CN105224745B - Ship loading performance optimization system - Google Patents
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Abstract
The invention discloses one kind can help deck officer to adjust method of ship floating condition, stability and intensity, optimize ship's navigation trim, the ship specialty calculation of loading system of real-time Simulation ship loading process, i.e. ship loading instrument.The present invention includes the calculating of ship performance data, and ship performance is checked, the optimization of ship trim and four sub- computing systems of ship loading process real-time Simulation.By selecting different sub- computing systems and its mutual cooperation between them, corresponding ship parameter is inputted, safety of ship, the master data condition of economic navigation can be obtained.Present invention also offers the method that method of ship floating condition adjustment, stability and strength accounting, trim optimization and real-time Simulation ship loading process are carried out using above-mentioned software.The present invention is able to ensure that ship loading and navigation safety, simplifies ship loading operation and saves the energy, so as to improve the security of Shipping and economy, largely alleviates the burden of marine navigator.
Description
Technical field
The present invention relates to operation of ship management domain, and in particular to a kind of ship loading performance optimization system.
Background technology
Oneself is long with building origin for the design of ship, due to the advantages that its transport capacity is strong, economic performance is good, in seventy or eighty years
In generation, is developed faster, and especially large-scale bulk freighter and container ship are quickly grown.Due to the continuous increasing of cargo transport demand
It is subject to and the continuous progress of shipbuilding technology, ship development tends to standardize, maximized, by early stage small tonnage to six the seventies ten thousand
More than ten tons tonne again up to now, and also have the trend for continuing increase.
But marine ships accident, all the time along with the development of fleet, the safety for ensureing Shipping is the one of Shipping
Item important process.Analyzed from substantial amounts of marine accident survey, prestowage is unreasonable can be formed the serious hogging of ship or in hang down, it is special
It is not that powerful shearing and moment of flexure, distortion torque will be produced under the effect of surging, causes rib sealing-off, rupture plate etc. critical
Phenomenon, cause ship that Ship Structure damage occurs when filling heavy cargo or alternate hold under the conditions of harsh climate even from interruption
Split.Meanwhile with the raising of ship energy cost and the expansion of fleet's scale, reduce Shipping energy consumption and improve Shipping
Efficiency also becomes particularly significant.
As can be seen here, carry out rationally careful inspection to hull to check, ship is carried out rationally to load and enter ship
Row ship resistance optimization is to ensure ship transportation safety, improves Shipping efficiency and reduces the important way of Shipping energy consumption
Footpath.
The content of the invention
For the active demand of prior art, the present invention provides a kind of ship loading performance optimization system, it is intended that
The stability, floading condition and intensity of ship are effectively checked using computer auxiliaring means, and ship loading and navigation are hindered
Power carries out simulation optimization, so as to ensure ship transportation safety, improves Shipping efficiency and reduces Shipping energy consumption.
A kind of ship loading performance optimization system, including：
Ship performance parameter calculating module, for calculating the initial stability of ship after light weight, clean ship barycentric coodinates, prestowage
The drinking water of ship tail, ship cross section after prestowage after ship draft fore, prestowage after statical stability lever, prestowage after height value, prestowage
Shearing and moment of flexure；
Ship performance checks module, for compared with stability desired value, metacentric height angle value, statical stability lever to be completed into ship
The stability of oceangoing ship is checked；By ship draft fore, the drinking water of ship tail compared with floading condition desired value, the floading condition for completing ship is checked；By ship
The shearing and moment of flexure in oceangoing ship cross section contrast with intensity targets value, complete ships strength and check；
Ship trim optimization module, it is approximately expression drinking water, boat by trim Optimized model for building trim Optimized model
The three-dimensional response surface of relation between speed and Angle of Trim and real shipowner's acc power, searched respectively in the three-dimensional response surface of corresponding each speed of a ship or plane
The minimum curve of the real shipowner's acc power of one, rope is designated as Optimum Trim curve, and the trim curve and the intersection point of every water line are
The minimum Optimum Trim value of main engine power under the speed of a ship or plane；
Ship loading optimization module, for real-time reception prestowage planning information, call ship performance parameter calculating module and
Ship performance checks module and completes vessel stability, floading condition, strength check, if check result is safe, continues to load；If school
Core result is dangerous, then stops current loading, be adjusted to prestowage position and with carrying capacity, check again, until all goods fill
Load finishes.
Further, the ship trim optimization module is used to build trim Optimized model：PsFor main engine power, T is trim value, after D represents that Mean Draught value, Mean Draught value are equal to prestowage
Ship draft fore and the average of tail drinking water, V represent speed of a ship or plane variable, V0For the current speed of a ship or plane, D0For current Mean Draught value, T1To work as
It is preceding to allow minimum trim value, T2Allow maximum trim value to be current；
It is approximately expression drinking water, relation between the speed of a ship or plane and Angle of Trim and real shipowner's acc power by the trim Optimized model
Three-dimensional response surfaceY is main engine power Ps, variable xiFor T, D,
V }, variable number k=3, β0For constant term, βiFor linear coefficient, βiiFor second order coefficient, βijIt is residual to calculate for the coefficient of coup, ε
It is remaining；
By sampled value (Ps, T, D, V) substitute into the three-dimensional response surface and determine each term coefficient, so as to complete the dimension of response surface three
Learn the foundation of model；
A minimum curve of real shipowner's acc power is searched for respectively in the three-dimensional response surface of corresponding each speed of a ship or plane to be designated as most preferably
The intersection point of trim curve, the trim curve and every water line is the Optimum Trim value that main engine power is minimum under the speed of a ship or plane.
The present invention uses computer auxiliaring means, and optimized configuring makes full use of the delivered payload capability of ship, and has ship
Appropriate stability, enough intensity, reasonable trim and optimal navigation posture, reaching ensures navigation safety, optimization
Ship loading operation and the purpose for reducing ship energy consumption.Ship trim optimization module need not change Ship Hull Lines and increase other ships
Easy to use and reliable with equipment, the trim angle that need to only adjust ship can reach the effect saved the energy, reduce discharge.
Brief description of the drawings
Fig. 1 is ship loading performance optimization system general frame figure of the present invention；
Fig. 2 is that initial stability of vessel calculates schematic diagram；
Fig. 3 is ship curve of static stability lever figure；
Fig. 4 is method of ship floating condition figure；
Fig. 5 is ships strength curve map；
Fig. 6 Ship's Optimum Trims display figure；
Fig. 7 is that trim optimizes response surface schematic diagram；
Fig. 8 is ship loading optimization process schematic diagram.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with drawings and Examples,
The present invention is described in further detail.It should be appreciated that specific embodiment described herein is only used for explaining the present invention,
It is not intended to limit the present invention.In addition, technical characteristic involved in each embodiment of invention described below is only
Conflict can is not formed each other to be mutually combined.
As shown in figure 1, the invention provides a kind of ship loading performance optimization system, including ship performance parameter to calculate mould
Block, ship performance check module, ship trim optimization module and prestowage planning optimization module, and each module is described in detail below.
1st, ship performance parameter calculating module
(1) calculating of ship weight and barycentric coodinates
Wherein, Δ is ship gross weight (t), WLFor light weight (t), xL、yL、zLFor the coordinate (m) of clean ship center of gravity, Pi
For all kinds of Weights Loaded (t), including goods weight, fuel oil, lubricating oil, fresh water, ballast water, food etc., xi、yi、ziTo be corresponding each
Barycentric coodinates (m), C is ship's constant (t), xC、yC、zCFor the coordinate (m) of constant center of gravity, (xg, yg, zg) total for ship
Barycentric coodinates.
(2) initial stability of vessel calculates
As shown in Fig. 2 the initial Water Plane of ship is WL, the Water Plane after ship heel is WlLl, ship metancenter is M, center of gravity
For G, θ is ship's heeling angle, and ship centre of buoyancy of top-uping is B, and centre of buoyancy is B after heell, the intersection point of two buoyancy lines is before and after heel
M, GZ are metacentric arm.
Initial stability equation
MR=9.18 Δ GMsin θ
Wherein MRRighting couple (KNm) is represented, θ represents ship's heeling angle (°), and GM is initial metacentric height (m).
GM is the basic sign for weighing initial stability of vessel size.Initial metacentric height GM expression formula
GM=KM-KG
KM is height of the Transverse Metacenter away from ship baseline in formula, can be looked into according to the displacement after ship loading and take hydrostatic curve
Table is obtained by hydrostatic calculation, and KG is the height of ship distance of centre of gravity ship baseline, also the as vertical coordinate of ship center of gravity
zg。
Each liquid tank on ship,, should with ship heel to side movement is tilted in the whole cabin of liquid underfill during space
Liquid surface is referred to as free surface.When ship inclination, the liquid in tank flows therewith, makes the center of gravity of liquid to tilting a side
It is mobile, a heeling moment is produced, so as to reduce original righting couple, namely reduces initial metacentric height.Its decreasing value is
In formula, fluid density (t/m that ρ is loaded for certain liquid tank3), ixIt is free surface in certain liquid tank to liquid
Area inertia moment (the m of face central shaft4)。
If liquid is underfilled with liquid tank, initial metacentric height should carry out free surface amendment, revised just through free surface
Metacentric height value is
G0M=KM-KG- δ GMf
(3) ship stability at large angle calculates
High inclination-angle heel occurs under external force for ship, and after external force disappears, ship gravity and buoyancy form a couple,
Its torque is moment of statical stability
MS=Δ GZ
Ship is under conditions of displacement is certain, moment of statical stability MSSize depends on ship center of gravity buoyancy to after tilting and made
With the vertical range of line, i.e., depending on statical stability lever GZ, and it is directly proportional to GZ.Basic point is chosen as the reference for measuring the arm of force
Point, then statical stability lever GZ be represented by
GZ=KN-KG0sinθ
KN is lever of form stability in formula, and it is the buoyancy to after tilting of keel baseline midpoint i.e. the origin of coordinates
Line hangs down away from KN is only relevant with the underwater shape of hull, and KN values look into stability intersection by ship loading displacement of volume Δ and Angle of Heel θ
Curve determines.KG0For through the revised ship distance of centre of gravity baseline height of free surface.
After prestowage statical stability lever GZ follow Angle of Heel θ change and changing rule, GZ and θ relation is depicted as one
Curve, referred to as curve of static stability lever.
(4) ship's floating condition calculation
Method of ship floating condition can balance underwater head and the tail drinking water with ship and represent.The size of ship trim drauht difference table
Show, drauht difference refers to ship draft fore dfD is absorbed water with tailaDifference, represented with t.
Δ is vessel displacement (t) in formula, xgFor ship center of gravity ordinate (m), xbFor ship centre of buoyancy ordinate (m), MTC
For Trimming Moment per cm (tm).
Ship head and the tail drinking water dfAnd daTried to achieve by following formula
In formula, dMFor ship equivalent draft (m), LBP(m) is grown for ship head and the tail intercolumniation, xfFor ship centre of floatation longitudinal coordinate
(m)。
(5) ships strength calculates
The longitudinal difference of gravity and buoyancy suffered by each section upper hull of ship, it is exactly on the section hull outside suffered vertical conjunction
Power, referred to as load.The presence of load on subsection hull, make to be acted on by shearing and moment of flexure on each cross section of hull.It is assumed that
Gravity is distributed as p (x) along captain's, and buoyancy is distributed as b (x) along captain's, and wherein x is the longitudinal coordinate along captain direction, then
Their difference is exactly to cause the load q (x) of hull beam longitudinal bending, i.e.,
Q (x)=p (x)-b (x)
According to the theory of hull beam, shearing N (x) and moment M (x) on any cross section of ship are represented by
2nd, ship performance checks module
(1) stability is checked
It should meet following basic weighing apparatus alignment request simultaneously through the revised intact stability of free surface under each loading condition of ship：
Initial metacentric height GM is not less than 0.15m；Region area of the curve of static stability lever between 0 °~30 ° of Angle of Heel is not
Less than 0.055mrad；Curve of static stability lever institute's envelope surface product between 0 °~M ° of Angle of Heel is not less than 0.090mrad, and M is
40 ° with the smaller in flooding angle；Curve of static stability lever institute's envelope surface product between 30 °~M ° of Angle of Heel is not less than 0.030m
rad；Righting arm at 30 ° of Angle of Heel is not less than 0.20m；Angle for maximum righting lever is not less than 25 °；
If Calculation of Stability result does not meet safety requirements, calculation of loading system automatic alarm is simultaneously prompted corresponding dangerous former
Cause.
(2) floading condition is checked
Checked according to floading condition weighing apparatus alignment request, the floading condition weighing apparatus alignment request is specially：Ship Mean Draught is not after prestowage
Summer Load Line is can exceed that, Mean Draught is equal to ship draft fore and the average of tail drinking water after prestowage；The drinking water of prestowage rear molding ensures
Propeller is totally submerged；Draft fore can not be less than desired minimum draft fore after prestowage；It is more than 150 meters of ship for captain L,
Draft Forward df after prestowage>0.012L+2, ship Mean Draught dm >=0.02L after prestowageBP+ 2, LBPFor length between perpendiculars；It is right
Yu captain L is less than or equal to 150 meters of ship, bow least draught df after prestowage>0.025L+2, ship Mean Draught after prestowage
dm≥0.02LBP+2；For ton ship, it is desirable to full load tail inclines for 0.3m-0.6m, and tail inclines for 0.6m-0.8m during semi-load,
Tail inclines for 0.9m-1.9m during underloading.
If floating condition calculation result does not meet safety requirements, calculation of loading system automatic alarm is simultaneously prompted corresponding dangerous former
Cause.
(3) strength check
Accounting specific requirement for longitudinal strength is, under any loading condition, the main shearing on the face of station and curved of ship
Square meets following require:
If strength Calculation Result does not meet safety requirements, calculation of loading system automatic alarm is simultaneously prompted corresponding dangerous former
Cause.
3rd, ship trim optimization module
Ship model is made according to ship table of offsets and molded lines, is marked respectively in ship model stem, middle part and afterbody different
The graduation mark of drinking water, facilitate the adjustment of Angle of Trim.
Carry out the series model resistance test under different drinking water, the different speed of a ship or plane and different Angle of Trims, by result of the test according to
Fu Lao German sides method is converted to the main engine power of real ship.The drag overall C of ship modeltObtained from model test, coefficient of frictional resistance CfBy
1957 ITTC formula obtain, then RRF CRIt can be obtained by following formula：
CRm=Ctm-Cfm=CRs
Subscript m and s represent model and real ship respectively in formula.The total drag coefficients C of real shiptsIt can be obtained by following formula：
Cts=Cfs+CRs+ΔCf
Δ C in formulafCoefficient is subsidized for roughness, is taken as Δ Cf=0.4 × 10-3, because real ship surface is relatively rough, and ship
Mould surface is very bright and clean, therefore real ship coefficient of frictional resistance will be corrected.The drag overall R of real ship can be obtained by following formula：
In formula, S is wetted surface area when real ship navigates by water in water, and ρ is the density of water.Therefore, real ship effective power (PE)
It can be expressed as：
PE=R × V
V is the real ship speed of a ship or plane in formula.Finally, the main engine power P of real shipSIt can be obtained by following formula：
ηSFor shafting transmission efficiency, ηGFor gear-box efficiency, ηDFor propulsive efficiency.Three passes through Ship Design data
Find.
Based on the main engine power of the real ship under different drinking water, the different speed of a ship or plane and different Angle of Trims, trim optimization is formed
Data source.Using trim, drinking water and the speed of a ship or plane as design variable, using main engine power as object function, with trim scope, draft: range and
Speed of a ship or plane requirement is constraints, establishes trim optimized mathematical model, as follows：
PS=f (T, D, V)
Wherein, PSFor main engine power, T is trim value, and D is Mean Draught value, and V is the speed of a ship or plane, V0For the current speed of a ship or plane, D0To work as
Preceding drinking water, T1Currently to allow minimum trim value, T2Allow maximum trim value to be current；
Established according to second order polynomial response surface model can be absorbed water with approximate expression, the speed of a ship or plane and Angle of Trim and real shipowner's machine work(
The three-dimensional response surface of relation, its expression formula are between rate：
Wherein k is variable number, β0For constant term, βiFor linear dimensions coefficient, xiFor variable, βijFor coupling parameter coefficient,
ε is calculating residual volume.In order to solve the key point on response surface (maximum of points, minimum point or flex point), divalence multinomial rings
Surface model is answered to be necessary to include quadratic term, such as following formula：
Wherein βiiFor second order parameter coefficient.
By sampled value (Ps, T, D, V) substitute into the three-dimensional response surface and determine each term coefficient, so as to complete the dimension of response surface three
The foundation of model is learned, as shown in Figure 7.
With Direct search algorithm, it can find on the response surface of corresponding each speed of a ship or plane and an Optimum Trim song be present
The intersection point of line, the trim curve and every water line is at the minimum Optimum Trim value of main engine power.
Above-mentioned data and searching process are written as by executable trim using Fortran language combination c# language and optimize generation
Code, and it is fused in ship loading instrument system, a sub- computing system as ship loading instrument.During real ship application, root
According to the loading conditions of ship, the current speed of a ship or plane of input ship, displacement and the first drinking water, you can provide ship under the loading condition
The Optimum Trim state that should be kept so that ship is navigated by water with the resistance of minimum, saves fuel.
4th, ship loading optimization module
Statistical classification, including the information such as the size in cabin, position, bearing capacity are carried out to all kinds of cabin information of ship；Goods
Before thing loads, statistical classification, including the information such as the volume of goods, weight, state are carried out to goods information.By the detailed letter in cabin
Breath sends prestowage planning optimization module to, can call at any time, and cabin loading situation is shown with talking with box form.
Ship performance parameter calculating module and ship performance is called to check module and complete vessel stability, floading condition, strength check,
If check result is safe, continue to load；If check result is dangerous, stop current loading, to prestowage position and prestowage
Amount is adjusted, and is checked again, is finished until all goods load, and it is as shown in Figure 8 to load model.
Before Ship's Cargo loading, a series of loading operation program is made, each loading operation program is carried out
Real-time Simulation, including loading sequence and single useful load are monitored and tested, in this process, ship is shown in real time
The behavior patterns such as the shearing of stability and each section, moment of flexure change.Driver chooses in the operation procedure for be loaded experiment
One ideal operation procedure, is loaded in real time, it is ensured that the safety of ship in loading process.
As the ship professional software towards navigating officer, stowage calculation system is except functionally as far as possible complete
Kind, data are as accurate outer as possible, and interface should be as far as possible succinct friendly, easy to operation, and has good fault-tolerance.Specific embodiment party
Formula is as follows：
1. enter stowage calculation system main menu and sub- computing system.
2. goods, oil, water by ship etc. load information and are input to ship loading performance optimization system.
3. the ship loading performance optimization system according to required for user calculates data, different sub- computing systems is selected,
Include the calculating of ship performance data, the check of Ship navigation performance, the optimization of ship trim calculates and ship loading optimization.
4. different ships datas is inputted in corresponding sub- computing system, it is specific as follows：
(1) in the calculating of ship performance data, including ship weight and barycentric coodinates calculate, initial stability of vessel calculates,
Ship stability at large angle calculates, ship's floating condition calculation and ships strength calculate；
(2) in the check of Ship navigation performance, the result of ship performance data calculating is called.Input initial stability of vessel meter
The result data calculated with ship stability at large angle is calculated, according to the related specifications of vessel stability, stability check is carried out to ship, and
Whether prompting is safe；The result data of ship's floating condition calculation is inputted, according to the related specifications of method of ship floating condition, floading condition is carried out to ship
Check, and whether safe prompt；The result data that ships strength calculates is inputted, according to the related specifications of ships strength, to ship
Strength check is carried out, and whether safe is prompted；
(3) in the optimization of ship trim, current displacement, the speed of a ship or plane and draft fore and tail drinking water, the trim for inputting ship are excellent
Beggar's computing system is voluntarily optimized to the trim of ship.
(4) in ship loading process real-time Simulation, by inputting cabin, goods information, to prefabricated each loading pattern
Simulated test is carried out, and monitors vessel stability and strength information in loading process in real time.
5. ship loading instrument integrates ship loading information and ship input data, sub- computing system is not according to selected by user
Together, corresponding data processing is carried out.
6. result is shown with printing (output), specific as follows：
(1) in the calculating of ship performance data, ship weight and barycentric coodinates calculate the gross weight and again of output ship
Heart coordinate, initial stability of vessel calculate the statical stability lever of output ship, and ship stability at large angle calculates the statical stability of output ship
Arm of force curve, as shown in Figure 3.Ship's floating condition calculation exports method of ship floating condition figure, as shown in Figure 4.Ships strength calculates output ship
Intensity curve, as shown in Figure 5；
(2) in the check of Ship navigation performance, whether vessel stability, floading condition and intensity, which meet, requires, is utilized by user
Ship performance data result of calculation, the related specifications according to ship are judged, and display security warning and prompting；
(3) in the optimization of ship trim, when output ship has a minimum ship resistance under certain displacement and the speed of a ship or plane
Head and the tail absorb water, as shown in Figure 6.
(4) in ship loading process real-time Simulation, the stability of ship and shearing, being curved for each section in loading process are exported
Square situation of change.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles of the invention etc., all should be included
Within protection scope of the present invention.
Claims (2)
- A kind of 1. ship loading performance optimization system, it is characterised in that including：Ship performance parameter calculating module, for calculating the initial metacentric height of ship after light weight, clean ship barycentric coodinates, prestowage Value, after prestowage after statical stability lever, prestowage after ship draft fore, prestowage after the drinking water of ship tail, prestowage ship cross section shearing And moment of flexure；Ship performance checks module, for compared with stability desired value, metacentric height angle value, statical stability lever to be completed into ship Stability is checked；By ship draft fore, the drinking water of ship tail compared with floading condition desired value, the floading condition for completing ship is checked；Ship is horizontal The shearing and moment of flexure of section contrast with intensity targets value, complete ships strength and check；Ship trim optimization module, for building trim Optimized model, by trim Optimized model be approximately expression drinking water, the speed of a ship or plane and The three-dimensional response surface of relation between Angle of Trim and real shipowner's acc power, one is searched for respectively in the three-dimensional response surface of corresponding each speed of a ship or plane The minimum curve of bar reality shipowner acc power is designated as Optimum Trim curve, and the trim curve and the intersection point of every water line are the boat The minimum Optimum Trim value of the lower main engine power of speed；Ship loading optimization module, for real-time reception prestowage planning information, call ship performance parameter calculating module and ship Service check module completes vessel stability, floading condition, strength check, if check result is safe, continues to load；If check knot Fruit is dangerous, then stops current loading, be adjusted to prestowage position and with carrying capacity, check again, until all goods have loaded Finish；The ship trim optimization module is used to build trim Optimized model：PsFor main engine power, T For trim value, D represents Mean Draught value, and Mean Draught value is equal to ship draft fore and the average of tail drinking water after prestowage, V expression boats Fast variable, V0For the current speed of a ship or plane, D0For current Mean Draught value, T1Currently to allow minimum trim value, T2Allow maximum to be current Trim value；Be approximately expression drinking water by the trim Optimized model, between the speed of a ship or plane and Angle of Trim and real shipowner's acc power relation three-dimensional Response surfaceY is main engine power Ps, variable xiFor { T, D, V }, variable Number k=3, β0For constant term, βiFor linear coefficient, βiiFor second order coefficient, βijIt is remaining to calculate for the coefficient of coup, ε；By sampled value (Ps, T, D, V) substitute into the three-dimensional response surface and determine each term coefficient, so as to complete response surface 3-d mathematicses mould The foundation of type；A minimum curve of real shipowner's acc power is searched for respectively in the three-dimensional response surface of corresponding each speed of a ship or plane is designated as Optimum Trim The intersection point of curve, the trim curve and every water line is the Optimum Trim value that main engine power is minimum under the speed of a ship or plane.
- 2. ship loading performance optimization system according to claim 1, it is characterised in that the ship performance checks module Including：Stability checks submodule, and for being checked according to stability weighing apparatus alignment request, the stability weighing apparatus alignment request is specially：Initial stability Height GM is not less than 0.15m；Region area of the curve of static stability lever between 0 °~30 ° of Angle of Heel is not less than 0.055m rad；Curve of static stability lever institute's envelope surface product between 0 °~M ° of Angle of Heel is not less than 0.090mrad, and M is 40 ° and flooding angle In smaller；Curve of static stability lever institute's envelope surface product between 30 °~M ° of Angle of Heel is not less than 0.030mrad；Angle of Heel Righting arm at 30 ° is not less than 0.20m；Angle for maximum righting lever is not less than 25 °；Floading condition checks submodule, and for being checked according to floading condition weighing apparatus alignment request, the floading condition weighing apparatus alignment request is specially：After prestowage For ship Mean Draught no more than Summer Load Line, Mean Draught is equal to ship draft fore and the average of tail drinking water after prestowage；Match somebody with somebody Carry rear molding drinking water and ensure that propeller is totally submerged；Draft fore can not be less than desired minimum draft fore after prestowage；It is big for captain L The Draft Forward df after 150 meters of ship, prestowage>0.012L+2, ship Mean Draught dm >=0.02L after prestowageBP+ 2, LBPFor Length between perpendiculars；It is less than or equal to 150 meters of ship, bow least draught df after prestowage for captain L>0.025L+2, match somebody with somebody Ship Mean Draught dm >=0.02L after loadBP+2；For ton ship, it is desirable to which full load tail inclines for 0.3m-0.6m, during semi-load Tail inclines for 0.6m-0.8m, and tail inclines for 0.9m-1.9m during underloading；Strength check submodule, for being checked according to Strength criteria requirement, the Strength criteria requirement is specially：After prestowage The shearing and moment of flexure in ship cross section meet following require：
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| CN105825061B (en) * | 2016-03-17 | 2018-06-29 | 大连海事大学 | A kind of arbitrary floating condition calculation method of ship based on STL models |
| CN109808839B (en) * | 2017-11-22 | 2020-07-17 | 中冶宝钢技术服务有限公司 | Loading method for ship |
| CN110110352B (en) * | 2019-03-20 | 2023-06-27 | 浙江海洋大学 | Ship longitudinal attitude and resistance forecasting method based on overlapped grids |
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