Analysis of Cyclic Symmetric Structures with Mistuned Sectors

2002 ◽  
Author(s):  
Charles Seeley ◽  
Mehmet Dede ◽  
Qiang Liu ◽  
Marc Mignolet ◽  
OP Velagandula
Keyword(s):  
Cyclic Symmetric ◽  
Symmetric Structures

On the Use of the Ritz-Wilson Method for the Dynamic Response Analysis of Cyclic Symmetric Structures

1993 ◽  
Vol 164 (2) ◽  
pp. 193-206 ◽  
Author(s):  
P. Balasubramanian ◽  
J.G. Jagadeesh ◽  
H.K. Suhas ◽  
A.K. Srivastava ◽  
V. Ramamurti
Keyword(s):  
Dynamic Response ◽  
Response Analysis ◽  
Dynamic Response Analysis ◽  
Cyclic Symmetric ◽  
Symmetric Structures

Vibration Analysis of Aeroengine Compressor Blade-Disc Coupling System

2009 ◽  
Vol 16-19 ◽  
pp. 264-268 ◽  
Author(s):  
Wei Qiang Zhao ◽  
Yong Xian Liu ◽  
Mo Wu Lu
Keyword(s):  
Optimal Design ◽  
Dynamic Characteristics ◽  
Vibration Analysis ◽  
Compressor Blade ◽  
Analysis Method ◽  
Safety Verification ◽  
Coupling System ◽  
Characteristics Analysis ◽  
Cyclic Symmetric ◽  
Symmetric Structures

This paper introduces the FEA method for cyclic symmetric structures and makes an vibration characteristics analysis to a certain aeroengine compressor blade-disc coupling system based on this method. According to the anslysis results the dynamic characteristics of the blade-disc coupling system are discussed. The analysis method and results in this paper can be used for further study on optimal design and vibration safety verification for the blade-disc coupling system.

Lanczos method applied to the solution of eigenvalue problems of cyclic symmetric structures

1990 ◽  
Vol 34 (2) ◽  
pp. 349-353
Author(s):  
D.G. Mangsuli ◽  
V. Ramamurti
Keyword(s):  
Eigenvalue Problems ◽  
Lanczos Method ◽  
Cyclic Symmetric ◽  
Symmetric Structures

An equation solver for eigenvalue problems of cyclic symmetric structures

1987 ◽  
Vol 26 (4) ◽  
pp. 667-672 ◽  
Author(s):  
P. Balasubramanian ◽  
V. Ramamurti
Keyword(s):  
Eigenvalue Problems ◽  
Cyclic Symmetric ◽  
Symmetric Structures

SOME STUDIES ON FREE VIBRATION ANALYSIS OF CYCLIC SYMMETRIC STRUCTURES USING SUBSPACE METHOD

1993 ◽  
Vol 10 (3) ◽  
pp. 279-286
Author(s):  
P. BALASUBRAMANIAN ◽  
J.G. JAGADEESH ◽  
H.K. SUHAS ◽  
V. RAMAMURTI
Keyword(s):  
Free Vibration ◽  
Vibration Analysis ◽  
Free Vibration Analysis ◽  
Subspace Method ◽  
Cyclic Symmetric ◽  
Symmetric Structures

Free-vibration analysis of cyclic symmetric structures

1991 ◽  
Vol 7 (2) ◽  
pp. 131-139 ◽  
Author(s):  
P. Balasubramanian ◽  
J. G. Jagadeesh ◽  
H. K. Suhas ◽  
V. Ramamurti
Keyword(s):  
Free Vibration ◽  
Vibration Analysis ◽  
Free Vibration Analysis ◽  
Cyclic Symmetric ◽  
Symmetric Structures

Development of a Multi-Shaker-Control to Investigate the Influence of the Interblade Phase Angle on Frictionally Damped Turbine Blades

2021 ◽  
Author(s):  
Florian Jäger ◽  
Ferhat Kaptan ◽  
Lars Panning-Von Scheidt ◽  
Jörg Wallaschek
Keyword(s):  
Phase Angle ◽  
Phase Difference ◽  
Degrees Of Freedom ◽  
Turbine Blades ◽  
Mode Shapes ◽  
Nodal Diameter ◽  
Cyclic Symmetric ◽  
Symmetric Structures ◽  
Interblade Phase Angle ◽  
Experimental Effort

Abstract Constructive damper concepts are developed and integrated in turbomachinery to reduce vibration amplitudes generated by dynamic loads. The potential damping effectiveness of friction-based damper concepts is strongly dependent on the relative motion between adjacent blades, besides other factors such as normal force. In cyclic symmetric structures the phase difference is determined by the excited nodal diameter, which leads to different damper movements and efficiencies for given mode shapes. Several studies on the investigation of the damper performance of different underplatform damper geometries have been carried out on non-rotating test stands consisting usually of two blades in order to reduce the experimental effort before setting up rotational tests. Based on the existing modes of the two blades and the application of commonly just one shaker, the investigations are limited to the in-phase and out-of-phase modes. In this paper an experimental approach is developed to reduce the gap of transferability between non-rotating and rotational tests to analyze the effects of a variable interblade phase angle on the damping effect of underplatform dampers. For this purpose, a cascaded control system using two shakers is being developed to control the force amplitudes and the phase difference between the response of the two blades. The control algorithm is designed in a model-based way by using a two degrees of freedom oscillator with friction contact and is subsequently integrated in the non-rotating test stand.

A Study on the Application of Tuned Vibration Absorbers to Nominally Cyclic Structures

2019 ◽  
Author(s):  
Mainak Mitra ◽  
Andrea Lupini ◽  
Bogdan I. Epureanu
Keyword(s):  
Small Mass ◽  
Vibration Absorber ◽  
Vibration Absorbers ◽  
Lumped Mass ◽  
Absorption Mechanism ◽  
Vibration Absorption ◽  
Tuned Vibration Absorbers ◽  
Cyclic Symmetric ◽  
Stiffness And Damping ◽  
Symmetric Structures

Abstract The vibration absorber or tuned mass damper is a well-known mechanism, where a small mass connected to a larger structure is used to redirect vibration energy and provide reduction in vibration amplitudes at desired locations and frequencies. While tuned vibration absorbers have been widely applied for damping of mechanical systems, the concept remains largely unexplored in the design of dampers for bladed disks. This paper investigates whether such a vibration absorption mechanism is feasible for such nominally cyclic symmetric structures which are characterized by double modes, high modal density, and sensitivity to uncertainties such as mistuning. The single-degree of freedom vibration absorber concept is extended for application to this complex modal space, and lumped mass models are used for analysis. Trends in effectiveness of a vibration absorption based damper are explored by studying sensitivities to various parameters such as stiffness and damping at various locations. Effects of mistuning across sectors and locations of damper attachment are also considered. The results of the study establish the feasibility of the vibration absorption mechanism for application in blisks, and encourage further exploration of the concept, possibly in conjunction with other well-established damping mechanisms such as friction.

scholarly journals Multistability and localization in forced cyclic symmetric structures modelled by weakly-coupled Duffing oscillators

2019 ◽  
Vol 440 ◽  
pp. 202-211 ◽  
Author(s):  
A. Papangelo ◽  
F. Fontanela ◽  
A. Grolet ◽  
M. Ciavarella ◽  
N. Hoffmann
Keyword(s):  
Weakly Coupled ◽  
Cyclic Symmetric ◽  
Symmetric Structures ◽  
Coupled Duffing Oscillators

Efficient Analysis of Cyclic Symmetric Structures with Mistuning and Cracks

2019 ◽  
Author(s):  
Meng-Hsuan Tien ◽  
Tianyi Hu ◽  
Kiran D'Souza
Keyword(s):  
Cyclic Symmetric ◽  
Symmetric Structures
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