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Journal articles on the topic 'Oscillating movement'

Author: Grafiati

Published: 28 June 2021

Last updated: 29 July 2025

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1

Behnke, Karsten, and Florian Schleich. "Exploring limiting factors of wear in pitch bearings of wind turbines with real-scale tests." Wind Energy Science 8, no. 2 (2023): 289–301. http://dx.doi.org/10.5194/wes-8-289-2023.

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Abstract. Oscillating movements under load can cause wear in rolling bearings. Blade bearings of wind turbines are subject to both. To know how to avoid wear in these bearings is important since they ensure the operational safety of the turbine. Oscillations of blade bearings vary in load, speed, and amplitude. The objective of this work is to find limits of these operating parameters with regards to wear occurrence. To this end several tests with real-size bearings were carried out. The test parameters are based on typical operating conditions of a reference turbine. The size of the bearings

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He, Zhang-Ming, Deng-Long Wang, Yan-Chao She, Jian-Wen Ding, and Xiao-Hong Yan. "Nonperiodic Oscillation of Bright Solitons in Condensates with a Periodically Oscillating Harmonic Potential 10.5560/ZNA.2012-0085." Zeitschrift für Naturforschung A 67, no. 12 (2012): 723–28. http://dx.doi.org/10.5560/zna.2012-0085.

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Considering a periodically oscillating harmonic potential, we explored the dynamic properties of bright solitons in a Bose-Einstein condensate by using Darboux transformation. It is found that the soliton movement exhibits a nonperiodic oscillation under a slow oscillating potential, while it is hardly affected under a fast oscillating potential. Furthermore, the head-on and/or ‘chase’ collisions of two solitons have been obtained, which could be controlled by the oscillation frequency of the potential.

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Zhileykin, Mikhail M., Pavel V. Sirotin, Sergey S. Nosikov, and Nikolay N. Pulyaev. "Method for detecting the loss of stability of the movement of tractors when towing a trailer or a coupled unit." Tractors and Agricultural Machinery 90, no. 1 (2023): 39–48. http://dx.doi.org/10.17816/0321-4443-321266.

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BACKGROUND:Currently, combines and tractors, being the most energy-intensive transport and technological machines for agricultural purposes, largely determine the possibility of transition to an efficient and environmentally friendly agricultural economy, and also provide the technical aspect of the transformation of the agro-industrial complex into the leading sector of the countrys industry. One of the sources of dynamic loads in the units and subsystems of tractor equipment are self-oscillating modes. AIMS:Study of the conditions for the occurrence of self-oscillating processes in the

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Stosiak, Michał, Mykola Karpenko, Adam Deptuła, et al. "Modelling and Experimental Verification of the Interaction in a Hydraulic Directional Control Valve Spool Pair." Applied Sciences 13, no. 1 (2022): 458. http://dx.doi.org/10.3390/app13010458.

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This study examined the impact of mechanical oscillation on a hydraulic directional control valve. Particular attention was paid to the oscillating movement of the spool of the hydraulic directional control valve resulting from this impact. Different models of fluid and mixed friction were considered. The models analysed accounted for the relative movement of the directional control valve body and the fact that it is kinematically excited by external mechanical oscillations. It was observed that the mixed friction model, where the frictional force is considered to be the sum of molecular force

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Gutnik, B. J., and B. Hyland. "Lateralized Spatial Strategies in Oscillating Drawing Movements." Perceptual and Motor Skills 84, no. 2 (1997): 435–51. http://dx.doi.org/10.2466/pms.1997.84.2.435.

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Kinematic characteristics and lateral differences between two upper extremities were investigated in a unimanual graphic task involving fast and precise oscillating movements on the vertical plane. The spatial locations of sequential reversal points were used to calculate the pairs of angles, relative to the horizontal axis. The point biserial coefficient of correlation was used to analyze the difference between big and large angles and their sequence in each pair. Three main groups (A, B, and C) of performance models were distinguished in 132 tests by 33 strongly right-handed male subjects. G

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Wan, Xiaohu, Daniela Cimini, Lisa A. Cameron, and E. D. Salmon. "The coupling between sister kinetochore directional instability and oscillations in centromere stretch in metaphase PtK1 cells." Molecular Biology of the Cell 23, no. 6 (2012): 1035–46. http://dx.doi.org/10.1091/mbc.e11-09-0767.

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Kinetochores bound to kinetochore microtubules (kMTs) exhibit directional instability in mammalian and other mitotic vertebrate cells, oscillating between poleward (P) and away-from-the-pole (AP) movements. These oscillations are coupled to changes in length of kMTs in a way that maintains a net stretch of the centromere. To understand how sister kinetochore directional instability and kMT plus-end dynamic instability are coupled to oscillations in centromere stretch, we tracked at high resolution the positions of fluorescent kinetochores and their poles for oscillating chromosomes within spin

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Nizhegorodov, A. I., and V. Z. Lapshin. "IMPROVEMENT OF STRUCTURAL AND DYNAMIC PROPERTIES OF THE HEARTH PLATE OF AN ELECTRIC ROASTING FURNACE FOR BULK MATERIALS." Spravochnik. Inzhenernyi zhurnal, no. 333 (December 2024): 27–34. https://doi.org/10.14489/hb.2024.12.pp.027-034.

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In this work, we consider the basic dynamical system of electric roasting furnaces, i.e., an oscillating movable hearth plate for vibration displacement of bulk particles. The main disadvantage of oscillating dynamical systems consists in fluctuations in the oscillation amplitude due to its sensitivity to minor changes in the excitation and natural frequency, as well as to external factors. We report experimental data on the duration and velocity of movement of loose material along the hearth plate surface on the example of expanded vermiculite, which ensure the highest quality of the obtained

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Katrakova-Krüger, Danka, Sabine Weichert, and Christoph Hartl. "Influence of the Oscillation Parameters Amplitude and Frequency on the Microstructure of Laser-Welded Thin Nitinol Foils." Journal of Manufacturing and Materials Processing 9, no. 2 (2025): 32. https://doi.org/10.3390/jmmp9020032.

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Laser welding has become well established for joining Ni-Ti-based shape memory alloys and extends the manufacturability of highly functional components with complex geometries. Published studies on the effect of laser welding on alterations to microstructure and properties of these alloys, however, mainly deal with conventional component dimensions and linear laser beam movement. In view of the increasing importance of microtechnology, research into joining of thin-walled Ni-Ti components is therefore of interest. At the same time, studies comparing oscillating and linear beam movement on othe

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Kobayashi, H. "Annular Cascade Study of Low Back-Pressure Supersonic Fan Blade Flutter." Journal of Turbomachinery 112, no. 4 (1990): 768–77. http://dx.doi.org/10.1115/1.2927720.

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Low back-pressure supersonic fan blade flutter in the torsional mode was examined using a controlled-oscillating annular cascade test facility. Precise data of unsteady aerodynamic forces generated by shock wave movement, due to blade oscillation, and the previously measured data of chordwise distributions of unsteady aerodynamic forces acting on an oscillating blade, were joined and, then, the nature of cascade flutter was evaluated. These unsteady aerodynamic forces were measured by direct and indirect pressure measuring methods. Our experiments covered a range of reduced frequencies based o

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Upnere, S. "Numerical Study of Flow-Induced Vibrations of Multiple Flexibly-Mounted Cylinders in Triangular Array." Latvian Journal of Physics and Technical Sciences 55, no. 5 (2018): 43–53. http://dx.doi.org/10.2478/lpts-2018-0035.

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Abstract The paper presents the numerical study of vibrating multiple flexibly-mounted cylinders in a triangular rod bundle. Behavioural trends of six different clusters of oscillating rods have been analysed. The influence of neighbour cylinders on the central cylinder oscillation characteristics is analysed. Finite volume solver of open source computational fluid dynamics is used to calculate the fluid flow in the channel with the cylinder array. Built-in six degree-of-freedoms solver is utilised to simulate cylinder movement. Oscillating cylinders have two degrees-of-freedom. The obtained r

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Islam, Nabirul, Jochen Schanz, David Kolb, and Harald Riegel. "Improvement of Surface Quality and Process Area Rate in Selective Laser Melting by Beam Oscillation Scan Technique." Journal of Materials Engineering and Performance 30, no. 7 (2021): 5108–17. http://dx.doi.org/10.1007/s11665-021-05665-9.

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AbstractSelective laser melting (SLM) has potential benefits for additive manufacturing of complex and precise metal parts with required mechanical and material properties. However, the improvement of surface quality and the minimization of fabrication time still remark a challenge for efficient manufacturing by SLM. Among the process parameters, the scan strategy has a significant influence on process stability and quality of the final manufactured three-dimensional products. This paper demonstrates the investigation of an alternative scan strategy to improve the surface quality with a reduct

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KOSIYUK, M., А. KOSIYUK, and V. KRAVCHUK. "DESIGN OF MOVEMENT DIRECTION REVERSE CONVERTER." Herald of Khmelnytskyi National University. Technical sciences 291, no. 6 (2020): 55–61. https://doi.org/10.31891/2307-5732-2020-291-6-56-61.

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Direction transducers are used in many branches of mechanical engineering to convert the continuous rotation of the master link into reciprocating or reciprocating oscillating motion of the slave and, conversely, to convert the reciprocating motion into continuous. They are used in motion-converting mechanisms, internal combustion engines, reciprocating compressors and pumps, reciprocating feeders and other technological equipment. Designing mechanisms for converting rotational motion into oscillating motion and vice versa is an extremely important task. The present article deals with the mech

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Khawar, Obaidullah, M. F. Baig, and Sanjeev Sanghi. "Skin-friction drag reduction by axial oscillations of the inner cylinder in turbulent Taylor–Couette flows." Physics of Fluids 35, no. 4 (2023): 045123. http://dx.doi.org/10.1063/5.0142862.

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Skin-friction drag reduction by axial oscillations of an inner cylinder is numerically investigated at radius ratio ( η = 0.5) using direct numerical simulation. In the present study, at fixed optimal oscillating period, the effect of oscillating amplitude on skin-friction drag reduction is investigated in detail. Furthermore, the effect of Reynolds number (ranging from 1000 to 5000) is also investigated. Our results show that as we keep increasing the oscillating amplitude, the drag reduction first increases and then decreases after a critical threshold dependent on the considered Reynolds nu

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Nazarenko, Ivan, and Yevhen Mishchuk. "RESEARCH OF PARAMETERS AND MODES OF THE VIBRATION CRUSHER." Construction Engineering, no. 1(38) (June 28, 2023): 10–17. http://dx.doi.org/10.32347/tb.2023.1-38.0102.

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One of the main directions of research on machines for the production of building ma-terials is the reduction of energy consumption. Solving the problem related to the determination of energy consumption is a rather difficult task, since energy consumption depends on a number of factors that change during the operation of the machine and are difficult to accurately describe. One of the areas of development of machines for the production of construction materials is the creation of resonant vibration machines. Based on the analysis of the latest researches, the prospects of vibrating jaw crushe

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Shtanko, Oleksandr, Maryna Litvinova, Iryna Zorina, Svitlana Karpova, and Roman Avdiunin. "Improving the oscillating wind turbine model." Eastern-European Journal of Enterprise Technologies 3, no. 8 (123) (2023): 46–53. http://dx.doi.org/10.15587/1729-4061.2023.281228.

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Disadvantages in the structure of the most common rotary wind generators limit their use. This motivates the development of alternative types of wind turbines, the most promising of which are oscillating wind generators. The object of the study is the structure of an oscillating type wind generator, which provides self-oscillating movement of the blade-wing. The design of the wind generator uses a modified wing shape to provide maximum lift. For this purpose, added elements are the tip and flap, which affect the shape of the wing, its angle of attack, and regulate the direction of the lifting

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Lu, Liang, Shirang Long, and Kangwu Zhu. "A Numerical Research on Vortex Street Flow Oscillation in the Double Flapper Nozzle Servo Valve." Processes 7, no. 10 (2019): 721. http://dx.doi.org/10.3390/pr7100721.

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The oscillating flow field of the double nozzle flapper servo valve pre-stage is numerically analyzed through Large Eddy Simulation (LES) turbulent modeling with the previous grid independence verification. The vortex street flow phenomenon can be observed when the flow passes through the nozzle flapper channel, the vortex alternating in each side produces the periodical flow oscillation. The structural and flow parameter effects on the oscillating flow are emphasized, and it could be determined that the pressure on the flapper is nearly proportional to the flow velocity and inversely proporti

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Bespalov, A. L., I. G. Svidrak, and O. O. Boiko. "Study of the dynamic model of the oscillating system of vibratory feeders with an elliptical trajectory of the movement of the working body." Scientific Messenger of LNU of Veterinary Medicine and Biotechnologies 24, no. 98 (2022): 76–81. http://dx.doi.org/10.32718/nvlvet-f9814.

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Vibrating feed bins with electromagnetic drive are widely used in the automation of production processes in mechanical engineering and instrument engineering. They are used for feeding miniature, small, or medium-sized parts to automated production equipment. These parts must be located in a certain stable position, that is, oriented in space, when using these feeders to feed component parts to the assembly position in assembly machines. Different means of orientation may be applied, which are directly located in the bunkers of these devices, in this case. The parts must be transported without

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18

Bulgakov, V., V. Adamchuk, І. Holovach, and Ye Ihnatiev. "Mathematical model of the movement of a towed machine for cleaning beet tops residues from root crop heads." Agricultural Science and Practice 4, no. 1 (2017): 3–10. http://dx.doi.org/10.15407/agrisp4.01.003.

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The work of a tractor-towed machine for cleaning beet top residues from root crop heads, when used with supporting pneumatic wheels, is accompanied with its oscillations in the vertical plane, which has consider- able impact on the quality of implementing the technological process. Therefore, the determination of opti- mal parameters for the cleaning machine, ensuring more stable movement of its cleaning working tool, in the longitudinal-vertical plane fi rst and foremost, is an important task of the mechanization of sugar beet grow- ing industry. Aim. To enhance the effi ciency of cleaning su

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Ohorodnyk, N., K. Smolianinov, and M. Ratsky. "Cellular and humoral immunity of carp at the action of biologically active additives." Agricultural Science and Practice 4, no. 1 (2017): 70–73. http://dx.doi.org/10.15407/agrisp4.01.070.

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The work of a tractor-towed machine for cleaning beet top residues from root crop heads, when used with supporting pneumatic wheels, is accompanied with its oscillations in the vertical plane, which has consider- able impact on the quality of implementing the technological process. Therefore, the determination of opti- mal parameters for the cleaning machine, ensuring more stable movement of its cleaning working tool, in the longitudinal-vertical plane fi rst and foremost, is an important task of the mechanization of sugar beet grow- ing industry. Aim. To enhance the effi ciency of cleaning su

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20

Wall, C., A. Assad, G. Aharon, P. S. Dimitri, and L. R. Harris. "The human oculomotor response to simultaneous visual and physical movements at two different frequencies." Journal of Vestibular Research 11, no. 2 (2001): 81–89. http://dx.doi.org/10.3233/ves-2001-11203.

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In order to investigate interactions in the visual and vestibular systems' oculomotor response to linear movement, we developed a two-frequency stimulation technique. Thirteen subjects lay on their backs and were oscillated sinusoidally along their z-axes at between 0.31 and 0.81 Hz. During the oscillation subjects viewed a large, high-contrast, visual pattern oscillating in the same direction as the physical motion but at a different, non-harmonically related frequency. The evoked eye movements were measured by video-oculography and spectrally analysed. We found significant signal level at th

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THO, PAUL, RICHARD MANASSEH, and ANDREW OOI. "Cavitation microstreaming patterns in single and multiple bubble systems." Journal of Fluid Mechanics 576 (March 28, 2007): 191–233. http://dx.doi.org/10.1017/s0022112006004393.

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Cavitation microstreaming is a well-known phenomenon; however, few flow visualizations or measurements of the velocity fields have been conducted. In this paper micro-PIV (particle image velocimetry) measurements and streak photography were used to study the flow field around a single and two oscillating bubbles resting on a solid boundary. The mode of oscillation of the bubble was also measured in terms of the variation in the radius of the bubble and the movement of the bubble's centroid so that the streaming flow field could be accurately related to the bubble's oscillatory motion. The mode

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Madi, Madi, Muhammad Gufran Nurendrawan Bangsa, Bintari Citra Kurniawan, et al. "Experimental Study of The Fan Turbine Performance in Oscillating Water Column with Airflow System in Venturi Directional." WAVE: Jurnal Ilmiah Teknologi Maritim 17, no. 1 (2023): 34–42. http://dx.doi.org/10.55981/wave.2023.819.

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The Indonesian Ocean Energy Association has ratified the potential for ocean wave energy in Indonesia with a theoretical potential of 141,472 Megawatts. Unfortunately, this vast potential has not yet been utilized optimally in the Indonesian seas. Ocean wave energy technology has developed rapidly in various countries worldwide. One of the most famous ocean wave power generation technologies is the Oscillating Water Column (OWC), which utilizes airflow from ocean waves oscillating movement. Inspired by OWC, an innovative ocean wave power generation technology model was designed using a simpler

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Loveikin, Viacheslav, Yurii Romasevich, Liubov Shymko, Yurii Loveikin, and Kostiantyn Pochka. "The dynamic analysis of the joint trolley movement and hoisting mechanism in the tower crane." Strength of Materials and Theory of Structures, no. 108 (May 30, 2022): 267–82. http://dx.doi.org/10.32347/2410-2547.2022.108.267-282.

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The task of this paper is to research the simultaneous use of trolley and hoisting mechanism by the tower crane with a beam jib. To conduct research, a dynamic model of joint movement of mechanisms has been developed, which takes into account the main movement of drive mechanisms and oscillating movement of the load on a flexible suspension and links of mechanisms with elastic properties. A mathematical model of the motion of mechanisms is constructed on the basis of a dynamic model with the help of Lagrange equations of the second kind. For a specific jib system of the tower crane, dynamic ca

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Kotliarov, Volodymyr, Oleksandr Voloshchenko, Oleksandr Kuznetsov, and Mykola Kushnirenko. "Simulation of beating modes during the rotary-oscillating movement of complex aerodynamic engineering with determination of the conditions of their occurrence." Strength of Materials and Theory of Structures, no. 107 (October 29, 2021): 288–300. http://dx.doi.org/10.32347/2410-2547.2021.107.288-300.

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The aim of the article is to determine the conditions of occurrence of beating modes in a nonlinear high-order dynamic system with subsequent computer simulation of these modes. Methods of research of nonlinear oscillatory systems are applied with consideration of two cases of interrelation on rotation (weak and strong) between oscillatory circuits. In the first of them, the conditions for the existence of beating modes are approximately the same values of the partial frequencies of longitudinal and lateral oscillating motions with a constant increase in the modulus of the phase shift be

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Babii, Andrii, Ivan Holovetskyi, and Vitalii Boiko. "Analysis of the behavior of potato bearing layer particles on the oscillating plane of the potato plant ploughshare." Scientific journal of the Ternopil national technical university 116, no. 4 (2024): 78–89. https://doi.org/10.33108/visnyk_tntu2024.04.078.

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New design of the vibrating undermining operating body of potato harvesting machine where the specificity is that the plane of such ploughshare performs oscillating movements according to a certain law was proposed in this paper. Therefore, each point of the plane has different transporting and separating ability. The design and description of this operating body is presented in this paper. On the basis of its kinematic scheme the calculated dependencies which determine the conditions of movement of the individual particle by its plane are given. The above mentioned technique made it possible

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Gutnik, B. J., J. Nicholson, W. Go, D. Gale, and D. Nash. "Are Temporal Characteristics of Fast Repetitive Oscillating Movement Invariant?" Perceptual and Motor Skills 96, no. 3 (2003): 1027–39. http://dx.doi.org/10.2466/pms.2003.96.3.1027.

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Nago, H., and S. Maeno. "Movement of Sand behind Reventment under Oscillating Water Pressure." PROCEEDINGS OF THE JAPANESE CONFERENCE ON HYDRAULICS 32 (1988): 595–600. http://dx.doi.org/10.2208/prohe1975.32.595.

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Lu, Xingjie, Lin Ren, Qingyu Gao, et al. "Photophobic and phototropic movement of a self-oscillating gel." Chemical Communications 49, no. 70 (2013): 7690. http://dx.doi.org/10.1039/c3cc44480e.

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Popescu, Daniel. "DETERMINING THE BALANCE CONFIGURATION, IN CASE OF THE OSCILLATING MOVEMENT OF THE MAIN SPINDLE AT CNC LATHE." International Journal of Engineering Technologies and Management Research 7, no. 6 (2020): 41–46. http://dx.doi.org/10.29121/ijetmr.v2020.i7.6.692.

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In the paper we present a mathematical model through which are determined the balance conditions, needed for the stability analysis of the oscillating movement of the main spindle at CNC lathe. We take into account Hamilton's variation principle, the axiom of impulse derivative and the axiom of kinetic moment derivative. We present the general movement equations that generate the oscillations based on the calculus hypotheses, performing the introduction of the external solicitations. Establishment of the balance configuration is done by imposing the conditions that the system of forces that ac

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Popescu, Daniel. "DETERMINING THE BALANCE CONFIGURATION, IN CASE OF THE OSCILLATING MOVEMENT OF THE MAIN SPINDLE AT CNC LATHE." International Journal of Engineering Technologies and Management Research 7, no. 6 (2020): 41–46. http://dx.doi.org/10.29121/ijetmr.v7.i6.2020.692.

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In the paper we present a mathematical model through which are determined the balance conditions, needed for the stability analysis of the oscillating movement of the main spindle at CNC lathe. We take into account Hamilton's variation principle, the axiom of impulse derivative and the axiom of kinetic moment derivative. We present the general movement equations that generate the oscillations based on the calculus hypotheses, performing the introduction of the external solicitations. Establishment of the balance configuration is done by imposing the conditions that the system of forces that ac

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Ansini, Nadia, Andrea Braides, and Johannes Zimmer. "Minimizing movements for oscillating energies: the critical regime." Proceedings of the Royal Society of Edinburgh: Section A Mathematics 149, no. 03 (2018): 719–37. http://dx.doi.org/10.1017/prm.2018.46.

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AbstractMinimizing movements are investigated for an energy which is the superposition of a convex functional and fast small oscillations. Thus a minimizing movement scheme involves a temporal parameter τ and a spatial parameter ε, with τ describing the time step and the frequency of the oscillations being proportional to 1/ε. The extreme cases of fast time scales τ ≪ ε and slow time scales ε ≪ τ have been investigated in [4]. In this paper, the intermediate (critical) case of finite ratio ε/τ &gt; 0 is studied. It is shown that a pinning threshold exists, with initial data below the thres

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Zhou, Xiaoguo, Chengyao Sun, Jianhua Wang, Wentian Zhang, and Wanchao Zhang. "Viscous Damping Performance Analysis and Prediction of Axisymmetric Cylindrical Oscillating Buoys With Different Geometrical Configurations." Marine Technology Society Journal 56, no. 6 (2022): 32–45. http://dx.doi.org/10.4031/mtsj.56.6.7.

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Abstract With the intensification of the world's energy demand, clean and efficient marine energy has received more attention, and energy conversion devices are particularly important. As an important part of the oscillating wave energy conversion device, the hydrodynamic characteristics of cylindrical absorbers have a great impacton wave energy conversion efficiency. When cylindrical buoys with different bottom configurations heave under the action of waves, the oscillating motion and flow field become more complex. At present, potential flow theory is usually used to predict the motion respo

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Vokurka, Karel. "Experimental Study of Buoyancy of Spark-Generated Bubbles Oscillating in Water." Dynamics 5, no. 2 (2025): 22. https://doi.org/10.3390/dynamics5020022.

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The buoyancy of radially oscillating spark-generated bubbles is studied experimentally. Bubble sizes, defined as the maximum bubble radius, range from 26.6 to 52.1 mm, and the bubbles oscillate at a hydrostatic pressure of 127 kPa in a large expanse of liquid. We found that the position of these bubbles is relatively stable during the first two oscillations. They move upwards only in short time intervals when their size is, due to contraction, close to the minimum volume. The vertical movement, therefore, takes place in the form of steps. The relative heights of these steps, defined as the rat

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ШЕВЧЕНКО, Олександр, and Анастасія БЄЛЯЄВА. "EFFICIENCY OF KINEMATIC CHIP BREAKING ON A CNC LATHE." СУЧАСНІ ТЕХНОЛОГІЇ В МАШИНОБУДУВАННІ ТА ТРАНСПОРТІ 1, no. 20 (2023): 43–49. http://dx.doi.org/10.36910/automash.v1i20.1032.

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When turning many materials, especially such as high-alloyed steels and a some of non-ferrous metal alloys, long continuous chips are usually formed which clutter the working area of the machine tools and are dangerous for the workers. One of the effective and reliable methods of chip breaking during turning is vibration cutting, when the uniform motion of the cutter relative to the workpeace during the turning process is superimposed with an additional vibration motion of the cutter. The use of oscillating movements of the cutter in the direction of longitudinal feed is the most effective for

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Quadrio, Maurizio. "Drag reduction in turbulent boundary layers by in-plane wall motion." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 369, no. 1940 (2011): 1428–42. http://dx.doi.org/10.1098/rsta.2010.0366.

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Drag-reduction techniques capable of reducing the level of turbulent friction through wall-parallel movement of the wall are described, with special emphasis placed on spanwise movement. The discussion is confined to active open-loop control strategies, although feedback control is briefly mentioned with regard to peculiarities of spanwise sensing and/or actuation. Theoretical considerations are first given to explain why spanwise motion is expected to be particularly effective in skin-friction drag reduction. A review of the spanwise oscillating-wall technique is given next, with discussion o

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Wortmann, M., and W. Zarnack. "WING MOVEMENTS AND LIFT REGULATION IN THE FLIGHT OF DESERT LOCUSTS." Journal of Experimental Biology 182, no. 1 (1993): 57–69. http://dx.doi.org/10.1242/jeb.182.1.57.

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1. We simultaneously recorded lift/body weight, flight speed, body angle and 12 variables of wing movement for locusts performing tethered long-term flight with low movement scatter. The movements of the forewings and hindwings were recorded in three dimensions by means of miniature induction coils. 2. By adjusting the body angle, we could reproducibly manipulate lift generation as a consequence of induced changes in the wings' movement patterns. We were therefore able to analyse various relationships between the movement patterns and lift. 3. The most prominent variations of kinematic variabl

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Shi, Qiang, and Chuan-Feng Chen. "Step-by-step reaction-powered mechanical motion triggered by a chemical fuel pulse." Chemical Science 10, no. 8 (2019): 2529–33. http://dx.doi.org/10.1039/c8sc05469j.

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SPIRIN, ANATOLY, and YEVHENII VOLYNETS. "VIBRATORY CONVEYOR FOR LOADING FOOD MIXTURE MIXER." Herald of Khmelnytskyi National University. Technical sciences 337, no. 3(2) (2024): 328–33. http://dx.doi.org/10.31891/2307-5732-2024-337-3-49.

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The uniform supply of components to the mixing chamber is one of the main keys to the high-quality performance of this technological process. Currently, there is a lack of reliable feeders for mixers of food mixtures, especially of low productivity. This led to conducting analytical studies that make it possible to develop an effective design of the feeder, to determine the rational parameters of its work. As the analysis of the existing designs of feeders for loose materials showed, the problem of providing dosed supply of seeds or other particles in small volumes to the working chamber of th

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Zhileykin, M. M. "Research of Self-Oscillating Processes in the Zone of Interaction of an Elastic Tire with a Solid Support Base." Proceedings of Higher Educational Institutions. Маchine Building, no. 10 (739) (October 2021): 3–15. http://dx.doi.org/10.18698/0536-1044-2021-10-3-15.

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When two bodies interact in contact, self-oscillations or relaxation vibrations can occur, which are vibrations of parts of bodies relative to each other. The study of the processes occurring in the zone of an elastic tire interaction with a solid support base is of particular interest, since they directly affect the safety of movement of wheeled vehicles. The aim of the work is to study the conditions for the occurrence of self-oscillating processes in the zone of interaction of an elastic tire with a solid support base in three rolling modes: traction, driven, and braking. It has been establ

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Zhang, Zhi Li, De Cai Li, Li Ming Huang, Qi Han, and Dan Shi. "Experimental Study on Magnetic Fluids Viscous Damper." Key Engineering Materials 492 (September 2011): 268–72. http://dx.doi.org/10.4028/www.scientific.net/kem.492.268.

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Magnetic fluids viscous damper is a new type of dampers, whose structure including magnetic fluids, permanent magnet and a non-magnetic container. Inside the non-magnetic container, magnetic fluids supports the permanent magnet to suspense in it and moves as a working element. Under the influence of external oscillatory inertia forces, the movement of the permanent magnet leads the damper to a viscous dissipation of the oscillating system energy. This kind of viscous damper is very suitable for spacecraft under low frequency oscillation. In our experiments, model of magnetic fluids viscous dam

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Wang, Guan Ming, Zhi Xue Lu, and Dan Huang. "Macro Program Design of Variational Trapezoid Curve Disk Cam." Advanced Materials Research 338 (September 2011): 689–96. http://dx.doi.org/10.4028/www.scientific.net/amr.338.689.

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Based on the design parameters of disc CAM with the oscillating roller follower and modified trapezoid curve follower motion, by introducing macro program cyclic variable, the mathematical calculation model of macro program about cutter path of disc CAM with the holonomic constraint oscillating roller follower is established. The macro program is designed to can be adjusted quickly, according to the design parameters and the process parameters. The numerical control program completely parametric design is realized. So it provides programming methods and strategies for numerical control machini

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Saleh, Suleiman, and Chang-Hyun Sohn. "Power Extraction Performance by a Hybrid Non-Sinusoidal Pitching Motion of an Oscillating Energy Harvester." Energies 17, no. 11 (2024): 2451. http://dx.doi.org/10.3390/en17112451.

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This study proposes a hybrid pitching motion for oscillating flat plates aimed at augmenting the energy extraction efficiency of an energy harvester. The proposed hybrid pitching motion, within the first half cycle, integrates a non−sinusoidal movement starting at t/T = 0 and progressing to t/T = 0.25, with a sinusoidal movement initiating after t/T > 0.25 and continuing to t/T = 0.5. The second half of the cycle is symmetric to the first half but in the opposite direction. The calculated results show that the proposed hybrid pitching motion outperforms both the sinusoidal and the non−sinus

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Vrublevskyi, I. "Prospects of application of vibratory devices in military equipment." Military Technical Collection, no. 26 (June 23, 2022): 12–16. http://dx.doi.org/10.33577/2312-4458.26.2022.12-16.

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Possibilities of employing vibratory devices as conveying mechanisms in some models of military equipment, in particular in engineering weapons, are considered. Vibratory conveyors, which are widely used in industry for moving products over short distances, are mainly devices with one-component rectilinear oscillations, in which at the high conveying velocity the modes of movement with hopping are implemented, that is unacceptable for conveying many military facilities, including weapons and explosive objects. Vibratory conveying in non-hopping modes (without tossing) at high speed is possible

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Cowin, Stephen C., Gaffar Gailani, and Mohammed Benalla. "Hierarchical poroelasticity: movement of interstitial fluid between porosity levels in bones." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 367, no. 1902 (2009): 3401–44. http://dx.doi.org/10.1098/rsta.2009.0099.

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The governing equations for the theory of poroelastic materials with hierarchical pore space architecture and compressible constituents undergoing small deformations are developed. These equations are applied to the problem of determining the exchange of pore fluid between the vascular porosity (PV) and the lacunar–canalicular porosity (PLC) in bone tissue due to cyclic mechanical loading and blood pressure oscillations. The result is basic to the understanding of interstitial flow in bone tissue that, in turn, is basic to understanding of nutrient transport from the vasculature to the bone ce

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Omelyanov, Oleg. "EXPERIMENTAL EVALUATION OF ENERGY PARAMETERS OF BULK VIBROSEPARATION OF BULK PRODUCTS." Vibrations in engineering and technology, no. 4(103) (December 24, 2021): 61–67. http://dx.doi.org/10.37128/2306-8744-2021-4-7.

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The article presents the results of experiments to evaluate vibration parameters when using spatial oscillation excitation drive. Among the main directions of the intensification of the vibration technological action during separation of bulk agricultural products, not only the adjustment of amplitude-frequency characteristics can be noted, but also the improvement of the geometric and structural parameters of the drive mechanisms. Currently, in the processes of separation or classification of bulk masses by the method of siting separation, fixed sieves are displaced by sieves receiving an add

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Hrabovský, Leopold, Štěpán Pravda, and Martin Fries. "Sensor Monitoring of Conveyor Working Operation with Oscillating Trough Movement." Sensors 25, no. 8 (2025): 2466. https://doi.org/10.3390/s25082466.

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This paper presents measured vibration magnitudes on the trough surface and on the frame of a laboratory model of a vibrating conveyor, detected by acceleration sensors. The vibration source is a DC asynchronous vibration motor with two discs with unbalanced masses mechanically attached to the end parts of the rotor. The trough of the vibrating conveyor is supported by four rubber springs of two types, which are characterised by considerable spring stiffness. Digital signals were recorded using the DEWESoft SIRIUSi measuring apparatus, which carries information about the magnitude of acting vi

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Zaides, S. A., and Huu Hai Nguyen. "Influence of the Toroidal Tool Kinematics on Residual Stress-Strain State of the Surface Layer of Machine Parts." Proceedings of Higher Educational Institutions. Маchine Building, no. 7 (748) (July 2022): 33–41. http://dx.doi.org/10.18698/0536-1044-2022-7-33-41.

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The article considers an approach to increasing compressive residual stresses during surface plastic deforming. The technical idea is based on the consideration of the kinematics of the working tool. A new hardening process based on the circular oscillation of the working tool is proposed. Finite element modeling which allows determining the residual stresses arising during hardening of machine parts was used to prove the effectiveness of the new kinematics of the tool. It has been found that in terms of increasing residual stresses, the oscillating movement of the working roller is much more

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Rieder, C. L., E. A. Davison, L. C. Jensen, L. Cassimeris, and E. D. Salmon. "Oscillatory movements of monooriented chromosomes and their position relative to the spindle pole result from the ejection properties of the aster and half-spindle." Journal of Cell Biology 103, no. 2 (1986): 581–91. http://dx.doi.org/10.1083/jcb.103.2.581.

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During mitosis a monooriented chromosome oscillates toward and away from its associated spindle pole and may be positioned many micrometers from the pole at the time of anaphase. We tested the hypothesis of Pickett-Heaps et al. (Pickett-Heaps, J. D., D. H. Tippit, and K. R. Porter, 1982, Cell, 29:729-744) that this behavior is generated by the sister kinetochores of a chromosome interacting with, and moving in opposite direction along, the same set of polar microtubules. When the sister chromatids of a monooriented chromosome split at the onset of anaphase in newt lung cells, the proximal chro

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Kobayashi, H. "Effects of Shock Waves on Aerodynamic Instability of Annular Cascade Oscillation in a Transonic Flow." Journal of Turbomachinery 111, no. 3 (1989): 222–30. http://dx.doi.org/10.1115/1.3262259.

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The effects of shock waves on the aerodynamic instability of annular cascade oscillation were examined for rows of both turbine and compressor blades, using a controlled-oscillating annular cascade test facility and a method for accurately measuring time-variant pressures on blade surfaces. The nature of the effects and blade surface extent affected by shock waves were clarified over a wide range of Mach number, reduced frequency, and interblade phase angle. Significant unsteady aerodynamic forces were found generated by shock wave movement, which markedly affected the occurrence of compressor

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Popov, I. P., N. M. Filkin, V. V. Kharin, and A. A. Mityunin. "Modeling and Analysis of a Multidimensional Planar Monoreactive Oscillator." Vestnik IzhGTU imeni M.T. Kalashnikova 26, no. 3 (2023): 33–40. http://dx.doi.org/10.22213/2413-1172-2023-3-33-40.

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The work belongs to the field of mechanical engineering, namely: to oscillating mechanical systems. The relevance of the study is determined by the fact that fluctuations of inertial masses are found everywhere. In the field of construction and use of aviation and rocket technology, this topic is of particular importance. Like a three-dimensional plane coordinate system in the coordinate plane Z, a multidimensional system with n axes shifted relative to each other by angles can be considered. There is an arbitrary vector emanating from the origin. It is proved that the points which are the coo

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