CN104820761A - Method for designing anti-bending structure of octagonal safety pin pile leg - Google Patents

Abstract

The invention provides a method for designing an anti-bending structure of an octagonal safety pin pile leg. The method comprises the steps of defining pile leg model parameters, establishing a pile leg solid model, performing processing prior to analysis on the pile leg solid model, applying load and fixed constraint on the pile leg solid model, defining design variables, defining constraint, defining an objective function and performing optimized analysis to obtain the optimal solution of the dimension. According to the method, the deformation of the pile leg is minimum when ship body operation is performed or when a ship is inclined due to the fact that the pile leg are not in contact with the seabed simultaneously in the sinking process, and the ship body bearing reliability is high.

Description

A kind of octagon latch spud leg Anti-bending structure method for designing

Technical field

The present invention relates to the designing for manufacturing technical field of marine engineering equipment, particularly relate to a kind of octagon latch spud leg Anti-bending structure method for designing.

Background technology

The spud leg of modern marine windmill vessel is as support component during whole hull operation, and whether its physical dimension is rationally most important.Because the type octagon spud leg relies on the alternately mobile of pin to control moving up and down of spud leg, pin-and-hole wall is relied on again to support the quality of hull for a long time during hull operation, once a certain hole wall is by conquassation, other hole walls will bear larger pressure, aggravation is by conquassation probability, and this will cause huge irremediable loss.Secondly, when each spud leg is in hull operation, the motion due to crane causes the movement of hull center of gravity will produce side force to spud leg; Equally, spud leg, in sinking watching, is that when seabed is uneven or the defect of spud leg hydraulic system causes spud leg different, contact seabed causes the inclination of hull also all can produce to spud leg the flexural deformation that side force finally can cause spud leg.Little deflection can recover, but the deflection being above a certain value then can not recover, and when spud leg can be caused to be elevated, stuck even hull topples.In addition, the design of spud leg will take into account the current material of enterprise, such as, the steel plate of some thickness existing in enterprise warehouse will be used to reduce purchase cost as far as possible; Windmill vessel spud leg is as parts of hull in addition, to avoid changing size that is that spud leg has cured or that be not easy change as far as possible, the length on such as limit relatively with holes and the size in support aperture, also to take into account spud leg quality minimum etc. simultaneously, but also there is no publicly, systematically optimize the method for pile leg structure size at present.

Summary of the invention

In order to avoid the problem such as existing pile leg structure bending deformation quantity is excessive, the invention provides a kind of octagon latch spud leg Anti-bending structure method for designing.Comprise the following steps:

1) spud leg model parameter is defined; The xsect of described spud leg is octagon, and comprise the minor face be made up of the first steel plate and the long limit be made up of the second steel plate, described spud leg model parameter comprises: the first steel plate thickness w1; Second steel plate thickness w2; The steel plate thickness of all formation spud legs except the first steel plate and the second steel plate equals described first steel plate thickness; Distance b between two minor faces that octagon is relative; Second steel plate length a is the vertical distance between two minor faces that octagon is adjacent; First steel plate and corresponding thereto as inner octagon minor face steel plate between distance d; Be fixed on the distance c of centre two steel plate on the second steel plate; Pin-and-hole diameter D on spud leg; Spud leg length e; Spud leg side edge length f; The stressed F of single pin-and-hole on spud leg ₁; The side force F that spud leg bears ₂;

2) according to step 1) the middle spud leg model parameter defined, set up spud leg solid model;

3) for step 2) in set up spud leg solid model carry out analysis pre-treatment;

4) to step 2) the middle spud leg solid model applying side force F set up ₂, downward gravity F is applied to each pin-and-hole on spud leg ₁, fixed constraint is set to bottom spud leg simultaneously;

5) design variable is defined; Vertical distance a between adjacent two minor faces of definition octagon, the first steel plate and corresponding thereto as inside octagon minor face steel plate between distance d, centre two steel plate be fixed on the second steel plate distance c be design variable;

6) definition constraint; The computer capacity of design variable a is: 0 ~ (b-D)/2, define its material calculation; The computer capacity of design variable d is: 0 ~ a, defines its material calculation; The computer capacity of design variable c is: define its material calculation; The designing quality m of definition spud leg is less than maximal value M; The maximum stress σ that definition spud leg bears is less than the maximum stress σ of steel plate materials _max;

7) objective definition function; The deflection Δ x of spud leg is defined as objective function;

8) be optimized analysis and draw size optimum solution; For design variable composes initial design values, carry out the finite element analysis of octagon pile leg structure, obtain the initial value of deflection Δ x; In units of material calculation, carry out iteration optimization to design variable, { functional digraph of a, d, c} obtains design variable set of dimensions { a, d, c} corresponding when Δ x is minimum value according to functional digraph to design variable set of dimensions to obtain objective function Δ x.

Further, step 3) described in analyze pre-treatment and comprise: definition unit type, definition material attribute, definition unit size and definition unit shape.

Compared with prior art, the invention has the beneficial effects as follows: the spud leg adopting method of the present invention to obtain causes the deflection during inclination of hull minimum in contact seabed when hull operation or when spud leg is different in sinking watching, high to the supporting reliability of hull.

Accompanying drawing explanation

Fig. 1 is spud leg model schematic

Fig. 2 is spud leg outline schematic cross-section

Wherein, the 1-the first steel plate, the 2-the second steel plate

Embodiment

Below in conjunction with accompanying drawing 1,2 and embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.

Invention shows a kind of octagon latch spud leg Anti-bending structure method for designing, as Fig. 1, shown in 2, the present embodiment is for the optimal design of large-scale wind electricity installation ship spud leg, this spud leg is octagon AND DEWATERING FOR ORIFICE STRUCTURE, mainboard is NV690 ultra-high strength steel, thickness is while be 35mm, while be 100mm, spud leg effective length 60200mm, the nearly 650T of single weight, single pins hole maximum weighted reaches 3400T, this spud leg optimization method step is divided into spud leg relative dimensions parametrization, carry out parameterized solid modeling, carry out solid model and analyze pre-treatment, imposed load and constraint, definition design variable, definition constraint and objective function, be optimized analysis and draw multiple steps such as size optimum solution.Specific as follows:

1) spud leg model parameter is defined; The xsect of described spud leg is octagon, and comprise the minor face be made up of the first steel plate 1 and the long limit be made up of the second steel plate 2, described spud leg model parameter comprises: the first steel plate 1 thickness w1=35mm; Second steel plate 2 thickness w2=100mm; The steel plate thickness of all formation spud legs except the first steel plate 1 and the second steel plate 2 equals the thickness 100mm of described first steel plate 1; Distance b=5010mm between two minor faces that octagon is relative; Second steel plate 2 length a is the vertical distance between two minor faces that octagon is adjacent; First steel plate 1 and corresponding thereto as inner octagon minor face steel plate between distance d; Be fixed on the distance c of centre two steel plate on the second steel plate 2; Pin-and-hole diameter D=540mm on spud leg; Spud leg length e=60200mm; Spud leg side edge length f=185mm; The stressed F of single pin-and-hole on spud leg ₁=1.666 × 10 ⁵n; The side force F that spud leg bears ₂=2 × 10 ⁵n;

2) according to step 1) the middle spud leg model parameter defined, set up spud leg solid model;

3) for step 2) in set up spud leg solid model carry out analysis pre-treatment, comprise definition unit type, definition material attribute, definition unit size, definition unit shape;

4) to step 2) the middle spud leg solid model applying side force F set up ₂, downward gravity F is applied to each pin-and-hole on spud leg ₁, fixed constraint is set to bottom spud leg simultaneously;

5) design variable is defined; Vertical distance a between adjacent two minor faces of definition octagon, the first steel plate and corresponding thereto as inside octagon minor face steel plate between distance d, centre two steel plate be fixed on the second steel plate distance c be design variable;

6) definition constraint; According to pile leg structure geometric relationship, can obtain following restriction relation: b-2a>D, therefore, the computer capacity of design variable a is: 0 ~ 2235mm, defines its material calculation toler1=0.01; The computer capacity of design variable d is: 0 ~ a, defines its material calculation toler2=0.01; The computer capacity of design variable c is: define its material calculation toler3=0.01; Consider light-weight design, the designing quality m of definition spud leg is less than maximal value M; Consider that the resistance to compression of spud leg is burst ability, the maximum stress σ that definition spud leg bears is less than the maximum stress σ of steel plate materials _max;

7) objective definition function; The deflection Δ x of spud leg is defined as objective function;

8) be optimized analysis and draw size optimum solution; For design variable composes initial design values, carry out the finite element analysis of octagon pile leg structure, obtain the initial value of deflection Δ x; In units of material calculation, carry out iteration optimization to design variable, { functional digraph of a, d, c} obtains design variable set of dimensions { a, d, c} corresponding when Δ x is minimum value according to functional digraph to design variable set of dimensions to obtain objective function Δ x.

Above-mentioned explanation illustrate and describes the preferred embodiments of the present invention, as previously mentioned, be to be understood that the present invention is not limited to the form disclosed by this paper, should not regard the eliminating to other embodiments as, and can be used for other combinations various, amendment and environment, and can in invention contemplated scope described herein, changed by the technology of above-mentioned instruction or association area or knowledge.And the change that those skilled in the art carry out and change do not depart from the spirit and scope of the present invention, then all should in the protection domain of claims of the present invention.

Claims (2)

1. an octagon latch spud leg Anti-bending structure method for designing, is characterized in that, comprise the following steps:

1) spud leg model parameter is defined; The xsect of described spud leg is octagon, and comprise the minor face be made up of the first steel plate and the long limit be made up of the second steel plate, described spud leg model parameter comprises: the first steel plate thickness w1; Second steel plate thickness w2; The steel plate thickness of all formation spud legs except the first steel plate and the second steel plate equals described first steel plate thickness; Distance b between two minor faces that octagon is relative; Second steel plate length a is the vertical distance between two minor faces that octagon is adjacent; First steel plate and corresponding thereto as inner octagon minor face steel plate between distance d; Be fixed on the distance c of centre two steel plate on the second steel plate; Pin-and-hole diameter D on spud leg; Spud leg length e; Spud leg side edge length f; The stressed F of single pin-and-hole on spud leg ₁; The side force F that spud leg bears ₂;

2) according to step 1) the middle spud leg model parameter defined, set up spud leg solid model;

3) for step 2) in set up spud leg solid model carry out analysis pre-treatment;

4) to step 2) the middle spud leg solid model applying side force F set up ₂, downward gravity F is applied to each pin-and-hole on spud leg ₁, fixed constraint is set to bottom spud leg simultaneously;

5) design variable is defined; Vertical distance a between adjacent two minor faces of definition octagon, the first steel plate and corresponding thereto as inside octagon minor face steel plate between distance d, centre two steel plate be fixed on the second steel plate distance c be design variable;

6) definition constraint; The computer capacity of design variable a is: 0 ~ (b-D)/2, define its material calculation; The computer capacity of design variable d is: 0 ~ a, defines its material calculation; The computer capacity of design variable c is: define its material calculation; The designing quality m of definition spud leg is less than maximal value M; The maximum stress σ that definition spud leg bears is less than the maximum stress σ of steel plate materials _max;

7) objective definition function; The deflection Δ x of spud leg is defined as objective function;

8) be optimized analysis and draw size optimum solution; For design variable composes initial design values, carry out the finite element analysis of octagon pile leg structure, obtain the initial value of deflection Δ x; In units of material calculation, carry out iteration optimization to design variable, { functional digraph of a, d, c} obtains design variable set of dimensions { a, d, c} corresponding when Δ x is minimum value according to functional digraph to design variable set of dimensions to obtain objective function Δ x.

2. method according to claim 1, is characterized in that, step 3) described in analyze pre-treatment and comprise: definition unit type, definition material attribute, definition unit size and definition unit shape.