...Patrick B. Lamas; Rodrigo Nicoletti The longitudinal periodicity of the rotating elements in a rotating machine can impose band gaps (modal spacing) on the frequency spectrum of the system. These band gaps are characterized by a large distance between two adjacent modes with a low vibrating...

... downstream of the compressor makes more complex the dynamic behavior of the whole system during transients, thus significantly increasing surge onset risk. The activity or the main goal is to obtain a suitable quantitative indicator capable to detect in advance surge inception by relying only on vibrational...

...Patrick B. Lamas; Rodrigo Nicoletti Modal spacing (band gaps) in the frequency spectrum of rotating machines can be imposed by geometric periodicity. By designing the rotor with a geometry that repeats periodically, we can impose to the vibration response of the rotor a modal “gap” considerably...

... the overall vibration of the combined rotor significantly in practice. This paper studies the modeling of the crack on the bolt and nonlinear dynamic behaviors of the cracked bolt-disk rotor system. The circumferential bolts with a transverse open crack are treated as several bar elements under the assumption...

...: Jerzy T. Sawicki. 22 06 2018 28 06 2018 Acoustic emission Burners Combustion Combustors Computational fluid dynamics Engines Experimental Finite element Flow induced vibration Fuels Modeling Periodic Thermoacoustics Unsteady Unsteady flows Vibration Wave propagation...

... lies solely with its authors. 1 Corresponding author. Manuscript received June 22, 2018; final manuscript received June 26, 2018; published online September 14, 2018. Editor: Jerzy T. Sawicki. 22 06 2018 26 06 2018 Structural dynamics Vibration Turbine wheels...

..., 2018. Editor: Jerzy T. Sawicki. 1 Corresponding author. References [1] Risken , H. , and Haken , H. , 1989 , The Fokker–Planck Equation , Vol. 18 , Springer , Berlin . [2] Sinha , A. , 1987 , “ Friction Damping of Random Vibration in Gas Turbine Engine Airfoils...

... to be obtained. Manuscript received June 22, 2018; final manuscript received June 25, 2018; published online September 14, 2018. Editor: Jerzy T. Sawicki. 22 06 2018 25 06 2018 Flow induced vibration Modeling Structural dynamics Vibration Flow induced noise The current...

... the machine as follows: (49) η o = E c y c l e M c y c l e Δ h i s Energy Energy conversion Gas turbine technology Heat recovery Modeling Power systems Temperature Thermal Thermodynamics Turbines Two-phase Vibration Over the past...

... , K. , 1999 , “ PC-Based Analysis of Turbomachinery Vibration ,” Shock Vib. Dig. , 31 ( 6 ), pp. 449 – 454 . 10.1177/058310249903100602 [8] Rhode , D. L. , Hensel , S. J. , and Guidry , M. J. , 1992 , “ Labyrinth Seal Rotordynamic Forces Using a Three-Dimensional Navier-Stokes...

... and in steam up to 42 krpm are presented to demonstrate the performance of this bearing. It is shown to have low subsynchronous vibration and reasonable damping through rigid shaft critical speeds. 26 07 2017 30 08 2017 Aerospace applications Experimental Vibration Compliant foil...

... monitoring technique is spreading for health monitoring of the turbine blades. One of the main challenges of BTT method is identification of vibration parameters from one per revolution samples which is quite below Nyquist sampling rate. In this study, a new method for derivation of blade asynchronous...

.../1.4004130 Experimental Film Flow induced vibration Fluids Measurement techniques Modeling Structural dynamics Vibration Flow induced noise Bulkflow and computational fluid dynamics (CFD) methods are typically used to obtain the static and dynamic properties of seals. The development...

...M. J. Qu; G. Chen A finite element (FE) model of the rotor tester of an aero-engine, having a thin-walled casing structure, mounted with the way of an actual engine, is developed to simulate the intrinsic vibration characteristics under actual engine-mounting condition. First, a modal experiment...

..., M. C. C. , and Craig, R. R. , 1968 , “ Coupling of Substructures for Dynamic Analyses ,” AIAA J. , 6 ( 7 ), pp. 1313 – 1319 . 10.2514/3.4741 [2] Song , S. H. , Castanier , M. P. , and Pierre , C. , 2005 , “Multi-Stage Modeling of Turbine Engine Rotor Vibration,” ASME Paper...

... online April 10, 2018. Assoc. Editor: Jerzy T. Sawicki. 03 01 2017 12 10 2017 Design optimization Modeling Turbines Vibration The optimization of the rotordynamics of turbomachinery is an extensive subject. Urbiola-Soto et al. [ 1 ] provide a review of the many techniques...

... forced response functions (FRF) of the test case with a nominal damper are available for comparison. The comparison of different damper configurations offers a “high-level” validation of the pre-optimization procedure and highlights the strong influence of the blades mode of vibration on the damper...

... and bearing surface Experimental Film Vibration Electrical submersible pumps (ESPs), being long and flexible, are vulnerable to increases in synchronous vibration amplitude caused by modest changes in axial position [ 1 ]. Reliability is paramount for these pumps due to the high cost...

...Lidui Wei; Haijun Wei; Haiping Du; Shulin Duan To predict the vibration characteristics of the crankshaft of the larger marine diesel engine accurately and comprehensively, based on the finite element models of the crankshaft and the engine block reduced by a component mode synthesis (CMS) method...

.... References [1] Pflueger , M. , 2011 , “ Electrical Submersible Pump Survival Analysis ,” M.S. thesis, Texas A&M University, College Station, TX. [2] Durham , M. , Williams , J. , and Goldman , D. , 1990 , “ Effect of Vibration on Electric-Submersible-Pump Failures ,” SPE J. Pet...