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Number of results: 11
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Abstract

In the paper, the authors discuss the possibility to apply the "Nodalised Beam" method for vibroinsulation of manually operated tools. They indicate the difficulties in applying the original method for this purpose. On the bases of the reciprocity principle, the authors propose a method for modifying the system that allows them to avoid the mentioned disadvantages. Equations derived for the modified system that makes it possible to define the position of nodal points. The relations were verified at a test station. Furthermore, a method of tuning the system was proposed.
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Authors and Affiliations

Leszek Majkut
Jerzy Michalczyk
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Abstract

The problem of transmitting vibrations with audible frequencies by steel springs, constituting the vibration isolation system was considered in this paper. The analytical relationships allowing determining the value of the transmissibility for the springs resonance frequencies responsible for the transmissibility of high frequency vibrations have been derived and checked by means of FEM method. Also the occurrence of the increasing stresses in the springs in the areas between the resonances has been shown. The typical system, i.e. the serial system with rubber cushion, has been analyzed, reducing the transmission of high frequency vibrations by the spring. It has been shown that the transmission is reduced not as a result of differences in the wave impedance of the boundary of both media but due to the increased dispersion of energy in the rubber, and the analytical relationships allowing the evaluation of the effectiveness of this method have been derived.
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Authors and Affiliations

Jerzy Michalczyk
Leszek Majkut
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Abstract

The paper discusses an occurrence or latent reactions in the direction perpendicular to the movement of the suspension systems in vibratory machines supported by parallel leaf springs. These reactions occur despite an apparent lack of any forces acting in that direction and may - for long machine bodies - reach values comparable with the exciting force of the vibrator. Analytical relationships allowing for estimation of the value of reactions were derived. The obtained results were verified by means of the Geometric Element Method as well as by the performed experiments.
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Authors and Affiliations

Jerzy Michalczyk
Piotr Czubak
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Abstract

The hereby paper is devoted to the analysis of operational properties of vibratory conveyors, which principle of operations is based on the Frahm’s dynamic elimination effect (Den Hartog, 1971). These conveyors, according to the data given by their producers have several advantages, among others, higher vibrations amplitudes at the same drive and exceptionally low dynamic forces transmitted to the foundation. The simulation model of such conveyor loaded with a feed was created in this work and investigations of the transport efficiency and forces transmitted to the foundation at stationary states as well as at start up and coasting periods were performed. Analytical tests of vibrations during unsteady motion periods were also performed and the method of determining maximum amplitudes of conveyors in the transient resonance during coasting was proposed. The research results indicate the possibility of a wide application of this type of machines in loose materials handling in various industry branches.
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Authors and Affiliations

Jerzy Michalczyk
Marek Gajowy
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Abstract

The critical phases of starting of over-resonance vibratory machines were analysed and the strategy of overcoming those phases by low-power engines was proposed in the paper. The variational method based on the Pontriagin's maximum principle as well as method of phase angle modulation was applied. Effectiveness of the proposed solutions was investigated by the numerical simulation.
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Authors and Affiliations

Jerzy Michalczyk
Grzegorz Cieplok
Łukasz Bednarski

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