Download Dynamics of Rotors and Foundations by Erwin Krämer PDF

By Erwin Krämer

Rotordynamics are of serious significance within the layout, manufacture and meeting of turbomachines in addition to in making sure their secure operation. additionally very important are the dynamics of the basis and its interplay with the dynamics of the rotor. This e-book is split into 4 elements. Following a presentation of the fundamental concept the dynamics of rotors supported on numerous bearings. The 3rd half describes the dynamics of foundations of turbine line-outs and the calculations for a turbomachine coupled with its starting place. The final half encompasses a part on estimation methods, a complete presentation of the theoryand perform of rotors having a transverse crack, a piece at the mathematical basics and an outline of the pc software used for the examples within the booklet. The publication addresses either the sensible engineer and the theoretician and may offer brands, operators, college and polytechnic academics and scholars with an knowing of the vibrations of turbomachines. the implications are defined in the sort of approach that they are often simply understood and applied.

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Leffcott rotor. Amplitudes and angular velocity for startup with constant torque [19] Angu lar ve locity / Displacement Time - Fig. 11. As in Fig. 3 J effcott Rotor with Flexible Bearings Up to now in this chapter the bearings supporting the rotor have been assumed to be rigid . The bearings of real shafts are more or less flexible and have their special dynamic characteristics. These will be investigated in more detail in Chapters 6 and 7. 30 3 Shaft with Central Disc In this section it will simply be assumed that a bearing can be replaced by massless springs in two mutually perpendicular radial directions (preferably horizontal and vertical).

4 Jeffcott Rotor with Bearing Damping 35 Accordingly, the model usually has one natural frequency w, but not with all parameters. The real part of the eigenvalue is always negative, so that the natural motion usually consists of one damped natural vibration and one slowly decaying displacement. In special cases there are three such displacements with different decay constants. Fig. 18 shows the non-dimensional natural frequencies as functions of non-dimensional bearing stiffness, for different bearing damping.

For an insufficient torque the rotor does not emerge from the critical region, it "stays suspended" (Fig. 11). Reference [19] contains charts, from which the behaviour can be numerically portrayed. In [20], it is shown that one can calculate the behaviour of a realistic rotor, using the results for a leffcott rotor found in reference [19]. 3 Jeffcott Rotor with Flexible Bearings 29 Angular velocity Fig. 10. leffcott rotor. Amplitudes and angular velocity for startup with constant torque [19] Angu lar ve locity / Displacement Time - Fig.

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