scholarly journals PERFORMANCE OF A TABLE STRUCTURE OF AN ELECTROMAGNETIC VIBRATION EXCITER

1955 ◽  
Author(s):  
A J Beck
Keyword(s):  
Vibration Exciter ◽  
Electromagnetic Vibration

A Resonant Electromagnetic Vibration Exciter of Oscillations with a Feedback

Vestnik MEI ◽  
2020 ◽  
Vol 1 (1) ◽  
pp. 62-66
Author(s):  
Mukhtorkhan Ibadullaev ◽  
◽  
Almikhan K. Nuraliev ◽  
Azamat Zh. Esenbekov ◽  
Alisher Zh. Nazarov ◽  
...  
Keyword(s):  
Vibration Exciter ◽  
Electromagnetic Vibration

Schwingungsanalyse an Industrierobotern*/Vibration analysis of industrial robots

2019 ◽  
Vol 109 (09) ◽  
pp. 656-661
Author(s):  
A. Karim ◽  
C. Michalkowski ◽  
A. Lechler ◽  
A. Verl
Keyword(s):  
Modal Analysis ◽  
Active Control ◽  
Normal Mode ◽  
Vibration Analysis ◽  
Industrial Robots ◽  
Vibration Exciter ◽  
Dynamic Vibration ◽  
Vibration Behavior ◽  
Working Space ◽  
Electromagnetic Vibration

Dieser Beitrag untersucht experimentell das dynamische Schwingverhalten eines „KR-500–3 MT“ von Kuka mittels eines elektromagnetischen Schwingerregers (Shaker) an insgesamt 28 Messposen im Arbeitsraum. Diese Untersuchungsmethode ist neuartig, da die Ergebnisse mit einer Modalanalyse mit Impulshammeranregung verglichen werden. Ab der vierten Eigenmode entstehen Unterschiede aufgrund der Anregungsform. Zudem wird an jeder Pose eine Messung mit angezogener Motorbremse und eine mit aktiver Regelung durchgeführt und miteinander verglichen.   This paper explores experimentally the dynamic vibration behavior of a Kuka KR-500 MT, using an electromagnetic vibration exciter (shaker) on a total of 28 measuring poses in the working space. As such studies are not known, the results are compared to a modal analysis with impulse hammer excitation. Starting from the fourth normal mode, differences arise due to the form of excitation. Both measurements are performed and compared with each other on each pose with brakes applied as well as with active control.

RESEARCH Of THE INFLUENCE OF LONG-LASTING CYCLIC LOADING ON THE GEOMETRY OF THE BUMP FOIL OF A GAS FOIL BEARING

Tribologia ◽  
2019 ◽  
Vol 284 (2) ◽  
pp. 5-13
Author(s):  
Paweł Bagiński ◽  
Grzegorz Żywica
Keyword(s):  
Heat Treating ◽  
Inconel 625 ◽  
Vibration Exciter ◽  
Foil Bearings ◽  
Contact Points ◽  
Electromagnetic Vibration ◽  
Foil Bearing ◽  
Measurement Series ◽  
Before And After ◽  
The Individual

The article describes the research aimed at checking the effect of a long-lasting pulsating load on the geometry of the bump foil of a foil bearing. The tested foil was made of Inconel 625, which is one of the most popular alloys used to manufacture components of foil bearings. The foil was tested both before and after its heat treating in an electric furnace. The foil was subjected to loading using an electromagnetic vibration exciter, whose exciting force and frequency were appropriately selected. The height of the individual bumps of the foil was the basic parameter controlled after each measurement series. In addition, wear of the foil at the contact points with the plates of the test rig was checked. The materials of which the elements of the tested system were made are the same as the ones used in a real bearing. The article presents graphs that show how the geometry of the bump foil changed during the research. The wear of the elements mating with the bump foil was also evaluated.

scholarly journals ABOUT OF THE DYNAMICS OF FORCED OSCILLATIONS IN NONLINEAR SYSTEMS

2019 ◽  
Author(s):  
A. N. Qurbanov ◽  
I. Z. Sardarova
Keyword(s):  
Nonlinear System ◽  
Harmonic Balance ◽  
Initial Conditions ◽  
Forced Oscillations ◽  
Dynamic Mode ◽  
Vibration Exciter ◽  
Balance Equations ◽  
Mechanical Part ◽  
Cyclic Mode ◽  
Electromagnetic Vibration

The article discusses the issues of determining the effectiveness indicators of an electromagnetic vibration exciter in a dynamic mode of operation. It is established that this system is whole system of electrical and mechanical circuits. In this case, the mechanical part operates in the mode of forced vibrations. The oscillation parameters of the system, such as amplitude, frequency, and phase, largely depend on the parameters of the system load. For the analysis of this system, differential equations describing an electromagnetic vibration exciter have been compiled. For this purpose, the dependence L(x) of the inductance on the displacement is used. The dynamic modes of one of the ways of asynchronous excitation of an electromagnetic vibration exciter are investigated. The accuracy analysis and the evaluation of the results were performed by the Fisher criterion for the regression model. To analysis of transients in the electromagnetic vibration exciter, were used the software packages WinFact and MatLab to simulate and optimize dynamic systems. It is established that the system, depending on the initial conditions in the simulation, goes into one of two very different modes. In this case, the initial zero conditions switch the system into a “cyclic” mode, and in other, non-zero conditions, the system goes into an approximate cyclic mode, characterized by a higher speed of movement of the anchor. The parameters of the steady state cyclic movement are determined by the method of harmonic balance. The obtained results allow us to describe autoparametric oscillations of the electric equivalent circuit. It has been established that the compilation of harmonic balance equations corresponding to a linear system helps simplify the solution of the task of determining the dynamics of forced oscillations. The expressions for determining the tractive force and the current flowing through the circuit are obtained, the wavelet spectra of vibration are constructed using the MatLab software package. As a result, for the mechanical part of a nonlinear system, in fact, it is necessary to solve only harmonic balance equation. The results show that this theoretical model allows a more qualitative and accurate assessment of the observed phenomenon. Based on this, the asymptotic conditions for solving the harmonic balance equations of a nonlinear system are determined. The expressions for the electromagnetic force acting on the anchor are obtained, the conditions for the harmonic balance of the mechanical part of the system are determined. The expressions obtained allow us to construct the amplitude-frequency characteristics of the electromagnetic vibration exciter. In conclusion, not only qualitative, but also quantitative estimates of the observed phenomena were obtained. It has been established that mechanical oscillations of a nonlinear system are insensitive to changes in the supply network and practically have a large amplitude with a constant frequency.

scholarly journals On the energy efficiency of electromechanical systems with an electromagnetic vibration exciter

2020 ◽  
Vol 216 ◽  
pp. 01108
Author(s):  
А. К. Nuraliev ◽  
T. Amirov ◽  
А.J. Esenbekov
Keyword(s):  
Energy Efficiency ◽  
Electric Power ◽  
High Reliability ◽  
Vibration Exciter ◽  
Production Lines ◽  
Electromechanical Systems ◽  
Electromagnetic Vibration ◽  
Magnetic Chain ◽  
Wide Range ◽  
Wide Circle

Study shake the phenomena in the electromechanical systems (EMS) are presented by permanent interest for the wide circle of researchers. The most effective source of vibrations in many cases is an electromagnetic causative vibration exciters (EMCV) in that there is transformation of electric power to energy of mechanical vibrations, that is related to the change of inductance. Electromagnetic vibration exciters have a number of significant advantages over other types of exciters. Due to the absence of rubbing parts they have high reliability and durability. They allow you to smoothly adjust the amplitude of vibrations over a wide range. EMCV are easy to integrate into production lines, they have easy maintenance, low operating costs and extensive automation capabilities. This phenomenon presents interest at development of electromechanics devices for intensive vibrotechnologies. Especially development guided on frequency of resonant EMCV promotes the economy of consumption of electric power and productivity of vibrotechnique. To the article the results of theoretical and experimental researches are driven on the increase of energy efficiency of EMCV and determination of output-input ratio. It is shown that losses of electric power in EMS with EMCV related to the origin of permanent constituents and ultra-harmonics of current, choice of magnetic chain and dynamic.

scholarly journals INVESTIGATION OF AN ELECTROMAGNETIC TWO-STROKE VIBRATING ACTIVATOR IN OSCILLATORY MODE

2020 ◽  
Vol 2020 (2) ◽  
pp. 57-63
Author(s):  
A Rakhmatullayev ◽  
◽  
K Abidov
Keyword(s):  
Maxwell Equation ◽  
Input Voltage ◽  
Electrical Circuit ◽  
Oscillatory Mode ◽  
Vibration Exciter ◽  
Electromagnetic Vibration ◽  
Output Amplitude

The article considers the results of the study of electromagnetic vibration exciter with sequentially included capacitor in the electrical circuit, consisting of mechanical and electrical subsystems. It is shown that by means of the Lagrangian-Maxwell equation the interconnection between mechanical and electric subsystems can be realized. The relations describing processes of establishment of amplitudes and phases of oscillations both in mechanical and in electric subsystems are deduced. The equations connecting the output (amplitude) of vibration of the vibrating exciter with its input (voltage) of the network are presented. As a result, the formulas allowing making corrections at the solution of the system describing operation of the electromagnetic vibrating exciter in two-stroke mode are presented.

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