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On the problem of vibration protection of rotor systems with elastic adaptive elements of quasi-zero stiffness

Klitnoi Volodymyr, Gaydamaka Anatoliy

Diagnostyka

2020

Vol. 21, No. 2

69--75

The analysis of scientific publications for rotor systems on the elastic supports made it possible to develop a basic version of the design scheme of active elastic support with controlled quasi-zero stiffness based on adaptive piezoceramic elements. The main components of the mathematical model of the functioning of active elastic supports with controlled quasi-zero stiffness based on adaptive piezoceramic elements are substantiated, which will help create the foundations of a theory for solving the problem of effective vibration protection. Numerical results show the possibility of effective applying of the proposed solution to the problem of rotor vibration damping.

Using of the long squeeze film dampers in rotor systems

Hlavon P., Houfek L.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

2003

nr 21

79-84

The present paper focuses on the issues of rotor systems with hydrodynamic dampers known as sąueeze film dampers (SFD), which are non-linear hydraulic binding elements between the rotor and stator. The hydrodynamic dampers, with maximum discharged layer, have recently been applied more and more often thanks to their favourable characteristics, mainly in the rotor systems of aircraft engines. In principal, the dampers decrease amplitude of the actuated oscillations, primarily when crossing the critical speed. They tend to shift the amplitude-frequency characteristic of the whole system to lower values due to the supplementary material of oil film, preventing thus the transmission of vibrations on to the machine frame and, in fact, reducing noisiness of the whole equipment.

Consideration of the character of excited vibration of rotor systems with disk-housing impacts

Zapomel J., Malenovsky E.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

2000

nr 13

353-356

Excessive lateral vibration results into impacts of the rotor on the stationary part. In this case the motion can have an unpredictable character. For its consideration forms of the nodes trajectories, Fourier spectrum, Poincare maps, attractor dimension and other means are possible to be applied.

Nadmierne drgania poprzeczne wywołujące uderzenia wirnika o część nieruchomą powodują, że ruch może mieć charakter nieprzewidywalny. Do zbadania charakteru drgań wzbudzonych zastosowano m.in. metodę kształtu trajektorii węzłów, transformatę Fouriera, mapę Poincarego.