Download e-book for iPad: Robust Structural Design against Self-Excited Vibrations by Gottfried Spelsberg-Korspeter

By Gottfried Spelsberg-Korspeter

ISBN-10: 3642365515

ISBN-13: 9783642365515

ISBN-10: 3642365523

ISBN-13: 9783642365522

This e-book stories tools for a powerful layout of rotors opposed to self-excited vibrations. The prevalence of self-excited vibrations in engineering purposes if usually undesirable and in lots of circumstances tricky to version. taking into consideration advanced platforms akin to machines with many parts and mechanical contacts, it is very important have instructions for layout in order that the performance is powerful opposed to small imperfections. This ebook discusses the query on the best way to layout a constitution such that undesirable self-excited vibrations don't ensue. It exhibits theoretically and virtually that the outdated layout rule to prevent a number of eigenvalues issues towards the proper course and feature optimized buildings for that reason. This extends effects for the well known flutter challenge during which equations of movement with consistent coefficients ensue to the case of a linear conservative procedure with arbitrary time periodic perturbations.

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Nevertheless, for small angular velocities the gyroscopic terms are small and the periodic terms depend on a few parameters which in some cases will be small. If for example k1 − k2 is small and the same is true for the angular velocity, formulation (a) is most suitable to use the results of Chap. 2, where the gyroscopic terms and the time periodic terms can be seen as perturbations. Since gyroscopic and nonconservative terms are present in the equations, a stabilization can of course only be expected in the presence of damping.

1 Shells in Frictional Contact 51 Contact Forces The forces Fi originate from the frictional contacts and eventual elastic supports. In the simplest case, when they originate from massless friction pins, as shown in Fig. 1, they can be calculated from a force balance on the pin, as depicted in Fig. 2. In order to obtain the virtual work of the contact forces, the velocities of the contact points have to be derived. 15) . In order to calculate the virtual velocity of the material point on the shell currently in contact with the pad, the corresponding point on the neutral surface has to be determined, as can be seen in Fig.

The parameter ε 1 can be interpreted as a norm of multiple parameters depending linearly on ε and vanishing for ε = 0. In Chap. 17) helps to stabilize the system. This is done by setting δt = 0 and varying κt . e. the speed at which the trivial solution loses stability, as a function of κt . It can be clearly seen that the critical speed is minimal in the symmetric case (κt = 0), and increases significantly in the nonsymmetric case for |κt | > 1 %◦ . The stability boundary in Fig. 5 is in good agreement with the analytical approximation of the corresponding general two dimensional case in [73].

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Robust Structural Design against Self-Excited Vibrations by Gottfried Spelsberg-Korspeter

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