CN104992039A - Calculation method of pressure during conical-surface oil-pressure interference installation process - Google Patents
Calculation method of pressure during conical-surface oil-pressure interference installation process Download PDFInfo
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- CN104992039A CN104992039A CN201510470725.1A CN201510470725A CN104992039A CN 104992039 A CN104992039 A CN 104992039A CN 201510470725 A CN201510470725 A CN 201510470725A CN 104992039 A CN104992039 A CN 104992039A
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Abstract
The invention relates to a calculation method of a pressure during a conical-surface oil-pressure interference installation process. The method comprises the following steps: step 1, establishing a three-dimensional model of conical-surface interference installation; step 2, carrying out finite-element grid division on the three-dimensional model; step 3, setting a contact pair and adjusting an initial contact state; step 4, selecting a contact algorithm of a finite element analysis; step 5, carrying out constraint and load application on the three-dimensional model; and step 6, checking an overall simulation process and result by using a postprocessor of the finite element analysis, and obtaining a curve of changes of an axial press-in force and a radial contact pressure with a pull-up amount during the installation process. According to the invention, the part three-dimensional model is established according an actual dimension and finite-element non-linear contact calculation is carried out by using an enhanced lagrangian method so as to obtain the axial press-in force and the radial contact pressure; and the calculation based on the finite-element method is precise and reliable; and a theoretical basis is provided for accurate oil pressure application during the conical-surface interference installation process.
Description
Technical field
The present invention relates to the computing method of pressure in a kind of circular conical surface oil pressure interference installation process.
Background technology
Current circular conical surface oil pressure interference is installed generally employing pressing machine and hydraulic oil is passed into the oil-feed annular groove between external member and internal member faying face, applying radial oil pressure can make external member and internal member at faying face place, elastic deformation occur and form gap, and on the end face of external member, apply axial pressing-in force simultaneously, make external member and internal member that relative axial displacement occur, after displacement to axial between part reaches the position required by circular conical surface interference installation, first cut off the radial oil pressure in the enterprising oil ring groove of faying face, and then the axial pressing-in force stopping part end face applying, finally complete the interference of circular conical surface oil pressure to install.Owing to faying face can not paste foil gauge when the interference of circular conical surface oil pressure is installed, be difficult to carry out actual measurement to the numerical value of axial pressing-in force and radial contact, therefore based on the thick-cylinder theory in engineering generally in Elasticity, the axial pressing-in force installed according to the formulae discovery circular conical surface interference in mechanical handbook and radial contact, obtain axial oil pressure in installation process, the relation curve of radial oil pressure and the amount of pushing, oil pressure interference installation is carried out to part, but now axial pressing-in force and radial contact calculate under certain assumed condition: the strain of part is in elastic range, external member and internal member are two equal length thick cyclinders, and interface pressure is uniformly distributed, space three-dimensional stress is reduced to planar stress state, namely axial stress equals zero, when using thick-cylinder theory calculating radial pressure and axle pressure in Elasticity, circular conical surface interference is connected the thick cyclinder being reduced to two equal lengths calculate under the state of plane stress, there is deviation in theoretical value and the actual value of radial contact and axial pressing-in force, therefore Elasticity method is used to calculate axial pressing-in force and radial contact not enough accurately and perfect, this applies axial oil pressure accurately when installing the interference of circular conical surface oil pressure and radial oil pressure plays vital impact.
Summary of the invention
Technical matters to be solved by this invention is that the deficiency existed for above-mentioned prior art provides a kind of circular conical surface oil pressure interference installation shaft that can improve accuracy in computation to the computing method of pressing-in force and radial contact.
The technical solution adopted in the present invention is: the computing method of pressure in a kind of circular conical surface oil pressure interference installation process, is characterized in that: it comprises the steps:
Step 1, solid modelling, according to circular cone cover parts to be assembled and circular cone axial workpiece physical size parameter, set up the three-dimensional entity model figure of circular conical surface oil pressure elastic conjunction;
Step 2, FEM meshing is carried out to the three-dimensional model of Assembly of the parts;
The contact of step 3, three-dimensional model is to setting and the adjustment of initial contact state, target face when calculating by specifying circular conical surface interference installation in the contact mange-ment device of finite element software pre-treatment and surface of contact, and real constant is set in contact mange-ment device, select gradual change to apply to offset by surface of contact cause initial partially saturating, make the initial contact state of three-dimensional model after stress and strain model for contact completely;
Step 4, the interference of selection circular conical surface oil pressure are provided with the Contact Algorithm of finite element analysis, and the Lagrangian method of selective enhancement is carried out Nonlinear FEM contact and calculated;
Step 5, displacement constraint and imposed load are carried out to the three-dimensional model carrying out the interference of circular conical surface oil pressure and be provided with finite element analysis;
Step 6, according to the setting in the finite element software pre-treatment of step 1 ~ 5, carry out Nonlinear FEM contact to calculate, by the preprocessor of finite element analysis, check that whole simulation process and result are installed in the interference of circular conical surface oil pressure, obtain the curve of axial pressing-in force and radial contact in installation process.
By technique scheme, circular cone cover parts to be assembled and circular cone axial workpiece are screw propeller and propeller shaft.
By technique scheme, described step 1 is: three-dimensional model, for just to contact completely, is directly imported computational analysis in finite element software by the faying face setting up the three-dimensional model of circular conical surface elastic conjunction in three-dimensional drawing software.
By technique scheme, step 2 is specially: use the stress and strain model instrument in finite element software, selects to generate hexahedral element grid by the three-dimensional model of Assembly of the parts.
By technique scheme, in described step 3, the faying face that chosen material elastic modulus is large is target face, and the faying face that chosen material elastic modulus is little is surface of contact.
By technique scheme, in step 5 to the detailed process that three-dimensional model carries out displacement constraint and imposed load be: apply displacement staff cultivation by the end face of internal member, be fixed and can not be moved and rotate, the end face of external member applies displacement load, to simulate the push-on process that the interference of circular conical surface part is installed.
Beneficial effect acquired by the present invention is: the present invention contacts calculating acquisition by adopting the Lagrangian method strengthened to carry out Nonlinear FEM to the axial pressing-in force of circular conical surface elastic conjunction and radial contact, its numerical value changes along with the change of the amount of pushing in actual interference installation process, the Lagrangian method strengthened is combined at penalty function method and Lagrangian method, start according to penalty function method at the process Program calculated, similar with pure Lagrangian method, ceaselessly upgrade the penalty function of contact stiffness, until the penetrating value calculated is less than permissible value, contribute to like this reducing morbid state, not restriction on selection solver, freely can also control the penetrating value allowed, overcome and use Elasticity method to calculate brought impact under certain assumed condition, the calculating of axial pressing-in force and radial contact uses finite element method than Elasticity method accurately and reliably, the axial pressing-in force solved and radial contact can be transformed axial oil pressure and radial oil pressure by simple theoretical formula, for when the interference of circular conical surface oil pressure is installed, the determination of the axial oil pressure of required applying and radial oil pressure provides certain theoretical foundation.
Accompanying drawing explanation
Fig. 1 and Fig. 2 is respectively the embodiment provided by the invention curve map that axial pressing-in force and radial contact change with the amount of pushing in interference installation process.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
The process that this embodiment is installed with the interference of keyless propeller oil pressure is described, and the determination of its axial pressing-in force and radial contact comprises the following steps:
Step 1: set up the three-dimensional model that circular conical surface interference is installed, according to the physical size parameter of screw propeller and propeller shaft, use the three-dimensional model of three-dimensional drawing Software on Drawing oar-axle elastic conjunction, because model belongs to Space Axisymmetric, therefore set up 1/4 oar-axle elastic conjunction three-dimensional model;
Step 2: the stress and strain model of three-dimensional model, according to the size of screw propeller and propeller shaft, in guarantee computational accuracy under saving the condition of computing time, the mesh shape of setting unit and size of mesh opening, use the stress and strain model instrument in finite element software, carry out hexahedral mesh division to the three-dimensional model of oar-axle elastic conjunction, the unit size of stress and strain model is 5mm;
Step 3: the contact of three-dimensional model is to setting and the adjustment of initial contact state, because screw propeller is different with the rigidity of propeller shaft material, the propeller shaft outside surface selecting rigidity larger is target face, and the screw propeller surface selecting rigidity less is surface of contact; The faying face of oar during three-dimension modeling-axle elastic conjunction is for just to contact completely, but three-dimensional model is after carrying out FEM meshing, the faying face of oar-axle there will be and be interrupted discontinuous situation, in the contact mange-ment device of finite element software pre-treatment, real constant is set, gradual change is selected to apply and that surface of contact skew causes is initial partially saturating, make three-dimensional model after stress and strain model, the faying face initial contact state of screw propeller and propeller shaft is for just to contact completely;
Step 4: select the interference of circular conical surface oil pressure to be provided with the Contact Algorithm of finite element analysis, the interference of keyless propeller oil pressure is installed and is belonged to Nonlinear FEM contact, and the three-dimensional model of Lagrangian method to oar-axle elastic conjunction of selective enhancement carries out Nonlinear FEM contact and calculate;
Step 5: displacement constraint and imposed load are carried out to the three-dimensional model carrying out circular conical surface oil pressure interference installation, constraint and the imposed load on keyless propeller oil pressure interference installation border are as follows:
I: the end face arranging analytical model propeller shaft applies full displacement constraint and is fixed, the simulation push-on process Center Screw Shaft preventing screw propeller interference from installing rotates or displacement;
II: the end face arranging analytical model screw propeller applies displacement load, and install the amount of pushing required for reality according to screw propeller interference, the displacement load arranging applying equals the amount of pushing;
III: arranging analysis type is large deformations;
Step 6: according to the setting in the finite element software pre-treatment of step 1 ~ 5, carry out Nonlinear FEM contact to calculate, by the preprocessor of finite element software, check the whole simulation process that the interference of keyless propeller oil pressure is installed and result, as depicted in figs. 1 and 2, in interference installation process axial pressing-in force (because three-dimensional model is 1/4, total axial pressing-in force be in figure 4 times) and the curve that changes with the amount of pushing of radial contact.
Claims (6)
1. the computing method of pressure in circular conical surface oil pressure interference installation process, is characterized in that:
Step 1, solid modelling, according to circular cone cover parts to be assembled and circular cone axial workpiece physical size parameter, set up the three-dimensional entity model figure of circular conical surface oil pressure elastic conjunction;
Step 2, FEM meshing is carried out to the three-dimensional model of Assembly of the parts;
The contact of step 3, three-dimensional model is to setting and the adjustment of initial contact state, target face when calculating by specifying circular conical surface interference installation in the contact mange-ment device of finite element software pre-treatment and surface of contact, and real constant is set in contact mange-ment device, select gradual change to apply to offset by surface of contact cause initial partially saturating, make the initial contact state of three-dimensional model after stress and strain model for contact completely;
Step 4, the interference of selection circular conical surface oil pressure are provided with the Contact Algorithm of finite element analysis, and the Lagrangian method of selective enhancement is carried out Nonlinear FEM contact and calculated;
Step 5, displacement constraint and imposed load are carried out to the three-dimensional model carrying out the interference of circular conical surface oil pressure and be provided with finite element analysis;
Step 6, according to the setting in the finite element software pre-treatment of step 1 ~ 5, carry out Nonlinear FEM contact to calculate, by the preprocessor of finite element analysis, check that whole simulation process and result are installed in the interference of circular conical surface oil pressure, obtain the curve of axial pressing-in force and radial contact in installation process.
2. the computing method of pressure in a kind of circular conical surface oil pressure interference installation process according to claim 1, it is characterized in that, circular cone cover parts to be assembled and circular cone axial workpiece are screw propeller and propeller shaft.
3. the computing method of pressure in a kind of circular conical surface oil pressure interference installation process according to claim 1 and 2, it is characterized in that, described step 1 is: three-dimensional model, for just to contact completely, is directly imported computational analysis in finite element software by the faying face setting up the three-dimensional model of circular conical surface elastic conjunction in three-dimensional drawing software.
4. the computing method of pressure in a kind of circular conical surface oil pressure interference installation process according to claim 1 and 2, it is characterized in that, step 2 is specially: use the stress and strain model instrument in finite element software, selects to generate hexahedral element grid by the three-dimensional model of Assembly of the parts.
5. the computing method of pressure in a kind of circular conical surface oil pressure interference installation process according to claim 1 and 2, it is characterized in that, in described step 3, the faying face that chosen material elastic modulus is large is target face, and the faying face that chosen material elastic modulus is little is surface of contact.
6. the computing method of pressure in a kind of circular conical surface oil pressure interference installation process according to claim 1 and 2, it is characterized in that, in step 5 to the detailed process that three-dimensional model carries out displacement constraint and imposed load be: apply displacement staff cultivation by the end face of internal member, be fixed and can not be moved and rotate, the end face of external member applies displacement load, to simulate the push-on process that the interference of circular conical surface part is installed.
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| CN106354920A (en) * | 2016-08-26 | 2017-01-25 | 中车株洲电力机车研究所有限公司 | Strength analysis method and magnitude of interference analysis method of main bearing and shaft sleeve in wind turbine generator |
| CN111027241A (en) * | 2019-11-20 | 2020-04-17 | 广州机械科学研究院有限公司 | Method and device for measuring and calculating radial force of oil seal with spring based on finite element method |
| CN111523274A (en) * | 2020-03-18 | 2020-08-11 | 上海发电设备成套设计研究院有限责任公司 | Method for constructing digital twin body of high-temperature pressure-bearing part of steam turbine and monitoring system |
| CN112685925A (en) * | 2019-10-18 | 2021-04-20 | 比亚迪股份有限公司 | Method and device for establishing model, storage medium and electronic equipment |
| CN114379738A (en) * | 2022-02-23 | 2022-04-22 | 理工造船(鄂州)股份有限公司 | Key-free hydraulic connection installation method for propeller |
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| CN106354920A (en) * | 2016-08-26 | 2017-01-25 | 中车株洲电力机车研究所有限公司 | Strength analysis method and magnitude of interference analysis method of main bearing and shaft sleeve in wind turbine generator |
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| CN112685925A (en) * | 2019-10-18 | 2021-04-20 | 比亚迪股份有限公司 | Method and device for establishing model, storage medium and electronic equipment |
| CN111027241A (en) * | 2019-11-20 | 2020-04-17 | 广州机械科学研究院有限公司 | Method and device for measuring and calculating radial force of oil seal with spring based on finite element method |
| CN111523274A (en) * | 2020-03-18 | 2020-08-11 | 上海发电设备成套设计研究院有限责任公司 | Method for constructing digital twin body of high-temperature pressure-bearing part of steam turbine and monitoring system |
| CN114379738A (en) * | 2022-02-23 | 2022-04-22 | 理工造船(鄂州)股份有限公司 | Key-free hydraulic connection installation method for propeller |
| CN114379738B (en) * | 2022-02-23 | 2022-12-13 | 理工造船(鄂州)股份有限公司 | Propeller keyless hydraulic coupling installation method |
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