60 research outputs found
Π Π°Π·ΡΠ°Π±ΠΎΡΠΊΠ° ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ² ΡΠ΅ΠΏΠ»ΠΎΠ²ΠΎΠΉ Π΄Π΅ΡΠ΅ΠΊΡΠΎΡΠΊΠΎΠΏΠΈΠΈ ΠΈ Π΄Π΅ΡΠ΅ΠΊΡΠΎΠΌΠ΅ΡΡΠΈΠΈ Π°Π²ΠΈΠ°ΡΠΈΠΎΠ½Π½ΡΡ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠΎΠ²
ΠΠΈΡΡΠ΅ΡΡΠ°ΡΠΈΡ ΠΏΠΎΡΠ²ΡΡΠ΅Π½Π° ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠ΅ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ² Π΄Π΅ΡΠ΅ΠΊΡΠΎΠΌΠ΅ΡΡΠΈΠΈ Π² ΡΠ°ΠΌΠΊΠ°Ρ
ΠΈΠΌΠΏΡΠ»ΡΡΠ½ΠΎΠ³ΠΎ ΡΠ΅ΠΏΠ»ΠΎΠ²ΠΎΠ³ΠΎ ΠΊΠΎΠ½ΡΡΠΎΠ»Ρ Π°Π²ΠΈΠ°ΡΠΈΠΎΠ½Π½ΡΡ
ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠΎΠ². ΠΡΠΎΠ²Π΅Π΄ΡΠ½ ΡΡΠ°Π²Π½ΠΈΡΠ΅Π»ΡΠ½ΡΠΉ Π°Π½Π°Π»ΠΈΠ· ΡΡΡΠ΅ΡΡΠ²ΡΡΡΠΈΡ
ΡΠ΅ΡΠΌΠΎΠ³ΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ² ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠΉ ΠΎΡΠ΅Π½ΠΊΠΈ Π³Π»ΡΠ±ΠΈΠ½Ρ Π΄Π΅ΡΠ΅ΠΊΡΠΎΠ². ΠΡΡΠ²Π»Π΅Π½Ρ ΠΈΡ
ΠΏΡΠ΅ΠΈΠΌΡΡΠ΅ΡΡΠ²Π° ΠΈ Π½Π΅Π΄ΠΎΡΡΠ°ΡΠΊΠΈ ΠΈ ΠΎΠ±ΠΎΠ·Π½Π°ΡΠ΅Π½Ρ ΡΡΡΠ΅ΡΡΠ²ΡΡΡΠΈΠ΅ ΠΏΡΠΎΠ±Π»Π΅ΠΌΡ Π² ΡΡΠΎΠΉ ΡΡΠ΅ΡΠ΅.
ΠΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½ ΡΠ΅ΡΠΌΠΎΠ³ΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΠΉ ΠΌΠ΅ΡΠΎΠ΄ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠΉ ΠΎΡΠ΅Π½ΠΊΠΈ Π³Π»ΡΠ±ΠΈΠ½Ρ Π΄Π΅ΡΠ΅ΠΊΡΠΎΠ² Π² ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π°Ρ
, ΠΎΠ±Π»Π°Π΄Π°ΡΡΠΈΡ
ΡΠ²ΠΎΠΉΡΡΠ²ΠΎΠΌ ΠΎΠΏΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΏΠΎΠ»ΡΠΏΡΠΎΠ·ΡΠ°ΡΠ½ΠΎΡΡΠΈ. Π Π°Π·ΡΠ°Π±ΠΎΡΠ°Π½ ΠΌΠ΅ΡΠΎΠ΄ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠΉ ΠΎΡΠ΅Π½ΠΊΠΈ Π³Π»ΡΠ±ΠΈΠ½Ρ Π΄Π΅ΡΠ΅ΠΊΡΠΎΠ², Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΠ·ΡΡΡΠΈΡ
ΡΡ ΠΌΠ°Π»ΡΠΌ ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΠ΅ΠΌ ΠΏΠΎΠΏΠ΅ΡΠ΅ΡΠ½ΡΡ
ΡΠ°Π·ΠΌΠ΅ΡΠΎΠ² ΠΊ Π³Π»ΡΠ±ΠΈΠ½Π΅. Π Π°Π·ΡΠ°Π±ΠΎΡΠ°Π½ ΠΌΠ΅ΡΠΎΠ΄ ΠΎΡΠ΅Π½ΠΊΠΈ ΡΠΎΠ»ΡΠΈΠ½Ρ ΡΠΎΠ½ΠΊΠΈΡ
ΠΏΠΎΠΊΡΡΡΠΈΠΉ ΠΎΡΠ½ΠΎΠ²Π°Π½Π½ΡΠΉ Π½Π° ΠΏΠΎΡΠΎΠ³ΠΎΠ²ΠΎΠΉ ΠΎΡΡΠ΅ΡΠΊΠ΅ ΠΊΠ°ΠΆΡΡΠ΅ΠΉΡΡ ΡΠ΅ΠΏΠ»ΠΎΠ²ΠΎΠΉ ΠΈΠ½Π΅ΡΡΠΈΠΈ.This study is focused on quantitative estimation of defect depth by applying pulsed thermal nondestructive testing. A novel method for estimating defect depth is proposed by taking into account the phenomenon of 3D heat diffusion finite lateral size of defects and thermal reflection coefficient at the boundary between a host material and defects. The method is based on the combination of a known analytical model and non-linear fitting (NLF) procedure. The apparent effusivity method for the quantitative evaluation of coating thickness in a one-sided thermal NDT procedure is presented. And the depth prediction method based on neural networks is presented
Microprocessor based system for the development of control and protection of HVDC convertors.
This project investigates aspects of microprocessor based control and protection schemes for high voltage direct current convertors.
To enable this investigation to be carried out, a multiple microprocessor HVDC development system has been assembled. This provides the necessary hardware resources, as well as providing the software development facilities necessary for the implementation of real time control and protection tasks.
In order to assess and optimise the performance of the various control and protection systems, considerable interactive monitoring facilities are provided as part of the HVDC development system's software.
The development system is used to implement real time control of a small scale convertor model. It is also used to implement a new form of convertor fault detection, which is in turn used as the basis for an implementation of convertor fault development control techniques for the first time on an operating convertor.
The operation of the fault development control scheme is examined in some detail, and results are presented showing its operation over a wide variety of fault types and system conditions
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