CN103617333B - Ocean platform floating holder installation shock analog analysing method - Google Patents
Ocean platform floating holder installation shock analog analysing method Download PDFInfo
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Abstract
The invention provides a kind of ocean platform floating holder installation shock analog analysing method, impact simulation is completed by means of existing large-scale analysis software ANSYS/AQWA, take full advantage of the powerful structural modeling of existing software function, large-scale buoyancy aid implementing hydrodynamic analysis and mooring system coupling dynamic analysis ability, effectively achieve Fast simulation and analysis that impact between barge and jacket is installed in floating holder.Ocean platform of the present invention floats holder installation rigid collision analogy method can simulate floating rigid collision power of holding in the palm in installation process, quickly and accurately for the floating holder mounting design of ocean platform provides scientific basis.Meanwhile, by changing the force-deflection curve of fender, also can analyze the impact simulation problem of other type, there is larger using value.
Description
Technical field
The present invention relates to a kind of ocean platform based on ANSYS/AQWA floating holder installation shock analog analysing method, belong to oceanographic engineering field engineering field.
Background technology
Along with continuing to increase of Marine oil and gas resource exploitation dynamics, ocean platform forward maximizes, synthesization future development, and the overall weight of platform is also in continuous increase.Offshore platform structure is divided into bottom bracing structure (jacket) and upper chunk.The general prefabricated construction by land of offshore platform structure, then transports to sea and installs.At present, the Attention problems of ocean platform mainly contains two class methods: derrick barge lifting and floating holder are installed.Due to the restriction by the factors such as derrick barge Lifting Capacity and construction operation environment, often need large-scale crane ship in engineering or large module be divided into some pieces to install.On the one hand, because oceanographic engineering large-scale crane ship is considerably less, therefore adopt large-scale crane ship that the cost that ocean platform can increase offshore construction operation is installed; On the other hand, if lifted by large module piecemeal, then can increase the time of chunk sea connection debugging, expense and risk.And ocean platform floats the Attention problems problem that holder installation solves super large, overweight chunk, avoid the loaded down with trivial details job procedure adopting piecemeal lifting mount scheme to cause, decrease the marine time connecting debugging, just playing a part more and more important in Offshore Platform Attention problems.
The floating holder of ocean platform is installed, and refers to and sails big uncork jacket notch into by the installation barge of delivery upper chunk, by regulating the trim of barge, utilizing buoyancy that upper chunk is floated holder and being installed on jacket thus the process completing Attention problems.Typical ocean platform sea floating holder installation process mainly comprises: (1) is installed barge and sailed jacket notch into; (2) centering in place: regulate barge position to make upper chunk rest on directly over jacket, the pile top of chunk and spud leg coupling device precise alignment; (3) docking operation: barge ballast sinks, and chunk pile top contacts with jacket spud leg until upper chunk weight is transferred on jacket completely; (4) barge is withdrawn: barge continue ballast sink recession from.
In ocean platform floating holder installation process, floating holder is installed barge and can be collided with the spud leg of jacket unavoidably, causes damage to installation barge and jacket structure, thus brings potential safety hazard to ocean platform installation exercise.The function that existing software ANSYS ANSYS/AQWA does not have direct collision to simulate, correct analog computation is floated holder and is installed the impact crash power between barge and jacket spud leg and take necessary safeguard procedures then to seem most important.
Summary of the invention
The present invention solves existing software ANSYS ANSYS/AQWA to float the rigid collision problem of holding in the palm and installing between barge and jacket by direct modeling ocean platform, propose the floating holder of a kind of ocean platform based on ANSYS/AQWA and install rigid collision analog analysing method, it is achieved by the following technical solutions:
A kind of ocean platform floating holder installation shock analog analysing method, comprises the steps:
A, to set up jacket-floating holder based on software ANSYS ANSYS barge-mooring system model of coupling is installed;
B, spherical fender unit is set;
B1, radius and the installation site of spherical fender unit are set at ANSYS/AQWA;
B2, in ANSYS/AQWA, carry out the setting of fender cell attribute, input spud leg force-deflection curve;
C, carry out floating holder barge-mooring system coupling dynamic analysis is installed;
D, in destination file, read the stressed of fender unit, be floating holder and impact between barge and jacket is installed.
Further, when flexible impact is simulated, the actual loading-deformation curve of the fender product that the force-deflection curve in described B2 step provides for manufacturer.
Further, in described B1 step, spherical fender unit is arranged on jacket spud leg center, and the radius of spherical fender unit is set to the radius of spud leg.
Further, when rigid collision is simulated, the force-deflection curve in described B2 step obtains as follows:
B21, ANSYS static structural analysis is utilized to calculate spud leg force-deflection curve;
B22, polynomial curve fitting is carried out to spud leg force-deflection curve, obtain the multinomial coefficient representing this curve.
Compared with prior art, advantage of the present invention and good effect as follows:
(1) impact simulation can come by means of existing large-scale analysis software ANSYS/AQWA, take full advantage of the powerful structural modeling of existing software function, large-scale buoyancy aid implementing hydrodynamic analysis and mooring system coupling dynamic analysis ability, effectively achieve Fast simulation and analysis that impact between barge and jacket is installed in floating holder;
(2), in ocean platform floating holder installation work, swaying fender is all be arranged in rows in the topside that barge is installed in floating holder, to cushion the impact of barge to jacket.And in ANSYS/AQWA, only have spherical fender unit, if fender to be arranged on when simulating the both sides of barge, the real-time that impact is simulated and validity cannot be ensured.Therefore in the present invention, spherical fender unit is arranged on jacket spud leg, thus ensure that the validity of barge and jacket spud leg impact simulation is installed in floating holder;
(3) the stress deformation curve for jacket spud leg owing to inputting in fender unit when rigid collision is simulated, simulates the collision of barge and jacket leg, impact simulation analysis is tallied with the actual situation more with this.
In sum, ocean platform of the present invention floats holder installation rigid collision analogy method and can simulate floating rigid collision power of holding in the palm in installation process quickly and accurately, for the floating holder mounting design of ocean platform provides scientific basis.Meanwhile, by changing spud leg force-deflection curve, also can analyze the impact simulation problem of other type, there is larger using value.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is ocean platform jacket model in the embodiment of the present invention;
Fig. 2 is floating holder barge model in the embodiment of the present invention;
Fig. 3 is ocean platform upper chunk model in the embodiment of the present invention;
Fig. 4 is that in the embodiment of the present invention, barge-upper chunk built-up pattern is installed in floating holder;
Fig. 5 is that in the embodiment of the present invention, barge mooring system model is installed in floating holder;
Fig. 6 is ocean platform jacket in the embodiment of the present invention-floating holder barge-mooring system analytical model;
Fig. 7 is fender installation site schematic diagram in the embodiment of the present invention;
Fig. 8 is fender force-deflection curve in the embodiment of the present invention;
Fig. 9 is the impact of barge and jacket leg in the embodiment of the present invention.
Embodiment
The function that software ANSYS ANSYS/AQWA does not have direct collision to simulate, provide only a fender unit (i.e. fender unit) in this software, the stress deformation problem of very large floating structure in motion process on this fender unit can be analyzed.
Based on above-mentioned, the present invention proposes a kind of ocean platform floating holder installation shock analogy method, comprises the steps:
A, according to design drawing, set up jacket-floating holder based on software ANSYS ANSYS and barge-mooring system model of coupling is installed;
B, spherical fender unit is set;
B1, arrange spherical fender unit at jacket spud leg center, the radius of spherical fender is set to the radius of spud leg;
B2, ANSYS static structural analysis is utilized to calculate spud leg force-deflection curve;
B3, polynomial curve fitting is carried out to spud leg force-deflection curve, obtain the multinomial coefficient representing this curve;
B4, in ANSYS/AQWA, carry out the setting of fender cell attribute, input represents the multinomial coefficient of spud leg force-deflection curve, thus sets the force-deflection attribute of fender unit, and the rigid collision simulation completing fender unit is arranged.
It should be noted that, when step B4 fender cell attribute is arranged, can input the actual loading-deformation curve of the rubber fender product that manufacturer provides equally, then the flexible impact simulation completing fender unit is arranged.
C, carry out floating holder barge-mooring system coupling dynamic analysis is installed;
D, in destination file, read the stressed of fender unit, be floating holder and impact between barge and jacket is installed;
Below in conjunction with practical application, the present invention's analytic process when rigid collision is simulated is described:
One, set up ocean platform jacket-floating holder and barge-mooring system analytical model is installed
Float downward in order to analysis environments load action and hold in the palm the rigid impact power of installation barge and jacket leg, first need to set up ocean platform jacket-floating holder and barge-mooring system analytical model is installed.
1. set up jacket model
According to design drawing, ANSYS pre-processing module is utilized to set up ocean platform jacket model.Ocean platform jacket in the embodiment of the present invention is 6 leg structures, as shown in Figure 1.The orthogonal layout of main pipe, spud leg diameter is 1986mm, wall thickness 45mm.Planar dimension is 32m × 34m, and have crossbeam direction to be 32m, opening direction is 34m.
2. set up floating holder and barge model is installed
According to barge basic document and table of offsets data, ANSYS/AQWA is utilized to set up barge model.It is 122.45m that barge overall length is installed in floating holder, and molded breadth is 30.5m, and moldeed depth is 7.6m, as shown in Figure 2.Coordinate system is as follows: x-axis points to bow, and y-axis points to barge larboard, and straight up, true origin is positioned at barge ship midship Water Plane place (3.8m) to z-axis.Adopt quadrilateral constant unit stress and strain model hull, divide 1318 unit altogether.
3. set up upper chunk model
According to design drawing, ANSYS pre-processing module is utilized to set up ocean platform upper chunk model.The ocean platform upper chunk that floating holder is installed is made up of deck and 6 root posts, as shown in Figure 3.Main deck is three layers, and planar dimension is 46m × 40m, floor height 8m.Chunk top layer is established loop wheel machine 2, the erection weight of upper chunk is 4200 tons.The ocean platform upper chunk model that ANSYS pre-processing module is set up is imported in ANSYS/AQWA, and barge is installed combines with floating holder, formed and floatingly hold in the palm installation barge-upper chunk built-up pattern, as shown in Figure 4.
4. set up mooring system model
Set up floating holder according to designing requirement and barge-mooring system analytical model is installed.Mooring system by 8 diameters be 60mm, the anchor chain of equal length forms, anchor chain in atmosphere quality is 71.77 kg/m, and in water, quality is 62.44 kg/m, and anchor chain rigidity EA is 26925t, and Fracture Force is 3144.82KN.Utilize AQWA-DRIFT module to carry out mooring system modeling, in AQWA, floating holder installs the detailed layout of barge-mooring system as shown in Figure 5, and in figure, institute mark digital is the horizontal length of mooring system.
5. set up jacket-floating holder and barge-mooring system analytical model is installed
The ocean platform jacket model set up above, floating holder are installed barge-mooring system analytical model and combined, obtains the system, coupled Dynamic Analysis Model simulated for floating holder installation barge and jacket leg rigid impact power, as shown in Figure 6.
Two, spherical fender unit is set
In ANSYS/AQWA model, by arranging that spherical fender simulates the rigid collision between ship side and jacket spud leg on jacket six spud legs.When floating holder installation barge moves under ocean environmental loads effect, can collide with fender, thus the stressed of fender can be calculated, be impact force.
1. the center of spherical fender is arranged on jacket spud leg center, and the radius of spherical fender is set to the radius of spud leg, fender installation site as shown in Figure 7.
2. the jacket model utilizing ANSYS pre-processing module to set up obtains spud leg force-deflection curve.Load application step by step on spud leg, and the displacement deformation of spud leg under calculating every grade of load action, thus the force-deflection curve of spud leg can be obtained, as shown in Figure 8.
3. in AQWA/DRIFT, carry out the setting of fender cell attribute, input force-deflection curve, the rigid mould completing fender unit proposes puts.
Three, carry out floating holder and barge-mooring system coupling dynamic analysis is installed
1. in ANSYS/AQWA, arrange the environmental parameter required for calculating, as wave height 1.5m, the spectrum peak cycle is 6.4s, and wave direction is 90 ° of incidences, and calculating duration is 3 hours, and time step is 0.5s etc.
2. carry out coupling dynamic analysis, wait end to be calculated.
Four, the stressed of fender unit is read;
After ANSYS/AQWA calculating terminates, open and calculate the file that the suffix produced is " PLT ", can obtain the stressing conditions of fender unit in post-processing module AQWAGS, as shown in Figure 9, this is the impact force of floating holder barge and jacket.
Being more than analog analysing method during rigid collision, for flexible impact, only when arranging fender cell attribute, actual loading-deformation curve that manufacturer provides need being adopted.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, every above embodiment is done according to technical spirit of the present invention any simple modification, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (1)
1. an ocean platform floating holder installation shock analog analysing method, is characterized in that comprising the steps:
A, to set up jacket-floating holder based on software ANSYS ANSYS barge-mooring system model of coupling is installed;
B, fender unit is set;
B1, the radius that spherical fender unit is set in ANSYS/AQWA and installation site;
B2, in ANSYS/AQWA, carry out the setting of fender cell attribute, input spud leg force-deflection curve;
C, carry out floating holder barge-mooring system coupling dynamic analysis is installed;
D, in destination file, read the stressed of fender unit, be floating holder and impact between barge and jacket is installed;
In described B1 step, spherical fender unit is arranged on jacket spud leg center, and the radius of spherical fender unit is set to the radius of spud leg;
When rigid collision is simulated, the force-deflection curve in described B2 step obtains as follows:
B21, in ANSYS software, set up jacket model according to model data, load application step by step on spud leg, and the displacement deformation of spud leg under calculating every grade of load action, thus obtain spud leg force-deflection curve;
B22, polynomial curve fitting is carried out to spud leg force-deflection curve, obtain the multinomial coefficient representing this curve.
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| CN104390588B (en) * | 2014-11-19 | 2017-09-26 | 上海交通大学 | A kind of real-time monitoring system for floating support mounting |
| CN106777555A (en) * | 2016-11-29 | 2017-05-31 | 中国船舶工业集团公司第七0八研究所 | A kind of Ship Structure Impact Resisting Capability appraisal procedure that fast curve is hit based on the limit |
| CN107423486B (en) * | 2017-06-16 | 2020-09-11 | 哈尔滨工程大学 | Modeling simulation method for floating-in-ship installation operation model in ship-entering stage |
| CN108021751B (en) * | 2017-12-05 | 2021-03-16 | 中海石油气电集团有限责任公司 | Simulation integrated system for berthing and mooring of LNG ship |
| CN109002580A (en) * | 2018-06-20 | 2018-12-14 | 中海石油(中国)有限公司 | A kind of ocean platform upper chunk area predictor method |
| CN109726359B (en) * | 2018-12-05 | 2023-05-12 | 中国船舶工业集团公司第七0八研究所 | Ship body head external floating slamming parallel computing method based on three-dimensional model |
| CN110826290B (en) * | 2019-10-31 | 2021-07-20 | 中国海洋大学 | Safety early warning method for offshore floating system |
| CN111504599B (en) * | 2020-04-23 | 2021-04-02 | 天津大学 | Floating support installation test model and method based on T-shaped barge and rapid load transfer |
| CN113434974B (en) * | 2021-06-23 | 2022-09-06 | 海洋石油工程股份有限公司 | Method for analyzing strength of offshore fixed platform upper module and floating support structure thereof |
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