CN101261177A - Active mode ocean platform mixing model test accomplishing method - Google Patents
Active mode ocean platform mixing model test accomplishing method Download PDFInfo
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- CN101261177A CN101261177A CNA2008100365518A CN200810036551A CN101261177A CN 101261177 A CN101261177 A CN 101261177A CN A2008100365518 A CNA2008100365518 A CN A2008100365518A CN 200810036551 A CN200810036551 A CN 200810036551A CN 101261177 A CN101261177 A CN 101261177A
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Abstract
The invention relates to a realizing method of an active offshore platform mixed model. A scale ratio and an intercepted water depth are determined according to the water depth that a water pool can simulate and the practical water depth under which the offshore platform works; the motion of a deep sea platform model is numerically calculated under a given sea environment condition at first; as the motion of a suspended chain mooring cable affects the motion of the platform and the length of the mooring cable is restricted by the dimension of the water pool, during the mixed model test, the mooring cable can be cut off; the motion of the cable at the cut-off section can be simulated by a set of real-time computer motion control system according to the theoretical calculation results. The realizing method of an active offshore platform mixed model has the effects and benefits that the practically required power characteristic of full water depth system is gained by a direct model test mean and a reliable multisystem coupling numerical calculation software and a numerical extrapolation method are not required, and is simple and feasible and has extremely high reliability.
Description
Technical field
What the present invention relates to is a kind of test implementation method of field of ocean engineering, specifically, is a kind of implementation method of active mode ocean platform mixing model test.
Background technology
Deep-sea plateform system technical sophistication, investment is big, risk is high, how more correctly obtaining its motion under harsh marine environment, stressed and deck, whether to go up technical feature such as wave very important, and these performance parameters are important evidence of decision and design offshore platform structure and related systems such as mooring, standpipe thereof.Oceanographic engineering circle is still consistent thinks that the result of physical experiments is the most reliable, and with this finally deciding as design, construction ocean platform.The physical experiments of ocean platform all is to carry out in can simulating the oceanographic engineering pond of marine environment, and the length of mooring line is subjected to the restriction of pond yardstick.When carrying out physical experiments, can use, earlier with the motion of numerical evaluation offshore platform model under given marine environment condition and stressed, again mooring line is blocked, use special way the motion of truncated position hawser to be simulated, can in the oceanographic engineering pond, test with larger-size model like this according to the Theoretical Calculation result.
At present, the mixing model test method of employing mainly contains two kinds: first kind of form is called the passive type mixing model test, only adopts passive type depth of water truncated system to carry out model test.Although can simulate static characteristics well, disadvantage is kinematic behavior and the damping that can not simulate mooring system and riser systems rightly, and in the actual depth of water with block the depth of water difference when big, will there be very big-difference in test findings and actual conditions.For remedying this defective, on the basis of passive type depth of water truncated system test, introduced aftertreatment numerical Analysis method, this is second kind of form of mixing model test method, can abbreviate " passive blocking+numerical simulation " method as.Data and result that this system applies depth of water truncation test obtains carry out numerical value reconstruct and verification in numerical evaluation software, numerical value is extrapolated to the actual depth of water then, calculate the kinematic behavior of actual full depth of water system.
Find through literature search prior art, " the deep-sea platform mixing model test method research that the equivalent depth of water is blocked " that Zhang Huoming etc. delivered on the 1st page of " oceanographic engineering " fourth phase in 2006, " passive blocking+numerical simulation " method is proposed in this article, depth of water system and full depth of water system model test have been carried out blocking, and having carried out the corresponding numerical value reconstruct of depth of water test and the numerical value of full depth of water system of blocking, concrete grammar is: 1) according to the mooring system characteristic of the full depth of water mooring system that blocks the depth of water is carried out the optimization simulation of static characteristics.2), carry out the irregular wave action test under the depth of water blocking, Measuring Oceanic platform motion and mooring line stressed to the mooring system of offshore platform model configuration simulation.3) because static characteristics has only been satisfied in the simulation of blocking depth of water mooring system, to block for this reason numerical value under the depth of water situation the tentative calculation of repeatedly iteration and with the model test result relatively, purpose is to choose the kinematic behavior data of relevant hydrodynamic force coefficient and system.4), the stressed of the motion of deep-sea platform and mooring line tried to achieve with numerical computation method by the ocean platform system of the full depth of water under irregular wave action according to the kinematic behavior data of above-mentioned hydrodynamic force coefficient of choosing and mooring system.Its weak point is: this method needs quite reliable multisystem coupling numbers value computation software and numerical value Extrapolation method to do support, is quite difficult.In addition, the kinematic behavior of actual needed full depth of water system is not to obtain by direct model test means, so its confidence level is not high.
Summary of the invention
The objective of the invention is at the deficiency that exists in the background technology, a kind of implementation method of active mode ocean platform mixing model test is provided, directly obtain the kinematic behavior of actual needed full depth of water system by model test, preferably resolve the problem in " passive blocking+numerical simulation " method, improved the fiduciary level of mixing model test.
The present invention is achieved by the following technical solutions, the inventive method is as follows: the depth of water that can simulate by the pond and the actual depth of water of ocean platform work, determine a scaling factor and block the depth of water, earlier with the motion of numerical evaluation deep-sea platform model under given marine environment condition, since the motion of stretched wire mooring line and can have influence on the motion of platform, and the length of mooring line is subjected to the restriction of pond yardstick.In the time of in mixing model test, mooring line can be blocked, the available cover mechanism of the motion of its truncated position hawser carries out real time modelling, and this mechanism is simulated according to the Theoretical Calculation result by the real-time computer kinetic control system.
The inventive method specifically comprises the steps:
Step 1: the depth of water that can simulate according to experimental tank and the actual depth of water of ocean platform work, choose and block the depth of water, and definite scaling factor;
Step 2: utilize the essential characteristic of ocean platform system and ocean platform system suffered marine environment condition in real work, ocean platform in the real work is carried out implementing hydrodynamic analysis when the full depth of water under unit wave height regular waves, can obtain the hydrodynamic parameter database under the ocean platform frequency domain, comprising additional mass under each frequency and ratio of damping, second order mean wave power and second order mean wave power transport function, by the Maeve Cummings theory, according to hydrodynamic parameter database under the frequency domain that calculates, change the method for time domain by frequency domain, utilize the DYFLOAT software of Dutch MARIN pond exploitation, set up the equation of motion of ocean platform time domain simulation, and adding environmental baseline and mooring line, simulate the motion of ocean platform system in the real work, the movable information of depth of water place mooring line is blocked in acquisition, i.e. pitching (directions X), rolling (Y direction), go through when hanging down the motion of swinging (Z direction);
Step 3: according to the scaling factor of choosing in the step 1 with block the depth of water, make required clean cut system offshore platform model in the mixing model test, and determine the simulation marine environment condition in its test.
Step 4:,, be converted into the movable information of mooring line truncation part in the mixing model test according to fixed scaling factor with the movable information that blocks depth of water place mooring line that obtains in the step 2;
Step 5: the simulation marine environment condition in experimental tank described in the manufacturing step three, meanwhile, when being moved, goes through the mooring line model truncation part described in the step 4 input real-time computer kinetic control system, change pulse signal earlier into, pulse signal drives servomotor, the motion of drive screw body, the motion of the rotating band movable wire bar top shoe of screw mandrel, slide block links to each other with the mooring line truncation part, finish the motion of mooring line truncation part in the mixing model test, carry out active mode ocean platform mixing model test.
The present invention has substantive distinguishing features and marked improvement, obtain the kinematic behavior of the actual needed full depth of water of method system by direct model test means, do not need reliable multisystem coupling numbers value computation software and numerical value Extrapolation method to do support, simple, confidence level is high, preferably resolves the problem in " passive blocking+numerical simulation " method.
Description of drawings
Fig. 1 blocks the mooring line motion calculation simulated technological process figure of depth of water place;
Fig. 2 blocks depth of water place mooring line movable information; Wherein, scheme (a) and go through when depth of water place directions X moves for blocking, figure (b) goes through when the Y of depth of water place direction is moved for blocking, and figure (c) goes through when the Z of depth of water place direction is moved for blocking;
Fig. 3 active mode ocean platform mixing model test process flow diagram;
The analog result of Fig. 4 mooring line model truncation part motion.Scheme (a) and go through simulation when depth of water place directions X moves for blocking, figure (b) goes through simulation for blocking when the Y of depth of water place direction is moved, and figure (c) goes through simulation for blocking when the Z of depth of water place direction is moved.
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Step 1: according to the actual depth of water H of ocean platform work
0=1500 meters, the depth of water H that experimental tank can be simulated
1=4.0 meters, choose and block depth of water H
2=400 meters, determine a scaling factor λ=H
2/ H
1=100;
Step 2: as shown in Figure 2, utilize the ultimate principle of three-dimensional potential flow theories, the DIFFRAC software of the Dutch MARIN company research and development of adopting that Shanghai Communications University's THE STATE KEY LABORATORY OF OCEAN ENGINEERING buys carries out implementing hydrodynamic analysis to the ocean platform in the real work when the full depth of water under unit wave height regular waves, can obtain the hydrodynamic parameter database under the ocean platform frequency domain, comprising additional mass under each frequency and ratio of damping, second order mean wave power, second order mean wave power transport function;
Step 3: by the Maeve Cummings theory, change the method for time domain by frequency domain, the hydrodynamic parameter database is converted into the hydrodynamic parameter storehouse under the time domain under the frequency domain that step 2 is calculated, go through when comprising additional mass, ratio of damping, Second Order, add the marine environment condition, set up the numerical model of ocean platform time domain simulation, this model comprises ocean platform, full depth of water mooring system.In input marine environment condition (wind, wave, stream) time, gone through, and goes through the top tension force Shi Li of mooring line etc. during motion that DYNFLOAT just can export ocean platform as required.For the present invention, parameter is set, go through when making the three-dimensional motion that every mooring line of DYNFLOAT output blocks to point out,
Promptly obtain to block depth of water H
2The movable information of=400 meters mooring lines, is gone through when hanging down the motion of swinging (Z direction) at i.e. pitching (directions X), rolling (Y direction), and simulation T.T. is 3600 seconds, and time step is 0.25 second, the movable information that blocks depth of water place mooring line as shown in Figure 3;
Step 4: as shown in Figure 4, according to the scaling factor λ that chooses in the step 1, with marine environment condition, ocean platform size, block mooring line and the motion thereof of the depth of water more than 400 meters and the time go through, be converted into when the needed simulation marine environment of active mode ocean platform mixing model test condition, offshore platform model size, mooring line are blocked model and truncation part motion thereof and go through, and make offshore platform model and mooring line blocks model;
Step 5: in experimental tank, make above-mentioned simulation marine environment condition, meanwhile, go through input real-time computer kinetic control system when above-mentioned mooring line model truncation part is moved and (adopt prior art, comprise the hardware and software two large divisions, hardware is the servo control mechanism that can simulate the truncation points three-dimensional motion, comprises three AC servo motor and other matching components.Go through three AC servo motor of real-time generation move needed pulse signal and control signal when software can be according to the three-dimensional motion of input), change pulse signal earlier into, pulse signal drives servomotor, the motion of drive screw body, the motion of the rotating band movable wire bar top shoe of screw mandrel, slide block links to each other with the mooring line truncation part, finish the motion of mooring line truncation part in the mixing model test, carry out active mode ocean platform mixing model test, analog result as most important mooring line model truncation part motion in the accompanying drawing 4 resultant active mode ocean platform mixing model tests, difference comparison diagram 2-(a) and 4-(a), 2-(b) and 4-(b), 2-(c) and 4-(c), to calculate result that simulation softward calculates divided by scaling factor λ, just the analog result of this mooring line model truncation part motion has well met by calculating the result that simulation softward calculates as can be seen, the implementation method of this active mode ocean platform mixing model test obtains the kinematic behavior of the actual needed full depth of water of method system by direct model test means, do not need reliable multisystem coupling numbers value computation software and numerical value Extrapolation method to do support, simple, confidence level is high.
Claims (4)
1, a kind of implementation method of active mode ocean platform mixing model test, it is characterized in that, determine a scaling factor and block the depth of water by pond and ocean platform actual conditions, earlier with the motion of numerical evaluation deep-sea platform model under given marine environment condition, in the time of in mixing model test, mooring line is blocked, and the motion of its truncated position hawser is simulated according to the Theoretical Calculation result with a cover real-time computer kinetic control system.
2, the implementation method of active mode ocean platform mixing model test according to claim 1 is characterized in that, comprises the steps:
Step 1: the depth of water that can simulate according to experimental tank and the actual depth of water of ocean platform work, choose and block the depth of water, and definite scaling factor;
Step 2: utilize the essential characteristic of ocean platform system and ocean platform system suffered marine environment condition in real work, simulate the motion of ocean platform system in the real work, the movable information of depth of water place mooring line is blocked in acquisition, i.e. go through when pitching, rolling, vertical motion of swinging;
Step 3: according to the scaling factor of choosing in the step 1 with block the depth of water, make required clean cut system offshore platform model in the mixing model test, and determine the simulation marine environment condition in its test;
Step 4:,, be converted into the movable information of mooring line truncation part in the mixing model test according to fixed scaling factor with the movable information that blocks depth of water place mooring line that obtains in the step 2;
Step 5: go through when simulation marine environment condition in experimental tank described in the manufacturing step three and the motion of the mooring line model truncation part described in the step 4, finish the motion of mooring line truncation part in the mixing model test, carry out active mode ocean platform mixing model test.
3, the implementation method of active mode ocean platform mixing model test according to claim 2, it is characterized in that, described marine environment condition, be meant: the ocean platform in the real work is carried out implementing hydrodynamic analysis when the full depth of water under unit wave height regular waves, obtain the hydrodynamic parameter database under the ocean platform frequency domain, comprising additional mass under each frequency and ratio of damping, second order mean wave power and second order mean wave power transport function, by the Maeve Cummings theory, according to hydrodynamic parameter database under the frequency domain that calculates, change the method for time domain by frequency domain, utilize DYFLOAT software, set up the equation of motion of ocean platform time domain simulation, and add environmental baseline and mooring line.
4, the implementation method of active mode ocean platform mixing model test according to claim 2, it is characterized in that, in the experimental tank of step 5, input real-time computer kinetic control system, change pulse signal earlier into, pulse signal drives servomotor, drives the screw body motion, the motion of the rotating band movable wire bar top shoe of screw mandrel, slide block links to each other with the mooring line truncation part.
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| CN102141775A (en) * | 2011-01-25 | 2011-08-03 | 天津大学 | Deep-sea platform mooring system parametric excitation-internal resonance coupled vibration analysis and control method |
| CN102433867A (en) * | 2011-10-20 | 2012-05-02 | 中国科学院力学研究所 | Design method of deepwater semisubmersible drilling platform or production platform |
| CN102433867B (en) * | 2011-10-20 | 2014-11-26 | 中国科学院力学研究所 | Design method of deepwater semisubmersible drilling platform or production platform |
| CN104359700A (en) * | 2014-12-02 | 2015-02-18 | 中国海洋石油总公司 | FPSO (Floating Production Storage and Offloading System) crude oil transportation system coupling property testing method |
| CN104359700B (en) * | 2014-12-02 | 2017-02-08 | 中国海洋石油总公司 | FPSO (Floating Production Storage and Offloading System) crude oil transportation system coupling property testing method |
| CN105701279A (en) * | 2016-01-07 | 2016-06-22 | 中国海洋大学 | Non-classic structure dynamic response frequency domain method |
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| CN106092500A (en) * | 2016-06-02 | 2016-11-09 | 舟山正恒环保科技有限公司 | A kind of circular column leg Offshore Platform analog synthesis monitoring device |
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| CN107091727B (en) * | 2017-05-11 | 2019-05-21 | 哈尔滨工程大学 | Active control mooring trial test device in a kind of air |
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