CN109446683A - A kind of wind turbine cabin cover strength calculation method - Google Patents
A kind of wind turbine cabin cover strength calculation method Download PDFInfo
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- 238000004364 calculation method Methods 0.000 title claims abstract description 21
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 24
- 239000010959 steel Substances 0.000 claims abstract description 24
- 239000002131 composite material Substances 0.000 claims abstract description 20
- 239000011521 glass Substances 0.000 claims abstract description 17
- 230000006835 compression Effects 0.000 claims abstract description 8
- 238000007906 compression Methods 0.000 claims abstract description 8
- 239000002356 single layer Substances 0.000 claims abstract description 7
- 238000010276 construction Methods 0.000 claims description 13
- 239000011152 fibreglass Substances 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 239000006260 foam Substances 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 229910000746 Structural steel Inorganic materials 0.000 claims description 4
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 4
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- 238000000034 method Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 5
- 239000003365 glass fiber Substances 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
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- 235000013399 edible fruits Nutrition 0.000 description 1
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- 239000000203 mixture Substances 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The present invention provides a kind of wind turbine cabin cover strength calculation method, comprising: establishes the geometrical model of wind turbine cabin cover；Geometrical model is imported into finite element analysis software, using the pretreatment function of finite element emulation software, laying modeling is carried out to cover shell；The material properties and section attribute for defining each component of engine room cover, establish the finite element model of wind turbine cabin cover, wherein when definition material attribute, need to define the Young's modulus and Poisson's ratio of glass layer different directions respectively；Boundary condition and load are applied to the finite element model of wind turbine cabin cover；Calculate the single layer ess-strain of wind-force wind turbine cabin cover glass steel part；Its intensity is assessed using composite material strength failure criteria.The present invention models composite plys, and the orthotropy definition material attribute based on material is determined that engine room cover force simulation is truer, and calculated result is more acurrate using maximum tension and compression strain criterion and Tsai-Wu.
Description
Technical field
The invention belongs to wind power generating set strength of parts analysis technical fields, and in particular to a kind of wind turbine cabin cover
Strength calculation method.
Background technique
With the continuous development of modern society, demand of the people to the energy also rapid growth.The tradition of non-renewable energy resources
The energy is because environment and stockage are constantly restricted, and actively simultaneously renewable energy is cleaned in development for country and government, to replace
Traditional non-renewable energy resources.
Wind energy is a kind of important clean energy resource, is of great significance for solving global environment and energy crisis.In recent years
Come, domestic wind power generating set is quickly grown, therefore the safety problem of Wind turbine is also most important, can in order to guarantee equipment
By property, it is necessary to which structure and fatigue to Wind turbine all parts carry out calculating analysis.
Shell of the engine room cover as wind power generating set exempts from sunlight, rain for protecting in cabin mechanically and electrically component
Water and ice and snow etc. influence, while safeguarding that below deck equipment provides security protection and working space for staff.Engine room cover safely may be used
Important prerequisite by being Wind turbines normal operation, the Strength co-mputation of composite material engine room cover are the key that measure part reliability
Factor.
Application No. is the application for a patent for invention of CN201710666311.5, " a kind of engine room cover of wind turbine intensity is determining
Method " a kind of engine room cover strength calculation method based on finite element modeling is disclosed, but simplify cover material when model modeling
For orthogonal isotropic material, and the modeling of material laying is not carried out according to practical when finite element modeling, not with practical situations
It is consistent.Further, since composite properties, which does not extract the single layer stress of material and tension and compression are strained according to failure standard
The intensity of engine room cover is then measured, therefore, which does not consider composite properties, and excessive simplification is carried out to model, is led
Calculated result is caused relatively large deviation occur.
Summary of the invention
The object of the present invention is to provide a kind of wind turbine cabin cover strength calculation methods, and the present invention is based on composite materials to have
First emulation technology is limited, leads to engine room cover Strength co-mputation inaccuracy to the unreasonable simplification of material for solving current calculation method
Problem.
The present invention provides the following technical solutions:
A kind of wind turbine cabin cover strength calculation method, comprising the following steps:
(1) geometrical model for establishing wind turbine cabin cover, cover shell, cover shell including glass fiber reinforced plastics composite material
The guardrail and anemoclinograph of interior steel construction and cover cover top portion；
(2) geometrical model of wind turbine cabin cover is imported into finite element analysis software, using finite element emulation software
Pretreatment function carries out laying modeling to cover shell；
(3) material properties and section attribute for defining each component of engine room cover, establish the finite element mould of wind turbine cabin cover
Type；Wherein need the Young's modulus and Poisson's ratio that define glass layer different directions respectively；
(4) boundary condition is applied to the finite element model of wind turbine cabin cover；
(5) load is applied to the finite element model of wind turbine cabin cover；
(6) equivalent stress of the steelwork component of wind-force wind turbine cabin cover and the single layer strain of glass steel part are calculated
Stress；
(7) the glass reinforced plastic strength of parts of engine room cover is assessed using composite material strength failure criteria.
Preferably, when carrying out laying modeling to cover shell, gel coating resin, glass layer and foam enhancing are defined respectively
Layer；Definition steel construction is structure steel layer.
Preferably, in the finite element model of wind turbine cabin cover, glass layer is simulated using shell unit, structure steel layer
It is simulated using shell unit, foam enhancement layer is simulated using shell unit, and gel coating resin is simulated using shell unit.
Preferably, in the finite element model of wind turbine cabin cover, definition anemoclinograph is quality point, quality point and peace
Constraint equation is established in dress face.
Preferably, it is mutually bonded between cover shell and steel construction, is defined in the finite element model of wind turbine cabin cover
Contact surface multi-point constraint；Wind turbine cabin cover is integrally attached on pedestal, in the finite element model of wind turbine cabin cover
Define fixed constraint.
Preferably, the load finite element model of wind turbine cabin cover applied include wind load, gravitational load or
Changing load；Apply concentrated force in the loser and guardrail of wind turbine cabin cover, the direction of concentrated force is that each possibility is fallen
Direction.
To the wind load of the finite element model of wind turbine cabin cover are as follows: distinguish each wind-engaging end face of cabin cover outer surface
Apply limited airflow pressure load.
The changing load that the finite element model of wind turbine cabin cover is applied are as follows: to engine room cover travel region, standing area
Apply well-distributed pressure with horizontal protective region.
Preferably, described to the equivalent stress of engine room cover of wind turbine steelwork component and the single layer of glass steel part
The operating condition that strain stress is calculated includes: that gravitational load is superimposed with changing load；Gravitational load is superimposed with wind load, to consider most
Rough sledding calculates the ultimate strength of engine room cover.
Preferably, the monolayer strengths of glass-reinforced plastic material are sentenced using maximum tension and compression strain criterion and Tsai-Wu criterion
It is fixed；According to structural steel yield strength criterion, the steel construction intensity inside engine room cover is assessed.
The beneficial effects of the present invention are: being orthotropic composite material the present invention is based on the cover shell of engine room cover
Material properties and actual production technique, carry out composite plys in finite element modeling, define orthotropic material
Different directions material property parameter keeps the engine room cover Strength co-mputation deviation of this finite element model small, is more in line with reality；Finite element
Model load and boundary condition are in strict accordance with the standard of calculating, and engine room cover stress condition is truer, and calculated result is more accurate；It adopts
Calculated result is assessed with composite material strength failure criteria, determination method is more reasonable.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.In the accompanying drawings:
Fig. 1 is wind turbine cabin cover geometrical model schematic diagram of the invention；
Fig. 2 is the steel construction schematic diagram inside wind turbine cabin cover of the invention；
Fig. 3 is material profile structural schematic diagram when carrying out laying modeling to cover shell.
Specific embodiment
A kind of wind turbine cabin cover strength calculation method, comprising the following steps:
(1) geometrical model of wind turbine cabin cover is established, as depicted in figs. 1 and 2, the cover including glass fiber reinforced plastics composite material
Steel construction 4 in body case 1, cover shell and the guardrail 2 and anemoclinograph 3 for being fixed on cover cover top portion, wherein wind-powered electricity generation
Set engine room cover is integrally attached on pedestal, is mutually bonded between cover shell 1 and steel construction 4.
(2) wind turbine cabin cover geometrical model suitably simplify, delete tiny threaded hole and chamfering；By wind-powered electricity generation
The 3-D geometric model of set engine room cover imports finite element analysis software ANSYS Workbench.Since composite material is orthogonal
Anisotropic material, application software pretreatment function, to engine room cover carry out laying modeling, as shown in figure 3, establish gel coating resin 11,
Glass layer 12, foam enhancement layer 13；Definition steel construction 4 is structure steel layer.
(3) before finite element analysis software in processing, the material properties and section attribute of each component of engine room cover are defined, are established
The finite element model of wind turbine cabin cover.
In definition material attribute, since glass fibre is orthotropic material, along machine direction and vertical fibre
The material properties for tieing up direction is entirely different, needs to define the Young's modulus and Poisson's ratio of glass layer different directions respectively: all
Such as be defined as follows material parameter: the Young's modulus of X-direction is 23850MPa, and the Young's modulus of Y-direction is 23850MPa, Z-direction
Young's modulus be 839MPa, the Poisson's ratio in three directions is 0.3.The tensile strength for defining glass layer is 380MPa, compression
Intensity is 150MPa, in-plane shear strength 48MPa.
When defining section attribute, glass layer is simulated using shell unit, and glass layer is by several layers of to ten several layers of
Glass fibre composition, the differences such as thickness, ply stacking angle of each layer glass fibre need to define respectively；Structure steel layer is rectangle steel
Pipe, is simulated using shell unit, and foam enhancement layer is simulated using shell unit, and gel coating resin is simulated using shell unit.
(4) boundary condition is applied to the finite element model of wind turbine cabin cover.Definition anemoclinograph is quality point, matter
Amount point establishes constraint equation with mounting surface；It is mutually bonded between cover shell and steel construction, in the finite element of wind turbine cabin cover
Contact surface multi-point constraint is defined in model；Wind turbine cabin cover is integrally attached on pedestal, in having for wind turbine cabin cover
Fixed constraint is defined in limit meta-model.
(5) load, including wind load, gravitational load and changing load are applied to the finite element model of wind turbine cabin cover.
Wind load is to apply limited airflow pressure load respectively to each wind-engaging end face of cabin cover outer surface.Consider 3 kinds of operating conditions:
DLC6.1:50 mono- meets fitful wind, and airflow direction is in the Sector Range of front ± 15 °, load safety coefficient γF=
1.35；
DLC6.2:50 mono- meets fitful wind, and airflow direction is in all directions, load safety coefficient γF=1.1, electric network fault
And yaw driving noenergy buffering；
DLC7.1:1 mono- meets fitful wind, and airflow direction is in all directions, load safety coefficient γF=1.1, electric network fault and
Yaw driving has energy snubber.
According to aerodynamic principle, when some direction of engine room cover windward when, the direction is by positive wine pressure, cover remaining five
Direction is by negative wind pressure.When engine room cover is by limit wind load, wind-engaging front end face and rear end face limit wind load usage factor CwRespectively 0.8
With 0.5, wind-engaging side end face limit wind load usage factor CwIt is 0.6.According to momentum theorem and fluid Bernoulli equation, by following
Formula calculate separately wind-engaging front end face under the conditions of Limit of Wind Speed, wind-engaging rear end face, wind-engaging side end face unilateral side by limit wind load:
P=V2CWγFρ/2
Wherein P: unit area practical limit wind load, V: wind speed is standardized according to Germanischer Lloyds, is selected under different wind regime
Limit of Wind Speed, Cw: limit wind load usage factor, γF: load safety coefficient, ρ: atmospheric density.
Changing load is the well-distributed pressure applied to engine room cover travel region, standing area and horizontal protective region.To cabin
Top/bottom walkable region applies 3kN/m2Well-distributed pressure, load safety coefficient 1.5；People standing area is in 20cmx20cm
Apply the concentrated force of 1.5kN in region, load safety coefficient is 1.5；It is used to provide the structure member of horizontal protective, example to all
Such as guardrail, horizontal load zone of action height be higher than floor or standing line 1.1m, load be distributed span 20cm or
The region of 20cmx20cm, load are the concentrated force of 1.5kN, and load safety coefficient is 1.5.
Gravitational load be engine room cover from gravitational load safety coefficient under heavy load, DLC6.1 operating condition be 1.35, Qi Tagong
Condition safety coefficient is 1.1.
Apply concentrated force 20kN in the loser and guardrail of wind turbine cabin cover, the direction of concentrated force is each possible generation
The direction fallen.
(6) equivalent stress of the steelwork component of wind-force wind turbine cabin cover and the single layer strain of glass steel part are calculated
Stress；Operating condition includes that gravitational load is superimposed and gravitational load is superimposed two kinds of limiting conditions with wind load with changing load, to calculate
The ultimate strength of engine room cover.Such as following two groups of operating condition tables, table 1 is gravitational load and changing load composite condition table, and A, B, C are to stand
Location point, AX, AY, AZ are that standing place corresponds to horizontal protective point；Table 2 is gravitational load and wind load composite condition.
Finite element analysis software is submitted to calculate respectively the finite element model of the above operating condition and limit wind load.
1 gravitational load of table and moving loads operating condition
2 gravitational load of table and wind load composite condition
| Operating condition | Explanation | Load combinations |
| DLC6.1_N | DLC6.1 wind is just blown | 1.35*DLC6.1_N+1.35*gravity+dis |
| DLC6.1_T | 15 ° of DLC6.1 windage yaw are just blown | 1.35*DLC6.1_T+1.35*gravity+dis |
| DLC6.2_N | DLC6.2 wind is just blown | 1.1*DLC6.2_N+1.1*gravity+dis |
| DLC6.2_L | DLC6.2 wind is side-blown | 1.1*DLC6.2_L+1.1*gravity+dis |
| DLC6.2_B | DLC6.2 wind back is blown | 1.1*DLC6.2_B+1.1*gravity+dis |
| DLC7.1_N | DLC7.1 wind is just blown | 1.1*DLC7.1_N+1.1*gravity+dis |
| DLC7.1_L | DLC7.1 wind is side-blown | 1.1*DLC7.1_L+1.1*gravity+dis |
| DLC7.1_L | DLC7.1 wind back is blown | 1.1*DLC7.1_B+1.1*gravity+dis |
(7) the glass reinforced plastic strength of parts of cover shell is assessed using composite material strength failure criteria, is applied
Maximum tension and compression strain criterion and Tsai-Wu criterion determine its intensity.
Maximum tension and compression strain criterion are as follows: if without corresponding strength character data, using GL standardize specified in minimal design
Allowable value, it may be assumed that design compressive strain is 0.25%, and design stretching strain is 0.35%.Material safety factor for compressive stress is design compressive strain
With the ratio of the compressive strain FEM calculation value of ANSYS Workbench；Material tensile-strength safety factor be design stretching strain and
The ratio of the stretching strain FEM calculation value of ANSYS Workbench shows cabin if two safety coefficient ranges are all larger than 1
Cover intensity is met the requirements.Calculate the two safety coefficient ranges be 1.5-2.5, be all larger than 1, engine room cover intensity is met the requirements.
Tsai-Wu criterion are as follows: read in the tensile strength in three direction of glass fiber material defined in pre-treatment, compression by force
Degree and in-plane shear strength calculate the Failure Factor F.I. of Tsai-Wu criterion in conjunction with the engine room cover equivalent stress that software calculates,
Show that engine room cover intensity is met the requirements if F.I. is less than 1.F.I. is calculated according to Tsai-Wu criterion and is distributed in 0.1-0.62
Between, less than 1, engine room cover intensity is met the requirements.
According to structural steel yield strength criterion, the intensity of steelframe structure inside engine room cover is assessed.
Test value is compared practical survey using Mr. Yu's 2W Wind turbines by engine room cover strength calculation method of the present invention
Test result is it is found that the calculating deviation using this method is no more than 15%, as a result reliably.
Comparative example:
" a kind of engine room cover of wind turbine intensity is determining for the patent of invention that request for utilization number is CN201710666311.5
Method " disclosed in method calculate the engine room cover intensity of Wind turbines, cover material is reduced to orthogonal respectively to same by when model modeling
Property material, not to cover shell carry out laying modeling, the deviation maximum of this strength calculation method result is more than 100%, tie
Fruit is unreliable.
Therefore, the finite element simulation technology that the present invention uses includes composite plys modeling and Strength Failure assessment, base
In orthotropic material property definition material properties, finite element model is more in line with reality, the calculating to engine room cover intensity
As a result more accurate.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, although referring to aforementioned reality
Applying example, invention is explained in detail, for those skilled in the art, still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features.It is all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of wind turbine cabin cover strength calculation method, which comprises the following steps:
(1) geometrical model for establishing wind turbine cabin cover, cover shell, the cover shell including glass fiber reinforced plastics composite material
The guardrail and anemoclinograph of interior steel construction and the cover cover top portion；
(2) geometrical model of the wind turbine cabin cover is imported into finite element analysis software, using finite element emulation software
Pretreatment function carries out laying modeling to the cover shell；
(3) material properties and section attribute for defining each component of wind turbine cabin cover, establish wind turbine cabin cover
Finite element model；Wherein when definition material attribute, the Young's modulus and Poisson's ratio of glass layer different directions are defined respectively；
(4) boundary condition is applied to the finite element model of the wind turbine cabin cover；
(5) load is applied to the finite element model of the wind turbine cabin cover；
(6) it calculates the equivalent stress of steelwork component of the wind turbine cabin cover and the single layer of glass steel part answers allergic effect
Power；
(7) the glass reinforced plastic strength of parts of engine room cover is assessed using composite material strength failure criteria.
2. wind turbine cabin cover strength calculation method according to claim 1, which is characterized in that the cover shell
When carrying out laying modeling, gel coating resin, glass layer and foam enhancement layer are defined respectively；Defining the steel construction is structural steel
Layer.
3. wind turbine cabin cover strength calculation method according to claim 2, which is characterized in that in the Wind turbines
In the finite element model of engine room cover, the glass layer is simulated using shell unit, and the structure steel layer is simulated using shell unit,
The foam enhancement layer is simulated using shell unit, and the gel coating resin is simulated using shell unit.
4. wind turbine cabin cover strength calculation method according to claim 2, which is characterized in that in the Wind turbines
In the finite element model of engine room cover, defining the anemoclinograph is quality point, and the quality point and mounting surface establish constraint equation.
5. wind turbine cabin cover strength calculation method according to claim 4, which is characterized in that the cover shell and
It is mutually bonded between the steel construction, defines contact surface multi-point constraint in the finite element model of the wind turbine cabin cover；Institute
It states wind turbine cabin cover to be integrally attached on pedestal, defines and fixed about in the finite element model of the wind turbine cabin cover
Beam.
6. wind turbine cabin cover strength calculation method according to claim 1, which is characterized in that the Wind turbines
The load that the finite element model of engine room cover applies includes wind load, gravitational load or changing load；In the wind turbine cabin
The loser and guardrail of cover apply concentrated force, and the direction of concentrated force is the direction that each possibility is fallen.
7. wind turbine cabin cover strength calculation method according to claim 6, which is characterized in that described to wind-power electricity generation
It includes: that gravitational load is superimposed with changing load that the intensity of set engine room cover, which calculate,；Gravitational load is superimposed with wind load, to consider
Least favorable situation calculates the ultimate strength of engine room cover.
8. wind turbine cabin cover strength calculation method according to claim 7, which is characterized in that answered using maximum tension and compression
Become criterion and Tsai-Wu determines the glass layer intensity of the cover shell；According to structural steel yield strength criterion,
Assess the steel construction intensity inside the wind turbine cabin cover.
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Cited By (5)
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| CN109977619A (en) * | 2019-04-26 | 2019-07-05 | 南京中人能源科技有限公司 | A kind of engine room cover rigidity and stability determine method |
| CN110096789A (en) * | 2019-04-26 | 2019-08-06 | 南京中人能源科技有限公司 | A kind of pod rigidity and stability determine method |
| CN111709177A (en) * | 2020-08-24 | 2020-09-25 | 华仪风能有限公司 | Method for evaluating strength of engine room cover of wind generating set |
| CN113281168A (en) * | 2021-05-20 | 2021-08-20 | 云度新能源汽车有限公司 | Method for detecting firmness of carbon fiber accessory for automobile |
| US11608158B1 (en) | 2022-07-25 | 2023-03-21 | Joon Bu Park | Negative Poisson's ratio materials for propellers and turbines |
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| CN109977619A (en) * | 2019-04-26 | 2019-07-05 | 南京中人能源科技有限公司 | A kind of engine room cover rigidity and stability determine method |
| CN110096789A (en) * | 2019-04-26 | 2019-08-06 | 南京中人能源科技有限公司 | A kind of pod rigidity and stability determine method |
| CN111709177A (en) * | 2020-08-24 | 2020-09-25 | 华仪风能有限公司 | Method for evaluating strength of engine room cover of wind generating set |
| CN111709177B (en) * | 2020-08-24 | 2020-12-04 | 华仪风能有限公司 | Method for evaluating strength of engine room cover of wind generating set |
| CN113281168A (en) * | 2021-05-20 | 2021-08-20 | 云度新能源汽车有限公司 | Method for detecting firmness of carbon fiber accessory for automobile |
| US11608158B1 (en) | 2022-07-25 | 2023-03-21 | Joon Bu Park | Negative Poisson's ratio materials for propellers and turbines |
| US11952090B2 (en) | 2022-07-25 | 2024-04-09 | Joon Bu Park | Negative Poisson's ratio materials for propellers and turbines |
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