Wyniki wyszukiwania - BazTech

1

Performance analysis of SRF PLL type-3 with dynamic feed forward frequency estimator for abnormal grid conditions

Agrawal Seema, Kumar Mahendra, Palwalia D. K.

Journal of Power Technologies

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2021

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Vol. 101, nr 2

87--95

EN

A phase-locked loop (PLL) is a closed-loop feedback control device that synchronizes its output signal with an input signal in both frequency and time. This paper presents a robust method for tracking against adverse conditions of the fundamental sequence component of utility voltage. The proposed phase-locked loop (PLL) is a hybrid configuration of the phase- locked loop type-3 (SRF type-3) synchronous reference frame coupled with a feed-forward frequency estimator using a selective harmonic filtering technique. A SRF type -2 based PLL has a secondary closed path. Under the ramp frequency transition, it has a steady-state step and a frequency error. In the proposed PLL, the constant gain loop filter is used to eliminate the phase and frequency error. Feed-forward operation with selective harmonic pre-filtering enables fast-tracking with a low tracking error of the reference signal. From the results it is evident that the proposed PLL achieves a high bandwidth and quick dynamic response without endangering the stability and filtering capability. The proposed system has been tested through MATLAB Simulink platform under abnormal conditions.

2

Use of statistical acceptance of products in the automotive industry

Dudek A.

Production Engineering Archives

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2016

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Vol. 10, No. 1

2--4

EN

The article presents the results of studies on the implementation of statistical acceptance of products with the example of a styrene-rubber plastic connector, while considering particular stages of production. The characterization of factors determining the transition from normal inspection to relaxed or tightened inspection for products made of styrene-rubber plastic materials has been made. The effect of the type of inspection on the level of non-conformance of products has been determined.

3

Experimental investigation on cutting forces, specific cutting pressure, co-efficient of friction and shear energy in turning of HSLA steel

Singaravel B., Selvaraj T.

Management and Production Engineering Review

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2016

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Vol. 7, No. 1

71--76

EN

Machinability study of a material is used to find the ease and difficulty during machining operation. High Strength Low Alloy (HSLA) medium carbon steel (EN25 steel) is considered to possess better mechanical properties than carbon steel. In this work, an attempt is made to experimentally investigate and realize the machinability of EN25 steel during turning with coated carbide tools. The effects of machining parameters on cutting force components, Specific Cutting Pressure (SCP), co-efficient of friction and shear energy are analysed during the investigation. The results of the investigation revealed that the mentioned machinability characteristics are necessary and essential to evaluate the machinability of HSLA steel effectively.

4

Chemiczne usuwanie związków ropopochodnych z wody

Piekutin J., Boruszko D., Wiater J.

Rocznik Ochrona Środowiska

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2015

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Tom 17, cz. 2

1545--1553

EN

Dispersing oil spill method is based on a interfacial tension reduction between water and oil through introduction a surfactant, so that spilled oil is changing its structure by dispersing in water. As a result of this process comes to break up oil contamination plume into smaller droplets, which is followed by its further dispersion in water. For study a 0.1% Rokrysol was used. The detergent was containing 30% of non-ionic surfactants, and 60% of anionic surfactants. In first research series the same amount of mixture and varying amounts of surfactant (SAA) were added, and in further series an established dose of the same surface active agents was added to varying amounts of crude oil. After mixing water with SPC emulsion was forming, which was decanted. The purpose of this paper was to determinate the possibilities of petroleum compounds removal from water with SAA usage.

5

Produkcja biomasy Pichia pastoris z surowców odpadowych z produkcji biodiesla

Juszczyk P., Rymowicz W., Liszka P.

Inżynieria i Aparatura Chemiczna

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2012

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Nr 4

138-140

PL

Badano zdolność drożdży Pichia pastoris ATCC 28485 do wzrostu w podłożu o zróżnicowanym pH, zawierającym jako źródło węgla surowce odpadowe z produkcji biodiesla. W hodowlach okresowych wykazano, że w podłożu z gliceryną odpadową z dodatkiem metanolu drożdże produkowały biomasę z najwyższą wydajnością (0,65 g/g) i produktywnością (1,94 g/ Lh). Stwierdzono również, że drożdże P. pastoris nie utylizowały kwasów tłuszczowych i deggumingu. Ilość białka w biomasie drożdży wahała się od 25,6 do 39,3%.

EN

The aim of this work was to examine the ability of Pichia pastoris ATCC 28485 yeast to growth on media containing biodiesel waste as a carbc source. In batch cultures the total biomass yield and biomass productivity for P. pastoris yeast were the highest and amounted 0.65 g/g and 1.94 L • hr, respectively in medium containing raw glycerol and methanol. This strain was unable to grow in media with free fatty acids or degumming as carbon source. The protein concentration in yeast biomass varied from 25 to 39.3%.

6

Company strategy in the crisis period

Malindzak D., Mervart J.

Total Logistic Management

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2010

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no. 3

41-51

EN

The article deals with the logistic strategies enabling an enterprise to create a strategy flexible in terms of business and marketing and stable in terms of manufacturing. In order to create a strategy model the following principles can be applied: shorter periods of capacity planning combined with flexible planning, SYNCRO – MRP principle, the application of forecasting in operative planning, creation with partners one of the cooperation form as supply chain, demand chain, lean supply chain, agile supply chain, leagile supply chain, and using the DBR, APS and SCP systems.

PL

W artykule zaprezentowano rozwiązania logistyczne umożliwiające przedsiębiorstwom tworzenie elastycznych strategii biznesowych i marketingowych oraz stabilnych w środowiskach produkcyjnych. Do utworzenia modelu strategii mogą być stosowane następujące zasady: krótsze okresy planowania zdolności w połączeniu z elastycznym planowaniem, zasada Syncro-MRP, stosowanie prognozowania w planowaniu operacyjnym, utworzenie z partnerami jednej z form współpracy w łańcuchu dostaw, łańcuchu popytu, odchudzonym łańcuchu dostaw, zwinnym łańcuchu dostaw oraz wykorzystanie systemów klsy DBR, APS i SCP.