CN104494782A - Container ship three-cargo hold finite element analysis method based on coupling working conditions - Google Patents
Container ship three-cargo hold finite element analysis method based on coupling working conditions Download PDFInfo
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- CN104494782A CN104494782A CN201410727719.5A CN201410727719A CN104494782A CN 104494782 A CN104494782 A CN 104494782A CN 201410727719 A CN201410727719 A CN 201410727719A CN 104494782 A CN104494782 A CN 104494782A
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Abstract
The invention discloses a container ship three-cargo hold finite element analysis method based on coupling working conditions. The method comprises two steps of working condition classification and working condition finite element analysis. In the working condition classification, left and right oil holds are arranged between transverse bulkheads, and extreme working conditions which possibly occur are that both the oil holds are full, both the oil holds are empty and one oil hold is full and the other oil hold is empty. The oil holds which are both full are helpful for positive floating, heeling and trimming states of a container ship; if one oil hold is full and the other oil hold is empty, watertight vertical web structures in the oil holds are mainly checked; when both the oil holds are empty, the structures become more dangerous in the damage state. The invention provides a more comprehensive cargo hold area three-cargo hold finite element analysis working condition setting method involving oil holds, obtains the approval of classification society, effectively guarantees the reliability of finite element strength estimation, reduces the number of mechanically combined working conditions, and improves the working efficiency.
Description
Technical field
The present invention relates to box ship three cabin section finite element method, in particular, relate to and be arranged on intermediate bulk container ship between cargo hold for cargo tank, in its three cabins section finite element analysis process, the improvement of operating condition design.The present invention is only arranged in the medium-sized & pint-sized container vessel between the transcerse bulkhead of cargo hold for fuel oil tank.
Background technology
For reducing free surface to the impact of Stability of Ship, medium-sized & pint-sized container vessel due to cabin space limited, usually no longer arrange independent fuel oil tank, and between transcerse bulkhead fuel oil tank being arranged in cargo hold, as shown in Figure 1.In the freight container finite element analysis of routine, cargo hold and cargo tank normally separate check.Have 7 typical conditions in usual cargo hold three cabin section finite element analysis, cargo tank analysis has 3 typical conditions.Because fuel oil tank is arranged between cargo hold transcerse bulkhead, namely fuel oil tank structure is exactly a part for cargo component.If still traditionally separate check two parts, then the effect of intercoupling of fuel oil tank and cargo hold load cannot be counted check scope to the impact of structure, the operating mode arranged respectively cannot contain typical hazard operating modes all in shipping transport, and structure may be partial to danger.
In addition, finite element method is the known method of state of the art, as document " design of container ship cargo hold plot structure and strength assessment research " (author Jiang Qiao etc., " ocean engineering ", date: 2009-08-15), disclose relevant finite element method, specific analytical method of the present invention can select the finite element method as document and other prior aries.Improvement of the present invention is the selection of operating mode.
Summary of the invention
The present invention is directed to the problems referred to above, distinguish the composition basis of analysing operating mode setting adding fuel oil tank load at the cargo hold of routine, redesign the operating mode group of cabin, the cargo hold district three section finite element analysis of a set of fusion fuel oil tank typical condition.The method that the present invention can provide cabin, the cargo hold district three section finite element analysis operating mode comparatively comprehensively merging fuel oil tank to arrange, obtain the accreditation of classification society, effectively ensure that the reliability that finite element strength is assessed, decrease the operating mode quantity of mechanicalness combination, improve work efficiency.The present invention is only arranged in the medium-sized & pint-sized container vessel between the transcerse bulkhead of cargo hold for fuel oil tank.
In order to achieve the above object, a kind of box ship three cabin section finite element method based on coupling operating mode of the present invention, comprises two steps of producing condition classification and operating mode finite element analysis.Improvement of the present invention is, the medium-sized & pint-sized container vessel (merging the cargo hold district three cabin section of fuel oil tank) between the transcerse bulkhead being arranged in cargo hold for fuel oil tank, and described producing condition classification step is as follows:
LC1a hogging is top-uped operating mode: boats and ships are just bubbled through the water column, and absorbs water for scantling draft superposition waviness height; In cabin within the scope of cargo hold between fuel oil tank bay and more than hatch cover be empty, without container load; Other all bay (comprising in cabin and more than hatch cover) fill 40 chi freight containers of maximum oxed weight; Under empty bay, ballast water filled by corresponding ballast chamber; Fuel oil filled by cargo hold two ends fuel oil tank.
LC1b1 hogging is top-uped operating mode: boats and ships are just bubbled through the water column, and absorbs water for scantling draft superposition waviness height; Be empty in cabin within the scope of cargo hold between fuel oil tank bay, without container load; Other all bay fill (comprising in cabin and more than whole hatch cover) 40 chi freight containers of maximum gross; Ballast-free; Fuel oil filled by cargo hold two ends fuel oil tank.
LC1b2 hogging is top-uped operating mode: boats and ships are just bubbled through the water column, and absorbs water for scantling draft superposition waviness height; Be empty in cabin within the scope of cargo hold between fuel oil tank bay, without container load; Other all bay fill (comprising in cabin and more than whole hatch cover) 40 chi freight containers of maximum gross; Ballast-free; The left cabin of fuel oil tank, cargo hold two ends is empty, and fuel oil is filled in right cabin.
Vertical operating mode of top-uping in LC1c: boats and ships are just bubbled through the water column, absorbs water for scantling draft superposition trough height; 20 chi freight containers of maximum oxed weight are filled in all cabins and more than hatch cover; Ballast-free; Fuel oil filled by cargo hold two ends fuel oil tank.
LC2a hogging heel operating mode: boats and ships heel is to maximum angle, and Mean Draft equals scantling draft; Maximum heeling angle is 30 ° and 2tan
-1(D-T
ssmaller value in)/B; Without wave load; In cabin within the scope of cargo hold between fuel oil tank bay and more than hatch cover be empty, without container load; Other all bay (comprising in cabin and more than hatch cover) fill 40 chi freight containers of maximum oxed weight; Ballast-free; Fuel oil filled by cargo hold two ends fuel oil tank.
Vertical heel operating mode in LC2b1: boats and ships heel is to maximum angle, and Mean Draft equals scantling draft; Maximum heeling angle is 30 ° and 2tan
-1(D-T
ssmaller value in)/B; Without wave load; 20 chi freight containers of maximum oxed weight are filled in all cabins and more than hatch cover; ; Ballast-free; Fuel oil filled by cargo hold two ends fuel oil tank.
Vertical heel operating mode in LC2b2; Boats and ships heel is to maximum angle, and Mean Draft equals scantling draft; Maximum heeling angle is 30 ° and 2tan
-1(D-T
ssmaller value in)/B; Without wave load; 20 chi freight containers of maximum oxed weight are filled in all cabins and more than hatch cover; Ballast-free; The left cabin of fuel oil tank, cargo hold two ends is empty, and fuel oil is filled in right cabin.
LC3 trim operating mode: during oceangoing ship surging, longitudinal acceleration causes longitudinal loading, load 40 chi casees of maximum oxed weight in cabin; More than hatch cover load 20 chi casees of maximum oxed weight; Fuel oil filled by cargo hold two ends fuel oil tank.
LC4a damage operating mode: boats and ships are just bubbled through the water column, absorbs water for scantling draft; Without wave load; Cargo hold water inlet between fuel oil tank, in water inlet cabin, transcerse bulkhead hydraulic pressure height gets the above 0.9m of freeboard, but is not less than the moldeed depth height of 0.8 times; Longitudinal bulkhead hydraulic pressure height gets scantling draft; On the hatch cover that water inlet cargo hold is corresponding, without container load; Other regions comprise in cabin and more than hatch cover fills 40 heavy chi casees of maximum case; Fuel oil tank is entirely empty
LC4b damage operating mode: boats and ships are just bubbled through the water column, absorbs water for scantling draft; Cargo hold water inlet between fuel oil tank, in water inlet cabin, transcerse bulkhead hydraulic pressure height gets the above 0.9m of freeboard, but is not less than the moldeed depth height of 0.8 times; Longitudinal bulkhead hydraulic pressure height gets scantling draft; Water inlet cargo hold is without container load; Other regions comprise in cabin and more than all hatch covers fills 40 heavy chi casees of maximum case; Fuel oil tank is entirely empty.
The method that the present invention can provide cabin, the cargo hold district three section finite element analysis operating mode comparatively comprehensively merging fuel oil tank to arrange, obtain the accreditation of classification society, effectively ensure that the reliability that finite element strength is assessed, decrease the operating mode quantity of mechanicalness combination, improve work efficiency.The present invention is only arranged in the medium-sized & pint-sized container vessel between the transcerse bulkhead of cargo hold for fuel oil tank.
Accompanying drawing explanation
Fig. 1 is the longitudinal arrangement plan of box ship that fuel oil tank is arranged between cargo hold transcerse bulkhead.
Fig. 2 is the loaded-up condition schematic diagram of LC1a operating mode in literary composition.
Fig. 2-1 be in Fig. 2 A-A to the structural representation of loading condition.
Fig. 3 is LC1b1 loaded-up condition.
Fig. 3-1 be in Fig. 3 A-A to the structural representation of loading condition.
Fig. 4 is LC1b2 device situation.
Fig. 4-1 be in Fig. 4 A-A to the structural representation of loading condition.
Fig. 5 is LC1c loaded-up condition.
Fig. 5-1 be in Fig. 5 A-A to the structural representation of loading condition.
Fig. 6 is LC2a loaded-up condition.
Fig. 6-1 be in Fig. 6 A-A to the structural representation of loading condition.
Fig. 7 is LC2b1 loaded-up condition.
Fig. 7-1 be in Fig. 7 A-A to the structural representation of loading condition.
Fig. 8 is LC2b2 loaded-up condition.
Fig. 8-1 be in Fig. 8 A-A to the structural representation of loading condition.
Fig. 9 is LC3 loaded-up condition.
Fig. 9-1 be in Fig. 9 A-A to the structural representation of loading condition.
Figure 10 is LC4a loaded-up condition.
Figure 11 is LC4b loaded-up condition.
Figure 10-1 be in Figure 10, Figure 11 A-A to the structural representation of loading condition.
Detailed description of the invention
In figure of the present invention, modeling scope 99 of the present invention is: be longitudinally ship midship cargo area, comprising: 1/2 cargo hold+1 cargo tank+1 cargo hold+1 cargo tank+1/2 cargo hold, vertical is moldeed depth; Laterally get the beam.Model comprises four road watertight bulkheads, three road holding bulkheads, and holding bulkhead is positioned in the middle of model and two ends.
For certain box ship, 10 operating modes are set altogether, wherein upright condition 4 (LC1a, LC1b1, LC1b2, LC1c), heel state 3, trimming condition 1, damage state 2.Concrete operating mode arranges as follows:
1, to top-up operating mode
LC1a hogging, as shown in Fig. 2 and Fig. 2-1:
still water load: scantling draft 1;
wave load: crest 2;
ballast water load 3 between double bottom;
sky in a bay in cabin and more than hatch cover, without container load 4;
the 40ft case allowing maximum oxed weight is filled in all the other cabins and more than hatch cover;
fuel oil 5 filled by cargo hold two ends fuel oil tank.
LC1b1 hogging, as shown in Fig. 3 and Fig. 3-1:
still water load: scantling draft 1;
wave load: crest 2;
empty within the scope of a bay in cabin, without container load 4;
the 40ft case allowing maximum oxed weight is filled in all the other cabins and more than hatch cover;
fuel oil 5 filled by cargo hold two ends fuel oil tank.
LC1b2 hogging, as shown in Fig. 4 and Fig. 4-1, divided by next all the other identical with 1b1 operating mode:
an empty cabin, fuel oil tank one cabin, cargo hold two ends full (Fig. 4-1).
Hang down in LC1c, as shown in Fig. 5 and Fig. 5-1:
still water load: scantling draft 1;
wave load: trough 6;
the 20ft freight container of maximum oxed weight is filled in all cabins and more than hatch cover;
fuel oil 5 filled by cargo hold two ends fuel oil tank.
2, heel operating mode
LC2a hogging, as shown in Fig. 6 and Fig. 6-1, except following several, all the other are identical with LC1a
mean Draft equals scantling draft 1;
ballast-free;
static heeling angle gets 30 ° and 2tan
-1(D-T
ssmaller value 7 in)/B;
D-moldeed depth
T
s-scantling draft
B-molded breadth
without wave load;
fuel oil 5 filled by cargo hold two ends fuel oil tank.
Hang down in LC2b1, as shown in Fig. 7 and Fig. 7-1, except following several, all the other are identical with LC1c
mean Draft equals scantling draft 1;
ballast-free;
static heeling angle gets 30 ° and 2tan
-1(D-T
ssmaller value 7 in)/B;
without wave load;
fuel oil 5 filled by cargo hold two ends fuel oil tank.
Hang down in LC2b2, as shown in Fig. 8 and Fig. 8-1, divided by next, all the other are identical with LC2b1
an empty cabin, fuel oil tank one cabin, cargo hold two ends full (see Fig. 8-1);
3, trim operating mode
The setting of LC3 trim operating mode as shown in Fig. 9 and Fig. 9-1 is used for examining or check the Cross deck structure on transcerse bulkhead and holding bulkhead.
because trim produces 40ft case longitudinal loading in cabin;
due to the heavy longitudinal loading of the maximum case of the above 20ft of hatch cover that trim produces;
fuel oil 5 filled by cargo hold two ends fuel oil tank.
4, damage operating mode
LC4a is as shown in Figure 10 and Figure 10-1
still water load: scantling draft 1;
cargo hold water inlet 8;
the above 0.91m of freeboard is got to transcerse bulkhead hydraulic pressure height, but is not less than 0.8D (D is moldeed depth);
scantling draft is got for longitudinal bulkhead hydraulic pressure height;
without container load 4 on hatch cover;
the heavy 40ft case of maximum case filled by cargo hold of not intaking;
fuel oil tank sky (see Figure 10-1).
LC4b as shown in figure 11, divided by next all the other identical with 4a:
more than hatch cover fill the 40ft case that maximum case is heavy.
Cargo tank under normal circumstances between transcerse bulkhead is set to two cabins, left and right.The extreme operating condition that may occur is full up, full sky, an empty cabin, a cabin is expired.Fuel oil tank is full up to top-up to box ship, heel, trimming condition are contributed to some extent; Watertight vertical purlin structure in cargo tank is completely mainly examined in an empty cabin, one cabin; Full sky then makes structure more relatively dangerous in damage state.Based on above consideration, the cargo hold of routine is distinguished the operating mode analysed and superposes as follows:
1). hogging of top-uping operating mode 1a superposes full cargo tank load, as shown in Figure 2;
2). hogging of top-uping operating mode 1b1 superposes full cargo tank load, as shown in Figure 3;
3). hogging of top-uping operating mode 1b2 superposes a cabin empty and hides full cargo tank load, as shown in Figure 4;
4). the full cargo tank load of operating mode 1c superposition of hanging down in top-uping, as shown in Figure 5;
5). heel operating mode 2a superposes full cargo tank load, as shown in Figure 6;
6). heel operating mode 2b1 superposes full cargo tank load, as shown in Figure 7;
7). heel operating mode 2b2 superposes the full cargo tank load in an empty cabin, a cabin, as shown in Figure 8;
8). trim operating mode 3a superposes full cargo tank load, as shown in Figure 9;
9). damage operating mode 4a, fuel oil tank is empty, as shown in Figure 10
10). damage operating mode 4b, fuel oil tank is empty, as shown in figure 11.
The invention discloses a kind of method that cargo tank is arranged on the finite element analysis operating mode setting of the intermediate bulk container ship three cabin section between cargo hold.According to the structure bearing load feature that box ship fuel oil tank and cargo hold are runed, on model.Thus make design conditions contain typical hazard operating modes all in shipping transport, meet classification society's requirement.
The finite element method of the present invention after producing condition classification is the known method of state of the art, as document " design of container ship cargo hold plot structure and strength assessment research " (author Jiang Qiao etc., " ocean engineering ", date: 2009-08-15), disclose relevant finite element method, specific analytical method of the present invention can select the finite element method as document and other prior aries.Improvement of the present invention is the selection of operating mode.
The above; be only the present invention's preferably detailed description of the invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.
Claims (1)
1. the box ship three cabin section finite element method based on coupling operating mode, comprise two steps of producing condition classification and operating mode finite element analysis, it is characterized in that, the medium-sized & pint-sized container vessel between the transcerse bulkhead being arranged in cargo hold for fuel oil tank, described producing condition classification step is as follows:
LC1a hogging is top-uped operating mode: boats and ships are just bubbled through the water column, and absorbs water for scantling draft superposition waviness height; In cabin within the scope of cargo hold between fuel oil tank bay and more than hatch cover be empty, without container load; Other all bay fill 40 chi freight containers of maximum oxed weight; Under empty bay, ballast water filled by corresponding ballast chamber; Fuel oil filled by cargo hold two ends fuel oil tank;
LC1b1 hogging is top-uped operating mode: boats and ships are just bubbled through the water column, and absorbs water for scantling draft superposition waviness height; Be empty in cabin within the scope of cargo hold between fuel oil tank bay, without container load; Other all bay fill 40 chi freight containers of maximum gross; Ballast-free; Fuel oil filled by cargo hold two ends fuel oil tank;
LC1b2 hogging is top-uped operating mode: boats and ships are just bubbled through the water column, and absorbs water for scantling draft superposition waviness height; Be empty in cabin within the scope of cargo hold between fuel oil tank bay, without container load; Other all bay fill 40 chi freight containers of maximum gross; Ballast-free; The left cabin of fuel oil tank, cargo hold two ends is empty, and fuel oil is filled in right cabin.Vertical operating mode of top-uping in LC1c: boats and ships are just bubbled through the water column, absorbs water for scantling draft superposition trough height; 20 chi freight containers of maximum oxed weight are filled in all cabins and more than hatch cover; Ballast-free; Fuel oil filled by cargo hold two ends fuel oil tank;
LC2a hogging heel operating mode: boats and ships heel is to maximum angle, and Mean Draft equals scantling draft; Maximum heeling angle is 30 ° and 2tan
-1(D-T
ssmaller value in)/B; Without wave load; In cabin within the scope of cargo hold between fuel oil tank bay and more than hatch cover be empty, without container load; Other all bay fill 40 chi freight containers of maximum oxed weight; Ballast-free; Fuel oil filled by cargo hold two ends fuel oil tank;
Vertical heel operating mode in LC2b1: boats and ships heel is to maximum angle, and Mean Draft equals scantling draft; Maximum heeling angle is 30 ° and 2tan
-1(D-T
ssmaller value in)/B; Without wave load; 20 chi freight containers of maximum oxed weight are filled in all cabins and more than hatch cover; Ballast-free; Fuel oil filled by cargo hold two ends fuel oil tank;
Vertical heel operating mode in LC2b2; Boats and ships heel is to maximum angle, and Mean Draft equals scantling draft; Maximum heeling angle is 30 ° and 2tan
-1(D-T
ssmaller value in)/B; Without wave load; 20 chi freight containers of maximum oxed weight are filled in all cabins and more than hatch cover; Ballast-free; The left cabin of fuel oil tank, cargo hold two ends is empty, and fuel oil is filled in right cabin;
LC3 trim operating mode: during ship surging, longitudinal acceleration causes longitudinal loading, loads 40 chi casees of maximum oxed weight in cabin; More than hatch cover load 20 chi casees of maximum oxed weight; Fuel oil filled by cargo hold two ends fuel oil tank;
LC4a damage operating mode: boats and ships are just bubbled through the water column, absorbs water for scantling draft; Cargo hold water inlet between fuel oil tank, in water inlet cabin, transcerse bulkhead hydraulic pressure height gets the above 0.9m of freeboard, but is not less than the moldeed depth height of 0.8 times; Longitudinal bulkhead hydraulic pressure height gets scantling draft; Without container load on the hatch cover that water inlet cargo hold is corresponding; Other regions comprise in cabin and more than hatch cover fills 40 heavy chi casees of maximum case; Fuel oil tank is entirely empty;
LC4b damage operating mode: boats and ships are just bubbled through the water column, absorbs water for scantling draft; Cargo hold water inlet between fuel oil tank, in water inlet cabin, transcerse bulkhead hydraulic pressure height gets the above 0.9m of freeboard, but is not less than the moldeed depth height of 0.8 times; Longitudinal bulkhead hydraulic pressure height gets scantling draft; Water inlet cargo hold is without container load; Other regions comprise in cabin and more than all hatch covers fills 40 heavy chi casees of maximum case; Fuel oil tank is entirely empty.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112528422A (en) * | 2021-01-11 | 2021-03-19 | 招商局邮轮制造有限公司 | Vibration forecasting and analyzing method for ship residential area |
| CN113788122A (en) * | 2021-10-28 | 2021-12-14 | 江南造船(集团)有限责任公司 | Finite element analysis pretreatment method for container ship body |
| CN114084288A (en) * | 2021-09-02 | 2022-02-25 | 中集船舶海洋工程设计研究院有限公司 | Container ship |
| CN115123481A (en) * | 2022-08-22 | 2022-09-30 | 江南造船(集团)有限责任公司 | Cargo hold collaborative arrangement method and ship |
| CN118657034A (en) * | 2024-08-22 | 2024-09-17 | 南通中远海运川崎船舶工程有限公司 | Method for evaluating strength of methanol cabin on green ship deck based on FEM |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115123481A (en) * | 2022-08-22 | 2022-09-30 | 江南造船(集团)有限责任公司 | Cargo hold collaborative arrangement method and ship |
| CN118657034A (en) * | 2024-08-22 | 2024-09-17 | 南通中远海运川崎船舶工程有限公司 | Method for evaluating strength of methanol cabin on green ship deck based on FEM |
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