CN104102777B - A kind of one-dimensional dynamic analysis method of crankshaft - Google Patents
A kind of one-dimensional dynamic analysis method of crankshaft Download PDFInfo
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- CN104102777B CN104102777B CN201410338425.3A CN201410338425A CN104102777B CN 104102777 B CN104102777 B CN 104102777B CN 201410338425 A CN201410338425 A CN 201410338425A CN 104102777 B CN104102777 B CN 104102777B
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- 238000004458 analytical method Methods 0.000 title claims abstract description 34
- 239000010687 lubricating oil Substances 0.000 claims abstract description 7
- 238000004880 explosion Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 5
- 229910001208 Crucible steel Inorganic materials 0.000 claims description 4
- 229910001141 Ductile iron Inorganic materials 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000003921 oil Substances 0.000 claims description 4
- 230000008450 motivation Effects 0.000 abstract 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The present invention relates to motivation design field more particularly to a kind of one-dimensional dynamic analysis methods of crankshaft.The present invention provides a kind of one-dimensional dynamic analysis method of crankshaft, comprising the following steps: A, the related data for collecting engine structure information and crankshaft system part；B, the finite element analysis model of engine and crankshaft system components is established；C, lubricating oil and explosion pressure curve are selected, loads on crankshaft solution is carried out；D, the information inputs finite element analysis model such as check of crankshaft, fillet, oilhole is solved；E, stress and safety coefficient solving result are calculated according to step D, crankshaft is evaluated.The present invention does not need to carry out grid dividing to part；Analysis model is established quick；The calculating solution time is short, is a kind of high-efficient, time-consuming short, high reliablity analysis method.
Description
Technical Field
The invention relates to the field of engine design, in particular to a crankshaft one-dimensional dynamics analysis method.
Background
The crankshaft is one of the most important parts of the engine, and its dimensional parameters largely affect not only the overall size and weight of the engine, but also the reliability and life of the engine. A crank shaft failure event may cause serious damage to other parts and the engine. In the engine concept development stage, design variables such as the structural form, the dimensional parameters, the materials and the process of the crankshaft need to be determined as soon as possible. Therefore, in the engine conceptual design stage, it is very important to perform fast, efficient and accurate dynamic analysis on the crankshaft stress and the safety factor.
The traditional crankshaft strength analysis needs to establish an FEM finite element model of the whole engine, and complex parts such as a cylinder body, a cylinder cover, a crankshaft and the like are divided into finite element grids and the grid assembly is long in time consumption; the quantity of the grids is large, and the quality of the finite element grids is difficult to ensure; under the condition of huge grid quantity, finite element analysis consumes long time; the finite element calculation is difficult to converge, the analysis is easy to fail, and the like.
Disclosure of Invention
Aiming at the defects or shortcomings in the prior art, the invention aims to solve the technical problems that: the crankshaft one-dimensional dynamics analysis method is short in time consumption, high in efficiency and high in reliability.
The invention adopts the technical scheme that a crankshaft one-dimensional dynamics analysis method is provided, and the method comprises the following steps:
A. collecting engine structure information and related data of crankshaft system parts;
B. establishing a finite element analysis model of the engine and the crankshaft system parts;
C. selecting lubricating oil and an explosion pressure curve, and solving the load of the crankshaft;
D. inputting information such as crank arms, round corners and oil holes of the crankshaft into a finite element analysis model for solving;
E. and D, calculating a stress and safety coefficient solving result according to the step D, and evaluating the crankshaft.
As a further improvement of the invention, the engine information comprises the number of cylinders, the number of main bearings, the position of a thrust bearing, the type of cylinder arrangement, the direction of rotation, the stroke, the firing order, the cylinder center distance, the cylinder diameter, the cylinder bore offset, the piston offset
As a further improvement of the invention, the parts of the crankshaft system comprise a piston, a connecting rod, a bearing, a crankshaft and a flywheel.
As a further refinement of the invention, said step D comprises defining material and output settings.
As a further improvement of the present invention, said step E is followed by a step F: and C, evaluating that the design requirements are not met, needing to change the crankshaft structure, and re-entering the step A for cycle analysis.
As a further improvement of the invention, the design requirements are that the safety coefficient of the nodular cast iron crankshaft and the shaft neck fillet is 1.7, and the safety coefficient of the cast steel crankshaft and the shaft neck fillet is 1.4.
The invention has the beneficial effects that: the analysis method of the invention does not need to divide the grids of the parts; the analysis model is established quickly; the calculation and solving time is short.
Drawings
FIG. 1 is a flow chart of a crankshaft one-dimensional dynamics analysis method of the present invention.
Detailed Description
The invention is further described with reference to the following description and embodiments in conjunction with the accompanying drawings.
As shown in fig. 1, the technical scheme adopted by the invention is to provide a crankshaft one-dimensional dynamics analysis method, which comprises the following steps:
A. collecting engine structure information and related data of crankshaft system parts; the engine structure information comprises the number of cylinders, strokes, ignition sequence and the like, and the related information of parts such as a crankshaft part piston, a connecting rod, a bearing, a crankshaft and the like;
B. establishing a finite element analysis model of the engine and the crankshaft system parts;
C. selecting lubricating oil and an explosion pressure curve, and solving the load of the crankshaft;
D. inputting information such as crank arms, round corners and oil holes of the crankshaft into a finite element analysis model for solving;
E. and D, calculating a stress and safety coefficient solving result according to the step D, and evaluating the crankshaft.
The engine information comprises the number of cylinders, the number of main bearings, the position of a thrust bearing, the arrangement type of the cylinders, the rotation direction, the stroke, the ignition sequence, the center distance of the cylinders, the diameter of the cylinders, the offset of cylinder holes and the offset of pistons
The crankshaft system parts comprise a piston, a connecting rod, a bearing, a crankshaft and a flywheel.
Said step D comprises defining material and output settings.
Step E is followed by step F: and C, evaluating that the design requirements are not met, needing to change the crankshaft structure, and re-entering the step A for cycle analysis.
The design requirements are that the safety coefficient of the nodular cast iron crankshaft and the shaft neck fillet is 1.7, and the safety coefficient of the cast steel crankshaft and the shaft neck fillet is 1.4.
Example 1: and (3) inputting the information of the engine structure and the parts of the crankshaft system into the Engdyn model by using a Ricardo software Engdyn module. And grids are not required to be divided, so that a large amount of time is saved, and the analysis period is greatly shortened.
And selecting lubricating oil, wherein an lubricating oil database is arranged in the Engdyn, and proper lubricating oil information is selected.
And inputting the explosion pressure curve of each working condition of the engine into Loading of Engdyn.
And after the solution setting is completed, performing analysis calculation by using Engdyn to obtain the crankshaft load under each working condition.
And inputting explosion pressure of each working condition, and calculating boundary conditions by using the PU.
In Engdyn, using Crank Analysis and a classic method, stress and safety coefficient calculation is performed on Crank arms, connecting rod journal fillets, main journal fillets, oil holes and the like.
Defining materials and output settings, and performing solution calculation.
And evaluating the crankshaft system according to the calculation result, if the crankshaft system does not meet the design requirement, modifying the crankshaft structure, and recalculating. The design requirements are that the safety factor of the nodular cast iron crankshaft and the shaft neck fillet is 1.7, and the safety factor of the cast steel crankshaft and the shaft neck fillet is 1.4.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (3)
1. A one-dimensional dynamics analysis method of a crankshaft is characterized by comprising the following steps: the method comprises the following steps:
A. collecting engine structure information and related data of crankshaft system parts;
B. establishing a finite element analysis model of the engine and the crankshaft system parts;
C. selecting lubricating oil and an explosion pressure curve, and solving the load of the crankshaft;
D. inputting the information of crank arms, fillets and oil holes of the crankshaft into a finite element analysis model for solving;
E. calculating stress and safety coefficient solving results according to the step D, and evaluating the crankshaft;
wherein,
the engine structure information comprises the number of cylinders, the number of main bearings, the position of a thrust bearing, the arrangement type of the cylinders, the rotating direction, the stroke, the ignition sequence, the center distance of the cylinders, the diameter of the cylinders, the offset of cylinder holes and the offset of pistons;
the crankshaft system parts comprise a piston, a connecting rod, a bearing, a crankshaft and a flywheel;
said step D comprises defining material and output settings.
2. The crankshaft one-dimensional dynamics analysis method of claim 1, wherein: step E is followed by step F: and C, evaluating that the design requirements are not met, needing to change the crankshaft structure, and re-entering the step A for cycle analysis.
3. The crankshaft one-dimensional dynamics analysis method of claim 2, wherein: the design requirements are that the safety coefficient of the nodular cast iron crankshaft and the shaft neck fillet is 1.7, and the safety coefficient of the cast steel crankshaft and the shaft neck fillet is 1.4.
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| CN201410338425.3A CN104102777B (en) | 2014-07-16 | 2014-07-16 | A kind of one-dimensional dynamic analysis method of crankshaft |
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| CN201410338425.3A CN104102777B (en) | 2014-07-16 | 2014-07-16 | A kind of one-dimensional dynamic analysis method of crankshaft |
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| CN104102777B true CN104102777B (en) | 2019-06-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203201995U (en) * | 2013-03-14 | 2013-09-18 | 南车玉柴四川发动机股份有限公司 | High-power marine engine crankshaft |
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| CN203201995U (en) * | 2013-03-14 | 2013-09-18 | 南车玉柴四川发动机股份有限公司 | High-power marine engine crankshaft |
Non-Patent Citations (2)
| Title |
|---|
| 基于数字样机技术的曲轴多体动力学和有限元分析;钟智攀;《万方数据库-学位论文库》;20091019;正文第3-4章 |
| 高强化柴油机曲轴主轴承润滑特性研究;向建华等;《润滑与密封》;20091231;第34卷(第12期);第63-68页 |
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