CN104743057A - Weight calculating method and system of C-shaped independent liquid cargo tank - Google Patents
Weight calculating method and system of C-shaped independent liquid cargo tank Download PDFInfo
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- CN104743057A CN104743057A CN201510158285.6A CN201510158285A CN104743057A CN 104743057 A CN104743057 A CN 104743057A CN 201510158285 A CN201510158285 A CN 201510158285A CN 104743057 A CN104743057 A CN 104743057A
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Abstract
The invention provides a weight calculating method and system of a C-shaped independent liquid cargo tank; the method is applied to the design of a liquefied gas carrier and comprises the steps: calculating a steam pressure and a liquid pressure according to the basic parameters of the C-shaped independent liquid cargo tank; calculating an internal pressure and calculating a minimum plate thickness of an enclosure according to the internal pressure; dividing plate seams of a tank body and enclosure covers of the C-shaped independent liquid cargo tank, thereby obtaining a plurality of plates; gaining specific areas of the plates by adopting an integral method, thereby obtaining the specific area of the whole C-shaped independent liquid cargo tank; obtaining the weight of the enclosure of the C-shaped independent liquid cargo tank according to the specific area of the C-shaped independent liquid cargo tank, the minimum plate thickness of the enclosure and the basic parameters; and calculating the weight of the accessories of the C-shaped independent liquid cargo tank, thereby obtaining the weight of the C-shaped independent liquid cargo tank.
Description
Technical field
The invention belongs to the design field of the C type independent liquid cargo tank of liquefied gas carrier, particularly relate to a kind of method of calculating and system of weight of C type independent liquid cargo tank of liquefied gas carrier.
Background technology
Along with widely using of clean energy resource, the construction market of liquefied gas carrier also day animando.Liquefied gas carrier is the boats and ships of a kind of hightech, high added value, is mainly used in conveying liquified hydrocarbon gas as petrochemicals and liquefied ammonia such as propane, butane, ethene, propylene, butadidenne, polyvinylchloride monomers.Now, due to the continuous increase of energy demand, the rising tendency of oil gas product is irreversible, and the demand of liquefied gas carrier is also increasing.
Different with transportation mode according to the storage of blue gas, liquefied gas carrier roughly can be divided three classes: full voltage type liquefied gas carrier, half-cold, half pressure type liquefied gas carrier and full-cool liquefied gas carrier.The goods of full voltage type liquefied gas carrier normally loads and transports at normal temperatures, and cargo tank is pressure container, i.e. C type independent liquid cargo tank, and it does not need insulator and liquefaction device again; And full voltage type liquefied gas carrier is due to the material of the container that is stressed and manufacturing condition restriction, therefore is small boat.The goods of half-cold, half pressure type liquefied gas carrier is generally to carry out loading and transporting lower than the state of normal temperature; Container Loading is in the C type independent liquid cargo tank having thermal break coated, and half-cold, half pressure type liquefied gas carrier is provided with the reliquefaction plant controlling cargo temperature or pressure.
The temperature of the C type independent liquid cargo tank shipment of liquefied gas carrier generally has three kinds: one-163 DEG C, is applicable to middle-size and small-size blue gas (LNG:Liquefied Natural Gas) ship; Two is-104 DEG C, can adapt to ethene, autogas (LPG:LiquefiedPetroleum Gas) and various chemical gas, be commonly referred to LEG ship; Also have one to be-48 DEG C, to adapt to propylene, LPG and various chemical gas, be commonly referred to LPG ship.
C type independent liquid cargo tank is the most frequently used cargo containment system.But in the initial stage of design, usually need the weight of C type independent liquid cargo tank to carry out some basic calculating, when also non-Modling model, directly can design rapidly according to the main dimension of C type independent liquid cargo tank and calculate its weight and just seem particularly necessary.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of computation method for hot and system of C type independent liquid cargo tank, for solving in prior art when not Modling model, the problem of the kind of C type independent liquid cargo tank cannot be calculated.
For achieving the above object and other relevant objects, the invention provides a kind of computation method for hot of C type independent liquid cargo tank, be applied to the design of liquefied gas carrier, the computation method for hot of described C type independent liquid cargo tank comprises: step one, the steam pressure P of C type independent liquid cargo tank according to the Parameter Calculation of described C type independent liquid cargo tank
0with fluid pressure P
gd; Step 2, according to described steam pressure P
0with described fluid pressure P
gdcalculate the internal pressure P of described C type independent liquid cargo tank
eq, and according to described internal pressure P
eqcalculate the minimum thickness of slab t of housing of described C type independent liquid cargo tank; Step 3, carries out plate seam to the cylindrical shell of described C type independent liquid cargo tank and end socket and divides, obtain multiple plate; Adopt the method for integration to ask for the face area of multiple described plate, thus obtain the face area S of whole described C type independent liquid cargo tank; Step 4, obtains the case weight W of described C type independent liquid cargo tank according to face area S, the described housing minimum thickness of slab t of described C type independent liquid cargo tank and described Parameter Calculation
0; Step 5, calculates the weight W ' of the annex of described C type independent liquid cargo tank, thus obtains the weight W of described C type independent liquid cargo tank: the weight W of described C type independent liquid cargo tank equals described case weight W
0add the weight W ' of described annex.
Alternatively, the described basic specification of described C type independent liquid cargo tank comprises: to the actual waterline of the fore-and-aft distance between the described C type independent liquid cargo tank center of gravity of loading, boats and ships to the radius r of the vertical distance between the described C type independent liquid cargo tank center of gravity of loading, the density p of manufactured materials of described C type independent liquid cargo tank, length l, the width b of described C type independent liquid cargo tank, highly h and shell portion in commercial speed, structure captain, molded breadth, block coefficient, ship.
Alternatively, in described step one, described steam pressure P
0be greater than the operation pressure of described C type independent liquid cargo tank; And described steam pressure P
0for: P
0=0.2+0.1AC (ρ
r)
1.5; Wherein, A=0.0185 (σ
m/ Δ σ
a)
2, σ
mrepresent main membrane stress, Δ σ
arepresent Dynamic Membrane stress allowable; C represents the characteristic dimension of described C type independent liquid cargo tank, and C=max (0.75b, 0.75l); ρ
rrepresent the relative density of goods, ρ
rwith temperature correlation.
Alternatively, in described step one, described fluid pressure P
gdfor:
wherein, β represents the direction of spot pressure; α
βrepresent the non-dimensional acceleration that β direction is caused by gravity and live load; Z
βrepresent spot pressure along β direction upwards to the maximum liquid-column height of the coverboard of described C type cargo tank, and described maximum liquid-column height Z
βrelevant to the end socket form of described C type independent liquid cargo tank.
Alternatively, the described end socket form of described C type independent liquid cargo tank comprises dome head and dished end.
Alternatively, the described internal pressure P of described C type independent liquid cargo tank
eqfor: P
eq=P
0+ (P
gd)
max.
Alternatively, the described annex of described C type independent liquid cargo tank comprises ring stiffener, vacuum ring and centerline bulkhead; Calculated the size of described annex by the method for finite element, thus obtain the weight W ' of described annex.
A kind of Weight computation system of C type independent liquid cargo tank, be applied to the design of liquefied gas carrier, the Weight computation system of described C type independent liquid cargo tank comprises parameter input module, end socket selection module, calculation of pressure module, the division of plate seam and face area computing module, case weight computing module, cargo tank Weight computation module and output module; Wherein, described parameter input module is for the annex of the basic specification and described C type independent liquid cargo tank that input described C type independent liquid cargo tank; Described end socket selects module for selecting the end socket form of described C type independent liquid cargo tank; Described calculation of pressure module is used for according to described basic specification and described end socket form calculus steam pressure, fluid pressure and internal pressure; Described plate seam divides and face area computing module is used for dividing according to the plate seam that carries out of described end socket form to described C type independent liquid cargo tank; And adopt the method for integration to calculate the face area of described C type independent liquid cargo tank; Described case weight computing module is used for calculating the minimum thickness of slab of housing according to described internal pressure; And calculate case weight according to the minimum thickness of slab of described housing and described face area; Described cargo tank Weight computation module is used for the weight calculating described C type independent liquid cargo tank according to described case weight and described annex; Described output module is for exporting the face area of described C type independent liquid cargo tank, minimum thickness of slab, density of material and weight.
Alternatively, described basic specification comprises: to the actual waterline of the fore-and-aft distance between the described C type independent liquid cargo tank center of gravity of loading, boats and ships to the radius r of the vertical distance between the described C type independent liquid cargo tank center of gravity of loading, the density p of manufactured materials of described C type independent liquid cargo tank, length l, the width b of described C type independent liquid cargo tank, highly h and shell portion in commercial speed, structure captain, molded breadth, block coefficient, ship.
Alternatively, described end socket form comprises dome head and dished end.
As mentioned above, the computation method for hot of C type independent liquid cargo tank of the present invention and system, can according to the basic specification of the cargo tank of input, calculate the plate area of cargo tank and meet the minimum thickness of code requirement, final calculating obtains the total weight of cargo tank, for liquefied gas carrier early stage contract design quick response provide design considerations.
Accompanying drawing explanation
Fig. 1 is shown as the schematic flow sheet of the computation method for hot of a kind of C type independent liquid cargo tank disclosed in the embodiment of the present invention.
Fig. 2 is shown as the liquid height Z of the shell portion longitudinal plane of a kind of C type independent liquid cargo tank disclosed in the embodiment of the present invention
β-1and Z
β-2and schematic diagram.
Fig. 3 is shown as the shell portion Transverse plane liquid height Z of a kind of C type independent liquid cargo tank disclosed in the embodiment of the present invention
β-2schematic diagram.
Fig. 4 is shown as the liquid height Z of the end socket part longitudinal plane of a kind of C type independent liquid cargo tank disclosed in the embodiment of the present invention
β-1and Z
β-2and schematic diagram.
Fig. 5 is shown as the end socket parts transversely flat liquid height Z of a kind of C type independent liquid cargo tank disclosed in the embodiment of the present invention
β-2schematic diagram.
Fig. 6 and Fig. 7 is shown as the plate seam division figure of duplex cylindrical shape C type independent liquid cargo tank disclosed in the embodiment of the present invention.
Fig. 8 is shown as the plate seam division figure of the shell portion of the C type independent liquid cargo tank of conical ears tank disclosed in the embodiment of the present invention.
Fig. 9 is shown as the structural representation of the Weight computation system of a kind of C type independent liquid cargo tank disclosed in the embodiment of the present invention.
Figure 10 is shown as the parameters input interface schematic diagram of the Weight computation system of a kind of C type independent liquid cargo tank disclosed in the embodiment of the present invention.
Figure 11 is shown as the parameter output interface schematic diagram of the Weight computation system of a kind of C type independent liquid cargo tank disclosed in the embodiment of the present invention.
Element numbers explanation
The Weight computation system of 100 C type independent liquid cargo tanks
110 parameter input module
120 end sockets select module
130 calculation of pressure modules
140 plate seams divide and face area computing module
150 case weight computing modules
160 cargo tank Weight computation modules
170 output modules
Detailed description of the invention
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art the content disclosed by this specification sheets can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by detailed description of the invention different in addition, and the every details in this specification sheets also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.It should be noted that, when not conflicting, the feature in following examples and embodiment can combine mutually.
It should be noted that, the diagram provided in following examples only illustrates basic conception of the present invention in a schematic way, then only the assembly relevant with the present invention is shown in graphic but not component count, shape and size when implementing according to reality is drawn, it is actual when implementing, and the kenel of each assembly, quantity and ratio can be a kind of change arbitrarily, and its assembly layout kenel also may be more complicated.
Embodiment 1
Present embodiment discloses a kind of computation method for hot being applied to the design of liquefied gas carrier IMO C type independent liquid cargo tank, it is according to IGC code requirement, when only inputting the basic specification of C type independent liquid cargo tank, the Weight computation of C type independent liquid cargo tank can be completed.Wherein, basic specification comprises: to the actual waterline of the fore-and-aft distance between the C type independent liquid cargo tank center of gravity of loading, boats and ships to vertical distance, the density p of manufactured materials of C type independent liquid cargo tank, the radius r of length l, the width b of C type independent liquid cargo tank, highly h and shell portion between the C type independent liquid cargo tank center of gravity of loading in commercial speed, structure captain, molded breadth, block coefficient, ship.
The computation method for hot of the C type independent liquid cargo tank of the present embodiment is concrete as shown in Figure 1, comprising:
Step one, calculates the steam pressure P of C type independent liquid cargo tank
0with fluid pressure P
gd:
The steam pressure P of C type independent liquid cargo tank
0numerical value can not lower than the operation pressure of C type independent liquid cargo tank, and steam pressure P
0for:
P
0＝0.2+0.1AC(ρ
r)
1.5。
Wherein, A=0.0185 (σ
m/ Δ σ
a)
2; σ
mbe the main membrane stress of design, unit is N/mm
2; Δ σ
abe Dynamic Membrane stress allowable, unit is also N/mm
2, and, Δ σ
arelevant with the manufactured materials of C type independent liquid cargo tank.When probability level is 10
-8time:
C type independent liquid cargo tank adopts double carbide (pearlitic matrix)/martensite and austenic steel, Δ σ
a=55N/mm
2;
C type independent liquid cargo tank adopts aluminum alloy (5083-0), Δ σ
a=25N/mm
2.
C represents the characteristic dimension of C type independent liquid cargo tank: C=max (0.75b, 0.75l); Wherein, b is the width (referring to the value of C type independent liquid cargo tank along the transversal vector of boats and ships) of C type independent liquid cargo tank, and l is the length (referring to the value of C type independent liquid cargo tank along the longitudinal direction amount of boats and ships) of C type independent liquid cargo tank;
ρ
rrefer to the relative density of goods, and ρ
rwith the temperature correlation of design.If goods is fresh water, ρ
r=1.
Fluid pressure P
gdwith the non-dimensional acceleration α caused by gravity and live load on arbitrary β direction
βand the maximum liquid-column height Z upwards measured from determined spot pressure along direction β to C type independent liquid cargo tank coverboard
βrelevant:
C type independent liquid cargo tank comprises cylindrical shell and end socket, and the form of end socket is also divided into dome head and dished end.Because spot pressure both may be positioned on the cylindrical shell of C type independent liquid cargo tank, also may be positioned on the end socket of C type independent liquid cargo tank, so its method of calculating of the position of maximum liquid-column height residing for spot pressure is also different; Further, according to the form of end socket, its maximum liquid-column height Z
βalso be difference to some extent.The convenience of the present embodiment in order to calculate, maximum liquid-column height Z when spot pressure being positioned on cylindrical shell or end socket
βmethod of calculating unification be: Z
β=Z
β-1+ Z
β-2.
Such as, C type independent liquid cargo tank adopts the flow container of duplex cylindrical band dome head, as shown in Figures 2 and 3, and the maximum liquid-column height Z at its cylindrical shell place
βfor:
Wherein, r is the radius of cylindrical shell and end socket; L is barrel lenght; Ld is that spot pressure is in the length longitudinally apart from body centre; α is the angle value of spot pressure in cylindrical shell position: be spot pressure in YZ plane, Z axis positive dirction is 0, and anticlockwise direction is the angle value in positive polar coordinate system; β
rfor the angle of heel of liquefied gas carrier; β
pfor the angle value of the casterangle of liquefied gas carrier; LL is the cylinder distance in the heart of ears shape flow container.
C type independent liquid cargo tank adopts the ears shape flow container of dome head, as shown in Figure 4 and Figure 5, and the maximum liquid-column height Z at its end socket place
βfor:
Z
β＝Z
β-1+Z
β-2＝r(1-cosβ
p)+(L+rcosβ)sinβ
p+rcosβ
p
+[(rsinβ·sinα+LL)sinβ
r-rsinβ·cosα·cosβ
r]cosβ
p。
Wherein, r is the radius of cylindrical shell and end socket; L is barrel lenght; LL is the cylinder distance in the heart of ears shape flow container; α is the angle value of spot pressure in end socket position: be spot pressure in YZ plane, Z axis positive dirction is 0, and anticlockwise direction is the angle value in positive polar coordinate system; β is the angle value of spot pressure in end socket position: be spot pressure in X α plane, X-axis positive dirction is 0, and steering pressure point is the angle value in positive polar coordinate system; β
rfor the angle of heel of liquefied gas carrier; β
pfor the casterangle of liquefied gas carrier.
Step 2, calculates the internal pressure P of C type independent liquid cargo tank
eq; And the minimum thickness of slab t of housing of C type independent liquid cargo tank is calculated according to this:
The internal pressure P of C type independent liquid cargo tank
eqwith steam pressure P
0with fluid pressure P
gdrelevant: P
eq=P
0+ (P
gd)
max.
The minimum thickness of slab t of housing is divided into end socket thickness of slab and cylindrical shell thickness of slab.The calculating of end socket thickness of slab and cylindrical shell thickness of slab is all that the principle of design being dependent on pressure container carries out.
Wherein, the end socket thickness of slab of dome head is:
R represents the radius of dome head; σ represents permissible stress; J represents welding efficiency coefficient.
The end socket thickness of slab of dished end is:
D represents the flow container cylindrical shell outer dia of dished end; σ represents permissible stress; J represents welding efficiency coefficient; K represents coefficient.
Cylindrical shell thickness of slab is:
R represents the inner radial of cylindrical shell; σ represents permissible stress; J represents welding efficiency coefficient.
Step 3, carries out plate seam to the cylindrical shell of C type independent liquid cargo tank and end socket and divides, obtain multiple plate; Adopt the method for integration to ask for the face area of multiple plate, thus obtain the face area S of whole C type independent liquid cargo tank:
As mentioned above, C type independent liquid cargo tank can adopt difform flow container.If columnar flow container, so the face area of its correspondence is just easy to calculate: the external surface area namely asking for cylinder or ball.But, the shape of fitfull often that C type independent liquid cargo tank adopts, more commonly duplex drum type brake flow container and conical ears flow container.As shown in Figures 6 and 7, duplex drum type brake flow container is not just cylinder or the ball of rule in the part that two cylinders intersect.As shown in Figure 8, conical ears flow container is also irregular body.To the flow container of these two kinds of shapes, directly to ask for its face area be very complicated and do not have commonality.Therefore, in the present embodiment, carry out plate seam to the cylindrical shell of C type independent liquid cargo tank and end socket to divide, be divided into multiple plate, then the method for calculating of unified polar coordinate system is adopted, adopt the method for integration to ask for the area of each plate, thus obtain the face area S of whole C type independent liquid cargo tank.As shown in Figure 6 and Figure 7, duplex drum type brake flow container generally takes end socket to be divided into two large divisions, close seal head end part is 3 parts (17,18 and 19), ring part near cylindrical shell is divided into 12 parts (05-16), and the thickness of numbering identical expression plate is all equal with area; As shown in Figure 8, the shell portion of conical ears flow container is divided into 10 parts (01-10).According to the flow container situation of reality, according to plate present position and shape, suitable areal calculation formula is selected to calculate.If plate is regular shape, the area formula of correspondingly-shaped is so selected to calculate; If plate is irregularly shaped, then according to form this plate angular coordinate bound a little, asked for the area of plate by integration.
Calculate the area obtaining each plate, so the face area S of C type independent liquid cargo tank is also just very easy to obtain, and is the area sum of each plate of composition C type independent liquid cargo tank.
Step 4, calculates the case weight W of C type independent liquid cargo tank
0:
As everyone knows, the volume that the weight of object equals object is multiplied by the density of object.Also be like this so in the present embodiment, the minimum thickness of slab t of housing that the housing volume of C type independent liquid cargo tank equals C type independent liquid cargo tank is multiplied by the face area S of C type independent liquid cargo tank.The case weight W of C type independent liquid cargo tank
0density with regard to equaling C type independent liquid cargo tank is multiplied by the housing volume of C type independent liquid cargo tank.
Step 5, calculates the weight W ' of the annex of C type independent liquid cargo tank, the final weight W calculating acquisition C type independent liquid cargo tank:
The housing not merely comprising flow container of C type independent liquid cargo tank, is also combined with ring stiffener, vacuum ring and centerline bulkhead etc. usually, therefore, also the weight W ' of these annexes also should be taken into account when calculating the weight W of C type independent liquid cargo tank.In the present embodiment, calculated the structure of ring stiffener, vacuum ring and centerline bulkhead by the method for finite element, thus obtain the weight W ' of annex.At the case weight W of C type independent liquid cargo tank
0basis on, then add that the weight W ' of annex is the weight W of C type cargo tank in proportion.
The step of various method divides above, just in order to be described clearly, can merge into a step or splitting some step, being decomposed into multiple step, when realizing as long as comprise identical logical relation, all in the protection domain of this patent; To adding inessential amendment in algorithm or in flow process or introducing inessential design, but the core design not changing its algorithm and flow process is all in the protection domain of this patent.
Embodiment 2
Present embodiment discloses a kind of Weight computation system being applied to the design of liquefied gas carrier IMO C type independent liquid cargo tank.The Weight computation system of described C type independent liquid cargo tank design is the application module be arranged in computer equipment.This computer equipment be a kind of can according to the program stored in advance, automatically, carry out the modernization intelligent electronic device of massive values computation and various information processing at high speed, its hardware includes but not limited to microprocessor, embedded device etc.The Weight computation system of C type independent liquid cargo tank design starts along with described computer equipment start.As shown in Figure 9, the Weight computation system 100 of C type independent liquid cargo tank design comprises parameter input module 110, end socket selection module 120, calculation of pressure module 130, the division of plate seam and face area computing module 140, case weight computing module 150, cargo tank Weight computation module 160 and output module 170.
Parameter input module 110 is for inputting the basic specification of C type independent liquid cargo tank.Basic specification comprises: to the actual waterline of the fore-and-aft distance between the C type independent liquid cargo tank center of gravity of loading, boats and ships to vertical distance, the density p of manufactured materials of C type independent liquid cargo tank, the radius r of length l, the width b of C type independent liquid cargo tank, highly h and shell portion between the C type independent liquid cargo tank center of gravity of loading in commercial speed, structure captain, molded breadth, block coefficient, ship.In the present embodiment, parameter input module 110 carries out data input by parameters input interface, as shown in Figure 10, if full ship parameter is as the speed of a ship or plane, captain etc., only need, in the input of No1 cargo tank part, in the computation process of other cargo tanks, will directly to quote the data of these parameters; If the data of independent each cargo tank, in order to calculate the maximum non-dimensional acceleration of each cargo tank, need to input the parameters such as the fore-and-aft distance between the cargo tank center of gravity arriving loading in ship.Therefore, need the parameters input part input corresponding data at each cargo tank, the maximum non-dimensional acceleration of different cargo tank will have influence on the pressure head calculating of spot pressure.
Further, parameter input module 110 also can be used for the weight of the non-housing parts inputting C type independent liquid cargo tank, such as annex.Wherein, annex comprises ring stiffener, vacuum ring and centerline bulkhead.
End socket selects module 120 for selecting the end socket form of C type independent liquid cargo tank, and end socket form comprises dome head and dished end.Flow container shape due to C type independent liquid cargo tank might not be the cylindrical shape or spherical of rule, by selecting different end socket forms, calculation of pressure module 130, plate seam divides and face area computing module 150 can adopt different corresponding modes and method to carry out calculating and the division of plate seam.
Calculation of pressure module 130 is for calculating the design steam pressure of C type independent liquid cargo tank, fluid pressure and internal pressure.Wherein, steam pressure is that the Parameter Calculation being dependent on C type independent liquid cargo tank obtains; Fluid pressure is basic specification according to C type independent liquid cargo tank and end socket form calculus fluid pressure; Internal pressure is calculated by steam pressure and fluid pressure and draws.
If selection dome head, then the fluid pressure of end socket and shell portion calculates all to be chosen as and calculates according to the model of duplex cylindrical band dome head, and this part described in detail in the middle of embodiment 1, did not repeat them here.If selection dished end, then the automatic calculating by the fluid pressure of end socket and shell portion is all chosen as and calculates according to the model of duplex cylindrical band dished end.Wherein, the maximum liquid-column height Z of dished end
βcomputing Principle and dome head completely the same, just its end socket has radius of spherical crown and knuckle radius two kinds of radiuses, causes computing formula slightly different.
The division of plate seam and face area computing module 140 are for dividing according to the plate seam that carries out of end socket form to C type independent liquid cargo tank; And adopt the method for integration to calculate the face area of C type independent liquid cargo tank: in the present embodiment, according to the shape and structure of the C type independent liquid cargo tank of reality, plate seam is carried out to it and divides; To fitfull plate, adopt unified polar coordinate system, calculated the area of fitfull plate by the method for integration; For the plate of rule, then use its area of areal calculation formulae discovery of standard; Finally, the area of all plates is added the face area that can obtain C type independent liquid cargo tank.
Case weight computing module 150 is for calculating the minimum thickness of slab of housing according to internal pressure; And calculating case weight according to the face area of the minimum thickness of slab of housing and X-type independent liquid cargo tank: case weight equals face area and is multiplied by the density that the minimum thickness of slab of housing is multiplied by housing again.
Cargo tank Weight computation module 160 is for according to case weight and annex, calculate the weight of C type independent liquid cargo tank: the weight of the annexes such as ring stiffener, vacuum ring, centerline bulkhead both can directly have been inputted by parameter input module 110, also can calculate the structure size of annex according to the method for finite element, thus calculate the weight obtaining annex.So, the formation weight of the non-housing parts of C type independent liquid cargo tank can be obtained further, ensure that the accuracy of C type independent liquid cargo tank weight estimation.
Output module 170 is for exporting the face area of C type independent liquid cargo tank, minimum thickness of slab, density of material and weight, and its inputting interface as shown in figure 11.
It should be noted that, the diagram provided in the present embodiment only illustrates basic conception of the present invention in a schematic way, then only the assembly relevant with the present invention is shown in graphic but not component count, shape and size when implementing according to reality is drawn, it is actual when implementing, and the kenel of each assembly, quantity and ratio can be a kind of change arbitrarily, and its assembly layout kenel also may be more complicated.
Be not difficult to find, the present embodiment is system embodiment corresponding to those in the first embodiment, and the present embodiment can be worked in coordination with the first embodiment and be implemented.The relevant technical details mentioned in first embodiment is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in the present embodiment also can be applicable in the first embodiment.
In sum, the computation method for hot of C type independent liquid cargo tank of the present invention and system, can according to the basic specification of the cargo tank of input, calculate the plate area of cargo tank and meet the minimum thickness of code requirement, final calculating obtains the total weight of cargo tank, for liquefied gas carrier early stage contract design quick response provide design considerations.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (10)
1. a computation method for hot for C type independent liquid cargo tank, is applied to the design of liquefied gas carrier, it is characterized in that, the computation method for hot of described C type independent liquid cargo tank comprises:
Step one, the steam pressure P of C type independent liquid cargo tank according to the Parameter Calculation of described C type independent liquid cargo tank
0with fluid pressure P
gd;
Step 2, according to described steam pressure P
0with described fluid pressure P
gdcalculate the internal pressure P of described C type independent liquid cargo tank
eq, and according to described internal pressure P
eqcalculate the minimum thickness of slab t of housing of described C type independent liquid cargo tank;
Step 3, carries out plate seam to the cylindrical shell of described C type independent liquid cargo tank and end socket and divides, obtain multiple plate; Adopt the method for integration to ask for the face area of multiple described plate, thus obtain the face area S of whole described C type independent liquid cargo tank;
Step 4, obtains the case weight W of described C type independent liquid cargo tank according to face area S, the described housing minimum thickness of slab t of described C type independent liquid cargo tank and described Parameter Calculation
0;
Step 5, calculates the weight W ' of the annex of described C type independent liquid cargo tank, thus obtains the weight W of described C type independent liquid cargo tank: the weight W of described C type independent liquid cargo tank equals described case weight W
0add the weight W ' of described annex.
2. the computation method for hot of C type independent liquid cargo tank according to claim 1, is characterized in that: the described basic specification of described C type independent liquid cargo tank comprises: to the actual waterline of the fore-and-aft distance between the described C type independent liquid cargo tank center of gravity of loading, boats and ships to the radius r of the vertical distance between the described C type independent liquid cargo tank center of gravity of loading, the density p of manufactured materials of described C type independent liquid cargo tank, length l, the width b of described C type independent liquid cargo tank, highly h and shell portion in commercial speed, structure captain, molded breadth, block coefficient, ship.
3. the computation method for hot of C type independent liquid cargo tank according to claim 2, is characterized in that: in described step one, described steam pressure P
0be greater than the operation pressure of described C type independent liquid cargo tank; And described steam pressure P
0for: P
0=0.2+0.1AC (ρ
r)
1.5; Wherein, A=0.0185 (σ
m/ Δ σ
a)
2, σ
mrepresent main membrane stress, Δ σ
arepresent Dynamic Membrane stress allowable; C represents the characteristic dimension of described C type independent liquid cargo tank, and C=max (0.75b, 0.75l); ρ
rrepresent the relative density of goods, ρ
rwith temperature correlation.
4. the computation method for hot of C type independent liquid cargo tank according to claim 3, is characterized in that: in described step one, described fluid pressure P
gdfor:
wherein, β represents the direction of spot pressure; α
βrepresent the non-dimensional acceleration that β direction is caused by gravity and live load; Z
βrepresent spot pressure along β direction upwards to the maximum liquid-column height of the coverboard of described C type cargo tank, and described maximum liquid-column height Z
βrelevant to the end socket form of described C type independent liquid cargo tank.
5. the computation method for hot of C type independent liquid cargo tank according to claim 4, is characterized in that: the described end socket form of described C type independent liquid cargo tank comprises dome head and dished end.
6. the computation method for hot of C type independent liquid cargo tank according to claim 5, is characterized in that: the described internal pressure P of described C type independent liquid cargo tank
eqfor: P
eq=P
0+ (P
gd)
max.
7. the computation method for hot of C type independent liquid cargo tank according to claim 1, is characterized in that: the described annex of described C type independent liquid cargo tank comprises ring stiffener, vacuum ring and centerline bulkhead; Calculated the size of described annex by the method for finite element, thus obtain the weight W ' of described annex.
8. the Weight computation system of a C type independent liquid cargo tank, be applied to the design of liquefied gas carrier, it is characterized in that: the Weight computation system of described C type independent liquid cargo tank comprises parameter input module, end socket selects module, calculation of pressure module, plate seam to divide and face area computing module, case weight computing module, cargo tank Weight computation module and output module; Wherein
Described parameter input module is for the annex of the basic specification and described C type independent liquid cargo tank that input described C type independent liquid cargo tank;
Described end socket selects module for selecting the end socket form of described C type independent liquid cargo tank;
Described calculation of pressure module is used for according to described basic specification and described end socket form calculus steam pressure, fluid pressure and internal pressure;
Described plate seam divides and face area computing module is used for dividing according to the plate seam that carries out of described end socket form to described C type independent liquid cargo tank; And adopt the method for integration to calculate the face area of described C type independent liquid cargo tank;
Described case weight computing module is used for calculating the minimum thickness of slab of housing according to described internal pressure; And calculate case weight according to the minimum thickness of slab of described housing and described face area;
Described cargo tank Weight computation module is used for the weight calculating described C type independent liquid cargo tank according to described case weight and described annex;
Described output module is for exporting the face area of described C type independent liquid cargo tank, minimum thickness of slab, density of material and weight.
9. the Weight computation system of C type independent liquid cargo tank according to claim 8, is characterized in that: described basic specification comprises: to the actual waterline of the fore-and-aft distance between the described C type independent liquid cargo tank center of gravity of loading, boats and ships to the radius r of the vertical distance between the described C type independent liquid cargo tank center of gravity of loading, the density p of manufactured materials of described C type independent liquid cargo tank, length l, the width b of described C type independent liquid cargo tank, highly h and shell portion in commercial speed, structure captain, molded breadth, block coefficient, ship.
10. the Weight computation system of C type independent liquid cargo tank according to claim 8, is characterized in that: described end socket form comprises dome head and dished end.
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| CN107895098A (en) * | 2017-12-29 | 2018-04-10 | 上海理工大学 | A kind of parabola circular arc end enclosure structure Optimization Design |
| CN107933822A (en) * | 2017-11-17 | 2018-04-20 | 中国舰船研究设计中心 | A kind of ship weight genesis analysis density of load computational methods |
| CN108153992A (en) * | 2018-01-17 | 2018-06-12 | 江南造船(集团)有限责任公司 | Modeling method, system, storage medium and the electronic equipment of cargo tank |
| CN109079437A (en) * | 2018-08-17 | 2018-12-25 | 江苏华滋海洋工程有限公司 | Large size liquefied gas storage multilayer limb end socket arrangement and method for construction peculiar to vessel |
| CN110356512A (en) * | 2019-07-22 | 2019-10-22 | 浙江新乐造船股份有限公司 | A kind of liquefied natural gas boat-carrying binary storage tank and its manufacturing method |
| CN114379726A (en) * | 2020-10-21 | 2022-04-22 | 中国石油天然气集团有限公司 | Method, device, equipment and storage medium for determining empty weight of ship |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107933822A (en) * | 2017-11-17 | 2018-04-20 | 中国舰船研究设计中心 | A kind of ship weight genesis analysis density of load computational methods |
| CN107895098A (en) * | 2017-12-29 | 2018-04-10 | 上海理工大学 | A kind of parabola circular arc end enclosure structure Optimization Design |
| CN107895098B (en) * | 2017-12-29 | 2021-03-26 | 上海理工大学 | Optimization design method for parabolic-arc-shaped end socket structure |
| CN108153992A (en) * | 2018-01-17 | 2018-06-12 | 江南造船(集团)有限责任公司 | Modeling method, system, storage medium and the electronic equipment of cargo tank |
| CN108153992B (en) * | 2018-01-17 | 2021-08-06 | 江南造船(集团)有限责任公司 | Modeling method and system of liquid cargo tank, storage medium and electronic equipment |
| CN109079437A (en) * | 2018-08-17 | 2018-12-25 | 江苏华滋海洋工程有限公司 | Large size liquefied gas storage multilayer limb end socket arrangement and method for construction peculiar to vessel |
| CN110356512A (en) * | 2019-07-22 | 2019-10-22 | 浙江新乐造船股份有限公司 | A kind of liquefied natural gas boat-carrying binary storage tank and its manufacturing method |
| CN114379726A (en) * | 2020-10-21 | 2022-04-22 | 中国石油天然气集团有限公司 | Method, device, equipment and storage medium for determining empty weight of ship |
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