Axial Vibration Property of Periodic Pipe System Conveying Fluid

2009 ◽  
Vol 45 (09) ◽  
pp. 36 ◽  
Author(s):  
Dianlong YU
Keyword(s):  
Axial Vibration ◽  
Pipe System ◽  
Conveying Fluid

scholarly journals Influence of Dry Friction on the Dynamics of Cantilevered Pipes Conveying Fluid

2022 ◽  
Vol 12 (2) ◽  
pp. 724
Author(s):  
Zilong Guo ◽  
Qiao Ni ◽  
Lin Wang ◽  
Kun Zhou ◽  
Xiangkai Meng
Keyword(s):  
Flow Velocity ◽  
Friction Force ◽  
Dry Friction ◽  
Critical Flow Velocity ◽  
Pipe System ◽  
Pipes Conveying Fluid ◽  
Cantilevered Pipe ◽  
The Stability ◽  
Friction Parameters ◽  
Conveying Fluid

A cantilevered pipe conveying fluid can lose stability via flutter when the flow velocity becomes sufficiently high. In this paper, a dry friction restraint is introduced for the first time, to evaluate the possibility of improving the stability of cantilevered pipes conveying fluid. First, a dynamical model of the cantilevered pipe system with dry friction is established based on the generalized Hamilton’s principle. Then the Galerkin method is utilized to discretize the model of the pipe and to obtain the nonlinear dynamic responses of the pipe. Finally, by changing the values of the friction force and the installation position of the dry friction restraint, the effect of dry friction parameters on the flutter instability of the pipe is evaluated. The results show that the critical flow velocity of the pipe increases with the increment of the friction force. Installing a dry friction restraint near the middle of the pipe can significantly improve the stability of the pipe system. The vibration of the pipe can also be suppressed to some extent by setting reasonable dry friction parameters.

Improved Exact Solution for Axial FSI Model of Liquid-Pipes Considering Complex Constraints

2016 ◽  
Author(s):  
Yuanzhi Xu ◽  
Zongxia Jiao ◽  
Yaoxing Shang ◽  
Shuai Wu
Keyword(s):  
Exact Solution ◽  
Method Of Characteristics ◽  
Inertial Effects ◽  
Time Cost ◽  
Axial Vibration ◽  
Time Line ◽  
Pipe System ◽  
Practical Applications ◽  
Complex Constraints ◽  
Distributed Friction

The fluid-structure interaction (FSI) can be observed significantly in the axial vibration of the liquid-filled pipe system. When distributed friction was neglected, the model could be solved with an exact solution without numerical error, developed from the method of characteristics (MOC). Then time-line interpolations have been employed to reduce the high time cost and retain the accuracy, named as the improved exact solution. For the purpose of practical applications, series connection of double-pipes is discussed in this paper. And complex constraints, including elastic, damping and inertial effects at connections, are studied. Models and methods are validated by numerical cases.

Dynamic Response of the Pipe Conveying Fluid with the Pressure Pulsation

2015 ◽  
Vol 1094 ◽  
pp. 491-494 ◽  
Author(s):  
Hong Bo Zhai ◽  
Jian Jun Su ◽  
Xiao Min Yan ◽  
Wei Liu
Keyword(s):  
Dynamic Response ◽  
Pressure Pulsation ◽  
Fluid Pressure ◽  
Response Characteristic ◽  
Pipe Conveying Fluid ◽  
Hydraulic Power ◽  
Working Pressure ◽  
Pipe System ◽  
Output Pressure ◽  
Conveying Fluid

The dynamic response characteristic of the pipe conveying fluid was researched with the fluid pressure pulsation in this article. For some hydraulic power pipe system, formed the mathematic models and the transfer matrices of the main hydraulic elements based on the fluid network algorithm, deduced the calculation formulae of input-output pressure pulsation, gained the transitive relationship of the fluid flow pulsation and pressure pulsation, and then studied the pressure pulsation amplitude of the hydraulic power pipes with different working pressures. This study, which analyzed the dynamic response of the pipe conveying fluid and discussed the feasibility of increasing the working pressure, is valuable for the design and the application of the pipes conveying fluid.

EFFECTS OF TIP MASS ON STABILITY OF ROTATING CANTILEVER PIPE CONVEYING FLUID WITH CRACK

2010 ◽  
Vol 24 (15n16) ◽  
pp. 2609-2614 ◽  
Author(s):  
IN SOO SON ◽  
HAN IK YOON ◽  
SANG PIL LEE ◽  
DONG JIN KIM
Keyword(s):  
Angular Velocity ◽  
Equations Of Motion ◽  
Pipe Conveying Fluid ◽  
Mass Ratio ◽  
Critical Flow Velocity ◽  
Pipe System ◽  
Stability Maps ◽  
The Stability ◽  
Tip Mass ◽  
Conveying Fluid

In this paper, the dynamic stability of a rotating cantilever pipe conveying fluid with a crack and tip mass is investigated by numerical method. That is, the effects of the rotating the rotating angular velocity, the mass ratio, the crack and tip mass on the critical flow velocity for flutter instability of system are studied. The equations of motion of rotating pipe are derived by using the extended Hamilton's principle. The crack section of pipe is represented by a local flexibility matrix connecting two undamaged pipe segments. The crack is assumed to be in the first mode of fracture and always opened during the vibrations. Finally, the stability maps of the cracked rotating pipe system as a rotating angular velocity and mass ratio β are presented.

scholarly journals Flexural vibration property of periodic pipe system conveying fluid based on Timoshenko beam equation

2009 ◽  
Vol 58 (12) ◽  
pp. 8357 ◽  
Author(s):  
Shen Hui-Jie ◽  
Wen Ji-Hong ◽  
Yu Dian-Long ◽  
Wen Xi-Sen
Keyword(s):  
Timoshenko Beam ◽  
Flexural Vibration ◽  
Beam Equation ◽  
Pipe System ◽  
Timoshenko Beam Equation ◽  
Conveying Fluid

scholarly journals Resonance reliability and importance measure analysis of multi-span pipe conveying fluid embedded in temperature-varying matrix

2021 ◽  
Vol 39 (5) ◽  
pp. 1035-1042
Author(s):  
Nan WU ◽  
Qing GUO ◽  
Guojun TONG ◽  
Yongshou LIU
Keyword(s):  
Optimization Design ◽  
Dynamic Stiffness ◽  
Importance Measure ◽  
Pipe System ◽  
System A ◽  
Fluid Flow Velocity ◽  
Measure Analysis ◽  
Velocity Pressure ◽  
Conveying Fluid ◽  
Measurement Index

Pipe system conveying fluid faces the problem of multi-order resonance failure caused by broadband excitation. For solving above problem, the dynamic stiffness method is employed to solve the dynamic equations of multi-span pipes considering the temperature effect. Combining the obtained natural frequency and the rule of resonance failure of pipe system, a multi-order anti-resonance system reliability model is established in this paper. To analyze the effect of input variable uncertainty on the probability of system resonance failure, the variance-based importance measurement index is further established. By introducing the active learning Kriging (ALK) model, the resonance failure probability and importance measurement index can be calculated efficiently. The effects of fluid flow velocity, pressure and temperature on the probability of pipe resonance failure are analyzed in detail, which has significant guidance for the anti-resonance optimization design of pipes.

Dynamics and Stability of Magnetically Actuated Pipes Conveying Fluid

2016 ◽  
Vol 16 (06) ◽  
pp. 1550026 ◽  
Author(s):  
H. L. Dai ◽  
L. Wang
Keyword(s):  
Magnetic Force ◽  
Lateral Displacement ◽  
Flow Speed ◽  
Static Deflection ◽  
The Finite Element Method ◽  
Static Displacement ◽  
Pipe System ◽  
Magnetically Actuated ◽  
Pipes Conveying Fluid ◽  
Conveying Fluid

This paper is concerned with the development of a theoretical model for predicting the dynamics and pull-in instability of magnetically actuated pipes conveying fluid. The equation of motion of the pipe is constructed in the presence of nonlinear magnetic forces. The lateral displacement of the pipe comprises two parts, namely, a static displacement and a perturbation displacement about the static. Based on the finite element method (FEM), the static deflection of the pipe is calculated numerically first. The computed static deflection is then used to solve the equation governing the perturbed displacement. Consequently, the pull-in and flow-induced instabilities can be determined for clamped–clamped or cantilevered boundary conditions. Results show that the flow speed can significantly affects the static deflection of the pipe and hence the pull-in magnetic force. The magnetic force, on the other hand, has a great impact on the dynamics of the pipe system.

scholarly journals STABILITY OF ELASTICALLY RESTRAINED VALVE-PIPE SYSTEM WITH CRACK

2012 ◽  
Vol 06 ◽  
pp. 373-378 ◽  
Author(s):  
KWAN DO HUR ◽  
IN SOO SON ◽  
SEONG CHUL LEE
Keyword(s):  
Dynamic Stability ◽  
Critical Flow ◽  
Pipe Conveying Fluid ◽  
Attached Mass ◽  
Critical Flow Velocity ◽  
Pipe System ◽  
Local Flexibility ◽  
Stability Maps ◽  
Elastically Restrained ◽  
Conveying Fluid

The dynamic stability and natural frequency of elastically restrained pipe conveying fluid with the attached mass and crack are investigated in this paper. The pipe system with a crack is modeled by using extended Hamilton's principle with consideration of bending energy. The crack on the pipe system is represented by a local flexibility matrix and two undamaged beam segments are connected. The crack is assumed to be in the first mode of fracture and to be always opened during the vibrations. From the governing equations, the influence of attached mass, its position and crack on the dynamic stability of elastically restrained pipe system is presented. Also, the critical flow velocity for the flutter and divergence due to the variation in the position and stiffness of supported spring is studied. Finally, the critical flow velocities and stability maps of the cracked pipe conveying fluid with the attached mass are obtained by the changing parameters.

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