Wyniki wyszukiwania - BazTech

1

Analysis of power and energy parameters of the conveyor infrared dryer of oil-containing raw materials

Palamarchuk Igor, Paziuk Vadim, Palamarchuk Vladyslav, Hulevych Ruslan, Kalizhanova Aliya, Sarsembayev Magzhan

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska

|

2023

|

T. 13, nr 2

10--14

EN

Infrared drying of bulk agricultural products is becoming increasingly widespread in processing and food industries due to energy efficiency, compactness of technological equipment, and ease of operation. The purpose of the presented research is to determine the influence of the technological parameters of the process of infrared drying of the moving layer of oil-containing raw materials. An experimental model of a vibro-conveyor dryer and a set of measuring equipment were developed to solve the problems. The scientific novelty of the work is the confirmation that in the conditions of a vibro-liquefied layer of products, unique conditions are created for the constant renewal of heat exchange surfaces and, accordingly, the leveling of the negative thermal radiation effect on the products, the possibility of advancing the product layer along the working zone, reducing the forces of internal friction in the technological mass, which leads to a decrease in energy consumption on the process Laws have been established regarding the effect of the number of thermoradiation blocks, the load on the flexible belt of the wave conveyor, the speed of product advancement on the belt on the dynamics of infrared drying of soybeans and rapeseed. The practical value of the work was the substantiation of the operating modes of thermoradiation drying with the help of a vibrating wave conveyor installation based on the energy saving of the technological impact, high intensification of the process and minimization of the negative effect on the properties of the processed products.

PL

Suszenie podczerwienią produktów rolnych luzem staje się coraz bardziej powszechne w przemyśle przetwórczym i spożywczym ze względu na energooszczędność, kompaktowość urządzeń technologicznych i łatwość obsługi. Celem prezentowanych badań jest określenie wpływu parametrów technologicznych procesu suszenia podczerwienią ruchomej warstwy surowców zawierających olej. W celu rozwiązania problemów opracowano eksperymentalny model suszarki z przenośnikiem wibracyjnym oraz zestaw urządzeń pomiarowych. Naukową nowością pracy jest potwierdzenie, że w warunkach skraplania wibracyjnego warstwy produktów powstają unikalne warunki do ciągłego odnawiania powierzchni wymiany ciepła, a tym samym niwelowania negatywnego wpływu promieniowania cieplnego na produkty, możliwość przesuwania warstwy produktu wzdłuż strefy roboczej, Zmniejszenie sił tarcia wewnętrznego w masie technologicznej, co prowadzi do zmniejszenia zużycia energii w procesie. Zdefiniowano prawa dotyczące wpływu liczby bloków termoradiacyjnych, obciążenia elastycznej taśmy przenośnika falowego, prędkości przesuwania produktu na taśmie na dynamikę suszenia soi i rzepaku w podczerwieni. Praktyczną wartością pracy było uzasadnienie trybów pracy suszenia termoradiacyjnego za pomocą instalacji przenośnika wibracyjno-falowego w oparciu o oszczędność energii oddziaływania technologicznego, wysoką intensyfikację procesu i minimalizację negatywnego wpływu na właściwości przetwarzanych produktów.

2

Damping low-frequency oscillations in a multi-machine power system using a fuzzy-multi-band power system stabilizer

Essallah Sirine, Khedher Adel

Journal of Power Technologies

|

2022

|

Vol. 102, nr 4

140--148

EN

Synchronous generators are usually eguipped with power system stabilizers (PSS) to damp low-freguency oscillations. Among the various types of PSS, it has recently been demonstrated that the Multi-Band PSS (MB-PSS) has a better performance to handle all global, inter-area and local modes. However, the performance of this PSS may degrade since the power supply system is intrinsically non-linear and its operating conditions freguently change. This paper introduces a new design of MB-PSS based on Mamdani Fuzzy inference (Fuzzy-MB-PSS). Compared to the IEEE standard MB-PSS, the proposed stabilizer is more efficient owing to its ability to deal with oscillations at different operating points. The controller is tested on a power system benchmark under various disturbance conditions to prove its robustness and to demonstrate its superiority over conventional PSS and MB-PSS.

3

Understanding the interplay between baroreflex gain, low frequency oscillations, and pulsatility in the neural baroreflex

Ringwood John V., Bagnall-Hare Hasana

Biocybernetics and Biomedical Engineering

|

2020

|

Vol. 40, no. 3

1291--1303

EN

The neural baroreflex, which regulates mean arterial pressure (MAP) via the action of the brain, consists of baroreceptors which measure MAP, and actuators that can produce a change in MAP, such as the heart and parts of the peripheral resistance containing innervated smooth muscle. The brain is the controlling unit, maintaining an appropriate MAP in spite of various disturbances. Under certain circumstances, including haemorrhage and other states of distress, the gain of the neural baroreflex can change, causing low frequency (LF) oscillations (sometimes termed Mayer waves) in blood pressure (BP). Though their purpose is unclear, the origins of these LF oscillations has previously been explained via a nonlinear feedback model, though focusing on the peripheral resistance as an MAP actuator only. The present paper now includes analytical and simulation results explaining the LF oscillation phenomenon for the full neural baroreflex, containing both peripheral resistance (PR) and cardiac branches. However, the main contribution of the paper is to examine the effect of blood pulsatility, or a lack of pulsatility, on the neural baroreflex, and how it's effect can manifest in the presence of LF oscillations. This may have importance in cases where pulsatility is reduced (for example where left-ventricular assist devices are present), or completely absent (for example in turbine-based artificial hearts).

4

Monitoring of operational parameters of interconnected power systems

Kyrylenko O., Butkevych O., Chyzhevskyi V.

Przegląd Elektrotechniczny

|

2012

|

R. 88, nr 3a

25-27

EN

One approach to the detection of the threat to Interconnected power systems’ stability in the form of oscillatory instability is presented. The instability threat can be detected in real time by contemporary monitoring of subsystems and the use of the proper data processing procedures.

PL

Przedstawiono procedurę wykrywania zagrożeń niestabilności złożonych systemów elektroenergetycznych. Oscylacje o małej częstotliwości związane z oscylacjami występującymi w grupach generatorów mogą prowadzić do niestabilności systemu. Pokazano, że tendencja do niestabilności może być wykrywana w czasie rzeczywistym przez odpowiednie monitorowanie systemu.

5

Mechatronowa technologia montażu ze wzbudzaniem w połączeniach mikrodrgań o małej częstotliwości i dokładnym ukierunkowaniu

Nikołajew W.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

|

2008

|

z. 72 [251]

59-65

EN

Technological dimensional chains identifying separate stages of the robot-based assembly process have been found. Allowance constraints specified for the dimensions of the structure's elements have been schematically represented The necessity to initially identify errors in the parts to be put together and then automatically correct the kinematic and force parameters of the motion has been shown. Requirements to the exactitude of repeating the movements assigned to provide quality assembly have been identified. Excitation of low-frequency oscillations in the joint structures has proved to allow both initiation of events occurring in real units and control under present conditions. Application of the developed mechatronic assembly technology has been considered.

6

Theoretical analysis of the influence of the power supply on breathing oscillations in Hall thrusters

Barral S.

Journal of Technical Physics

|

2008

|

Vol. 49, no 3-4

177-185

EN

The breathing mode is the best known low-frequency longitudinal bulk instability of Hall thrusters, capable of generating very wide, regular discharge current oscillations in the 10-30 kHz range. This study extends a recent theory of breathing mode oscillations to the case of a non-ideal voltage source. A simple equivalent circuit modeling the AC behavior of the thruster is derived, using R, L and C components. The equivalent circuit explains in a straightforward way why an impedance in series with the generator is usually able to damp oscillations. More generally, the derived equivalent circuit can be expected to greatly improve the understanding of interactions between the thruster and the power processing unit, and in turn to help the design of robust filters.