CN104392038A - Finite element modeling method of flexible liquid injection structure for different media - Google Patents
Finite element modeling method of flexible liquid injection structure for different media Download PDFInfo
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- CN104392038A CN104392038A CN201410664415.9A CN201410664415A CN104392038A CN 104392038 A CN104392038 A CN 104392038A CN 201410664415 A CN201410664415 A CN 201410664415A CN 104392038 A CN104392038 A CN 104392038A
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Abstract
The invention relates to the field of the airplane structural mechanics analysis, in particular to a finite element modeling method of a flexible liquid injection structure for different media. The method includes the steps of establishing a finite element analysis geometric model according to geometric parameters of an actual structure, selecting corresponding units according to the mechanics characteristics of different media, simulating the constitutive characteristics of fluid through a modulus-variable unit, and simulating the transmission between the fluid and a flexible skin through a binding and constraining method by means of a fluid unit and a solid unit. The method is simple in process and convenient to operate, and the workloads of the finite element analysis on the flexible liquid injection structure for different media are greatly reduced.
Description
Technical field
The present invention relates to aircraft structural mechanics analysis field, particularly the finite element modeling method of the flexible topping up structure of a kind of different medium.
Background technology
So a kind of structure is had in engineer applied, placement of flexible covering on elastic construction, the inner filling liquid of flexible covering, distribution pressure is born in flexible covering outside, by the pressure of rearrange liquids and the shape of flow change structure, this structure belongs to the flexible topping up structure of different medium, wherein relate to the medium such as fluid, solid, because the mechanical behavior feature of each medium is different, the interphase interaction of each medium is complicated, and often relate to structure large deformation problem, bring very large difficulty to Mechanics Simulation analysis.At present for Finite Element Simulation Analysis many employings fluid structurecoupling method of the flexible topping up structure of this multimedium, but fluid and structural simulation process is complicated, finite element analysis workload large, brings certain difficulty to practical application.Therefore, need to find one can either the flexible topping up structural mechanical property of accurate simulation different medium and the comparatively simple method of modeling analysis process.
Summary of the invention
Technical matters to be solved by this invention is: the finite element modeling method providing the flexible topping up structure of a kind of different medium, can the mechanical property of the flexible topping up structure of accurate simulation different medium, do not need to carry out complicated fluid and structural simulation, modeling analysis process is comparatively simple simultaneously.
The present invention mainly comprises the following steps: the finite element modeling method of the flexible topping up structure of different medium, is characterized by and said method comprising the steps of:
A) finite element analysis geometric model is set up according to the geometric parameter of practical structures; Described geometric parameter refers to form parameter and the characteristic dimension of each parts in the flexible topping up structure of different medium;
B) choose corresponding units according to the mechanics feature of different medium: flexible covering can produce moderate finite deformation, the unit that can carry out geometrical non-linearity calculating should be selected; Solid structure, according to practical structures size Selection unit, is selected plate unit, is selected solid element when practical structures is entity structure when practical structures is thin plate;
C) adopt variable modulus unit to simulate the constitutive characteristics of fluid: when building the stiffness matrix of solid element, each stiffness coefficient to be set to variable, to change each stiffness coefficient size according to the actual loading conditions of structure, making it meet the mechanical characteristics of fluid media (medium);
D) element of fluid adopts with solid unit the method bundling and retrain: element of fluid is all equal with the displacement of solid unit all directions.
The invention has the beneficial effects as follows: 1) adopt the present invention can simulate the mechanical property of the flexible topping up structure of different medium comparatively accurately.Can the mechanical property feature of fluid media (medium) under different stress in accurate simulation enclosure space by variable modulus unit, adopt binding constraint between different medium unit, the transitive relation between different medium can be simulated.2) this invention process is simple, easy to operate, substantially reduce the number the workload of the flexible topping up structural finite element analysis of different medium.
Accompanying drawing explanation
Fig. 1 is the flexible topping up structural representation of embodiment of the present invention different medium:
Wherein, " 1 " is flexible covering, and " 2 " are the fluid media (medium)s such as gas, liquid, and " 3 " are elastic constructions, the shape before dotted line and solid line represent flexible topping up malformation respectively in figure and after distortion.
Embodiment
Below by specific embodiment and by reference to the accompanying drawings to further detailed description of the present invention.This example is the variable flexible structure of a bulge profile, be made up of elastic construction, flexible covering, inner fill fluid (gas or liquid) medium, flexible covering and inner fluid media (medium) of filling integrally common force and deformation, elastic construction is connected with it as the supporting construction of flexible covering, and structural representation is shown in accompanying drawing 1.Geometric parameter according to practical structures sets up finite element analysis model, and described geometric parameter refers to form parameter and the characteristic dimension of each parts in the flexible topping up structure of different medium;
A) choose unit according to the mechanics feature of different medium: wherein 2 simulate with solid element, 1,3 simulate with plate unit.
B) adopt variable modulus unit to simulate the constitutive characteristics of fluid: when building the stiffness matrix of solid element, each stiffness coefficient to be set to variable;
Fluid can bear larger pressure, and it is very little to pull to and shear load-bearing capacity, substantially can ignore.According to this feature, when building the stiffness matrix of solid element, each stiffness coefficient is set to variable, when structure bear press to load time, by adjustment unit axially and tangential stiffness coefficient, make unit have larger rigidity pressing to, and shear stiffness is very little; When structure bear pull to load time, each for unit stiffness coefficient parameter is all adjusted to little value, represents element of fluid all directions rigidity under tension state all very little.
C) simulate between the solid element of 2 and the plate unit of simulation 1, simulate the plate unit of 3 and all adopt to bundle retrain with simulation 1 plate unit, make element of fluid all equal with the displacement of solid unit all directions, simulate the transmission between fluid and flexible covering.
Claims (1)
1. the finite element modeling method of the flexible topping up structure of different medium, is characterized by and said method comprising the steps of:
A) finite element analysis geometric model is set up according to the geometric parameter of practical structures; Described geometric parameter refers to form parameter and the characteristic dimension of each parts in the flexible topping up structure of different medium;
B) choose corresponding units according to the mechanics feature of different medium: flexible covering can produce moderate finite deformation, the unit that can carry out geometrical non-linearity calculating should be selected; Solid structure, according to practical structures size Selection unit, is selected plate unit, is selected solid element when practical structures is entity structure when practical structures is thin plate;
C) adopt variable modulus unit to simulate the constitutive characteristics of fluid: when building the stiffness matrix of solid element, each stiffness coefficient to be set to variable, to change each stiffness coefficient size according to the actual loading conditions of structure, making it meet the mechanical characteristics of fluid media (medium);
D) element of fluid and solid unit adopt the method bundling and retrain, and element of fluid is all equal with the displacement of solid unit all directions, the transmission between simulation fluid and flexible covering.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410664415.9A CN104392038B (en) | 2014-11-19 | 2014-11-19 | The finite element modeling method of different medium flexibility filling liquid structure |
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| CN201410664415.9A CN104392038B (en) | 2014-11-19 | 2014-11-19 | The finite element modeling method of different medium flexibility filling liquid structure |
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| CN104392038A true CN104392038A (en) | 2015-03-04 |
| CN104392038B CN104392038B (en) | 2018-11-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108038258A (en) * | 2017-11-02 | 2018-05-15 | 成都飞机工业（集团）有限责任公司 | A kind of ejection impact dynamic response analysis method based on Coupled Rigid-flexible |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110084428A1 (en) * | 2009-10-09 | 2011-04-14 | Spirit Aerosystems, Inc. | Apparatus and method for manufacturing an aircraft stringer |
| CN103984802A (en) * | 2014-04-17 | 2014-08-13 | 中国航空工业集团公司沈阳飞机设计研究所 | Finite element modeling simplification method of honeycomb sandwich structure |
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2014
- 2014-11-19 CN CN201410664415.9A patent/CN104392038B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110084428A1 (en) * | 2009-10-09 | 2011-04-14 | Spirit Aerosystems, Inc. | Apparatus and method for manufacturing an aircraft stringer |
| CN103984802A (en) * | 2014-04-17 | 2014-08-13 | 中国航空工业集团公司沈阳飞机设计研究所 | Finite element modeling simplification method of honeycomb sandwich structure |
Non-Patent Citations (2)
| Title |
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| 郎利辉等: "6061铝合金飞行器翼尖蒙皮充液成形及起皱控制研究", 《锻压技术》 * |
| 郎利辉等: "飞机大型复杂双曲度蒙皮充液成形数值模拟及实验研究", 《精密成形工程》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108038258A (en) * | 2017-11-02 | 2018-05-15 | 成都飞机工业（集团）有限责任公司 | A kind of ejection impact dynamic response analysis method based on Coupled Rigid-flexible |
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