Wyniki wyszukiwania - BazTech

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An estimation of lithium-ion battery state of health - ageing-included modelling and experimental studies

Mroz P., Gorny P., Ekiert M., Uhl T.

Diagnostyka

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2016

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Vol. 17, No. 2

25--34

EN

In this paper we present a study on Li-Ion Battery (LIB) modelling, including battery ageing profile, as a ground for development of state of health (SoH) prediction and monitoring system. An influence of LIB ageing was included by the mean of ageing module, based on voltage, resistance and capacity characteristics, resulting from preliminary experimental measurements. Our model, based on equivalent circuit model (ECM) and parameter estimation procedure, was implemented in MATLAB software and then validated. The simulation results are used for battery SoH estimation, which may be use in a future to optimize the conditions of LIB cycling and therefore extend the battery lifetime.

PL

Niniejszy artykuł przedstawia badania nad stworzeniem modelu baterii litowo-jonowej, uwzględniającego procesy starzenia baterii, jako podstawę do budowy systemu monitorowania stanu baterii. Wpływ procesów starzenia został uwzględniony za pomocą specjalnego modułu, zdefiniowanego przy pomocy parametrów (tj. charakterystyki napięciowe, impedancyjne, pojemnościowe) uzyskanych na drodze pomiarów eksperymentalnych. Opracowany model, oparty na równoważnym dwugałęziowym modelu elektrycznym RC, został zaimplementowany w środowisku MATLAB, a następnie poddany walidacji. Wyniki przeprowadzonych symulacji wykorzystano do opracowania algorytmu estymacji stanu baterii, który w przyszłości może posłużyć do optymalizacji warunków pracy ogniw litowo-jonowych.

2

The studies on lubricity and contamination analysis of the personal car’s lubricating oil with taking oil ageing into account

Sikora G.

Journal of KONES

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2013

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Vol. 20, No. 3

375--379

EN

In this paper, the results of researches on lubricity and content analysis of the personal car’s engine oil are presented. The measurements of lubricity are made on the T02-U four-ball tester. The content analysis is made on the Spectroil Q100 spectrometer, which makes it available to measure the amount of 24 chemical elements. Due to this analysis, technical condition of the engine is possible to estimate. Tested oil is Shell Helix AV-L, which was exploited in the personal car, Volkswagen Touran, equipped with the turbo charged diesel engine, with the capacity of 2.0 litres. The samples for oil ageing characteristics were taken from the engine in the intervals approx. 3500 km. This research was performed as a result of the other studies on the dynamic viscosity characteristics. In the viscosity researches for this oil, was shown, that in the first period of the exploitation time, the viscosity decreases significantly. Detailed research on the additives and wear products content, as well as a lubricity characteristic, defines the reason of such a significant decrease of the oil properties. This paper is a part of a wider research on the oil ageing characteristics. It will support development to the new mathematical model of the lubricating oil viscosity changes during the exploitation time of the engine

3

Studies on dynamic viscosity changes of the engine’s lubrication oil depending on the pressure

Sikora G.

Journal of KONES

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2013

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Vol. 20, No. 4

405--409

EN

This paper is a part of the wider author’s research on the development of the new mathematical model for description of the viscosity changes of the lubrication oil in the exploitation time. Pressure of the oil is a variable parameter in the combustion engine and depends on many design parameters such as oil pump efficiency, geometry of the channels and lubricated element. It depends also on the exploitation parameters, such as rotational speed of the engine or contamination degree of the oil filter. So big amount of the factors, which have an influence on the pressure, resulted in the decision to examine, how big influence has a pressure in the oil viscosity. For the researches, the oil samples from the different combustion engines, both petrol and diesel, with different capacities, were taken into account. In each case, for the examination were taken samples both for the fresh oil and used oil from the change. Results of this research are shown in the tabular in correlation to the engines specification. In the next researches, after collecting all the oil ageing data, author will examine the pressure distribution in the slide bearing. After that it will be will possible to estimate the importance of the pressure changes for the proper work of the engine.

4

Simulating structural and hydraulic decline of sewer networks

Baur R., Schulz N., Hoeft S.

Prace Naukowe Instytutu Inżynierii Lądowej Politechniki Wrocławskiej. Konferencje

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2005

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Vol. 53, nr 20

30-39

EN

The structural condition of sewer pipelines is well documented by CCTV inspection. Recent research projects funded within the EU 5th framework programme, (e.g. the project CARE-S) aim at the interpretation of structural and hydraulic decline of urban drainage systems in order to better understand consequences of deteriorated systems and to forecast future rehabilitation needs. This case study combines structural deterioration and hydraulic simulation modelling for the development of a pro-active rehabilitation programme. Structural ageing of the sewer pipe network is simulated by a network deterioration model, whereas for the hydraulic simulation of the defect system, a model based on structural decline of single pipes is used. In addition, the effects of a reduction of infiltration into the network are calculated for a simplified network by an integrated model.

PL

Stan techniczny przewodów kanalizacyjnych jest dobrze udokumentowany wynikami inspekcji CCTV. Ostatnie badania wspomagane przez Piąty Program Ramowy (np. projekt CARE-S) mają na celu interpretację pogarszania się parametrów konstrukcyjnych i hydraulicznych miejskich sieci w celu lepszego zrozumienia konsekwencji starzenia się systemów i możliwości przewidzenia przyszłych potrzeb renowacyjnych. Prezentowany przykład praktyczny łączy modelowanie starzenia się konstrukcyjnego i hydraulicznego i ma na celu wypracowanie proaktywnego programu rehabilitacji. Strukturalne starzenie się przewodów sieci kanalizacyjnej symulowane były przy użyciu globalnego sieciowego modelu starzenia, podczas gdy pogarszanie się parametrów hydraulicznych symulowane było przez system defektów dla pojedynczych przewodów. Ponadto wzięto pod uwagę efekt redukcji infiltracji dla uproszczonej sieci Przy pomocy zintegrowanego modelu.