CN100495412C - Engine crankshaft dynamic analysis method - Google Patents
Engine crankshaft dynamic analysis method Download PDFInfo
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- CN100495412C CN100495412C CNB2007101660780A CN200710166078A CN100495412C CN 100495412 C CN100495412 C CN 100495412C CN B2007101660780 A CNB2007101660780 A CN B2007101660780A CN 200710166078 A CN200710166078 A CN 200710166078A CN 100495412 C CN100495412 C CN 100495412C
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- 238000004458 analytical method Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000004364 calculation method Methods 0.000 claims abstract description 13
- 238000004088 simulation Methods 0.000 claims abstract description 8
- 238000005457 optimization Methods 0.000 claims abstract description 5
- 238000011156 evaluation Methods 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 238000012805 post-processing Methods 0.000 abstract 1
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Abstract
The invention discloses an analysis method of motor crank dynamics, which includes that: in Hypermesh software, a crank system is divided by finite element mesh generation into a crank, a flywheel, a belt pulley, a timing gear and a main bearing seat etc.; use Nastran software to execute the reduction solving of a finite element substructure; in EXCITE software, construct a model of the crank system dynamics, and exert the corresponding boundary condition on elements to implement simulation calculation; use the Nastran software to implement restoration solving of dynamic stress on the crank, perform post-processing and execute fatigue analysis on dangerous points; reasonably evaluate the crank system according to the results, and if the structure is not reasonable, the structure optimization is still needed. The method uses EXCITE calculation technique to execute dynamics analysis on the motor crank, obtains the strength and the fatigue parameters of the motor crank, and further evaluates the structure parameters of the crank and the related parts of the motor reasonably, therefore, making the improvement thereof.
Description
Technical field
The present invention relates to the engine crankshaft dynamic analysis.
Background technology
The intensity and the fatigue of precognition engine crankshaft dynamic are a very important job in the engine concept design phase.At conceptual phase, a lot of parameters all are in undetermined state, and these parameters will change according to requirements such as engine crankshaft dynamics.Engine crankshaft intensity and fatigue then are main Considerations.More than the factor of its influence, be difficult to obtain concrete influence factor.If after production, change cycle of the exploitation that not only extended but also increased cost of developing.
Summary of the invention
The invention discloses a kind of engine crankshaft dynamic analysis method, specific as follows:
In Hypermesh software crankshaft system being carried out finite element grid divides: bent axle, flywheel, belt pulley, time gear and main bearing seat etc.;
Using Nastran software to carry out the reduction of finite element minor structure finds the solution;
In EXCITE software, build the crankshaft system kinetic model, unit piece is applied corresponding boundary condition, carry out simulation calculation;
Use Nastran software that bent axle is carried out dynamic stress and recover to find the solution, carry out aftertreatment, and dangerous point is carried out analysis of fatigue;
According to the result crankshaft system is carried out rational evaluation, if unreasonable structure also needs to carry out suitable structure optimization.
This method utilization EXCITE computed in software technology is carried out dynamic analysis to engine crankshaft, obtains the structural parameters of engine crankshaft system, and then engine crankshaft system and relevant a lot of component structural parameters are carried out rational evaluation, and carry out computation optimization.Practice shows that this method is fast and effectively for the component structural parameter of estimating and the optimization engine crankshaft is.
Description of drawings
Fig. 1: the finite element model of crankshaft system;
Fig. 2: the FE model of simple and easy main bearing wall;
Fig. 3: the main degree of freedom node before the compression;
Fig. 4: user interface;
Fig. 5: the EXCITE realistic model of crankshaft system;
Fig. 6: submit task interface to;
Fig. 7: crankshaft bearing load diagram;
Fig. 8: the whole stressed cloud atlas of crankshaft system under certain operating mode;
Fig. 9: king journal fillet dangerous point stress diagram and dangerous point stress enlarged drawing;
Figure 10: the stress diagram of dangerous point on the crank pin;
Figure 11: Smith figure.
Embodiment
Now in conjunction with the accompanying drawings the application's analytical approach is described further.
1. grid dividing:
1.1 crankshaft system grid dividing
When crankshaft system was carried out grid dividing, in order to guarantee carrying out smoothly and higher computational accuracy being arranged of crankshaft system dynamic analysis, must guarantee had enough grid precision at the fillet place, as shown in Figure 1.Because the model of crankshaft system is bigger, design condition is many, so Substructure Method, i.e. mode compression method are adopted in the calculating of crankshaft system.
1.2 simple and easy main bearing wall finite element model
Simple and easy main bearing wall FE model adopts hexahedral mesh, requires the unit number of plies of main bearing cinclides identical with the unit number of plies on the main bearing journal, must be that five equilibrium is equally spaced.As shown in Figure 2.
The compression of 2 finite element models
Adopt Substructure Method, directly utilize 3D solid element FE model, define main degree of freedom node.With all cell compression in the FE model to the definition all main degree of freedom nodes on.Utilize MSC/PATRAN to add that at main degree of freedom node place a rigid layer RBE2 is used for disperseing load.Show as Fig. 3.Utilize finite element modal analysis solver MSC/NASTRAN that model is compressed on the main degree of freedom node.
3 EXCITE modellings
Should be according to particular problem and the required result who obtains, the modeling of analytical model is claimed.
After starting EXCITE, insert and definition body unit and linkage unit, carry out logic and connect.User interface is seen Fig. 4.
At first will build the EXCITE model that needs, the EXCITE model of crankshaft system as shown in Figure 5.
4 EXCITE simulation calculation
4.1 the EXCITE simulation calculation is submitted task to
The process of simulation calculation submission task as shown in Figure 6.
4.2 bearing load calculates
Utilize the force diagram of each main bearing seat under each operating mode, as shown in Figure 7.The bearing load situation form under each operating mode be can list, thereby the operating mode of maximum load point appearance and the position of appearance determined.
5 dynamic stress are recovered to calculate
Use the kinetic results of the main degree of freedom node of EXCITE structure member, carry out being discharged into the data recovery calculating of master mould degree of freedom from main degree of freedom.Further analyze dynamic stress by finite element software NASTRAN, the dynamic response that obtains whole model is separated, and then carries out analysis of fatigue.
Can determine the king journal fillet dangerous point of this operating mode drag and the maximum stress value of crank pin fillet dangerous point by Fig. 9, the two all should be less than the ultimate value of crankshaft material itself, and strength of crankshaft just can meet the demands.
6 analysiss of fatigue
As Figure 10 is dangerous point stress curve figure, is specifying the position of finding corresponding crank pin fillet dangerous point under the operating mode.
According to the analysis of fatigue curve of AVL, i.e. the Smith curve map safety coefficient under this operating mode as can be known.The minimal security factor standard that is provided at different materials by AVL judges whether safety coefficient is reasonable again.
This method utilization EXCITE computing technique is carried out dynamic analysis to engine crankshaft, obtains the intensity and the tired parameter of engine crankshaft, and then the bent axle and the related components structural parameters of engine are carried out rational evaluation, and improve in view of the above.Practice shows that this method is extremely fast and effectively for the crankshaft structure of engine evaluated.
Claims (5)
1, a kind of engine crankshaft dynamic analysis method comprises the steps:
The grid dividing step: in Hypermesh software crankshaft system is carried out finite element grid and divide, when crankshaft system was carried out grid dividing, guarantee had enough grid precision at the fillet place;
Reduction solution procedure: use Nastran software to carry out the reduction of finite element minor structure and find the solution, wherein utilize 3D solid element model, define main degree of freedom node, utilize the finite element modal analysis solver to add that at main degree of freedom node place a rigid layer is used for disperseing load;
Simulation calculation step: in EXCITE software, build the crankshaft system kinetic model, unit piece is applied corresponding boundary condition, carry out simulation calculation;
Recover calculation procedure: use Nastran software that bent axle is carried out dynamic stress and recover to find the solution;
Analysis of fatigue step:, dangerous point is carried out analysis of fatigue recovering to carry out aftertreatment after the calculation procedure;
Evaluation procedure: according to the result crankshaft system is carried out rational evaluation, if unreasonable structure also needs to carry out suitable structure optimization.
2, analytical approach as claimed in claim 1 is characterized in that: the model of finite element comprises bent axle, flywheel, belt pulley, time gear and main bearing seat.
3, analytical approach as claimed in claim 1 or 2 is characterized in that: the simulation calculation of crankshaft system adopts Substructure Method.
4, analytical approach as claimed in claim 2 is characterized in that: main bearing wall model adopts hexahedral mesh, requires the unit number of plies of main bearing cinclides identical with the unit number of plies on the main bearing journal, must be that five equilibrium is equally spaced.
5, analytical approach as claimed in claim 4 is characterized in that: in recovering calculation procedure, use the kinetic results of the main degree of freedom node of EXCITE structure member, carry out being discharged into from main degree of freedom the data recovery calculating of master mould degree of freedom.
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| CNB2007101660780A CN100495412C (en) | 2007-11-02 | 2007-11-02 | Engine crankshaft dynamic analysis method |
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| CNB2007101660780A CN100495412C (en) | 2007-11-02 | 2007-11-02 | Engine crankshaft dynamic analysis method |
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| CN100495412C true CN100495412C (en) | 2009-06-03 |
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Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101628340B (en) * | 2009-02-18 | 2011-01-05 | 上海理工大学 | Optimization method for distance between headstock bearings of large ship used crankshaft lathe |
| CN102207996B (en) * | 2011-06-02 | 2013-10-16 | 奇瑞汽车股份有限公司 | Simulative calculation method for engine lubrication system |
| US20130247715A1 (en) * | 2012-03-23 | 2013-09-26 | GM Global Technology Operations LLC | Crankshaft for an internal combustion engine |
| CN102760183A (en) * | 2012-06-05 | 2012-10-31 | 湖南大学 | Bidirectional evolutionary structure topological optimization based disk type flywheel optimized design method |
| CN103093066A (en) * | 2013-02-23 | 2013-05-08 | 盐城工学院 | Diesel engine bent axle three-dimensional geometrical shape modeling method |
| CN103481014B (en) * | 2013-09-17 | 2016-06-01 | 奇瑞汽车股份有限公司 | Engine crankshaft fillet rolling and reinforcing method |
| CN104102778B (en) * | 2014-07-16 | 2018-07-31 | 上汽通用五菱汽车股份有限公司 | A kind of crankshaft dynamic analysis method |
| CN104102786A (en) * | 2014-07-23 | 2014-10-15 | 上汽通用五菱汽车股份有限公司 | Crankshaft three-dimensional kinetic analysis method efficient and quick in optimization |
| CN104102793B (en) * | 2014-08-04 | 2017-09-29 | 安徽江淮汽车集团股份有限公司 | Crankshaft System Analysis of Torsional Vibration method |
| CN104239654B (en) * | 2014-10-13 | 2017-09-26 | 中国科学院光电技术研究所 | A kind of bearing method for simplifying in Finite Element Simulation Analysis |
| CN105069224B (en) * | 2015-08-06 | 2017-12-08 | 北汽福田汽车股份有限公司 | A kind of crankshaft strength computational methods |
| CN105740499B (en) * | 2016-01-14 | 2018-10-16 | 华南农业大学 | Hillside orchard gently simplifies wheeled transport locomotive frame structure design and optimization method |
| CN108228936A (en) * | 2016-12-21 | 2018-06-29 | 华晨汽车集团控股有限公司 | A kind of connection rod of automobile engine dynamic analysis method |
| CN107180127B (en) * | 2017-04-28 | 2021-02-23 | 北京汽车股份有限公司 | Simulation method and device of automobile transmission system |
| CN107679347B (en) * | 2017-10-30 | 2020-06-23 | 山东云内动力有限责任公司 | Crankshaft stress analysis method based on finite element |
| CN112668217B (en) * | 2020-12-17 | 2022-09-13 | 东风汽车集团有限公司 | Analysis method and device for main bearing hydrodynamic lubrication based on designed profile |
| CN116341136A (en) * | 2023-03-21 | 2023-06-27 | 中国农业大学 | Engine crankshaft optimization design method |
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