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Wyświetlanie 1-3 z 3
Tytuł:
Fault-tolerant tracking control for a non-linear twin-rotor system under ellipsoidal bounding
Autorzy:
Kukurowski, Norbert
Mrugalski, Marcin
Pazera, Marcin
Witczak, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/2124781.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
fault tolerant control
simultaneous fault
external disturbances
nonlinear system
robust fault estimation
fault detection
fault diagnosis
sterowanie tolerujące uszkodzenia
uszkodzenie równoczesne
zakłócenia zewnętrzne
układ nieliniowy
szacowanie błędu
wykrywanie uszkodzenia
diagnoza uszkodzenia
Opis:
A novel fault-tolerant tracking control scheme based on an adaptive robust observer for non-linear systems is proposed. Additionally, it is presumed that the non-linear system may be faulty, i.e., affected by actuator and sensor faults along with the disturbances, simultaneously. Accordingly, the stability of the robust observer as well as the fault-tolerant tracking controller is achieved by using the ℋ∞ approach. Furthermore, unknown actuator and sensor faults and states are bounded by the uncertainty intervals for estimation quality assessment as well as reliable fault diagnosis. This means that narrow intervals accompany better estimation quality. Thus, to cope with the above difficulty, it is assumed that the disturbances are over-bounded by an ellipsoid. Consequently, the performance and correctness of the proposed fault-tolerant tracking control scheme are verified by using a non-linear twin-rotor aerodynamical laboratory system.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2022, 32, 2; 171--183
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of selected point estimators of vibration signals for purposes of fault detection in rolling bearings
Autorzy:
Krol, Adrian
Fidali, Marek
Jamrozik, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/2146576.pdf
Data publikacji:
2020
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
vibration
analysis
bearings
defects
diagnosis
drgania
analiza
łożyska
uszkodzenia
diagnoza
Opis:
Most of machine breakdowns relate to bearing failures thus it is very important to diagnose bearing conditions. The main purpose of the study was to classify the condition of bearings and identify defective ones based on visual inspection and the values of classic parameters of the acceleration signal vibration, such as Peak, RMS, Kurtosis. The results were compared to parameters provided by the SPM method. All vibration parameters were estimated for high pass filtered signals where filters had following cut-off frequencies 0.5; 1, 2, 5 and 8 kHz. Bearings were tested on the laboratory test bench being built at the Silesian University of Technology. Based on the signal analysis and visual inspections it can be stated that there is agreement in the assessment of the conditions between the parameters of the SPM method and the Peak and RMS parameters. It was observed that the sensitivity to the existence of low-intensity defects increases when the vibration parameters are determined for signals in the band above 2kHz.
Źródło:
Vibrations in Physical Systems; 2020, 31, 2; art. no. 2020212
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the pavement performance
Autorzy:
Iwański, M.
Chomicz-Kowalska, A.
Powiązania:
https://bibliotekanauki.pl/articles/202404.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Marshall hammer
hydraulic press
road base
full-depth cold recycling technology
foamed bitumen
bitumen emulsion
durability
resistance to moisture damage
diagnosis
ubijak Marshalla
prasy hydrauliczne
technologia recyklingu pełnej głębokości na zimno
asfalt spieniony
bitumiczna emulsja
trwałość
odporność na uszkodzenia wilgoci
diagnoza
Opis:
This paper focuses on evaluation of two laboratory-based methods of compaction of foamed bitumen and bitumen emulsion mixes: impact compaction with a Marshall hammer and static compaction using a hydraulic press. The investigated compaction methods were assessed in terms of their impact on the physical and mechanical properties of produced laboratory specimens, including: air void content, indirect tensile strength before and after conditioning in water (ITSdry, ITSwet), tensile strength ratio (TSR), and indirect tensile stiffness modulus (ITSM) at 0°C, 10°C and 20°C. The statically compacted specimens attained higher levels of mechanical properties and resistance to moisture damage, which was associated with a lower content of air voids in the specimens formed using a hydraulic press. Authors present a calculation showing that a mechanistic design based on the laboratory static press compaction method leads to overestimation of fatigue cracking resistance of the road base.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 1; 97-105
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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