CN109572930A - A kind of evaluation method of semisubmersible platform stream loading - Google Patents
A kind of evaluation method of semisubmersible platform stream loading Download PDFInfo
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Abstract
The disclosure discloses a kind of evaluation method of semisubmersible platform stream loading, this method comprises: determining direction of flow and incoming flow quantity；For each direction of flow, the floating drum of the semisubmersible platform, the resistance coefficient of stull and column, effective length and the height perpendicular to water flow are calculated, wherein effective length is related to masking length, non-obstructing length；The stream loading coefficient of the floating drum, the stull and the column is calculated according to the resistance coefficient of the calculated floating drum, the stull and the column, effective length and perpendicular to the height of water flow for each direction of flow；Floating drum described in accumulation calculating, the stull and the column obtain the stream loading coefficient of the semisubmersible platform in the stream loading coefficient of each direction of flow.The evaluation method can save time and expense and improve computational accuracy.
Description
Technical field
This disclosure relates to which field, in particular to a kind of evaluation method of semisubmersible platform stream loading are assembled in ocean.
Background technique
In semisubmersible platform design process, stream loading is the important input load of dynamic positioning and anchoring positioning analysis.
The general method for obtaining stream loading has experience formula method, parent ship Analogy and model test method etc..The empirical equation
It is simple, convenient that method calculates, but calculated result is bigger than normal compared with model test, over-evaluates platform stream loading.The analogy of parent ship class
Method has the characteristics that computational efficiency is fast, with high accuracy, but on condition that must have suitable parent ship model-test data.Model examination
The computational accuracy of proved recipe method is high, but on condition that needing to establish suitable semisubmersible platform model, the foundation of model needs a large amount of
Time and expense, business efficiency are poor.
Summary of the invention
In order to solve the calculating of semisubmersible platform stream loading present in the relevant technologies, there are computational accuracies and time, expense to deposit
The contradiction the problem of, time and expense can be saved present disclose provides one kind and improves the semisubmersible platform of computational accuracy
The evaluation method of stream loading.
The disclosure provides a kind of evaluation method of semisubmersible platform stream loading, comprising:
Determine direction of flow and incoming flow quantity；
For each direction of flow, the floating drum of the semisubmersible platform, the resistance coefficient of stull and column, effectively length are calculated
Degree and height perpendicular to water flow, wherein effective length is related with length, non-obstructing length is covered；
For each direction of flow, according to the resistance coefficient of the calculated floating drum, the stull and the column, have
Length and the height perpendicular to water flow are imitated, the stream loading coefficient of the floating drum, the stull and the column is calculated；
The floating drum, the stull and the column add up in the stream loading coefficient of each direction of flow, obtains described half
The stream loading coefficient of submersible platform.
The technical scheme provided by this disclosed embodiment can include the following benefits:
The disclosure provides a kind of evaluation method of semisubmersible platform stream loading, this method comprises:
Determine direction of flow and incoming flow quantity；For each direction of flow, floating drum, the stull of the semisubmersible platform are calculated
With the resistance coefficient of column, effective length and perpendicular to the height of water flow, wherein effective length and masking length, non-obstructing length
Degree is related；For each direction of flow, according to the resistance coefficient of the calculated floating drum, the stull and the column, have
Length and the height perpendicular to water flow are imitated, the stream loading coefficient of the floating drum, the stull and the column is calculated；Cumulative meter
The floating drum, the stull and the column are calculated in the stream loading coefficient of each direction of flow, obtains the semisubmersible platform
Stream loading coefficient.For model test method, disclosed method does not need to establish parent form ship model, and calculate more just
It is prompt, efficient and at low cost.And compared with empirical formula method, the result that disclosed method is calculated is more quasi-
Really.Therefore, the stream loading evaluation method that the disclosure uses can save time and expense and improve computational accuracy.
It should be understood that the above general description and the following detailed description are merely exemplary, this can not be limited
It is open.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows and meets implementation of the invention
Example, and in specification together principle for explaining the present invention.
Fig. 1 is the structural schematic diagram of the semisubmersible platform of the disclosure.
Fig. 2 is the flow diagram of disclosure semisubmersible platform stream loading evaluation method.
Fig. 3 is the schematic diagram that semisubmersible platform is partially obscured on the direction incoming flow i.
Fig. 4 is to obtain stream loading calculated result curve graph using different calculation methods in each direction of flow.
Specific embodiment
Principle and structure in order to further illustrate the present invention carry out the preferred embodiment of the present invention now in conjunction with attached drawing detailed
It describes in detail bright.
The disclosure provides a kind of evaluation method of semisubmersible platform stream loading, as shown in connection with fig. 1, the semisubmersible platform 10 packet
Include floating drum 11, column 12 and stull 13.Column 12 is arranged on floating drum 11, and stull 13 is connected between two columns 12.Column 12
Top be provided with platform (not shown).In Fig. 1, which includes two floating drums, four columns and four cross
Support 13, but it is not limited to this, which can be other types, is with semisubmersible platform shown in Fig. 1 herein
Example, illustrates the disclosure to the evaluation method of semi-submersible type platform flow load.
Specifically, as shown in connection with fig. 2, the evaluation method of the semisubmersible platform stream loading, includes the following steps:
Step S1 determines direction of flow and incoming flow quantity.
In the present embodiment, centered on the semisubmersible platform 10,0-360 degree determines an incoming flow and its side every 10 degree
To.But it is not limited to this, and the quantity of incoming flow and direction can be changed according to the actual situation.
Step S2 calculates the floating drum of semisubmersible platform, the resistance coefficient of stull and column, has for each direction of flow
Imitate length and the height perpendicular to water flow, wherein effective length is related to masking length, non-obstructing length.
After determining each direction of flow, in each direction of flow, calculates the resistance coefficient of each component of semisubmersible platform, has
Imitate length and the height perpendicular to water flow.
In the present embodiment, semisubmersible platform mainly includes 13 3 floating drum 11, column 12 and stull components, here,
Mainly calculate the stream loading coefficient of these three components.
Mainly illustrate the resistance coefficients of 13 these three components of floating drum 11, column 12 and stull, effective length and vertical below
In the height calculation method of water flow.
Resistance coefficient mainly determines its effect according to the section feature of component and water flow.Carrying out resistance coefficient
Before calculating, first simplify each component.In the present embodiment, floating drum 11 is reduced to the slender rod piece of the rectangular section with chamfering,
Column 12 is reduced to the slender rod piece of the rectangular section with chamfering, and it is circular slender rod piece that stull 13, which is reduced to section,.
For floating drum 11, resistance coefficient includes the cross section resistance coefficient C perpendicular to 11 length direction of floating drumD1_1The edge and
The length resistance coefficient C of floating drum length directionD1_2.The cross section resistance coefficient C of floating drumD1_1According to cross-sectional width and cross section
The ratio and cross section chamfer radius and the ratio of cross-sectional height of height determine；The length resistance coefficient C of the floating drumD1_2It takes
The 2% of floating drum cross section resistance coefficient.For example, floating drum is reduced to a length of 106.45 meters, cross section is 15.6 meters wide, cross section is high
9.1 meters, the slender rod piece that radius of corner is 1.3 meters.In the present embodiment, using Norske Veritas about environmental condition and environment
Load specification DNVGL-RP-C205 calculates the calculation method of resistance coefficient.The cross-sectional width of the floating drum and height
Ratio is 15.6 meters/9.1 meters=1.714, referring to the annex E-1 in specification DNVGL-RP-C205, as shown in table 1 below, ratio
The 1.714 L/D value in table 1 is between 1.0 and 2.0.The cross section chamfer radius of the floating drum and the ratio of cross-sectional height
It is 1.3 meters/9.1 meters=0.143, R/D value is when L/D value is 1.0 in table 1, and between table 1 between 0.021 and 0.167
R/D value is between 0.042 and 0.167 when middle L/D value is 2.0.For L/D value be 1.0 and L/D value is 2.0 both of these case, point
It is other to R/D value be 0.021,0.167 and R/D value be 0.042,0.167 progress linear interpolation calculating.When L/D value is 1.0, meter
Obtained cross section resistance coefficient CD1_1It is 1.3329, when L/D value is 2.0, it is 0.838 that resistance coefficient, which is calculated, then
It is the 1.0 and 2.0 cross section resistance coefficient C for carrying out linear interpolation calculating acquisition floating drum again with L/D valueD1_1It is 0.977.Along floating
The length resistance coefficient C of cylinder length directionD1_2Take section resistance coefficient CD1_12%.
1 cross section of table is the resistance coefficient with chamfering rectangle referring to table
For column 12, resistance coefficient includes cross section lateral resistance coefficient CD2_1With cross section longitudinal resistance coefficient
CD2_2.The cross section lateral resistance coefficient C of columnD2_1According to the ratio of cross section lateral length and cross-sectional width and transversal
Surface chamfer radius and the ratio of cross-sectional width determine.For example, column be reduced to cross section lateral length be 13.65 meters, it is transversal
The slender rod piece that face width is 13.65 meters, rounding radii is 1.3 meters, strut length are 8.65 meters.As shown in table 1, column
The ratio of cross section lateral length and width is 13.65 meters/13.65 meters=1.0, cross section chamfer radius and cross-sectional width
Ratio is 1.3 meters/13.65 meters=0.095, the ratio 0.095 when L/D value is 1.0 in table 1 R/D value be 0.021 He
Between 0.167.It is calculated by linear interpolation, that is, passes through formula CD2_1- 2.0/ (1.2-2.0)=(0.095-0.021)/
(0.167-0.021), available column cross-section lateral resistance coefficient CD2_1It is 1.593.Similarly, the cross section of column 12 is vertical
To resistance coefficient CD2_2According to the ratio and section chamfer radius of the cross section longitudinal length of column and cross-sectional width and cross
The ratio of section lateral length determines.
For stull 13, resistance coefficient includes the cross section resistance coefficient C perpendicular to 13 length direction of stullD3_1The edge and
The length resistance coefficient C of 13 length direction of stullD3_2.The cross section resistance coefficient C of stullD3_1With the width and length of stull 13
Ratio it is related.For example, stull is reduced to the circular slender rod piece that cross section is 2.4 meters of diameter.The cross-sectional width of stull 13
Ratio with length is 2.4 meters/2.4 meters=1.0.In the present embodiment, using Norske Veritas about environmental condition and environment
Load specification DNVGL-RP-C205 is calculated about the calculation method of the resistance coefficient of elliptic cross-section.Referring to specification
About the resistance coefficient table of elliptic cross-section in DNVGL-RP-C205 annex E-1, as shown in table 2, the cross section resistance of stull
Coefficient CD3_1=1.0.Along the length resistance coefficient C of stull length directionD3_2Take section resistance coefficient CD3_12%.
2 cross section of table is the resistance coefficient of ellipse referring to table
The masking length of the effective length of each component of calculating semisubmersible platform 10 below, effective length and each component,
Non-obstructing length is related.
Specifically, as shown in connection with fig. 3, the region of hatching is the region covered by incoming flow i, the region of undrawn shadow line
For non-shielded area.
The masking length of floating drum 11 is L11, L11=La*κ1, wherein LaIt can directly be measured and to be obtained out by measuring tool
Measurement masking length, κ1For sheltering coefficient.Sheltering coefficient κ1Calculating can be negative about environmental condition and environment according to Norske Veritas
It is carried out in lotus specification DNVGL-RP-C205 about the calculation method of wind load sheltering coefficient.That is to say, the sheltering coefficient of floating drum 11
According to the ratio cc of spacing and height between floating drum 111And the air force solidity ratio β of floating drum 111It determines.Specifically, reference
Relation table in specification DNVGL-RP-C205 about sheltering coefficient κ and spacing ratio α, air force solidity ratio β, such as the following table 3.Example
Such as, the spacing between two floating drums 11 is 53.3 meters, and the height of floating drum 11 is 9.1 meters, then the ratio cc of spacing and height1=53.3/
9.1=5.857 the ratio cc1Between 5.0 and 6.0 of the α value in table 3.Air force solidity ratio β1=Ф a, wherein Ф
For solidity ratio, a is constant.Floating drum 11 is plane institution movement, therefore, a 1.2.About solid in Ф reference specification DNVGL-RP-C205
Property ratio regulation, Ф value be 1.0, therefore, β1=Ф a=1*1.2=1.2, the value are more than 0.8 of β value in table 3, therefore, β1
Last in table 3 is taken to arrange.Sheltering coefficient κ1Linear interpolation calculating is carried out according to table 3, that is, passes through formula (κ1-0.6)/(0.66-
0.6)=(5.857-5.0)/(6.0-5.0) is calculated, and obtains κ1=0.651.
The relation table of 3 sheltering coefficient of table and spacing ratio α, air force solidity ratio β
The non-obstructing length L of floating drum 1121Not shielded floating drum length can be directly measured by measuring tool to obtain.Floating drum
Effective length l1=(L11+L21)*γ1, wherein γ1For the finite length reduction coefficient of floating drum, γ1It can be according to the structure according to floating drum 11
Part section equivalent diameter and component length carry out what finite length coefficient Reduction calculation obtained.Specifically, finite length reduction system
Number can be used Norske Veritas about in environmental condition and carrying capacity of environment specification DNVGL-RP-C205 table 6-2 about slender rod piece
Finite length reduction coefficient calculation method is estimated, wherein diameter is obtained using the method for equivalent cross-sectional area, and length takes reality
2 times of length, in the present embodiment, the finite length reduction coefficient of floating drum are 0.867.In addition, γ1Also can be used other models into
Row simulation.
The masking length, non-obstructing length and effective length of column 12 are calculated in the way of calculating floating drum 11.Column
Masking length L12=Lb*κ2, wherein LbLength, κ are covered in measurement directly to be measured with measuring tool2For masking system
Number.The sheltering coefficient κ of column2According to the ratio cc of spacing and height between two adjacent upright2And the air force of column is solid
Property ratio β2It determines.The non-obstructing length of column is L22, the non-obstructing length L22Not shielded stand can be directly measured by measuring tool
Column length obtains.The effective length l of column2=(L12+L22)*γ2, wherein γ2For the finite length reduction coefficient of the column.
γ2According to the sectional dimension of members and component length of column 12, carry out what finite length coefficient Reduction calculation obtained.Specifically,
Finite length reduction coefficient γ2Norske Veritas can be used about environmental condition and carrying capacity of environment specification DNVGL-RP-C205 table
It is estimated in 6-2 about slender rod piece finite length reduction coefficient calculation method.In the present embodiment, the finite length of column
Reduction coefficient is 0.800.In addition, γ2Other models also can be used to be simulated.
The masking length, non-obstructing length and effective length of stull 13 are calculated in the way of calculating floating drum.Stull 13
Masking length L13=Lc*κ3, wherein LcLength, κ are covered in measurement to be obtained with measuring tool measurement3For sheltering coefficient.It is horizontal
The sheltering coefficient of support 13 states the ratio cc of spacing and its height between stull 13 according to adjacent two3And the air of stull 13 is dynamic
Power solidity ratio β3It determines.The non-obstructing length L of stull 1323Not shielded stull length can be directly measured by measuring tool to obtain
It arrives.The effective length l of stull 133=(L13+L23)*γ3, wherein γ3For the finite length reduction coefficient of stull.γ3According to cross
The member section equivalent diameter and component length of support 13 carry out what finite length coefficient Reduction calculation obtained.Specifically, there is limit for length
Spend reduction coefficient γ3Norske Veritas can be used about closing in environmental condition and carrying capacity of environment specification DNVGL-RP-C205 table 6-2
It is estimated in slender rod piece finite length reduction coefficient calculation method, wherein diameter is obtained using the method for equivalent cross-sectional area,
Length takes 2 times of physical length, and in the present embodiment, the finite length reduction coefficient of stull is 1.0.In addition, γ3It also can be used
Its model is simulated.
Floating drum 11, column 12 and the height H perpendicular to water flow of stull 13 can be obtained by measuring tool measurement.
Floating drum 11 in i-th of direction of flow, column 12 and stull 13 can be calculated through the above steps as a result,
The height of resistance coefficient, effective length and vertical water flow.
In the same way, calculate floating drum 11 in other 35 directions of flow, column 12 and stull 13 resistance coefficient,
The height of effective length and vertical water flow.
Step S3, for each direction of flow, according to the resistance coefficient of calculated floating drum, stull and column, effectively length
Degree and perpendicular to water flow height, calculate the stream loading coefficient of floating drum, stull and the column in the direction of flow.
Each incoming flow is the effect on active force and second direction on first direction to the Force decomposition of semisubmersible platform
Power, it is corresponding, for each incoming flow, calculate semisubmersible platform stream loading coefficient in a first direction and in a second direction
Stream loading coefficient.Wherein, first direction and second direction are perpendicular.As shown in Fig. 2, the first direction can be X-direction, the X
Axis direction is the length direction along semisubmersible platform, which can be Y direction, which is along semisubmersible platform
Width direction.
In i-th of direction of flow, floating drum 11 is η along the stream loading coefficient of first directioni1_1=1/2* ρ * li1*Hi1*
CDi1_1, in a second direction on stream loading coefficient be ηi1_2=1/2* ρ * li1*Hi1*CDi1_2, wherein ρ is jet density, li1For
Effective length in i-th of the direction of flow of floating drum 11, Hi1For the height in i-th of the direction of flow of floating drum 11 perpendicular to water flow,
CDi1_1For the cross section resistance coefficient in i-th of direction of flow of floating drum, CDi1_2For the length resistance in i-th of direction of flow of floating drum
Force coefficient.The effective length l of floating drum 11i1, perpendicular to the height H of water flowi1, cross section resistance coefficient CDi1_1With length resistance system
Number CDi1_2It can be obtained by the calculation of step S2.
In i-th of direction of flow, column 12 is η along the stream loading coefficient of first directioni2_1=1/2* ρ * li2*Hi2*
CDi2_1, in a second direction on stream loading coefficient be ηi2_2=1/2* ρ * li2*Hi2*CDi2_2, wherein ρ is jet density, li2For
Effective length of the column 12 in i-th of direction of flow, Hi2For column 12 perpendicular to the height of water flow in i-th of direction of flow
Degree, CDi2_1For the cross section lateral resistance coefficient in i-th of direction of flow of column, CDi2_2For in i-th of direction of flow of column
Cross section longitudinal resistance coefficient.Similar, the effective length l of column 12i2, perpendicular to the height H of water flowi2, cross section laterally hinder
Force coefficient CDi2_1With cross section longitudinal resistance coefficient CDi2_2It can be obtained by step S2 calculation.
In i-th of direction of flow, since stull 13 is different from floating drum 11, the geometry installation position of column 12, stull 13
Stream loading coefficient along first direction is ηi3_1=1/2* ρ * li3*Hi3*CDi3_2, in a second direction on stream loading coefficient be
ηi3_2=1/2* ρ * li3*Hi3*CDi3_1, wherein ρ is jet density, li3The effective length for being stull 13 in i-th of direction of flow
Degree, Hi3For stull perpendicular to the height of water flow, C in i-th of direction of flowDi3_1For cross of the stull in i-th of direction of flow
Section resistance coefficient, CDi3_2The length resistance coefficient for being stull in i-th of direction of flow.Similar, effective length of stull 13
Spend li3, perpendicular to the height H of water flowi3, cross section resistance coefficient CDi3_1With length resistance coefficient CDi3_2It can pass through step S2's
Calculation obtains.
Step S4, add up floating drum, stull and column obtain semisubmersible platform in the stream loading coefficient of each direction of flow
Stream loading coefficient.
For example, if the quantity of incoming flow be it is N number of, i indicates i-th of incoming flow, the then stream of the semisubmersible platform in a first direction
Loading coefficientStream loading coefficient in a second directionIn the present embodiment, N=36, i from 1 to 36.In 36 directions of flow of superposition calculation
The stream loading coefficient of semisubmersible platform can be obtained in the stream loading coefficient of each component.
The stream loading coefficient in each direction of flow being calculated according to the above method approaches very much passes through model test
The stream loading coefficient of acquisition.As shown in figure 4, Cx curve be shown that disclosure calculation method obtains in different directions of flow
The loading coefficient of semisubmersible platform in the X-axis direction, Cy curve be shown that disclosure calculation method obtains in different incoming flows
The loading coefficient of semisubmersible platform in the Y-axis direction on direction；Cx-API curve and Cy-API curve are to calculate public affairs using experience
The X-direction and Y-direction stream loading coefficient that formula obtains；Cx-exp curve and Cy-exp curve are the X-axis obtained by model test
The stream loading coefficient in direction and Y direction.As can be seen from Figure 4 pass through the X-direction of the disclosure being calculated and Y-axis side
To stream loading coefficient almost coincide with the data obtained by model test method.Therefore, compared to model test method
For, disclosed method does not need to establish platform model, calculates more convenient, efficient and at low cost.And it is calculated with experience
Formula method is compared, and the result that disclosed method is calculated is more accurate.
The above is only preferable possible embodiments of the invention, not limit the scope of the invention, all with the present invention
The variation of equivalent structure made by specification and accompanying drawing content, is included within the scope of protection of the present invention.
Claims (10)
1. a kind of evaluation method of semisubmersible platform stream loading characterized by comprising
Determine direction of flow and incoming flow quantity；
For each direction of flow, calculate the floating drum of the semisubmersible platform, the resistance coefficient of stull and column, effective length and
Perpendicular to the height of water flow, wherein effective length is related to masking length, non-obstructing length；
For each direction of flow, according to the resistance coefficient of the calculated floating drum, the stull and the column, effectively length
Degree and height perpendicular to water flow, calculate stream in the direction of flow of the floating drum, the stull and the column and carry
Lotus coefficient；
The floating drum, the stull and the column add up in the stream loading coefficient of each direction of flow, obtains the semi-submersible type
The stream loading coefficient of platform.
2. the evaluation method of semisubmersible platform stream loading according to claim 1, which is characterized in that the simplified floating drum,
The floating drum is reduced to the slender rod piece with chamfering rectangular section by the stull and the column, and the column is reduced to band
The slender rod piece of chamfering rectangular section, the stull are reduced to the slender rod piece of circular cross-section.
3. the evaluation method of semisubmersible platform stream loading according to claim 2, which is characterized in that
The resistance coefficient of the floating drum includes the cross section resistance coefficient C perpendicular to the floating drum length directionD1_1It is floated with along described
The length resistance coefficient C of cylinder length directionD1_2；
The resistance coefficient of the column includes cross section lateral resistance coefficient CD2_1With cross section longitudinal resistance coefficient CD2_2；
The resistance coefficient of the stull includes the cross section resistance coefficient C perpendicular to the stull length directionD3_1With along the cross
Support the length resistance coefficient C of length directionD3_2。
4. the evaluation method of semisubmersible platform stream loading according to claim 3, which is characterized in that the masking of the floating drum
Length L11=La*κ1, wherein LaLength, κ are covered in measurement directly to be measured with measuring tool1For sheltering coefficient；
The masking length L of the column12=Lb*κ2, wherein LbLength is covered in measurement directly to be measured with measuring tool,
κ2For sheltering coefficient；
The masking length L of the stull13=Lc*κ3, wherein LcLength is covered in measurement directly to be measured with measuring tool,
κ3For sheltering coefficient.
5. the evaluation method of semisubmersible platform stream loading according to claim 4, which is characterized in that the floating drum, described
Column and the non-obstructing length of the stull are directly measured by measuring tool to be obtained, respectively L21、L22、L23, according to described floating
The masking length and non-obstructing length computation effective length of cylinder, the column and the stull:
The effective length l of the floating drum1=(L11+L21)*γ1, wherein γ1For the finite length reduction coefficient of the floating drum, γ1
According to the member section equivalent diameter and component length of the floating drum, carry out what finite length coefficient Reduction calculation obtained；
The effective length l of the column2=(L12+L22)*γ2, wherein γ2For the finite length reduction coefficient of the column, γ2
According to the sectional dimension of members and component length of the column, carry out what finite length coefficient Reduction calculation obtained；
The effective length l of the stull3=(L13+L23)*γ3, wherein γ3For the finite length reduction coefficient of the stull, γ3
According to the member section equivalent diameter and component length of the floating drum, carry out what finite length coefficient Reduction calculation obtained.
6. the evaluation method of semisubmersible platform stream loading according to claim 5, which is characterized in that
In i-th of direction of flow, the floating drum is η along the stream loading coefficient of first directioni1_1=1/2* ρ * li1*Hi1*CDi1_1,
Stream loading coefficient in a second direction is ηi1_2=1/2* ρ * li1*Hi1*CDi1_2, wherein ρ is jet density, li1It is described floating
Effective length in i-th of direction of flow of cylinder, Hi1For the height in i-th of direction of flow of the floating drum perpendicular to water flow, CDi1_1
For the cross section resistance coefficient in i-th of direction of flow of the floating drum, CDi1_2For the length in i-th of direction of flow of the floating drum
Resistance coefficient；
In i-th of direction of flow, the column is η along the stream loading coefficient of first directioni2_1=1/2* ρ * li2*Hi2*CDi2_1,
Stream loading coefficient in a second direction is ηi2_2=1/2* ρ * li2*Hi2*CDi2_2, wherein ρ is jet density, li2It is described vertical
Effective length of the column in i-th of direction of flow, Hi2For the column perpendicular to the height of water flow in i-th of direction of flow,
CDi2_1For the cross section lateral resistance coefficient in i-th of direction of flow of the column, CDi2_2For i-th of incoming flow side of the column
Upward cross section longitudinal resistance coefficient；
In i-th of direction of flow, the stull is η along the stream loading coefficient of first directioni3_1=1/2* ρ * li3*Hi3*CDi3_2,
Stream loading coefficient in a second direction is ηi3_2=1/2* ρ * li3*Hi3*CDi3_1, wherein ρ is jet density, li3For the cross
Support the effective length in i-th of direction of flow, Hi3For the stull perpendicular to the height of water flow in i-th of direction of flow,
CDi3_1The cross section resistance coefficient for being the stull in i-th of direction of flow, CDi3_2It is the stull i-th of incoming flow side
Upward length resistance coefficient；
The first direction is vertical with the second direction.
7. the evaluation method of semisubmersible platform stream loading according to claim 6, which is characterized in that the quantity of the incoming flow
To be N number of, i indicates i-th of incoming flow；
The stream loading coefficient of the semisubmersible platform in a first directionIn second party
Upward stream loading coefficient
8. the evaluation method of semisubmersible platform stream loading according to claim 7, which is characterized in that the N is 36, with institute
Centered on stating semisubmersible platform, 0-360 degree determines an incoming flow every 10 degree.
9. the evaluation method of semisubmersible platform stream loading according to claim 4, which is characterized in that the semisubmersible platform
Including stull described in two floating drums being spaced apart from each other, four columns being spaced apart from each other and two groups, cross described in every group
Support is connect with two columns；
The sheltering coefficient of the floating drum is according to the ratio cc of spacing and height between two floating drums1And the air of the floating drum
Power solidity ratio β1It determines；
The sheltering coefficient of the column is according to the ratio cc of spacing and height between adjacent two column2And the column
Air force solidity ratio β2It determines；
The sheltering coefficient of the stull is according to the ratio cc of spacing and height between adjacent two stull3And the stull
Air force solidity ratio β3It determines.
10. the evaluation method of semisubmersible platform stream loading according to claim 3, which is characterized in that the cross of the floating drum
Section resistance coefficient CD1_1According to the ratio of the cross-sectional width of the floating drum and cross-sectional height, cross section chamfer radius and cross
The ratio of depth of section is determining, the length resistance coefficient C of the floating drumD1_2Take the 2% of the floating drum section resistance coefficient；
The cross section lateral resistance coefficient C of the columnD2_1According to the cross section lateral length of the column and cross-sectional width
The ratio of ratio, section chamfer radius and cross section lateral length is determining, the cross section longitudinal resistance coefficient C of the columnD2_2
According to the cross section longitudinal length of the column and the ratio of cross-sectional width, section chamfer radius and cross section lateral length
Ratio determines；
The cross section resistance coefficient C of the stullD3_1It is determined according to the ratio of cross-sectional width and cross-sectional height, the stull
Length resistance coefficient CD3_2Take the stull section resistance coefficient CD3_12%.
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