CN108563853A - A method of the assessment natural period of sloshing containing horizontal baffle - Google Patents
A method of the assessment natural period of sloshing containing horizontal baffle Download PDFInfo
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- CN108563853A CN108563853A CN201810285903.7A CN201810285903A CN108563853A CN 108563853 A CN108563853 A CN 108563853A CN 201810285903 A CN201810285903 A CN 201810285903A CN 108563853 A CN108563853 A CN 108563853A
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- horizontal baffle
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Abstract
The present invention relates to a kind of methods of sloshing natural period of the assessment containing horizontal baffle, wherein the described method comprises the following steps：S1, different tank dimensions, different level baffle dimensions and the different level baffle arrangement corresponding sloshing natural period containing horizontal baffle are largely solved using boundary element numerical method；S2, mathematical simulation is carried out to the data that step S1 is obtained, the calculation formula for obtaining the sloshing natural period containing horizontal baffle is：Wherein, ξ=π h/le, le=c × l, c are corrected parameter.
Description
Technical field
The present invention relates to ship domains, more particularly to a kind of side of the assessment natural period of sloshing containing horizontal baffle
Method.
Background technology
Tanker is the Ship Types of rising in recent years, such as oil carrier, LNG carrier and liquid chemicals ship, such
Ship is often arranged multiple large-scale liquid tanks and transports liquid for storing.Compared with conventional ship type, an important feature of tanker
For the mobility of cargo.When riding the sea, because the extraneous factors such as stormy waves stream act on, ship, which will produce, to be swayed, and then leads to liquid
Liquid sways movement, i.e. sloshing phenomenon in cabin.Sloshing can bring significant damage, violent liquid to security of shipping
Cabin, which is rocked, to cause fluid cabin to destroy, or even aggravation oscillation of ship moves and then ship is caused to topple.Assess sloshing danger
A harmful important indicator is the natural period of sloshing, when sloshing natural period and oscillation of ship period are close,
It resonates, sloshing degree is significantly aggravated, and should strongly be avoided in engineering.
In view of the importance of sloshing natural period, it is inherently all that academia proposes a variety of method assessment sloshings
Phase can totally summarize three categories：Theory method, test method(s) and empirical method.Theory method is based on principles of fluid mechanics and derives liquid tank
The expression formula of natural period is rocked, this method is the most accurate and quick, but is only applicable to smooth liquid tank (such as rectangle of regular shape
Liquid tank, cylindrical tank etc.), the liquid tank for complicated shape or the liquid tank with internal component, this method failure.Test method(s) is adopted
With mock-up experiment or business fluid engineering software, the sloshing natural period is determined by in-kind simulation or numerical simulation,
The method can accurately obtain the sloshing natural period and not limited by liquid tank geometry, but actual loading test and number
Value simulation is time-consuming long, of high cost, and generally requires that experiment is repeated several times, therefore engineering adaptability is poor.Empirical method is by a large amount of examinations
Data and engineering practical experience are tested, proposes miscellaneous experiential modification method to assess sloshing natural period, this method side
Just quick, the sloshing natural period can be accurately obtained, special shape of liquid tank is can be used for, is the mainstream of current industrial quarters
Method, but restricted application, a certain empirical method is only effective to certain liquid tank, invalid to other types liquid tank.
Generally mixing uses theory method and empirical method when the engineering circles assessment sloshing natural period at present, that is, is based on rectangle
The Theory Solution of sloshing natural period, and carry out empirical amendment for situations such as change in shape and internal component.Liquid tank shakes
The prototype for swinging natural period calculation formula rocks formula from Smooth Rectangular liquid tank.Smooth Rectangular sloshing schematic diagram is such as
Shown in Fig. 1.According to potential flow theories, the governing equation of rectangle sloshing phenomenon is：
As x=± l/2
As z=-d
As z=0
Wherein Φ is velocity potential, and g is acceleration of gravity.The above Eigenvalue Problems are solved using the separation of variable of standard,
Up to the Smooth Rectangular sloshing natural period generally acknowledged at present：
Using dimensionless mode, obtains dimensionless and rock the natural period and be
Current method universally recognized in the world is the method recommended using world Ji Jia mainstreams classification society.It is situated between separately below
It continues.
(1) method is recommended by British Corporation
British Corporation recommend method using the basic theories solution of rectangle sloshing natural period as prototype, and further
Considering bottom has the situation of vertical member, as shown in Figure 1.This method thinks after increasing bottom vertical member that liquid has
Effect depth is become from former FWherein n is the number (taking 4 in fig. 2) of bottom member.
(2) method is recommended by American Bureau of Shipping
American Bureau of Shipping recommend method using the basic theories solution of rectangle sloshing natural period as prototype, and further
Considering bottom has vertical member and the situation equipped with vertical openings bulkhead (or strong frame), as shown in Figure 3.This method thinks to increase
After having added bottom vertical member and opening bulkhead, the effective depth of liquid is become from former dIts
Middle n is the number (taking 4 in figure 3) of bottom member.After increasing opening bulkhead, the effective width of liquid becomes [1- from former l
(1-α)/4-(1-α)2/4]2× l, wherein α are that (i.e. liquid level is under shed for open area ratio of the opening bulkhead under the level
The following gross area of area/liquid level).
(3) China Classification Society recommends method
The method that China Classification Society is recommended is gone forward side by side equally using the basic theories solution of rectangle sloshing natural period as prototype
One step, which considers bottom, vertical member and the situation equipped with vertical openings bulkhead and strong frame, and upper and American Bureau of Shipping is put at this
It is similar, therefore schematic diagram is equally such as Fig. 3.China Classification Society phase in the processing method of liquid effective depth with American Bureau of Shipping
Together, that is, think that the effective depth of liquid is become from former dWherein n is the number of bottom member
(taking 4 in figure 3).It is different in the processing Shang Liang classification societies of liquid effective width.The method that China Classification Society is recommended thinks, works as increasing
Mouthful bulkhead is increased with after strong frame, liquid effective width becomes (1+n from former lwαw)×(1+ffαf)/(1+nw)/(1+ff) × l,
Wherein：nwFor the bulkhead number that is open；αwFor open area ratio of the opening bulkhead under the level；αfIt is strong frame in the liquid
Open area ratio under the depth of face；ff=nf/(1+nw)；nfFor strong frame number.
In conclusion the method that each classification society is recommended using rectangle sloshing natural period Theory Solution as prototype, considers
Different factors are modified liquid effective depth with effective width, finally bring rectangle sloshing theory solution formula into, in turn
The sloshing natural period is obtained, therefore is application of mixture theory-empirical method.The considerations of distinct methods, factor was not quite similar, and form
Difference, even if handling same factor, distinct methods may also have bigger difference (such as American Bureau of Shipping and China Classification Society
Processing to effective liquid level width).It needs according to actual needs, to sit in the right seat in application process, suitable method is selected to assess
The sloshing natural period.
There is insider to propose to inhibit the scheme of sloshing using horizontal baffle in recent years, as shown in figure 4, and testing
In achieve better effects.Research finds that horizontal baffle can significantly modify the natural period of sloshing, this is to being avoided resonance from sending out
Life is of great significance.Horizontal baffle is free of in the considerations of due to existing method factor, therefore can not assess the liquid containing horizontal baffle
Rock the natural period in cabin.
Invention content
The present invention is intended to provide a kind of method of the assessment natural period of sloshing containing horizontal baffle, to solve existing method
The problem of sloshing natural period containing horizontal baffle can not be assessed.For this purpose, the specific technical solution that the present invention uses is as follows：
A method of sloshing natural period of the assessment containing horizontal baffle, wherein the described method comprises the following steps：
S1, different tank dimensions, different level baffle dimensions and different level are largely solved using boundary element numerical method
The baffle arrangement corresponding sloshing natural period containing horizontal baffle is to get to largely about the sloshing containing horizontal baffle
The data of relationship between natural period and tank dimension, horizontal baffle size and horizontal baffle arrangement, wherein the liquid tank ruler
Very little includes liquid depth d and drop width l, and the horizontal baffle size includes horizontal baffle height h and horizontal baffle width b,
The horizontal baffle arrangement includes horizontal baffle single-sided arrangement and horizontal baffle bilateral arrangement；
S2, mathematical simulation is carried out to the data that step S1 is obtained, obtains the sloshing natural period containing horizontal baffle
Calculation formula is：Wherein, ξ=π h/le, le=c × l, c are corrected parameter, when liquid tank is only unilateral
When arranging horizontal baffle,When liquid tank bilateral arranges horizontal baffle,Wherein, γ=
H/d,
+ 29.39 α of P=12.01-60.51 α -6.738 β2+70.23αβ+3.546β2
+302.9α3-190.5α2β-8.134αβ2-433.5α4+182.7α3β+6.567α2β2,
Q=0.3559+1.403 α -0.5202 β -12.16 α2+5.277αβ+0.1781β2
+37.13α3-10.65α2β-1.124αβ2-32.65α4+6.114α3β+1.483α2β2,
+ 74.45 α of K=7.232-40.76 α -0.1626 β2+8.798αβ+1.276β2,
-45.17α3-1.371α2β+0.7613αβ2
+ 1.121 α of J=0.209+0.791 α -0.03364 β2+1.276αβ+0.02553β2,
+0.25α3-1.787α2β-0.05393αβ2
Wherein, α=b/l, β=d/l.
Further, the data volume in step S1 is 200 × 10 × 2=4000, i.e. 200 different tank dimensions,
10 different horizontal baffle sizes and 2 horizontal baffle arrangements.
The present invention uses above-mentioned technical proposal, has an advantageous effect in that：The method and step of the present invention is simple, as a result may be used
It leans on, those skilled in the art directly can utilize obtained formula to calculate the sloshing natural period containing horizontal baffle, be
Practical application provides theoretical foundation.
Description of the drawings
Fig. 1 is rectangle sloshing schematic diagram；
Fig. 2 is the applicable liquid tank schematic diagram of British Corporation's empirical equation；
Fig. 3 is the applicable liquid tank schematic diagram of the U.S./China Classification Society empirical equation；
Fig. 4 is the liquid tank schematic diagram containing horizontal baffle；
Fig. 5 is the flow chart of the method for the present invention；
Fig. 6 a are the sloshings containing unilateral horizontal baffle obtained using the method for the present invention, other methods and test measurement
The comparison diagram of natural period；
Fig. 6 b are the sloshings of the horizontal baffle containing bilateral obtained using the method for the present invention, other methods and test measurement
The comparison diagram of natural period.
Specific implementation mode
To further illustrate that each embodiment, the present invention are provided with attached drawing.These attached drawings are that the invention discloses one of content
Point, mainly to illustrate embodiment, and the associated description of specification can be coordinated to explain the operation principles of embodiment.Cooperation ginseng
These contents are examined, those of ordinary skill in the art will be understood that other possible embodiments and advantages of the present invention.
In conjunction with the drawings and specific embodiments, the present invention is further described.
After the influence for considering horizontal baffle, formula (1) is not used to the calculating of sloshing natural period, this is because adding
The depth of water-cabin length is changed than d/l after adding partition board.The geometric properties of further research level partition board can be sent out with influence mode
Existing, that horizontal baffle influences is effective length of tank le, that is, consider that the sloshing natural period expression formula after horizontal baffle is answered
For
Wherein leFor effective length of tank, with the parameters such as length of tank l, horizontal baffle length b, horizontal baffle depth h
It is related.
Therefore, technical scheme of the present invention be exactly using existing theoretical method obtain about different length of tank l, level
The data of the sloshing natural period containing horizontal baffle of the parameters such as septum plate length b, horizontal baffle depth h, sum up calculating
The empirical method of sloshing natural period containing horizontal baffle.Below with reference to Fig. 5 to the details of technical scheme of the present invention
It is described.
Fig. 5 is the flow chart of the method for the present invention.Sloshing natural period of the assessment containing horizontal baffle of the present invention
Method may include following steps：
S1, different tank dimensions, different level baffle dimensions and different level are largely solved using boundary element numerical method
The baffle arrangement corresponding sloshing natural period containing horizontal baffle is to get to largely about the sloshing containing horizontal baffle
The data of relationship between natural period and tank dimension, horizontal baffle size and horizontal baffle arrangement.Tank dimension includes liquid
Body depth d and drop width l, horizontal baffle size include horizontal baffle height h and horizontal baffle width b, horizontal baffle arrangement
It is arranged including horizontal baffle single-sided arrangement and horizontal baffle bilateral, as shown in Figure 4.
It is noted that Element BEM numerical value is well known numerical method, in place of no specially treated, therefore no longer chat here
It states.
In a specific embodiment, data volume is 200 × 10 × 2=4000, i.e. 200 different tank dimensions,
10 different horizontal baffle sizes and 2 horizontal baffle arrangements.
S2, mathematical simulation is carried out to the data that step S1 is obtained, obtains the sloshing natural period containing horizontal baffle
Formula is：Wherein, ξ=π h/le, le=c × l, c are corrected parameter, when liquid tank only single-sided arrangement
When horizontal baffle,When liquid tank bilateral arranges horizontal baffle,Wherein, γ=h/d,
+ 29.39 α of P=12.01-60.51 α -6.738 β2+70.23αβ+3.546β2
+302.9α3-190.5α2β-8.134αβ2-433.5α4+182.7α3β+6.567α2β2,
Q=0.3559+1.403 α -0.5202 β -12.16 α2+5.277αβ+0.1781β2
+37.13α3-10.65α2β-1.124αβ2-32.65α4+6.114α3β+1.483α2β2,
+ 74.45 α of K=7.232-40.76 α -0.1626 β2+8.798αβ+1.276β2,
-45.17α3-1.371α2β+0.7613αβ2
+ 1.121 α of J=0.209+0.791 α -0.03364 β2+1.276αβ+0.02553β2,
+0.25α3-1.787α2β-0.05393αβ2
Wherein, α=b/l, β=d/l.Through it was found that leIt is in proportionate relationship, proportionality coefficient c and depth ratio γ=h/ with l
D, the long α=b/l of opposed separators is related with relative depth β=d/l.
Therefore, those skilled in the art can directly be obtained using step S2 formula calculates the liquid tank containing horizontal baffle
Rock the natural period.Specifically, the practical geometric parameter of liquid tank and horizontal baffle is obtained by drawing or actual measurement method, wrapped
Include liquid depth d, drop width l, horizontal baffle height h and horizontal baffle width b；Then it is unilateral according to real standard partition board
Arrangement or bilateral arrangement carry out calculating parameter P and Q or K and J；Then corrected parameter c and effective length l is calculatede；Finally byThe sloshing natural period containing horizontal baffle is calculated.
This method can assess the sloshing natural period containing horizontal baffle, this is that existing other technologies method can not
Accomplish.Fig. 6 gives assesses result (the wherein liquid depth d with the horizontal baffle sloshing natural period using this method
=10m, drop width l=10m, horizontal baffle height h=8m), and with other appraisal procedures (including British Corporation, the U.S.
The recommendation method of classification society and China Classification Society) and test measurement result compared.There it can be seen that this method and experiment
As a result it approaches, and other methods can not consider the influence of horizontal baffle.
Although specifically showing and describing the present invention in conjunction with preferred embodiment, those skilled in the art should be bright
In vain, it is not departing from the spirit and scope of the present invention defined by the appended claims, it in the form and details can be right
The present invention makes a variety of changes, and is protection scope of the present invention.
Claims (2)
1. a method of sloshing natural period of the assessment containing horizontal baffle, which is characterized in that the method includes following
Step：
S1, different tank dimensions, different level baffle dimensions and different level partition board are largely solved using boundary element numerical method
Arrange the corresponding sloshing natural period containing horizontal baffle to get to largely intrinsic about the sloshing containing horizontal baffle
The data of relationship between period and tank dimension, horizontal baffle size and horizontal baffle arrangement, wherein the tank dimension packet
Include liquid depth d and drop width l, the horizontal baffle size includes horizontal baffle height h and horizontal baffle width b, described
Horizontal baffle arrangement includes horizontal baffle single-sided arrangement and horizontal baffle bilateral arrangement；
S2, mathematical simulation is carried out to the data that step S1 is obtained, obtains the calculating of the sloshing natural period containing horizontal baffle
Formula is：Wherein, ξ=π h/le, le=c × l, c are corrected parameter, when liquid tank only single-sided arrangement
When horizontal baffle,When liquid tank bilateral arranges horizontal baffle,Wherein, γ=h/d,
+ 29.39 α of P=12.01-60.51 α -6.738 β2+70.23αβ+3.546β2
+302.9α3-190.5α2β-8.134αβ2-433.5α4+182.7α3β+6.567α2β2,
Q=0.3559+1.403 α -0.5202 β -12.16 α2+5.277αβ+0.1781β2
+37.13α3-10.65α2β-1.124αβ2-32.65α4+6.114α3β+1.483α2β2,
Wherein, α=b/l, β=d/l.
2. the method for sloshing natural period of the assessment containing horizontal baffle as described in claim 1, which is characterized in that step
Data volume in S1 is 200 × 10 × 2=4000, i.e. 200 different tank dimensions, 10 different horizontal baffle sizes
And 2 horizontal baffle arrangements.
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| CN201810285903.7A CN108563853B (en) | 2018-04-03 | 2018-04-03 | Method for evaluating sloshing inherent period of liquid tank with horizontal partition plate |
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| CN201810285903.7A CN108563853B (en) | 2018-04-03 | 2018-04-03 | Method for evaluating sloshing inherent period of liquid tank with horizontal partition plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117272692A (en) * | 2023-11-21 | 2023-12-22 | 中国石油大学(华东) | Method and system for evaluating sloshing adaptability of offshore natural gas treatment process |
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| GB2436370A (en) * | 2006-03-24 | 2007-09-26 | Zeta Dynamics Ltd | Horizontal calming baffle for smoothing fluid flow |
| CN103745063A (en) * | 2014-01-16 | 2014-04-23 | 中国海洋石油总公司 | Liquid tank optimum design method based on load in severe sloshing inside liquid cargo ship |
| CN106547944A (en) * | 2016-09-27 | 2017-03-29 | 大连理工大学 | A kind of dividing plate optimization method for suppressing compressible two phase flow to rock |
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2018
- 2018-04-03 CN CN201810285903.7A patent/CN108563853B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2436370A (en) * | 2006-03-24 | 2007-09-26 | Zeta Dynamics Ltd | Horizontal calming baffle for smoothing fluid flow |
| CN103745063A (en) * | 2014-01-16 | 2014-04-23 | 中国海洋石油总公司 | Liquid tank optimum design method based on load in severe sloshing inside liquid cargo ship |
| CN106547944A (en) * | 2016-09-27 | 2017-03-29 | 大连理工大学 | A kind of dividing plate optimization method for suppressing compressible two phase flow to rock |
Non-Patent Citations (4)
| Title |
|---|
| J.R.CHO等: "Finite element analysis of resonant sloshing response in 2-D baffled tank", 《JOURNAL OF SOUND AND VIBRATION》 * |
| 张东伟等: "FLNG液舱晃荡压力影响因素及安全性评估研究", 《海洋工程》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117272692A (en) * | 2023-11-21 | 2023-12-22 | 中国石油大学(华东) | Method and system for evaluating sloshing adaptability of offshore natural gas treatment process |
| CN117272692B (en) * | 2023-11-21 | 2024-02-13 | 中国石油大学(华东) | Method and system for evaluating sloshing adaptability of offshore natural gas treatment process |
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