Wyniki wyszukiwania - BazTech

1

Using of technical diagnostics for an analysis of failure causes and consequences of a selected vehicle

Galliková J., Ruman F.

Logistyka

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2015

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nr 4

3296--3301, CD2

EN

Technical diagnostics is one of the major forms of the overall care of vehicles. It is through improving and streamlining maintenance that is non-invasive methods to execute the control of the functional situation and technical condition of the vehicles, their aggregates and construction units. This can significantly reduce maintenance costs and improve control of performed maintenance. The aim of introducing the diagnosis and the automatic diagnosis of vehicles is increasing the actual availability of vehicles, increase their reliability and operational safety, improve the quality and efficiency of maintenance and repair industry through control and decision-making activities. The work is based on an analysis of diagnostic methods, computer-aided FMEA analysis is performed on selected vehicle and the consequences of failure modes are determined. The results obtained from FMEA is done in the program APIS PRO 6.0 for the causes and consequences of failures. Critical parts are determined and measures to mitigate the effects of failures are proposed.

2

Calculation of LCC and LCP of a rail vehicle with the software support

Ruman F., Grenčík J.

Logistyka

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2015

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nr 4

5539--5546, CD2

EN

Nowadays complex demands are required from products to be reliable and provide their functions safe and without impacts on the environment. When deciding on the purchase of a product, the deciding factor is not only the acquisition costs, but also operating costs, preventive maintenance and corrective maintenance costs and the disposal costs as well. The manufacturer must design a product that will be failure-free and competitive, with the costs as low as possible, which can be achieved through the optimization of acquisition costs, cost of ownership and disposal costs. Ideally, this process should start from the very beginning of the product life and should be evolving with respect to all of the costs to be incurred throughout the life cycle. The aim of the work was to create own methodology for the calculation of costs and profits for the life cycle of a rail vehicle in terms of manufacturer and the operator to comply with all the relevant principles of the EN 60300-3-3 standard. The created methodology was implemented into the MS Excel software. The data on costs and profits during the life cycle of a tram were input into the software data. The data are mutually interconnected and may be monitored for any individual change that will affect other costs or profits for life cycle of a tram.

3

Proposal of new maintenance scheme of air brake system on semi-trailer combination

Ruman F., Grenčík J.

Diagnostyka

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2015

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Vol. 16, No. 2

11--19

EN

The paper deals with the proposal of new maintenance scheme of air brake system on a semi-trailer combination. The structure of semi-trailer and the current maintenance scheme of trailers are described with focus on the basic air brake system design. Analysis of wear and damage of air brake system components used on the semi-trailer combination based on real experience from practice and creation of the FMECA analysis of the system using software support are presented. Based on the analysis performed, a new scheme of maintenance was designed which was aimed at reduction of the risk related to failure consequences. Main objective was to reduce the impact of any failure in any component on the air brake system. Proposed intervals of preventive maintenance execution are based on the calculation of the total costs associated with the consequences of failures that may arise from them and compared with costs associated with service inspections carried out on the analysed semi-trailer fleet.

PL

W niniejszym artykule zaprezentowano nowy system eksploatacji pneumatycznego układu hamulcowego naczepy. Opisano w nim także obecną strukturę systemu technicznego naczepy z uwzględnieniem podstawowego układu hamulcowego. Przedstawiono opartą o rzeczywiste wyniki badań komputerową analizę zużycia i uszkodzeń elementów układu hamulcowego z wykorzystaniem metody FMEA. Na jej podstawie zaprojektowano nowy system eksploatacji analizowanego układu hamulcowego, charakteryzujący się zmniejszonym ryzykiem wystąpienia awarii. Głównym celem projektu było zredukowanie ryzyka wystąpienia uszkodzeń poszczególnych elementów układu hamulcowego. Zaproponowane terminy przeglądów profilaktycznych są wynikiem porównania ogółu kosztów wynikających ze skutków możliwych awarii a kosztami związanymi z kontrolą serwisową dla analizowanej grupy naczep.

4

LCC and LCP analysis of rail vehicles

Ruman F., Grencik J.

Logistyka

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2014

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nr 3

5490--5498

EN

It is a well-known fact that nowadays railway vehicles are designed and manufactured on much higher standard than older vehicles, many of them of obsolete concepts. On the other hand, nowadays railway vehicles designs are more complex and require much higher investment costs. Efforts to minimise costs and demonstrate the economic advantages of these new technologies and designs, throughout the life cycle (LC), launched a process of economic analysis called life-cycle cost analysis and life-cycle profit analysis (LCC and LCP). Life-cycle cost analysis is the process of economic analysis that focuses on the assessment of the total cost of acquisition and ownership, as well as the disposal of a product. This analysis provides important inputs to the decision-making process at the stages of design, development, use and disposal of a product. This paper deals with the analysis of currently the most widely used methods for calculating the costs and profits of the life cycle of a rail vehicle. Example calculation of the costs and profits of life-cycle of a tram with expected 30 years’ service life is presented, too. Following costs for the LCC calculation were used: 0.000 0.010 0.020 0.030 0.040 0.050 0.060 0.070 Profits from passengers Grants from the customer traffic Profits from advertising Euro /seat / km Revenues per kilometer and seat acquisition, preventive maintenance, corrective maintenance, accidents, cleaning, energy, track utilisation, power supply, overheads and salaries. Finally, the individual cost items are discussed.

5

Proposal of new maintenance system of air brake system on semi-trailer combination aimed at increase of operational safety

Grenčík J., Ruman F.

Autobusy : technika, eksploatacja, systemy transportowe

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2013

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R. 14, nr 3

1385-1392

EN

The paper deals with the proposal of new maintenance system of air brake system on a semitrailer combination. The structure of semi-trailer and the current maintenance system of trailers are described with focus on the basic air brake system design. Analysis of wear and damage of air brake system components used on the semi-trailer combination based on real experience from practice and creation of the FMECA analysis of the system using software support are presented. Based on the analysis performed, a new system of maintenance was designed which was aimed at reduction of the risk related to failure consequences. The proposed system uses RPN (risk priority number) values resulting from the proposed preventive maintenance system and is compared with the currentmaintenance system. Main objective was to reduce the impact of any failure in any component on the air brake system. On the basis of the analysis subsequently new methods of failures detection of air brake system components, preventive measures, and suggested new intervals of preventive maintenance for the air brake system are also proposed. Proposed intervals of preventive maintenance execution are based on the calculation of the total costs associated with the consequences of failuresthat may arise from them and compared with costs associated with service inspections carried out on the analysed semi-trailer fleet. The proposed maintenance system has decreased RPN values in comparison with the current system and in practical operation is expected to increase safety of semitrailer combinations, thus minimize probability of a failure in any component of the air brake system.