CN101710354A - Shape optimizing method for cylinder sleeve of slow-speed diesel - Google Patents
Shape optimizing method for cylinder sleeve of slow-speed diesel Download PDFInfo
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- CN101710354A CN101710354A CN 200910200560 CN200910200560A CN101710354A CN 101710354 A CN101710354 A CN 101710354A CN 200910200560 CN200910200560 CN 200910200560 CN 200910200560 A CN200910200560 A CN 200910200560A CN 101710354 A CN101710354 A CN 101710354A
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Abstract
The invention relates to a shape optimizing method for cylinder sleeve of slow-speed diesel, comprising the following steps: firstly, establishing a CAD three-dimensional parametrization model of a cylinder body so as to form a parametrization data model for carrying out the finite element simulation analysis; secondly, carrying out the structure kinematic analysis on a cylinder sleeve subassembly of a piston, and determining the lateral impact applied on the cylinder sleeve by the piston; thirdly, parametrizing the key size of the cylinder sleeve, carrying out the finite element analysis on the cylinder sleeve structure, and carrying out the structure optimization design on the wall thickness of the cylinder sleeve; finally, carrying out the analysis verification on the model after being optimized so as to obtain the CAE data result and form a final cylinder sleeve optimization simulation design flow and a model database file. The original design is modified by using the method of the invention so that a more reasonable geometrical shape of the cylinder sleeve is obtained, thereby effectively reducing the weight of the cylinder sleeve and saving the material and casting cost.
Description
Technical field
The invention belongs to mechanical design field, relate to the cylinder liner construction Shape optimization designs, particularly relate to the Shape optimization designs method of high-power marine low speed diesel engine cylinder jacket.
Background technology
Cylinder jacket is embedded in the cylinder block, constitutes the working cycle space of diesel engine jointly with cylinder head, piston set, its shape be one press in bearing and the temperature stress influence do not wait the wall thickness cylinder.The structure of cylinder jacket as shown in Figure 2, Fig. 2 is the present invention carries out the method Central Plains cylinder jacket of Shape optimization to the low-speed diesel engine cylinder jacket a structural representation.In working process of diesel engine, the repeated stock effect the when inside surface of cylinder jacket directly is subjected to the high-temperature high-pressure fuel gas burning, outside surface is subjected to washing away of chilled water directly or indirectly and cools off; In intake process, be subjected to entering brushing of air again.Owing to have the fluctuation of temperature and pressure, there are temperature difference and cylinder jacket to be subjected to making cylinder jacket bear sizable mechanical stress and thermal stress under the effect of bigger erection stress etc. between inside and outside wall at cylinder liner internal wall.
In addition, cylinder jacket play the guiding role to the to-and-fro movement of piston set again, and piston ring packing pressure, friction force and side thrust of piston act directly on the interior surface of cylinder liner, makes cylinder jacket produce bending stress and wearing and tearing.Interior surface of cylinder liner is subjected to the chemical corrosion of combustion gas, and outside surface is subjected to chemistry, galvanochemistry and the cavitation of chilled water, and corrosion and cavitation pitting take place easily.
Therefore, in order to guarantee the cylinder sleeve reliability of structure and improve serviceable life need guarantee when structural design that cylinder is with enough intensity and certain rigidity, and body structure surface to possess certain precision, smooth finish and resistance to corrosion.
Find that by technology retrieval the geometric configuration of existing cylinder liner construction design is relatively simple, on the one hand, relevant with early stage mentality of designing and the design means taked; On the other hand, neither be fully need design, be subjected to the restriction of manufacturing technology level at that time, make the partial design theory be difficult to realize fully according to structural strength and rigidity.
Along with the raising of development of computer and manufacturing technology level, complicated Modeling Technology is comparative maturity, can design as required fully structure more excellent, meet the cylinder jacket profile of requirement of strength more.
Summary of the invention
The Shape optimization designs method that the purpose of this invention is to provide a kind of high-power two-stroke low speed cylinder jacket of diesel engine, utilize method of the present invention that original design is made amendment, more rational cylinder jacket geometric shape of final acquisition, and reduced the weight of cylinder sleeve effectively, saved material and casting cost.
In order to reach the foregoing invention purpose, technical scheme provided by the invention is as follows:
A kind of method of the low-speed diesel engine cylinder jacket being carried out Shape optimization, this method is earlier to carrying out finite element analysis behind the shape modeling of intrinsic low-speed diesel engine cylinder jacket, according to analysis result parameter modification is carried out in original design, the more suitable cylinder jacket geometric shape of final acquisition.
Further, the present invention's method that the low-speed diesel engine cylinder jacket is carried out Shape optimization comprises following detailed step:
1. to the characteristic parameter and the characteristic extracting of existing low-speed diesel engine cylinder jacket,, set up the three-dimensional master pattern of cylinder jacket with the critical size parametrization of cylinder jacket;
2. the 1. described three-dimensional master pattern of step is converted into finite element analysis model, to the wall thickness parametrization of cylinder sleeve different parts;
3. the piston set in the cylinder sleeve is carried out kinematics analysis, determine the piston impact power that cylinder sleeve is subjected to;
4. the piston impact power that step is obtained in 3. puts on cylinder jacket, and cylinder jacket is carried out finite element analysis;
5. optimize the wall thickness of cylinder jacket, and the cylinder jacket behind the optimization wall thickness is carried out finite element analysis, check stress result;
6. preserve the optimization result of cylinder jacket, and this result is fed back to master pattern.
In the present invention, described step 3. in the computation process of the suffered impulsive force of cylinder jacket be:
Displacement:
Speed:
Acceleration: a=R ω
2(cos α+λ cos2 α)
P
N＝P?tan?β
P＝P
g+P
j
P
j＝-m
ja
β＝sin
-1(λsinα)
λ＝R/l
α＝ωt
In the formula, P
j-reciprocal inertia force; P
g-gaseous tension; The P-total force; P
N-piston action is in the power of cylinder jacket; m
jThe gross mass of-reciprocating piston component; The l-length of connecting rod; The R-crank length; α-crank angle; ω-crankshaft rotating angular velocity; β-connecting rod pivot angle; Try to achieve cylinder jacket and be subjected to the pressure P of bouncing of piston.
In the present invention, it is that permissible stress with the cylinder jacket constituent material is a constraint condition that described step is carried out finite element analysis to cylinder jacket in 4., and the thickness of cylinder sleeve is as parametric variable.
In the present invention, the 5. middle stress result of checking of described step is to adopt: carry out finite element analysis once more with revised cylinder liner construction, check that resulting stress value whether in 90% ± 2% scope of material permissible stress value, if then stop to optimize, otherwise continues to optimize.
In the present invention, the three-dimensional master pattern of setting up cylinder jacket adopts CAD software, sets up the limit element analysis model and adopts CAE software.
Based on technique scheme, the method that the present invention carries out Shape optimization to the low-speed diesel engine cylinder jacket has obtained following technique effect:
1. integrated use CAD of the present invention, CAE software, CAD part are mainly finished the three-dimensional modeling of cylinder jacket, and with the critical size parametrization, are beneficial to structure is made amendment and optimized; According to the loading characteristic of cylinder jacket, by computer-aided engineering CAE, cylinder liner construction is carried out mechanical analysis, finish fatigue life prediction and fail-safe analysis.
2. the stress result that obtains according to finite element analysis, wall thickness to cylinder jacket is made correction, increase the wall thickness of high stress areas cylinder sleeve, low stress zones reduces wall thickness in proportion, more rational cylinder jacket geometric shape of final acquisition, and reduced the weight of cylinder sleeve effectively, saved material and casting cost.
3. method of the present invention finally forms the optimal design normal process, and can realize the simulation optimization design to tandem product,
Description of drawings
Fig. 1 is the present invention carries out the method for Shape optimization to the low-speed diesel engine cylinder jacket a process chart.
Fig. 2 is the present invention carries out the method Central Plains cylinder jacket of Shape optimization to the low-speed diesel engine cylinder jacket a structural representation.
Fig. 3 is the present invention carries out the method Central Plains cylinder liner construction of Shape optimization to the low-speed diesel engine cylinder jacket finite element model figure.
Fig. 4 is that the present invention carries out the low-speed diesel engine cylinder jacket optimizing in the method for Shape optimization and improves design back structural finite element model figure.
Fig. 5 is the present invention carries out the method Central Plains cylinder liner construction of Shape optimization to the low-speed diesel engine cylinder jacket a stress result cloud atlas.
Fig. 6 is that the present invention carries out optimizing in the method for Shape optimization the stress result cloud atlas that improves design back structure to the low-speed diesel engine cylinder jacket.
Embodiment
Below we come the method that the present invention carries out Shape optimization to the low-speed diesel engine cylinder jacket done further with specific embodiment in conjunction with the accompanying drawings and elaborate, but can not limit protection scope of the present invention with this.
The present invention carries out carrying out on the basis of method synthesis utilization CAD, CAE software of Shape optimization the secondary development of finite element program to the low-speed diesel engine cylinder jacket, form the analysis of optimizing design software package, comprises two parts of CAD, CAE.CAD part is mainly finished the three-dimensional modeling of cylinder jacket, and with the critical size parametrization, is beneficial to structure is made amendment and optimized; According to the loading characteristic of cylinder jacket, by computer-aided engineering CAE, cylinder liner construction is carried out mechanical analysis, finish fatigue life prediction and fail-safe analysis.According to the stress result that finite element analysis obtains, the wall thickness of cylinder jacket is made correction.The final optimal design normal process that forms, and can realize the simulation optimization design to tandem product.Carry out according to the following steps:
Step 1: the three-dimensional model of setting up cylinder jacket
By analysis and research and characteristic extracting to typical two-stroke low speed cylinder jacket of diesel engine principal character parameter, on the CAD platform, carry out the Modeling Method of cylinder jacket, with cylinder jacket critical size parametrization, set up the three-dimensional modeling data storehouse.
Step 2: the finite element analysis model of setting up cylinder jacket
Solid model by the foundation of CAD platform, be converted into finite element model, wall thickness to the cylinder sleeve different parts carries out parametrization, so that cylinder sleeve is carried out structure optimization, the model of the finite element after the foundation as shown in Figure 3, Fig. 3 is the present invention carries out the method Central Plains cylinder liner construction of Shape optimization to the low-speed diesel engine cylinder jacket finite element model figure.
Step 3: the cylinder sleeve piston set is carried out kinematics analysis, determine the impulsive force that cylinder sleeve is subjected to
With reference to " diesel engine design manual " (Shi Shaoxi etc.), determine the size of the impulsive force that cylinder jacket is suffered.The piston motion rule adopts approximate formula to calculate:
Displacement:
Speed:
Acceleration: a=R ω
2(cos α+λ cos2 α)
P
N＝P?tan?β
P＝P
g+P
j
P
j＝-m
ja
β＝sin
-1(λsinα)
λ＝R/l
α＝ωt
In the formula, P
j-reciprocal inertia force; P
g-gaseous tension; The P-total force; P
N-piston action is in the power of cylinder jacket; m
jThe gross mass of-reciprocating piston component; The l-length of connecting rod; The R-crank length; α-crank angle; ω-crankshaft rotating angular velocity; β-connecting rod pivot angle.As calculated, try to achieve the pressure that bounces that cylinder jacket is subjected to piston.
Step 4: the piston impact power that obtains is put on cylinder jacket, cylinder sleeve is carried out finite element analysis
With calculate impulsive force put on inner surface of cylinder liner, calculate when piston runs to lower dead center, the transient impact that acts on the cylinder sleeve responds.And with the permissible stress of structure as constraint condition, cylinder sleeve thickness is as parametric variable, be optimized design, obtain optimum cylinder sleeve wall thickness, Fig. 5 and Fig. 6 are the stress result cloud atlas of cylinder liner construction before and after the present invention carries out the low-speed diesel engine cylinder jacket improving in the method for Shape optimization.
Step 5: the cylinder sleeve of having optimized wall thickness is carried out finite element analysis, check stress result
Revised structure is carried out finite element analysis again, and inspection result of calculation, if the gained stress value is during near the permissible stress of structure, stop to revise, whether the standard of above-mentioned permissible stress near structure is: in 90% ± 2% scope of material permissible stress value, amended cylinder jacket as shown in Figure 4, Fig. 4 is that the present invention carries out the low-speed diesel engine cylinder jacket optimizing in the method for Shape optimization and improves design back structural finite element model figure.
Step 6: will optimize the model that the result feeds back to the CAD platform, and set up and optimize database, and determine to optimize flow process to calculating
Preserve and optimize the result, and feed back to master pattern, and write the optimal design flow process of two-stroke low speed cylinder jacket of diesel engine, set up design specifications and database.
Embodiment 1
According to above optimal design flow process, the cylinder jacket of certain type high-power diesel engine is optimized design.In the present embodiment, the initial wall thickness of cylinder sleeve is 72mm, and mainly play the guiding role at the lower end cylinder sleeve, also can be subjected to the percussive action of piston simultaneously, and the requirement of strength of this part is not high, therefore, this part is optimized.
At first set up the finite element parameterized model of cylinder jacket, carry out the kinematic calculation analysis, obtain the impulsive force that cylinder sleeve is subjected to, then carry out the simulation analysis of shock response.Under the piston impact effect, to calculate to such an extent that the maximum VON Mises stress of original structure is 149MPa, maximum deformation quantity is 2.2mm; The cylinder jacket wall thickness is reduced to carry out shock Response Analysis again after the 22mm, and the maximum VON Mises stress of the back structure that is optimized is 167MPa, and maximum deformation quantity is 2.4mm.
As shown in table 1, the maximum stress of structure and deflection all rise to some extent after the wall thickness optimization, but all within allowed band, the weight of cylinder sleeve has reduced 101Kg, has saved material, has reduced the casting cost.Following table is the detailed contrast table that the low-speed diesel engine cylinder jacket is optimized each parameter of design back:
Every index comparative analysis before and after table 1 cylinder jacket is optimized
The present invention at first sets up the CAD 3D parameterized model of cylinder block, forms parameterized data model, is used for the finite element simulation analysis; Secondly, the piston-cylinder assembly is carried out the structural kinetics analysis, determine that cylinder sleeve is subjected to the lateral impact power of piston; Once more, with the critical size parametrization, cylinder liner construction is carried out finite element analysis, and the cylinder sleeve wall thickness is carried out Optimal Structure Designing; At last, the model after optimizing is carried out analysis verification, obtain the CAE data result, form final cylinder jacket optimization Simulation design cycle and model data library file.
Claims (6)
1. method of the low-speed diesel engine cylinder jacket being carried out Shape optimization, this method is earlier to carrying out finite element analysis behind the shape modeling of intrinsic low-speed diesel engine cylinder jacket, according to analysis result parameter modification is carried out in original design, the more suitable cylinder jacket geometric shape of final acquisition.
2. according to claim 1ly a kind of the low-speed diesel engine cylinder jacket is carried out the method for Shape optimization, it is characterized in that this method comprises following detailed step:
1. to the characteristic parameter and the characteristic extracting of existing low-speed diesel engine cylinder jacket,, set up the three-dimensional master pattern of cylinder jacket with the critical size parametrization of cylinder jacket;
2. the 1. described three-dimensional master pattern of step is converted into finite element analysis model, to the wall thickness parametrization of cylinder sleeve different parts;
3. the piston set in the cylinder sleeve is carried out kinematics analysis, determine the piston impact power that cylinder sleeve is subjected to;
4. the piston impact power that step is obtained in 3. puts on cylinder jacket, and cylinder jacket is carried out finite element analysis;
5. optimize the wall thickness of cylinder jacket, and the cylinder jacket behind the optimization wall thickness is carried out finite element analysis, check stress result;
6. preserve the optimization result of cylinder jacket, and this result is fed back to master pattern.
3. according to claim 2ly a kind of the low-speed diesel engine cylinder jacket is carried out the method for Shape optimization, it is characterized in that, described step 3. in the computation process of the suffered impulsive force of cylinder jacket be:
Displacement:
Speed:
Acceleration: a=R ω
2(cos α+λ cos2 α)
P
N＝Ptanβ
P＝P
g+P
j
P
j＝-m
ja
β＝sin
-1(λsinα)
λ＝R/l
α＝ωt
In the formula, P
j-reciprocal inertia force; P
g-gaseous tension; The P-total force; P
N-piston action is in the power of cylinder jacket; m
jThe gross mass of-reciprocating piston component; The l-length of connecting rod; The R-crank length; α-crank angle; ω-crankshaft rotating angular velocity; β-connecting rod pivot angle; Try to achieve cylinder jacket and be subjected to the pressure P of bouncing of piston.
4. a kind of method of the low-speed diesel engine cylinder jacket being carried out Shape optimization according to claim 2, it is characterized in that, it is that permissible stress with the cylinder jacket constituent material is a constraint condition that described step is carried out finite element analysis to cylinder jacket in 4., and the thickness of cylinder sleeve is as parametric variable.
5. a kind of method of the low-speed diesel engine cylinder jacket being carried out Shape optimization according to claim 2, it is characterized in that, the 5. middle stress result of checking of described step is to adopt: carry out finite element analysis once more with revised cylinder liner construction, check that resulting stress value is whether in 90% ± 2% scope of material permissible stress value, if then stop to optimize, otherwise continue to optimize.
6. according to claim 2ly a kind of the low-speed diesel engine cylinder jacket is carried out the method for Shape optimization, it is characterized in that the three-dimensional master pattern of setting up cylinder jacket adopts CAD software, set up the limit element analysis model and adopt CAE software.
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| CN 200910200560 CN101710354B (en) | 2009-12-23 | 2009-12-23 | Shape optimizing method for cylinder sleeve of slow-speed diesel |
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| CN101710354B CN101710354B (en) | 2012-12-12 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102184293A (en) * | 2011-05-11 | 2011-09-14 | 重庆长安汽车股份有限公司 | Method for designing spatial curved surface of piston skirt |
| CN104776821A (en) * | 2015-03-27 | 2015-07-15 | 中国北方发动机研究所(天津) | Dimension estimation method for high-power-density diesel engine for vehicle |
| CN108457763A (en) * | 2018-03-23 | 2018-08-28 | 浙江吉利控股集团有限公司 | A kind of air cylinder sleeve of engine |
| CN108694287A (en) * | 2018-05-25 | 2018-10-23 | 郑州飞机装备有限责任公司 | A method of solving start cylinder speed using simulation software |
| CN110993132A (en) * | 2019-12-05 | 2020-04-10 | 上海核工程研究设计院有限公司 | Transient monitoring method for supporting fatigue monitoring function of nuclear power plant |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003316828A (en) * | 2002-04-19 | 2003-11-07 | Toyoda Gosei Co Ltd | Structure optimization method |
| DE10324667A1 (en) * | 2003-05-30 | 2004-12-16 | STE Gesellschaft für Dichtungstechnik mbH | Cylinder head gasket |
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2009
- 2009-12-23 CN CN 200910200560 patent/CN101710354B/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102184293A (en) * | 2011-05-11 | 2011-09-14 | 重庆长安汽车股份有限公司 | Method for designing spatial curved surface of piston skirt |
| CN102184293B (en) * | 2011-05-11 | 2014-06-11 | 重庆长安汽车股份有限公司 | Method for designing spatial curved surface of piston skirt |
| CN104776821A (en) * | 2015-03-27 | 2015-07-15 | 中国北方发动机研究所(天津) | Dimension estimation method for high-power-density diesel engine for vehicle |
| CN108457763A (en) * | 2018-03-23 | 2018-08-28 | 浙江吉利控股集团有限公司 | A kind of air cylinder sleeve of engine |
| CN108457763B (en) * | 2018-03-23 | 2020-03-24 | 贵州吉利发动机有限公司 | Engine cylinder sleeve |
| CN108694287A (en) * | 2018-05-25 | 2018-10-23 | 郑州飞机装备有限责任公司 | A method of solving start cylinder speed using simulation software |
| CN108694287B (en) * | 2018-05-25 | 2022-08-05 | 郑州飞机装备有限责任公司 | Method for solving speed of actuating cylinder by using simulation software |
| CN110993132A (en) * | 2019-12-05 | 2020-04-10 | 上海核工程研究设计院有限公司 | Transient monitoring method for supporting fatigue monitoring function of nuclear power plant |
| CN110993132B (en) * | 2019-12-05 | 2022-07-22 | 上海核工程研究设计院有限公司 | Transient monitoring method for supporting fatigue monitoring function of nuclear power plant |
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