Wyniki wyszukiwania - BazTech

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Evaluation of stress-strain state of vehicles’ metal structures elements

Hrevtsev O., Selivanova N., Popovych P., Poberezhny L., Rudyak Yu., Shevchuk O., Poberezhna L., Ivanova A., Skyba O., Shashkevych O., Hrytsanchuk A.

Archives of Materials Science and Engineering

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2022

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Vol. 113, nr 2

77--85

EN

Purpose: Develop a method for determining and evaluating the stress-strain state, in particular the distribution of thermomechanical stresses in the materials of individual rotating parts of vehicles. Design/methodology/approach: The proposed method is based on the principle of gradual approximations of the solution when the boundary conditions are satisfied on the curvilinear limiting surfaces of the disk body. Findings: The proposed method of determining and estimating the distribution of thermomechanical stresses in the disk material makes it possible to take into account the variable geometry: thickness and presence of a hole in the central part of the disk, also correctly determine stress strain state at any point of unevenly heated rotating axial body. Research limitations/implications: The work uses generally accepted assumptions and limitations for thermomechanical calculations. Originality/value: It is proved that in real disks the stress-strain state is spatial, and the well-known method based on the hypotheses of the plane-stress state does not provide the possibility of calculating the values of stresses in the thickness of the disk. The obtained results can be used as a basis for improving the methodology of auto technical examination of road accidents. In addition, they can be taken into account by design engineers of car brake systems.

2

A software module for multi-criteria suppliers’ selection with respect to the spare parts logistic

Makarova Irina, Shubenkova Ksenia, Buyvol Polina, Mukhametdinov Eduard

Transport Problems

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2020

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T. 15, z. 1

105--116

EN

Reliability of vehicles is characterized not only by the quality of production but also by the quality of subsequent maintenance. In this paper, we consider the possible spare parts logistics risks, as they have a huge influence on vehicles’ maintenance. One of the widespread methods to analyze the reliability of complex systems is Fault Tree Analysis (FTA). To identify and systematize all possible risks in spare parts logistics, we have built the Problem Tree. For managing identified risks, we propose a conceptual scheme of an inteligent system. In the framework of this paper, we describe one of the modules that make up this intelligent system. The proposed software module will help to choose the spare parts’ suppliers taking into account their reliability from the logistical point of view. It was tested with the use of real data from an automotive manufacturer.

3

Ocena niezawodności wybranej grupy samochodów osobowych

Figlus T., Wilk A., Sadlik R.

Logistyka

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2014

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nr 3

1707--1716

PL

W artykule przedstawiono wyniki badań niezawodności wybranego modelu współczesnego samochodu osobowego klasy średniej. Podstawę badań statystycznych stanowiła grupa 100 pojazdów, której stan techniczny monitorowany był od momentu wyprodukowania do przebiegu 120 000 km. W pracy przeanalizowano rodzaje usterek występujących w pojeździe, ich częstotliwość, istotność występowania oraz pracochłonność napraw. Przeprowadzona w pracy analiza umoŜliwiła wyznaczenie podstawowych wskaźników niezawodności badanego samochodu osobowego tj. prawdopodobieństwa poprawnej pracy pojazdu, średniego przebiegu do pierwszego uszkodzenia, średniego przebiegu między uszkodzeniami pojazdu, parametru strumienia uszkodzeń oraz średniej pracochłonności napraw.

EN

The paper presents the results of research into the reliability of a selected model of a modern C-segment passenger car. The statistical research was based on a group of 100 vehicles whose technical condition had been monitored from the date of production to a mileage of 120,000 km. The paper contains an analysis of defects occurring in the vehicle as well as the frequency and significance of these defects and labour intensity of repairs. The analysis conducted in the paper allowed for the determination of basic reliability indicators of the examined passenger car, i.e. the probability of the correct operation of the vehicle, average mileage to the first defect, average mileage between defects, defect stream parameter and average labour intensity of repairs.

4

Określenie wskaźnika niezawodności samochodu na podstawie oceny jego stanu technicznego

Khashchyn Y., Polnar J.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

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2005

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z. 81

29-32

PL

W opracowaniu proponuje się obliczenie prawdopodobieństwa bezawaryjnej pracy oraz wskaźnika niezawodności samochodu na podstawie oceny jego stanu technicznego.

EN

In this paper the determination of no failure work probability and vehicle reliability index on the base of its technical state is proposed.