...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...

... vibration Vibration Flow induced noise In turbomachinery, randomly distributed factors, as the airflow, cause a random excitation of bladed disks, which have generally a nonlinear mechanical behavior. In the design process of such bladed disks, one uses mainly deterministic methods, linearized...

... vibration Modeling Structural dynamics Vibration Flow induced noise 22 06 2018 25 06 2018 Manuscript received June 22, 2018; final manuscript received June 25, 2018; published online September 14, 2018. Editor: Jerzy T. Sawicki. The baseline structure of the BFM developed...

... Combustion Combustors Computational fluid dynamics Engines Experimental Finite element Flow induced vibration Fuels Modeling Periodic Thermoacoustics Unsteady Unsteady flows Vibration Wave propagation Flow induced noise Combustion 22 06 2018 28 06 2018 Manuscript...

...; published online September 14, 2018. Editor: Jerzy T. Sawicki. 22 06 2018 26 06 2018 Structural dynamics Vibration Turbine wheels of ship Diesel engine turbocharger applications are known to be prone to low engine order excitations (LEO) of fundamental blade modes...

... Energy conversion Gas turbine technology Heat recovery Modeling Power systems Temperature Thermal Thermodynamics Turbines Two-phase Vibration 03 01 2018 16 05 2018 Contributed by the Structures and Dynamics Committee of ASME for publication in the J OURNAL OF E NGINEERING...

... . Manuscript received September 26, 2017; final manuscript received October 27, 2017; published online May 14, 2018. Editor: David Wisler. 26 09 2017 27 10 2017 Computational fluid dynamics Flow induced vibration Internal flow Swirling Vibration Flow induced noise Labyrinth...

... 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. 1 Corresponding author. Contributed by the Vehicular and Small Turbomachines Committee of ASME...

... 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...

... as computational power in computers rapidly increases [ 12 ]. Experimental Film Flow induced vibration Fluids Measurement techniques Modeling Structural dynamics Vibration Flow induced noise 20 03 2017 01 11 2017 Contributed by the Structures and Dynamics Committee of ASME...

... Finite element methods Gas turbine technology Modeling Structural dynamics Vibration Computational modeling and numerical analysis are important tools for determining the structural characteristics of turbomachinery. Current modeling methodologies typically focus on single stage analysis...

...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...

... 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...

... would likely deliver improved results. Electrical submersible pumps rely on precise axial positioning to improve pump reliability by reducing excessive amplitudes of rotor vibration. The paper provides a first effort to demonstrate the viability of HTBs for application to ESPs, albeit falling...

...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...