scholarly journals Design and Performance Evaluation of MR Damper for the Reducing Vibration of a Flexible Pipe Conveying Fluid

2013 ◽  
Vol 14 (5) ◽  
pp. 2100-2105
Author(s):  
Woo-Cheul Park ◽  
Hyun-Chang Lee
Keyword(s):  
Performance Evaluation ◽  
Mr Damper ◽  
Pipe Conveying Fluid ◽  
Flexible Pipe ◽  
And Performance ◽  
Conveying Fluid

Flutter instabilities of cantilevered piezoelectric pipe conveying fluid

2019 ◽  
Vol 30 (4) ◽  
pp. 606-617 ◽  
Author(s):  
Gang Wang ◽  
Jinwei Shen
Keyword(s):  
Electromechanical Coupling ◽  
Piezoelectric Materials ◽  
Fluid Velocity ◽  
Pipe Conveying Fluid ◽  
Performance Predictions ◽  
Parametric Studies ◽  
Cycle Oscillation ◽  
And Performance ◽  
The Galerkin Method ◽  
Conveying Fluid

In this article, a nonlinear model was developed for a cantilevered piezoelectric pipe conveying fluid that included geometric nonlinearity and electromechanical coupling. The Galerkin method discretized the system in order to characterize its behavior. Critical flutter velocity and its associated unstable mode can be determined based on linear analysis. Due to the presence of piezoelectric materials, the critical flutter velocity depends on the resistive piezoelectric damping and electromechanical coupling. This added resistive piezoelectric damping tends to decrease the flutter velocity. Comprehensive simulations were also conducted to characterize the post-flutter behaviors. System parameters including amplitude, deformed pipe shape, and collected voltage in piezoelectric materials were calculated. The system will undergo limited cycle oscillation when the fluid velocity passes the flutter velocity. Parametric studies were conducted as well to investigate the system responses under different flow velocities. Physical insights can be collected from these simulation results to conduct piezoelectric pipe design and performance predictions for future pipe vibration control and energy harvesting applications.

444 Beating Phenomena of Nonplanar Vibration of a Flexible Pipe Conveying Fluid

2003 ◽  
Vol 2003 (0) ◽  
pp. _444-1_-_444-6_
Author(s):  
Jun AGATA ◽  
Kiyotaka YAMASHITA ◽  
Masatsugu YOSHIZAWA
Keyword(s):  
Pipe Conveying Fluid ◽  
Flexible Pipe ◽  
Nonplanar Vibration ◽  
Conveying Fluid

scholarly journals Buckling and Postbuckling Behavior of a Flexible Pipe Conveying Fluid

1985 ◽  
Vol 28 (240) ◽  
pp. 1218-1225 ◽  
Author(s):  
Masatsugu YOSHIZAWA ◽  
Hiroyoshi NAO ◽  
Eiji HASEGAWA ◽  
Yasushi TSUJIOKA
Keyword(s):  
Pipe Conveying Fluid ◽  
Postbuckling Behavior ◽  
Flexible Pipe ◽  
Conveying Fluid

scholarly journals Lateral vibration of a flexible pipe conveying fluid with pulsating flow.

1985 ◽  
Vol 51 (471) ◽  
pp. 2828-2836
Author(s):  
Masatsugu YOSHIZAWA ◽  
Eiji HASEGAWA ◽  
Hiroyoshi NAO ◽  
Yasushi TSUJIOKA
Keyword(s):  
Pulsating Flow ◽  
Pipe Conveying Fluid ◽  
Lateral Vibration ◽  
Flexible Pipe ◽  
Conveying Fluid

Experimental determination of time lag due to phase shift on a flexible pipe conveying fluid

Measurement ◽  
2016 ◽  
Vol 83 ◽  
pp. 86-95 ◽  
Author(s):  
B.R. Binulal ◽  
Akash Rajan ◽  
M. Unnikrishnan ◽  
Jayaraj Kochupillai
Keyword(s):  
Phase Shift ◽  
Experimental Determination ◽  
Time Lag ◽  
Pipe Conveying Fluid ◽  
Flexible Pipe ◽  
Conveying Fluid

Nonlinear Dynamics of an Extensible Flexible Pipe Conveying Fluid and Subjected to External Axial Flow

2011 ◽  
Author(s):  
F. A. Ghaith ◽  
Y. A. Khulief
Keyword(s):  
Nonlinear Equations ◽  
Linear Models ◽  
Numerical Solutions ◽  
Plug Flow ◽  
Axial Flow ◽  
Internal Flow ◽  
External Flow ◽  
Pipe Conveying Fluid ◽  
Flexible Pipe ◽  
Conveying Fluid

In this paper, the nonlinear equations representing the dynamics of a slender flexible pipe conveying fluid and subjected to external axial flow are formulated using the extended Hamilton’s principle. The internal flow is assumed to be steady, fully developed turbulent and approximated by a plug flow, while the external flow is represented by the induced hydrodynamic forces associated with friction, hydrostatic and inviscid components. The pipe centerline is considered to be extensible, and hence two coupled nonlinear equations of motion associated with longitudinal and transverse displacements are derived to describe the dynamics of the system. The developed model takes into account the fluid pressurization force and the tension in the pipe, which may be externally applied or associated with the frictional forces. For verification purpose, comparisons were performed, wherein the developed formulation was reduced to some published linear models. Numerical solutions were obtained for a case study of a double-pipe heat exchanger, wherein the effects of internal flow, external flow, flowrate, and radial gap on the dynamic characteristics of the system were addressed.

Experimental Analysis and Performance Evaluation of Magnetorheological Damper under High Impact Load

2009 ◽  
Vol 79-82 ◽  
pp. 1387-1390
Author(s):  
Hao Jun Zhou ◽  
Jiong Wang ◽  
Su Xiang Qian ◽  
Xue Zheng Jiang
Keyword(s):  
Performance Evaluation ◽  
Experimental Analysis ◽  
Impact Load ◽  
Mr Damper ◽  
High Impact ◽  
Pressure Response ◽  
Flow Coefficient ◽  
Magnetorheological Damper ◽  
Acceleration Response ◽  
And Performance

Its primary purpose of this study is to provide a comprehensive investigation on its dynamic performance of MR damper under high impact load. A test had been firstly done in order to identify its high shear viscosity of MR fluid. Then, its thermal performance of MR damper under high impact load is analyzed in order to aid its structure design of MR damper intended for weapon recoil mechanisms applications and improve its performance of elimination of heat. Further, Experimental analysis and performance evaluation of MR damper under impact load have been done by numerical simulation and hardware-in-the-loop simulation, including its acceleration response and pressure response of back cavity under different flow coefficient and the same inputting current, and its acceleration response and pressure response of back cavity under the same flow coefficient and different inputting current. Based on these simulation results, the shear-thinning phenomena and its dynamic response under saturated input current are analyzed and some useful conclusions are made. Finally, experimental results indicated that the developed MR damper under high impact load can achieve a good controllability for recoil applications.

Critical weight of flexible pipe conveying fluid subjected to end moments

2012 ◽  
Vol 5 (2) ◽  
pp. 90-94
Author(s):  
Chainarong Athisakul ◽  
Boonchai Phungpaingam ◽  
Waraporn Chatanin ◽  
Somchai Chucheepsakul
Keyword(s):  
Pipe Conveying Fluid ◽  
Flexible Pipe ◽  
Critical Weight ◽  
Conveying Fluid

scholarly journals Method of Experimentally Identifying the Complex Mode Shape of the Self-Excited Oscillation of a Cantilevered Pipe Conveying Fluid

2021 ◽  
Author(s):  
Eisuke Higuchi ◽  
Hiroshi Yabuno ◽  
Kiyotaka Yamashita
Keyword(s):  
Steady State ◽  
Nonlinear Effects ◽  
Flow Speed ◽  
Pipe Conveying Fluid ◽  
Flexible Pipe ◽  
Complex Mode ◽  
Instability Phenomenon ◽  
Excited Vibration ◽  
Cantilevered Pipe ◽  
Conveying Fluid

Abstract The dynamics of a flexible cantilevered pipe conveying fluid have been researched for several decades. It is known that the flexible pipe undergoes self-excited vibration when the flow speed exceeds a critical speed. This instability phenomenon is caused by nonconservative forces. From a mathematical point of view, the system has a characteristic of non-selfadjointness and the linear eigenmodes can be complex and non-orthogonal to each other. As a result, such a mathematical feature of the system is directly related to the instability phenomenon. In this study, we propose a method of experimentally identifying the complex mode from experimentally obtained time histories and decomposing the linear mode into real and imaginary components. In nonlinear analysis, we show that the nonlinear effects of practical systems on the mode in the steady-state selfexcited oscillation are small. The real and imaginary components identified using the proposed method for experimental steady-state self-excited oscillations are compared with those obtained in the theoretical analysis, thus validating the proposed identification method.

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