Wyniki 1-2 spośród 2 dla zapytania: authorDesc:"Vladimir N. SOBOL"

Dynamical processes simulation of unbalanced vibration devices with eccentric rotor and induction electric drive DOI:10.15199/48.2019.04.14

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A using of vibration technologies allows intensify production processes, improve the work quality, create materials with new properties, reduce the material and energy intensities of equipments [1]. Vibration machines on elastic supports with an eccentric rotor, unbalances and an induction electric drive have several advantages. The constructions of such mechanisms are simple, but their motion parameters can be determined only by dynamic analysis, since the devices perform oscillations [1, 2]. Additional difficulties are caused with correct description of the dynamic feature of an induction motor (IM) at transient modes and a load with oscillating character [3]. Investigations of dynamical processes simulation, parameters choice, predictions of technological qualities for devices are very significant and urgency. At present, mathematical models of vibration devices are not sufficiently developed. In the papers [4, 5], the motion equations of the simplest mechanism model are obtained at steady-state operating modes and under the assumption that a working chamber performs translational motion. However, in most cases the translational motion conditions are not met. In addition, frequent starts and stops of devices are the characteristic modes of its operations, so the calculations of transient processes are very relevant. The cheap and easy-to-use IM generates additional difficulties associated with the description of its dynamic features at transient modes and a load with oscillating character. The using of linearized static characteristics [6], or linearized differential equations [7], which approximately describe electromagnetic transient processes in electric motors, leads to a significant overestimating of the calculated torque of IM compared with the experimental one [3]. An absence of reliable mathematical models makes it difficult: a choice of motors that provide start-up of devices; a parameters determining of the w[...]

Dynamical processes simulation of vibrational mounting devices and synthesis of their parameters DOI:10.15199/48.2019.04.15

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The problem of assembly automating by using of robots (manipulators) for increasing labor productivity, releasing hands, improving the work quality, as well as performing hazardous for health, physically heavy and monotonous work is actual for different industries. One of the promising directions in this problem solving is the use of uncontrolled, in particular, vibrational assembled devices. It’s using allow to abandon expensive sensors and servo drives at the assembly process even for non-axisymmetric parts without chamfers, does not impose high demands on the rigidity of the entire robot design. The assembly is as follows. The robot gripper "roughly" brings the assembling part, which is installed in the grab of the vibrational assembling device, to the connection point with another part (for example, a plunger to the plunger barrel). The assembling device is turn on, the part with the grab starts to do some spatial oscillations, and the parts are mated, even though the position of the assembling part was initially inaccurate. Spatial oscillations of the grab and parts are given by an unbalanced motor, which mounted on the assembling device. In Fig. 1 shows the assembly device with a vibrational mounting mechanism. In paper [1] mathematical models of devices for robots with low-frequency vibrations were created. Paper [2] is proposed the algorithms developments for the functioning of assembly mechanisms in shipbuilding. Paper [3] is devoted to dynamic processes simulation at starting process of vibrational mechanisms. Features of sensors and servo drive using are analyzed in paper [4], adaptive automatic grabs are considered in [5, 6]. An analysis of the design features of vibrational mounting devices is given in paper [7]. The simplest methods of parameters choosing for mechanisms are also presented there. Dynamic processes simulation in some devices with unbalanced vibro drives is devoted papers [8, 9], electroma[...]

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