Nonplanar Vibration of a Vertical Fluid-Conveying Pipe (Effect of Horizontal Excitation at the Upper End)

2014 ◽  
Vol 136 (4) ◽  
Author(s):  
Kiyotaka Yamashita ◽  
Hiroaki Furuya ◽  
Hiroshi Yabuno ◽  
Masatsugu Yoshizawa
Keyword(s):  
Limit Cycle ◽  
Excitation Frequency ◽  
Horizontal Direction ◽  
Pipe Conveying Fluid ◽  
Lateral Vibration ◽  
Ccd Cameras ◽  
Cycle Frequency ◽  
Excited Vibration ◽  
Nonplanar Vibration ◽  
Conveying Fluid

Nonlinear and nonplanar lateral vibration of a self-excited vertical cantilevered pipe conveying fluid is studied for the case that the upper end of the pipe is periodically excited in the horizontal direction. The modulation equations, which are coupled with nonlinear terms and govern the amplitudes and phases of nonplanar vibration, are analytically derived. When the excitation frequency is near the nonplanar limit cycle frequency, the nonplanar self-excited vibration is quenched to the excitation, and the amplitude of lateral vibration in the direction perpendicular to the horizontal excitation is decreased. Experiments were conducted and spatial pipe behaviors were observed using two CCD cameras. The theoretically predicted effects of horizontal excitation were confirmed qualitatively.

Nonlinear Stability of a Fluid-Conveying Cantilevered Pipe With End Mass in Case of Horizontal Excitation at the Upper End

2010 ◽  
Author(s):  
Hiroaki Furuya ◽  
Kiyotaka Yamashita ◽  
Hiroshi Yabuno
Keyword(s):  
Limit Cycle ◽  
Excitation Frequency ◽  
Internal Flow ◽  
Frequency Component ◽  
Single Frequency ◽  
Dynamic Features ◽  
Cycle Frequency ◽  
Excited Vibration ◽  
Cantilevered Pipe ◽  
The Stability

Nonplanar vibrations of a cantilevered pipe with an end mass is studied. We have already clarified the nonplanar vibrations with a single frequency component when the pipe conveys fluid whose velocity is slightly over the critical value, above which the lateral vibration of the pipe is self-excited due to the internal flow. Moreover, for the case that the upper end of the pipe is excited periodically in the horizontal direction, we have shown in the previous paper that the nonplanar limit cycle motions start complex spatial transients and settle down to stationary planar forced-excited vibration when the excitation frequency is near the nonplanar limit cycle frequency. The purpose of this paper is to examine the stability of the nonplanar pipe vibrations when the nonplanar self-excited pipe vibrations are subjected to the excitation at the upper end. A set of ordinary differential equations, which govern the amplitudes and phases of unstable mode vibration and contain the effect of excitation at the upper end are derived. Stability analysis of these equations clarifies the nonlinear interactions between nonplanar self-excited pipe vibrations and the forced excitation. Second, the experiments are conducted with a silicon rubber pipe conveying water, confirming the dynamic features of pipe vibrations for the horizontal excitation.

scholarly journals Nonplanar Vibration of a Pipe Conveying Fluid (In Case of an Asymmetrical Spring Supported End)

2003 ◽  
Vol 69 (688) ◽  
pp. 3141-3148 ◽  
Author(s):  
Kiyotaka YAMASHITA ◽  
Jun AGATA ◽  
Arata MOTOKI ◽  
Masatsugu YOSHIZAWA
Keyword(s):  
Pipe Conveying Fluid ◽  
Nonplanar Vibration ◽  
Conveying Fluid

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 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

Lateral Vibration of Nonrotating Drill Pipe Conveying Fluid in Vertical Holes

2003 ◽  
Author(s):  
Qun Zhang ◽  
Stefan Miska
Keyword(s):  
Theoretical Model ◽  
Significant Influence ◽  
Theoretical Study ◽  
Drilling Fluid ◽  
Drill Pipe ◽  
Fortran Program ◽  
Pipe Conveying Fluid ◽  
Lateral Vibration ◽  
Numerical Examples ◽  
Conveying Fluid

A theoretical study has been performed on the lateral vibration of non-rotating drillpipe interacted with drilling fluid in vertical holes. Particular attention is paid to the interaction between drillpipe and drilling fluid near drillpipe neutral point zone. A new theoretical model has been established. The interaction between drillpipe and drilling fluid is characterized in this model. Dimensional analysis has been conducted to generalize this model. An innovative numerical method has been developed to solve the eigensystem. A FORTRAN program has been developed to model the behavior of drillpipe conveying fluid in vertical holes. Several numerical examples are provided to show the influences of drilling fluid on drillpipe dynamics. Fluid is considered to be flowing downward inside pipe and upward in annulus simultaneously. Results show that drilling fluid has significant influence on drillpipe dynamics.

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.

scholarly journals Lateral vibration of a flexible pipe conveying fluid.

1986 ◽  
Vol 52 (474) ◽  
pp. 710-717
Author(s):  
Masatsugu YOSHIZAWA ◽  
Eiichiro MORITANI ◽  
Eiji HASEGAWA ◽  
Yasushi TSUJIOKA
Keyword(s):  
Pipe Conveying Fluid ◽  
Lateral Vibration ◽  
Flexible Pipe ◽  
Conveying Fluid

scholarly journals Lateral Vibration of a Flexible Pipe Conveying Fluid with Pulsating Flow

1986 ◽  
Vol 29 (253) ◽  
pp. 2243-2250 ◽  
Author(s):  
Masatsugu YOSHIZAWA ◽  
Hiroyoshi NAO ◽  
Eiji HASEGAWA ◽  
Yasushi TSUJIOKA
Keyword(s):  
Pulsating Flow ◽  
Pipe Conveying Fluid ◽  
Lateral Vibration ◽  
Flexible Pipe ◽  
Conveying Fluid
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