Wyniki 1-2 spośród 2 dla zapytania: authorDesc:"Oleksiy S. LANETS"

Implementation of dual-frequency resonant vibratory machines with pulsed electromagnetic drive DOI:10.15199/48.2019.04.08

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At present, the systems with regulated modes using the control and feedback facilities are becoming more and more widespread. The implementation of such systems is very relevant problem for effective operation of vibratory machines with resonant modes. This is due to the influence of technological factors on the dynamics of their oscillatory system, in particular on its amplitude-frequency characteristic [1-4]. In order to balance this effect out, the amplitude and frequency control is used. It allows to eliminate structural inaccuracies (errors), to provide stable characteristics due to the effect of a changing load. The publications [4, 5] are devoted to solving this problem. In terms of introduction into practice, the resonant machines should be designed using an alternating current electromagnetic drive. This is due to the following factors: ─ high reliability and durability due to the lack of elements and pairs (couples) of mechanical friction; ─ simplicity of the machine starting up and stopping due to the absence of influence of the mechanical system on the drive dynamics, which is not typical for machines with an electromechanical drive using the effect of Sommerfeld [6]. Nevertheless, the vibratory resonant machines with single-frequency modes are of limited use [7]. The systems with two operation frequencies are much more effective [8- 10]. In addition to the technological advantages of dualfrequency resonant systems, it is also necessary to take into account higher dynamic stability in comparison with single-frequency systems [11]. The dual-frequency systems based on the combined ball-inertial vibrator may also be promising at the present time [8]. The proposed design allows to use the resonance mode at the same frequency due to the use of the Sommerfeld effect. However, such a vibrator has the disadvantages of the mode regulation since the changing of the harmonic amplitude value at this frequency [...]

Substantiation of consolidated inertial parameters of vibrating bunker feeder DOI:10.15199/48.2019.04.09

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Vibrating bunker feeders are commonly used to automate production processes. They are widely manufactured by different world enterprises: Spirol International Corporation, Moorfeed Corporation A Division of Executive Automation Systems Inc., NTN Corporation. [1-5]. Two main types of vibration bunker feeders can be distinguished: with directed (fig. 1) and independent (fig. 2) oscillations. In vibration bunker feeders with independent (elliptical) oscillations, the direction of throwing is provided by force disturbance at two independent coordinates. Therefore, for determining the coefficients of stiffness of elastic nodes, we use well-known expressions for the consolidated mass at rectilinear oscillations or the consolidated moment of inertia of the system at angular oscillations [6-10]. a) b) Fig. 1. Vibrating bunker feeders with guided (screw-like) oscillations in which the bowl is made cylinder-like (a) and a conical-like (b) In vibration bunker feeders with propeller oscillations, the direction of throwing is ensured due to sloping elastic elements. In such structures, the propeller movement involves two: rectilinear and angular. Therefore, in order to determine the stiffness coefficient of an elastic node on the basis of a hyperboloid torsion, it is necessary to know the consolidated mass or the summed moment of inertia at propeller-shaped oscillations, which themselves contain, respectively, the proportion of the consolidated moment of inertia of the system at angular oscillations or the consolidated mass in rectilinear oscillations [11,12,16]. Fig. 2. Vibrating bunker feeder with independent (elliptical) oscillations In the technical literature you can find methods for calculating vibration bunker feeders parameters. One of the defining parameters is the consolidated mass or the summed moment of inertia of the oscillatory system, the motion of which is carried out on a propellant trajectory. It is impossible to c[...]

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