Zeitschriftenartikel: „Rotating mechanism“

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Fujioka, Yasuo, und Tomotsugu Sakai. „Rotating Loosening Mechanism of a Nut Connecting a Rotary Disk Under Rotating-Bending Force“. Journal of Mechanical Design 127, Nr. 6 (27.02.2005): 1191–97. http://dx.doi.org/10.1115/1.2049087.

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Structures composed of a rotary disk and a shaft, which are fastened with bolts and nuts having tapered bearing surfaces, are loaded with a rotating-bending force. Upon investigation, two rotating mechanisms of the nut were derived. In one mechanism a high-pressure contact area is formed at the nearest loading point on threads and bearing surfaces. This leads to a difference in the curvature radii between the bearing surface of the disk and that of the nut. During the revolution of the disk, two friction torques occur in opposite directions on the bearing surface and the threads, respectively. The relative rotating direction of the nut is dominated by the greater torque. The other mechanism is due to the eccentricities caused by dimensional errors of the bolt, nut, and disk. By combining the two mechanisms, the rotations of the nuts either cause a loosening or tightening after many revolutions of the disk.

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Ardeljan, N. V., G. S. Bisnovatyi-Kogan und S. G. Moiseenko. „Magnetorotational Mechanism: Supernova Explosions and Ejections“. Symposium - International Astronomical Union 214 (2003): 117–20. http://dx.doi.org/10.1017/s0074180900194252.

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We made simulations of the collapse of the rotating protostellar cloud. Differential rotation leads to the amplification of the toroidal component of the magnetic field and subsequent ejection of the matter due to the magnetorotational mechanism.Our results show that at different initial configurations of the magnetic field formation of qualitatively different types of explosion takes place. Magnetic field of the dipole type produces a jet-like explosion. Quadrupole-like magnetic field produces supernova explosion whith ejection presumably near equatorial plane. Quantitative estimations of the ejected mass and energy are given.We have done simulation of the collapse of the white dwarf and formation of a differentially rotating neutron star. After the collapse stage the rotating neutron star was formed. The rotation of the neutron star is strongly differential. The presence of the magnetic field (even the weak one) could produce magnetorotational supernova explosion.For the simulations we have used 2D numerical scheme, based on the specially developed numerical method (conservative, implicit, triangular grid, Lagrangian, grid reconstruction).

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Chai, Fu Jun, und Jin You Xu. „Kinematic Analysis of Clamping and Rotating Mechanism“. Advanced Materials Research 308-310 (August 2011): 2003–7. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.2003.

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In order to realize accurate rotation of steel pipe in automatic rolling pipe bender, a tilt cylinder six bar mechanism driven by pneumatic cylinder was presented. Based on the analysis of mechanism motion’s state, the motion process was divided into three working stages: clamping, rotating and loosening back. And kinematics parameters in every phase of the mechanism were obtained by complex number vector method, furthermore the mechanism kinematics characteristics of the whole process were gained. The results of the simulation example indicated that the mechanism has less change in velocity and more smooth motion during clamping and rotating stages.

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NOMURA, Aktio, Masahiro FUJITA, Masaki Ozawa, Eri TAKANE, Hirone KOMATSU, Kenjiro TADAKUMA, Masashi Konyo und Satoshi Tadokoro. „Screw-type Differential Rotating Mechanism“. Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2017 (2017): 1P1—G10. http://dx.doi.org/10.1299/jsmermd.2017.1p1-g10.

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5

Seshasayanan, Kannabiran, und Alexandros Alexakis. „Condensates in rotating turbulent flows“. Journal of Fluid Mechanics 841 (23.02.2018): 434–62. http://dx.doi.org/10.1017/jfm.2018.106.

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Using a large number of numerical simulations we examine the steady state of rotating turbulent flows in triple periodic domains, varying the Rossby number $Ro$ (that measures the inverse rotation rate) and the Reynolds number $Re$ (that measures the strength of turbulence). The examined flows are sustained by either a helical or a non-helical Roberts force, that is invariant along the axis of rotation. The forcing acts at a wavenumber $k_{f}$ such that $k_{f}L=4$, where $2\unicode[STIX]{x03C0}L$ is the size of the domain. Different flow behaviours were obtained as the parameters are varied. Above a critical rotation rate the flow becomes quasi-two-dimensional and transfers energy to the largest scales of the system, forming large coherent structures known as condensates. We examine the behaviour of these condensates and their scaling properties close to and away from this critical rotation rate. Close to the critical rotation rate the system transitions supercritically to the condensate state, displaying a bimodal behaviour oscillating randomly between an incoherent-turbulent state and a condensate state. Away from the critical rotation rate, it is shown that two distinct mechanisms can saturate the growth of the large-scale energy. The first mechanism is due to viscous forces and is similar to the saturation mechanism observed for the inverse cascade in two-dimensional flows. The second mechanism is independent of viscosity and relies on the breaking of the two-dimensionalization condition of the rotating flow. The two mechanisms predict different scaling with respect to the control parameters of the system (Rossby and Reynolds), which are tested with the present results of the numerical simulations. A phase space diagram in the $Re,Ro$ parameter plane is sketched.

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Erasmus, N., D. Kramer, A. McNeill, D. E. Trilling, P. Janse van Rensburg, G. T. van Belle, J. L. Tonry, L. Denneau, A. Heinze und H. J. Weiland. „Discovery of superslow rotating asteroids with ATLAS and ZTF photometry“. Monthly Notices of the Royal Astronomical Society 506, Nr. 3 (10.07.2021): 3872–81. http://dx.doi.org/10.1093/mnras/stab1888.

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ABSTRACT We present here the discovery of a new class of superslow rotating asteroids (Prot ≳1000 h) in data extracted from the Asteroid Terrestrial-impact Last Alert System (ATLAS) and Zwicky Transient Facility (ZTF) all-sky surveys. Of the 39 rotation periods we report here, 32 have periods longer than any previously reported unambiguous rotation periods currently in the Asteroid Light Curve Data base. In our sample, seven objects have a rotation period >4000 h and the longest period we report here is 4812 h (∼200 d). We do not observe any correlation between taxonomy, albedo, or orbital properties with superslow rotating status. The most plausible mechanism for the creation of these very slow rotators is if their rotations were slowed by YORP spin-down. Superslow rotating asteroids may be common, with at least 0.4 per cent of the main-belt asteroid population with a size range between 2 and 20 km in diameter rotating with periods longer than 1000 h.

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Chai, Fu Jun, Jin You Xu und Ying Xu. „Kinematics Simulation of Steel Tube Rotating Mechanism Based on ADAMS“. Applied Mechanics and Materials 130-134 (Oktober 2011): 2647–50. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.2647.

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Taking a new steel tube rotating mechanism as the research object, the model is simplified and the virtual prototyping model of the mechanism is established. The mechanism kinematics simulation is carried out with ADAMS simulation software. The motion law and state in two conditions are comparatively analyzed. Analysis results show that, in steel tube clamping stage the motion of the clip rod is of variable deceleration; And in rotating stage, mechanism is of accelerated rotation with variable acceleration when the cylinder input, while mechanism is of uniform rotation when the crank input； And then the cylinder is with positive and reverse swings throughout the movement process. The analysis results provide the basis for institution parameter selection and structure optimization design.

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Deng, Hao, Cun Yun Pan und Xiao Cong Wang. „Non-Uniform Motion Mechanisms Utilized in a Twin-Rotor Piston Engine“. Applied Mechanics and Materials 184-185 (Juni 2012): 320–23. http://dx.doi.org/10.4028/www.scientific.net/amm.184-185.320.

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Non-uniform motion mechanisms (NUMM) utilized in a Twin-rotor piston engine (TRPE) are introduced. TRPE mechanism consists of two major components. One is energy conversion system (ECS), and the other is differential velocity drive mechanism (DVDM). DVDM is composed of NUMMs and ordinary gear train in this paper. NUMMs generate two non-uniform rotations with same pattern and different pace. Gear train duplicates the two rotations and causes the two rotors rotating with periodical oscillation.

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Дворжак, В. М. „ЗАСТОСУВАННЯ МЕХАНІЗМУ ЧЕТВЕРТОГО КЛАСУ ДЛЯ ПРИВОДУ ВУШКОВИХ ГОЛОК ОСНОВОВ’ЯЗАЛЬНОЇ МАШИНИ“. Bulletin of the Kyiv National University of Technologies and Design. Technical Science Series 146, Nr. 3 (11.01.2021): 15–24. http://dx.doi.org/10.30857/1813-6796.2020.3.1.

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Development and research of functionally-adequate target mechanisms of technological machines of light industry with application of applied CAE-programs. Used the apparatus of vector algebra; analytical and numerical methods for determining the position functions of planar mechanisms containing a structural group of the fourth class of the second order, based on the vector transformation of coordinates; random search method for metric synthesis of flat mechanisms; methods of computer visualization and animation of kinematic schemes of flat mechanisms of higher classes. Mathematical models describing the position functions of the mechanism of eyelets of a warp knitting machine containing a structural group of the fourth class of the second order with rotating kinematic pairs in the form of angles of moving links, free vectors constructed on these links and radius vectors of characteristic points of the mechanism as a function of the angle of rotation of the master crank. The geometrical parameters of the flat six-link mechanism of eyelets for the warp knitting machine containing the structural group of the fourth class of the second order with rotating kinematic pairs as a result of metric synthesis of the mechanism by random search in CAE-program are determined; computer circuit modeling of the obtained mechanism is performed; graphs of visualization and animation of the kinematic scheme of the received mechanism are constructed; identification of the kinematic scheme of the obtained mechanism for compliance with the accepted structure; the received graph of function of position of an auricular needle of the mechanism of the fourth class; the functions of the position of the eye needle of the new mechanism and the mechanism of the basic knitting machine OV-7 are compared. The structure of a flat six-link mechanism, containing structural groups of the fourth class of the second order with rotating kinematic pairs, is proposed for use as a drive in a warp knitting machine on the example of the mechanism of oscillating movement of eyelets. The geometric dimensions of the moving parts of the functionally adequate mechanism of the fourth class for the drive of the eye needles of the basic knitting machine are determined. Software blocks for automated computer metric synthesis and calculation of link angles and radius vectors of characteristic points of the mechanism in the CAE program have been created. Practical Value is to use the results for the design and construction of flat mechanisms of the fourth class with rotating kinematic pairs of warp knitting machines, in which the working bodies make stops during the work process.

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Дворжак, В. М. „ЗАСТОСУВАННЯ МЕХАНІЗМУ ЧЕТВЕРТОГО КЛАСУ ДЛЯ ПРИВОДУ ВУШКОВИХ ГОЛОК ОСНОВОВ’ЯЗАЛЬНОЇ МАШИНИ“. Bulletin of the Kyiv National University of Technologies and Design. Technical Science Series 146, Nr. 3 (11.01.2021): 15–24. http://dx.doi.org/10.30857/1813-6796.2020.3.1.

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Development and research of functionally-adequate target mechanisms of technological machines of light industry with application of applied CAE-programs. Used the apparatus of vector algebra; analytical and numerical methods for determining the position functions of planar mechanisms containing a structural group of the fourth class of the second order, based on the vector transformation of coordinates; random search method for metric synthesis of flat mechanisms; methods of computer visualization and animation of kinematic schemes of flat mechanisms of higher classes. Mathematical models describing the position functions of the mechanism of eyelets of a warp knitting machine containing a structural group of the fourth class of the second order with rotating kinematic pairs in the form of angles of moving links, free vectors constructed on these links and radius vectors of characteristic points of the mechanism as a function of the angle of rotation of the master crank. The geometrical parameters of the flat six-link mechanism of eyelets for the warp knitting machine containing the structural group of the fourth class of the second order with rotating kinematic pairs as a result of metric synthesis of the mechanism by random search in CAE-program are determined; computer circuit modeling of the obtained mechanism is performed; graphs of visualization and animation of the kinematic scheme of the received mechanism are constructed; identification of the kinematic scheme of the obtained mechanism for compliance with the accepted structure; the received graph of function of position of an auricular needle of the mechanism of the fourth class; the functions of the position of the eye needle of the new mechanism and the mechanism of the basic knitting machine OV-7 are compared. The structure of a flat six-link mechanism, containing structural groups of the fourth class of the second order with rotating kinematic pairs, is proposed for use as a drive in a warp knitting machine on the example of the mechanism of oscillating movement of eyelets. The geometric dimensions of the moving parts of the functionally adequate mechanism of the fourth class for the drive of the eye needles of the basic knitting machine are determined. Software blocks for automated computer metric synthesis and calculation of link angles and radius vectors of characteristic points of the mechanism in the CAE program have been created. Practical Value is to use the results for the design and construction of flat mechanisms of the fourth class with rotating kinematic pairs of warp knitting machines, in which the working bodies make stops during the work process.

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Cavalini, Aldemir Ap, Thiago Vianna Galavotti, Tobias Souza Morais, Edson Hideki Koroishi und Valder Steffen. „Vibration Attenuation in Rotating Machines Using Smart Spring Mechanism“. Mathematical Problems in Engineering 2011 (2011): 1–14. http://dx.doi.org/10.1155/2011/340235.

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This paper proposes a semiactive vibration control technique dedicated to a rotating machine passing by its critical speed during the transient rotation, by using a Smart Spring Mechanism (SSM). SSM is a patented concept that, using an indirect piezoelectric (PZT) stack actuation, changes the stiffness characteristics of one or more rotating machine bearings to suppress high vibration amplitudes. A Genetic Algorithm (GA) optimization technique is used to determine the best design of the SSM parameters with respect to performance indexes associated with the control efficiency. Additionally, the concept of ecologically correct systems is incorporated to this work including the PZT stack energy consumption in the indexes considered for the optimization process. Simulation carried out on Finite Element Method (FEM) model suggested the feasibility of the SSM for vibration attenuation of rotors for different operating conditions and demonstrated the possibility of incorporating SSM devices to develop high-performance ecologic control systems.

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Сальков, Николай, und Nikolay Sal'kov. „Formation of Cyclic Surfaces in Kinetic Geometry“. Geometry & Graphics 5, Nr. 4 (13.12.2017): 24–36. http://dx.doi.org/10.12737/article_5a17fbe3680f52.30844454.

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This paper is an evolution of the "Kinematic Compliance of Rotating Spaces" paper, previously published in the "Geometry and Graphics" journal №1, 2013. A great many of mechanisms are making rotational movement, wherein rotating parts of one mechanism are "invading" into a rotation zone belonging to parts of another rotating mechanism. The challenge is to prevent the collision of rotating parts belonging to two or more details with each other. This problem is particularly sensitive for machine engineering. In space navigation, where, in principle, there are no objects that are at rest, the problem of satellites collision with astronomical bodies rotating around their axes is also the urgent one. Therefore, the theory of kinematic matching for rotating spaces R31 and R32 when they are moving independently from each other is urgent too. Each of two considered spaces may have a uniform or non-uniform movement in a given direction, a curved movement or a rotational movement around the axis specified for each space. In this paper has been considered the formation of cyclic surfaces obtained by rotation of one space relative to another one and different orientations of the generating line relative to the axes. Has been considered one of the options for rotating spaces, when their axes are parallel. In such a case the generating line is located in the following positions: it is straight and parallel to the axis; it is straight and intersects the axis; the rectilinear generator is in a plane that is parallel to the plane of the axes; the generating line is a straight line of general position; the generating line is a space curve. Has been demonstrated application of the rotating spaces theory in mining, chemical and machine tool industries, made in the form of inventions, confirmed by copyright certificates of the USSR.

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Fowler, P. W., und S. D. Guest. „A symmetry analysis of mechanisms in rotating rings of tetrahedra“. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 461, Nr. 2058 (24.05.2005): 1829–46. http://dx.doi.org/10.1098/rspa.2004.1439.

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Rotating rings of tetrahedra are well known from recreational mathematics. Rings of N tetrahedra with N even are analysed by symmetry-adapted versions of classical counting rules of mechanism analysis. For N ≥ 6, a single state of self-stress is found, together with N −5 symmetry-distinct mechanisms, which include the eponymous rotating mechanism. For N =4 in a generic configuration, a single mechanism remains together with three states of self-stress, but, uniquely in this case, the mechanism path passes through a bifurcation at which the number of mechanisms and states of self-stress is raised by one.

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FUJIOKA, Yasuo, und Tomotsugu SAKAI. „Rotating Loosening Mechanism of Nut Connecting Rotary Disc under Rotating-Bending Force.“ Transactions of the Japan Society of Mechanical Engineers Series C 68, Nr. 676 (2002): 3705–11. http://dx.doi.org/10.1299/kikaic.68.3705.

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15

Uemura, Yuho, A. Koichi Hayashi, Makoto Asahara, Nobuyuki Tsuboi und Eisuke Yamada. „Transverse wave generation mechanism in rotating detonation“. Proceedings of the Combustion Institute 34, Nr. 2 (Januar 2013): 1981–89. http://dx.doi.org/10.1016/j.proci.2012.06.184.

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16

Bandera, C., M. Nicolich und A. Strozzi. „On the bursting mechanism in rotating rings“. Journal of Strain Analysis for Engineering Design 28, Nr. 3 (01.07.1993): 153–62. http://dx.doi.org/10.1243/03093247v283153.

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The bursting mechanism in roatating, bored discs is theoretically reviewed in the light of published experimental information. In particlar, the segmentation sequence in bursting wheels is analysed according to a curved bar modelling and to a quasi-static loading, where a dynamic correction factor is introduced which reconciles theory with experiments. Finally, a diagram reporting the number of wheel fragmented pieces in terms of the ratio of ring inner to outer radii is presented, based upon available experimental data and theoretical interpretation.

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Nakanishi-Matsui, Mayumi, Mizuki Sekiya, Robert K. Nakamoto und Masamitsu Futai. „The mechanism of rotating proton pumping ATPases“. Biochimica et Biophysica Acta (BBA) - Bioenergetics 1797, Nr. 8 (August 2010): 1343–52. http://dx.doi.org/10.1016/j.bbabio.2010.02.014.

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18

Zhang, Jiayu, Jie Li, Xiaorui Che, Xi Zhang, Chenjun Hu, Kaiqiang Feng und Tingjin Xu. „The Optimal Design of Modulation Angular Rate for MEMS-Based Rotary Semi-SINS“. Micromachines 10, Nr. 2 (10.02.2019): 111. http://dx.doi.org/10.3390/mi10020111.

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In previous studies, the semi-strapdown inertial navigation system (SSINS), based on microelectromechanical system (MEMS) sensors, had realized cross-range measurement of attitude information of high-spinning projectiles through construction of a “spin reduction” platform of the roll axis. However, further improvement of its measurement accuracy has been difficult, due to the inertial sensor error. In order to enhance the navigational accuracy, a periodically rotating method is utilized to compensate for sensor error, which is called rotation modulation. At present, the rotation scheme, as one of the core technologies, has been studied by a lot of researchers. It is known that the modulation angular rate is the main factor affecting the effectiveness of error modulation. Different from the long-endurance and low-dynamic motion characteristics of ships, however, the short-endurance and high-dynamic characteristics of the high-spinning projectile not only require the modulation angular rate to be as fast as possible but, also, the influence of the rotation speed error caused by rotating mechanism errors cannot be ignored. Combined with the rotation speed error of the rotating mechanism, this paper explored the relationship between modulation angular rate, device error, and the navigation error, and then proposed a design method for optimal modulation angular rate. Experiments were carried out to validate the performance of the method. In addition, the proposed method is applicable for rotation modulation systems with different types of motors as the rotating mechanism.

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Zhao, Hong Yan, Peng Fei Zhang und Yun Ma. „The Influence of the Flight Aerodynamic for Interactions of Wings and Body of the Honeybee“. Applied Mechanics and Materials 670-671 (Oktober 2014): 700–704. http://dx.doi.org/10.4028/www.scientific.net/amm.670-671.700.

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The flight mechanism of flapping-wing was studied by using the translation-rotation model. We established the flapping-coordinate of the wing, gave the equation of the motion, and simplified the flapping-wing model. The aerodynamic and vortices were simulated by the CFD software of Fluent. The leading-edge vortex generated in the translation phase, and delayed stall mechanism had an important effect on the high lift. In the rotation phase, lift peaks appear due to the wing rapidly rotating and rotational circulation mechanism. The aerodynamics were obtained in different amplitudes, frequencies, angles of attack, the locations of rotating axis and timings of rotation. The influence of these parameters on average lift coefficient is obvious, while it can be ignored to average drag coefficient. Keywords: wing, aerodynamics, vortices, numerical simulation.

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Jia, Yu Jing, Da Yu Zhang, Guang Zhen Cheng und Ying Jun Dai. „Rotating Clamping Device of the Hydraulic Prop Disassemble Machine Based on Hydromechanics“. Applied Mechanics and Materials 164 (April 2012): 344–47. http://dx.doi.org/10.4028/www.scientific.net/amm.164.344.

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This article introduces a rotating clamping device, using with the disassemblage machine of monomer hydraulic prop. It was used for clamping hydraulic prop, which was mainly comprised by the coupling mechanism, clamping mechanism and compressing mechanism. The coupling mechanism sleeve was bolted to the spindle. Clamping mechanism located at the end of sleeve, working with the spindle rotation. Compressing mechanism hang around the sleeve, not working with the spindle rotation. Compressing mechanism passed the clamping force through the thrust bearing, clamping the hydraulic prop. It was easy to operate. Clamping force is decentralized, the stress in cylinder was even, so the cylinders seldom distort, which reduced the impact, extending the life of the equipment.

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Huang, Qi, Zailun Liu, Xiaobing Wang, Qifei Li und Hui Quan. „Coupling Mechanism of Rotating Casing Effect and Impeller Structure of Roto-Jet Pump“. Shock and Vibration 2020 (24.10.2020): 1–13. http://dx.doi.org/10.1155/2020/8868188.

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An increase in internal pressure of a Roto-Jet pump is due to combined action of its impeller and rotating casing. Internal pressure of the pump chamber was determined according to outlet pressure of the impeller, and the influence of the rotary casing effect was ignored. To study the combined action mechanism of the rotating casing effect and impeller structure on the Roto-Jet pump, we used the open test bed of the Roto-Jet pump and four model pumps with impellers of different structures as research objects. We also conducted a comprehensive experimental study on the coupling mechanism between the rotating casing effect and impeller structure. Numerical calculation was performed to avoid the assumption of isotropic eddy viscosity, Reynolds stress linear pressure-strain model is selected, and the numerical calculation results are compared with the experimental results to verify its credibility. The results show that the rotating casing effect has multiple functions to reduce the friction loss of the disc, improve the pressure distribution inside the rotating casing, and increase the pump head. All scheme, pressure, and velocity fluctuations occur in the upstream and wake regions of the collecting pipe and the energy loss is concentrated in the upstream region. The difference in velocity distribution inside the collecting pipe is small and negligible. As long as the impeller and rotating casing continue to rotate synchronously, the liquid shear velocity at the same coordinate position of each scheme remains unchanged, and the liquid rotation angular velocity in the rotating casing is approximately 75% of the rotating casing which conforms to the rigid motion law. In the same scheme, the coefficient of uneven velocity inside the rotating casing gradually increases along the radial direction. The closer to the axis, the faster is the decrease of the peak tangential velocity and the velocity tends to be uniform. The size, shape, and position of the vortex core inside the rotating casing change constantly with various schemes. The distribution of vortex cores varies under each scheme. The front cover and rotating casing have a serious effect on the vortex core. The extremely poor analysis of the test results shows that the performance of the Roto-Jet pump is better when the closed impeller is rotated in synchronisation with the rotating casing. The advantages and disadvantages of each blade type can be determined according to the situation. The research results can exhibit the influence mechanism of the Roto-Jet pump shell effect. Selection of an impeller structure provides a reference.

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Bourguet, Rémi, und David Lo Jacono. „Flow-induced vibrations of a rotating cylinder“. Journal of Fluid Mechanics 740 (06.02.2014): 342–80. http://dx.doi.org/10.1017/jfm.2013.665.

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AbstractThe flow-induced vibrations of a circular cylinder, free to oscillate in the cross-flow direction and subjected to a forced rotation about its axis, are analysed by means of two- and three-dimensional numerical simulations. The impact of the symmetry breaking caused by the forced rotation on the vortex-induced vibration (VIV) mechanisms is investigated for a Reynolds number equal to $100$, based on the cylinder diameter and inflow velocity. The cylinder is found to oscillate freely up to a rotation rate (ratio between the cylinder surface and inflow velocities) close to $4$. Under forced rotation, the vibration amplitude exhibits a bell-shaped evolution as a function of the reduced velocity (inverse of the oscillator natural frequency) and reaches $1.9$ diameters, i.e. three times the maximum amplitude in the non-rotating case. The free vibrations of the rotating cylinder occur under a condition of wake–body synchronization similar to the lock-in condition driving non-rotating cylinder VIV. The largest vibration amplitudes are associated with a novel asymmetric wake pattern composed of a triplet of vortices and a single vortex shed per cycle, the ${\rm T} + {\rm S}$ pattern. In the low-frequency vibration regime, the flow exhibits another new topology, the U pattern, characterized by a transverse undulation of the spanwise vorticity layers without vortex detachment; consequently, free oscillations of the rotating cylinder may also develop in the absence of vortex shedding. The symmetry breaking due to the rotation is shown to directly impact the selection of the higher harmonics appearing in the fluid force spectra. The rotation also influences the mechanism of phasing between the force and the structural response.

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Huang, Shiping, Yong Tang, Zhaoxun Yuan und Xiaopeng Cai. „An Efficient Contact Model for Rotating Mechanism Analysis and Design in Bridge Construction“. Baltic Journal of Road and Bridge Engineering 16, Nr. 1 (29.03.2021): 57–76. http://dx.doi.org/10.7250/bjrbe.2021-16.515.

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The rotation superstructure construction method is a widespread technique in bridge engineering. The critical issue for the successful application of this technique is the contact interface analysis and design for the rotating mechanism. A semi-analytical method predicated upon obtaining a uniform distribution of pressure on the slide plates within the interface is proposed. The surface design typically generates a nonlinear stress distribution. It leads to local damage and local asperity interlocking, which increase the contact friction dramatically during the rotation. In contrast, the proposed approach provides a surface that avoids stress concentrations and is expected to reduce the material cost of the slide plates. The proposed method is verified by the Finite Element Model. It can be used in a broad area involving contacting surface design, especially in the rotating mechanism design for bridge construction.

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Сальков, Николай, und Nikolay Sal'kov. „Formation of Surfaces Under Kinetic Displaying“. Geometry & Graphics 6, Nr. 1 (25.04.2018): 20–33. http://dx.doi.org/10.12737/article_5ad094a0380725.32164760.

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This work is the development of previously published ones in the journal "Geometry and Graphics" as follows: "Kinematic Correspondence of Rotating Spaces" (№ 1, 2013) and "Formation of Cyclic Surfaces in Kinetic Geometry" (№ 4, 2017). Many of mechanisms make rotational movement, wherein rotating parts of one mechanism "invade" into the zone of rotation for another rotating mechanism’s parts. At the same time, in addition to rotation, they can make other movements, both translational and rotational nature. The theory of kinetic geometry, of which this work is an integral part, is developed in order to avoid collisions of two or more parts of different mechanisms with each other. This is a rather complicated problem in mechanical engineering, in the mining industry, in metallurgy, and in space navigation, where there are no objects that are at rest. Therefore, the kinetic theory of matching for rotating spaces R1 3 and R23 when they are independent from each other movement is quite relevant. In this work have been considered cases for mapping of geometric figures of one space to another one when these figures are moving inside their space R13 . A theory which is presented has been called kinetic geometry, as it relates to engineering problems associated with gearings. These problems were addressed for the first time and drew-up as inventions. A monograph entitled "Introduction to Kinetic Geometry" is currently being prepared for publication.

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Adach, A., S. Wroński, M. Buczkowski, W. Starosta und B. Sartowska. „Mechanism of microfiltration on the rotating track membrane“. Separation and Purification Technology 26, Nr. 1 (Januar 2002): 33–41. http://dx.doi.org/10.1016/s1383-5866(01)00114-9.

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26

Li, Anhu, und Xinjian Gao. „Recent Patents on Rotating Double-Prism Scanning Mechanism“. Recent Patents on Mechanical Engineering 8, Nr. 1 (03.04.2015): 16–26. http://dx.doi.org/10.2174/2212797608666141219003653.

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Cook, Eugene H., Markus J. Buehler und Zoltan S. Spakovszky. „Mechanism of friction in rotating carbon nanotube bearings“. Journal of the Mechanics and Physics of Solids 61, Nr. 2 (Februar 2013): 652–73. http://dx.doi.org/10.1016/j.jmps.2012.08.004.

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ZHAO, QingJun, Wei ZHAO, JianZhong XU und XiaoYong ZHOU. „Counter-rotating compressor flow mechanism and aerodynamic design“. SCIENTIA SINICA Technologica 50, Nr. 10 (21.09.2020): 1359–75. http://dx.doi.org/10.1360/sst-2020-0088.

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XU, JianZhong, Wei ZHAO, XiuMing SUI und QingJun ZHAO. „Counter-rotating turbine flow mechanism and aerodynamic design“. SCIENTIA SINICA Technologica 50, Nr. 10 (24.09.2020): 1376–90. http://dx.doi.org/10.1360/sst-2020-0089.

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30

Essa, F. A., A. S. Abdullah und Z. M. Omara. „Rotating discs solar still: New mechanism of desalination“. Journal of Cleaner Production 275 (Dezember 2020): 123200. http://dx.doi.org/10.1016/j.jclepro.2020.123200.

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31

Liu, Yide, Binhong Liu, Tenghao Yin, Yuhai Xiang, Haofei Zhou und Shaoxing Qu. „Bistable rotating mechanism based on dielectric elastomer actuator“. Smart Materials and Structures 29, Nr. 1 (22.11.2019): 015008. http://dx.doi.org/10.1088/1361-665x/ab51d7.

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32

Liou, Y. C., J. M. Miao, T. L. Liu und S. J. Cheng. „Flow Mechanism of a Novel Active Micro-Rotor Mixer“. Advanced Materials Research 488-489 (März 2012): 1177–83. http://dx.doi.org/10.4028/www.scientific.net/amr.488-489.1177.

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The purpose of this study is to investigate the complex vortex flow patterns within a novel active micro-rotor mixer under various Reynolds numbers and rotating speeds by employing of CFD technique. The concept of present micro-rotor mixer is inspired from the Wankel-type combustor which is widely used in the power machines. The configuration of present micro-mixer is consisted of a rotor with shape of triangle column, a blending chamber and individual inlet and outlet ports. The blending chamber is served as the mixing chamber since the separated three sub-regions will change their volumes as the rotor undergoing the rotating motion with a fixed eccentricity. The dynamic flow patterns and mixing process of two species within the mixing chamber were simulated and visualized with streak lines. The governing equations are unsteady, two-dimensional incompressible Navier-Stokes equation and the two working fluids are pure water and alcohol. The concentration equation for species is also solved to reveal the mass transfer process in various sub-regions then being calculated on the outlet port to evaluate the mixing efficiency. The dynamic mesh technique was applied to re-distribute the computational meshes when the rotor finished a complete rotation cycle. Inspection on the flow developing stages within the mixing chamber over one complete cycle, it seems that multi-vortex flow field was generated due to the interaction of the shear force from the rotor, viscous force and inertial force of working fluids. The Coanda flow appeared in some conditions. When the Reynolds number is below of 10, the rotating speed of rotor has less influence on the mixing efficiency. An obvious enhancement in the mixing efficiency can be found in cases of the rotating speed of rotor changed from 30 rpm to 150 rpm when the Reynolds number in range of 25 to 100. Generally, the maximum mixing efficiency of 85% can be achieved for 1<Re<100 which demonstrated that present design was effective for μ-TAS.

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Liu, Xu Hui, Ying Hui Liu und Ding Feng. „Downhole Propulsion/Steering Mechanism for Wellbore Trajectory Control in Directional Drilling“. Applied Mechanics and Materials 318 (Mai 2013): 185–90. http://dx.doi.org/10.4028/www.scientific.net/amm.318.185.

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Advanced directional drilling, especially rotary steerable systems, provides directional control of wellbore while continuously rotating the drill bit. Downhole propulsion/steering mechanism is one of the key components in rotary closed-loop drilling system. Downhole steering/propulsion mechanisms currently used for directional control include adjustable stabilizer, steerable downhole motor and steering actuators used in state-of-the-art rotary steerable systems. The novel electro-mechanical propulsion and steering mechanisms are introduced, in order to produce downhole weight on bit (WOB) and directional control of the drill bit while rotating it as well. The mechanisms are based on high-reduction ratio planetary gear system and DC motor. This propulsion/steering mechanism introduces a unique rotary steering method with a manner of turning screw inside borehole. As a downhole propulsion/steering mechanism, it can be integrated with an existing MWD system to provide directional control and downhole propulsion force on drill bit.

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Jiang, Bing Hua, Li Fang und 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 speed decrease.

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CERRETELLI, C., und C. H. K. WILLIAMSON. „The physical mechanism for vortex merging“. Journal of Fluid Mechanics 475 (25.01.2003): 41–77. http://dx.doi.org/10.1017/s0022112002002847.

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In this paper, we study the interaction of two co-rotating trailing vortices. It is well-known that vortices of like-sign ultimately merge to form a single vortex, and there has been much work on measuring and predicting the initial conditions for the onset of merger, especially concerning the critical vortex core radius. However, the physical mechanism causing this merger has received little attention. In this work, we directly measure the structure of the antisymmetric vorticity field that causes the co-rotating vortices to be pushed towards each other during merger. We discover that the form of the antisymmetric vorticity comprises two counter-rotating vortex pairs, whose induced velocity field readily pushes the two centroids together. The merging velocity computed from the antisymmetric vorticity field agrees closely with the merging velocity measured directly from the total (original) flow field.The co-rotating vortex pair evolves through four distinct phases. The initial stage comprises a diffusive growth, which can be either viscous or turbulent. In either case, the number of turns that they rotate around one another until the vortices start to merge increases with Reynolds number (Re). If one observes the streamlines in a rotating reference frame (moving with the vortices), then one finds an inner and outer recirculating region of the flow bounded by a separatrix streamline. When the vortices grow large enough in the first stage, diffusion across the separatrix places vorticity into the outer recirculating region of the flow, and this leads to the generation of the antisymmetric vorticity, causing convective merger. This second (convective) stage corresponds to the motion of the vortex centroids towards each other, and is a process which is almost independent of viscosity. During the late part of this stage, the antisymmetric vorticity is diminished by a symmetrization process, and the final merging into one vorticity structure is achieved by a second diffusive stage. The fourth and ultimate phase is one where the merged vortex core grows by diffusion.

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Wu, Meng Ling, Xiang Jun Zhang, Chun Tian und Ying Xi. „Design and Optimization of Rotating Mechanism for Wind Load Test-Bed of Aerodynamic Brake“. Advanced Materials Research 482-484 (Februar 2012): 1851–59. http://dx.doi.org/10.4028/www.scientific.net/amr.482-484.1851.

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To adjust the angle between braking panel of aerodynamic brake and the wind direction, the duct and the direction of the wind are fixed, and the panel is rotated horizontally. So a rotating mechanism should be designed out to make the aerodynamic braking equipment rotate horizontally. This paper emphatically completes the design of rotating control system. The rotating direction is controlled by two bevel gears; magnetic powder clutch is used to simplify the organization, optimize the control mechanism, and let electric signal control the movement of clutch directly; the rotary supporting mechanism is consist of slewing bear which have two functions, supporting and rotating, and this mechanism is more compact and stable. In a word, this mechanism realizes horizontal rotating of the test-bed. And it lays the foundation of experiments about aerodynamic braking system.

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Orvedahl, Ryan J., Nicholas A. Featherstone und Michael A. Calkins. „Large-scale magnetic field saturation and the Elsasser number in rotating spherical dynamo models“. Monthly Notices of the Royal Astronomical Society: Letters 507, Nr. 1 (13.08.2021): L67—L71. http://dx.doi.org/10.1093/mnrasl/slab097.

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ABSTRACT Numerical simulations are used to investigate large-scale (mean) magnetic field generation in rotating spherical dynamos. Beyond a certain threshold, we find that the magnitude of the mean magnetic field becomes nearly independent of the system rotation rate and buoyancy forcing. The analysis suggests that this saturation arises from the Malkus-Proctor mechanism in which a Coriolis-Lorentz force balance is achieved in the zonal component of the mean momentum equation. When based on the large-scale magnetic field, the Elsasser number is near unity in the saturated regime. The results show that the large and small magnetic field saturate via distinct mechanisms in rapidly rotating dynamos, and that only the axisymmetric component of the magnetic field appears to follow an Elsasser number scaling.

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Coller, B. D. „Hopf-Hopf Interactions of Surge and Rotating Stall“. Journal of Computational and Nonlinear Dynamics 1, Nr. 4 (06.06.2006): 320–27. http://dx.doi.org/10.1115/1.2338324.

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In this paper, we examine the interaction of two instabilities that occur in axial compressors using the Hopf-Hopf normal form. As a result, we illuminate some gaps in understanding the dynamics of standard compressor models. We find a possible dynamic mechanism, which explains certain “curious” behavior observed in experiments, and are able to predict and explain failure mechanisms in previously proposed control strategies.

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Zhao, J. S., und L. Yan. „Kinetics and Mechanism of Palladium Pressure-Cyanide Dissolution“. Applied Mechanics and Materials 446-447 (November 2013): 164–67. http://dx.doi.org/10.4028/www.scientific.net/amm.446-447.164.

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At room temperature and pressures, the reaction between sodium cyanide and platinum group metals (PGMs) does not occur because of poor kinetics. However, at elevated temperatures, PGMs can be leached by sodium cyanide like the reaction of gold. However, few rate expression which describe the leaching of Palladium in cyanide solution has been developed. In this paper, the rate of Palladium dissolution was measured in pressure clear cyanide solution using a Palladium rotating disk. The data at different rotation speed, cyanide concentrations, temperature and oxygen pressure are obtained. The dissolution rates were independent of rotation speed for oxygen-saturated solutions between 100-400rpm. With increasing temperature the dissolution rate is increased. With increasing cyanide concentration and oxygen pressure, the dissolution rate first increased to a maximum value and then decreased.

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Schulmeister, James C., J. M. Dahl, G. D. Weymouth und M. S. Triantafyllou. „Flow control with rotating cylinders“. Journal of Fluid Mechanics 825 (21.07.2017): 743–63. http://dx.doi.org/10.1017/jfm.2017.395.

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We study the use of small counter-rotating cylinders to control the streaming flow past a larger main cylinder for drag reduction. In a water tunnel experiment at a Reynolds number of 47 000 with a three-dimensional and turbulent wake, particle image velocimetry (PIV) measurements show that rotating cylinders narrow the mean wake and shorten the recirculation length. The drag of the main cylinder was measured to reduce by up to 45 %. To examine the physical mechanism of the flow control in detail, a series of two-dimensional numerical simulations at a Reynolds number equal to 500 were conducted. These simulations investigated a range of control cylinder diameters in addition to rotation rates and gaps to the main cylinder. Effectively controlled simulated flows present a streamline that separates from the main cylinder, passes around the control cylinder, and reattaches to the main cylinder at a higher pressure. The computed pressure recovery from the separation to reattachment points collapses with respect to a new scaling, which indicates that the control mechanism is viscous.

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Xiong, Qiuju, Huali Wang, Xueliang Wang, Shihui Deng, Yong Liu und Zhen Lv. „Experimental Investigation on Rotating Electrochemical Etching of a Micro Spiral Cylindrical Electrode“. Micromachines 10, Nr. 10 (16.10.2019): 704. http://dx.doi.org/10.3390/mi10100704.

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To realize the electrochemical etching of a micro spiral cylindrical electrode, a new method of rotating electrochemical etching is proposed, and its process is further studied. First, according to the electrochemical etching principle, the machining mechanism of rotating electrochemical etching of a micro spiral cylindrical electrode is introduced. Second, based on the spiral vortex theory in the Taylor-Couette system, the effect of the high-speed rotating cylindrical microelectrode on its external flow field is analyzed. Third, the effects of rotation direction, rotation speed, machining voltage, and machining time on the thread structure are analyzed by experiments. Finally, a spiral cylindrical microelectrode with good surface thread shape is fabricated within two minutes by using the optimized machining parameters. It is proved that the rotating electrochemical etching method is an easy way to fabricate a micro spiral cylindrical electrode with high efficiency and low cost.

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Liu, Chun Lei, und Guang Sheng Ren. „A Study on Co-Simulation for Rotating Mechanism of Bogie Separation Device Based on ADAMS/MATLAB“. Advanced Materials Research 694-697 (Mai 2013): 233–36. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.233.

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In the process of bogie separation device operations, rotating system is required to push bogie and settlement beam to rotate . After the completion of bogie wheel replacement and maintenance, they need to be pushed back to original position. This paper explains working principle of rotating mechanism of monorail vehicle bogie separation device and performs co-simulation and analysis of rotating mechanism based on ADAMS/MATLAB. Analysis results show that the rotating hinge mechanism and its proportional control system can completely meet the requirements of the rotary motion.

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Bae, Seung-Yong, Je-Sung Koh und Gwang-Pil Jung. „A Miniature Flapping Mechanism Using an Origami-Based Spherical Six-Bar Pattern“. Applied Sciences 11, Nr. 4 (08.02.2021): 1515. http://dx.doi.org/10.3390/app11041515.

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In this paper, we suggest a novel transmission for the DC motor-based flapping-wing micro aerial vehicles (FWMAVs). Most DC motor-based FWMAVs employ linkage structures, such as a crank-rocker or a crank-slider, which are designed to transmit the motor’s rotating motion to the wing’s flapping motion. These transmitting linkages have shown successful performance; however, they entail the possibility of mechanical wear originating from the friction between relative moving components and require an onerous assembly process owing to several tiny components. To reduce the assembly process and wear problems, we present a geometrically constrained and origami-based spherical six-bar linkage. The origami-based fabrication method reduces the number of the relative moving components by replacing rigid links and pin joints with facets and folding joints, which shortens the assembly process and reduces friction between components. The constrained spherical six-bar linkage enables us to change the motor’s rotating motion to the linear reciprocating motion. Due to the property that every axis passes through a single central point, the motor’s rotating motion is filtered at the spherical linkage and does not transfer to the flapping wing. Only linear motion, therefore, is passed to the flapping wing. To show the feasibility of the idea, a prototype is fabricated and analyzed by measuring the flapping angle, the wing rotation angle and the thrust.

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Studenikin, Alexander. „Neutrino energy quantization in rotating media: New mechanism for neutrino trapping inside dense rotating stars“. Journal of Physics: Conference Series 136, Nr. 4 (01.11.2008): 042026. http://dx.doi.org/10.1088/1742-6596/136/4/042026.

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Chen, Cheng, Liu Zhang und Wei Zhang. „On the transition of transient growth mechanism in Taylor–Dean flow“. Modern Physics Letters B 35, Nr. 10 (17.02.2021): 2150185. http://dx.doi.org/10.1142/s0217984921501852.

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We investigate optimal perturbation and its transient growth characteristics in Taylor–Dean flow theoretically. The parameter [Formula: see text], accounting for the ratio of average pumping velocity induced by azimuthal pressure gradient to rotating velocity by rotating cylinders, is varied from −5 to 5. The results show that for the rigid rotation case, the energy growth of optimal perturbation is increased with increasing magnitude of azimuthal pressure gradient. Further, both the main and secondary peak of the amplitude of azimuthal velocity are seen to be shifted towards the outer cylinder for wide gap case, and both are shifted oppositely towards the inner cylinder for narrow gap case. Viewing the time evolution of the energies in the three velocity components for wide gap case, anti-lift-up mechanism replaces lift-up mechanism as the dominant mechanism for energy growth, when [Formula: see text] changes from −5 to 5. While for narrow gap case, lift-up mechanism is always responsible for transient growth of axisymmetric perturbation, no matter how strong azimuthal pressure gradient is considered.

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Lee, Heow-Pueh. „Dynamics of a Flexible Rod in a Quick Return Mechanism“. Journal of Mechanical Design 116, Nr. 1 (01.03.1994): 70–74. http://dx.doi.org/10.1115/1.2919379.

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The equations of motion in matrix form are formulated for a flexible rod in a quick return mechanism using Hamilton’s principle and the assumed mode method. The rod is considered as an Euler beam. The crank is assumed to be rigid and rotating at a constant angular speed. The translating-rotating joint connecting the crank to the flexible rod is assumed to be a frictionless moving point support for the flexible rod. This support is regarded as a very stiff spring acting on the rotating flexible rod. Results of numerical simulations are presented for various prescribed crank positions, crank lengths, and crank speeds.

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Wang, Xiao Yi, Yong Qiang Zhang, Hui Xing Wang, Yin Ping Dong, Zhi Zhen Qiu und Fu Qiang Chen. „Research of Local Constraint for Simplified Half-Rotating Mechanism“. Applied Mechanics and Materials 826 (Februar 2016): 35–39. http://dx.doi.org/10.4028/www.scientific.net/amm.826.35.

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In order to meet the requirements of the bionic flying, traditional Half-Rotating Mechanism (HRM) should be simplified because its structure was too complex and heavy. The design idea of simplified HRM was firstly introduced in this paper. Simplified HRM could be achieved by adding a local constraint made of positioning slider and shaft with groove in the slider-crank mechanism. To make sure the movement of simplified HRM was smooth and reliable, relative motion characteristics of positioning slider in groove of shaft had been analyzed and the curve of shaft with groove had been designed. The key parameters, such as radius and center position of inner and outer arc, had been calculated. A case study based on Unigraphics software was finally given and different states of positioning slider in one running cycle had been shown. The study results indicated that the method of simplifying HRM was effective and design of local constraint was accurate. The above research would provide some helpful advices for HRM application.

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Wang, Xiao Yi, Jing Liang Liu, Fu Qiang Chen und Zhi Zhen Qiu. „Research on Ride Comfort of Half-Rotating Walking Mechanism“. Applied Mechanics and Materials 48-49 (Februar 2011): 971–75. http://dx.doi.org/10.4028/www.scientific.net/amm.48-49.971.

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Bionic walking mechanism is an important part of bionic motion machinery. According to the characteristics of biped walking, a new biped-imitating walking mechanism called Half-Rotating Walking Mechanism (HRWM) was developed using Half-Rotating Mechanism (HRM) which can generate asymmetrical motion. The drive way and walking principle of HRWM were firstly introduced. On the basis of deducing kinematical equations of HRWM, some main factors of ride comfort were presented, which include a new factor named relative amplitude that could be used to valuate the ride comfort of various walking mechanism. The optimization model of HRWM structure was then proposed, which took parameter relationship as design variable. The optimized result could be applicable to different size HRWM. Finally, the calculating result shows that HRWM with optimized parameter relationships has good performance on ride comfort in the process of walking.

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Uemichi, Akane, und Makihito Nishioka. „Combustion mechanism of ultralean rotating counterflow twin premixed flame“. Combustion Theory and Modelling 19, Nr. 1 (02.01.2015): 57–80. http://dx.doi.org/10.1080/13647830.2014.981587.

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Ristic, Zoran, Slobodan Ilic und Aleksandar Kari. „Friction and wear mechanism of the projectile rotating band“. Vojnotehnicki glasnik, Nr. 5 (2005): 397–405. http://dx.doi.org/10.5937/vojtehg0505397r.

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