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Wyszukujesz frazę "Klimaszewski, S." wg kryterium: Autor

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    Tytuł:
    Identyfikacja stanu zdatności systemu
    Identification of the ability state of the system
    Autorzy:
    Jaźwiński, J.
    Klimaszewski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/327676.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    identyfikacja stanu
    cecha
    wymaganie
    zmienna losowa
    proces losowy
    identification of the state
    characteristic
    requirement
    random variable
    random process
    Opis:
    Pod pojęciem identyfikacji stanu zdatności systemu rozumiemy relacje C ∋ W (zbiór cech C zawiera się w zbiorze wymagań W). Cechy mogą być zdeterminowane - c, zmienne losowe - C, procesy losowe - C(t). Wymagania mogą być zdeterminowane - w, zmienne losowe W, procesy losowe W(t). Zbiór cech i zbiór wymagań wyznaczają dziewięć różnych relacji. W referacie omówiono wszystkie relacje, podając ich modele matematyczne oraz interpretację.
    Under the notion of identification of the ability state of the system we understand the relations C ∋ W (the set of characteristics C is included in the set of requirements W). The characteristics can be determined - c, random variables - C, random processes - C(t). The requirements can be determined - w, random variables W, random processes W(t). The set of characteristics and the set of requirements determine nine different relations. All the relations have been considered in the paper as well as their mathematical models and interpretation have been given.
    Źródło:
    Diagnostyka; 2006, 2(38); 159-166
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modified hagg and sankey metod to estimate the ballistic behaviour of lightweight metal/composite/ceramic armour and a fuselage skin of an aircraft
    Autorzy:
    Klimaszewski, S.
    Woch, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/247835.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    reliability
    ballistic shield
    bullets perforation
    Opis:
    Hagg and Sankey method assesses the functionality of containment rings, which prevent perforation of an aircraft's elements from turbine engine disc fragments after disc burst. However, the method assumption was based on studies of mechanism of destruction of ballistic shields made of among others ceramics, by small arms bullets. The hard ceramic facing of the ballistic shield blunts the projectile and breaks up the projectile's hard core used for armour piercing. As an impact result, a conoid of finely pulverized ceramic dust is formed, absorbing energy in the formation process. The dust, containing the remnants of the projectile's energy hits the backing, but is now spread over a larger area. With backings made of fibre, energy is absorbed in stretching, breaking and delamination. With backings made of ductile metal, energy is absorbed in elastic deformation. Modification of the method consisted of taking into account the stratification of the ceramic-metal composite and the occurrence of an aircraft stiffened skin, in order to better assess the effectiveness of ballistic shields. The concept of estimating the resistance was based on the described destruction mechanism, where the object of analysis is a metal containment ring with an additional ceramic protective ballistic shield. A comparison of two scenarios- with and without an additional 2 mm aluminum alloy skin was taken into account. For this particular scenario, results were sufficient for both of the two analyzed endurance criteria.
    Źródło:
    Journal of KONES; 2012, 19, 2; 245-252
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Fatigue Life Assessment of PZL-130 Orlik Structures Based on Historical Usage Data
    Autorzy:
    Leski, A.
    Klimaszewski, S.
    Kurdelski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/97857.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    aircraft structure
    fatigue
    usage profile
    Opis:
    Material fatigue is the basic factor limiting aircraft's durability. It comes from the fact that changing loads affect aircraft structure as well as from the fact that aircraft’s mass restrictions do not allow for diminishing stress to the level when material fatigue does not occur. Estimating fatigue durability of a particular structure as well as its actual fatigue damage degree is possible when the history of loads affecting the structure is known. Accuracy of loads monitoring influences the accuracy of indicated fatigue wear. In case of older structures, which have been maintained according to safe life principle, the number of hours have been commonly used as a fatigue wear indicator. After aircraft structure reaches flying time estimated by the produces, it is considered as fatigue wear and it is no longer in service. In case of a lack of results of loads spectrum measurements, results of tests conducted for other aircraft (of similar structure and assignment) can be used. For this purpose, average loads spectrum has been elaborated for particular aircraft groups, for example, HELIX, FELIX, FALSTAFF, ENSTAFF, TWIST(10). In the case of small aircraft, the data from FAA (2) report have been often used. This article describes the way of fatigue wear estimation for PZL-130 Orlik aircraft on the basis of historical data from flight recorders.
    Źródło:
    Fatigue of Aircraft Structures; 2009, 1; 131-139
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A probabilistic method of determining fatigue life of a structural component using the paris formuła and the probability density function of time of exceeding the boundary condition - an outline
    Autorzy:
    Tomaszek, H.
    Klimaszewski, S.
    Zieja, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/245569.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    fatigue life
    density function
    fatigue cracking
    Opis:
    An attempt has been made to present a probabilistic method to determine fatigue life of an aeronautical structure's component by means of a density function of time a growing crack needs to reach the boundary condition. It has been assumed that in a component of a structure given consideration there is a small crack that grows due to fatigue load affecting it. After having reached the boundary value the component in question loses its usability. Time of the crack growth up to the boundary value is termed a fatigue life of the component. From the aspect of physics, the propagation of a crack within the component, if approached in a deterministic way, is described with the Paris 's relationship for m = 2. To model the fatigue crack growth a difference equation has been applied, from which the Fokker-Planck equation has been derived to be then followed with a density Junction of the growing crack. The in this way found density function of the crack length has been applied to find density Junction of time of reaching the boundary condition. This function has been used in the present paper to determine the randomly approached fatigue life of a component of a structure. The present paper has been prepared for the case there is coefficient m = 2 in the Paris formula. With the in the paper presented scheme, one can find fatigue life of the structure's component for the case m not equal to 2.
    Źródło:
    Journal of KONES; 2009, 16, 3; 431-438
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fatigue Cracks Detection using PZT Transducers under the Influence of Uncertain Environmental Factors
    Autorzy:
    Dziendzikowski, M.
    Klimaszewski, S.
    Dragan, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/97945.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    structural health monitoring
    PZT transducers
    fatigue cracks detection
    environmental factors compensation
    Opis:
    This paper presents technique for qualitative assessment of fatigue crack growth monitoring, utilizing guided elastic waves generated by the sparse PZT piezoelectric transducers network in the pitch – catch configuration. Two Damage Indices (DIs) correlated with the total energy received by a given sensor are used to detect fatigue cracks and monitor their growth. The indices proposed carry marginal signal information content in order to decrease their sensitivity with respect to other undesired non-controllable factors which may distort the received signal. The reason for that is to limit the false calls ratio which besides the damage detection capability of a system, plays a crucial role in applications. However, even such simplified damage indices can alter over a long term, leading to the misclassification problem. Considering a single sensing path, it is very difficult to distinguish whether the resultant change of DIs is caused by a damage or due to decoherence of these DIs. Therefore, assessment approaches based on threshold levels fixed separately for DIs obtained on each of the sensing paths, would eventually lead to a false call. An alternative approach is to compare changes of DIs for all sensing paths. Developing damage distorts the signal only for the sensing paths in its proximity. In order to decrease the misclassification risk, a method of compensating such DIs drift is proposed. The main features and damage detection capabilities of this method will be demonstrated by conducting a laboratory fatigue test of an aircraft panel. The proposed approach has been verified on a real structure during fatigue test of a helicopter tail boom.
    Źródło:
    Fatigue of Aircraft Structures; 2016, 8; 111-115
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identyfikacja potencjału operacyjnego operatora środka transportu
    Transport devices operator operation potential status identification
    Autorzy:
    Szpytko, J.
    Jaźwiński, J.
    Woźniak, D.
    Klimaszewski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/208633.pdf
    Data publikacji:
    2011
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    identyfikacja stanu operatora
    cecha
    wymaganie
    zmienna losowa
    proces losowy
    identification of the operator state
    characteristic
    requirements
    random variable
    random process
    Opis:
    Pod pojęciem identyfikacji stanu zdatności operatora środków transportu rozumiemy relacje C ⊂ W (zbiór cech C zawiera się w zbiorze wymagań W). Cechy mogą być zdeterminowane - c, zmienne losowe - C, procesy losowe - C(t). Wymagania mogą być zdeterminowane - w, zmienne losowe W, procesy losowe W(t). Zbiór cech i zbiór wymagań wyznaczają dziewięć różnych relacji. W artykule omówiono możliwe relacje, podając ich modele matematyczne oraz interpretację.
    Under the notion of identification of the ability state of the operator type transportation system we understand the relations C ⊂ W (the set of characteristics C is included in the set of requirements W). The characteristics can be: determined - c, random variables - C, random processes - C(t). The operation requirements of the man-device set can be: determined - w, random variables W, random processes W(t). The set of characteristics and the set of requirements determine nine different relations. All the relations have been considered in the paper, as well as their mathematical models and interpretation have been given.
    Źródło:
    Biuletyn Wojskowej Akademii Technicznej; 2011, 60, 1; 179-194
    1234-5865
    Pojawia się w:
    Biuletyn Wojskowej Akademii Technicznej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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