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1
100%
Journal of KONES
EN The results of investigation of 1,9 TDI engine (285 Nm, 85 kW, type AJM without any modification) equipped with injection units supplied conventional diesel fuel (ON) or B100 fuel (RME) have been presented in article. Investigations have been realized at the engine speed of 2000 rpm and variable loa[...]
2
80%
Metrology and Measurement Systems
EN Current methods of fault diagnosis for the grounding grid using DC or AC are limited in accuracy and cannot be used to identify the locations of the faults. In this study, a new method of fault diagnosis for substation grounding grids is proposed using a square-wave. A frequency model of the groundi[...]
3
80%
Metrology and Measurement Systems
EN This paper is devoted to measuring the continuous diagnosis capability of a system. A key metric and its calculation models are proposed enabling us to measure the continuous diagnosis capability of a system directly without establishing and searching the sequential fault tree (SFT) of the system. A[...]
4
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Journal of KONES
EN A fault recognition technique for the internal combustion engines using time-frequency representations of vibration signal has been presented in this paper. Engine block vibration results as a sum of many excitations mainly connected with engine speed and their intensity increases with the appearanc[...]
5
80%
Silniki Spalinowe
2009 R. 48, SC1 229--233
PL W artykule przedstawiono typowe uszkodzenia występujące we współczesnych silnikach samochodowych oraz możliwości ich diagnozowania. Przeanalizowano uszkodzenia silników w 200 samochodach jednej marki. Uszkodzenia obejmowały unieruchomienie silnika, zwiększenie zużycia paliwa, przyspieszone zużycie w[...]
EN This paper presents analysis of typical faults occurring in contemporary automotive engines and possibility of damage detection. The engines of 200 cars of the same make have been analysed as far as engine damage are concerned. Higher fuel consumption, more rapid wear of the engine components, damag[...]
6
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Bulletin of the Polish Academy of Sciences. Technical Sciences
EN The paper deals with a multiple fault diagnosis of DC transistor circuits with limited accessible terminals for measurements. An algorithm for identifying faulty elements and evaluating their parameters is proposed. The method belongs to the category of simulation before test methods. The dictionary[...]
7
80%
Metrology and Measurement Systems
EN A basic circuit theory of fault diagnosis for analog circuits with parameter tolerance is proposed in this paper. The approach uses the direction vector of voltage increment in test nodes as a fault signature for predefined faults. A linear equation is built to locate a faulty element. On the condit[...]
8
80%
Bulletin of the Polish Academy of Sciences. Technical Sciences
EN The paper introduces a unified method for fault diagnosis in analog dynamic systems of different physical nature (e.g. electronic, mechanical, power, hydraulic). The method also handles mixed systems composed of multi-phenomena blocks. Applicability of the diagnosis algorithm, originally designed fo[...]
9
80%
Metrology and Measurement Systems
EN This paper is devoted to multiple soft fault diagnosis of analog nonlinear circuits. A two-stage algorithm is offered enabling us to locate the faulty circuit components and evaluate their values, considering the component tolerances. At first a preliminary diagnostic procedure is performed, under t[...]
10
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Metrology and Measurement Systems
2014 Vol. 21, nr 4 663--674
EN This paper deals with multiple soft fault diagnosis of nonlinear analog circuits comprising bipolar transistors characterized by the Ebers-Moll model. Resistances of the circuit and beta forward factor of a transistor are considered as potentially faulty parameters. The proposed diagnostic method ex[...]
11
80%
Archives of Acoustics
2017 Vol. 42, No. 3 401--414
EN Journal bearings are widely used to support the shafts in industrial machinery involving heavy loads, such as compressors, turbines and centrifugal pumps. The major problem that could arise in journal bearings is catastrophic failure due to corrosion or erosion and fatigue, which results in economic[...]
12
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International Journal of Electronics and Telecommunications
EN Extension of the method of analog circuit parameter identification for the specified design performances, originally presented by the same author in 1982, is described. These parameters are designated by means of PSpice simulation of the adjoint circuit to the original one. In this adjoint circuit, [...]
13
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Metrology and Measurement Systems
2016 Vol. 23, nr 2 239--250
EN The paper deals with fault diagnosis of nonlinear analogue integrated circuits. Soft spot short defects are analysed taking into account variations of the circuit parameters due to physical imperfections as well as self-heating of the chip. A method enabling to detect, locate and estimate the value [...]
14
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Metrology and Measurement Systems
EN In this paper, the application of the SVM (Support Vector Machine) algorithm has been used for diagnosis and tests of analog electronic circuits. The diagnosis procedure belongs to simulation-before-test techniques, where simulations of the circuit under test (CUT) are performed at the before-test s[...]
15
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Archives of Control Sciences
2014 Vol. 24, no. 3 271--287
EN The inherent characteristics of fuzzy logic theory make it suitable for fault detection and diagnosis (FDI). Fault detection can benefit from nonlinear fuzzy modeling and fault diagnosis can profit from a transparent reasoning system, which can embed operator experience, but also learn from experime[...]
16
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Bulletin of the Polish Academy of Sciences. Technical Sciences
2014 Vol. 62, nr 3 571--582
EN The survey presents a selection of the methods of the fault detection and isolation suitable to be useful for the diagnostics of the complex, large scale industrial processes. The paper focuses on these methods that have appropriately high level of potential applicability in industrial practice. The[...]
17
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Journal of KONES
EN One of the most important subsystems of the vehicles and machines operating currently in industry and transportation are the rotating subsystems. During the operation, due to the forcing factors influence, the technical state of them is changing and the failure can occur. Fault diagnosis is maintena[...]
18
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Polish Maritime Research
2018 S 2 92--97
EN The research work in this paper belongs to the application of granular computing, graph theory and its application in fault detection and diagnosis. It is a cross cutting and frontier research field in computer science, information science and graph theory. The results of this paper are of great sig[...]
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Bulletin of the Polish Academy of Sciences. Technical Sciences
EN An evolutionary method for analogue integrated circuits diagnosis is presented in this paper. The method allows for global parametric faults localization at the prototype stage of life of an analogue integrated circuit. The presented method is based on the circuit under test response base and the ad[...]
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Metrology and Measurement Systems
EN Considering the problem to diagnose incipient faults in nonlinear analog circuits, a novel approach based on fractional correlation is proposed and the application of the subband Volterra series is used in this paper. Firstly, the subband Volterra series is calculated from the input and output seque[...]
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