Temat: technical diagnostics

Skocz do pozycji: 1.

Tytuł:: The diagnosis of onboard generators (alternators)
Autorzy:: Gębura, A.
Radoń, T.
Tematy:: technical diagnostics
frequency modulation; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/258804.pdf Link otwiera się w nowym oknie
Opis:: In the paper selected problems related to diagnostics of onboard generators and alternators fitted with control systems are discussed. Problems refer to commutator generators and synchronous single- and threephase alternators. Special attention is paid to commutation effects. Results of incorrectness and possibility to detect them are discussed. There are also discussed effects associated with changes in a character of pulsation, which occur during shortings or insulation clearances in rotor or stator wiring. Possibility of diagnosis of generator’s or alternator’s parts by means of analysis of pulsation component parameters is indicated. In the case of alternators a number of diagnostic methods based on observation of changes in shape of voltage or frequency modulation, is discussed. This allows to detect many mechanical or electrical faults of generators, alternators or their control systems.
Dostawca treści:: Biblioteka Nauki

Artykuł

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Skocz do pozycji: 2.

Tytuł:: Niezawodność dostaw energii elektrycznej jako miara efektywności diagnostyki technicznej w sieciach elektroenergetycznych
Reliability of electricity supply as a measure of the efficiency of technical diagnostics in distributed power networks
Autorzy:: Dąbrowska-Kauf, G.
Tematy:: reliability
technical diagnostics
electricity
transformers; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Powiązania:: https://bibliotekanauki.pl/articles/329388.pdf Link otwiera się w nowym oknie
Opis:: Sieć elektroenergetyczna składa się z wielu urządzeń i jest narażona na działanie różnorodnych czynników, które powodują zakłócenia w jej pracy. Skutkiem tego mogą być przerwy w zasilaniu lub pogorszenie jakości energii elektrycznej. Długość tych przerw zależy w istotny sposób od prawidłowej diagnostyki: elementów sieci i procesów przesyłu i dystrybucji energii elektrycznej. Efektywność diagnostyki technicznej w sieciach elektroenergetycznej wpływa bezpośrednio na niezawodności dostaw energii elektrycznej. W artykule omówiono metodę pozwalającą mierzyć efektywność diagnostyki technicznej w oparciu o wykorzystanie wyznaczanych współczynników niezawodności poszczególnych elementów sieci elektroenergetycznej.
Distributed power network consists of many devices and therefore it is exsposed to the activity of various factors which result in interferences during their work. The causes of this include pauses in power supply and deterioration of the eneregy's quality. The length of the pauses depends in an essential way on undertaking correct diagnostical decisions in the area of the power network's elements and the electricity distribution. Efficiency of technical diagnostics in power network depends directly on reliablity rate of electricity supply. In the article, the method, that allows measuring the efficiency of technical diagnostics, based on a usage of assigned coefficients of reliability rates of particular elements in the power network, is presented.
Dostawca treści:: Biblioteka Nauki

Artykuł

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Skocz do pozycji: 3.

Tytuł:: Keeping mining machinery in operation based on energy factors
Autorzy:: Korbiel, Tomasz
Czerwiński, Stefan
Tematy:: maintenance
technical diagnostics
energy indicators; Pokaż więcej
Wydawca:: Instytut Techniki Górniczej KOMAG
Powiązania:: https://bibliotekanauki.pl/articles/27324328.pdf Link otwiera się w nowym oknie
Opis:: Mining machinery maintenance strategy based on the current dynamic condition of the equipment not only improves reliability, reduces repair and renovation costs, but also affects electricity costs. Due to the use of modern monitoring and diagnostic systems, as well as advanced control and supervision methods, it is possible to improve the efficiency of devices and thus reduce energy costs. Due to the high power of the devices, even a slight decrease in efficiency translates into significant financial resources. Taking into account the prices of electricity as well as ecological aspects, investments in modern solutions give specific financial and social savings.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 4.

Tytuł:: Modelling in technical diagnostics
Autorzy:: Żółtowski, B.
Tematy:: technical diagnostics
identification
modelling
modal analysis; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/247646.pdf Link otwiera się w nowym oknie
Opis:: The knowledge of the dynamic stat and structure of the system allows desercribing its behaviour, and allows creating prognosis models of the system behaviour in the function of dynamic evolution time, based on the model of the technical state symptoms growth. Most often, however, there are no known equations describing behaviours of the system in the function of dynamic evolution time, which accounts for the need to apply new tools to examine the dynamic state. There is, therefore, the requirement to experimentally verify analytical technical models as the proper one is a model which is verified in practice. An experiment is, therefore, often only an inspiration for further researches leading to the optimization of the construction. In this work presented are chosen problems of machines technical state diagnosis with the use of identification and technical diagnostics methods. Relations between methods of dynamic state evaluation and methods of technical state evaluation were indicated. Example modal analysis results illustrate the complexity of projecting dynamic state researches into diagnostic researches of machine state evaluation.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 5.

Tytuł:: Evaluation of degradation of bricks using FRF
Autorzy:: Żółtowski, M.
Napieraj, K.
Tematy:: technical diagnostics
identification
modeling
modal analysis; Pokaż więcej
Wydawca:: Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Powiązania:: https://bibliotekanauki.pl/articles/390073.pdf Link otwiera się w nowym oknie
Opis:: The knowledge of the dynamic state and structure of system allows to describe its behavior, and allows a model of the system behavior in the function of dynamic evolution time, based on the model of the technical state symptoms growth. Most often, there are no known equations describing behaviors of the system in the function of dynamic evolution time, which accounts for the need to apply new tools to examine the dynamic state. In this article authors shows chosen problems of technical state diagnosis with the use of identification and technical diagnostics methods such as experimental modal analysis. Relations between methods of dynamic state evaluation and methods of technical state evaluation were indicated. Example modal analysis results illustrate the complexity of projecting dynamic state researches into diagnostic researches of state evaluation.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 6.

Tytuł:: The use of the vibration method in testing steel load-bearing cables for the purpose of developing a method of measuring their state of tension
Autorzy:: Bartmański, C.
Bramorska, A.
Tematy:: technical diagnostics
vibration
cables stress
modal analysis; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/114407.pdf Link otwiera się w nowym oknie
Opis:: In technical diagnostics of load-bearing tendons of bridge and building structures, vibration methods are popular due to simplicity, speed of results and low costs of their application. The aim of the research was to develop a method for measuring the load-bearing cables stress. The article presents the results of tests on the cable testing stand, which enable identification of the parameters of the cable dynamic model. In the research, a technique was applied consisting in impulse stimulation to vibrations of the tense steel cable and analysis of signals, which are a response of the cable to this excitation. Using the modal analysis method, the dependence of the frequency of various forms of the cable natural vibrations on the cable tensioning force was determined. Three types of cables were tested. The bending rigidity of the cable was determined. Using the modal analysis method as a reference method, the usefulness of a simpler method of evaluating cable natural frequency, was examined.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 7.

Tytuł:: The system of measurement of underwater objects with the visual method
Autorzy:: Olejnik, A.
Tematy:: underwater works technology
underwater photogrammetry
technical diagnostics; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/245460.pdf Link otwiera się w nowym oknie
Opis:: This material presents the results of works implemented so far at the Department of Underwater Works Technology of the Polish Naval Academy in Gdynia within the project No. O N502 274039 focused on an attempt to prepare theoretical assumptions for the visual diagnostics system for underwater objects. The main accomplishments until now have been the preparation of a mathematical model allowing specification of dimensions of photographed underwater objects and construction of a prototype underwater photogrammetric camera together with software used in frame analysis. Moreover, the project involved carrying out experiments resulting in an initial assessment of the prepared method. Currently obtained results indicate that the measurement method under verification based on a light model constitutes a rough measurement method. Relative uncertainties regarding the measurement of linear quantities at average amount to 10%. What has a significant impact on the size of this error is the fact of defining nodal points in relation to figures and segments analysed in a given frame with the use of a cursor manually controlled with a computer mouse. This leads to the conclusion that ‘manual’ introduction of nodal points for the examined figures constitutes the weakest element of the verified measurement method and its modification will be the main objective of further research. It is expected that the CYKLOP camera and the application prepared for its operation will constitute a system for a technical assessment of underwater objects on the basis of visual research. This will be an important leap in relation to the quality of the visual examination of underwater objects, as the methods used so far allowed only qualitative assessment of objects. The constructed system will, on the other hand, enable obtaining both qualitative and quantitative data.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 8.

Tytuł:: Newtonian and Bergsonian time in technical diagnostics
Autorzy:: Borowczyk, H.
Lindstedt, P.
Manerowski, J.
Tematy:: technical diagnostics
reliability
Newtonian time
Bergsonian time; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/247474.pdf Link otwiera się w nowym oknie
Opis:: Testing and reasoning are two main closely related diagnostic activities. Diagnostic testing is realized in Newtonian (short) time while diagnostic reasoning - in (long) Bergsonian time. Both sort of time are used to analyze different kinds of problems in diagnostics and reliability of technical objects. Newtonian and Bersonian time differentiation needs some expert knowledge. In this paper, considerations are based on observation that Newtonian time of diagnostic testing is related to object maintenance (adjustment) and Bergsonian time is related to object is reliability. A significant change of the object’s technical condition (signals or parameters of the state) causes changes of its regulation state (quality indicators change) and the characteristics of reliability. As it is required for the operation and reliability to be always appropriate and permanent, the control should be adjusted to functional needs of the object, and the use should be adapted to the current characteristics of reliability. Therefore, change of the settings of the control device (made during the handling of the object) represents the change of technical condition and state of reliability. It is presumed that, during the operation of a technical object, the selection of the control settings for damaged object is impossible. This fact, when predicted, becomes the basis for the prediction of the object reliability.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 9.

Tytuł:: Model zmiany stanu obiektu technicznego w procesie eksploatacji
Model facility technical changes during operation
Autorzy:: Duer, S.
Tematy:: diagnostyka urządzeń technicznych
stan obiektów technicznych
diagnostyka techniczna
technical objects diagnostics
technical objects state
technical diagnostics; Pokaż więcej
Wydawca:: Instytut Naukowo-Wydawniczy TTS
Powiązania:: https://bibliotekanauki.pl/articles/251909.pdf Link otwiera się w nowym oknie
Opis:: W pracy przedstawiono opis inteligentnego podsystemu diagnostycznego obiektu technicznego. Ważkim aspektem artykułu jest zaprezentowany w nim model istoty zmiany stanów w obiekcie. Podstawą organizacji diagnozowania stanów w obiekcie jest rozpoznanie aktualnego stanu obiektu. Wyznaczona w procesie diagnozowania informacja o stanie obiektu jest uogólnieniem zbioru stanów jego elementów składowych.
This paper describes an intelligent diagnostic subsystem of a technical object. A strong aspect of the article is presented in the model being alterations of the facility. The basis for the organization of diagnosis of conditions in the facility is the current status of the object. Determined in the process of diagnosing the information about the state of the object is a generalization of the set of all its components.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 10.

Tytuł:: Identification of service failures of cylinder valves of ship piston combustion engines
Autorzy:: Korczewski, Z.
Tematy:: technical diagnostics
ship diesel engine
valve timing; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/260423.pdf Link otwiera się w nowym oknie
Opis:: This paper presents selected diagnostic problems of charge exchange system of ship piston combustion engines. Theoretical background of wear process of cylinder valves was highlighted in the aspect of identification and sources of known and identifiable states of unserviceability. The presented results of endoscopic examinations concern failures of cylinder valves of the engines installed on Polish Navy ships.
Dostawca treści:: Biblioteka Nauki

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