... (ESDs); (ii) safety relief valves and discharge lines, with possible CO 2 solidification; and (iii) vibrations due to extremely high density. For all these topics, specific challenges brought by the sCO 2 are described. The most meaningful results, in excellent agreement with predictions, are shown; key...

...Andrew Goldin; Onome Scott-Emuakpor; Tommy George; Brian Runyon; Richard Cobb The push for low cost and higher performance/efficient turbine engines has introduced a demand for novel technologies to improve robustness to vibrations resulting in high cycle fatigue (HCF). There have been many...

.... Editor: Joseph Zelina. Numerical investigation of the fluid-structure interaction between the combusting flow inside the combustion chamber, acoustics induced by the flame fluctuations, and liner walls vibrations has been performed. Three different geometries were analyzed numerically in order...

...Mihai Arghir; Manh-Hung Nguyen; David Tonon; Jérôme Dehouve In order to avoid contact between the vibrating rotor and the stator, annular seals are designed with a relatively large radial clearance (∼100 μm) and, therefore, have an important leakage. The floating ring annular seal is able to reduce...

... vibration and acoustic emission signals are collected from a gearbox dynamics testbed, where both healthy and faulty gears with different fault conditions are tested. To deal with the nonstationary nature of the wind turbine operation, a harmonic wavelet based method is utilized to extract the time...

... to take full advantage of the method. 03 05 2011 07 05 2011 09 01 2012 09 01 2012 blades damping discs (structures) fatigue friction mechanical contact shock absorbers torsion turbines vibrations The availability of advanced linear finite element codes...

...Loïc Salles; Laurent Blanc; Fabrice Thouverez; Alexander M. Gouskov; Pierrick Jean Contact interfaces with dry friction are frequently used in turbomachinery. Dry friction damping produced by the sliding surfaces of these interfaces reduces the amplitude of bladed-disk vibration. The relative...

... rotor bending vibrations coupled with a one-nodal (k = 1) blade system. Rotor-blade coupled bending conditions generally include two types so that the parallel and tilting modes of the shaft vibrations are respectively coupled with in-plane and out-of-plane modes of blade vibrations with a one-nodal...

...Thorsten Pfister; Philipp Günther; Florian Dreier; Jürgen Czarske Monitoring rotor deformations and vibrations dynamically is an important task for improving both the safety and the lifetime as well as the energy efficiency of motors and turbo machines. However, due to the high rotor speed...

... on the characterization of the mode is explored. 14 04 2011 19 04 2011 04 11 2011 04 11 2011 A significant amount of research has been conducted on the vibration response of bladed disks. An extensive review of this research was conducted by Castanier and Pierre [( 1 )]. Early work...

...) mechanical contact vibrations In this paper a new model reduction method for the analysis of nonlinear vibrations in structures with contact interfaces is developed. The intention is to create a simple and effective modification of the FRF matrix method. The method allows calculation of the high...

...Y.-J. Chan; D. J. Ewins It is known that small differences between nominally identical turbomachine blades, known as mistuning, can lead to significant variation in their vibration response levels. A commonly used term in mistuning studies called the “amplification factor” is clearly defined...

... 2010 22 03 2011 22 03 2011 aerospace engines damping frequency-domain analysis harmonics springs (mechanical) time-domain analysis vibrations Of all rotating machines that use squeeze-film damper (SFD) bearings, three-spool aero-engines can be considered as the most...

...Norihisa Anegawa; Hiroyuki Fujiwara; Osami Matsushita As is well known, zero and one nodal diameter ( k = 0 and k = 1 ) modes of a blade system interact with the shaft system. The former couples with torsional and/or axial shaft vibrations, and the latter with bending shaft vibrations. This paper...

...Paolo Pennacchi; Andrea Vania; Franco Frattaroli Rotating machines that include geared shaft-trains can be affected by a dynamic behavior that is influenced by coupling effects between lateral and torsional vibrations. These latter vibrations are rarely measured by means of permanent probes...

... aerodynamics blades compressors confined flow damping distortion mass transfer vibrations In terms of blade damping, studies have focused on the quantification of damping amplitudes and the contributions from material, mechanical and aerodynamic sources of damping. The experimental research...

... is associated with mistuning jump, which causes strong localization of the vibration response in a particular blade. The mistuning jump-localization phenomenon has been observed for all of the numerical examples, and it is also demonstrated that the highest response was always experienced by a blade...

...Changqing Bai; Hongyan Zhang; Qingyu Xu Ball bearings are important mechanical components in high-speed turbomachinery that is liable for severe vibration and noise due to the inherent nonlinearity of ball bearings. Using experiments and the numerical approach, the nonlinear dynamic behavior...

... by the fluctuating gas forces resulting in high vibration amplitudes, which can lead to high cycle fatigue failures. Hence, one of the main tasks in the design of turbomachinery blading is the reduction in the blade vibration amplitudes to avoid high dynamic stresses. Thus, coupling devices like underplatform...

... between eigenfrequencies and experimental natural frequencies. 06 05 2009 08 09 2009 16 04 2010 16 04 2010 boilers eigenvalues and eigenfunctions torsion turbogenerators vibrations rotordynamic model updating torsional vibrations natural frequencies During...