CN103353907A - Calculating method of ultimate strength checking of connection of flange and bolt - Google Patents
Calculating method of ultimate strength checking of connection of flange and bolt Download PDFInfo
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- CN103353907A CN103353907A CN2013102400362A CN201310240036A CN103353907A CN 103353907 A CN103353907 A CN 103353907A CN 2013102400362 A CN2013102400362 A CN 2013102400362A CN 201310240036 A CN201310240036 A CN 201310240036A CN 103353907 A CN103353907 A CN 103353907A
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Abstract
The invention provides a calculating method of ultimate strength checking of connection of a flange and a bolt. The method comprises the following steps: sampling a finite element analysis software as a platform to conduct modeling, conducting mesh generation with a finite element, setting load of a connection structure and boundary conditions, and conducting calculation to obtain the stress condition of the bolt, wherein the setting of the load of the connection structure and the boundary conditions is particularly as follows: the relation between an upper flange and a lower flange is the standard friction contact relation in a model; a high strength gasket and a bolt nut, and a high strength gasket and a bolt screw cap are connected by adopting a conode way; the high strength gasket and the upper flange, and the high strength gasket and the lower flange are connected by adopting a binding contact manner; the structural node space coordinates system of a tower cylinder restraining the bottom end of the lower flange is the degree of freedom in three directions of X, Y, and Z; a node is built in the center of the upper flange, and is connected with the top end of a tower cylinder model by multipoint restriction of a beam element, and an ultimate working condition load is applied in the center of the upper flange; each connection bolt applies bolt pretension force. The bolt stress intensity and danger positions calculated by the method are higher in accuracy.
Description
Technical field
The invention belongs to technical field of wind power generation, the computing method that particularly relate to a kind of flange bolt Ship Ultimate Strength Analysis, be a kind of more universal method of checking the blower fan tower barrel flange bolt, can be widely used in the Ship Ultimate Strength Analysis of various structures blower fan tower barrel flange bolt.
Background technology
What Megawatt fan tower cylinder mainly adopted now is the conical tower cylinder of head tower formula, and each section tower cylinder connects with high-strength bolt by steel flanges.Whether the safety that connects high-strength bolt is directly connected to the safety of whole unit.Generally adopt Peterson's method (Petersen Method) that tower cylinder coupling bolt is carried out Ship Ultimate Strength Analysis on the engineering.The Petersen method does not consider that the bolt pretightening effect is on the impact of distortion.Bolt is only with the spring simulation, and predeformation is 0.Because spring does not bear Moment, the bolt that the Petersen method is calculated is not considered the impact of moment of flexure, and calculating is not accurate enough.The Petersen method adopts very large safety coefficient for bolt, has therefore remedied to a certain extent the out of true of calculating, and substantially conforms to experimental data; Because problem of boundary conditions, the Petersen method can only be checked tower cylinder interlude flange bolt, and can not check tower cylinder top and tower cylinder flange in the bottom coupling bolt; Simultaneously, the Petersen method is only suitable for L-type and T-shaped flange bolt type are checked, and can not check the special shape flange bolt.
Summary of the invention
For the problem of above-mentioned existence, the invention provides a kind of computing method more general, that be applicable to all blower fan flange bolt Ship Ultimate Strength Analysis.It calculates by finite element analysis software, to solve the Strength Safety problem of blower fan coupling bolt.
The objective of the invention is to be achieved through the following technical solutions:
The computing method of a kind of flange bolt Ship Ultimate Strength Analysis of the present invention, the sampling finite element analysis software is implemented modeling as platform, carrying out finite element grid divides, syndeton load and boundary condition are set, calculate, obtain the stressing conditions of bolt, described syndeton load and the boundary condition of arranging is specially: the rubbing contact relation that in the model between upper flange and the lower flange is standard; Adopt the conode mode to be connected between high-strength packing ring and bolt and nut, high-strength packing ring and the bolt nut; Adopt the binding way of contact to be connected between high-strength packing ring and upper flange, high-strength packing ring and the lower flange; Tower barrel structure node space coordinate system X, the Y of constraint lower flange bottom, the degree of freedom of three directions of Z; Set up node at the upper flange center and also be connected with tower cylinder model top by the multi-point constraint beam element, apply herein limiting condition load; Each coupling bolt all applies bolt pretightening.
Further, described modeling process is specially: use three-dimensional entity model to set up nut and the nut portion of upper and lower flange, part tower barrel structure, high-strength packing ring, high-strength bolt in finite element analysis software, wherein upper and lower flange, the part tower barrel structure model that is combined as a whole; Use the line unit to set up the screw portion of high-strength bolt.
Further, describedly flange bolt syndeton geometric model is carried out finite element grid divide, specific as follows: as to adopt hexahedral element to carry out grid for the 3D solid unit of each link geometric model and divide; Adopt three-dimensional beam element to simulate for the line unit, divide at grid, its area of section is the stress area of bolt.
Further, to carry out the unit that grid divides be 10～20mm to described hexahedral element.
Further, described three-dimensional beam element carries out grid to be divided, and each screw rod is divided into 15～20 subdivisions.
Further, the described limiting condition load that applies is by applying multistep LOAD FOR speed of convergence.
Further, described finite element model calculates to find the solution and adopts the non-linear computing method of finding the solution, and obtains bolt stress size and danger position, should be worth with the bolt allowable value and compare, and checks bolt strength.
Beneficial effect of the present invention is:
1. the present invention can carry out Ship Ultimate Strength Analysis to all positions of blower fan tower barrel and all types of flange bolt, and applicability is very wide.
2. computation process of the present invention is simple, is convenient to implement.
3. the present invention adopts hexahedral element to carry out the grid division for the 3D solid unit, can accelerate computing velocity and improve computational accuracy.
4. adopt syndeton load of the present invention and boundary condition setting, solve many windings by newton-La Pusen algorithm and touch nonlinear problem, and accelerate to calculate speed of convergence by applying multistep load, so that the size of the bolt stress after calculating and danger position accuracy are higher.
Description of drawings
Fig. 1 is the syndeton synoptic diagram of flange among the present invention.
Fig. 2 sets up the model synoptic diagram that boundary condition arranges among the present invention.
Among the figure: 1. nut, 2. upper flange, 3. screw rod, 4. lower flange, 5. packing ring, 6. nut
Embodiment
The present invention is described in detail below in conjunction with drawings and Examples.
Embodiment: computing method of the present invention adopt the ANSYS(finite element analysis software) be implementation tool, this example with certain blower fan tower barrel at the bottom of the method for flange bolt Ship Ultimate Strength Analysis be specifically described, flange connection as shown in Figure 1, its computing method comprise the steps:
The first step: set up flange bolt syndeton geometric model: use respectively solid model to set up nut 6 and nut 1 part of upper and lower flange 2,4, part tower barrel structure, high-strength packing ring 5, high-strength bolt in ANSYS software, wherein upper and lower flange 2,4, part tower barrel structure form integration model; Use the line unit to set up screw rod 3 parts of high-strength bolt.
Second step: flange bolt syndeton geometric model is carried out finite element grid divide: each link unit facilities sees table 1 for details; Adopt hexahedral element to carry out the grid division for the 3D solid unit in order to accelerate computing velocity and raising computational accuracy, simultaneously, cell size is 10～20mm; Adopt three-dimensional beam element to carry out grid for the line unit and divide, its area of section is the stress area of bolt, and simultaneously, each screw rod is divided into 15～20 subdivisions.
Table 1 finite element unit arranges
| Model part | Cell type | Cell type | Crucial option |
| Upper flange | Solid185 | The 3D solid unit | Nothing |
| Lower flange | Solid185 | The 3D solid unit | Nothing |
| The tower barrel structure | Solid185 | The 3D solid unit | Nothing |
| Screw rod | Beam188 | Three-dimensional beam element | Nothing |
| Nut | Solid185 | The 3D solid unit | Nothing |
| Nut | Solid185 | The 3D solid unit | Nothing |
The 3rd step: syndeton load and boundary condition setting: in the model between upper flange 2 and the lower flange 4 rubbing contact of definition standard concern (standard), rub and examine coefficient and get 0.2; Adopt the conode mode to be connected between high-strength packing ring 5 and bolt and nut 1, high-strength packing ring 5 and the bolt nut 6; Adopt the binding way of contact to be connected between high-strength packing ring 5 and upper flange 2, high-strength packing ring 5 and the lower flange 4; The degree of freedom of constraint lower flange 4 bottom tower barrel structure node space coordinate system X, Y, three directions of Z in the analysis; Set up node at upper flange 2 centers and also be connected with pylon model top by multi-point constraint beam element (MPC), apply herein limiting condition load; Each coupling bolt all applies pretightning force according to set-point; It is bolt standard pretightning force value.
The 4th step: finite element model calculates finds the solution and check the result: adopt the ANSYS finite element software, by newton-La Pusen algorithm, carry out nonlinear analysis and calculate, the described limiting condition load that applies is to accelerate to calculate speed of convergence by applying multistep load; Show bolt stress size and danger position after calculating, should value and the bolt allowable value more just can check bolt strength.
Claims (7)
1. the computing method of a flange bolt Ship Ultimate Strength Analysis, the sampling finite element analysis software is implemented modeling as platform, carrying out finite element grid divides, syndeton load and boundary condition are set, calculate, obtain the stressing conditions of bolt, it is characterized in that: described syndeton load and the boundary condition of arranging is specially: the rubbing contact relation that in the model between upper flange and the lower flange is standard; Adopt the conode mode to be connected between high-strength packing ring and bolt and nut, high-strength packing ring and the bolt nut; Adopt the binding way of contact to be connected between high-strength packing ring and upper flange, high-strength packing ring and the lower flange; Tower barrel structure node space coordinate system X, the Y of constraint lower flange bottom, the degree of freedom of three directions of Z; Set up node at the upper flange center and also be connected with tower cylinder model top by the multi-point constraint beam element, apply herein limiting condition load; Each coupling bolt all applies bolt pretightening.
2. the computing method of flange bolt Ship Ultimate Strength Analysis as claimed in claim 1, it is characterized in that: described modeling process is specially: use three-dimensional entity model to set up nut and the nut portion of upper and lower flange, part tower barrel structure, high-strength packing ring, high-strength bolt in finite element analysis software, wherein upper and lower flange, the part tower barrel structure model that is combined as a whole; Use the line unit to set up the screw portion of high-strength bolt.
3. the computing method of flange bolt Ship Ultimate Strength Analysis as claimed in claim 1, it is characterized in that: describedly flange bolt syndeton geometric model is carried out finite element grid divide, specific as follows: as to adopt hexahedral element to carry out grid for the 3D solid unit of each link geometric model and divide; Adopt three-dimensional beam element to simulate for the line unit, divide at grid, its area of section is the stress area of bolt.
4. the computing method of flange bolt Ship Ultimate Strength Analysis as claimed in claim 3 is characterized in that: it is 10～20mm that described hexahedral element carries out the unit that grid divides.
5. the computing method of flange bolt Ship Ultimate Strength Analysis as claimed in claim 3, it is characterized in that: described three-dimensional beam element carries out grid to be divided, and each screw rod is divided into 15～20 subdivisions.
6. the computing method of flange bolt Ship Ultimate Strength Analysis as claimed in claim 1, it is characterized in that: the described limiting condition load that applies is by applying multistep LOAD FOR speed of convergence.
7. the computing method of flange bolt Ship Ultimate Strength Analysis as claimed in claim 1, it is characterized in that: described finite element model calculates to find the solution and adopts the non-linear computing method of finding the solution, obtain bolt stress size and danger position, should be worth with the bolt allowable value and compare, check bolt strength.
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| CN2013102400362A CN103353907A (en) | 2013-06-17 | 2013-06-17 | Calculating method of ultimate strength checking of connection of flange and bolt |
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| CN105631061A (en) * | 2014-10-29 | 2016-06-01 | 北京临近空间飞行器***工程研究所 | Dynamics modeling method of complex point type connection structure |
| CN105701296A (en) * | 2016-01-14 | 2016-06-22 | 东南大学 | Finite element modeling method of racetrack-shaped bolted connection structure |
| CN105740550A (en) * | 2016-02-01 | 2016-07-06 | 北京汽车股份有限公司 | Fastened connector simulation method during safety belt fixed point strength analysis |
| CN107169162A (en) * | 2017-04-13 | 2017-09-15 | 明阳智慧能源集团股份公司 | A kind of bolt strength simplified calculation method |
| CN107506563A (en) * | 2017-09-29 | 2017-12-22 | 江苏银基烯碳能源科技有限公司 | The evaluation method and system of a kind of bolt strength |
| CN107563085A (en) * | 2017-09-12 | 2018-01-09 | 国电联合动力技术有限公司 | The finite element modeling method and strength assessment method of a kind of high-strength bolt attachment structure |
| CN107810525A (en) * | 2015-04-30 | 2018-03-16 | 内部科技有限责任公司 | Node mesh generation for trellis |
| CN108038327A (en) * | 2017-12-22 | 2018-05-15 | 中车唐山机车车辆有限公司 | Strength values analogy method, device and the terminal device of bolt |
| CN108170942A (en) * | 2017-12-26 | 2018-06-15 | 北京无线电测量研究所 | A kind of finite element modeling system and method for bolt fastening structure |
| CN108871745A (en) * | 2018-05-10 | 2018-11-23 | 哈尔滨电气股份有限公司 | It is a kind of without cone cervical approach orchid strength check methods |
| CN109726412A (en) * | 2017-10-31 | 2019-05-07 | 北京万源工业有限公司 | A kind of check method of flange bolt fatigue strength |
| CN110008540A (en) * | 2019-03-20 | 2019-07-12 | 东南大学 | A kind of bay section docking under basic excitation is bolted loosening analogy method |
| CN110059381A (en) * | 2019-04-03 | 2019-07-26 | 西安飞机工业（集团）有限责任公司 | A kind of taper faced washer finite element method |
| CN110348151A (en) * | 2019-07-17 | 2019-10-18 | 国电联合动力技术有限公司 | Wind turbines tower drum flange connects bolt design method and device |
| CN110795875A (en) * | 2019-10-14 | 2020-02-14 | 太原科技大学 | Fan shaft-gear box flange connection checking method |
| CN111339639A (en) * | 2020-02-12 | 2020-06-26 | 合肥市市政设计研究总院有限公司 | Flange connection node analysis method based on model iterative correction |
| CN111400948A (en) * | 2020-03-16 | 2020-07-10 | 中国航天空气动力技术研究院 | Finite element calculation method for stress borne by stress release bolt |
| CN112199797A (en) * | 2020-10-28 | 2021-01-08 | 北奔重型汽车集团有限公司 | Modeling calculation method of bolt structure |
| CN112699509A (en) * | 2021-01-08 | 2021-04-23 | 北京工业大学 | Method for checking ultimate strength of flange connecting bolt |
| CN113239456A (en) * | 2021-04-16 | 2021-08-10 | 中国第一汽车股份有限公司 | Design method for fastening load of fuel bottle of passenger vehicle |
| CN113297700A (en) * | 2021-06-05 | 2021-08-24 | 德力佳传动科技(江苏)有限公司 | Method for checking strength of turning lifting lug of wind power gear box |
| CN113434974A (en) * | 2021-06-23 | 2021-09-24 | 海洋石油工程股份有限公司 | Method for analyzing strength of offshore fixed platform upper module and floating support structure thereof |
| WO2023092619A1 (en) * | 2021-11-26 | 2023-06-01 | 中车长春轨道客车股份有限公司 | Method for checking pre-tightening force of dissimilar metal connecting bolt in ultra-cryogenic condition on basis of simplified modeling |
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| CN113297700B (en) * | 2021-06-05 | 2022-02-22 | 德力佳传动科技(江苏)有限公司 | Method for checking strength of turning lifting lug of wind power gear box |
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