CN101905737A - 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 is that a kind of FLNG (large-scale floating liquefied natural gas carrier) liquid tank rocks the test inertia regulating method of 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 the marginal field, ocean cost-effectively, the notion of large-scale floating liquefied natural gas carrier (hereinafter to be referred as the FLNG ship) has been proposed in the world.The FLNG permanent mooring that has bulkiness is in the operation marine site, and liquid loads situation in marine environment condition that experience is complicated and the various cabin.Abominable marine environment condition will cause the strenuous exercise of FLNG, thereby cause rocking of liquid in the cabin.Liquid rocks the motion aggravation that also will cause hull and the destruction of liquid tank inwall in the cabin.Therefore, the situation that influences that liquid rocks the ship motion response in the cabin becomes one of the key factor that must consider in the FLNG hull design.
By model test, can comparatively comprehensively observe rocking phenomenon and, obtaining comparatively failure-free test results of liquid in the cabin to the influence of FLNG ship motion.Test results can be used to the design accuracy of verification theory and numerical model.The precondition that the pond model experiment is successfully carried out is exactly the accurate adjusting of FLNG model inertia.The method of traditional measurement inertia is to utilize three string pendulums to measure, and this method systematic error is too big, 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, the related inertia simulation system of this technology 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 the moment of positive and negative both direction to the inertia dish, 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 therefore brake system that 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 mainly shows: (1) because FLNG hull and displacement are 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 within the load-bearing scope of existing inertia adjusting stand, yet the pond model experiment result that this kind mode obtains have than mistake with the model weight control.The accuracy that inertia was regulated when (2) existing inertia regulative mode can guarantee solid ballast, the accuracy that inertia is regulated when still being difficult to guarantee liquid ballast.And the accuracy that inertia is regulated is the precondition that the pond model experiment is successfully carried out, and inertia is regulated inaccurate and model experiment that carry out, and its result will not have reference value.Investigate liquid tank and rock the influence that ship motion is responded, must be at FLNG with adopting liquid ballast and two kinds of situations of solid ballast to experimentize under a kind of loading situation respectively.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 finish the adjusting of inertia, labor intensive resource.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency of prior art, provide a kind of FLNG liquid tank to rock the test inertia regulating method of model.The present invention only needs to measure the mass property of clean ship mould on inertia adjusting stand, can realize 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.
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 to adopt Finite Element Method to set up, 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, write down the quality of each liquid tank Loaded goods.
Described liquid is liquefied natural gas, perhaps replaces with sheet material.
Described sheet material is the shape of sheet material with the free surface and the tank bulkhead of liquid in the cabin around the geometric figure that forms, and is the thickness of sheet material with liquid tank inwall length, is the density of sheet material with cargo-carring density of liquid in the cabin.
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, write down the 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 total mass property 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, write down the 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 idle load quality characteristic model A, residual quality characteristic model C and the liquid tank mass property Model B weight calculation sheet 2 and that equal ship model.
The 6th step, when carrying out the pond model experiment, the clean ship model is put into water, position and quality according to each mass in the residual quality characteristic model C, the corresponding foundary weight of discharging in the clean ship model, when carrying out the liquid ballast adjusting, in liquid tank, inject and the identical liquid of liquid tank mass property Model B 1 Loaded goods quality; When carrying out the solid ballast adjusting, according to the position and the quality of each mass in the 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 easier realization of pond model experiment of carrying out the ultra-large type ocean structure under conventional scaling factor.The defective of dummy ship inertia made the FLNG liquid tank rock the pond model experiment and is carried out smoothly when (2) the present invention had overcome existing inertia adjustment means and can't accurately measure liquid ballast, had 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: 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.
Embodiment
Present embodiment is before test, elder generation is according to yardstick, the physical size of FLNG, the particular case of operating condition of test and the economy preference pattern scaling factor of test in 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 may further comprise the 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 ship model inertia adjusting stand 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.
Present embodiment is only considered the mass property of cargo-carring liquid in the liquid tank in setting up liquid tank model process, the mass property of liquid tank itself then puts under in the residual quality characteristic model to be considered.For the modeling of cargo-carring liquid in the cabin, usefulness equal densities that can not be simple is considered with identical cargo-carring liquid, because can't obtain the mass property of liquid like this.In this process, cargo-carring liquid replaces with sheet material in the cabin.Specific practice is: free surface and tank bulkhead with liquid in the cabin are the shape of sheet material around the geometric figure that forms, and are the thickness of sheet material with liquid tank inwall length, are the density of sheet material with cargo-carring density of liquid in the cabin.The model of liquid can conveniently obtain the solid timer-operated mass property of liquid in the cabin in the cabin of building up with the method.
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 total mass property in the weight calculation sheet of ship model, thereby set up residual quality characteristic model C.
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 in the present embodiment, and need add a residual mass characteristic at this can be consistent with the expected value of model.In modeling process, with the foundary weight in the mass substitution model experiment residual mass characteristic is regulated, make that liquid quality characteristic and residual mass characteristic sum and whole ship model mass property are consistent in clean ship model quality characteristic, the cabin.After adjustment finishes, note the particular location of each mass, in the model experiment of pond, 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 idle load quality characteristic model A, residual quality characteristic model C and the liquid tank mass property Model B weight calculation sheet 2 and that equal ship model, thereby set up the liquid tank mass property Model B 2 when adopting solid ballast.
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, note the position of each mass in the liquid tank mass property Model B 2 of liquid in the cabin, then finished 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, the mass property that equals to put in order ship model until idle load quality characteristic model A, liquid tank mass property Model B 2 and residual quality characteristic model C sum.
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 pond model experiment, the clean ship model is put into water, position and quality according to each mass in the residual quality characteristic model C, the corresponding foundary weight of discharging in the clean ship model, when carrying out the liquid ballast adjusting, in liquid tank, inject and the identical liquid of liquid tank mass property Model B 1 Loaded goods quality; When carrying out the solid ballast adjusting, according to the position and the quality of each mass in the liquid tank mass property Model B 2, the corresponding foundary weight of discharging in liquid tank.
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 easier realization of pond model experiment of under conventional scaling factor, carrying out the ultra-large type ocean structure; Can accurately regulate the mass property of the FLNG ship model when utilizing liquid ballast; Can realize 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 with a kind of loading condition is identical, and the unique difference of FLNG ship model under 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. a FLNG liquid tank rocks the test inertia regulating method of model, it is characterized in that, may further comprise the 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, write down the quality of each liquid tank Loaded goods;
The 4th step, set up residual quality characteristic model C, write down the position and the quality of each mass;
The 5th step, set up the liquid tank mass property Model B 2 when adopting solid ballast, write down the position and the quality of each mass;
The 6th step, when carrying out the pond model experiment, the clean ship model is put into water, position and quality according to each mass in the residual quality characteristic model C, the corresponding foundary weight of discharging in the clean ship model, when carrying out the liquid ballast adjusting, in liquid tank, inject and the identical liquid of liquid tank mass property Model B 1 Loaded goods quality; When carrying out the solid ballast adjusting, according to the position and the quality of each mass in the liquid tank mass property Model B 2, the corresponding foundary weight of discharging in liquid tank.
2. FLNG liquid tank according to claim 1 rocks the test inertia regulating method of model, it is characterized in that, 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.
3. FLNG liquid tank according to claim 1 rocks the test inertia regulating method of model, it 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. FLNG liquid tank according to claim 1 rocks the test inertia regulating method of model, it is characterized in that, the liquid described in the 3rd step is liquefied natural gas, perhaps replaces with sheet material.
5. FLNG liquid tank according to claim 4 rocks the test inertia regulating method of model, it is characterized in that, described sheet material is the shape of sheet material with the free surface and the tank bulkhead of liquid in the cabin around the geometric figure that forms, with liquid tank inwall length is the thickness of sheet material, is the density of sheet material with cargo-carring density of liquid in the cabin.
6. FLNG liquid tank according to claim 1 rocks the test inertia regulating method of model, it 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. FLNG liquid tank according to claim 1 rocks the test inertia regulating method of model, 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 total mass property in the weight calculation sheet of ship model.
8. FLNG liquid tank according to claim 1 rocks the test inertia regulating method of model, 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 idle load quality characteristic model A, residual quality characteristic model C and the liquid tank mass property Model B weight calculation sheet 2 and that equal ship model.
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| CN2010102450423A CN101905737B (en) | 2010-08-05 | 2010-08-05 | Test inertia regulating method of FLNG liquid tank sloshing model |
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| CN102721509A (en) * | 2012-05-22 | 2012-10-10 | 北京农业信息技术研究中心 | Method for grading adhesive bulk agricultural products on line |
| CN103661805A (en) * | 2013-12-24 | 2014-03-26 | 中国石油大学(华东) | Multifunctional ship model experimental measurement device |
| CN104764585A (en) * | 2015-03-31 | 2015-07-08 | 中国海洋石油总公司 | Large liquefied petroleum and natural gas boat pond test horizontal thrusting function simulation device |
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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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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103661805A (en) * | 2013-12-24 | 2014-03-26 | 中国石油大学(华东) | Multifunctional ship model experimental measurement device |
| 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 |
| CN104764585A (en) * | 2015-03-31 | 2015-07-08 | 中国海洋石油总公司 | Large liquefied petroleum and natural gas boat pond test horizontal thrusting function simulation 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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