CN101905737B - Test inertia regulating method of FLNG liquid tank sloshing model - Google Patents
Test inertia regulating method of FLNG liquid tank sloshing model Download PDFInfo
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Abstract
The invention relates to a test inertia regulating method of an FLNG liquid tank sloshing model, belonging to the technical field of ocean engineering. The test inertia regulating method of the FLNG liquid tank sloshing model comprises the following steps of: measuring the quality characteristics of a ship model during idle load; establishing an idle load quality characteristic model A; establishing a liquid tank quality characteristic model B1 during liquid ballast; establishing a residual quality characteristic model C; establishing a liquid tank quality characteristic model B2 during solid ballast; placing an empty ship model into water, and arranging corresponding mould weights in the empty ship model according to the residual quality characteristic model C; when liquid ballast is regulated, infusing liquid which has the same quantity as materials loaded in the liquid tank quality characteristic model B1 into a liquid tank; and when solid ballast is regulated, arranging the corresponding mould weights in the liquid tank according to the liquid tank quality characteristic model B2. The invention only needs to measure the quality characteristics of the empty ship model on an inertia regulating bracket, can accurately regulate the quality characteristics during the liquid ballast, enhances the accuracy of inertia regulation, reduces the system errors and has easy operation and very low cost.
Description
Technical field
What the present invention relates to is a kind of method of field of ocean engineering, specifically the test inertia regulating method of a kind of FLNG (large-scale floating liquefied natural gas carrier) sloshing model.
Background technology
The shortage of oil resources and to the continuous growth of energy demand causes the large-sized model exploitation of offshore oil and gas field, and schedule has also been put in the exploitation in gas field, limit, ocean simultaneously.In order to develop cost-effectively the marginal field, ocean, the concept of large-scale floating liquefied natural gas carrier (hereinafter to be referred as the FLNG ship) has been proposed in the world.Have the FLNG permanent mooring of bulkiness in the operation marine site, liquid containing situation in the marine environment condition that experience is complicated and various cabin.Abominable marine environment condition will cause the strenuous exercise of FLNG, thereby cause rocking of liquid in the cabin.In the cabin, liquid rocks the motion aggravation that also will cause hull and the destruction of liquid tank inwall.Therefore, the situation that affects that in the cabin, liquid sloshing responds ship motion becomes one of the key factor that must consider in the FLNG hull design.
By model test, can comparatively comprehensively observe rocking phenomenon and on the impact of FLNG ship motion, obtaining comparatively failure-free test results of liquid in the cabin.Test results can be used to the design accuracy of Calibration Theory and numerical model.The precondition that the water pool model Success in Experiment is carried out is exactly the accurate adjusting of FLNG model inertia.The method of traditional measurement inertia is to utilize three-line pendulum to measure, and this method systematic error is too large, can not satisfy the needs that ship model is measured.
Through existing literature search is found, Chinese patent application number is: 200810114716.9, patent name is: the dynamic simulation novel principle of inertia, this technology related inertia simulation system comprises inertia dish, electrical motor, frequency converter, torque sensor and rotary encoder.Wherein the inertia dish is used for simulated aircraft runway and aircraft part inertia.In the aircraft brake experimentation, electrical motor can apply to the inertia dish moment of positive and negative both direction, to regulate the dynamic characteristics of inertia dish, realizes the electric analogue of mechanical inertia, the whole inertia of experimental system can smooth adjustment, the brake system that therefore can test the different quality aircraft.This inertia simulation technology can realize the mobility type analogy to inertia, but can't realize the adjusting to the FLNG ship model inertia.Its weak point is mainly manifested in: (1) due to the FLNG hull and displacement very huge, when adopting conventional scaling factor to carry out model experiment, ship model size and weight are excessive, exceed the scope of general inertia adjusting stand; Adopt the super large scaling factor can be with the model weight control within the load-bearing scope of existing inertia adjusting stand, yet the water pool model experimental result that this kind mode obtains have larger error.The accuracy that when (2) existing inertia regulative mode can guarantee solid ballast, inertia is regulated, but the accuracy that when being difficult to guarantee liquid ballast, inertia is regulated.And the accuracy that inertia is regulated is the precondition that the water pool model Success in Experiment is carried out, and inertia is regulated inaccurate and model experiment that carry out, and its result will not have reference value.Investigate sloshing to the impact of ship motion response, must be for adopting respectively liquid ballast and two kinds of situations of solid ballast to test under FLNG same loading situation.The inertia that how to guarantee ship model under two kinds of ballast modes of liquid ballast and solid ballast keeps in full accord, is a very crucial technology.(3) existing inertia regulative mode requires multiple-person cooperative work just can complete the adjusting of inertia, the labor intensive resource.
Summary of the invention
The object of the invention is to overcome the above-mentioned deficiency of prior art, a kind of test inertia regulating method of FLNG sloshing model is provided.The present invention only needs to measure the mass property of clean ship mould on inertia adjusting stand, can realize the adjusting to the mass property of dummy ship under the adjusting of the mass property of dummy ship under the solid ballast mode and liquid ballast mode, and degree of regulation is higher, and is simple to operate, and cost is lower.
The present invention is achieved by the following technical solutions, the present invention includes following steps:
The first step, the mass property when utilizing existing inertia adjusting bracket to measure the ship model zero load.
In the first step, described mass property is weight, center-of-gravity position, radius of turn, rotor inertia, rolling, the pitching of ship model and the natural period parameter of hanging down and swinging.
Second step, the idle load quality characteristic model A when setting up the ship model zero load.
Described idle load quality characteristic model A is that to adopt Finite Element Method to advance vertical, and its mass property is exactly the mass property that the first step is measured.
The 3rd step, set up the liquid tank mass property Model B 1 when adopting liquid ballast, record the quality of each liquid tank Loaded goods.
Described liquid is liquefied natural gas, perhaps replaces with sheet material.
Free surface and the shape of tank bulkhead around the geometric figure that forms as sheet material of described sheet material liquid in the cabin, the thickness take liquid tank inwall length as sheet material, the density of the liquid that loads in the cabin is the density of sheet material.
Described liquid tank mass property Model B 1 is to adopt Finite Element Method to set up, and its mass property is provided by the weight calculation sheet of ship model.
The 4th step, set up residual quality characteristic model C, record position and the quality of each mass.
Described residual quality characteristic model C is: keep idle load quality characteristic model A and liquid tank mass property Model B 1 constant, by quantity, specification and the position of quality of regulation piece, make idle load quality characteristic model A, liquid tank mass property Model B 1 and residual quality characteristic model C sum equal mass property total in the weight calculation sheet of ship model.
The 5th step, set up the liquid tank mass property Model B 2 when adopting solid ballast, record position and the quality of each mass.
Described liquid tank mass property Model B 2, be: keep idle load quality characteristic model A and residual quality characteristic model C constant, by adjusting quantity, specification and the position of foundary weight, make total mass property in 2 and the weight calculation sheet that equal ship model of idle load quality characteristic model A, residual quality characteristic model C and liquid tank mass property Model B.
The 6th step, when carrying out the water pool model experiment, the clean ship model is put into water, position and quality according to each mass in residual quality characteristic model C, the corresponding foundary weight of discharging in the clean ship model, when carrying out the liquid ballast adjusting, inject the liquid identical with liquid tank mass property Model B 1 Loaded goods quality in liquid tank; When carrying out the solid ballast adjusting, according to position and the quality of each mass in liquid tank mass property Model B 2, the corresponding foundary weight of discharging in liquid tank.
Compared with prior art, the invention has the beneficial effects as follows: (1) the present invention has overcome model quality and the too little defective of size that existing inertia adjustment means is measured, and makes the water pool model experiment of carrying out very-large offshore structure under conventional scaling factor more easily realize.(2) the present invention has overcome the defective of existing inertia adjustment means dummy ship inertia can't the Measurement accuracy liquid ballast time, makes the experiment of FLNG sloshing water pool model be carried out smoothly, has realized that especially the employing liquid ballast carries out model experiment.(3) the present invention has improved the accuracy that inertia is regulated, and has reduced systematic error, and is simple to operate, and cost is very low.
The specific embodiment
Below method of the present invention is further described: the present embodiment is implemented under take technical solution of the present invention as prerequisite, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment
The present embodiment is before test, first yardstick, the physical size of FLNG, the concrete feelings of operating condition of test and the economy preference pattern scaling factor of test according to artificial pond, obtain the concrete size of FLNG ship model, thereby adopt glass-reinforced plastic material to make ship model, the inertia of ship model regulated specifically comprising the following steps:
The first step, the mass property when utilizing existing inertia adjusting bracket to measure the ship model zero load.
Adopt Chinese patent application number to be in the present embodiment: the digital inertia adjustable bracket of ship model described in 200310108551.1 carries out the measurement of mass property to the ship model of zero load.Described mass property is weight, center-of-gravity position, radius of turn, rotor inertia, rolling, the pitching of ship model and the natural period parameter of hanging down and swinging.
Second step, according to the mass property that the first step is measured, the idle load quality characteristic model A when adopting Finite Element Method to set up the ship model zero load.
In the 3rd step, according to the requirement of weight calculation sheet, the liquid tank mass property Model B 1 when adopting Finite Element Method to set up liquid ballast is write down the loaded-up condition of each liquid tank.
The present embodiment is only considered the mass property of the liquid that loads in liquid tank in setting up liquid tank model process, the mass property of liquid tank itself puts under in residual quality characteristic model to be considered.For the modeling of the liquid that loads in the cabin, use equal densities that can not be simple and the liquid of identical loading are considered, because can't obtain like this mass property of liquid.In this process, the liquid that loads in the cabin replaces with sheet material.Specific practice is: free surface and the shape of tank bulkhead around the geometric figure that forms as sheet material of liquid in the cabin, and the thickness take liquid tank inwall length as sheet material, the density of the liquid that loads in the cabin is the density of sheet material.In the cabin of building up with the method, the model of liquid can conveniently obtain the mass property fixedly time of liquid in the cabin.
The 4th step, keep idle load quality characteristic model A and liquid tank mass property Model B 1 constant, by adjusting quantity, specification and the position of mass, make idle load quality characteristic model A, liquid tank mass property Model B 1 and residual quality characteristic model C sum equal mass property total in the weight calculation sheet of ship model, thereby set up residual quality characteristic model C.
In the present embodiment, idle load quality characteristic model A and liquid tank mass property Model B 1 sum are less than the mass property of whole ship model, and need add a residual mass characteristic at this can be consistent with the expected value of model.In modeling process, replace the foundary weight in model experiment that the residual mass characteristic is regulated with mass, make that in clean ship model quality characteristic, cabin, liquid quality characteristic and residual mass characteristic sum and whole ship model mass property are consistent.Adjust complete after, record the particular location of each mass, in the water pool model experiment, replace mass with foundary weight.
The 5th step, keep idle load quality characteristic model A and residual quality characteristic model C constant, by adjusting quantity, specification and the position of mass, make total mass property in 2 and the weight calculation sheet that equal ship model of idle load quality characteristic model A, residual quality characteristic model C and liquid tank mass property Model B, thereby set up the liquid tank mass property Model B 2 when adopting solid ballast.
The present embodiment needs the mass property of liquid in the cabin is simulated with the mode of solid ballast.In this process, keep idle load quality characteristic model A and residual quality characteristic model C constant.Replace liquid in the cabin with some masses, regulate the position of each mass, obtain the liquid tank mass property Model B 2 of liquid in the cabin.When idle load quality characteristic model A, liquid tank mass property Model B 2 and residual quality characteristic model C sum equal the mass property of whole ship model, record the position of each mass in the liquid tank mass property Model B 2 of liquid in the cabin, completed the adjusting of the solid ballast of FLNG ship model; Otherwise the position of each mass in the liquid tank mass property Model B 2 of liquid in the continuation adjusting cabin is until idle load quality characteristic model A, liquid tank mass property Model B 2 and residual quality characteristic model C sum equal the mass property of whole ship model.
Liquid tank mass property Model B 1 and liquid tank mass property Model B 2 are numerically identical, and unique difference between the two is that the former uses liquid ballast, and the latter carries out ballast with solid.
The 6th step, when carrying out the water pool model experiment, the clean ship model is put into water, position and quality according to each mass in residual quality characteristic model C, the corresponding foundary weight of discharging in the clean ship model, when carrying out the liquid ballast adjusting, inject the liquid identical with liquid tank mass property Model B 1 Loaded goods quality in liquid tank; When carrying out the solid ballast adjusting, according to position and the quality of each mass in liquid tank mass property Model B 2, the corresponding foundary weight of discharging in liquid tank.
The present embodiment only needs to measure the mass property of clean ship mould on inertia adjusting stand, the weight of unloaded ship model is generally lighter, the range of existing inertia adjusting stand all can satisfy condition, overcome model quality and the too little defective of size that existing inertia adjustment means is measured, made the water pool model experiment of carrying out very-large offshore structure under conventional scaling factor more easily realize; The accurate mass property of the FLNG ship model during the Adjust and use liquid ballast; Can realize the adjusting to the mass property of dummy ship under the adjusting of the mass property of dummy ship under the solid ballast mode and liquid ballast mode, and the mass property that can guarantee the dummy ship of two kinds of ballast modes under the same loading condition is identical, and the unique difference of FLNG ship model in liquid and two kinds of situations of solid ballast is rocking of degree of freedom liquid level; Improve the accuracy that inertia is regulated, reduced systematic error, simple to operate, and cost is very low.
Claims (8)
1. the test inertia regulating method of a FLNG sloshing model, is characterized in that, comprises the following steps:
The first step, the mass property when utilizing existing inertia adjusting bracket to measure the ship model zero load;
Second step, the idle load quality characteristic model A when setting up the ship model zero load;
The 3rd step, set up the liquid tank mass property Model B 1 when adopting liquid ballast, record the quality of each liquid tank Loaded goods;
The 4th step, set up residual quality characteristic model C, record position and the quality of each mass;
The 5th step, set up the liquid tank mass property Model B 2 when adopting solid ballast, record position and the quality of each mass;
The 6th step, when carrying out the water pool model experiment, the clean ship model is put into water, position and quality according to each mass in residual quality characteristic model C, the corresponding foundary weight of discharging in the clean ship model, when carrying out the liquid ballast adjusting, inject the liquid identical with liquid tank mass property Model B 1 Loaded goods quality in liquid tank; When carrying out the solid ballast adjusting, according to position and the quality of each mass in liquid tank mass property Model B 2, the corresponding foundary weight of discharging in liquid tank.
2. the test inertia regulating method of FLNG sloshing model according to claim 1, it is characterized in that, the mass property described in the first step is weight, center-of-gravity position, radius of turn, rotor inertia, rolling, the pitching of ship model and the natural period parameter of hanging down and swinging.
3. the test inertia regulating method of FLNG sloshing model according to claim 1, is characterized in that, the idle load quality characteristic model A described in second step is to adopt Finite Element Method to set up, and its mass property is exactly the mass property that the first step is measured.
4. the test inertia regulating method of FLNG sloshing model according to claim 1, is characterized in that, the liquid described in the 3rd step is liquefied natural gas, perhaps replaces with sheet material.
5. the test inertia regulating method of FLNG sloshing model according to claim 4, it is characterized in that, free surface and the shape of tank bulkhead around the geometric figure that forms as sheet material of described sheet material liquid in the cabin, thickness take liquid tank inwall length as sheet material, the density of the liquid that loads in the cabin is the density of sheet material.
6. the test inertia regulating method of FLNG sloshing model according to claim 1, is characterized in that, the liquid tank mass property Model B 1 described in the 3rd step is to adopt Finite Element Method to set up, and its mass property is provided by the weight calculation sheet of ship model.
7. the test inertia regulating method of FLNG sloshing model according to claim 1, it is characterized in that, residual quality characteristic model C described in the 4th step, be: keep idle load quality characteristic model A and liquid tank mass property Model B 1 constant, by quantity, specification and the position of quality of regulation piece, make idle load quality characteristic model A, liquid tank mass property Model B 1 and residual quality characteristic model C sum equal mass property total in the weight calculation sheet of ship model.
8. the test inertia regulating method of FLNG sloshing model according to claim 1, it is characterized in that, liquid tank mass property Model B 2 described in the 5th step, be: keep idle load quality characteristic model A and residual quality characteristic model C constant, by adjusting quantity, specification and the position of foundary weight, make total mass property in 2 and the weight calculation sheet that equal ship model of idle load quality characteristic model A, residual quality characteristic model C and liquid tank mass property Model B.
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| CN104085705A (en) * | 2014-06-23 | 2014-10-08 | 中国海洋石油总公司 | FLNG tandem transportation device based on rotary-disc type hose |
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| CN102721509B (en) * | 2012-05-22 | 2014-09-03 | 北京农业信息技术研究中心 | Method for grading adhesive bulk agricultural products on line |
| CN103661805B (en) * | 2013-12-24 | 2016-01-06 | 中国石油大学(华东) | A kind of Multifunctional ship model experimental measurement device |
| CN104764585B (en) * | 2015-03-31 | 2017-03-15 | 中国海洋石油总公司 | A kind of large-scale liquefied petroleum natural gas boat basin test side pushes away functional simulation device |
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