Pulsating Flow Induced Vibration in the Seal System

2014 ◽  
Vol 602-605 ◽  
pp. 642-645
Author(s):  
Nan Zhang
Keyword(s):  
Fluid Flow ◽  
Nonlinear Models ◽  
Point Of View ◽  
The Self ◽  
Oscillating Flow ◽  
Nonlinear Phenomena ◽  
Flow Induced Vibration ◽  
Nonlinear Characteristics ◽  
Unbalanced Rotor ◽  
Excited Vibration

The oscillating flow is an important factor affecting the performance of the rotor–seal system. From the point of view of flow induced vibration, the nonlinear models of the rotor-seal system are presented for the analysis of the self-excited vibration, which is induced by interaction between the unstable seal fluid flow and the vibrating rotor. The nonlinear characteristics of flow induced vibration in the rotor-seal system are analyzed, and the nonlinear phenomena in the unbalanced rotor-seal system are investigated using the nonlinear model with the flow induced vibration.

Flow Induced Vibration in the Seal System

2014 ◽  
Vol 644-650 ◽  
pp. 390-393
Author(s):  
Nan Zhang
Keyword(s):  
Fluid Flow ◽  
Nonlinear Models ◽  
Point Of View ◽  
The Self ◽  
Oscillating Flow ◽  
Nonlinear Phenomena ◽  
Flow Induced Vibration ◽  
Nonlinear Characteristics ◽  
Unbalanced Rotor ◽  
Excited Vibration

The oscillating flow is an important factor affecting the performance of the rotor–seal system. From the point of view of flow induced vibration, the nonlinear models of the rotor-seal system are presented for the analysis of the self-excited vibration, which is induced by interaction between the unstable seal fluid flow and the vibrating rotor. The nonlinear characteristics of flow induced vibration in the rotor-seal system are analyzed, and the nonlinear phenomena in the unbalanced rotor-seal system are investigated using the nonlinear model with the flow induced vibration.

scholarly journals Dynamic Characteristics of Flow Induced Vibration in a Rotor-Seal System

2011 ◽  
Vol 18 (1-2) ◽  
pp. 139-146 ◽  
Author(s):  
Nan Zhang ◽  
Ying Liu ◽  
Fulei Chu
Keyword(s):  
Fluid Flow ◽  
Dynamic Characteristics ◽  
Nonlinear Models ◽  
Point Of View ◽  
Nonlinear Phenomena ◽  
Flow Induced Vibration ◽  
Nonlinear Characteristics ◽  
Fluid Force ◽  
Synchronization Phenomenon ◽  
Unbalanced Rotor

Flow induced vibration is an important factor affecting the performance of the rotor-seal system. From the point of view of flow induced vibration, the nonlinear models of the rotor-seal system are presented for the analysis of the fluid force, which is induced by the interaction between the unstable fluid flow in the seal and the vibrating rotor. The nonlinear characteristics of flow induced vibration in the rotor-seal system are analyzed, and the nonlinear phenomena in the unbalanced rotor-seal system are investigated using the nonlinear models. Various nonlinear phenomena of flow induced vibration in the rotor-seal system, such as synchronization phenomenon and amplitude mutation, are reproduced.

Pulsating Flow Induced Vibration in a Rotor-Seal System

2012 ◽  
Vol 542-543 ◽  
pp. 66-69
Author(s):  
Nan Zhang
Keyword(s):  
Fluid Flow ◽  
Numerical Simulations ◽  
Flow Velocity ◽  
Nonlinear Models ◽  
Sine Wave ◽  
Point Of View ◽  
Pulsating Flow ◽  
Flow Induced Vibration ◽  
Matlab Simulink ◽  
Pulsating Fluid

The pulsating flow is an important factor affecting the performance of the rotor-seal system. From the point of view of pulsating flow induced vibration, the nonlinear models of the rotor-seal system with the pulsating fluid flow are established. Based on the numerical simulations by Matlab/Simulink, the characteristics of pulsating flow induced vibration with the flow velocity in a form of sine wave or/and a constant have been quantitatively analyzed. The investigation also demonstrates that the proposed models, from the point of view of pulsating flow induced vibration, can be effectively applied to the analysis of the rotor-seal system.

A Review of Flow-Induced Vibration of Two Circular Cylinders in Crossflow

1986 ◽  
Vol 108 (4) ◽  
pp. 382-393 ◽  
Author(s):  
S. S. Chen
Keyword(s):  
Fluid Flow ◽  
Flow Field ◽  
Dynamic Response ◽  
Flow Regimes ◽  
Circular Cylinders ◽  
Future Research ◽  
Research Needs ◽  
Flow Induced Vibration ◽  
Excited Vibration ◽  
Staggered Arrangement

The flow field around a pair of rigid circular cylinders is very complex and has been studied extensively. When either one or both cylinders vibrate, the flow field becomes significantly more complicated because of the interaction of the fluid flow and the cylinder motion. This paper presents an overview of the problem including different flow regimes, vortex-excited vibration, and fluidelastic instability for two cylinders in tandem, two cylinders side by side and two cylinders in staggered arrangement. A general formulation to study dynamic response under different conditions is outlined and future research needs are discussed.

scholarly journals Influence of Elastomeric Bearings in Tension on the Seismic Performance of Base-Isolated r.c. Buildings

2020 ◽  
Vol 11 (1) ◽  
pp. 82
Author(s):  
Fabio Mazza ◽  
Mirko Mazza
Keyword(s):  
Base Isolation ◽  
Nonlinear Models ◽  
Vertical Component ◽  
Computer Code ◽  
Nonlinear Phenomena ◽  
Isolation System ◽  
Elastomeric Bearings ◽  
Near Fault ◽  
Base Isolation System ◽  
Near Fault Earthquakes

Elastomeric bearings are commonly used in base-isolation systems to protect the structures from earthquake damages. Their design is usually developed by using nonlinear models where only the effects of shear and compressive loads are considered, but uncertainties still remain about consequences of the tensile loads produced by severe earthquakes like the near-fault ones. The present work aims to highlight the relapses of tension on the response of bearings and superstructure. To this end, three-, seven- and ten-storey r.c. framed buildings are designed in line with the current Italian seismic code, with a base-isolation system constituted of High-Damping-Rubber Bearings (HDRBs) designed for three values of the ratio between the vertical and horizontal stiffnesses. Experimental and analytical results available in literature are used to propose a unified nonlinear model of the HDRBs, including cavitation and post-cavitation of the elastomer. Nonlinear incremental dynamic analyses of the test structures are carried out using a homemade computer code, where other models of HDRBs considering only some nonlinear phenomena are implemented. Near-fault earthquakes with comparable horizontal and vertical components, prevailing horizontal component and prevailing vertical component are considered as seismic input. Numerical results highlight that a precautionary estimation of response parameters of the HDRBs is attained referring to the proposed model, while its effects on the nonlinear response of the superstructure are less conservative.

The Investigation of the Influence of Structure Parameters on the Friction-Induced Self-Excited Vibration

2011 ◽  
Vol 66-68 ◽  
pp. 933-936
Author(s):  
Xian Jie Meng
Keyword(s):  
Nonlinear Dynamics ◽  
Numerical Method ◽  
Calculation Result ◽  
Dry Friction ◽  
Vibration Amplitude ◽  
The Self ◽  
Structure Parameters ◽  
Dynamics Model ◽  
Excited Vibration ◽  
Nonlinear Dynamics Model

A one degree of freedom nonlinear dynamics model of self-excited vibration induced by dry-friction was built firstly, the numerical method was taken to study the impacts of structure parameters on self-excited vibration. The calculation result shows that the variation of stiffness can change the vibration amplitude and frequency of the self-excited vibration, but can not eliminate it, Along with the increase of system damping the self-excite vibration has the weakened trend and there a ritical damping, when damping is greater than it the self-excite vibration will be disappeared.

Vídeo experimental e autorretrato

2021 ◽  
Author(s):  
Filomena Antunes Sobral ◽  
Daniela Morgado Oliveira
Keyword(s):  
Crucial Role ◽  
Point Of View ◽  
The Self ◽  
Self Awareness ◽  
Cindy Sherman ◽  
Artistic Creation ◽  
Multiple Variable ◽  
The Relationship ◽  
Theoretical Foundations ◽  
Creative Production

In the development of the relationship between the artist and his artistic creation, the deconstruction of concepts and ideas within the scope of artistic praxis leads to the reflection of the crucial role that the artist has in the conception and meaning of the work. His creative production, in turn, appropriates not only the expressive force of the author to assert itself as an artistic creation, but can also assume to be the reflection of the self, its identity and materializes in the form of self-portrait. The self-portrait expands the artist’s interiority, externalizing concerns and questions, and conveys a subjective point of view about himself and his view of art. But how does self-portrait contribute to self-awareness? And how does the artist reveal himself and communicate beyond his appearance?Based on these questions, the objective of this paper is to provide a reflection on self-portrait presenting the results of an artistic installation project that involved photographic language in the form of self-portrait and experimental video to represent feelings of disquiet. Influences such as Cindy Sherman, Lais Pontes or Francesca Woodman, whose creations approach the self-portrait in a not only original, but critical style, stand out.It is a project of academic and artistic nature supported by theoretical foundations. The results allow us to conclude that the artistic installation, which began by presenting a self-portraying self-seeking identity, frees itself from its creator to enhance multiple variable interpretations depending on the observer’s attention.

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