CN104021266A - Wind load calculation method suitable for ocean engineering ship - Google Patents
Wind load calculation method suitable for ocean engineering ship Download PDFInfo
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- CN104021266A CN104021266A CN201310067052.6A CN201310067052A CN104021266A CN 104021266 A CN104021266 A CN 104021266A CN 201310067052 A CN201310067052 A CN 201310067052A CN 104021266 A CN104021266 A CN 104021266A
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Abstract
The invention provides a wind load calculation method suitable for an ocean engineering ship. The wind load calculation method suitable for the ocean engineering ship comprises the steps that wind loads of rectangular modules, under the condition of different wind direction angles, with different length-width ratios are measured during a wind tunnel test, and a database of the wind loads, relative to the wind direction angles, of the rectangular modules with the different length-width ratios is established; the ocean engineering ship is scattered into different standardized structural element modules, the wind load of each standardized structural element module is calculated according to the database established in the first step and the interpolation method, and the wind loads obtained through calculation are superposed, so that the total wind load is obtained. According to the wind load calculation method suitable for the ocean engineering ship, the shape correction factor and the direction correction factor are introduced, and thus calculation of the wind loads of the modules existing in the oblique wind direction can be more accurate; the sheltering factor is further introduced, calculation of the wind loads existing under the condition that the multiple modules are sheltered by one another can be more accurate, and the wind load calculation method is suitable for calculating the wind load of the ocean engineering ship with upper devices arranged complicatedly and is particularly suitable for calculating wind loads of drilling ships with multiple drilling devices.
Description
Technical field
The present invention relates to a kind of wind load computing method, relate in particular to a kind of wind load computing method that are applicable to have the ocean engineering vehicle of numerous equipment layout.
Background technology
Wind load is a kind of important load that marine structure suffers during operation in ocean, in anchoring location or dynamically positioning, needs emphasis to consider.Different from common ship, ocean engineering vehicle, as being furnished with drilling outfit and the drilling well material of One's name is legion on the main deck of deepwater drilling ship, as derrick, rig floor, driller house, marine riser stockyard, drilling rod stockyard etc., its wind load suffering occupies sizable ratio in environmental load, is the load that needs emphasis to consider in dynamically positioning capability analysis.
At present, agent approach is the most frequently used method of estimation marine structure wind load.It is that total is separated into different standard element modules, calculate respectively the wind load of each standard element module, and then the load of each member that superposes obtains total wind load.
The wind load that the method is suitable for the simple conventional boats and ships of top facility calculates, and for this wind load with numerous equipment layout of ship unit, calculates conventionally and actual conditions differ larger.This is because the method has three deficiencies: the one, and when wind direction and module axis are when inconsistent, actual over against the module cross sectional shape of wind direction is prismatic, square shape coefficient may not be suitable for; The 2nd, agent approach has been ignored component specification length, and the direction of the wind load that module suffers of different length breadth ratios may not be consistent with wind direction; The 3rd, the method has been ignored the capture-effect between module, causes the calculated value of construction part module wind load of lower wind direction larger than actual value.
Therefore, those skilled in the art is devoted to develop a kind of wind load computing method of calculating accurate ocean engineering vehicle.
Summary of the invention
In view of above-mentioned the problems of the prior art, technical matters to be solved by this invention is that the wind load computing method of existing ocean engineering vehicle are accurate not.
A kind of wind load computing method that are applicable to ocean engineering vehicle provided by the invention, comprise the following steps:
Step 1, in wind tunnel test, is measured the wind load size of the rectangular module of the different length breadth ratios under different wind angles, and the wind load size of rectangular module of setting up different length breadth ratios is with respect to the database of wind angle;
Step 2, is separated into different standard element modules ocean engineering vehicle, utilize the database of step 1 formation and the wind load that method of interpolation is calculated respectively each standard element module, and then the wind load of superposition calculation obtains total wind load.
In a better embodiment of the present invention, in described step 1, be also included in wind tunnel test, direction to the wind load of the independent rectangular module of different length breadth ratios under different wind angles is measured, and the wind load direction of rectangular module of setting up different length breadth ratios is with respect to the database of wind angle.
In another better embodiment of the present invention, in described step 1, be also included in wind tunnel test, wind load to the lower wind direction module in two rectangular modules of the different spaces ratio under different wind angles is measured, and sets up the wind load of lower wind direction module with respect to the database of wind angle.
In another better embodiment of the present invention, the space of described two rectangular modules is than being the spacing of two rectangular modules and the ratio of yardstick.
In another better embodiment of the present invention, described ocean engineering vehicle is ship unit, workover barge or platform maintenance ship.
Compared with the conventional method, the good effect having has in the present invention:
Due to shape correction factor and the adjustment in direction coefficient introduced about the rectangular module of different length breadth ratios, make skew wind calculate more accurate to the wind load of lower module; And the further sheltering coefficient of introducing about lower wind direction module, the wind load that makes to have under the mutual circumstance of occlusion of numerous modules calculates more accurate, the wind load that is suitable for the complicated marine structure of top equipment layout calculates, and is particularly suitable for this class of ship unit and has the wind load calculating that numerous drilling outfits are arranged.
Accompanying drawing explanation
Fig. 1 is the computing module wind load schematic diagram of embodiments of the invention.
Embodiment
Below with reference to accompanying drawing, the present invention is done to concrete explaination.
Figure 1 shows that a width is that a length is the rectangular module wind-engaging load schematic of b, wherein V
2for test wind speed; F is the suffered wind-force of conventional module method lower module; F
realfor the suffered wind-force of module of embodiments of the invention, adopt the wind load computing formula of conventional module method to be:
In formula, C
wfor wind force coefficient (0.611), V
wfor wind speed (m/s), C
sfor shape coefficient, C
hfor height coefficient, A
i(α) be the frontal projected area of wind angle α lower module.
The present invention introduces shape correction factor k on this basis
w α, adjustment in direction coefficient C
w αwith sheltering coefficient C
shi, set up the wind load computing formula of improving agent approach, wind load size is:
Wind load direction is:
α
wi=α+C
wα(α,b/a)
Shape correction factor k
w αwith adjustment in direction coefficient C
w αby wind tunnel test, determined.In wind tunnel test, the independent rectangular module wind load of the different length breadth ratios size and Orientation under different wind angles is measured, set up shape correction factor and adjustment in direction coefficient with respect to the database of wind angle and module length breadth ratio.
During concrete this coefficient of calculating, according to the actual wind angle of module and length breadth ratio, adopt the method for interpolation to obtain, method of interpolation claims again " interpolation method ", is to utilize function f
(x)the functional value of some points in certain interval, makes suitable specific function, on these aspects, gets given value, on other aspects in interval by the value of this specific function as function f
(x)approximate value.
Sheltering coefficient C
shiby wind tunnel test, determined.In wind tunnel test, the different spaces under different wind angles is measured than the wind load of the lower wind direction module in (intermodule is apart from the ratio with module measure) two rectangular modules, set up sheltering coefficient with respect to the database of wind angle and module space ratio.During concrete this coefficient of calculating, according to the actual wind angle of module and space, than the method for employing interpolation, obtain.
In sum, the improvement agent approach of using wind load of the present invention to calculate, can solve the wind load computational problem of complex object, and can consider the capture-effect between object, thereby improves the precision that wind load calculates.
Above specific embodiments of the invention be have been described in detail, but it is just as example, the present invention is not restricted to specific embodiment described above.To those skilled in the art, any equivalent modifications that the present invention is carried out and alternative also all among category of the present invention.Therefore, equalization conversion and the modification done without departing from the spirit and scope of the invention, all should contain within the scope of the invention.
Claims (5)
1. wind load computing method that are applicable to ocean engineering vehicle, is characterized in that, comprise the following steps:
Step 1, in wind tunnel test, is measured the wind load size of the rectangular module of the different length breadth ratios under different wind angles, and the wind load size of rectangular module of setting up different length breadth ratios is with respect to the database of wind angle;
Step 2, is separated into different standard element modules ocean engineering vehicle, utilize the database of step 1 formation and the wind load that method of interpolation is calculated respectively each standard element module, and then the wind load of superposition calculation obtains total wind load.
2. wind load computing method as claimed in claim 1, it is characterized in that, in described step 1, be also included in wind tunnel test, direction to the wind load of the independent rectangular module of different length breadth ratios under different wind angles is measured, and the wind load direction of rectangular module of setting up different length breadth ratios is with respect to the database of wind angle.
3. wind load computing method as claimed in claim 1, it is characterized in that, in described step 1, be also included in wind tunnel test, wind load to the lower wind direction module in two rectangular modules of the different spaces ratio under different wind angles is measured, and sets up the wind load of lower wind direction module with respect to the database of wind angle.
4. wind load computing method as claimed in claim 3, is characterized in that, the space of described two rectangular modules is than being the spacing of two rectangular modules and the ratio of yardstick.
5. the wind load computing method as described in claim 1 to 4 any one, is characterized in that, described ocean engineering vehicle is ship unit, workover barge or platform maintenance ship.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310067052.6A CN104021266A (en) | 2013-03-01 | 2013-03-01 | Wind load calculation method suitable for ocean engineering ship |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310067052.6A CN104021266A (en) | 2013-03-01 | 2013-03-01 | Wind load calculation method suitable for ocean engineering ship |
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| CN104021266A true CN104021266A (en) | 2014-09-03 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105004503A (en) * | 2015-06-29 | 2015-10-28 | 中国海洋大学 | Self-elevating type offshore platform wind load coefficient test experimental system |
| CN106897517A (en) * | 2017-02-22 | 2017-06-27 | 中铁二院工程集团有限责任公司 | Line of high-speed railway gale monitoring optimizes automatic search method of arranging net |
| CN109885955A (en) * | 2019-03-01 | 2019-06-14 | 上海振华重工(集团)股份有限公司 | Wind load calculation method and computing system |
| CN112434363A (en) * | 2020-11-24 | 2021-03-02 | 国网江苏省电力有限公司电力科学研究院 | Method for rapidly judging worst position of power transmission tower in tornado wind field |
-
2013
- 2013-03-01 CN CN201310067052.6A patent/CN104021266A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105004503A (en) * | 2015-06-29 | 2015-10-28 | 中国海洋大学 | Self-elevating type offshore platform wind load coefficient test experimental system |
| CN106897517A (en) * | 2017-02-22 | 2017-06-27 | 中铁二院工程集团有限责任公司 | Line of high-speed railway gale monitoring optimizes automatic search method of arranging net |
| CN106897517B (en) * | 2017-02-22 | 2019-11-15 | 中铁二院工程集团有限责任公司 | Line of high-speed railway gale monitoring optimizes automatic search method of arranging net |
| CN109885955A (en) * | 2019-03-01 | 2019-06-14 | 上海振华重工(集团)股份有限公司 | Wind load calculation method and computing system |
| CN109885955B (en) * | 2019-03-01 | 2023-06-02 | 上海振华重工(集团)股份有限公司 | Wind load calculation method and calculation system |
| CN112434363A (en) * | 2020-11-24 | 2021-03-02 | 国网江苏省电力有限公司电力科学研究院 | Method for rapidly judging worst position of power transmission tower in tornado wind field |
| CN112434363B (en) * | 2020-11-24 | 2023-02-28 | 国网江苏省电力有限公司电力科学研究院 | Method for rapidly judging worst position of power transmission tower in tornado wind field |
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Application publication date: 20140903 |