-4 (luty 2004): 637–62. http://dx.doi.org/10.1016/j.ijsolstr.2003.09.043.

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3

Sturla, F. A., i A. Argento. "Free and Forced Vibrations of a Spinning Viscoelastic Beam". Journal of Vibration and Acoustics 118, nr 3 (1.07.1996): 463–68. http://dx.doi.org/10.1115/1.2888206.

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The free and forced response of spinning, viscoelastic, Rayleigh shafts is studied. Viscoelasticity is included using the three parameter solid model. The closed form polynomial frequency equation and integral expressions for the response to a general forcing function are derived. A convenient decay parameter is described. Results are given for natural frequencies and decay rates as functions of shaft rotation speed, stiffness, and viscosity. It is found that shaft materials are possible which have desirable damping and natural frequency characteristics. A parameter case is discussed in which natural frequency and damping simultaneous increase, while stiffness is held constant. Also, the special case of forced response to a step load is derived and used to illustrate the combined effects of viscoelasticity and gyroscopic forces.

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4

Botros, K. K. "Transient Phenomena in Compressor Stations During Surge". Journal of Engineering for Gas Turbines and Power 116, nr 1 (1.01.1994): 133–42. http://dx.doi.org/10.1115/1.2906782.

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Transient phenomena are generally inherent in the operation of compressor stations: These are either fast or slow transients. A model describing the governing equation for the gas dynamics, control system, compressor and turbine shaft inertias has been developed. The effect of these inertias is manifested by an example of a compressor station operating near the surge control line. Another example deals with a station that has a cooler placed in the recycle path. This alters the rate at which the compressor shaft decelerates upon shutdown and may cause backward spinning depending on the relative magnitude of the shaft inertia with respect to the cooler volume. Backward spinning of compressor shaft has detrimental effects on dry seals and is undesirable. It was found that by keeping the recycle valve closed upon shutdown, the rate of shaft deceleration will be reduced.

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5

Salam, Abdul, Muh Iswar, Bensar Pali, Agustinus Anggai i Janchristo Rantemangnga. "Modifikasi Alat Pemintal Benang Sutera Untuk Industri Rumah Tangga". Jurnal Sinergi Jurusan Teknik Mesin 17, nr 1 (5.05.2019): 101. http://dx.doi.org/10.31963/sinergi.v17i1.1599.

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This study aims to determine the yarn spinning time, spinning equipment manufacturing costs, and haspel shaft spinning. Basic design is done by data collection, direct visits to the silk farmers' groups, tool design, tool manufacturing, performance testing tools, analysis, calculating costs and tool manufacturing. In accordance with the testing of the spinning machine, the total working time is 8 hours / day for 3.36 kg of silk yarn, the spinning equipment manufacturing cost is Rp. 5,102,534.71. Whereas BEP is achieved when the sale of spinning machines is at least 1 unit / month or when income is Rp. 5,621,064.

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6

Wong, E., i J. W. Zu. "Dynamic Response of a Coupled Spinning Timoshenko Shaft System". Journal of Vibration and Acoustics 121, nr 1 (1.01.1999): 110–13. http://dx.doi.org/10.1115/1.2893936.

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The dynamic behavior of a simply-supported spinning Timoshenko shaft with coupled bending and torsion is analyzed. This is accomplished by transforming the set of nonlinear partial differential equations of motion into a set of linear ordinary differential equations. This set of ordinary differential equations is a time-varying system and the solution is obtained analytically in terms of Chebyshev series. A beating phenomoenon is observed from the numerical simulations, which is not observed for shaft systems where only bending vibration is considered.

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7

Mario Sariski Dwi Ellianto, Yusuf Eko Nurcahyo i Fajrul Fikri Al Firdausi. "Empowerment of Fishermen Communities through the Utilization of Spinning Machine Technology in Weru Village, Paciran District". Soeropati 4, nr 2 (30.05.2022): 142–50. http://dx.doi.org/10.35891/js.v4i2.3302.

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The problem faced by the Slap Strap Making Business Group is that the process of making slap ropes is still manual using a hand drill. This business group experienced many problems when using manual methods, such as the results of the twisting of the slapping rope were not uniform and many were loose. The second obstacle faced is that manual labor requires a lot of manpower for the slap rope spinning process. The last obstacle faced is when using a spinning machine there is a concern that the electricity supply will not be able to meet because the electricity supply in the area around the coast still uses 450 watts of electricity. So that if you use a spinning machine, it is hoped that the machine can be energy efficient and easy to use. The right solution is offered to solve the problem of the need for a spinning machine that is energy efficient and easy to use, namely the manufacture of a slap rope spinning machine with a chain shaft system. The machine includes various components, among others; frames, shafts, bearings, gears, dimmers, belts and pulleys. The propulsion system uses an electric motor. By using the slap rope spinning machine, it is be able to increase the efficiency and effectiveness of the slap rope spinning process.

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8

Yadao, Adik Ramdayal, Ravi P. Singh i D. R. Parhi. "Influence of Parameters of Cracked Rotor System on its Vibration Characteristics in Viscous Medium at Finite Region". Applied Mechanics and Materials 592-594 (lipiec 2014): 2061–65. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.2061.

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The paper summarizes a complete analysis about vibrational characteristics of a spinning simply supported cracked shaft with fluid medium at finite region. The damping effect occurs due to external fluid is integrated in the existing analysis, with the help of navier - stokes equation. The simply supported cracked shaft is analyzed by the influence coefficient strain energy method. Here we have changing the parameter of shaft i.e. damping viscosity of fluid and the length of the shaft which accountable for the alteration of the amplitude of vibration.

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9

Lee, Usik, In Joon Jang i Il Wook Park. "Frequency-Domain Spectral Element Model of a Uniform Spinning Shaft". Applied Mechanics and Materials 224 (listopad 2012): 264–67. http://dx.doi.org/10.4028/www.scientific.net/amm.224.264.

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This paper presents a spectral element model for the spinning uniform shaft represented by the Timoshenko beam model. The bearing-supports are represented by equivalent springs. The variational approach is used to formulate the spectral element model from the frequency-dependent shape functions derived from exact wave solutions to the governing differential equations.

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10

Boukhalfa, Abdelkrim. "Campbell Diagrams of a Spinning Composite Shaft with Curvilinear Fibers". Latin American Journal of Solids and Structures 14, nr 4 (marzec 2017): 575–93. http://dx.doi.org/10.1590/1679-78253326.

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11

Dasgupta, S. S., A. K. Samantaray i R. Bhattacharyya. "Stability of an internally damped non-ideal flexible spinning shaft". International Journal of Non-Linear Mechanics 45, nr 3 (kwiecień 2010): 286–93. http://dx.doi.org/10.1016/j.ijnonlinmec.2009.12.002.

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12

Shahgholi, Majid, Siamak Esmaeilzadeh Khadem i Saeed Bab. "Nonlinear vibration analysis of a spinning shaft with multi-disks". Meccanica 50, nr 9 (26.03.2015): 2293–307. http://dx.doi.org/10.1007/s11012-015-0154-8.

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13

Adekunle, Atta, i Owolarafe Oseni. "Development and Performance Evaluation of a Small Scale Kenaf Fibre Spinning and Reeling Machine". Agricultural Engineering 27, nr 1 (1.01.2023): 163–72. http://dx.doi.org/10.2478/agriceng-2023-0012.

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Abstract A developed small scale kenaf spinning and reeling machine was evaluated in this study. The machine uses the principle of the ring spinning technique to produce spun kenaf-yarn (single or double-ply). The machine component includes two 0.5 kW electric motors positioned on a 640×433×10 mm mild steel frame (with speeds of the electric motors controlled by 0.5 kW variable frequency drives), twisting spindle, inlet frustum, feed roller shaft, reeling and spinning shafts, bearings, and a bevel gear. The machine was evaluated using different spinning speeds (90, 100 and 110 rpm), reeling speeds (60, 70 and 80 rpm) and a kenaf sample (Ifeken DI 400). At the spinning and reeling speeds combination of 90 and 80 rev·min−1, the developed machine was able to produce a continuous length of kenaf yarn twisted at 95.5 turns per minute with a production speed of 0.94 m·min−1 at the highest efficiency (88.9%) of the machine. The level of twist of the spun yarn spun provides information on the required twist level for kenaf fibre as deviation from this value was discovered to cause deformation on the spun yarn. This machine was able to reduce the drudgery involved in the production of spun kenaf-yarn and the technology is expected to positively influence kenaf’s growth and utilization in Nigeria.

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14

Yang, Shih-Ming. "Vibration of a Spinning Annular Disk With Coupled Rigid-Body Motion". Journal of Vibration and Acoustics 115, nr 2 (1.04.1993): 159–64. http://dx.doi.org/10.1115/1.2930326.

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The vibration of a spinning annular disk with coupled translational and rotational rigid-body motion is analyzed. The spinning disk, with one linear spring as transverse load, is free to translate and rotate relative to the shaft axis. Modal functions of a stationary annular disk are used to describe the elastic displacement of the spinning disk. The governing equation includes the rigid disk translation, rotation, and the flexible disk vibration. Coupling effects between the rigid-body motion and the annular disk modal function are identified in the formulation. Because of the coupling effects, stable operation beyond divergence (critical speed) is achieved, the disk loses its stability to flutter. This stability prediction is different from that of a spinning disk without rigid-body motion where the disk is unstable at and right after divergence.

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15

Dasgupta, Sovan, i John Rajan. "Steady-state and transient responses of a flexible eccentric spinning shaft". FME Transaction 46, nr 1 (2018): 133–37. http://dx.doi.org/10.5937/fmet1801133d.

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16

Shahgholi, Majid, i Siamak Esmaeilzadeh Khadem. "Resonances of an in-extensional asymmetrical spinning shaft with speed fluctuations". Meccanica 48, nr 1 (16.08.2012): 103–20. http://dx.doi.org/10.1007/s11012-012-9587-5.

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17

Georgiades, Fotios. "Nonlinear dynamics of a spinning shaft with non-constant rotating speed". Nonlinear Dynamics 93, nr 1 (5.11.2017): 89–118. http://dx.doi.org/10.1007/s11071-017-3888-0.

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18

Lee, Usik, i Injoon Jang. "Spectral element model for the vibration of a spinning Timoshenko shaft". Journal of Mechanics of Materials and Structures 7, nr 2 (6.05.2012): 145–64. http://dx.doi.org/10.2140/jomms.2012.7.145.

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19

WANG, Z. C., i W. L. CLEGHORN. "STABILITY ANALYSIS OF SPINNING STEPPED-SHAFT WORKPIECES IN A TURNING PROCESS". Journal of Sound and Vibration 250, nr 2 (luty 2002): 356–67. http://dx.doi.org/10.1006/jsvi.2001.3725.

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20

Mustapha, K. B., Z. W. Zhong i S. B. A. Kashem. "Vibration Behavior of Gravity-Loaded Whirling Micro-Scale Shafts Influenced by an Axial Magnetic Field". International Journal of Structural Stability and Dynamics 17, nr 09 (23.10.2017): 1750110. http://dx.doi.org/10.1142/s0219455417501103.

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Some high-speed rotating micro-machines and micro-vibration devices rely on the use of whirling micro-shafts subject to the effect of gravity and magnetic fields. At present, the consequences of the interaction between the elastic deformation of such shafts and the magnetic/gravitational field effects remain unresolved. Focusing on micro-scale whirling shafts with very high torsional rigidity, this study presents a theoretical treatment grounded in the theory of micro-continuum elasticity to examine the ramification of this interaction. The differential transformation method (DTM) is used to obtain extensive numerical results for qualitative assessments of the magnetic-gravitational effects interaction on standing, hanging and horizontally positioned spinning micro-scale shafts. The influence of bearing-support flexibility on the response of the whirling micro-shaft is also considered with rotational and translational springs. The gravitational sag reduces the stability of whirling standing micro-shafts and increases that of the hanging micro-shafts. Further, for all the micro-shafts configurations investigated, the magnetic field is observed to stiffen the response of the shaft and favorably shifts the critical points of vibration of the whirling shafts forward.

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21

Timofievskiy, A. A. "Problems of process control for shifting gears on tractors without torque interruption". Izvestiya MGTU MAMI 10, nr 3 (15.09.2016): 32–42. http://dx.doi.org/10.17816/2074-0530-66905.

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The article considers the problem of optimizing the process control for shifting gears on tractors without torque interruption. The opinion on the dynamics of process control for shifting gears is explained, it takes into account the occurrence of torque deficit in the shafts, when changing gear, and increasing of friction losses in spinning clutch. The formulas for calculating the dynamic parameters used in the mathematical model of the dynamics of the tractor when shifting gears without torque interruption are shown. With the help of the mathematical model developed in Scientific and Research Tractor Institute (NATI) for debugging the system of electro-hydraulic control of gear shifting process for CHN-6 tractor were calculated several variants of gear shifting. Particular attention is given to occurrence, development and completion of the power circulation process in the circuit of switched clutches, because the lack of circulation of power the majority of authors call the basis of optimal switching. The results of the calculations in terms of the circulation of power, failure to slipping of switching off the clutch and interlocking of switched on clutch are shown. Calculation results suggest that when the clutch of lowest gear is closed the torque growth in spinning clutch of switched on top gear causes an increase in friction losses of disks, which leads to a decrease in engine shaft speed and reduction of the tractor speed. The magnitude and duration of fall of the engine speed and the speed of the tractor are low, but due to a decrease in the speed of the tractor the moments of forces inertia are large enough and need to be taken into account in the calculations. In all experiments, where power circulation was present, it started earlier than top gear clutch created torque, which corresponds to the resistance movement. In all experiments, where power circulation was present, it ended as a result of reducing the pressure in the clutch booster of lower gear after its failure to spinning in the power circulation mode. The circulating power after the failure to spinning and clutch switching off is redirected to output shaft accelerating the tractor and accelerating the synchronization and interlocking of switched on clutch.

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22

Li, Wei, Zhiwei Song, Xuexia Gao i Zhigang Chen. "Dynamic Instability Analysis of a Rotating Ship Shaft under a Periodic Axial Force by Discrete Singular Convolution". Shock and Vibration 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/482607.

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Dynamic instability of a rotating ship shaft subjected to a periodic axial force is studied by using discrete singular convolution (DSC) with regularized Shannon’s delta kernel. The excitation frequency is related to the spinning speed and the number of blades on the propeller. Effects of number of blades, constant term in the periodic force, and damping on dynamic instability regions are investigated. The results have shown that the increase of number of blades and damping could improve the dynamic stability of rotating shaft with damping. The increase of constant term in the periodic force leads to dynamic instability regions shifting to lower frequencies, making the shaft more sensitive to periodic force. Those dynamic instability regions obtained by DSC method have been compared with those by Floquet’s method to verify the application of DSC method to dynamic instability analysis of rotating ship shaft.

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23

Dasgupta, Sovan Sundar, i Vasudevan Rajamohan. "Dynamic characterization of a flexible internally damped spinning shaft with constant eccentricity". Archive of Applied Mechanics 87, nr 10 (28.07.2017): 1769–79. http://dx.doi.org/10.1007/s00419-017-1285-2.

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24

Chan, K. T., N. G. Stephen i S. R. Reid. "Helical structure of the waves propagating in a spinning Timoshenko beam". Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 461, nr 2064 (4.10.2005): 3913–34. http://dx.doi.org/10.1098/rspa.2005.1524.

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The aim of the paper is to study the cause of a frequency-splitting phenomenon that occurs in a spinning Timoshenko beam. The associated changes in the structure of the progressive waves are investigated to shed light on the relationship between the wave motion in a spinning beam and the whirling of a shaft. The main result is that travelling bending waves in a beam spinning about its central axis have the topological structure of a revolving helix traced by the centroidal axis with right-handed or left-handed chirality. Each beam element behaves like a gyroscopic disc in precession being rotated at the wave frequency with anticlockwise or clockwise helicity. The gyroscopic effect is identified as the cause of the frequency splitting and is shown to induce a coupling between two interacting travelling waves lying in mutually orthogonal planes. Two revolving waves travelling in the same direction in space appear, one at a higher and one at a lower frequency compared with the pre-split frequency value. With reference to a given spinning speed, taken as clockwise, the higher one revolves clockwise and the lower one has anticlockwise helicity, each wave being represented by a characteristic four-component vector wavefunction. Two factors are identified as important, the shear-deformation factor q and the gyroscopic-coupling phase factor θ . The q -factor is related to the wavenumber and the geometric shape of the helical wave. The θ -factor is related to the wave helicity and has two values, + π /2 and − π /2 corresponding to the anticlockwise and clockwise helicity, respectively. The frequency-splitting phenomenon is addressed by analogy with other physical phenomena such as the Jeffcott whirling shaft and the property of the local energy equality of a travelling wave. The relationship between Euler's formula and the present result relating to the helical properties of the waves is also explored.

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25

Ghosh, R., A. Saha, A. Nandi i S. Neogy. "Stability Analysis of a Flexible Spinning and Precessing Rotor with Non-symmetric Shaft". Journal of Vibration and Control 16, nr 1 (20.10.2009): 107–25. http://dx.doi.org/10.1177/1077546309106522.

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26

Zhu, Huai-liang. "Transient responses of flexible non-uniform spinning shaft with nonlinear and asymmetric supports". Journal of Shanghai University (English Edition) 5, nr 1 (marzec 2001): 35–39. http://dx.doi.org/10.1007/s11741-001-0024-6.

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27

Pettigrew, Devin B., John C. Whittaker, Justin Garnett i Patrick Hashman. "How Atlatl Darts Behave: Beveled Points and the Relevance of Controlled Experiments". American Antiquity 80, nr 3 (lipiec 2015): 590–601. http://dx.doi.org/10.7183/0002-7316.80.3.590.

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Beveled retouch on stone projectile points has often been considered as a device to spin and stabilize a projectile. A recent paper showed that a beveled point will spin a small shaft under tightly controlled laboratory conditions. However, this experiment has little relevance for real projectiles such as atlatl darts, which flex dramatically and spin unevenly inflight, quite independent of point form. The spinning is related to the flexibility of the dart, which is necessary for spearthrower functión. A beveled point cannot spin a dart in the air, but is likely to cause some rotation when encountering a solid target like flesh. Beveled points are probably not related to spinning either darts or arrows inflight and present a good example of why we need to have both theoretical understanding and experimental observations of details of projectile behavior before interpreting artifacts. Spinning in a carcass could make beveled points more lethal, but the suggestion that beveling mostly results from sharpening and other modification of stone points remains the best explanation.

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28

Chen, L. W., i H. C. Sheu. "THE STABILITY BEHAVIOR OF A NON-CONSERVATIVE SPINNING TIMOSHENKO SHAFT WITH AN OVERHUNG DISK". Journal of Sound and Vibration 200, nr 1 (luty 1997): 41–61. http://dx.doi.org/10.1006/jsvi.1996.0719.

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29

Qian, Xin, Guo Chang Lin i Xing Wen Du. "Vibration Measurement and Data Analysis of a Spinning Shaft Using a Camera-Based Motion Analysis System". Applied Mechanics and Materials 29-32 (sierpień 2010): 203–8. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.203.

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This paper presents the use of a camera-based 3D motion analysis system for non-contact dynamic testing of a highly flexible spinning vertical shaft. The camera system uses high-resolution CMOS cameras to measure instant geometry of the shaft when visible red digital LED strobes are synchronized to work at a speed between 0.1 to 2000 frames per second. Dynamically deformed geometries are obtained by tracing the three-dimensional instantaneous coordinates of markers adhered to the shaft’s outside surface and triangulation techniques for identifying markers’ coordinates. Numerical simulation and experimental results show that the use of camera-based motion analysis systems is feasible and accurate enough for dynamic experiments. For dynamics characterization, we present the use of the Hilbert-Huang transform (HHT) for time frequency analysis of measured dynamic responses. The results show that the third-mode vibration has a cubic nonlinearity.

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30

Miao, Qiang, i Qinghua Zhou. "Planetary Gearbox Vibration Signal Characteristics Analysis and Fault Diagnosis". Shock and Vibration 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/126489.

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Planetary gearboxes are widely used in helicopters, wind turbines, mining machinery, and so forth. The structure and motion type of a planetary gearbox are more complex in comparison with a fixed-shaft one, which makes condition monitoring and fault diagnosis of planetary gearbox a challenging issue in practical applications. In order to understand the fundamental nature of planetary gearbox vibration, this paper conducts an investigation on vibration characteristics of a single-stage planetary gearbox. Assuming that the gearbox and the sensor revolve inversely at the speed of planet carrier, the problem can be transformed into two easier parts: research on fixed-shaft gearbox signal model and research on influence of sensor spinning. Based on this assumption, a vibration signal model of planetary gearbox is obtained. Experimental data are used to validate the model.

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31

Kandouci, Ch. "Whirling Analysis of Stepped Timoshenko Shaft Carrying Several Rigid Disks". Journal of Mechanical Engineering 19, nr 2 (15.04.2022): 97–124. http://dx.doi.org/10.24191/jmeche.v19i2.19767.

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Rotor system is the main part of turbomachines. Critical speeds occur when the rotor spin-speed matches with its natural frequencies, and result in great vibration amplitudes often leading to catastrophic failure. Design specifications based on these critical speeds become essential for the engineer. In this paper, whirling vibrations of a spinning, stepped Timoshenko shaft carrying three identical rigid disks are solved using a developed program in Fortran 90 language, based on relationships between the solution coefficient vectors of differential equations of motion. The flexural vibrations are considered in two orthogonal planes. Shear deformation, rotary inertia, and gyroscopic moments are taken into account. This study shows that in the case of the Timoshenko model, the relationship matrix form between the aforementioned vectors presents an advantage, that reduces the number of multiplied matrices when adjacent shaft segments have the same mechanical and geometric properties. The presented approach and Natanson's technique are combined to determine the whirling mode shapes. The accuracy of the presented technique is confirmed by comparing the obtained results with those available in the literature.

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32

Ganguly, Smitadhi, A. Nandi i S. Neogy. "A viscoelastic Timoshenko shaft finite element for dynamic analysis of rotors". Journal of Vibration and Control 24, nr 11 (29.11.2016): 2180–200. http://dx.doi.org/10.1177/1077546316681685.

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A new shaft element is proposed for viscoelastic rotors in a spinning frame considering the shear deformation in addition to bending deformation. The Maxwell–Wiechert model is considered here to replicate linear viscoelastic behavior. This model considers additional internal damping displacement variables between elastic and viscous elements and the stress depends not only on the elastic strain and elastic strain rate, but also on additional strains and their rates corresponding to the damping variables. The present work assumes that these additional strains can be derived from continuous fictitious displacement variables, which in turn are interpolated from their nodal values using the Timoshenko beam shape functions. Therefore, in addition to the standard degrees of freedom for a three-dimensional shaft, extra degrees of freedom are defined at the nodes. The finite element matrices are assembled in state space. The time domain equations are then used for stability analysis and computation of response to a unit step load and an unbalance.

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33

Wen, Zhuqing, i Jerzy Petera. "CFD Numerical Simulation of Biodiesel Synthesis in a Spinning Disc Reactor". Chemical and Process Engineering 36, nr 1 (1.03.2015): 21–37. http://dx.doi.org/10.1515/cpe-2015-0002.

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Abstract In this paper a two-disc spinning disc reactor for intensified biodiesel synthesis is described and numerically simulated. The reactor consists of two flat discs, located coaxially and parallel to each other with a gap of 0.2 mm between the discs. The upper disc is located on a rotating shaft while the lower disc is stationary. The feed liquids, triglycerides (TG) and methanol are introduced coaxially along the centre line of rotating disc and stationary disc. Fluid hydrodynamics in the reactor for synthesis of biodiesel from TG and methanol in the presence of a sodium hydroxide catalyst are simulated, using convection-diffusion-reaction species transport model by the CFD software ANSYS©Fluent v. 13.0. The effect of the upper disc’s spinning speed is evaluated. The results show that the rotational speed increase causes an increase of TG conversion despite the fact that the residence time decreases. Compared to data obtained from adequate experiments, the model shows a satisfactory agreement.

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Dong, Zhen, i Zhi Rong Ding. "Manufacture of Hollow Cross Sectional Regenerated Cellulose Fiber Using HWM Spinning Method". Advanced Materials Research 472-475 (luty 2012): 744–47. http://dx.doi.org/10.4028/www.scientific.net/amr.472-475.744.

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Traditional regenerated cellulose fiber (viscose or viscose fiber) had a poor wet breaking strength and wet modulus, which to some extent limited the application of the fiber. Hollow viscose was difficult to get for its instability during the cellulose regenerating process. This paper introduced one kind of new spinning method for hollow viscose through a spinneret of concentric shaft structure using HWM technology. The hollow viscose fiber produced in this experiment had a big crystalline structure and an excellent fibril orientation which gifted the fiber a good mechanical performance even under wet circumstances. The fiber had a bright future in textile application as one component of blending fabrics.

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Na, Sungsoo, Hyungwon Yoon i Liviu Librescu. "Effect of taper ratio on vibration and stability of a composite thin-walled spinning shaft". Thin-Walled Structures 44, nr 3 (marzec 2006): 362–71. http://dx.doi.org/10.1016/j.tws.2006.02.007.

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Jia, H. S. "ON THE BENDING COUPLED NATURAL FREQUENCIES OF A SPINNING, MULTISPAN TIMOSHENKO SHAFT CARRYING ELASTIC DISKS". Journal of Sound and Vibration 221, nr 4 (kwiecień 1999): 623–49. http://dx.doi.org/10.1006/jsvi.1998.2032.

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BORZEA, Claudia, Adrian SAVESCU, Iulian VLADUCA i Adrian STOICESCU. "ASYNCHRONOUS THREE-PHASE MACHINE DRIVEN AS GENERATOR BY A TWIN-SCREW EXPANDER". "ACTUALITĂŢI ŞI PERSPECTIVE ÎN DOMENIUL MAŞINILOR ELECTRICE (ELECTRIC MACHINES, MATERIALS AND DRIVES - PRESENT AND TRENDS)" 2020, nr 1 (10.02.2021): 1–8. http://dx.doi.org/10.36801/apme.2020.1.5.

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The paper presents the functioning regimes of a 132 kW asynchronous three-phase machine, used for the expander-generator system in a compressed air energy storage facility. The installation consists of a 110 kW twin-screw electro-compressor, which supplies pressurized air up to ~16 bar into a 50 cubic meters storage vessel. The compressed air is afterwards released from the reservoir into expander’s inlet, spinning its shaft. When the expander’s shaft spins the electric machine over its synchronous speed, this one enters in generator mode, supplying electric power into the grid. Two power analysers installed on the automation control cabinet monitor the generated/absorbed power and the power supplied/consumed by the system from the grid. Using the data acquired by means of PLC during commissioning tests, we plotted the power curves, differential pressure and significant temperatures, as well as the electric machine’s speed.

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Rudovsky, P. N. "FORMATION OF PACKAGES WITH PERIODIC CHANGE OF FORCES OF PRESSURE OF THE DRUM TO WINDING SHAFT". Technologies & Quality, nr 4 (2019): 20–24. http://dx.doi.org/10.34216/2587-6147-2019-4-46-20-24.

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For the formation of high-quality packaging of cross winding on machines with a constant speed, release into the composition of the winding mechanism introduce a dispersion device of the bundle winding, providing a change in the speed of the yarn guide according to the law with a long cycle of work. When laying the thread with a slotted drum, as on a spinning self-rolling machine PSK-225 SH there is no way to influence the movement of the yarn guide. In this case, effective dispersion can be achieved by periodically changing the clamping force of the bobbin to the winding shaft. When the effort of pressing the bobbin to the winding shaft changes, the contact radius of the bobbin changes, and hence its rotation frequency, which in turn leads to a change in the angle of elevation of the coil. A mathematical model is obtained that describes the change in the angle of the coil on the package from the effort of pressing the bobbin to the winding shaft. It is shown that such a device can effectively eliminate defects in the structure of the winding in the form of bundles and ribbons.

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Akyuz, U. "Separation at the interface of non-linearly elastic spinning tube–rigid shaft subjected to circumferential shear". International Journal of Non-Linear Mechanics 39, nr 8 (październik 2004): 1333–41. http://dx.doi.org/10.1016/j.ijnonlinmec.2003.09.003.

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Cuttino, J. F., T. A. Dow i B. F. Knight. "Analytical and Experimental Identification of Nonlinearities in a Single-Nut, Preloaded Ball Screw". Journal of Mechanical Design 119, nr 1 (1.03.1997): 15–19. http://dx.doi.org/10.1115/1.2828782.

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The nonlinear performance of a single-nut, preloaded ball screw actuator is analyzed in this paper. The study identifies the source of nonlinear torque in the ball screw and subsequently maps that torque into the nonlinear displacement response due to windup in the shaft. The study is complemented with an experimental verification using a small angle rotation fixture (ARC) to input very small amplitude angular displacements to the screw while measuring induced torque and displacements. The experimental results are obtained from a Precision Linear Optimization Testbed (PLOT) which was developed to study the ability of different actuator systems to provide long range motion with nanometer accuracy. The analysis is conducted for the case of no axial loading. The study shows that the nonlinearities in the ball screw originate in the rolling friction between the balls and the races which induces torque in the nut and subsequently windup in the shaft. It also shows that the torque can be deduced from a relationship of the torque between a ball spinning in a race.

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Jianliang, Guo, i Han Rongdi. "Simulating the Diameter Error Due to the Dynamic Response of a Spinning Slender Shaft in Turning Operation". SIMULATION 82, nr 4 (kwiecień 2006): 227–33. http://dx.doi.org/10.1177/0037549706067647.

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Liu, J., Y. B. Liu, X. M. Jiang, X. Luo i M. Zeng. "Design and research of supplying power for spinning emitter in needleless electrospinning with non-metallic rotating shaft". Journal of Physics: Conference Series 1209 (kwiecień 2019): 012002. http://dx.doi.org/10.1088/1742-6596/1209/1/012002.

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Monajemi, A. A., i M. Mohammadimehr. "Effects of residual stress and viscous and hysteretic dampings on the stability of a spinning micro-shaft". Applied Mathematics and Mechanics 41, nr 8 (16.07.2020): 1251–68. http://dx.doi.org/10.1007/s10483-020-2640-8.

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Mu, Shi Gang, i Xian Ying Feng. "Analysis of Elastohydrodynamic Lubrication of Ball Screw with Rotating Nut". Applied Mechanics and Materials 121-126 (październik 2011): 3132–39. http://dx.doi.org/10.4028/www.scientific.net/amm.121-126.3132.

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The isothermal elliptical contact elastohydrodynamic lubrication (EHL) problem in ball screw with rotating nut was studied.Numerical solution to the problem was obtained for various parameters with a multigrid solver.Based on work mentioned above,the influence of the working parameters such as the rotating speed of screw shaft and the contact force,on the lubricant oil film thickness and pressure is analyzed .The results showed that, with the increasing loads,the pressure became higher,the film thickness became smaller. On the other hand,when the angular velocity was higher,the film thickness was higher, while the pressure spike was closer to the center of the contact. Because of the spinning, the slide-roll ratio was not a constant.

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Rodika, Rodika, Tuparjono Tuparjono, Budi Otomo i Riska Ade Febryani. "Rancangan Mesin Pembelah Buah Pinang Dengan Dua Mata Potong". Manutech : Jurnal Teknologi Manufaktur 10, nr 02 (20.05.2019): 59–63. http://dx.doi.org/10.33504/manutech.v10i02.72.

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Betel nut palm plant is one of the many benefits and efficacy, especially seeds. Areca nuts are widely used as the main raw material in the process of making drugs, cosmetics, slimming, snacks, sweets, and coffee. Betel nut processing into betel nut is still constrained by the tool is still modest, are still using wood beams repose knife to split betel nut into two parts. To overcome these problems needed betel nut splitter machine with a capacity of 250 kg / h. This engine design is expected to help farmers during the process of betel nut processing into dried betel nut. The working principle of betel nut splitter machine originated from an electric motor that produces rotation is forwarded to the reducer and to the cutting blade associated with two gears. Betel nut is inserted through the insertion funnel towards the rotor has 4 channels / trench, and rotor spinning and crashing betel nut rotating blades reversed so the rotor besidesbetel nut split into two parts. Shaft rotation speed at the eye-piece and carrier rotor shaft is 9.32 rpm, the rotation speed is obtained from the ratio gearbox and pulley on the engine splitter ratio. With the machine is expected to help farmers to cultivate betel nut, so the work is lighter, faster and may prevent accidents. Shaft rotation speed at the eye-piece and carrier rotor shaft is 9.32 rpm, the rotation speed is obtained from the ratio gearbox and pulley on the engine splitter ratio. With the machine is expected to help farmers to cultivate betel nut, so the work is lighter, faster and may prevent accidents. Shaft rotation speed at the eye-piece and carrier rotor shaft is 9.32 rpm, the rotation speed is obtained from the ratio gearbox and pulley on the engine splitter ratio. With the machine is expected to help farmers to cultivate betel nut, so the work is lighter, faster and may prevent accidents.

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Vranas, Miles, i Nikos J. Mourtos. "Compact Shaft-Rotating Swerve Drive with Prong Structure for Highly-Maneuverable and Agile Robots". Athens Journal of Τechnology & Engineering 9, nr 1 (17.02.2022): 25–42. http://dx.doi.org/10.30958/ajte.9-1-2.

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Robots are becoming increasingly important in our lives. Although many robots are stationary, for example robotic arms, moving robots are of particular interest for many applications. Applications of moving robots today include combating COVID-19 in hospitals, transporting goods in and across warehouses and distribution centers, and moving equipment and instrumentation in space, to name a few. Mobile robots are often required to maneuver rapidly in tight spaces. The best way to achieve this is through a modular assembly called Swerve Drive, which is a driven wheel that can pivot 360 degrees. Three or more modules can be placed at the corners of the robot, allowing high levels of maneuverability, such as, for example, spinning while following a path in any direction. This paper presents the design of a swerve drive module, which improves the current state-of-the-art. The proposed Swerve Drive module has similar properties to current designs available in the market in four out of six metrics defined in this work, while it does significantly better in the other two metrics. Keywords: robotics, mechanical engineering, drivetrain, maneuverability, mobile, swerve-drive

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Wen, Zhuqing, i Jerzy Petera. "Numerical Analysis of The Effect of Hydrodynamics and Operating Conditions on Biodiesel Synthesis in a Rotor-Stator Spinning Disk Reactor". Chemical and Process Engineering 38, nr 2 (27.06.2017): 265–81. http://dx.doi.org/10.1515/cpe-2017-0020.

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AbstractA rotor-stator spinning disk reactor for intensified biodiesel synthesis is described and numerically simulated in the present research. The reactor consists of two flat disks, located coaxially and parallel to each other with a gap ranging from 0.1 mm to 0.2 mm between the disks. The upper disk is located on a rotating shaft while the lower disk is stationary. The feed liquids, triglycerides (TG) and methanol are injected into the reactor from centres of rotating disk and stationary disk, respectively. Fluid hydrodynamics in the reactor for synthesis of biodiesel from TG and methanol in the presence of a sodium hydroxide catalyst are simulated, using convection-diffusion-reaction multicomponent transport model with the CFD software ANSYS©Fluent v. 13.0. Effect of operating conditions on TG conversion is particularly investigated. Simulation results indicate that there is occurrence of back flow close to the stator at the outlet zone. Small gap size and fast rotational speed generally help to intensify mixing among reagents, and consequently enhance TG conversion. However, increasing rotational speed of spinning disk leads to more backflow, which decreases TG conversion. Large flow rate of TG at inlet is not recommended as well because of the short mean residence time of reactants inside the reactor.

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Pratomo, H., A. N. Ichniarsyah i T. P. Purboningtyas. "Design of ‘ready-to-pack’ deep frying machine". IOP Conference Series: Earth and Environmental Science 1038, nr 1 (1.06.2022): 012056. http://dx.doi.org/10.1088/1755-1315/1038/1/012056.

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Abstract Food processing by applying high temperatures can eliminate most microbes and inactivate enzymes that can cause spoilage. Food processing tools and machines have an important role to provide better quality results and carried out more efficiently and effectively. This study aimed to obtain and analyze data also to create design documentation for a ‘readyto-pack’ deep frying machine. Data were collected by means of observation, interviews, and documentations. Data analysis was carried out by processing the collected data with mathematical calculations. The design documentation process was done using Solidworkss software. This ‘ready-to-pack’ deep frying machine had been successfully designed and was expected to facilitate the frying process and simultaneously proceed with the spinning process. This machine was designed to use a 0.373 kW motor, constructed from stainless steel and angle bars and hollows. The analysis results of the shaft planning data at a minimum diameter of 9.06 mm and the use of 25 mm-diameter shaft were declared safe with a stress analysis on the frame of 1.065 x 107 N/m2 which was still below its maximum stress. Therefore, the machine could be constructed based on this design and analysis

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Delgado, Adolfo, i Luis San Andrés. "Identification of Structural Stiffness and Damping Coefficients of a Shoed-Brush Seal". Journal of Vibration and Acoustics 129, nr 5 (5.06.2007): 648–55. http://dx.doi.org/10.1115/1.2775516.

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The multiple-shoe brush seal, a variation of a standard brush seal, accommodates arcuate pads at the bristles’ free ends. This novel design allows reverse shaft rotation operation and reduces and even eliminates bristle wear, since the pads lift-off due to the generation of a hydrodynamic film during rotor spinning. This type of seal, able to work at both cold and high temperatures, not only restricts secondary leakage but also acts as an effective vibration damper. The dynamic operation of the shoed-brush seals, along with the validation of reliable predictive tools, relies on the appropriate estimation of the seal structural stiffness and energy dissipation features. Single-frequency external load tests conducted on a controlled motion test rig and without shaft rotation allow the identification (measurement) of the structural stiffness and equivalent damping of a 20-pad brush seal, 153mm in diameter. The seal energy dissipation mechanism, represented by a structural loss factor and a dry friction coefficient, characterizes the energy dissipated by the bristles and the dry friction interaction of the brush seal bristles rubbing against each other. The physical model used reproduces well the measured system motions, even for frequencies well above the identification range.

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Boukhalfa, Abdelkrim. "Dynamic analysis of a spinning functionally graded material shaft by the p - version of the finite element method". Latin American Journal of Solids and Structures 11, nr 11 (2014): 2018–38. http://dx.doi.org/10.1590/s1679-78252014001100007.

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