CN112528393A - Ship shafting connecting flange dynamics analysis modeling method - Google Patents

Ship shafting connecting flange dynamics analysis modeling method Download PDF

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Publication number
CN112528393A
CN112528393A CN202011223098.9A CN202011223098A CN112528393A CN 112528393 A CN112528393 A CN 112528393A CN 202011223098 A CN202011223098 A CN 202011223098A CN 112528393 A CN112528393 A CN 112528393A
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bolt
flange
modeling method
finite element
connecting flange
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CN112528393B (en
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李聪
叶帆
石慧
赵超
王伟
朱青淳
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708th Research Institute of CSIC
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708th Research Institute of CSIC
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/15—Vehicle, aircraft or watercraft design
    • G—PHYSICS
    • 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]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2111/00—Details relating to CAD techniques
    • G06F2111/04—Constraint-based CAD
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • 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

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  • Computational Mathematics (AREA)
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  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)

Abstract

The invention provides a dynamic analysis modeling method for a ship shafting connecting flange. The invention establishes the finite element model of the flange and the bolt through hole by the body unit, and can accurately and finely express the geometric characteristics of the flange joint. The connection between the bolts and the bolt through hole surfaces is simulated through multi-point rigid constraint, the rigidity characteristic of the three-way spring unit equivalent flange plate bolt connection is adopted, the detailed dynamic characteristic of the connecting flange can be effectively simulated through the modeling mode, and the method can be realized on various commercial limited analysis software. Finally, the three-dimensional force extracted by the modeling mode provided by the invention can be used as a design input load for checking the strength of the bolt, so that the complex three-dimensional coupling modeling of the bolt and the flange is avoided on the premise of ensuring the engineering precision requirement, and meanwhile, the structural strength of the flange body can also be directly analyzed.

Description

Ship shafting connecting flange dynamics analysis modeling method
Technical Field
The invention relates to a ship shafting connecting flange dynamics analysis modeling method, and belongs to the technical field of ship structural engineering.
Background
The dynamic analysis of the ship shafting generally adopts a beam unit to carry out finite element modeling on the shafting structure, a support structure of the shafting utilizes a spring unit to simulate corresponding rigidity, although the integral dynamic response result of the shafting obtained by the method can meet the requirement of engineering precision, the shafting beam model is difficult to effectively carry out the thinning analysis of the local strength of the shafting due to the simplification and the limitation of an equivalent mode, such as the calculation of the local contact stress of a bearing and the shafting, the strength check of a flange bolt and the like. The dynamic strength analysis of the flange connecting bolt is a key link for ensuring the normal operation of the shafting under the action of transient load.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the current dynamic analysis is difficult to effectively carry out the thinning analysis of the shafting local strength.
In order to solve the technical problems, the technical scheme of the invention is to provide a ship shafting connecting flange dynamics analysis modeling method, which is characterized by comprising the following steps:
step 1, establishing three-dimensional geometric models of flanges at two sides of a bolt connection part, wherein the three-dimensional geometric model of the flange at each side comprises bolt through holes uniformly distributed on a pitch circle of the flange, and the position of each bolt through hole on the flange is the bolt connection part of the current flange;
step 2, dividing the three-dimensional geometric model of each side flange plate into finite element grids by using a body unit, thereby establishing the finite element model of each side flange plate and the finite element model of each bolt through hole on the flange plate;
step 3, simulating the connection of the bolt and the surface of a finite element model with bolt through holes by using multipoint rigid constraint at each bolt connection part of each side flange plate, wherein the rigidity characteristics of the connection of the flange plates at two sides and the bolt are respectively equivalent by N-direction spring units, and N is more than or equal to 2;
and 4, under the action of transient load, taking N-direction force of the N-direction spring units as input load for checking tensile strength and shearing strength of the bolts, wherein the N-direction force comprises the tensile rigidity of the bolts and the shearing rigidity of the bolts, simultaneously directly reading the stress of each grid unit of the finite element models of the flange plates at two sides, and analyzing the structural strength of the flange plate bodies at two sides.
Preferably, in step 3, simulating the connection of the bolt and the bolt perforation surface by multipoint rigid constraint specifically includes the following steps:
and establishing the multipoint rigid constraint of the reference point and the surface node of the finite element model of the current bolt perforation by taking the set position of the bolt perforation as the reference point.
Preferably, the set position of the bolt penetration hole is a center of the bolt penetration hole.
Preferably, in step 3, the rigidity characteristics of the connection between the flanges at the two sides and the bolts are respectively equivalent to the characteristics of an N-direction spring unit, and specifically includes the following steps:
and establishing the N-direction spring unit connecting the preset positions of the two bolt through holes for the finite element models of the two bolt through holes of which the flange plates at two sides correspond to the same bolt.
Preferably, the preset position is a center of the bolt penetration hole.
Preferably, in step 4, under the action of the transient load, the three-way force of the spring unit is the three-way interface force at the bolt perforation.
Preferably, the N-direction spring unit in step 3 is a three-way spring unit.
Preferably, in step 4, the stiffness in the axial direction of the three-way force of the three-way spring unit is the tensile stiffness of the bolt.
Preferably, in step 4, the stiffness of the three-way force of the three-way spring unit in the other two directions except the stiffness in the axial direction is the shear stiffness of the bolt.
The ship shafting connecting flange dynamics analysis modeling method provided by the invention can effectively analyze and evaluate the strength of the flange plate and the connecting bolt. Compared with the prior art, the invention has the following advantages:
a finite element model of the flange plate and the bolt through hole is established by the body unit, and the geometric characteristics of the flange plate connecting part can be accurately and finely expressed. The connection between the bolts and the bolt through hole surfaces is simulated through multi-point rigid constraint, the rigidity characteristic of the three-way spring unit equivalent flange plate bolt connection is adopted, the detailed dynamic characteristic of the connecting flange can be effectively simulated through the modeling mode, and the method can be realized on various commercial limited analysis software. Finally, the three-dimensional force extracted by the modeling mode provided by the invention can be used as a design input load for checking the strength of the bolt, so that the complex three-dimensional coupling modeling of the bolt and the flange is avoided on the premise of ensuring the engineering precision requirement, and meanwhile, the structural strength of the flange body can also be directly analyzed.
Drawings
FIG. 1 is a finite element mesh model of a flange disk body unit;
FIG. 2 is a schematic view of multi-point rigid constraint of a node on a perforated surface of a flange bolt;
FIG. 3 is a schematic view of a three-way spring connection of a flange;
FIG. 4 is a stress cloud of structural strength of the flange body;
fig. 5 is a graph of the three-way force of the spring unit.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The invention provides a ship shafting connecting flange dynamics analysis modeling method which is characterized by comprising the following steps:
step 1, establishing a three-dimensional geometric model of flanges at two sides of a bolt connection part. The three-dimensional geometric model of each side flange plate comprises bolt through holes 2 which are uniformly distributed on a pitch circle, and the position of each bolt through hole 2 on the flange plate is each bolt connection position of the current flange plate.
And 2, dividing the three-dimensional geometric model of each side flange plate into finite element grids by using a body unit, thereby establishing a finite element model 1 of each side flange plate and a finite element model of each bolt through hole 2 on the flange plate, as shown in fig. 1.
Step 3, at each bolt connection position of the flange plate on each side:
simulating the connection of the bolt to the bolt-pierced finite element model surface with multipoint rigid constraints, comprising the steps of:
as shown in fig. 2, taking the center of the bolt perforation 2 as a reference point, establishing a multipoint rigid constraint 3 of the reference point and a surface node of the finite element model of the current bolt perforation;
the rigidity characteristics of the flange plates at two sides and the bolt connection are respectively equivalent by a three-way spring unit, and the method comprises the following steps:
and establishing a three-way spring unit 4 for connecting the centers of the two bolt through holes 2 for the finite element models of the two bolt through holes 2 of which the flange plates on the two sides correspond to the same bolt.
Step 4, as shown in fig. 4, under the action of the transient load, the strength of the flange plate body can be directly analyzed by using the modeling method; taking the three-way force of the three-way spring unit 4 as an input load for checking the tensile and shear strengths of the bolt, wherein the rigidity along the axial direction is the tensile rigidity of the bolt, and the rigidities along the other two directions are the shear rigidities of the bolt; the three-way force of the three-way spring unit 4 is extracted as an input load for checking the tensile and shear strength of the bolt, as shown in fig. 5.

Claims (9)

1. A ship shafting connecting flange dynamics analysis modeling method is characterized by comprising the following steps:
step 1, establishing three-dimensional geometric models of flanges at two sides of a bolt connection part, wherein the three-dimensional geometric model of the flange at each side comprises bolt through holes uniformly distributed on a pitch circle of the flange, and the position of each bolt through hole on the flange is the bolt connection part of the current flange;
step 2, dividing the three-dimensional geometric model of each side flange plate into finite element grids by using a body unit, thereby establishing the finite element model of each side flange plate and the finite element model of each bolt through hole on the flange plate;
step 3, simulating the connection of the bolt and the surface of a finite element model with bolt through holes by using multipoint rigid constraint at each bolt connection part of each side flange plate, wherein the rigidity characteristics of the connection of the flange plates at two sides and the bolt are respectively equivalent by N-direction spring units, and N is more than or equal to 2;
and 4, under the action of transient load, taking N-direction force of the N-direction spring units as input load for checking tensile strength and shearing strength of the bolts, wherein the N-direction force comprises the tensile rigidity of the bolts and the shearing rigidity of the bolts, simultaneously directly reading the stress of each grid unit of the finite element models of the flange plates at two sides, and analyzing the structural strength of the flange plate bodies at two sides.
2. The ship shafting connecting flange dynamics analysis modeling method according to claim 1, wherein in the step 3, simulating the connection between the bolt and the bolt through hole surface by using multipoint rigidity constraint specifically comprises the following steps:
and establishing the multipoint rigid constraint of the reference point and the surface node of the finite element model of the current bolt perforation by taking the set position of the bolt perforation as the reference point.
3. The dynamic analysis modeling method for the marine shafting connecting flange according to claim 3, wherein the set position of the bolt through hole is the center of the bolt through hole.
4. The ship shafting connecting flange dynamics analysis modeling method according to claim 1, wherein in the step 3, the rigidity characteristics of the connection between the flanges at two sides and the bolts are respectively equivalent by N-direction spring units, and the method specifically comprises the following steps:
and establishing the N-direction spring unit connecting the preset positions of the two bolt through holes for the finite element models of the two bolt through holes of which the flange plates at two sides correspond to the same bolt.
5. The dynamic analysis modeling method for the marine shafting connecting flange according to claim 4, wherein the preset position is the center of the bolt through hole.
6. The dynamic analysis and modeling method for the marine shafting connecting flange according to claim 1, wherein in the step 4, under the action of the transient load, the three-way force of the spring unit is the three-way interface force at the bolt penetration position.
7. The ship shafting connecting flange dynamics analysis modeling method according to claim 1, wherein in the step 3, the N-direction spring unit is a three-way spring unit.
8. The dynamic analysis modeling method for the marine shafting connecting flange according to claim 7, wherein in the step 4, the rigidity in the axial direction in the three-way force of the three-way spring unit is the tensile rigidity of the bolt.
9. The dynamic analytic modeling method for marine shafting connecting flange according to claim 8, wherein in step 4, the stiffnesses of the three-way force of the three-way spring unit in the other two directions except the stiffness in the axial direction are the shear stiffness of the bolt.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113128000A (en) * 2021-05-13 2021-07-16 江南造船(集团)有限责任公司 Method for evaluating stress and rigidity of double-wall pipe flange

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CN106295024A (en) * 2016-08-15 2017-01-04 北京航空航天大学 A kind of compound material bolt considering gap and frictional influence connects load distribution calculation method
CN106991230A (en) * 2017-03-30 2017-07-28 中国航空工业集团公司西安飞机设计研究所 A kind of FEM model method for simplifying of flange arrangement
CN109018188A (en) * 2018-07-16 2018-12-18 江苏科技大学 A kind of wavy period buoyant raft of annular and preparation method thereof

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CN104156498A (en) * 2014-05-26 2014-11-19 北京宇航系统工程研究所 Finite element method and strength evaluation method for bolt
US20160364512A1 (en) * 2015-06-09 2016-12-15 The Boeing Company Modeling holes and fasteners for finite element analysis
CN106295024A (en) * 2016-08-15 2017-01-04 北京航空航天大学 A kind of compound material bolt considering gap and frictional influence connects load distribution calculation method
CN106991230A (en) * 2017-03-30 2017-07-28 中国航空工业集团公司西安飞机设计研究所 A kind of FEM model method for simplifying of flange arrangement
CN109018188A (en) * 2018-07-16 2018-12-18 江苏科技大学 A kind of wavy period buoyant raft of annular and preparation method thereof

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113128000A (en) * 2021-05-13 2021-07-16 江南造船(集团)有限责任公司 Method for evaluating stress and rigidity of double-wall pipe flange

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