Temat: modal damping - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Experimental evaluation of the effects of structural changes on the vibration properties of ck35 steel
Autorzy:: Yazani, Navid Moshtaghi
Powiązania:: https://bibliotekanauki.pl/articles/1837938.pdf
Data publikacji:: 2021
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:: microstructure
spheroidization heat treatment
modal analysis
natural frequency
damping
Opis:: The microstructure of some components which operate in high-temperature conditions (e.g. boiler components, turbine blades used in gas power plants, jet engines and reactors) is subjected to changes in long run, which leads to a degradation in the mechanical properties of these components and consequently, reduces their lifecycle. Therefore, it is so useful to detect the changes in the microstructure of these parts during their operation, employing an easy, fast and non-destructive method to determine their remaining life. In this study, we evaluate the effects of the microstructural changes on natural frequencies and the damping coefficient of CK35 steel, employing the experimental modal test. We aim to use the method for power plant components, if it has significant effects. To do so, we applied spheroidization heat treatment on CK35 steel samples having a primary structure of ferrite-pearlite for 24 and 48 hours. Then, we carried out the experimental modal test on samples having different metallurgical structures, but with the same dimensions and weights. According to the findings, the spherical ferrite-carbide particles in the ferrite structure increase the natural frequencies and damping coefficient. These tests show that the structural changes in this type of steel result in slight changes in the values of natural frequencies; however, it significantly changes the damping frequencies.
Źródło:: Acta Mechanica et Automatica; 2021, 15, 2; 53-57
1898-4088
2300-5319
Pojawia się w:: Acta Mechanica et Automatica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Rozszerzenie możliwości zastosowania tłumienia modalnego w diagnostyce dużych obiektów
Widening the possibility of modal damping application to diagnostics of large objects
Autorzy:: Hoszwa, K.
Osiński, J.
Osipiak, M.
Żach, P.
Powiązania:: https://bibliotekanauki.pl/articles/328972.pdf
Data publikacji:: 2006
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:: tłumienie
analiza modalna
badanie
częstości własne
samochód
damping
modal analysis
test
modes
car
Opis:: W pracy przedstawiono możliwości zastosowania tłumienia modalnego w diagnostyce dużych obiektów, takich jak: nadwozia samochodów lub kadłuby obiektów pływających i latających. W opisie tłumienia wykorzystano warunek Caughe'ya. Kompozytowy dach samochodu Polonez Kombi przebadano metodą analizy modalnej. Model tłumienia z wykorzystaniem warunku Caughe'ya umożliwia rozprzęganie równań ruchu. Zastosowanie proponowanego modelu tłumienia umożliwia uzyskanie znacznie lepszego przybliżenia właściwości tłumiących struktury kompozytowej (w porównaniu z modelem Rayleigha).
The paper presents the possibility of model damping application to diagnostics of the large objects, such how: the body of cars or hulks of swimming and flying objects. Caughey condition is used in description of damping model. the composite roof of the car Polonez Kombi was investigated by Modal Analysis Method. Damping model used Caughey condition make possible decoupling of equations of movement. Application pf proposed damping model make possible getting better approximation of dissipative composite structure proprieties (comparatively by the Rayleigh model).
Źródło:: Diagnostyka; 2006, 1(37); 23-30
1641-6414
2449-5220
Pojawia się w:: Diagnostyka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Simulation of the frequency response of the ERC 1400 Bucket Wheel Excavator boom, during the excavation process
Autorzy:: Popescu, Florin Dumitru
Radu, Sorin Mihai
Andraș, Andrei
Kertesz (Brînaș), Ildiko
Powiązania:: https://bibliotekanauki.pl/articles/2064395.pdf
Data publikacji:: 2019
Wydawca:: STE GROUP
Tematy:: bucket wheel excavator
damping
frequency response
modal analysis
resonance
wielonaczyniowa koparka kołowa
tłumienie
pasmo przenoszenia
analiza modalna
rezonans
Opis:: The paper deals with the modal analysis and frequency response analysis of a bucket wheel excavator (BWE) boom, obtained by simulation, based on a virtual model of an existing BWE boom. The boom, which generally is realized as a spatial truss, is the most vulnerable subsystem of the BWE, being submitted to severe operational loads characterized by very pronounced cyclical, dynamic and stochastic variability. This vulnerability is the consequence of its shape and constructive parameters and the nature, source and character of the external exciting loads to which it is exposed. The classical approach recommended by standards and norms cannot predict the occurrence of failures caused by vibration, which produces fatigue due to the load’s cyclical variability and the deformation produced by resonant vibration of some constitutive elements. As exciting load we considered the operational forces acting on the bucket wheel. In this manner we can take into account the constructive features - with modal analysis, and the vibration regime - with frequency response analysis. The proposed method is useful both in the design phase of new load-bearing structures of truss type subjected to high-variability forces, and also in refurbishment or improvement phases of the existing structures of this kind.
Źródło:: New Trends in Production Engineering; 2019, 2, 1; 153--167
2545-2843
Pojawia się w:: New Trends in Production Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Vibration analysis of a bucket wheel excavator boom using rayleigh’s damping model
Autorzy:: Popescu, Florin Dumitru
Radu, Sorin Mihai
Kotwica, Krzysztof
Andraș, Andrei
Kertesz (Brînaș), Ildiko
Dinescu, Stela
Powiązania:: https://bibliotekanauki.pl/articles/2064357.pdf
Data publikacji:: 2019
Wydawca:: STE GROUP
Tematy:: bucket wheel excavator
damping
frequency response
modal analysis
resonance
wielonaczyniowa koparka kołowa
tłumienie
pasmo przenoszenia
analiza modalna
rezonans
Opis:: For the ERc 1400-30/7 type bucket wheel excavator (BWE) used in various Romanian open pit mines, a virtual model of the boom was constructed in SolidWorks. On this model, the variable in time forces acting during the excavation process were simulated, and the time history analysis (time response) was performed. This dynamic time response analysis was performed for excavation of homogenous material only, considering the damping as being of Rayleigh’s type, where the damping matrix is a linear combination of the mass and stiffness matrices. Based on the conducted analysis, the displacements of the boom during excavation were observed.
Źródło:: New Trends in Production Engineering; 2019, 2, 1; 233--241
2545-2843
Pojawia się w:: New Trends in Production Engineering
Dostawca treści:: Biblioteka Nauki

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