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1
Content available Modeling the vibratory roller compaction process of road soils
Căpăţînă Dragoş, Niţu Marilena Cristina, Iliescu Mihaiela
Archives of Civil Engineering
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2023
|
Vol. 69, nr 4
431--444
EN
Road infrastructure is aimed to be sustainable construction in today’s condition of heavy traffic. Depending on geotechnical characteristics of soils there are chosen adequate techniques for compaction, meaning: type of compaction, equipment, compaction parameters and, if possible, computer aided acquisition and processing of data. This paper presents research results on the vibratory roller compaction process of road soils, from the point of view of process mathematically modeling and statistically modeling of process parameters interdependence. The obtained regression model is innovative one and fit for further application in optimization (by AI and IoT) of the compaction process. Good correlation of all the results (self-pulsation values) proves the adequate assumptions for both modeling and experimenting. Further development of this research is intended to develop a special software for direct correlation of road geographical position and soil characteristics to the compaction process parameters optimum values.
2
Preliminary research of monitoring of soil density
Kwaśniewski Arkadiusz
Zeszyty Naukowe Instytutu Pojazdów / Politechnika Warszawska
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2019
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z. 3/121
31--39
EN
This work presents the preliminary method for assessment of the degree of the soil compaction from two types of research performed by the author. The first type of research was the tests with sensors placed directly on the rammers foot in the laboratory stand. The second stage of works was to perform test with the same stand and the machine with sensors placed on the measuring plate nearly the rammer. The results of test are processed and on the spectrum chart in the function of frequency are presented. This allow to show the differences between the loose and compacted soil. The difference type of mounting sensors has influence to vibroacoustic signal and on the frequency spectrum.
PL
W pracy została zaprezentowana wstępna metoda oceny stopnia zagęszczenia ośrodka gruntowego na podstawie dwóch typów badań wykonanych przez autora. Pierwszym typem były badania przy użyciu maszyny zagęszczającej grunt znajdujący się w stanowisku laboratoryjnym, z czujnikami zamocowanymi bezpośrednio do stopy maszyny. Drugim etapem prac było wykonanie testów przy użyciu tego samego stanowiska i maszyny z czujnikami umieszczonymi na płycie pomiarowej obok zagęszczarki. Obróbka uzyskanych wyników i przedstawienie ich na wykresach widma w funkcji częstotliwości, pozwoliło na ukazanie różnic pomiędzy ośrodkiem luźnym i zagęszczonym. Zostały zaprezentowane różnice pomiędzy typem umieszczenia czujników na sygnał wibroakustyczny, a także na samo widmo amplitudowo-częstotliwościowe.
3
Energochłonność przetwarzania materiałów roślinnych na cele energetyczne
Szymanek M., Tanaś W., Kassar F. H., Kachel-Jakubowska M., Prus A.
Logistyka
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2015
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nr 5
603--611, CD1
PL
W pracy przedyskutowano wpływ wybranych czynników wpływających na proces rozdrabniania i zagęszczania biomasy roślinnej w aspekcie jakości pozyskiwanego produktu finalnego (brykietu, peletu) oraz ponoszonych nakładów energetycznych. Przedstawiono także wybrane teoretyczne podstawy dotyczące rozdrabniania i zagęszczania.
EN
In the paper the influence of chosen factors on process of disintegration and densification was presented. The quality and energy consumption of final product (briquette, pellets) was evaluated. Some chosen theory of this proces s was showed.
4
Content available Compaction of lignite: a review of methods and results
Widera M.
Acta Geologica Polonica
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2015
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Vol. 65, no. 3
367--378
EN
The published peat:coal compaction ratios range from 1.1:1 to 60:1 and from 1.1:1 to 11:1 for lignites. These probably represent realistic end-member values for the degree of compaction during the transformation of peat into lignite and then to coal. Hence, in many cases, the obtained values of the compaction ratio are under- or overestimated with reference to the entire coal seam. This study focuses on the changes of thickness between a peat bed and the resulting lignite seam. The fundamental question is how many times the thickness of the peat bed, prior to covering the mire by the overburden, was greater than the present-day thickness of the lignite seam. The majority of methods reported in this paper cannot be used directly to quantify the amount of compaction of the lignite seam. In this context, the only category of methods which allow a direct estimation of the peat:lignite compaction ratio are the so-called stratigraphic methods. Therefore, based on comparison of the initial peat bed thickness with lignite seam thickness, the most accurate peat:lignite compaction ratio ranges from 2:1 to 4:1.
5
Content available remote Strength measurement of impulse compacted moulding sand
Mikulczyński T., Ciskowski S.
Archives of Foundry Engineering
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2011
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Vol. 11, iss. 1
79-82
EN
Analysis of impulse compaction process shows that during compaction process moulding sand is subject to deformation and changes of total pressure, measured inside compacted moulding sand, represent fading sinusoid. Measured pressure values in stationary states (after compaction process) are equal to the sum of squeezing pressure pc and the pressure resulting from compacting the sandmix pu, which expresses the obtained strength. Therefore experimental research of moulding sands were conducted. Strength factor Rc and pressure pu values were determined as a function of densening degree \delta. Analysis of presented results proves that pu pressure resulting from compacting of the moulding sand expresses compressive strength factor Rc. This confirms that developed methodology permits strength measurements of moulding sand in the mould. Moreover as it is possible to determine pu values with simulation research of developed mathematical model of impulse process it is possible to determine compressive strength factor.
6
Content available remote Selected simulation and experimental research of impulse compacting of moulding sand
Mikulczyński T., Ciskowski S.
Archives of Foundry Engineering
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2009
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Vol. 9, iss. 1
57-60
EN
Selected simulation and experimental research of impulse compacting of moulding sand has been presented. The mathematical model used in research was formulated on the ground of mathematical description of the impulse compacting head, as well as mathematical description of the deformation and compacting process of moulding sand. The presented simulating investigations of the mathematical model were performed in the Matlab - Simulink environment. The presented results justify the statement that the suggested mathematical model correctly represents the real course of the impulse compacting process of moulding sands and can be used for describing, designing and optimising the process.
7
Content available remote Mechanism of impulse compacting of moulding sands
Mikulczyński T., Bogdan M., Ciskowski S., Dworzak Ł.
Archives of Foundry Engineering
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2008
|
Vol. 8, iss. 1 spec.
211--214
EN
A mathematical 3D model of impulse compaction process, developed in the Basic Automation Laboratory of the Institute of Production Engineering and Automation is presented. Experimental and simulation research analysis allowed to determine mechanism of impulse compacting of moulding sands. Mechanism and dynamics of this process evaluated on the grounds of relationships pc = f(t) representing time functions of total pressure in the sand layers located at different heights of the compacted sand column. Presented experimental and simulation research proved that developed 3D mathematical model of impulse compaction process of moulding sand describes this process in detail.
8
Content available remote Badania nowej konstrukcji formierki impulsowo-prasujacej
Izdebska-Szanda I., Leśniewski W., Pezarski F., Soliński W.
Archiwum Odlewnictwa
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2006
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R. 6, nr 18/2
483--488
PL
Wychodząc naprzeciw potrzebom krajowych odlewni, Instytut Odlewnictwa - Kraków i Dozamet – Nowa Sól opracowały nową konstrukcję formierki impulsowo-prasującej, przeznaczonej do wykonywania połówek form z mas bentonitowych w skrzynkach o wymiarach 1000 x 800 x 250 – 350 mm. Ideą nowej konstrukcji jest umieszczenie zespołu impulsowego i prasującego w jednej przestrzeni. W artykule przedstawiono wyniki prób i badań nowej konstrukcji formierki na stanowisku badawczym w Dozamet - Nowa Sól.
EN
To meet the requirements of the domestic foundries, Foundry Research Institute in Cracow and Dozamet – Nowa Sól offered a new design of the impulse-squeeze moulding machine assigned for manufacture of half moulds made from bentonite sands in flasks of 1000 x 800 x 250 – 350 mm dimensions. The crucial point of this new design is placing the impulse and squeeze assemblies within one single space. The paper gives the results of the tests and trials carried out on this new moulding machine on a pilot post operating at Dozamet - Nowa Sól.
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