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Pozycja Propagation of the Lamellar Cracks.(Lodz University of Technology. Faculty of Mechanical Engineering. Department Division of Dynamics., 2014) Jaroniek, Mieczysław; Niezgodziński, TadeuszThe aim of the study is to include studying the effects of the interaction of lamellar cracks and their effect on the degradation of the structure. Lamellar cracking phenomenon is most common in the construction of welded ship hulls, bridges, pressure vessels and piping. The structures of these, as a result of errors in production and welding cracks. The sudden breakage occurs in the construction of real time, although they have been designed properly in terms of both the volume of the stress and strain. The growth of these cracks, at a rate equal to the speed of sound in the material, it is a sudden breakage.Pozycja Study of the Formation of Lamellar Cracks.(Lodz University of Technology. Faculty of Mechanical Engineering. Department Division of Dynamics., 2014) Jaroniek, Mieczysław; Niezgodziński, TadeuszIn rolled sheets, non-metallic inclusions are distributed along the thickness of the sheet as narrow lines running parallel to the rolling direction. Such inclusions are the nuclei of lamellar cracks. This work presents the application of the numerical method for study of lamellar cracking. Numerical models of samples with long artificial fissures set in the area of the sheet axis were studied along with other encountered inclusion distributions. Changes in the stress state in the area of the inclusion were observed as the load increased. Stress concentration leads to the formation of lamellar cracks - the joining of voids in the direction parallel to the exterior surface of the sheet (so-called "terraces" are formed) and at angles (so-called "jogs" are formed). The results of experimental tests were compared with the results of numerical calculations using the finite element method.Pozycja Experimental identification of dynamic parameters for active magnetic bearings.(Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2008) Kozanecka, Dorota; Kozanecki, Zbigniew; Lech, TomaszIn the paper, an experimental identification procedure of dynamic parameters for active magnetic bearings is presented. In the proposed method, analysis of variable components of displacements of the rotor for an excitation with the rotating vector force of unbalance, is conducted. Proportionality of the bearing magnetic response force to the excitation force in the whole range of rotational frequency, is assumed. It allows for identification of equivalent dynamic coefficients of the bearing. The experimental investigations were carried out on test rigs with the shaft supported in active magnetic bearings.Pozycja Badania eksperymentalne zaworu ciśnieniowego o zmodyfikowanej konstrukcji(Wydawnictwo Politechniki Łódzkiej, 2015) Olejnik, Maciej; Kosucki, AndrzejW artykule przedstawiono badania eksperymentalne dynamiki hydrostatycznego układu napędowego sterowanego rozdzielaczem, zasilanego pompą o stałej wydajności jednostkowej i wyposażonego w zawór ciśnieniowy o zmodyfikowanej konstrukcji. Przedstawiono schematy konstrukcyjny i ideowy zaworu i opisano zasadę jego działania. Badania przeprowadzone na eksperymentalnym stanowisku badawczym umożliwiły uzyskanie charakterystyk statycznych i dynamicznych zaworu zmodyfikowanego. Określono wpływ współczynnika dławienia oraz natężenia przepływu na działanie zaworu zmodyfikowanego. Przedstawiono także porównanie charakterystyk statycznych zaworu zmodyfikowanego i zaworu o zwyczajnej konstrukcji.