CN114372399A - Method for determining position of part lifting hole based on finite element simulation analysis - Google Patents
Method for determining position of part lifting hole based on finite element simulation analysis Download PDFInfo
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- CN114372399A CN114372399A CN202210036266.6A CN202210036266A CN114372399A CN 114372399 A CN114372399 A CN 114372399A CN 202210036266 A CN202210036266 A CN 202210036266A CN 114372399 A CN114372399 A CN 114372399A
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- G06—COMPUTING; CALCULATING OR COUNTING
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- 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
- G06F—ELECTRIC DIGITAL DATA PROCESSING
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Abstract
The invention discloses a method for determining the position of a part lifting hole based on finite element simulation analysis, which comprises the following steps: s1: creating or importing a part model in finite element simulation analysis software, and carrying out finite element simulation analysis on the part model; s2: obtaining a deformation displacement value caused by the initial position of the part lifting hole according to S1, and formulating an optimization scheme of the position of the part lifting hole according to the deformation displacement value; s3: adjusting the position of the part lifting hole in the part model according to the part lifting hole S2, and performing finite element simulation analysis again according to the adjusted position of the part lifting hole; s4: judging whether the deformation displacement value generated by the part due to the position of the part lifting hole meets the assembly requirement or not according to S3, if so, not optimizing the position of the part lifting hole, and the current position is the optimal position of the part lifting hole; repeating S2-S3 if the assembly requirement is not met until the assembly requirement is met; s5: and determining the optimal position of the part lifting hole according to S4 and putting the part lifting hole into use.
Description
Technical Field
The invention relates to the technical field of part lifting, in particular to a method for determining the position of a part lifting hole based on finite element simulation analysis.
Background
When large-scale parts are assembled on site, the parts need to be lifted for convenience in operation, and the assembling contact surface of the parts is easy to deform due to the action of self gravity in the lifting process of the parts, so that the final assembling precision of the parts is influenced, and the repair cost of the parts is increased. However, the deformation degree of the assembly surface of the part and the position of the lifting hole of the part cannot be quantified in the design process of the existing product, and how to reduce the deformation of the assembly surface of the part in the lifting process is a problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a method for determining the position of a part lifting hole based on finite element simulation analysis, which reduces the deformation of an assembly surface of a part in the lifting process.
In order to achieve the purpose, the invention provides the following technical scheme: a method for determining the position of a part lifting hole based on finite element simulation analysis comprises the following steps:
s1: creating or importing a part model in finite element simulation analysis software, and carrying out finite element simulation analysis on the part model;
s2: obtaining a deformation displacement value generated in a part assembly area due to the initial position of a part lifting hole according to a finite element simulation analysis result, and formulating an optimization scheme of the position of the part lifting hole according to the deformation displacement value;
s3: adjusting the position of the part lifting hole in the part model according to the optimization scheme of the position of the part lifting hole, and performing finite element simulation analysis again according to the adjusted position of the part lifting hole;
s4: judging whether the deformation displacement value generated in the part assembly area due to the position of the part lifting hole meets the assembly requirement again according to the finite element simulation analysis result in the S3, and if the deformation displacement value meets the assembly requirement, not optimizing the position of the part lifting hole, wherein the current position is the optimal position of the part lifting hole; repeating S2-S3 if the assembly requirement is not met until the assembly requirement is met;
s5: and determining the optimal position of the part lifting hole according to the judgment result and putting the part lifting hole into use.
Further, theThe optimization scheme specifically comprises the following steps: when the nth suboptimum part lifting hole position is adopted, the available area of the part lifting hole position is divided into n +1 equal parts, and the part lifting hole position is adjusted towards the gravity center direction from the initial position every time
Wherein n is the number of times of optimizing the position of the component lifting hole, and n is 0,1,2,3 … n, m is the number of times of adjusting the position of the component lifting hole, and m is 1,2,3 … n; and after each adjustment is finished, carrying out finite element simulation analysis until the simulation analysis result meets the assembly requirement.
Further, the finite element simulation analysis in S1 and/or S3 specifically includes geometric cleaning of the part, mesh division, mesh quality inspection, establishment of materials and attributes, material assignment, application of boundary conditions and loads, then submitting the generated calculation file to software for calculation, and finally obtaining a finite element simulation analysis result.
Further, the assembling requirement in S4 is that the part deformation displacement value is not more than 0.0015 mm.
Further, the material property is a material density.
Further, the number of the part lifting holes is not less than 1.
Further, the finite element simulation analysis software includes HyperWorks, Ansys and/or Nastran.
Has the advantages that:
simulating the hoisting state of the part before the position of the hoisting hole is optimized through finite element simulation to obtain the initial deformation displacement value of the part; and then moving the position of the part lifting hole to the direction of reducing deformation according to the deformation trend of the part assembly surface, and carrying out finite element simulation on the improved model again to obtain the improved deformation displacement value of the part. And circulating the steps until the deformation displacement value of the part meets the precision requirements of design and assembly.
Drawings
FIG. 1 is a flow chart of a method for determining the position of a lifting hole of a part based on finite element simulation analysis according to the present invention;
FIG. 2 is a schematic view of the hoisting of the parts in example 1.
Detailed Description
The invention is further described in the following description in conjunction with specific embodiments, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout.
Example 1
When large-scale parts are assembled on site, the parts need to be lifted for convenience in operation, and the assembling surface of the parts is easy to deform due to the self gravity effect in the lifting process of the parts, so that the final assembling precision of the parts is influenced. Researches find that the deformation of a part in the hoisting process has a certain relation with the gravity center of the part, and the hoisting position of the part needs to be continuously adjusted in order to reduce the deformation of the part in the hoisting process.
Simulating the hoisting state of the part before the position of the hoisting hole is optimized through finite element simulation to obtain the initial deformation displacement value of the part; and then moving the position of the part lifting hole to the direction of reducing deformation according to the deformation trend of the part assembly surface, and carrying out finite element simulation on the improved model again to obtain the improved deformation displacement value of the part. And circulating the steps until the deformation displacement value of the part meets the precision requirements of design and assembly.
As shown in FIG. 2, a point C (x) is setc,yc,zc) For the center of gravity of the model, it is assumed that the model is divided into a plurality of tiny cells, the density of each cell is rho, and the volume of each cell is DeltaViWeight of each unit is Δ WiAnd if the total volume of the model is V and the total weight of the model is W, then:
W＝ρV (1)
ΔW＝ρΔVi (2)
W＝∑ΔWi (3)
from the resultant moment theorem, one can obtain:
Wxc＝∑ΔWixi (4)
Wyc＝∑ΔWiyi (5)
Wzc＝∑ΔWizi (6)
the barycentric coordinates obtained by equations (4) to (6) are:
as can be seen from FIG. 2, the coordinates of the part lifting hole 1 in the model are (x)1,y1,z1) The model is designed with a distance S, which is an assembly area of other parts and cannot be used for placing part lifting holes, so that the available area of the part lifting holes is L ═ y1-yc|-s。
When the nth suboptimal part lifting hole position is adopted, the available region L of the part lifting hole position is equally divided into (n +1) parts, and the ordinate y of the part lifting hole position1Is adjusted from the initial position to the C point direction each time
Wherein n is the optimization number of the position of the lifting hole of the part, n is 0,1,2,3 … n, m is the adjustment number of the position of the lifting hole of the part, m is 1,2,3 … n, and after each adjustment is finished, finite element simulation analysis is carried out until the simulation analysis result meets the assembly requirement.
The invention discloses a method for determining the position of a part lifting hole based on finite element simulation analysis, which comprises the following steps:
step 1, carrying out geometric cleaning, grid division, grid quality inspection, material and attribute establishment, material endowing, boundary condition and load application on parts in finite element simulation analysis software, and finally submitting calculation;
step 4, a simulation analysis result after the position of the part lifting hole is optimized for the first time can be obtained through the step 3, and if the result meets the precision requirements of design and assembly, the position of the part lifting hole does not need to be optimized; and if the result does not meet the precision requirements of design and assembly, repeating the step 2-3 until the simulation analysis result meets the precision requirements of design and assembly.
And 5, finally, determining the optimal position of the part lifting hole and putting the part lifting hole into use.
Wherein the assembly requirement is that the deformation displacement value of the part is not more than 0.0015 mm; the material property is a material density; the number of the part lifting holes is not less than 1,2, 4 or 6 can be selected, and 4 part lifting holes are arranged in the embodiment.
Additionally, for ease of use and operation, the finite element simulation analysis software includes HyperWorks, Ansys, and/or Nastran.
According to the invention, the part hoisting state is simulated through the finite element, the deformation of the part caused by hoisting in the assembling process is effectively predicted, the deformation of the part after hoisting is quantized, and the position of the part hoisting hole is optimized, so that the precision requirements of design and assembly are finally met, and the repair cost of the part is reduced.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A method for determining the position of a part lifting hole based on finite element simulation analysis is characterized in that: the method comprises the following steps:
s1: creating or importing a part model in finite element simulation analysis software, and carrying out finite element simulation analysis on the part model;
s2: obtaining a deformation displacement value generated in a part assembly area due to the initial position of a part lifting hole according to a finite element simulation analysis result, and formulating an optimization scheme of the position of the part lifting hole according to the deformation displacement value;
s3: adjusting the position of the part lifting hole in the part model according to the optimization scheme of the position of the part lifting hole, and performing finite element simulation analysis again according to the adjusted position of the part lifting hole;
s4: judging whether the deformation displacement value generated in the part assembly area due to the position of the part lifting hole meets the assembly requirement again according to the finite element simulation analysis result in the S3, and if the deformation displacement value meets the assembly requirement, not optimizing the position of the part lifting hole, wherein the current position is the optimal position of the part lifting hole; repeating S2-S3 if the assembly requirement is not met until the assembly requirement is met;
s5: and determining the optimal position of the part lifting hole according to the judgment result and putting the part lifting hole into use.
2. The method for determining the location of a lifting hole of a part based on finite element simulation analysis of claim 1, wherein: the optimization scheme specifically comprises the following steps:
when the nth suboptimum part lifting hole position is adopted, the available area of the part lifting hole position is divided into n +1 equal parts, and the part lifting hole position is adjusted towards the gravity center direction from the initial position every time
Wherein n is the number of times of optimizing the position of the component lifting hole, and n is 0,1,2,3 … n, m is the number of times of adjusting the position of the component lifting hole, and m is 1,2,3 … n; and after each adjustment is finished, carrying out finite element simulation analysis until the simulation analysis result meets the assembly requirement.
3. The method for determining the location of a lifting hole of a part based on finite element simulation analysis of claim 2, wherein: the finite element simulation analysis in S1 and/or S3 specifically includes geometric cleaning of parts, meshing, mesh quality inspection, material and attribute establishment, material assignment, and boundary condition and load application, and then the generated calculation file is submitted to software for calculation, and finally a finite element simulation analysis result is obtained.
4. The method for determining the location of a lifting hole of a part based on finite element simulation analysis of claim 3, wherein: the assembly requirement in S4 is that the part deformation displacement value is not more than 0.0015 mm.
5. The method for determining the location of a lifting hole of a part based on finite element simulation analysis of claim 4, wherein: the material property is a material density.
6. The method for determining the location of a lifting hole of a part based on finite element simulation analysis of claim 5, wherein: the number of the part lifting holes is not less than 1.
7. The method for determining the location of a lifting hole of a part based on finite element simulation analysis of claim 6, wherein: the finite element simulation analysis software includes HyperWorks, Ansys and/or Nastran.
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| CN202210036266.6A CN114372399A (en) | 2022-01-13 | 2022-01-13 | Method for determining position of part lifting hole based on finite element simulation analysis |
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| CN202210036266.6A CN114372399A (en) | 2022-01-13 | 2022-01-13 | Method for determining position of part lifting hole based on finite element simulation analysis |
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| CN202210036266.6A Pending CN114372399A (en) | 2022-01-13 | 2022-01-13 | Method for determining position of part lifting hole based on finite element simulation analysis |
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