Optimization of submerged floating tunnel cross section based on parametric Bézier curves and hybrid backpropagation - genetic algorithm

Zou, P.X.; Bricker, Jeremy D.; Uijttewaal, W.S.J.

doi:10.1016/j.marstruc.2020.102807

Cited by 30 publications

(8 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The in-line force on the SFT tube is mainly determined by cross-sectional geometry and hydrodynamic loading. A parametric Bézier curve defined the SFT cross-sectional geometry in our previous research, showing better hydrodynamic performance than the simpler shapes under uniform current, tsunami, and typhoon conditions (P. Zou et al, 2020;Zou et al, 2020aZou et al, , 2020b. However, hydrodynamic performance analysis of the SFT under tidal flow conditions, and detailed understanding of the physics of flows around the SFT Figure 1 Schematic configuration of an SFT system.…”

Section: Introductionmentioning

confidence: 89%

Submerged floating tunnel cross-section analysis using a transition turbulence model

Zou

Bricker

Uijttewaal

2021

Journal of Hydraulic Research

Self Cite

View full text Add to dashboard Cite

Concepts of a submerged floating tunnel (SFT) for novel sea-crossings have been researched in recent years. An SFT tube should be moored afloat by tensioned mooring systems to maintain the tube position under complex hydrodynamic loads. In-line force is amongst the dominant hydrodynamic parameters in the SFT cross-section design and the mooring system reliability evaluation. Selecting a suitable in-line force computation method is crucial to successful and accurate SFT cross-section optimization. The transition SST model is an effective turbulence transition prediction tool in the boundary layer computation subjected to tidal flow at both low and high Reynolds numbers. Two types of parametric Bézier curves applied in airfoil optimization are used to describe the SFT cross-section. We show that an SFT cross-section described by a leading-edge Bézier-PARSEC (BP) curve has better hydrodynamic performance than a trailing-edge BP curve of equal aspect ratio (AR). To avoid large flow separation, an AR not exceeding 0.47 is recommended. An SFT cross-section design should balance hydrodynamic performance and construction cost. The SFT cross-section with AR = 0.47 using the leading-edge BP curve with fixed clearance has a comparatively small in-line force and a minimum material cost.

show abstract

Section: Introductionmentioning

confidence: 89%

Submerged floating tunnel cross-section analysis using a transition turbulence model

Zou

Bricker

Uijttewaal

2021

Journal of Hydraulic Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…Перехід від неперервних функцій до дискретних дозволяє оптимізувати з'єднання з покроковою зміною товщини [12]. Якщо ж шукана функція є неперервною, то то її можна описати за відомими значеннями в системі точок за допомогою сплайнів [13], функцій Безьє [14,15] або рядів Фур'є [16; 17]. Оскільки кількість параметрів досить велика, а розв'язання оберненої задачі оптимізації навіть числовими методами є неможливим, то для розв'язання задачі оптимізації використовуються наближені методи, наприклад, генетичні алгоритми.…”

Section: вступunclassified

Application of Bezier curves for description of structure shape in optimization of adhesive joints

Kurennov,

Barakhov,

Barakhova

2023

SRIT

View full text Add to dashboard Cite

The problem of topological optimization of a symmetrical double-shear adhesive joint has been solved. The suggested mathematical model of a joint with variable thickness generalizes the classic Holland–Reissner model. The shape of the doubler is described by means of the Bezier curve. Seeking parameters in the optimization problem are coordinates of reference points of the Bezier curve. Both joint length and doubler cross-section area can be considered an objective function. The restriction is applied on stress in adhesive film and doubler. The direct problem of finding the joint stress state at given geometric parameters was solved using the finite difference method. The genetic algorithm was used to solve the optimization problem. In order to improve the convergence of the genetic algorithm, the island model of evolution is suggested, which ensures quick evolution selection and stability of obtained results. The model problem is solved.

show abstract

“…However, other cross-sectional types have their own advantages and disadvantages [3]. Based on fluid dynamics optimization, a method using parameter Bezier curves to describe the pipe section has been proposed [4]. Inspired by tension leg platforms, the anchoring system of underwater floating tunnels can refer to tension legs.…”

Section: Introductionmentioning

confidence: 99%

“…The arrangement of the anchoring system depends on the environmental conditions. A vertical arrangement is suitable for areas with minimal lateral forces, while mixed and inclined arrangements are considered for complex underwater environments [4,6]. Similar to the construction process of immersed tunnels, SFT are divided into different pipe segments connected by pipe joints.…”

Section: Introductionmentioning

confidence: 99%

Effect of Stratified Flow on the Vibration of Anchor Cables in a Submerged Floating Tunnel

Xiong,

Sang,

Shi

et al. 2024

JMSE

View full text Add to dashboard Cite

This study investigates the vertical-type submerged floating tunnel with anchor cables. Based on the characteristics of the anchor cables, the anchor cables are simplified as a nonlinear beam model with hinged ends. Disregarding the axial displacement of the tunnel body, the loads will cause displacements in the x and z directions of the tunnel body. The vibrations of the anchor cables are decomposed into three directions, and the parameter excitation at the connection point between the anchor cables and the tunnel body is taken into account. The equations of motion for the three degrees of freedom of the anchor cables are established using Hamilton’s principle, and then the three equations are solved using the Galerkin method and the fourth-order Runge–Kutta method. The basic characteristics of an internal wave stratified flow acting on the anchor cables are considered, as well as the influence of the incident angle of the ocean currents on the three degrees of freedom of the anchor cables. The results indicate that (1) stratified flow weakens the first- and third-order vortex-induced vibrations of the anchor cables while enhancing the second-order vortex-induced vibrations. When considering the parameter excitation of the anchor cables, the first- and third-order vibrations are weakened, while the second-order vibration remains significant; (2) the first-order vibration of the anchor cables reaches its maximum value when the transverse oscillation frequency of the tunnel body is twice its natural frequency, and the second-order vibration of the anchor cables reaches its maximum value when the transverse oscillation frequency of the tunnel body is twice its natural frequency; (3) the downstream vibration of the anchor cables increases with the increase in the incident angle of the ocean currents, the cross-flow vibration of the anchor cables decreases with the increase in the incident angle of the ocean currents, and the axial vibration of the anchor cables reaches its maximum value when the incident angle of the ocean currents is 60 degrees; (4) stratified flow weakens the lock-in phenomenon of the anchor cables, and the influence of the 1/2 stratified flow on the vibrations of the anchor cables is greater than the influence of the 1/2 stratified flow.

show abstract

Optimization of submerged floating tunnel cross section based on parametric Bézier curves and hybrid backpropagation - genetic algorithm

Cited by 30 publications

References 30 publications

Submerged floating tunnel cross-section analysis using a transition turbulence model

Submerged floating tunnel cross-section analysis using a transition turbulence model

Application of Bezier curves for description of structure shape in optimization of adhesive joints

Effect of Stratified Flow on the Vibration of Anchor Cables in a Submerged Floating Tunnel

Contact Info

Product

Resources

About