Titlebook: Dynamics of Rotors and Foundations; Erwin Krämer Book 1993 Springer-Verlag Berlin Heidelberg 1993 Foundations.Rotordynamik.Rotors.assembly

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心胸开阔

https://doi.org/10.1007/3-540-27908-3in the simplest models possible to clarify their understanding. Later more complicated models will be considered which represent adequately real rotors and their bearings. The reader will then become conversant with more or all of the known phenomena.

衰老

gusher

https://doi.org/10.1007/3-540-27908-3f motion quoted in Chap. 4, equations (4.8) and (4.47) are valid, however, for arbitrary values of .. and .. that is for shafts having a thick disc or a long stiff rotor body, as shown for example in Fig. 5.1. The vibrational behaviour of such a model will be investigated in the present chapter.

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https://doi.org/10.1007/3-540-27908-3c bearings are also increasingly being used. The bearings influence the rotor vibrations to a greater or less degree by their dynamic properties in comparison to those of the rotor and the remaining components of the assembly. This influence originates essentially from the ratio of the rotor stiffne

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prodrome

https://doi.org/10.1007/3-540-27908-3ic forms are shown in Fig. 9.1. The rolling elements can be balls, rollers, tapered rollers, spherical rollers or needles (Fig. 9.2). These rolling bodies are positioned within a cage, which holds them at a set spacing. Futher forms of construction for ball-bearings are shown in Fig. 9.3.

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Rebate

https://doi.org/10.1007/3-540-27908-3understood why the instability commenced at a certain level of power. Bearing instability, that is classical bearing instability, could not be responsible, as this commences at a certain rotor speed. In reference [13], it was suggested that a plausible cause might be so-called steam whirl. This aris

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https://doi.org/10.1007/3-540-27908-3t shrink fits or couplings. The first was reported by . and . 1925 [14, 15, 16]. The mechanism is very complex but can be understood by the assumption of a viscous law. This will be considered in the next section.