scholarly journals Modal analysis of the coupled vibration in an aero-turbine compressor blisk considering both aerodynamic and centrifugal load

2019 ◽  
Vol 531 ◽  
pp. 012080
Author(s):  
H B Wang ◽  
W Zhang ◽  
M H Yao ◽  
M M Zhang
Keyword(s):  
Modal Analysis ◽  
Coupled Vibration ◽  
Centrifugal Load

Modal Analysis in Coupled Vibration of Serpentine Belt Drive System

2000 ◽  
Author(s):  
Jean W. Zu ◽  
Lixin Zhang
Keyword(s):  
Exact Solution ◽  
Modal Analysis ◽  
Eigenfunction Expansion ◽  
Linear Analysis ◽  
The Other ◽  
Belt Drive ◽  
Entire System ◽  
Coupled Vibration ◽  
Serpentine Belt ◽  
Drive Systems

Abstract The modal analysis of linear prototypical serpentine belt drive systems is performed in this study. The entire system is divided into two subsystems: one with a single belt and its motion is not coupled to the rest of the system in the linear analysis; the other with the remaining components. The explicit exact characteristic equation for eigenvalues is derived, which does not use the iteration approach. The response of serpentine belt drive systems to arbitrary excitations is obtained as a superposition of orthogonal eigenfunctions. The exact solution without using eigenfunction expansion is derived when the excitations are non-resonance harmonic.

scholarly journals Coupled Vibration of Unshrouded Centrifugal Compressor Impellers. Part I: Experimental Investigation

2000 ◽  
Vol 6 (2) ◽  
pp. 101-113 ◽  
Author(s):  
Heinrich Hasemann ◽  
Dirk Hagelstein ◽  
Manfred Rautenberg
Keyword(s):  
Gas Turbines ◽  
Close Agreement ◽  
The Other ◽  
Experimental Investigations ◽  
Coupled Vibration ◽  
Frequency Range ◽  
High Rotational Speed ◽  
Centrifugal Load ◽  
Blade Vibrations ◽  
Highly Loaded

The increased use of small gas turbines and turbochargers in different technical fields has led to the development of highly-loaded centrifugal compressors with extremely thin blades. Due to the high rotational speed and the corresponding centrifugal load, the shape of the impeller hub must also be optimized. This has led to a reduction of the thickness of the impeller disc in the outlet region. The thin parts of the impeller are very sensitive and may be damaged by the excitation of dangerous blade vibrations.dangerous blade vibrations. Experimental investigations by means of holographic interferometry and telemetry were carried out for two different impeller types; one with radial-ending blades and the other with backswept blades. The results presented in Part I of the paper are able to explain the dominance of coupling effects between the blades and the disc in the middle and higher frequency range of the two tested impellers. Especially excitations caused by downstream sources such as vaned diffusers can endanger the blades and the impeller.The finite element (FE) code computations presented in Part II of the paper to investigate the coupled vibration behavior of the whole impeller were found to be in close agreement with the experimental results.

Modal Analysis of Turbulent Flow near an Inclined Bank–Longitudinal Structure Junction

2021 ◽  
Vol 147 (3) ◽  
pp. 04020100
Author(s):  
Nasser Heydari ◽  
Panayiotis Diplas ◽  
J. Nathan Kutz ◽  
Soheil Sadeghi Eshkevari
Keyword(s):  
Turbulent Flow ◽  
Modal Analysis ◽  
Longitudinal Structure

Effect of Bass Bar Tension on Modal Parameters of a Violin's Top Plate

2015 ◽  
Vol 39 (1) ◽  
pp. 145-149 ◽  
Author(s):  
Ewa B. Skrodzka ◽  
Bogumił B.J. Linde ◽  
Antoni Krupa
Keyword(s):  
Modal Analysis ◽  
Experimental Modal Analysis ◽  
Mode Shapes ◽  
Modal Parameters ◽  
Normal Value ◽  
Modal Damping

Abstract Experimental modal analysis of a violin with three different tensions of a bass bar has been performed. The bass bar tension is the only intentionally introduced modification of the instrument. The aim of the study was to find differences and similarities between top plate modal parameters determined by a bass bar perfectly fitting the shape of the top plate, the bass bar with a tension usually applied by luthiers (normal), and the tension higher than the normal value. In the modal analysis four signature modes are taken into account. Bass bar tension does not change the sequence of mode shapes. Changes in modal damping are insignificant. An increase in bass bar tension causes an increase in modal frequencies A0 and B(1+) and does not change the frequencies of modes CBR and B(1-).

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