By Andrew D. Dimarogonas
The layout and building of rotating equipment working at supercritical speeds was once, within the Nineteen Twenties, an occasion of innovative significance for the then new department of dynamics often called rotor dynamics. within the Nineteen Sixties, one other revolution happened: In under a decade, imposed via operational and financial wishes, a rise within the strength of turbomachinery via one order of importance happened. Dynamic research of complicated rotor types turned a need, whereas the significance of approximate equipment for dynamic research used to be under pressure. ultimately, the emergence of fracture mechanics, as a brand new department of utilized mechanics, supplied analytical instruments to enquire crack effect at the dynamic habit of rotors.
The scope of this publication is predicated on a lot of these advancements. No themes on the topic of the well known classical difficulties are incorporated, relatively the ebook bargains solely with glossy high-power turbomachinery.
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Extra resources for Analytical Methods in Rotor Dynamics: Second Edition
In some cases similar effects may also be the result of fluid flow in labyrinth seals, oil flow properties, journal bearings, etc. . The Newkirk Effect, the vibration change due to thermal distortion of a rotor caused by rubbing on stationary components was studied analytically by Dimarogonas . The static bow due to an arbitrary heat input was found from a convolution integral of a source bow function and a heat function. Utilizing the dynamic response of the system, the resulting dynamic bow was computed.
8 Summary and Conclusions Dunkerley’s procedure, based on a simple empirical rule for a direct approximation to the fundamental flexural eigenfrequency of vibrating shafts, can be generalized and combined with certain algebraic devices to provide approximate solutions for the eigenfrequencies corresponding to any mode for any linear vibrating elastic system. 8 Summary and Conclusions 21 whose eigenfrequencies differ considerably from each other. However, by applying Graeffe’s method and the root-squaring process, the accuracy of approximation can be increased at will, while the computational effort remains small.
Journal bearings. Nonlinear Dyn. 67(2), 1201–1219, (2012) 33. Lu Y. , Ji, L. , Zhang, Y. , Liu, Y. : Dynamic behaviours of the rotor non-linear system with fixed-tilting-pad journal bearings support. In: Proceedings of the Institution of Mechanical Engineers, Part J: J. Eng. Tribol. 224(10), 1037–1047, (2010) 34. : Investigation of rotor blade structural dynamics and modeling based on measured airloads. J. Aircr. 45(5), 1631–1642 (2007) 35. : Flight dynamics of an articulated rotor helicopter with an external slung load.
Analytical Methods in Rotor Dynamics: Second Edition by Andrew D. Dimarogonas