INFLUENCE OF TEMPERATURE PROCESSES IN THE WORK OF THE LINEAR PULSE ELECTROMECHANICAL TRANSDUCER INDUCTION TYPE

2017 ◽  
Author(s):  
Vladimir F. Bolyukh ◽  
Igor I. Katkov ◽  
Sergey V. Oleksenko ◽  
Natalya V. Kryukova
Keyword(s):  
Influence Of Temperature ◽  
Electromechanical Transducer ◽  
Induction Type ◽  
Linear Pulse

Influence of the Form of Pulse of Excitation on the Speed and Power Parameters of the Linear Pulse Electromechanical Converter of the Induction Type

2019 ◽  
Author(s):  
Vladimir F. Bolyukh ◽  
Igor I. Katkov
Keyword(s):  
Experimental Studies ◽  
Excitation Pulse ◽  
Displacement Sensor ◽  
Power Device ◽  
Storage Device ◽  
Capacitive Energy Storage ◽  
Recurrent Relations ◽  
Induction Type ◽  
Linear Pulse ◽  
The Impact

Abstract Linear pulse electromechanical converters (LPEC) of induction type allow providing a high speed of the actuating element in the short active section and creating powerful power impulses with its insignificant movement. One of the ways to improve the electromechanical indicators of LPEC is the formation of current excitation pulses in the inductor using electronic power supply circuits containing a capacitive energy storage device. This publication is a continuation of our previous work on the influence of different parameters and conditions on the performance of LPEC. Using the developed chain mathematical model, recurrent relations are obtained for calculating the interconnected electromagnetic, mechanical and thermal parameters of LPEC. It has been established that the speed and power electromechanical indicators of LPEC with aperiodic excitation pulse are better than those of LPEC with unipolar excitation, but worse than those of LPEC with oscillating-damped excitation pulse. LPEC with a unipolar excitation pulse, by the end of the working cycle, the smallest temperatures of the inductor and the armature are observed, while for LPEC with a oscillating-damped excitation pulse, the greatest efficiency is ensured, being 24.88%. The highest speed and power electromechanical indicators are provided at LPEC with a step-aperiodic excitation pulse. Experimental studies of LPEC were conducted when operating as an electromechanical accelerator and a shock-power device. In studies of LPEC, a piezoelectric transducer was used as a shock-power device, which converted mechanical vibrations arising from the impact of the striker on the impact plate into electrical signals. In studies of LPEC, a displacement sensor was used as an electromechanical accelerator. It was established experimentally that the movement of the armature begins with a delay relative to the moment of occurrence of the current pulse and is almost linear in the initial part of the acceleration.

scholarly journals Influence of limiting the duration of the armature winding current on the operating indicators of a linear pulse electromechanical induction type converter

2021 ◽  
pp. 3-10
Author(s):  
V.F. Bolyukh ◽  
I.S. Shchukin
Keyword(s):  
Heating Temperature ◽  
Power Device ◽  
Maximum Efficiency ◽  
Induced Current ◽  
Efficiency Criterion ◽  
Operating Cycle ◽  
Capacitive Energy Storage ◽  
Induction Type ◽  
Linear Pulse ◽  
Solutions Of Equations

Introduction. Linear pulse electromechanical converters of induction type (LPECIT) are used in many branches of science and technology as shock-power devices and electromechanical accelerators. In them, due to the phase shift between the excitation current in the inductor winding and the induced current in the armature winding, in addition to the initial electrodynamic forces (EDF) of repulsion, subsequent EDF of attraction also arise. As a result, the operating indicators of LPECIT are reduced. The purpose of the article is to increase the performance of linear pulse electromechanical induction-type converters when operating as a shock-power device and an electromechanical accelerator by limiting the duration of the induced current in the armature winding until its polarity changes. Methodology. To analyze the electromechanical characteristics and indicators of LPECIT, a mathematical model was used, in which the solutions of equations describing interrelated electrical, magnetic, mechanical and thermal processes are presented in a recurrent form. Results. To eliminate the EDF of attraction between the LPIECIT windings, it is proposed to limit the duration of the induced current in the armature winding before changing its polarity by connecting a rectifier diode to it. It was found that when the converter operates as a shock-power device without limiting the armature winding current, the value of the EDF pulse after reaching the maximum value decreases by the end of the operating cycle. In the presence of a diode in the armature winding, the efficiency criterion, taking into account the EDF pulse, recoil force, current and heating temperature of the inductor winding, increases. When the converter operates as an electromechanical accelerator without limiting the armature winding current, the speed and efficiency decrease, taking into account the kinetic energy and voltage of the capacitive energy storage at the end of the operating cycle. In the presence of a diode in the armature winding, the efficiency criterion increases, the temperature rise of the armature winding decreases, the value of the maximum efficiency increases, reaching 16.16 %. Originality. It has been established that due to the limitation of the duration of the armature winding current, the power indicators of the LPECIT increase when operating as a shock-power device and the speed indicators when the LPECIT operates as an electromechanical accelerator. Practical value. It was found that with the help of a rectifier diode connected to the multi-turn winding of the armature, unipolarity of the current is ensured, which leads to the elimination of the EDF of attraction and an increase in the performance of the LPECIT.

Linear Electromechanical Transducer in the Systems of Welded Joints of Electrodynamic Processing

2020 ◽  
pp. 397-428
Author(s):  
Andrii Zhyltsov ◽  
Igor Kondratenko ◽  
Vyacheslav Vasyuk
Keyword(s):  
Mathematical Modeling ◽  
Welded Joints ◽  
Electrical Circuit ◽  
Geometrical Parameters ◽  
Two Dimensional ◽  
Weld Joints ◽  
Electromechanical Transducer ◽  
Coil Inductance ◽  
Induction Type ◽  
Electromechanical Transducers

This chapter is dedicated to establishing characteristics relationships between the induction type impact electromechanical transducer and parameters and quality indicators of electrodynamic effects on the welded joints. The authors developed two-dimensional circle-field mathematical model of transient discharge capacity at the branched electrical circuit with the coil inductance which changes dynamically, allowing by adjusting the parameters of the electromechanical transducer to achieve the necessary technological requirements for the characteristics of electrodynamic processing. Based on mathematical modeling of electrophysical processes in electromechanical transducers, induction type for electrodynamic processing of welded joints, reasonably geometrical parameters massive disk, and the contact area, the necessary conditions are created to reduce residual stresses in the weld joints.

MULTICRITERIAL SELECTION OF PARAMETERS OF THE EXTERNAL SCREEN OF A LINEAR PULSE ELECTROMECHANICAL TRANSDUCER

2017 ◽  
Vol 25 (101) ◽  
pp. 106-116
Author(s):  
Vladimir F., Bolyukh ◽  
◽  
Aleksandr, Kocherga ◽  
Igor S. Shchukin
Keyword(s):  
Electromechanical Transducer ◽  
Linear Pulse ◽  
Selection Of

scholarly journals INFLUENCE OF AN EXCITATION SOURCE ON THE POWER INDICATORS OF A LINEAR PULSE ELECTROMECHANICAL CONVERTER OF INDUCTION TYPE

2021 ◽  
Vol 2021 (3) ◽  
pp. 28-36
Author(s):  
V.F. Bolyukh ◽  
◽  
I.S. Shchukin ◽  
◽  
◽  
...  
Keyword(s):  
Voltage Source ◽  
Capacitive Energy Storage ◽  
Maximum Value ◽  
Unipolar Pulse ◽  
Induction Type ◽  
Linear Pulse ◽  
Voltage Frequency ◽  
Power Mode ◽  
Electromechanical Converter ◽  
Alternating Voltage

The purpose of the article is to evaluate the efficiency of an induction-type linear pulse electromechanical converter (LPEC) when operating in shock-power mode and excitation from an alternating voltage source (AVS) in comparison with excitation from a capacitive energy storage (CES). A mathematical model of an induction-type LPEC has been developed both when excited by a unipolar pulse from a CES and from an AVS using lumped parameters of the windings, which takes into account the interrelated electromagnetic, mechanical and thermal processes. It has been found that when the LPEC is excited from the AVS with a voltage frequency of 50 Hz, the electrodynamic force takes on a periodic decaying character with a significant prevalence of positive components of forces over negative ones. The maximum value of the force is much less, and the value of its impulse is much greater than in the LPEC, excited from the CES. With an increase in the frequency of the AVS voltage from 50 to 150 Hz, the highest value of the current density of the inductor winding decreases, and in the armature winding it increases. The greatest values of force and impulse of force are realized at a voltage frequency of 150 Hz. With an increase in the AVS frequency, the relative indicator of the efficiency of the LPEC increases. References 15, figures 4.

The effect of temperature on high-resolution TEM image contrast

1995 ◽  
Vol 53 ◽  
pp. 640-641
Author(s):  
T. Geipel ◽  
W. Mader ◽  
P. Pirouz
Keyword(s):  
Form Factor ◽  
Inelastic Scattering ◽  
Accurate Method ◽  
Waller Factor ◽  
Effect Of Temperature ◽  
Specimen Thickness ◽  
Influence Of Temperature ◽  
Debye Waller Factor ◽  
Influence Of Temperature On ◽  
Atomic Form Factor

Temperature affects both elastic and inelastic scattering of electrons in a crystal. The Debye-Waller factor, B, describes the influence of temperature on the elastic scattering of electrons, whereas the imaginary part of the (complex) atomic form factor, fc = fr + ifi, describes the influence of temperature on the inelastic scattering of electrons (i.e. absorption). In HRTEM simulations, two possible ways to include absorption are: (i) an approximate method in which absorption is described by a phenomenological constant, μ, i.e. fi; - μfr, with the real part of the atomic form factor, fr, obtained from Hartree-Fock calculations, (ii) a more accurate method in which the absorptive components, fi of the atomic form factor are explicitly calculated. In this contribution, the inclusion of both the Debye-Waller factor and absorption on HRTEM images of a (Oll)-oriented GaAs crystal are presented (using the EMS software.Fig. 1 shows the the amplitudes and phases of the dominant 111 beams as a function of the specimen thickness, t, for the cases when μ = 0 (i.e. no absorption, solid line) and μ = 0.1 (with absorption, dashed line).

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