...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...

...-to-seal clearances to match the requirements of power output, efficiency, and operational life. Conversely, this design approach leads to stability issues [ 1 ]. Therefore, the prediction of labyrinth seals dynamics needs much more attention. Flow induced vibration Modeling Structural dynamics...

... Finite element Flow induced vibration Fuels Modeling Periodic Thermoacoustics Unsteady Unsteady flows Vibration Wave propagation Flow induced noise Combustion Can-annular combustors are common in heavy-duty land based gas turbines. In this design, the air flows from the compressor...

...] Ewins , D. J. , 1969 , “ The Effects of Detuning Upon the Forced Vibrations of Bladed Disks ,” J. Sound Vib. , 9 ( 1 ), pp. 65 – 79 . 10.1016/0022-460X(69)90264-8 [2] Jugde , J. , Pierre , C. , and Mehmed , O. , 2001 , “ Experimental Investigation of Mode Localization and Forced...

... conversion Gas turbine technology Heat recovery Modeling Power systems Temperature Thermal Thermodynamics Turbines Two-phase Vibration Over the past years, the consumption of fossil fuel continues to grow [ 1 ] due to the increase in energy demand in both heat and electricity forms...

... Labyrinth Seal Inlet Swirl Velocity ,” ASME J. Vib. Acoust. , 112 ( 3 ), pp. 380 – 383 . 10.1115/1.2930519 [7] Kirk , R. G. , Raju , K. V. S. , and Ramesh , K. , 1999 , “ PC-Based Analysis of Turbomachinery Vibration ,” Shock Vib. Dig. , 31 ( 6 ), pp. 449 – 454 . 10.1177...

... 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. The tests of this initial prototype were conducted with the 24 krpm, low-speed test setup shown in Fig. 5...

... 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...

... and in-service wear. The need to understand the effects of mistuning is important since it has been shown that even for small levels of mistuning vibration localization can result. Due to the inherent randomness of mistuning, it must be studied stochastically with many mistuning realizations and levels. By being...

...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...

... not provide enough damping to stabilize the rotor [ 17 ]. Given that the case study rotor traverses its first critical speed, the critical speed must be located at a target value, and that synchronous rotor vibration as well as the rotordynamic instability are of importance, the four pad-LBP was selected...

... 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...

... OURNAL OF E NGINEERING FOR G AS T URBINES AND P OWER . Manuscript received July 31, 2017; final manuscript received September 11, 2017; published online February 27, 2018. Editor: David Wisler. 31 07 2017 11 09 2017 Experimental Film Vibration Electrical submersible...

...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...

...; published online January 17, 2018. Editor: David Wisler. 25 08 2017 25 09 2017 Equilibrium Finite element Finite element methods Fluids Modeling Structural dynamics Vibration Electric submersible pumps (ESPs) are widely used in oil production as dynamic pumps...