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Wyszukujesz frazę "external effect" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
Experimental identification of rotating and stationary damping in a cracked rotor system with an offset disc
Autorzy:
Roy, Dipendra K.
Tiwari, Rajiv
Powiązania:
https://bibliotekanauki.pl/articles/140313.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
rotating (internal) damping
stationary (external) damping
gyroscopic effect
switching crack
unbalance
full-spectrum
Opis:
In the rotor system, depending upon the ratio of rotating (internal) damping and stationary (external) damping, above the critical speed may develop instability regions. The crack adds to the rotating damping due to the rubbing action between two faces of a breathing crack. Therefore, there is a need to estimate the rotating damping and other system parameters based on experimental investigation. This paper deals with a physical model based an experimental identification of the rotating and stationary damping, unbalance, and crack additive stiffness in a cracked rotor system. The model of the breathing crack is considered as of a switching force function, which gives an excitation in multiple harmonics and leads to rotor whirls in the forward and backward directions. According to the rotor system model considered, equations of motion have been derived, and it is converted into the frequency domain for developing the estimation equation. To validate the methodology in an experimental setup, the measured time domain responses are converted into frequency domain and are utilized in the developed identification algorithm to estimate the rotor parameters. The identified parameters through the experimental data are used in the analytical rotor model to generate responses and to compare them with experimental responses.
Źródło:
Archive of Mechanical Engineering; 2019, LXVI, 4; 447-474
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of identification procedure for the internal and external damping in a cracked rotor system undergoing forward and backward whirls
Autorzy:
Roy, Dipendra Kumar
Tiwari, Rajiv
Powiązania:
https://bibliotekanauki.pl/articles/139607.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
internal damping
external damping
gyroscopic effect
switching crack
unbalance
full-spectrum
tłumienie wewnętrzne
tłumienie zewnętrzne
efekt żyroskopowy
zmieniające się pęknięcie
brak równowagi
pełne spektrum
Opis:
In the present work, a procedure for the estimation of internal damping in a cracked rotor system is described. The internal (or rotating) damping is one of the important rotor system parameters and it contributes to the instability of the system above its critical speed. A rotor with a crack during fatigue loading has rubbing action between the two crack faces, which contributes to the internal damping. Hence, internal damping estimation also can be an indicator of the presence of a crack. A cracked rotor system with an offset disc, which incorporates the rotary and translatory of inertia and gyroscopic effect of the disc is considered. The transverse crack is modeled based on the switching crack assumption, which gives multiple harmonics excitation to the rotor system. Moreover, due to the crack asymmetry, the multiple harmonic excitations leads to the forward and backward whirls in the rotor orbit. Based on equations of motions derived in the frequency domain (full spectrum), an estimation procedure is evolved to identify the internal and external damping, the additive crack stiffness and unbalance in the rotor system. Numerically, the identification procedure is tested using noisy responses and bias errors in system parameters.
Źródło:
Archive of Mechanical Engineering; 2019, LXVI, 2; 229-255
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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