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1

Approach to solving mining machine selection problem by using grey theory

Milisavljevic V., Martinetti A., Cvjetic A.

Mining – Informatics, Automation and Electrical Engineering

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2018

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R. 56, nr 3

59--64

EN

The selection of a mining machine is a multiple-attribute problem that involves the consideration of numerous parameters of various origins. A common task in the mining industry is to select the best machine among several alternatives, which are frequently described both with numerical variables as well as linguistic variables. Numerical variables are mostly related to the technical characteristics of the machines, which are available in detail in most cases. On the other hand, some equally important parameters such as price, reliability, support for service and spare parts, operating cost, etc., are not available at the required level for various reasons; hence, these can be considered uncertain information. For this reason, such information is described with linguistic variables. This paper presents research related to overcoming this problem by using grey theory for selecting a proper mining machine. Grey theory is a well-known method used for multiple-attribute selection problems that involves a system in which parts of the necessary information are known and parts are unknown.

2

System dynamics as a decision support system for machine tool selection

Adane T. F., Nicolescu M.

Journal of Machine Engineering

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2016

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Vol. 16, No. 3

102--125

EN

The worldwide competitive economy, the increase in sustainable issue and investment of new production line is demanding companies to choose the right machine from the available ones. An improper selection can negatively affect the overall performance of the manufacturing system like productivity, quality, cost and companys responsive manufacturing capabilities. Thus, selecting the right machine is desirable and substantial for the company to sustain competitive in the market. The ultimate objective of this paper is to formulate a framework for machining strategy and also provide methodology for selecting machine tool from two special purpose machine tools in consideration of interaction of attributes. A decision support system for the selection of machine tool is developed. It evaluates the performance of the machining process and enhances the manufacturer (decision maker) to select the machine with respect to the performance and the pre-chosen criteria. Case study was conducted in a manufacturing company. A system dynamics modelling and simulation techniques is demonstrated towards efficient selection of machine tool that satisfy the future requirement of engine-block production.

3

Ocena kryterialna optymalnego doboru maszyn rolniczych

Komarnicki P., Stępień B., Stopa R.

Inżynieria Rolnicza

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2012

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R. 16, nr 4, t. 1

145-155

PL

W pracy przedstawiono koncepcję procedury optymalnego doboru maszyn rolniczych opartą o kryteria intensywności użytkowania maszyn oraz ograniczoności czasu agrotechnicznego. Przeprowadzone zostały obliczenia symulacyjne do oceny racjonalnego doboru kombajnu zbożowego oraz siewnika zbożowego w oparciu o przyjęte założenia dotyczące: struktury powierzchni pól, uprawianej rośliny, plonu, liczby dni dyspozycyjnych w okresie agrotechnicznym, wskaźników eksploatacyjno-ekonomicznych maszyn oraz ustalony normatyw godzin pracy w ciągu dnia. Przedstawiona procedura obliczeniowa pozwoliła wyznaczyć optymalne zakresy wykorzystania maszyn przy spełnieniu warunku podstawowych wymagań agrotechnicznych oraz określonym progu wydajności eksploatacyjnej. Z wyliczeń warunku intensywności użytkowania otrzymano, że skorygowane normatywne wykorzystanie dla siewnika zbożowego wynosiło 50 h*rok-1, natomiast dla kombajnu zbożowego kształtowało się na poziomie 116 h*rok-1. Wykazano, że dopuszczalne, rzeczywiste wykorzystanie godzinowe powinno być większe niż 40 hźrok-1 dla siewnika zbożowego, natomiast dla kombajnu zbożowego powinno przekraczać 92 h*rok-1.

EN

A concept of the procedure of optimal selection of agricultural machines based on intensity criteria of using machines and limitation of agrotechnical time was presented in the study. Simulation calculations for evaluation of rational selection of a combine harvester and a grain drill based on the accepted assumptions concerning the structure of the field surface, of the cultivated plant, crop, number of disposable days in an agrotechnical period, exploitation and economic indexes of machines and the established standard of working hours during a day were carried out. The presented calculation procedure allowed determining optimal scopes of using machines at meeting basic agrotechnical requirements and at the determined threshold of operational efficiency. From the calculations of the condition of intensity of use it was obtained that levelled normative use for a grain drill was 50 h*year-1, whereas for a combine harvester it was on the level of 116 h*year-1. It was proved that acceptable real hour use should be higher than 40 h*year-1 for a grain drill whereas for a combine harvester it should exceed 92 h*year-1.

4

Koncepcja optymalizacji doboru maszyn w rolnictwie

Banasiak J.

Inżynieria Rolnicza

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2008

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R. 12, nr 4(102)

47-52

PL

Wymagana terminowość zabiegów w rolnictwie powinna znaleźć wyraz w procedurze optymalizacji jakościowego i ilościowego doboru maszyn. Praca zawiera metodyczne propozycje zastosowania w doborze maszyn rolniczych procedur optymalizacyjnych z zastosowaniem kryteriów: czasu dyspozycyjnego i jednostkowego kosztu prac.

EN

The necessity to conduct agricultural practices on time should find its expression in the optimization procedure for qualitative and quantitative selection of machines. The paper includes methodical proposals concerning the use, in the selection of agricultural machines, of optimization procedures, basing on the criteria: disposable time and unit labour cost.