Using pipe-in-pipe systems for subsea pipeline vibration control

Bi, Kaiming; Hao, Hong

doi:10.1016/j.engstruct.2015.11.018

Cited by 100 publications

(19 citation statements)

References 37 publications

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“…Often damages may also be associated with pipeline vibrations. For example, vortex-induced vibrations (VIV) of subsea pipelines [6], vibrations caused by earthquake excitations in seismic active zones [7] or vibrations induced by strong winds [8]. These dynamic loadings may induce excessive stresses in the pipe structure and lead to damage.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation on the effectiveness of using viscoelastic materials to mitigate seismic induced vibrations of above-ground pipelines

Hao

2016

Engineering Structures

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a b s t r a c tPipeline systems are commonly used to transport oil, natural gas, water, sewage and other materials. They are normally regarded as important lifeline structures. Ensuring the safety of these pipeline systems is crucial to the economy and environment. There are many reasons that may result in the damages to pipelines and these damages are often associated with pipeline vibrations. Therefore it is important to control pipeline vibrations to reduce the possibility of catastrophic damages. This paper carries out numerical investigations on the effectiveness of using viscoelastic materials to mitigate the seismic induced vibrations of above-ground pipelines. The numerical analyses are carried out by using the commercial software package ANSYS. The numerical model of the viscoelastic material is firstly calibrated based on the experimental data obtained from vibration tests of a 1.6 m long tubular sandwich structure. The calibrated material model is then applied to the above-ground pipeline system. The effectiveness of using viscoelastic materials as the seismic vibration control solution is investigated. The influences of various parameters, including the constraining arrangement scenarios, the constraining length and angle, the thicknesses of the viscoelastic material and constraining layer are discussed in detail. The influence of earthquake frequency content is discussed as well. Numerical results show that with properly selected viscoelastic materials and constraining layers, the proposed method can be used to effectively mitigate seismic induced vibrations of above-ground pipelines.

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Section: Introductionmentioning

confidence: 99%

Numerical simulation on the effectiveness of using viscoelastic materials to mitigate seismic induced vibrations of above-ground pipelines

Hao

2016

Engineering Structures

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“…To reduce the vibration of the water pump, a spring shock absorber should be added on the side of the base of the steel frame. Soft connection is installed on both ends of the inlet and the outlet, and the concentricity should be adjusted [15,16]. Current practice shows that these methods are very effective in reducing noise transmission.…”

Section: Overall Noise Reduction Schemementioning

confidence: 99%

Research on Noise Reduction Scheme of Heat Pump Unit in a Square

Zhang

Geng³

et al. 2020

Journal of Chemistry

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Heat pump unit is a host device located in the central air-conditioning terminal, providing cold and hot water. Heat pump unit has the advantages of energy saving, environmental protection, easy maintenance, and so on. It is adopted to solve the problems of refrigeration and heating in ventilation and air conditioning from many engineering projects in China. When the equipment is turned on, however, the high noise generated by the heat pump unit has a very negative impact on the life and work of the surrounding residents. Therefore, noise reduction is needed to improve the environment quality. In this paper, the noise of the air-cooled heat pump unit of the square area in Shanghai was detected, the noise source was analyzed, and the corresponding noise reduction scheme was proposed. After the completion of the scheme, measurements indicate that A-weighted sound pressure level is less than or equal to 60 dB (A) during the day and less than or equal to 50 dB (A) at night, which meets the relevant national noise limit emission standards and conforms to the second-class quality standard of the acoustic environment.

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“…The effectiveness of using FHP for SSP heave motion mitigation has been verified through both numerical and experimental studies by many researchers . Instead of rigidly connecting the SSP and heave plate, tuned heave plate (THP) has also been developed recently to further improve the performance of the control system based on the concept of tuned mass damper (TMD), a method that is widely applied in reducing the seismic‐, wind‐, and wave‐induced vibrations of engineering structures . In this system, SSP and the heave plate are connected by carefully designed (i.e., tuned) springs and dampers.…”

Section: Introductionmentioning

confidence: 99%

A novel rotational inertia damper for heave motion suppression of semisubmersible platform in the shallow sea

Hao

2019

Struct Control Health Monit

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Semisubmersible platforms (SSPs) have been widely used in the offshore industries for energy exploitation. SSP is vulnerable to the heave motions, and continuous heave motions may cause fatigue damage to the structural and nonstructural members or even sinking of the platform. It is therefore imperative to suppress the undesired heave motions of SSP. In the present study, a novel hydraulic rotational inertia damper (RID), which can amplify the fluid resistance of the submerged plates, is proposed on the basis of the concept of inerter to mitigate the heave motions of SSP. Analytical studies are conducted in both the frequency and time domains to investigate the control effectiveness of the proposed method. For comparison, the responses of the SSP controlled by the commonly adopted fixed heave plate (FHP) and tuned heave plate (THP) are also calculated. Analytical results show that the proposed RID system is more effective in reducing the heave motions of SSP, and it can achieve the identical control performance of the FHP and THP systems by using a much smaller plate size, thus smaller physical mass (less than 0.8% of the mass of the heave plate in this research). Furthermore, it is found that the RID system performs better in the harsher wave conditions, and its effectiveness increases with the increase of wave height. The proposed method provides an attractive alternative to effectively and economically suppress the heave motions of SSP in the shallow sea.KEYWORDS fixed heave plate, heave motion suppression, inerter, rotational inertia damper, semisubmersible platform, tuned heave plate SSP is most widely applied due to its wider range of applicable water depth, larger deck area, and bigger payload capacity. However, the shallow draft and large pontoons of SSP may lead to the excessive heave motion to the platform. These continuous vibrations may not only result in the fatigue damage to the structural/nonstructural components but also affect the health of the crew and reduce the serviceability and efficiency of the platform. The aim of the present study is to propose a novel method to suppress the excessive heave motion of SSP in the shallow sea.Considerable research efforts have been made to suppress the adverse vibrations of offshore platforms, and various control methods have been proposed. These methods can be roughly classified as the passive, active, semiactive, and hybrid methods. 3 Compared with the other control systems, passive methods require no external energy input and are widely used in engineering practice. For SSP, the most commonly utilized passive method is to install a ballast or fixed heave plate (FHP) at the bottom of the platform to increase the added mass/damping of the system. The effectiveness of using FHP for SSP heave motion mitigation has been verified through both numerical and experimental studies by many researchers. 4,5 Instead of rigidly connecting the SSP and heave plate, tuned heave plate (THP) has also been developed recently to further improve the performance of the control ...

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Using pipe-in-pipe systems for subsea pipeline vibration control

Cited by 100 publications

References 37 publications

Numerical simulation on the effectiveness of using viscoelastic materials to mitigate seismic induced vibrations of above-ground pipelines

Numerical simulation on the effectiveness of using viscoelastic materials to mitigate seismic induced vibrations of above-ground pipelines

Research on Noise Reduction Scheme of Heat Pump Unit in a Square

A novel rotational inertia damper for heave motion suppression of semisubmersible platform in the shallow sea

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