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    Wyświetlanie 1-7 z 7
    Tytuł:
    Rotating shaft fault prediction using convolutional neural network : a preliminary study
    Autorzy:
    Kolar, Davor
    Lisjak, Dragutin
    Pająk, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/246590.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    condition-based maintenance
    rotating systems
    fault diagnosis
    convolutional neural networks
    Opis:
    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 maintenance task considered as an essential in such subsystems, since possibility of an early detection and diagnosis of the faulty condition can save both time and money. To do this the analysis of the subsystems vibrations is performed. The identified technical state should be considered in a context of the ability and different inability states. Therefore, the first step of the diagnostic procedure is the ability and different inability states identification. Traditional data-driven techniques of fault diagnosis require signal processing for feature extraction, as they are unable to work with raw signal data, consequently leading to need for both expert knowledge and human work. The emergence of deep learning architectures in condition-based maintenance promises to ensure high performance fault diagnosis while lowering necessity for expert knowledge and human work. This article presents authors initial research in deep learning-based data-driven fault diagnosis of rotating subsystems. The proposed technique input raw three-axis accelerometer signal as high-definition image into deep learning layers, which automatically extract signal features, enabling high classification accuracy.
    Źródło:
    Journal of KONES; 2019, 26, 3; 75-81
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of inability states of rotating subsystems of vehicles and machines
    Autorzy:
    Pająk, Michał
    Lisjak, Dragutin
    Kolar, Davor
    Powiązania:
    https://bibliotekanauki.pl/articles/244261.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    rotating system
    technical state
    inability state
    ability state
    vibration signal
    diagnostics
    time domain analyse
    Opis:
    One of the most important subsystems of the vehicles and machines operating currently in industry and transportation are the rotating subsystems. During the subsystems operation, due to the forcing factors influence, the technical state of them is changing and the failure can occur. In order to avoid such a situation the technical state should be identified online. To do this the analysis of the subsystems vibrations is performed. The identified technical state should be considered in a context of the ability and different inability states. Therefore, the first step of the diagnostic procedure is the ability and different inability states identification. In the article, it is proposed to accomplish this goal by the vibrations analysis in time domain. The described research started with the vibration signals acquisition using the experimental stand. In this way, the vibration signals for ability and different inability states were obtained. Afterwards, the signals were divided into learning and testing data sets. For each signal from learning data set, several characteristics were calculated, and they selected the most significant among them. Using the selected characteristics, the signals from the testing data set were analysed. Thanks to it, the testing vibrations signals were counted among the signals collected on the rotating subsystem operating in ability or selected inability state. The result of the performed studies and the accuracy of the technical state of the tested system identification can be found at the end of the article.
    Źródło:
    Journal of KONES; 2019, 26, 1; 111-118
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fuzzy identification of the reliability state of the mine detecting ship propulsion system
    Autorzy:
    Pająk, Michał
    Muślewski, Łukasz
    Landowski, Bogdan
    Grządziela, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/259740.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ships
    rotational system
    mutual correlation
    non-coaxiality
    fuzzy clusters
    Opis:
    The study presents the evaluation and comparative analysis of engine shaft line performance in maritime transport ships of the same type. During its operation, a technical system performs functions for which it was designed. It goes through different states. Dynamic state changes of a rotational system can be identified by means of its vibration measurement. For this purpose, a research was carried out which involved recording vibrations of the analysed rotational systems. The recordings were used for calculating selected characteristics in the time-domain, where one of the most unique is the value of the normalized mutual correlation function. On the basis of the concentration values, the characteristics which unambiguously determine the ability state were selected for further studies. Then an identification method for rotational system non-coaxiality was proposed. The method involves using fuzzy clustering. According to this method the values of input signal characteristics were used to formulate fuzzy clusters of system ability and inability states. The method can be used for identifying the current state of the system. The study presents the results of the application of this method in engine turbine shaft lines of minesweepers, with the rotational system selected as an example. It needs to be noted that the efficiency of identifying the operating state of the system with this method is higher than with other methods described in the literature by authors who deal with this issue. The research results have a significant impact on the evaluation of mechanical properties of the studied objects and directly affect operational states of mechanical systems, including those installed in minesweepers, thus determining their reliability.
    Źródło:
    Polish Maritime Research; 2019, 1; 55-64
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Screening test for extracranial carotid lesions’ detection in patients of an outpatient vascular clinic
    Autorzy:
    Każmierski, Piotr
    Pająk, Michał
    Kruś-Hadała, Justyna
    Jęckowski, Mateusz
    Bogusiak, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/1392080.pdf
    Data publikacji:
    2019
    Wydawca:
    Index Copernicus International
    Tematy:
    atherosclerotic lesions
    abdominal aorta aneurysm
    carotid artery stenosis
    screening tool
    vascular surgery
    Opis:
    Purpose The objective of the study was to evaluate the frequency and severity of atherosclerotic lesions in extracranial sections of carotid arteries and to determine the level of the correlation between these lesions and symptoms of cerebral ischemia. Secondly, to identify the most common risk factors of ischaemic stroke occurrence in population of patients of vascular outpatient clinic. Material and Methods Prospective study was conducted on a group of 1,000 people (217 women and 783 men), aged 50 to 86 years, the average age was 62 years (± 9.95). Results Atherosclerotic lesions of carotid arteries were observed in 670 examined people (67%). In 63 cases (6.3%) carotid artery occlusion was revealed. Patients with symptomatic carotid artery stenosis more frequently were addicted to cigarettes and suffered from hypertension in comparison to asymptomatic group. A statistically significant correlation between the TIA or ischemic stroke and smoking were noticed, as well as between TIA/ischemic stroke and hypertension Conclusions Among patients with atherosclerosis of peripheral arteries atherosclerotic lesions in the extracranial carotid sections occur with a high frequency. Statistically significant differences in the incidence and severity of atherosclerotic lesions in the carotid arteries were observed in this group. A statistically significant correlation was revealed between the prevalence and severity of atherosclerosis in the carotid arteries in symptomatic patients and smoking and hypertension. Performing screening in patients with atherosclerosis of the abdominal aorta and/or lower limb arteries may detect significant carotid artery stenosis, requiring surgical intervention.
    Źródło:
    Polish Journal of Surgery; 2019, 91, 5; 5-11
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badania przesiewowe zmian w pozaczaszkowych odcinkach tętnic szyjnych u pacjentów Poradni Chirurgii Naczyniowej
    Autorzy:
    Każmierski, Piotr
    Pająk, Michał
    Kruś-Hadała, Justyna
    Jęckowski, Mateusz
    Bogusiak, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/1392097.pdf
    Data publikacji:
    2019
    Wydawca:
    Index Copernicus International
    Tematy:
    badania przesiewowe
    chirurgia naczyniowa
    tętniak aorty brzusznej
    zmiany miażdżycowe
    zwężenie tętnic szyjnych
    Opis:
    Purpose The objective of the study was to evaluate the frequency and severity of atherosclerotic lesions in extracranial sections of carotid arteries and to determine the level of the correlation between these lesions and symptoms of cerebral ischemia. Secondly, to identify the most common risk factors of ischaemic stroke occurrence in population of patients of vascular outpatient clinic. Material and Methods Prospective study was conducted on a group of 1,000 people (217 women and 783 men), aged 50 to 86 years, the average age was 62 years (± 9.95). Results Atherosclerotic lesions of carotid arteries were observed in 670 examined people (67%). In 63 cases (6.3%) carotid artery occlusion was revealed. Patients with symptomatic carotid artery stenosis more frequently were addicted to cigarettes and suffered from hypertension in comparison to asymptomatic group. A statistically significant correlation between the TIA or ischemic stroke and smoking were noticed, as well as between TIA/ischemic stroke and hypertension Conclusions Among patients with atherosclerosis of peripheral arteries atherosclerotic lesions in the extracranial carotid sections occur with a high frequency. Statistically significant differences in the incidence and severity of atherosclerotic lesions in the carotid arteries were observed in this group. A statistically significant correlation was revealed between the prevalence and severity of atherosclerosis in the carotid arteries in symptomatic patients and smoking and hypertension. Performing screening in patients with atherosclerosis of the abdominal aorta and/or lower limb arteries may detect significant carotid artery stenosis, requiring surgical intervention.
    Źródło:
    Polish Journal of Surgery; 2019, 91, 5; 5-11
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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