73 research outputs found
DC-assisted microwave quenching of YBa2Cu3O7-{\delta} coplanar waveguide to a highly dissipative state
The paper reports on finding the effect of a strong change in the microwave
losses in an HTS-based coplanar waveguide (CPW) at certain values of the input
power Pin and direct current Idc. CPW on the basis of 150 nm thick
YBa2Cu3O7-{\delta} epitaxial film on a single crystal MgO substrate was studied
experimentally. A sharp and reversible transition of the CPW into a strongly
dissipative state at the certain meanings of Pin and Idc depending on
temperature was observed. Apparently the effect can be explained by
self-heating of HTS structure caused by magnetic flux flow under the joint
influence of MW and DC.Comment: 9 pages, 5 figures, 17 reference
An oscillograms processing algorithm of a high power transformer on the basis of experimental data
The paper presents the studies on digital processing of oscillograms of the power transformer operation allowing determining the state of its windings of different types and degrees of damage. The study was carried out according to the authors' own methods using the Fourier analysis and the developed program based on the following application software packages: MathCAD and Lab View. The efficiency of the algorithm was demonstrated by the example of the waveform non-defective and defective transformers on the basis of the method of nanosecond pulses
Development of advanced technology for high voltage transformer winding condition control based on probing impulse of nanosecond duration
The paper deals with the experimental research of the pulsed method of transformer winding control in comparison with FRA technology. A new approach to winding condition control technology is described. The proposed method is based on short (compared with a typical pulsed technology) probe pulse and front pulse durations. The experimental results of sensitivity growth at decreasing front pulse duration are shown. The experimental equipment and measurements are described. A comparison of the experimental results of the proposed technology and FRA is given. It is shown that shorter front of probe pulse duration allows upgrading sensitivity of the diagnostic procedure
Π‘ΠΠΠΠ£ΠΠ―Π ΠΠ«Π ΠΠΠΠΠ£Π©ΠΠΠΠ― Π ΠΠΠΠΠΠΠ-ΠΠΠΠΠ ΠΠ’ΠΠ§ΠΠΠ ΠΠΠΠΠ§Π ΠΠΠ’ΠΠΠΠΠ¬ΠΠΠΠ Π£ΠΠ ΠΠΠΠΠΠΠ―
The control problem for a linear singularly perturbed system with minimum energy is under consideration. The final state of the system and the transition time are assumed to be given. Asymptotic approximations to the optimal open-loop and optimal feedback controls for this problem are constructed. The main advantage of the proposed algorithms is that the original optimal control problem is split into two unperturbed problem of smaller dimension.Π Π°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°Π΅ΡΡΡ Π·Π°Π΄Π°ΡΠ° ΠΎΠ± ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΠΈ Ρ ΠΌΠΈΠ½ΠΈΠΌΠ°Π»ΡΠ½ΠΎΠΉ ΡΠ½Π΅ΡΠ³ΠΈΠ΅ΠΉ Π»ΠΈΠ½Π΅ΠΉΠ½ΠΎΠΉ ΡΠΈΠ½Π³ΡΠ»ΡΡΠ½ΠΎ Π²ΠΎΠ·ΠΌΡΡΠ΅Π½Π½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΠΎΠΉ. ΠΠΎΠ½Π΅ΡΠ½ΠΎΠ΅ ΡΠΎΡΡΠΎΡΠ½ΠΈΠ΅ ΡΠΈΡΡΠ΅ΠΌΡ ΠΈ Π²ΡΠ΅ΠΌΡ ΠΏΠ΅ΡΠ΅Ρ
ΠΎΠ΄Π° ΡΡΠΈΡΠ°ΡΡΡΡ Π·Π°Π΄Π°Π½Π½ΡΠΌΠΈ. Π‘ΡΡΠΎΡΡΡΡ Π°ΡΠΈΠΌΠΏΡΠΎΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΏΡΠΈΠ±Π»ΠΈΠΆΠ΅Π½ΠΈΡΒ ΠΊ ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΠΎΠΌΡ ΠΏΡΠΎΠ³ΡΠ°ΠΌΠΌΠ½ΠΎΠΌΡ ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ ΠΈ ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΠΎΠΉ ΠΎΠ±ΡΠ°ΡΠ½ΠΎΠΉ ΡΠ²ΡΠ·ΠΈ Π² ΡΡΠΎΠΉ Π·Π°Π΄Π°ΡΠ΅. ΠΡΠ½ΠΎΠ²Π½ΠΎΠ΅ Π΄ΠΎΡΡΠΎΠΈΠ½ΡΡΠ²ΠΎ ΠΏΡΠ΅Π΄Π»Π°Π³Π°Π΅ΠΌΡΡ
Π°Π»Π³ΠΎΡΠΈΡΠΌΠΎΠ² ΡΠΎΡΡΠΎΠΈΡ Π² ΡΠΎΠΌ, ΡΡΠΎ ΠΏΡΠΈ ΠΈΡ
ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠΈ ΠΈΡΡ
ΠΎΠ΄Π½Π°Ρ Π·Π°Π΄Π°ΡΠ° ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ ΡΠ°ΡΠΏΠ°Π΄Π°Π΅ΡΡΡ Π½Π° Π΄Π²Π΅ Π½Π΅Π²ΠΎΠ·ΠΌΡΡΠ΅Π½Π½ΡΠ΅ Π·Π°Π΄Π°ΡΠΈ ΠΌΠ΅Π½ΡΡΠ΅ΠΉ ΡΠ°Π·ΠΌΠ΅ΡΠ½ΠΎΡΡΠΈ
ΠΡΠΈΠΌΠΏΡΠΎΡΠΈΡΠ΅ΡΠΊΠΈΠΉ ΠΌΠ΅ΡΠΎΠ΄ ΠΌΠΈΠ½ΠΈΠΌΠΈΠ·Π°ΡΠΈΠΈ ΠΈΠ½ΡΠ΅Π³ΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΊΠ²Π°Π΄ΡΠ°ΡΠΈΡΠ½ΠΎΠ³ΠΎ ΡΡΠ½ΠΊΡΠΈΠΎΠ½Π°Π»Π° Π½Π° ΡΡΠ°Π΅ΠΊΡΠΎΡΠΈΡΡ ΠΊΠ²Π°Π·ΠΈΠ»ΠΈΠ½Π΅ΠΉΠ½ΠΎΠΉ Π΄ΠΈΠ½Π°ΠΌΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΡ
The problem of minimizing the integral quadratic functional on the trajectories of a quasilinear dynamical system with linear terminal constraints is under consideration. Asymptotic approximations to the optimal open-loop and optimal feedback controls for this problem are constructed.Β Communicated by Corresponding Member Valentine V. GorokhovikΠ Π°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°Π΅ΡΡΡ Π·Π°Π΄Π°ΡΠ° ΠΌΠΈΠ½ΠΈΠΌΠΈΠ·Π°ΡΠΈΠΈ ΠΈΠ½ΡΠ΅Π³ΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΊΠ²Π°Π΄ΡΠ°ΡΠΈΡΠ½ΠΎΠ³ΠΎ ΡΡΠ½ΠΊΡΠΈΠΎΠ½Π°Π»Π° Π½Π° ΡΡΠ°Π΅ΠΊΡΠΎΡΠΈΡΡ
ΠΊΠ²Π°Π·ΠΈΠ»ΠΈΠ½Π΅ΠΉΠ½ΠΎΠΉ Π΄ΠΈΠ½Π°ΠΌΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΡ Ρ Π»ΠΈΠ½Π΅ΠΉΠ½ΡΠΌΠΈ ΡΠ΅ΡΠΌΠΈΠ½Π°Π»ΡΠ½ΡΠΌΠΈ ΠΎΠ³ΡΠ°Π½ΠΈΡΠ΅Π½ΠΈΡΠΌΠΈ. Π‘ΡΡΠΎΡΡΡΡ Π°ΡΠΈΠΌΠΏΡΠΎΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΏΡΠΈΠ±Π»ΠΈΠΆΠ΅Π½ΠΈΡ ΠΊ ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΠΎΠΌΡ ΠΏΡΠΎΠ³ΡΠ°ΠΌΠΌΠ½ΠΎΠΌΡ ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ ΠΈ ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΠΎΠΉ ΠΎΠ±ΡΠ°ΡΠ½ΠΎΠΉ ΡΠ²ΡΠ·ΠΈ Π² ΡΡΠΎΠΉ Π·Π°Π΄Π°ΡΠ΅.ΠΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½ΠΎ ΡΠ»Π΅Π½ΠΎΠΌ-ΠΊΠΎΡΡΠ΅ΡΠΏΠΎΠ½Π΄Π΅Π½ΡΠΎΠΌ Π. Π. ΠΠΎΡΠΎΡ
ΠΎΠ²ΠΈΠΊΠΎ
ΠΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ ΠΌΠ΅ΡΠΎΠ΄Π° Π²ΠΎΠ·ΠΌΡΡΠ΅Π½ΠΈΠΉ ΠΊ Π·Π°Π΄Π°ΡΠ΅ ΠΎΠΏΡΠΈΠΌΠΈΠ·Π°ΡΠΈΠΈ ΠΏΠ΅ΡΠ΅Ρ ΠΎΠ΄Π½ΠΎΠ³ΠΎ ΠΏΡΠΎΡΠ΅ΡΡΠ° Π² ΠΊΠ²Π°Π·ΠΈΠ»ΠΈΠ½Π΅ΠΉΠ½ΠΎΠΉ Π΄ΠΈΠ½Π°ΠΌΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΠ΅
The problem of optimizing the transient process in a quasi-linear dynamic system with a performance index, being a linear combination of the energy costs and the process duration, is considered. Asymptotic approximations of a given order to the solution of this problem are constructed.Π Π°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°Π΅ΡΡΡ Π·Π°Π΄Π°ΡΠ° ΠΎΠΏΡΠΈΠΌΠΈΠ·Π°ΡΠΈΠΈ ΠΏΠ΅ΡΠ΅Ρ
ΠΎΠ΄Π½ΠΎΠ³ΠΎ ΠΏΡΠΎΡΠ΅ΡΡΠ° Π² ΠΊΠ²Π°Π·ΠΈΠ»ΠΈΠ½Π΅ΠΉΠ½ΠΎΠΉ Π΄ΠΈΠ½Π°ΠΌΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΠ΅ Ρ ΠΊΡΠΈΡΠ΅ΡΠΈΠ΅ΠΌ ΠΊΠ°ΡΠ΅ΡΡΠ²Π°, ΠΊΠΎΡΠΎΡΡΠΉ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»ΡΠ΅Ρ ΡΠΎΠ±ΠΎΠΉ Π»ΠΈΠ½Π΅ΠΉΠ½ΡΡ ΠΊΠΎΠΌΠ±ΠΈΠ½Π°ΡΠΈΡ ΡΠ½Π΅ΡΠ³Π΅ΡΠΈΡΠ΅ΡΠΊΠΈΡ
Π·Π°ΡΡΠ°Ρ ΠΈ Π΄Π»ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΠΈ ΠΏΡΠΎΡΠ΅ΡΡΠ°. Π‘ΡΡΠΎΡΡΡΡ Π°ΡΠΈΠΌΠΏΡΠΎΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΏΡΠΈΠ±Π»ΠΈΠΆΠ΅Π½ΠΈΡ Π·Π°Π΄Π°Π½Π½ΠΎΠ³ΠΎ ΠΏΠΎΡΡΠ΄ΠΊΠ° ΠΊ ΡΠ΅ΡΠ΅Π½ΠΈΡ ΡΡΠΎΠΉ Π·Π°Π΄Π°ΡΠΈ
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