...Darren E. Holland; Bogdan I. Epureanu; Sergio Filippi To accurately predict the dynamics of most structures, a representation of damping must be used. This paper focuses on structural damping and the identification of structural damping for complex systems with cyclic symmetry such as bladed disks...

...Olguta Marinescu; Bogdan I. Epureanu; Mihaela Banu Predicting the influence of cracks on the dynamics of bladed disks is a very important challenge. Cracks change the structural response, which in turn changes the crack propagation characteristics. Hence, accurate and computationally effective...

...Stefano Bianchi; Alessandro Corsini; Franco Rispoli; Anthony G. Sheard This study investigates the causal relationship between flow aerodynamics and radiated noise in low-speed axial fans. Using blades with three distinctive tip configurations, including two that were developed with a view...

...Akira Saito; Matthew P. Castanier; Christophe Pierre An efficient methodology for predicting the nonlinear forced vibration response of a turbine engine rotor with a cracked blade is presented and used to investigate the effects of the damage on the forced response. The influence of small random...

...Stefano Bianchi; Alessandro Corsini; Franco Rispoli; Anthony G. Sheard This paper presents the findings of an investigation on the use of several blade-tip configurations (modified by the addition of various end plates at the blade tip) for passive noise control in industrial fans. Utilizing...

...Hongbiao Yu; K. W. Wang For bladed-disk assemblies in turbomachinery, the elements are often exposed to aerodynamic loadings, the so-called engine order excitations. It has been reported that such excitations could cause significant structural vibration. The vibration level could become even more...

...Lee Gorny; Gary H. Koopmann Fan noise challenges noise control engineers in developing products ranging in scale from small ventilation systems to large turbomachines. The dominant noise source in many axial fans is the tonal noise due to rotor/stator interactions at the fundamental blade passing...

...Yi-Jui Chiu; Shyh-Chin Huang The influence on the coupled vibrations among shaft, disk, and blades of a rotor system due to a cracked blade was investigated analytically. On the shaft-disk-blade system, without a cracked blade, there exist three types of coupled modes, shaft disk blade (SDB), disk...

...Hongbiao Yu; K. W. Wang Extensive investigations have been conducted to study the vibration localization phenomenon and the excessive forced response that can be caused by mistuning in bladed disks. Most previous researches have focused on analyzing∕predicting localization or attacking...

... Instability for Pressurized Gas Bearings ,” ASME J. Basic Eng. Dec., pp. 511 – 520 . vibrations damping machine bearings turbomachinery blades rotors laminar flow turbulence hydrostatics flow instability L a s o ed er ve i en s s tud arg se ed ll s n r is rna ase Th nt nd line har...