CN112989662A - Finite element calculation method for flexible pin structure of wind power gear box - Google Patents
Finite element calculation method for flexible pin structure of wind power gear box Download PDFInfo
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
- G06T17/20—Finite element generation, e.g. wire-frame surface description, tesselation
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2111/00—Details relating to CAD techniques
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
Abstract
The invention discloses a finite element calculation method of a flexible pin structure of a wind power gear box, and relates to the technical field of wind power generation; the method comprises the following steps: establishing a detailed three-dimensional geometric model of the flexible pin structure parts in SolidWorks software; importing a detailed three-dimensional geometric model of the part into finite element software, and preprocessing and solving the part in the finite element software; and (3) post-processing the calculation result: checking the calculation stress, strain and displacement results of each part; according to the invention, the contact relations of gear engagement, bearing rolling, interference between the flexible pin and the flexible pin sleeve as well as interference between the flexible pin and the planet carrier and the like are processed by establishing a detailed flexible pin structure calculation model according to the actual interaction and constraint conditions of the parts, and the load is applied to the external parts without researching the acting force distribution on the flexible pin sleeve, so that the calculation results of the flexible pin, the flexible pin sleeve and the planet carrier are more accurate and more in line with the actual conditions, and the calculation accuracy is superior to that of the traditional finite element calculation method.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a finite element calculation method for a flexible pin structure of a wind power gear box.
Background
In recent years, domestic wind power is rapidly developed, market competition of various host plants and component plants is more and more intense, domestic wind power technology is more and more mature, products are larger, cost performance requirements of the products are higher and higher, and therefore requirements on design and manufacturing are higher and higher;
the wind power gear box is an important part of a fan, and is required to be compact in structure and large in transmission ratio. Therefore, a multi-stage planetary gear transmission structure is often adopted, and the requirements on the safety of gears and weight closing parts are high. The flexible pin structure has certain superiority, and has the advantages of small all-round coefficient, small gear meshing dislocation quantity and the like. The calculations and optimizations are typically performed by finite element methods at design time. The traditional finite element calculation processing method of the flexible pin structure is characterized in that a flexible pin structure calculation model is simplified into three parts, namely a planet carrier, a flexible pin and a pin sleeve, the connection relation among the parts is subjected to contact or binding processing, the bearing acting force applied outside the pin sleeve is uniform distribution force, and the bearing acting force is generally fixedly restricted on the mounting surface of the planet carrier; the prior art has the following defects:
1. the deviation between the traditional finite element calculation and the actual condition is large; because the gear meshing and bearing rolling contact constraint relation condition is not considered, the calculated deformation of the flexible pin and the flexible pin sleeve is larger than an actual value, so that the calculated stress value is larger, and the calculation safety is conservative;
2. the traditional finite element calculation method is characterized in that loads are uniformly applied to the flexible pin sleeves, which is not in accordance with the actual situation that the acting force of the planet wheel bearing acting on the flexible pin sleeves is not uniformly distributed, the distribution rule of the acting force is difficult to accurately describe by a direct load application mode, the load distribution is different from the actual situation, and the calculation result of the part to which the loads are applied deviates from the actual situation.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a finite element calculation method for a flexible pin structure of a wind power gear box. According to the invention, the contact relations such as gear engagement, bearing rolling, interference between the flexible pin and the flexible pin sleeve as well as the planet carrier are processed according to the actual situation, so that the calculation result is more in line with the actual situation; the method can accurately calculate the deformation conditions of the flexible pin, the flexible pin sleeve, the planet wheel and the sun wheel, provide basis for the tooth direction modification amount of the gear, and also can accurately calculate the strength and the opening degree conditions of the flexible pin, the flexible pin sleeve and the planet carrier; the calculation accuracy is superior to that of the traditional finite element calculation method.
The purpose of the invention can be realized by the following technical scheme: a finite element calculation method for a flexible pin structure of a wind power gear box comprises the following steps:
the method comprises the following steps: establishing a detailed three-dimensional geometric model of the flexible pin structure parts in SolidWorks software;
step two: importing the detailed three-dimensional geometric model of the part into finite element software in a step, iges or stl data format, and preprocessing and solving the part in the finite element software; the pre-processing step comprises the steps of unit type setting and dividing, material attribute setting, part assembly, contact relation definition between parts, loading, constraint, calculation condition definition, analysis step, output result parameter and calculation job name submitting and solving calculation;
step three: and (3) post-processing the calculation result: and checking the stress, strain and displacement calculation results of each part.
Further, in the first step, a detailed three-dimensional geometric model of the flexible pin structure part is established in SolidWorks software; the method specifically comprises the following steps:
s11: the detailed three-dimensional geometric model is represented by establishing a geometric three-dimensional model of a flexible pin, a flexible pin sleeve, a planet carrier, a gear ring, a planet wheel, a sun wheel, a planet wheel bearing outer ring, a planet wheel bearing roller and a planet wheel bearing inner ring; small characteristics such as small chamfers, small holes and the like of the non-stress concentration area can be eliminated;
s12: and (3) assembling the parts in SolidWorks software, and exporting the three-dimensional models of the parts in a data format which can be accepted by finite element software such as step, iges or stl.
Further, in the second step, the detailed three-dimensional geometric model of the part is imported into finite element software in a step, iges or stl data format, and the part is preprocessed and solved in the finite element software; the method specifically comprises the following steps:
s21: introducing a part three-dimensional model into finite element software for geometric processing, defining material properties, defining unit types and dividing units;
s22: the flexible pin and the flexible pin sleeve use hexahedral units, the planet carrier uses tetrahedron units for 1 time, and then the parts are assembled;
s23: defining contact relations among the parts according to the connection condition among the parts, and setting interference contact relations among the flexible pins and pin holes of the planet carrier and between the flexible pins and sleeve holes of the flexible pins according to maximum or minimum interference;
s24: as shown in fig. 3; defining load and constraint boundary conditions: the calculation model comprises parts such as a flexible pin, a flexible pin sleeve, a planet carrier, a gear ring, a planet wheel, a sun wheel, a planet wheel bearing outer ring, a planet wheel bearing roller, a planet wheel bearing inner ring and the like, the connection relation among the parts is subjected to contact interference and binding treatment according to a design drawing or manufacturing and using actual conditions, external force is intensively applied to the mounting surface of the planet carrier, and the mounting surface of the sun wheel is fixedly restrained;
s25: defining load working condition, analyzing step, setting result parameter to be output, defining calculation operation name, and submitting to solving calculation to obtain calculation result file.
Further, the calculation result is post-processed in the third step: checking the calculation stress, strain and displacement results of each part; the method specifically comprises the following steps:
s31: importing a calculation result file, and performing post-processing on a calculation result; the post-processing comprises checking a Von Mises stress cloud chart of each part; (ii) a Calculating the displacement conditions among the flexible pin, the pin sleeve and the planet carrier; and checking the opening condition between the flexible pin and the planet carrier.
Further, look over the opening condition between flexible round pin and the planet carrier, concrete step is:
acquiring the pressure of a contact area between the flexible pin and the planet carrier, and marking as N1;
if N1 is greater than 0MPa, it means that no opening has occurred, i.e. the flexpin has not disengaged from the carrier at the contact zone.
Further, the detailed three-dimensional geometric model is represented as a geometric three-dimensional model for establishing a flexible pin, a flexible pin sleeve, a planet carrier, a gear ring, a planet wheel, a sun wheel, a planet wheel bearing outer ring and a planet wheel bearing inner ring; and respectively coupling the inner ring and the outer ring of the bearing with the central point of the bearing, and applying the bearing rigidity under the corresponding working condition calculated by the transmission simulation software.
The invention has the beneficial effects that: establishing a detailed three-dimensional geometric model of the flexible pin structure parts in SolidWorks software, respectively coupling the inner ring and the outer ring of the bearing with the central point of the bearing, and applying the bearing rigidity under the corresponding working condition calculated by transmission simulation software; according to the invention, the contact relation between the parts is processed according to the actual interaction and constraint conditions of the parts by establishing a detailed flexible pin structure calculation model, the load is applied to the external parts, and the distribution of acting force on the flexible pin sleeve is not required to be researched, so that the calculation results of the flexible pin, the flexible pin sleeve and the planet carrier are more accurate and more suitable for the actual conditions, and the deviation between the calculation results and the test results is less than 5% through comparison with the test. The method can accurately calculate the deformation conditions of the flexible pin, the flexible pin sleeve, the planet wheel and the sun wheel, provides a basis for the tooth direction modification amount of the gear, and also can accurately calculate the strength and the opening degree conditions of the flexible pin, the flexible pin sleeve and the planet carrier. The calculation accuracy is superior to that of the traditional finite element calculation method.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic diagram of a conventional finite element calculation model of a compliant pin structure;
FIG. 3 is a schematic diagram of a finite element model according to the present invention;
FIG. 4 is a schematic view of a Von Mises stress cloud diagram of a flexible pin structure according to the present invention;
FIG. 5 is a schematic view of pin and pin sleeve displacement for the flexible pin construction of the present invention;
FIG. 6 is a schematic view of the opening between the flexpin and the planet carrier of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1-6; a finite element calculation method for a flexible pin structure of a wind power gear box comprises the following steps:
the method comprises the following steps: establishing a detailed three-dimensional geometric model of the flexible pin structure parts in SolidWorks software; the method specifically comprises the following steps:
s11: the detailed three-dimensional geometric model is represented by establishing a geometric three-dimensional model of a flexible pin, a flexible pin sleeve, a planet carrier, a gear ring, a planet wheel, a sun wheel, a planet wheel bearing outer ring, a planet wheel bearing roller and a planet wheel bearing inner ring; small characteristics such as small chamfers, small holes and the like of the non-stress concentration area can be eliminated;
s12: assembling parts in SolidWorks software, and leading out a three-dimensional model of the parts in a data format which can be accepted by finite element software such as step, iges or stl;
step two: importing the detailed three-dimensional geometric model of the part into finite element software in a step, iges or stl data format, and preprocessing and solving the part in the finite element software; the pre-processing step comprises the steps of unit type setting and dividing, material attribute setting, part assembly, contact relation definition between parts, loading, constraint, calculation condition definition, analysis step, output result parameter and calculation job name submitting and solving calculation; the method specifically comprises the following steps:
s21: introducing a part three-dimensional model into finite element software for geometric processing, defining material properties, defining unit types and dividing units;
s22: the flexible pin and the flexible pin sleeve use hexahedral units, the planet carrier uses tetrahedron units for 1 time, and then the parts are assembled;
s23: defining contact relations among the parts according to the connection condition among the parts, and setting interference contact relations among the flexible pins and pin holes of the planet carrier and between the flexible pins and sleeve holes of the flexible pins according to maximum or minimum interference;
s24: as shown in fig. 3; defining load and constraint boundary conditions: the calculation model comprises parts such as a flexible pin, a flexible pin sleeve, a planet carrier, a gear ring, a planet wheel, a sun wheel, a planet wheel bearing outer ring, a planet wheel bearing roller, a planet wheel bearing inner ring and the like, the connection relation among the parts is subjected to contact interference and binding treatment according to a design drawing or manufacturing and using actual conditions, external force is intensively applied to the mounting surface of the planet carrier, and the mounting surface of the sun wheel is fixedly restrained;
s25: defining load working condition, analyzing, setting result parameters to be output, defining calculation operation name, and submitting to solving calculation to obtain a calculation result file;
step three: and (3) post-processing the calculation result: checking the calculation stress, strain and displacement results of each part; the method specifically comprises the following steps:
s31: importing a calculation result file, and performing post-processing on a calculation result; 4-6, the post-processing includes viewing the Von Mises stress cloud plots for each part; calculating the displacement conditions among the flexible pin, the pin sleeve and the planet carrier; checking the opening condition between the flexible pin and the planet carrier;
look over the opening condition between flexible round pin and the planet carrier, concrete step is:
acquiring the pressure of a contact area between the flexible pin and the planet carrier, and marking as N1; if N1 is greater than 0MPa, it means that no opening has occurred, i.e. the flexpin and the carrier do not disengage at the contact zone;
according to the invention, a detailed flexible pin structure calculation model is established to process the contact relation between the parts according to the actual interaction and constraint conditions of the parts, and the load is applied to the external parts without researching the acting force distribution on the flexible pin sleeve, so that the calculation results of the flexible pin, the flexible pin sleeve and the planet carrier are more accurate and more suitable for the actual conditions, and the deviation between the calculation results and the test results is less than 5% through comparison with the test;
example 2
Because the detailed calculation model of the inner ring and the outer ring of the bearing and the bearing roller is added in the calculation model, the calculation workload is large during finite element calculation, the problem of poor convergence is easy to occur, the bearing roller can be removed, the inner ring and the outer ring of the bearing are reserved, and the simplification processing is carried out. Respectively coupling the inner ring and the outer ring of the bearing with the center point of the bearing, and applying the bearing rigidity under the corresponding working condition calculated by transmission simulation software;
the detailed three-dimensional geometric model is represented by establishing a geometric three-dimensional model of a flexible pin, a flexible pin sleeve, a planet carrier, a gear ring, a planet wheel, a sun wheel, a planet wheel bearing outer ring and a planet wheel bearing inner ring; respectively coupling the inner ring and the outer ring of the bearing with the center point of the bearing, and applying the bearing rigidity under the corresponding working condition calculated by transmission simulation software;
the method can accurately calculate the deformation conditions of the flexible pin, the flexible pin sleeve, the planet wheel and the sun wheel, provides a basis for the tooth direction modification amount of the gear, and also can accurately calculate the strength and the opening degree conditions of the flexible pin, the flexible pin sleeve and the planet carrier. The calculation accuracy is superior to that of the traditional finite element calculation method.
The working principle of the invention is as follows:
a finite element calculation method of a flexible pin structure of a wind power gear box comprises the steps of firstly establishing a detailed three-dimensional geometric model of parts of the flexible pin structure in SolidWorks software when the method works; the detailed three-dimensional geometric model is represented by establishing a geometric three-dimensional model of a flexible pin, a flexible pin sleeve, a planet carrier, a gear ring, a planet wheel, a sun wheel, a planet wheel bearing outer ring, a planet wheel bearing roller and a planet wheel bearing inner ring; small characteristics such as small chamfers, small holes and the like of the non-stress concentration area can be eliminated; assembling parts in SolidWorks software, and leading out a three-dimensional model of the parts in a data format which can be accepted by finite element software such as step, iges or stl; then, importing the detailed three-dimensional geometric model of the part into finite element software, and preprocessing the part in the finite element software; introducing a part three-dimensional model into finite element software for geometric processing, defining material properties, defining unit types and dividing units; the flexible pin and the flexible pin sleeve use hexahedral units, the planet carrier uses tetrahedron units for 1 time, and then the parts are assembled; defining contact relations among the parts according to the connection condition among the parts, and setting interference contact relations among the flexible pins and pin holes of the planet carrier and between the flexible pins and sleeve holes of the flexible pins according to maximum or minimum interference; defining load and constraint boundary conditions: external force is intensively applied to the installation surface of the planet carrier, and the installation surface of the sun gear is fixedly restrained; defining load working condition, analyzing, setting result parameters to be output, defining calculation operation name, and submitting to solving calculation to obtain a calculation result file;
and finally, post-processing the calculation result: checking the calculation stress, strain and displacement results of each part; importing a calculation result file, and performing post-processing on a calculation result; the post-processing comprises checking a Von Mises stress cloud chart of each part; calculating the displacement conditions among the flexible pin, the pin sleeve and the planet carrier; checking the opening condition between the flexible pin and the planet carrier; according to the invention, the contact relation between the parts is processed according to the actual interaction and constraint conditions of the parts by establishing a detailed flexible pin structure calculation model, the load is applied to the external parts, and the distribution of acting force on the flexible pin sleeve is not required to be researched, so that the calculation results of the flexible pin, the flexible pin sleeve and the planet carrier are more accurate and more suitable for the actual conditions, and the deviation between the calculation results and the test results is less than 5% through comparison with the test. The method can accurately calculate the deformation conditions of the flexible pin, the flexible pin sleeve, the planet wheel and the sun wheel, provides a basis for the tooth direction modification amount of the gear, and also can accurately calculate the strength and the opening degree conditions of the flexible pin, the flexible pin sleeve and the planet carrier. The calculation accuracy is superior to that of the traditional finite element calculation method.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (6)
1. A finite element calculation method for a flexible pin structure of a wind power gear box is characterized by comprising the following steps:
the method comprises the following steps: establishing a detailed three-dimensional geometric model of the flexible pin structure parts in SolidWorks software;
step two: importing the detailed three-dimensional geometric model of the part into finite element software in a step, iges or stl data format, and preprocessing and solving the part in the finite element software; the pre-processing step comprises the steps of unit type setting and dividing, material attribute setting, part assembly, contact relation definition between parts, loading, constraint, calculation condition definition, analysis step, output result parameter and calculation job name submitting and solving calculation;
step three: and (3) post-processing the calculation result: and checking the stress, strain and displacement calculation results of each part.
2. A finite element calculation method of a flexible pin structure of a wind power gear box according to claim 1, wherein in the first step, a detailed three-dimensional geometric model of the flexible pin structure parts is established in SolidWorks software; the method specifically comprises the following steps:
s11: the detailed three-dimensional geometric model is represented by establishing a geometric three-dimensional model of a flexible pin, a flexible pin sleeve, a planet carrier, a gear ring, a planet wheel, a sun wheel, a planet wheel bearing outer ring, a planet wheel bearing roller and a planet wheel bearing inner ring; wherein, small chamfers and small holes of a non-stress concentration area are removed;
s12: and (4) assembling the parts in SolidWorks software, and exporting the three-dimensional models of the parts in a step, iges or stl data format.
3. A finite element calculation method of a wind power gear box flexible pin structure according to claim 1, wherein in the second step, a detailed three-dimensional geometric model of the part is imported into finite element software in a step, iges or stl data format, and the part is preprocessed and solved in the finite element software; the method specifically comprises the following steps:
s21: importing a detailed three-dimensional geometric model of the part into finite element software for geometric processing, defining material properties, defining unit types and dividing units;
s22: the flexible pin and the flexible pin sleeve use hexahedral units, the planet carrier uses tetrahedron units for 1 time, and then the parts are assembled;
s23: defining contact relations among the parts according to the connection condition among the parts, and setting interference contact relations among the flexible pins and pin holes of the planet carrier and between the flexible pins and sleeve holes of the flexible pins according to maximum or minimum interference;
s24: defining load and constraint boundary conditions: the calculation model comprises parts such as a flexible pin, a flexible pin sleeve, a planet carrier, a gear ring, a planet wheel, a sun wheel, a planet wheel bearing outer ring, a planet wheel bearing roller, a planet wheel bearing inner ring and the like, the connection relation among the parts is subjected to contact interference and binding treatment according to a design drawing or manufacturing and using actual conditions, external force is intensively applied to the mounting surface of the planet carrier, and the mounting surface of the sun wheel is fixedly restrained;
s25: defining load working condition, analyzing step, setting result parameter to be output, defining calculation operation name, and submitting to solving calculation to obtain calculation result file.
4. A finite element calculation method of a wind power gear box flexible pin structure according to claim 1, wherein the calculation result is post-processed in the third step: checking the calculation stress, strain and displacement results of each part; the method specifically comprises the following steps:
s31: importing a calculation result file, and performing post-processing on a calculation result; the post-processing comprises checking a Von Mises stress cloud chart of each part; calculating the displacement conditions among the flexible pin, the pin sleeve and the planet carrier; and checking the opening condition between the flexible pin and the planet carrier.
5. A finite element calculation method of a wind power gearbox flexible pin structure as defined in claim 4, wherein the step of checking the opening between the flexible pin and the planet carrier comprises the following specific steps:
acquiring the pressure of a contact area between the flexible pin and the planet carrier, and marking as N1; if N1 is greater than 0MPa, it means that no opening has occurred, i.e. the flexpin has not disengaged from the carrier at the contact zone.
6. A finite element calculation method of a wind power gear box flexible pin structure according to claim 1, wherein the detailed three-dimensional geometric model is represented by establishing a geometric three-dimensional model of a flexible pin, a flexible pin sleeve, a planet carrier, a gear ring, a planet wheel, a sun wheel, a planet wheel bearing outer ring and a planet wheel bearing inner ring; and respectively coupling the inner ring and the outer ring of the bearing with the central point of the bearing, and applying the bearing rigidity under the corresponding working condition calculated by the transmission simulation software.
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