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Journal articles on the topic 'Flexible pipe vibration study'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Yang, Yang, Guang Pan, Shaoping Yin, and Ying Yuan. "Experiment Investigate on the Effectiveness of Flexible Pipes to Isolate Sea-Water Pump Generated Vibration." Coatings 10, no. 1 (January 3, 2020): 43. http://dx.doi.org/10.3390/coatings10010043.

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Vibration control is important in maintaining the silence of the underwater vehicle. Among the many methods of vibration control, isolation is by far the most efficient approach. However, as one of the major vibration sources in underwater vehicle, the vibration isolation of the sea-water pump has not been well explored. The sea-water pipe is the primary vibration transmit path from the sea-water pump to the housing. In order to realize the vibration isolation of the sea-water pump, the sea-water pipe must have certain flexibility and damping. In this study, scaled model tests were carried out to investigate the isolation effectiveness of flexible pipes in isolated sea-water pump. Specifically, three types of flexible pipes, i.e., double layer metal bellows (DLMB), rubber pipes (RP) and bellows coated rubber (BCR) were designed and tested. Tests were carried out under the operation rotate speeds of the sea-water pump. Our results show that compared with single layer metal bellows (SLMB), the isolation effectiveness of DLMB and BCR were significant and stable in high frequency regions. The optimal pipe can be chosen for different vibration reduction requirements in practical engineering.

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2

Fattah, Mohammed Yousif, Waqed Hammed Hassan, and Sajjad Emad Rasheed. "Behavior of Flexible Buried Pipes Under Geocell Reinforced Subbase Subjected to Repeated Loading." International Journal of Geotechnical Earthquake Engineering 9, no. 1 (January 2018): 22–41. http://dx.doi.org/10.4018/ijgee.2018010102.

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The present article constitutes an experimental investigation of the behavior of buried PVC pipes. A number of laboratory experiments were conducted using PVC pipes which were buried in a medium sand layer, below a subbase layer, reinforced with geocells. They were subject to repeated dynamic load amplitudes of 0.5 and 1 ton and loading frequencies of 0.5, 1 and 2 Hz, to study the effects of the geocell reinforcement layer, in terms of the amount of stress reaching the pipe crown and the vibration of the pipe. A 3D numerical model was also developed to investigate the performance of the geocell above the buried pipe. The predicted characteristics of the buried pipes were validated using the experimental data. The results showed that geocell reinforcement decreases both crown vibration by 35%, and the vertical pressure reaching the pipe by 41%. The numerical models have a good fit with the experimental work results, both confirming that geocell reinforcement has a significant role to play regarding increasing the safety of pipes.

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3

Wang, Zhicheng, Michael S. Triantafyllou, Yiannis Constantinides, and George Em Karniadakis. "An entropy-viscosity large eddy simulation study of turbulent flow in a flexible pipe." Journal of Fluid Mechanics 859 (November 23, 2018): 691–730. http://dx.doi.org/10.1017/jfm.2018.808.

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We present a new approach – the entropy-viscosity method (EVM) – for numerical modelling of high Reynolds number flows and investigate its potential by simulating fully developed incompressible turbulent flow, first in a stationary pipe and subsequently in a flexible pipe. This method, which was first proposed by Guermondet al.(J. Comput. Phys., vol. 230 (11), 2011, pp. 4248–4267), introduces the concept of entropy viscosity, computed based on the nonlinear localized residual obtained from the energy equation. Specifically, this nonlinear viscosity based on the local size of entropy production is added to the spectral element discretization employed in our work for stabilization at insufficient resolution. Unlike its original formulation, which includes anad hoctuneable parameter$\unicode[STIX]{x1D6FC}$, here, we determine the value of$\unicode[STIX]{x1D6FC}$by assuming that the entropy viscosity is analogous to the eddy viscosity of the Smagorinsky model. However, the overall approach has the flavour of the implicit large eddy simulation (ILES) instead of the standard large eddy simulation (LES). Given the empiricism of our approach, we have performed systematic studies of homogeneous isotropic turbulence for validation (see appendix A). We have also carried out a more complete numerical simulation study to investigate incompressible turbulent flow in a stationary pipe at$Re_{D}=5300$and$Re_{D}=44\,000$, following the work of Wu & Moin (J. Fluid Mech., vol. 608, 2008, pp. 81–112) who performed very accurate direct numerical simulations (DNS) of these two cases. We found that the mean flow, turbulence fluctuations, and two-point correlations of the EVM-based LES are in good agreement with the DNS of Wu & Moin despite the fact that we employed grids with resolution two orders of magnitude smaller. If we instead use the standard Smagorinsky model in our simulations, the computations become unstable due to insufficient resolution of the smaller scales. Another important difference is that the entropy-viscosity model scales with the cube of the distance from the wall and approaches zero at the wall, which is theoretically correct, as shown by oura posterioritests. Based on the validated EVM approach, we then simulated fully developed turbulent flow at$Re_{D}=5300$in a flexible pipe subject to prescribed vibrations in the cross-flow plane corresponding to a standing wave of amplitude$A$and wavelength$\unicode[STIX]{x1D706}=3D$, where$D=2R$is the pipe diameter and$R$is the radius. We have simulated 11 cases corresponding to increasing values of wave steepness$s_{o}=2A/\unicode[STIX]{x1D706}$, with$s_{o}\in [0,0.067]$. We found a quadratic dependence of the friction factor on$s_{o}$with the minimum at approximately$s_{o}\approx 0.01$, so, surprisingly, we have a slight decrease in drag at first and then a substantial increase compared to the stationary pipe. To obtain the turbulence statistics, we averaged the simulated flow over twenty time periods at the nodes and anti-nodes separately. We found substantial changes in the mean velocity profile at distances$(1-r)^{+}>5$while the peaks of turbulent intensities were amplified by 50 % in the axial direction and by 200 % in the normal and azimuthal directions at$s_{o}=0.067$. The peak shear stress at the node increased by more than 200 % whereas at the anti-node it attained negative values. Turbulent budgets revealed large changes close to the wall at$(1-r)^{+}<50$while flow visualizations showed that many more strong worm-like vortices were generated in the near-wall regions compared to the stationary pipe. We have also computed various spatio-temporal correlations that show that the pressure fluctuations are very sensitive to the pipe vibration and scale quadratically with$s_{o}$. Both pressure and velocity correlations exhibit cellular patterns consistent with the standing-wave pipe motion.

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4

Wang, Jialu, Fabo Chen, Chen Shi, and Jiuzheng Yu. "Mitigation of Vortex-Induced Vibration of Cylinders Using Cactus-Shaped Cross Sections in Subcritical Flow." Journal of Marine Science and Engineering 9, no. 3 (March 7, 2021): 292. http://dx.doi.org/10.3390/jmse9030292.

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Flexible cylinders, such as marine risers, often experience sustained vortex-induced vibrations (VIVs). Installing helical strakes on a riser is the most widely used technique to mitigate VIVs. This study was inspired by the giant Saguaro Cacti which can withstand strong wind with a shallow root system. In this study, numerical simulations of flow past a stationary cylinder of a cactus-shaped cross-section in a two-dimensional flow field at a subcritical Reynolds number of 3900 were performed. Results show that cylinders of a cactus-shaped cross-section have a lower lift coefficient without increasing drag compared to those of a circular cylinder. VIV experiments on a single flexible pipe as well as on a set of two tandem-arranged flexible pipes were conducted at different reduced velocities to investigate the effects of the streamwise spacing and wake of the cactus-like body shape on VIV mitigation. Experimental results show that the cactus-like body shape can mitigate VIV responses of the cylinder at upstream position with no cost of increased drag; however, similar to helical strakes, the efficiency of VIV mitigation for the cylinder at downstream position is reduced. Although the cactus-like body shapes tested in this study were not optimized for oscillation suppression, still this study suggests that modification of the cross-sectional shape to a well-designed cactus-like shape has potentials to be used as an alternative technology to mitigate VIV of marine risers.

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5

Carpenter, Chris. "Study Recognizes and Assists in Mitigation of Bottomhole Assembly Lateral Vibration Chatter." Journal of Petroleum Technology 72, no. 12 (December 1, 2020): 55–56. http://dx.doi.org/10.2118/1220-0055-jpt.

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This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 197231, “Recognition and Mitigation of the Bottomhole Assembly Lateral Vibration Chatter Mode,” by Jeffrey R. Bailey, SPE, and Harshit Lathi, ExxonMobil, and Matthew T. Prim, SPE, ADNOC, et al., prepared for the 2019 Abu Dhabi International Petroleum Exhibition and Conference, Abu Dhabi, 11-14 November. The paper has not been peer reviewed. Lateral vibration modeling of certain bottomhole assembly (BHA) designs has shown great sensitivity to the proximity of stabilizer blades. This paper explores the nature of the vibrational dysfunction known as BHA chatter. A field-proven frequency-domain model illustrates the cause of the dysfunction, its rotary-speed dependence, and mitigation methods and results. The complete paper provides three case studies exploring this phenomenon, one of which is included in this synopsis. Introduction The authors first describe the similarities and differences of a BHA and a stringed instrument. The string of a violin, for example, typically has two fixed nodal points: the first at the bridge, which does not change, and the second at the position of the musician’s finger, which is moved along the fingerboard in order to play notes of different frequencies. The finger pressing on the string causes it to have zero displacement at that location, which defines a nodal point. Additional nodal points may occur in the motion of the string as harmonics of the fundamental mode, but these are not considered to be fixed nodes because the amplitudes of the harmonics vary. The string is relatively flexible, so it can be described adequately with a second-order differential equation. Significantly, a BHA typically has more than two nodes. A lateral wave propagating along the BHA must satisfy the nodal point constraint of zero lateral deflection at all these locations. These nodes typically are placed without regard to the frequency of the wave traveling along the string, which is governed by the rotary speed and the type of lateral excitation. The geometric compatibility requirement that the pipe has zero displacement at the fixed nodes has ramifications. The nodal point constraints force the pipe to adapt to the locations of these nodes through contact forces that literally push the pipe back into position to honor the constraints. In some scenarios, this process requires large forces. One consequence of large forces pushing the pipe to maintain geometric compatibility is that these forces are applied to the outer diameter of a body that is rotating, so this response may also generate torque and associated wear of the contacting surfaces. This observation applies to both static and dynamic forces but most commonly is recognized in the static domain. It is not typically recognized in dynamics as applied to BHA design.

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6

Kordubaylo, Aleksey, Boris Simonov, and Yuri Pronkin. "WORKING PARAMETERS OF LOAD-BEARING ELEMENT OF HOLE VIBRATION SOURCE." Interexpo GEO-Siberia 2, no. 4 (2019): 98–106. http://dx.doi.org/10.33764/2618-981x-2019-2-4-98-106.

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Requirement of oil and gas industry in increasing of rate of hydrocarbon extraction from deposits contributes to development of science-based methods of oil production increasing. Vibrowave impact to productive seam is related to such methods. This impact can be effectively carried out with hole seismic signal sources. In the work results of study of load-bearing element of hole electro-magnetic pulse source are represented. Objective of the work is the study of static and dynamic strains of casing pipe, determination of values of pressure pulses at modified load-bearing element during its work with electro-magnetic striking center. Values of static and dynamic strains of casing pipe under the action of thrust force are experimentally determined. The values are located in flexible zone and make 1mm at the static load and from 0.35 up to 0.6mm at the pulse load. As the results of tests of vibration source prototype, dependence of pulse pressure value at load-bearing element on voltage of striking center supply under the pressure of preliminary pumping 20MPa is obtained. Pulse amplitude raises proportionally voltage in the range from 14.2 MPa up to 19.7 MPa. Experiments with increasing of pumping pressure in the range from 20 MPa up to 27 MPa have shown that ratio of pulse value to pumping pressure linearly reduces when voltage of striking center supply is constant. Obtained results are scientific basic for designing of load-bearing elements destined for work at pulse impact transfer mode.

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7

Xu, Bin, Jian-Fei Lu, and Jian-Hua Wang. "A Semi-Analytical Model for the Simulation of the Isolation of the Vibration Due to a Harmonic Load Using Pile Rows Embedded in a Saturated Half-Space." Open Civil Engineering Journal 4, no. 1 (March 30, 2010): 38–56. http://dx.doi.org/10.2174/1874149501004010038.

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The isolation of the vibration due to a harmonic vertical load using pile rows embedded in a saturated poroelastic half-space is investigated in this study. Using the fundamental solution for a circular patch load and Muki’s method, the second kind of Fredholm integral equations describing the dynamical interaction between the pile rows and the saturated poroelastic half-space are obtained. Numerical solution of the integral equations yields the dynamic response of the pile-half-space system. The vibration isolation effect of the pile rows is investigated via the proposed semi-analytical model. Numerical results indicate that stiffer piles have better isolation vibration effect than flexible piles. Moreover, the pile length and the spacing between neighboring piles in one pile row have significant influence on the isolation vibration effect of pile rows, while the influence of the spacing between neighboring pile rows is relatively smaller.

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8

Park, H. I., Y. P. Hong, M. Nakamura, and W. Koterayama. "Experimental Study on Vortex Induced Vibrations of Highly Flexible Immersed Pipe Subjected to Top End Oscillations." Journal of Waterway, Port, Coastal, and Ocean Engineering 130, no. 4 (July 2004): 207–14. http://dx.doi.org/10.1061/(asce)0733-950x(2004)130:4(207).

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9

Hosseinian, A., and A. H. Meghdadi Isfahani. "Experimental study of heat transfer enhancement due to the surface vibrations in a flexible double pipe heat exchanger." Heat and Mass Transfer 54, no. 4 (November 4, 2017): 1113–20. http://dx.doi.org/10.1007/s00231-017-2213-2.

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10

Ren, Qing, and Mao Song Huang. "Analysis for Axial Vibration and Internal Forces of Totally and Partially Embedded Pile Groups with Flexible Caps." Advanced Materials Research 163-167 (December 2010): 3860–67. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.3860.

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In this paper, a simplified analytical method is developed for the axial harmonic response of totally and partially embedded pile groups in homogeneous and layered soil deposits. Based on BDWF model, finite element sub-structure method is used to setup the dynamic model of cap-pile groups which can precisely simulate kinetic interaction and inertial interaction. A comprehensive parameter study focuses on the influence of caps’ elastic modulus and mass density on pile groups’ dynamic response, and then points out the limition of rigid cap in practical design. An approximate solution is finally presented for the internal forces distributed on pile heads due to pile-to-pile interaction. The solution of above approach was compared with that of traditional simplified model (rigid and massless cap solution) in simulating an in-site experiment and dynamics response of partially embedded pile groups for offshore wind farm.

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11

ZHU, HONGPING, CHULONG CHEN, AIZHU ZHU, and YONG YUAN. "ISOLATION PERFORMANCE STUDY OF THE HONG KONG–ZHUHAI–MACAO BRIDGE ENGINEERING." Journal of Earthquake and Tsunami 07, no. 03 (September 2013): 1350018. http://dx.doi.org/10.1142/s1793431113500188.

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This paper investigates the isolation performances of bid DB02 section of the Hong Kong–Zhuhai–Macao Bridge. The navigable cable-stayed bridge and the non-navigable steel-concrete continuous girder bridge in the high-pier and low-pier regions are taken as an illustration. The finite element models with aseismatic bearings and isolated bearings are established and the seismic time-history analysis under the earthquake levels of P2 and P3 are carried out. The nonlinear properties of LRB, HDR, and FPB isolated bearings and the pile-soil interaction are simulated using bilinear spring elements and layered Winkler soil springs model, respectively. The results show that the bridge structure with isolated bearings is more flexible by extending vibration period. The dissipated hysteric energy can effectively reduce the earthquake energy and the response of the structure. Subject to the earthquake level P3, most piers of the bridge are in elastic state. Subject to the earthquake level P2, the bridge is in perfect elastic state. The isolating effect of the isolated bearings to the continuous girder bridge is better than the cable-stayed bridge with tower and beam consolidation.

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12

YOSHIZAWA, Masatsugu, Eiichiro MORITANI, Eiji HASEGAWA, and Yasushi TSUJIOKA. "Lateral vibration of a flexible pipe conveying fluid." Transactions of the Japan Society of Mechanical Engineers Series C 52, no. 474 (1986): 710–17. http://dx.doi.org/10.1299/kikaic.52.710.

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13

Yufeng, Gong, Peng Weicai, Zhang Junjie, and Liu Zhizhong. "Research on the Impediment to Vibration Wave Propagation of Pipe from a vibration isolation mass." MATEC Web of Conferences 288 (2019): 01002. http://dx.doi.org/10.1051/matecconf/201928801002.

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In order to control the pipe vibration, the performance of flexible connection with vibration isolation mass in impeding vibration wave propagation is studied. Based on the principle of impedance mismatching and numerical analysis method, the influences of vibration isolation mass and rotational inertia on the vibration wave propagation in pipe were discussed. The results show that the isolation mass is good at reducing the vibration of wave transmission in intermediate and high frequency domain. Meanwhile, The larger rotational inertia of the isolation mass, the better the damping effect. A useful reference was provided for the application of flexible connection to the vibration isolation and noise reduction of ship pipe.

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14

BONKOBARA, Yasuhiro, Takahiro KONDOU, Shuji SHIRAKI, and Keiichi TANABE. "127 Countermeasures for Pipe Vibration by Two Flexible Joints." Proceedings of the Dynamics & Design Conference 2006 (2006): _127–1_—_127–6_. http://dx.doi.org/10.1299/jsmedmc.2006._127-1_.

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15

Jung, Dong-ho, Han-il Park, Wataru Koterayama, and Hyeon-ju Kim. "Vibration of highly flexible free hanging pipe in calm water." Ocean Engineering 32, no. 14-15 (October 2005): 1726–39. http://dx.doi.org/10.1016/j.oceaneng.2005.02.005.

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16

GORMAN, D. G., J. M. REESE, and Y. L. ZHANG. "VIBRATION OF A FLEXIBLE PIPE CONVEYING VISCOUS PULSATING FLUID FLOW." Journal of Sound and Vibration 230, no. 2 (February 2000): 379–92. http://dx.doi.org/10.1006/jsvi.1999.2607.

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17

YOSHIZAWA, Masatsugu, Eiji HASEGAWA, Hiroyoshi NAO, and Yasushi TSUJIOKA. "Lateral vibration of a flexible pipe conveying fluid with pulsating flow." Transactions of the Japan Society of Mechanical Engineers Series C 51, no. 471 (1985): 2828–36. http://dx.doi.org/10.1299/kikaic.51.2828.

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18

YOSHIZAWA, Masatsugu, Hiroyoshi NAO, Eiji HASEGAWA, and Yasushi TSUJIOKA. "Lateral Vibration of a Flexible Pipe Conveying Fluid with Pulsating Flow." Bulletin of JSME 29, no. 253 (1986): 2243–50. http://dx.doi.org/10.1299/jsme1958.29.2243.

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19

Han, Yan. "Study on the Submarine Pipeline with Flexible Spoilers." Key Engineering Materials 501 (January 2012): 431–35. http://dx.doi.org/10.4028/www.scientific.net/kem.501.431.

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Two new methods which use flexible spoilers to protect submarine pipelines are proposed. One is put flexible spoiler on the top of the pipe to make pipe self-buried. The other is put flexible spoiler under the pipe to stop the erosion under the pipe. Through physical experiments, the pressure distribution and scour hole around the submarine pipeline with flexible deflectors were studied. Experiment results point out that top flexible spoiler can increase the resistance of the pipe, increase the scour hole depth, accordingly make the pipeline be self-buried. The flexible spoiler under the pipe can reduce the pressure difference between both sides of the pipeline, diminish the scour hole depth obviously and even to stop scour.

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20

Gu, Fan, Gan Song, Qiao Jin, and Hui Xin Wang. "Study on Optimal Winding Angle of Submarine Oil Flexible Pipe." Advanced Materials Research 602-604 (December 2012): 2223–26. http://dx.doi.org/10.4028/www.scientific.net/amr.602-604.2223.

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According to the actual structure, using the finite element software ANSYS, numerical model of submarine oil flexible pipe was established. For the mechanical response of flexible pipe under the combined effect of internal pressure load and transverse load, the comparison on the result by numerical calculation and static loading test shows that the numerical model of flexible pipe is rational. Moreover, based on the numerical model of flexible pipe, this paper indicates that the maximum Mises stress occurs at the end of flexible pipe, which would lead to the bulge performance failure. Furthermore, the influence of winding angle on the mechanical properties of flexible pipe was analyzed, and the optimal winding angle 30° was suggested to adopt.

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21

Zhang, Li, Shi Ming Ji, Yi Xie, and Qiao Ling Yuan. "Study of Active Vibration Control for Flexible Beam’s Vibration." Advanced Materials Research 69-70 (May 2009): 685–89. http://dx.doi.org/10.4028/www.scientific.net/amr.69-70.685.

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The attenuation of structure vibration is very slow when flexible strucure is stirred external force. It seriously affected the life of flexible structure. Smart structures used piezoelectric ceramics as actuators are an effective manner to solve the problem. This paper uses Fiber Bragg Grating (FBG) as sensors and piezoelectric ceramics as actuators to study the active vibration control for the resonance of the smart beam. Two groups of piezoelectric ceramics will be used for vibration exciter and vibration abatement, respectively. The fiber smart beam is excited to a sharp vibration nearby the particular resonance frequency by controlling the frequency of the vibration excitation. The vibration signal is measured by the FBG sensors and the close loop feedback control is fulfilled by the vibration abatement group, and the vibration amplitude of the fiber smart beam is abated. The experiment results show that the resonance amplitude of the beam is obviously abated by adjusting the frequency, amplitude and phase of the vibration abatement circuit.

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22

Li, Yunfeng, Yundong Li, Huabin Wen, and Wenbo Ning. "Dynamical response of a rotating cantilever pipe conveying fluid based on the absolute nodal coordinate formulation." Journal of Mechanics 37 (2021): 359–72. http://dx.doi.org/10.1093/jom/ufab005.

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Abstract A dynamical model of a rotating cantilever pipe conveying fluid is derived based on the absolute nodal coordinate formulation. The free vibration and dynamical response of the system are investigated in this paper. Based on the absolute nodal coordinate method and the extended Lagrangian equation proposed by Irschik for the nonmaterial system, the motion equation of the rotating flexible cantilever pipe conveying fluid is built. The influence of the rotational angular velocity and flow velocity on the natural frequency of the system is analyzed. The critical nondimensional circular frequency of in-plane vibration and critical nondimensional flow velocity are investigated. The static deformation is shown under different flow velocities and angular velocities. The nonlinear transient analyses of a rotating flexible cantilever pipe are completed with the variation of parameters. During the rotation, the Coriolis force of fluid acting on the pipe has a great effect on the static deformation.

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23

AGATA, Jun, Kiyotaka YAMASHITA, and Masatsugu YOSHIZAWA. "444 Beating Phenomena of Nonplanar Vibration of a Flexible Pipe Conveying Fluid." Proceedings of the Dynamics & Design Conference 2003 (2003): _444–1_—_444–6_. http://dx.doi.org/10.1299/jsmedmc.2003._444-1_.

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24

Yau, C. H., A. K. Bajaj, and O. D. I. Nwokah. "Active Control of Chaotic Vibration in a Constrained Flexible Pipe Conveying Fluid." Journal of Fluids and Structures 9, no. 1 (January 1995): 99–122. http://dx.doi.org/10.1006/jfls.1995.1005.

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25

Wang, Jianwei, Shixuan Wang, Haoyu Le, and Maoxin Ge. "Rigid-flexible coupled multi-body dynamics analysis of horizontal directional drilling rig system." Journal of Computational Methods in Sciences and Engineering 20, no. 3 (September 30, 2020): 975–95. http://dx.doi.org/10.3233/jcm-194119.

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To reduce the failure probability of gas drainage drilling holes in coal mines, a new modeling method of gas drainage drilling machine is presented. Firstly, each drill pipe is regarded as a flexible body, and the Lagrange’s equation of second kind is used to model it. Secondly, the joint of drill bit, hole wall and drill pipe are regarded as rigid bodies, and the Newton-Euler method is used to model it. Thirdly, the rigid-flexible coupling multi-body dynamic model of drilling rig-drill pipe-hole wall system in medium and short horizontal section of soft coal seam is established by using relative node coordinate method, and the time complexity and operation complexity of modeling are reduced by using ADAMS macro program. Finally, the finite element method is used to discretize the model, and the virtual prototyping technology is used to solve the mathematical model. The simulation results show that the coupling of friction and vibration does not necessarily increase the probability of drilling failure, but sometimes reduces the amplitude of vibration. Compared with the length of each drill pipe, the influence of drilling depth on the system is greater, and the bit-bounce behaviours is more likely to occur in the deep hole. The operating frequency range of the drilling rig is 6.9E-3 to 2.1E+4Hz. When the length of the drill pipe is constant, the natural frequency of the system increases with the increase of the order, while the natural frequency of the deep hole section is almost unaffected by the order. In practical engineering, the vibration excitation of the actuator should be controlled to avoid the natural frequency. Meanwhile, the modal frequency should be avoided as far as possible to reduce the vibration and the failure probability of drilling holes. The model can simulate a series of dynamic responses of drilling rig system in drilling process, and provide theoretical support for subsequent multi-factor coupling modeling.

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26

Liu, Jun Kao, Wei Shan Chen, and Xiao Yu Lv. "Study on Ultrasonic Micromateriel Transmission System." Applied Mechanics and Materials 55-57 (May 2011): 2109–12. http://dx.doi.org/10.4028/www.scientific.net/amm.55-57.2109.

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A new type ultrasonic materiel transmission system is proposed in this study. In this new design, bending vibration traveling wave is generated in an elastic pipe by using two uniform sandwich type longitudinal vibration transducers. Thus, elliptical trajectory motions can be formed at particles on the pipe wall, which can drive the materiel by frictional force. The adopting of sandwich transducer in this device can gain large vibration amplitude and improve the electromechanical coupling efficiency. The structure and working principle of the proposed design are introduced. The transducer and the pipe are designed and analyzed by using FEM method. The longitudinal vibration mode of the transducer and the bending vibration mode of the pipe are analyzed, and the resonant frequencies of these two modes are tuned to be close. A prototype system is fabricated and measured.

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27

Gao, Xifeng, Zengwei Xu, Wanhai Xu, and Ming He. "Cross-Flow Vortex-Induced Vibration (VIV) Responses and Hydrodynamic Forces of a Long Flexible and Low Mass Ratio Pipe." Journal of Marine Science and Engineering 7, no. 6 (June 5, 2019): 179. http://dx.doi.org/10.3390/jmse7060179.

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Laboratory tests were carried out to investigate the cross-flow (CF) dynamic responses and hydrodynamic forces of a flexible pipe that subjected to vortex-induced vibration (VIV). The pipe had a critical mass ratio of 0.54 and an aspect ratio of 181.8. The uniform flow environment was realized by towing the pipe along a towing tank. The towing velocity ranged from 0.1–1.0 m/s with an interval of 0.05 m/s. Two axial pre-tension cases (200 N and 300 N) were enforced. The structural strains were measured at seven positions evenly distributed along the pipe. Then a modal analysis method was applied to reconstruct the displacement responses. It is revealed that the maximum CF displacement amplitude reached up to 2.18 pipe diameter and the strain response exhibited higher harmonic components. The CF dominant frequency gradually rises with the increase of reduced velocity and up to a three-order vibration mode can be observed. In addition, mean drag coefficient, lift force coefficient and added mass coefficient were also calculated to further investigate the fluid force feature of a low mass flexible pipe undergoing VIV.

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28

Xu, Lingyun, Laith K. Abbas, Dongyang Chen, and Xiaoting Rui. "Free Vibration Modeling and Computation of Reinforced Thermoplastic Pipe (RTP) Conveying Fluid in Off/Inshore Industry Applications." MATEC Web of Conferences 220 (2018): 01006. http://dx.doi.org/10.1051/matecconf/201822001006.

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Reinforced Thermoplastic Pipe (RTP) is a composite material flexible pipe. Due to RTP superior behavior, it encouraged the industry for using to offshore and inshore applications. Marine risers and cross-country pipelines resting on elastic medium are slender flexible structures conveying fluid and exhibit complex dynamic behaviors. Therefore, it requires accurate dynamic modeling for prediction the vibration characteristics. Transfer Matrix Method for Multibody Systems (MSTMM) is one of the sophisticated methods that can be used efficiently to model large systems and calculate its vibration characteristics and dynamic responses. The size of matrices in MSTMM remains small regardless of the number of elements in the model. Having smaller matrix sizes helps to have less computational expense leading to a faster answer. Based on the MSTMM advantages and Euler-Bernoulli linear theory, transfer matrix of the pipe in both offshore and inshore industry applications is built-up for vibration analysis. Recursive eigenvalue search algorithm is used to determine the system frequencies. Numerical examples are performed to validate with those published in the open literature.

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29

Omer, Fathelrhman, Pan Lingyong, and Li Baoren. "Study of Transient Transverse Vibration for a Pipe." Journal of Engineering and Applied Sciences 6, no. 2 (February 1, 2011): 114–21. http://dx.doi.org/10.3923/jeasci.2011.114.121.

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30

Khajehpour, S., and V. Azadi. "Vibration suppression of a rotating flexible cantilever pipe conveying fluid using piezoelectric layers." Latin American Journal of Solids and Structures 12, no. 6 (June 2015): 1042–60. http://dx.doi.org/10.1590/1679-78251535.

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31

Ren, Haojie, Yuwang Xu, Jingyun Cheng, Peimin Cao, Mengmeng Zhang, Shixiao Fu, and Ziyang Zhu. "Vortex-induced vibration of flexible pipe fitted with helical strakes in oscillatory flow." Ocean Engineering 189 (October 2019): 106274. http://dx.doi.org/10.1016/j.oceaneng.2019.106274.

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32

Yang, Wenwu, Xueping Chang, and Ruyi Gou. "Nonlinear vortex-induced vibration dynamics of a flexible pipe conveying two-phase flow." Advances in Mechanical Engineering 11, no. 10 (October 2019): 168781401988192. http://dx.doi.org/10.1177/1687814019881924.

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In this article, a vortex-induced vibration prediction model of a flexible riser conveying two-phase flow, including geometric and hydrodynamic nonlinearity, is established. A van der Pol wake oscillator is utilized to characterize the fluctuating lift forces. The finite element method is chosen to solve the coupled nonlinear fluid–structure interaction equations. The natural frequencies of the flexible riser are calculated to validate the method through comparisons with results from the literature. The modal analyses show that geometric nonlinearity has a significant effect on the natural frequency, and the critical internal velocity is reduced than those in linear analyses. The impacts of the gas volume fraction as functions of cross-flow velocity on the synchronization region, the displacement amplitudes, and the maximum stresses and frequency spectra have been investigated. The results show that an increase in the gas fraction results in the linear increase in natural frequencies and a wider synchronization region, and an increase in liquid flow rate led to the slight decrease in displacement amplitude and maximum stress within a small flow range.

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33

Ma, Cai Wei, and Xin Hua Zhao. "A Study for Removal of Pipe Vibration on Swirlmeter." Applied Mechanics and Materials 475-476 (December 2013): 324–29. http://dx.doi.org/10.4028/www.scientific.net/amm.475-476.324.

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This paper provides a method to eliminate pipe vibration on swirlmeter. We made an experimental research on a diameter 50 mm swirlmeter to study the influence that pipe vibration on the swirlmeter. Results show that using difference method can eliminate the error caused by pipe vibration by putting two sensors along the same side of the swirlmeters axis and using difference method. The experiment proved the approach using difference method to calculate the measured data feasible.

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Gu, Fan, Hui Xin Wang, and Li Sun. "Numerical Study on Mechanical Response of Steel Wire Wound Reinforced Rubber Flexible Pipe under Internal Pressure." Advanced Materials Research 594-597 (November 2012): 2668–71. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.2668.

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According to the actual structure of steel wire wound reinforced rubber flexible pipe, using the finite element software ANSYS, 3-D finite element model of flexible pipe is established. For the mechanical response of flexible pipe under internal pressure, the comparison on the result by numerical calculation, the static loading test and the result by analytic method shows that the 3-D finite element model of flexible pipe is rational. Moreover, based on the finite element model of flexible pipe, the influence of internal pressure, spanning length and reinforced steel wire diameter on the axial stress of the innerest steel layer and the Mises stress of the innerest rubber layer is analyzed.

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Gu, Fan, Dan Wang, Hui Xin Wang, and Jia Quan Sun. "Study on the Influence of Transverse Load on the Mechanical Response of Submarine Flexible Pipe." Applied Mechanics and Materials 256-259 (December 2012): 1042–45. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.1042.

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Taking 1 year return period wave data statistics of Cheng Dao sea area as an example, the wave-current flow hydrodynamic load acting on submarine flexible pipe was analyzed. According to the actual structure of submarine flexible pipe, ANSYS numerical model was established. Under the combined effect of internal operating pressure and transverse wave-current flow hydrodynamic load, the results calculated by numerical model shows that with the increase of transverse load, the bending deformation of flexible pipe increases linearly, and the stress of flexible pipe is almost constant.

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36

ONO, Manabu, and Shigeo KATO. "J11 A Basic Study of In-Pipe Mobile Microrobot Movable in Flexible Pipe." Proceedings of Conference of Kyushu Branch 2006.59 (2006): 255–56. http://dx.doi.org/10.1299/jsmekyushu.2006.59.255.

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37

Wu, Yan, Yu Li, Xinjun Gu, Ziyan Wen, Zhian Deng, and Kai Yi. "Experimental Study on Wettability of Xinjiang Oilfield Crude Oil on Two Kinds of Non-Metallic Pipes." ITM Web of Conferences 26 (2019): 03009. http://dx.doi.org/10.1051/itmconf/20192603009.

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In recent years, non-metallic pipes have been widely used in oilfield development due to their excellent corrosion resistance. In this paper, the wettability of flexible composite pipe and plastic alloy pipe surface was studied for some crude oil in Xinjiang oilfield. The wettability of the surface of the flexible composite pipe and the surface of the plastic alloy pipe and its influence on the flow resistance were discussed, and the wettability of the crude oil on the metal surface was compared. This experimental study has certain guiding significance for the judgment of pressure drop of crude oil conveyed by flexible composite pipe and plastic alloy pipe.

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Chen, Zheng-Shou, and Shin Hyung Rhee. "Effect of traveling wave on the vortex-induced vibration of a long flexible pipe." Applied Ocean Research 84 (March 2019): 122–32. http://dx.doi.org/10.1016/j.apor.2018.12.011.

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Liu, Yong, Hai Bo Meng, and Wei Jian Lv. "Experimental Research on Vibration Transmission and Isolation for Ship’s Seawater Piping System." Applied Mechanics and Materials 192 (July 2012): 68–72. http://dx.doi.org/10.4028/www.scientific.net/amm.192.68.

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Noise caused by vibration in ship’s seawater piping system can easily transfer outboard. This will destroy the stealth of some military ships for especial purpose. In this paper, experiments were carried out to investigate the pipe vibration under the prompting of seawater pump in a testing platform. The vibration transmission character along pipeline is researched and the isolation effects of shock absorption bracket and flexible rubber bellows were analyzed. Based on the results, some advices were given for the vibration resisting of the seawater piping system.

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Shi, Jiangwei, Yu Wang, and Charles W. W. Ng. "Numerical parametric study of tunneling-induced joint rotation angle in jointed pipelines." Canadian Geotechnical Journal 53, no. 12 (December 2016): 2058–71. http://dx.doi.org/10.1139/cgj-2015-0496.

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Pipeline–tunnel interaction has attracted increasing research attention recently. Previous studies focused mainly on tunneling-induced deformation in continuous pipelines. In this paper, an extensive numerical parametric study is conducted to investigate the response of jointed pipelines (where joints are simulated as hinges) to tunnel excavation. Prior to the numerical parametric study, the numerical model was verified by centrifuge test results. Parameters considered include ground settlement profile, pipe dimensions, pipe segment length, and soil properties. The maximum and minimum joint rotation angles occur when the tunnel centerline is located directly beneath a joint and a pipe segment center, respectively. When pipe segments are relatively flexible, the joint rotation angle increases rapidly as pipe segment flexural stiffness increases. In contrast, negligible changes are observed in the joint rotation angle for relatively stiff pipe segments when pipe segment flexural stiffness changes. A dimensionless parameter, called relative pipe segment–soil stiffness, is defined to differentiate the response of flexible and stiff jointed pipelines. The relative pipe–soil stiffness and normalized pipe segment length are adopted to predict jointed rotation angles for relatively flexible and stiff pipelines, respectively. Dimensionless plots are developed for directly estimating upper and lower bounds on joint rotation angles due to tunneling.

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Shang, Ying, Xiao Hui Liu, Chang Wang, Gan Li, Guo Yu Zhang, Wen An Zhao, Jing Sheng Lv, and Ying Ying Wang. "Study of Optical Fiber Fluid Flow Monitoring System Using Pipe Vibration Frequency Characteristic." Applied Mechanics and Materials 295-298 (February 2013): 2054–57. http://dx.doi.org/10.4028/www.scientific.net/amm.295-298.2054.

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In the oil field development and production, fluid flow is an extremely important parameter which determines the transmission characteristics of the oil production, real-time monitoring of fluid flow parameter provides a scientific basis for oil and gas optimization exploration and increase of reservoir recovery. A method for interrogating fiber optic sensors using flow-induced pipe vibration is proposed, then the fixed relationship between standard deviation of pipe wall’s vibration induced by fully developed turbulence and mean flow rate is determined, by the abundant experimental data analysis,The vibration frequency characteristic of the pipe’s vibration signals is found in the experimental system.and fluid flow is measured non-intrusively, the study is conducted on vibration induced by turbulent flow when fluid flow through pipe.

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42

Gu, Fan, Jing Hai Zhou, Hong Hai, and Yan Sheng Song. "Pullout Test Study on Flexible Joint of Ductile Iron Buried Pipelines." Advanced Materials Research 368-373 (October 2011): 1130–33. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.1130.

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Axial pullout test on ductile iron buried pipelines with MTS testing machine was carried out, the relation curve between axial tension and flexiable joint displacement was gotten, the functional failure mechanism of flexible joint of buried pipeline was discussed. The results indicate that there is relative displacement between pipe and soil under seismic action, meanwhile, the acting force between pipe and soil is the viscous damping force which is related to pipe-soil relative speed.

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43

YOSHIZAWA, Masatsugu, Kazuo UENO, Eiji HASEGAWA, and Yasushi TSUJIOKA. "Lateral vibration of a cantilevered flexible pipe conveying fluid. (A horizontal excitation at the upper end of the vertical pipe)." Transactions of the Japan Society of Mechanical Engineers Series C 54, no. 497 (1988): 100–107. http://dx.doi.org/10.1299/kikaic.54.100.

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44

YOSHIZAWA, Masatsugu, Daisuke KONDO, Eiji HASEGAWA, and Yasushi TSUJIOKA. "Lateral vibration of a cantilevered flexible pipe conveying fluid. A vertical excitation at the upper end of the vertical pipe." Transactions of the Japan Society of Mechanical Engineers Series C 54, no. 505 (1988): 2033–40. http://dx.doi.org/10.1299/kikaic.54.2033.

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45

Ghobarah, A., and W. K. Tso. "Behaviour of buried small flexible pipes." Canadian Journal of Civil Engineering 15, no. 3 (June 1, 1988): 486–89. http://dx.doi.org/10.1139/l88-065.

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An analytical and experimental investigation was conducted to study the behaviour of buried small diameter flexible plastic drain pipes when subjected to surface wheel loads. Tests were conducted on drain pipes buried under sand and also typical agriculture soil samples from Southern Ontario. In addition to soil types, the effect of soil compaction on the stresses and deformation of the pipe was evaluated.It was found that the modulus of soil reaction is highly dependent on the degree of compaction of the soil adjacent to the pipe. By using compacted sand around the pipe, the modulus of soil reaction can be increased significantly, thereby reducing the deformation of the pipe. Using the appropriate value of the modulus of soil reaction, it is shown that theoretical predictions of pipe deformation correlate well with test measurements. Key words: plastic, flexible, buried, pipe, experimental, deformation.

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46

Vakil, M., R. Fotouhi, P. N. Nikiforuk, and F. Heidari. "A study of the free vibration of flexible-link flexible-joint manipulators." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 225, no. 6 (May 25, 2011): 1361–71. http://dx.doi.org/10.1177/0954406211399517.

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In this article, explicit expressions for the frequency equation, mode shapes, and orthogonality of the mode shapes of a Single Flexible-link Flexible-joint manipulator (SFF) are presented. These explicit expressions are derived in terms of non-dimensional parameters which make them suitable for a sensitivity study; sensitivity study addresses the degree of dependence of the system’s characteristics to each of the parameters. The SFF carries a payload which has both mass and mass moment of inertia. Hence, the closed-form expressions incorporate the effect of payload mass and its mass moment of inertia, that is, the payload mass and its size. To check the accuracy of the derived analytical expressions, the results from these analytical expressions were compared with those obtained from the finite element method. These comparisons showed excellent agreement. By using the closed-form frequency equation presented in this article, a study on the changes in the natural frequencies due to the changes in the joint stiffness is performed. An upper limit for the joint stiffness of a SFF is established such that for the joint stiffness above this limit, the natural frequencies of a SFF are very close to those of its flexible-link rigid-joint counterpart. Therefore, the value of this limit can be used to distinguish a SFF from its flexible-link rigid-joint manipulator counterpart. The findings presented in this article enhance the accuracy and time-efficiency of the dynamic modeling of flexible-link flexible-joint manipulators. These findings also improve the performance of model-based controllers, as the more accurate the dynamic model, the better the performance of the model-based controllers.

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47

Yan, K., Pei Qi Ge, and Wen Bo Bi. "Study on Vibration Characteristic and Stress Intensity of Planar Elastic Tube Bundles." Materials Science Forum 628-629 (August 2009): 227–32. http://dx.doi.org/10.4028/www.scientific.net/msf.628-629.227.

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Heat transfer enhancement is achieved by flow-induced vibration in planar elastic tube bundle heat exchangers. The optimum of structural parameters of tube bundle is of importance to the characteristic and control of flow-induced vibration. The influence of pipe structural parameters such as cross section diameter, thickness and connectors mass on vibration characteristic is studied in this paper with numerical simulation method. Based on the amplitude of flow-induced vibration and stress intensity, the characteristic of planar vibration and vertical vibration are compared, and the amplitude range of infinite fatigue life is predicted. The results show that the cross section diameter of pipe and the connectors mass have major influence on the vibration characteristic of tube bundle. Compare to the planar vibration of tube bundle, the vertical vibration has much advantage in the vibration amplitude and stress intensity distribution.

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48

GAWĘDZKI, Wacław, and Jerzy TARNOWSKI. "A STUDY OF THE INFLUENCE OF FRICTION FORCES ON THE TRANSMISSION OF SOIL VIBRATION ON GAS PIPELINES." Tribologia 272, no. 2 (April 30, 2017): 49–58. http://dx.doi.org/10.5604/01.3001.0010.6272.

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The article presents the influence of friction force values during the contact of a gas pipeline with sand pack on the transmission of soil vibrations on a tested pipe section. Field experiments were carried out on standard gas pipeline insulations subjected to dynamic interactions. The load sources comprised artificially generated soil vibrations with an impulsive character. Within the course of experiments, soil and pipe vibration acceleration signals were registered for different values of friction forces in its contact with the soil. The value of friction forces being a variable parameter during experiments were applied by the change of values of the tension static force of the gas pipeline section. The analysis of the registered soil and pipe vibration acceleration signals were conducted based on the time-domain signal decomposition method, Hilbert-Huang Transform (HHT). This method enables one to decompose the non-stationary vibration acceleration signal into narrowband components. For each component, a course of instantaneous values for frequency and amplitude was specified. The dependence of the pipe vibration acceleration amplitude on the pipe tensile force and friction force of the pipe in the contact with the soil was demonstrated.

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49

Mu, Hui Jin. "Study on Variable Structure Vibration Control for Flexible Manipulator." Advanced Materials Research 875-877 (February 2014): 1961–66. http://dx.doi.org/10.4028/www.scientific.net/amr.875-877.1961.

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In recent years, modeling and control of flexible space robots are extensively researched. Compared with traditional rigid robots, flexible robots have low energy consumption, wide operating space, high carrying capacity and other characteristics. However, due to its special structure, the robot arm will get deformation and vibration in motion, which brings a lot of problems to the positioning and tracking control of flexible space robots. Therefore, directing at the dynamics modeling and control issues of the free-floating flexible dual-arm space robots, this article carries out in-depth study. This paper first studies the elastic deformation and vibration of the flexible space manipulator and the robust control problem of the system trajectory tracking for free-floating flexible dual-arm space robots.

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Yu, Shaoming, Tian Lu, Guo Wei, and Yanping Hu. "Research on Vibration Characteristics of Typical Pipe." MATEC Web of Conferences 198 (2018): 02001. http://dx.doi.org/10.1051/matecconf/201819802001.

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Through the study on the vibration characteristics of the typical pipe, it tries to provide the basis for the pipe design and the pipe ground test method. A typical pipe is selected. First, modal analysis is carried out through theoretical analysis and finite element simulation. Then, pipe vibration is studied by finite element simulation and test. The results show that the theoretical results in modal analysis coincide well with those in finite element simulation. The finite element simulation and experimental results are basically consistent in vibration analysis. The reason for the difference is mainly the ideal boundary of simulation. The combination of finite element simulation and test is an important method for the research of pipe reliability and environmental adaptability.

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