Purpose: To examine the effects of a novel isoinertial eccentric-overload and vibration training (EVT) paradigm on change-of-direction (COD) speed and multiple performance tests applicable to soccer. Methods: Twenty-four young male players were assigned to an EVT (n = 12) or conventional combined (CONV, n = 12) group, once weekly for 11 wk. …
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tating eccentric masses inside the drum to cause a vibration of the drum, which makes the compaction work much more efficient by transmitting dynamic forces into the soil. Various types of dynamic drum excitation have been developed during the past decades, which do not only differ in their design, but also in their operating principle.
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The mechanism of action of the eccentric vibrating mill. Only the single-tube eccentric vibrating mill of Sieb-technik executes, through an exciter unit pro-vided outside, …
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Solve a spring-mass-damper system for different types of free-vibration response depending on the amount of damping. Compute the natural frequency, damping ratio, …
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[40]. The working principle embraces the advantages of both dynamic vibration absorbers and waveguide absorbers [40–42]. Early adoption of ABH principle in a DVA structure is a 1D reso-nant beam damper proposed by Zhou et al. [40], followed by more complex designs such as an ABH-based circular dynamic vibration
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tions. The vibration displacement of the rotor was compen-sated to upgrade the suspension performance of the rotor. However, the adaptive controller step factor is uncertain. In [27], the UMRP algorithm was proposed to compensate the unbalance mass position in an active magnetic bearing-rotor system. The eccentric vibration of the rotor was ...
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A. One-Times-Rotation Vibration—Electrical 1) Eccentric Rotor: An eccentric rotor, which means the rotor core OD is not concentric with the bearing journals, creates a point of minimum air gap which rotates with the rotor at one times rotational frequency. Associated with this there will be a net unbalanced magnetic force acting at the point of
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Principle of Operation Feeder tray motion is provided by eccentric weights mounted on synchronized, counter-rotating, twin motors. The motors are in balance with one another …
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The basic configuration of the M/RAD mechanical shaker is shown in the photograph. The table top is rigidly attached to the drive mechanism box which contains a pair of counter …
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generated increases and will cause vibration to increase. Fig 3. Rotor Vibration due to Unbalance Unbalance is independent of speed but centrifugal force is proportional to the square of the speed change (∗ ˙˝ ˛∗˚ ˜). If the speed is doubled, the centrifugal force quadruples. The amplitude of the vibration will increase if the
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6. Eccentric reducer Always use an eccentric reducer at the pump suction when a pipe size transition is required. Put the flat on top when the fluid is coming from below or straight (see next Figure) and the flat on the bottom when the fluid is coming from the top. This will avoid an air pocket at the pump suction and allow air to be evacuated.
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2 x eccentric masses x eccentricity Hence, the amplitude of vibration may be varied simply by changing the eccentric mass or the eccentricity of this mass. Note that a mechanical shaker maintains a constant displacement over its frequency range for any given setting of the eccentric weights and test mass.
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the upper scroll stationary. An eccentric motor shaft moves the lower scroll in an orbital pattern. A specially designed coupling, called an Oldham coupling, holds the lower scroll at a fixed angular position, preventing rotation and allowing radial movement in an orbital path. Compression Process When assembled, the flanks of the upper and lower
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Journal of Vibration and Acoustics 3 VIB-21-1334, Ji 63 flexural waves gradually reduces to zero when approaching the tapered edge, thus
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Download Free PDF. Effects of Frequency and Mass of Eccentric Balls on Picking Force of The Coffee Fruit for The As-Fabricated Harvesting Machines ... Studies of scientists around the world have applied the principle of vibration to produce the picking force for coffee fruits, and the picking force is known to be different from many factors in ...
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— Eccentric rotary machines are a widespread source of vibration in industry. Such vibrations can be easily reduced by placing a correction mass at an appropriate location on the rotor. However, eccentricity is subject to frequent changes in many cases, and there is a need to reduce the effects of imbalance automatically during operation.
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— This paper is focused on the internal resonances and nonlinear vibrations of an eccentric rotating composite laminated circular cylindrical shell subjected to the lateral excitation and the ...
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— Abstract. A previously proposed planar axisymmetric dynamic vibration absorber (DVA), with embedded acoustic black hole (ABH) features, has been shown to suffer from the very selective coupling with the host structure, thus compromising its vibration reduction performance. To tackle the problem, an eccentric ABH-based circular …
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— The analysis has been performed, by using Love's shell theory and Hamilton's principle, for different boundary conditions. Yang et al. [39] studied the free vibration, buckling, and dynamics of an ...
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— This paper presents a mathematical model of a new multi-striker eccentric shock-vibration mechanism (ESVM) with a crank-sliding bar vibration exciter (CSVE) and an arbitrary number of pistons.
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— A previously proposed planar axisymmetric dynamic vibration absorber (DVA), with embedded acoustic black hole (ABH) features, has been shown to suffer from the very selective coupling with the ...
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DOI: 10.16511/jki.qhdxxb.2016.22.007 Corpus ID: 125423288; Electromagnetic vibration characteristics of an eccentric rotor with a static load @article{Xueping2016ElectromagneticVC, title={Electromagnetic vibration characteristics of an eccentric rotor with a static load}, author={Xu Xueping and Han Qinkai and Chu.
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The eccentric bushing is avaible in two hardnesses, 45 and 60 sh. TECHNICAL CHARACTERISTICS APPLICATIONS ... ECCENTRIC BUSHINGS Optimal vibration damping and isolation. Fit to use for robust and safe constructions. Simple installation and application. Maximum load of bushing 45sh is about 300kg. Maximum load of bushing …
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Eccentric Mass Dynamic Vibration Absorber TGS-BTG-KJL - Free download as PDF File (.pdf), Text File (.txt) or read online for free. This document summarizes a study on a physical model of a two-degree-of-freedom dynamic vibration absorber system. Key points: 1) A physical model was built using low-cost materials like wood and springs to …
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— In this paper, a modified variational method is developed to study the free and forced vibration of coupled straight–curved beam systems with an arbitrary number of eccentric discontinuities (EDs).
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— Given the tendency of eccentric rotors to self-align in their bearings to their principal mass axis above the first critical, the goal of balancing should be to bring the principal mass axis coincident to the rotor's geometric axis, without producing rotor distortion or internal moments, thereby preventing these phenomena from occurring.
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— The original vibration time-frequency signals are demodulated by the demodulation method based on time-frequency analysis and principal component analysis (DPCA).
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A. One-Times-Rotation Vibration—Electrical 1) Eccentric Rotor: An eccentric rotor, which means the rotor core OD is not concentric with the bearing journals, creates a point of …
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Proceedings of RIT 2013 Vibrations Technical Conference RIT/VTC 2013 December 16, 2013, Rochester, NY, USA VTC2013-1 ECCENTRIC MASS DYNAMIC VIBRATION ABSORBER Timothy G. Southerton, Brian T. Grosso, Kyle J. Lasher Kate Gleason College of Engineering Department of Mechanical Engineering Rochester Institute of Technology …
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