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Propozycja algorytmu projektowania wałów spajanych

100%

Pakowski R.

tom nr 10

26--28

Szybkoobrotowe waty maszynowe są powszechnie stosowanymi elementami przenoszenia mocy w wielu konstrukcjach. Współczesne technologie coraz częściej pozwalają na stosowanie wałów spajanych. Efektem stosowania takich rozwiązań jest uzyskanie układów o nieliniowych charakterystykach dynamicznych (sztywność i tłumienie). W artykule przedstawiono propozycję algorytmu projektowania wałów spajanych.

High-speed machine shafts are components of the power transmission widely used in many structures. Current technologies allow for using bonded shafts more frequently. The result of applying such solutions is obtaining systems of nonlinear dynamic characteristics (stiffness and dissipation). The paper presents proposal of algorithm of bonded shafts designing.

Model układu dynamicznego ze zmiennymi w czasie błędami osiowania

63%

Dąbrowski Z. , Pakowski R.

tom Vol. 36

85--88

W pracy przedstawiono wyniki modelowych badań wpływu charakterystyk sprzęgieł podatnych na odpowiedź dynamiczną układu w warunkach zmiennych w czasie błędów osiowania.

In article results of a model research of influence of flexible coupling characteristics on the system dynamic response under conditions of coaxiality errors changing in time were shown.

Coupled lateral-torsional vibrations of a symmetric rotor

51%

Chiliński B. , Pakowski R. , Stanik Z.

tom Vol. 23, No. 4

41--47

The paper presents a cross-sectional analysis of dynamics of rotating systems with different characteristics, starting from the search for solutions in an analytical way, and ending with the numerical attempt to verify the results. There is presented a problem of bending and torsional vibrations in rotational systems, using possibly the simplest model of the phenomenon. It is a heavy disk embedded on the deformable massless shaft. The rotor is symmetric and it is assumed that stiffness can be nonlinear. The analysis of vibrations occurring in rotors is made with the use of this model. This is followed by a preliminary discussion on the problem and the conclusions of the pilot studies. There are presented basic problems related to the phenomenon of lateral-torsional coupling in rotational systems with an emphasis on critical states. Formulation of the problem is the conclusion of preliminary part of the paper. Next, there are discussed the selected methods currently used to solve such problems, together with a discussion of their application in this case. In addition, there is discussed a problem of numerical or analytical character of obtained results and the range of using methods in modelling, designing and experimental studies. The next part of the paper focuses on the solution of the model presented in the introduction, using the following analytical or numerical methods: Krylov-Bogolubov, Adams and Runge-Kutta methods. There are presented assumptions, simplifications of the model, technical details of searching for solutions and the results together with a discussion of their correctness. The results, which were obtained from analysis, are polyharmonic. Due to this fact, the spectra of each solution were presented. These aspects are discussed in the context of the solving methods and motion analysis for rotor systems. The whole paper is summarized with a discussion of the results and their confrontation with reality.