CN107368651A - Hydropower Station Underground formula factory building kinematic analysis numerical model design method - Google Patents
Hydropower Station Underground formula factory building kinematic analysis numerical model design method Download PDFInfo
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Abstract
The invention discloses a kind of Hydropower Station Underground formula factory building kinematic analysis numerical model design method, belong to field of water conservancy, a kind of uniformity and normalization of achievable Hydropower Station Underground formula factory building modelling are provided, the Hydropower Station Underground formula factory building kinematic analysis numerical model design method of design cycle can be shortened simultaneously, comprise the following steps, Step 1: the 3 d structure model of structure Hydropower Station Underground formula factory building；Step 2: grid division；Step 3: setting grid cell type；Step 4: setting material properties；Step 5: set the type of attachment between different types of grid cell；Step 6: conditions setting.Design method of the present invention, it is widely portable in the respectively design of the Hydropower Station Underground formula factory building kinematic analysis numerical model based on finite Element Dynamic Analysis, and is advantageous to the design specification of the unified class model.
Description
Technical field
The present invention relates to Hydraulic and Hydro-Power Engineering technical field, more particularly to a kind of Hydropower Station Underground formula factory building kinematic analysis number
It is worth design methods.
Background technology
Mountain stream longitudinal slope in NORTHWEST CHINA, southwest is big, is suitable for developing hydraulic power potentials；Hydroelectric generation is current
The regenerative resource of most popular a kind of cleaning in the world.In order to efficiently utilize hydraulic power potentials, planning at present or building
Power station is intended to hugeization；The single-machine capacity of turbine-generator units is increasing, operating head polishing more and more higher.Powerhouse of hydropower station is
The nucleus of hub station arrangement, mill construction is both the synthesis of hydraulic structure and turbine-generator units electromechanical equipment,
It is the place of power station operations staff activity and production output electric energy again.And hugeization of mill construction weakens the firm of mill construction
Degree, the energy of Turbine Flow Passage fluctuation pressure is more prominent, and how to ensure large rubber good safe and stable operation is that industry must attack
Gram problem.Factory building internal structure and its stress condition are complicated, based on the theoretical method for simplifying of structural mechanics portion inside factory building
Inaccuracy is had proved to be in the mechanical analysis of separation structure；And led as finite element unit method in recent years emulates in engineering structure
The progressively popularization in domain, it is non-as a kind of feasibility that the integrally-built force-mechanism of powerhouse of hydropower station is disclosed using finite element unit method
Chang Qiang technological means.And during the analysis of powerhouse of hydropower station is carried out using finite element, how correctly, specification establish water
The kinematic analysis numerical model of Power Plant structure becomes the emphasis of academia's concern.
In recent years, the kinematic analysis of powerhouse of hydropower station overall structure was carried out using finite element method (fem) analysis method to calculate
It is widely used, but due to lacking corresponding normative reference and authority file, and due to powerhouse of hydropower station kinematic analysis
Numerical model (may be simply referred to as factory building numerical model or factory building model etc. below) includes basement rock scope, the grid of different structure part
Numerous ginsengs such as type of attachment, size of mesh opening, modulus of elasticity and damping ratio between cell type, different grid cell types
Number, and the selection for these parameters causes the list for carrying out powerhouse of hydropower station design currently without a unified normative reference
Position is more or less in the design of factory building kinematic analysis numerical model to add respective design concept and experience, thus goes out
The different situation of powerhouse of hydropower station that existing different designing unit establishes, so cause constituent parts result of calculation exist compared with
Big otherness, the specification and uniformly of powerhouse of hydropower station modelling can not be realized.
In addition, when carrying out finite element dynamic analysis for the larger structure of this kind of volume of powerhouse of hydropower station, it is calculated
Amount is typically very huge, it is necessary to which the very powerful computer system of calculating speed could be completed.Therefore, ensureing to calculate knot
In the case of fruit accuracy, suitable model how is established to reduce amount of calculation, improves computational efficiency, and this class model
The factor for needing emphasis to consider during design.
The content of the invention
Present invention solves the technical problem that it is：The existing Hydropower Station Underground formula factory building designed based on finite Element Dynamic Analysis
Kinematic analysis numerical model, the problem of the unified Reference Design method of its design method and standard, the present invention is to provide one kind
The uniformity and normalization of Hydropower Station Underground formula factory building kinematic analysis numerical model design can be achieved, and ensuring analysis result standard
The Hydropower Station Underground formula factory building kinematic analysis numerical model design method of design cycle can also be shortened while true property.
The technical solution adopted for the present invention to solve the technical problems is：Hydropower Station Underground formula factory building kinematic analysis Numerical-Mode
Type design method, comprises the following steps,
Step 1: the 3 d structure model of structure Hydropower Station Underground formula factory building：According to power station in actual items engineering
The design structure or practical structures of following formula factory building, build the 3 d structure model of Hydropower Station Underground formula factory building；The three-dimensional knot
Structure model is made up of factory building main part and bedrock portion；The factory building main part includes factory building draft tube and factory building generator
The following structure of layer；The structure scope of the bedrock portion is：The border of bedrock portion is between the outline of factory building main part
Distance not less than twice of height H of factory building main part；
Step 2: grid division：Mesh generation is carried out to the 3 d structure model built in above-mentioned steps one, and set
The size of mesh opening of factory building main part is not more than the size of mesh opening of bedrock portion；
Step 3: setting grid cell type：Beam structure and pillar construction in factory building main part use beam list
Member, floor construction and fan housing structure in factory building main part use Slab element, and remaining structure in factory building main part is adopted
Use solid element；Bedrock portion uses solid element；
Step 4: setting material properties：For material properties corresponding to grid cell setting；Wherein setting for modulus of elasticity
It is set to：Static elasticity of the value of the modulus of elasticity of factory building main part corresponding to the actually used material of factory building main part is set
Modulus value, the value for setting the modulus of elasticity of bedrock portion are the static modulus of elasticity value corresponding to the actual rock mass of bedrock portion；It is right
In being set as damping ratio：It is 0.07 to set the damping ratio of factory building main part and the damping ratio of bedrock portion；
Step 5: set the type of attachment between different types of grid cell：To between different types of grid cell
Type of attachment use node pinned；
Step 6: conditions setting：Fixed constraint is applied to corresponding border on bedrock portion.
It is further：The structure scope of bedrock portion is：The border of bedrock portion to factory building main part outline
The distance between for twice of height H of factory building main part.
The beneficial effects of the invention are as follows：The present invention is directed to the existing Hydropower Station Underground formula factory building based on finite Element Dynamic Analysis
The problem of ununified Reference Design method of modelling and standard, give a kind of Hydropower Station Underground formula factory building power of specification
Numerical model design method is analyzed, fundamentally the method for specification Hydropower Station Underground formula factory building kinematic analysis numerical model design
And standard.The design method specify that the part of Hydropower Station Underground formula factory building model construction, the main composition of factory building main body
Partly, type of attachment between the value of modulus of elasticity, the value of damping ratio, different types of unit, the scope of bedrock portion and
Selection of structural units's type of setting means and each several part of its boundary condition etc..Therefore, by using of the present invention
Design method not only ensure that the uniformity and normalization of Hydropower Station Underground formula factory building modelling, and also can ensure that emulation
Uniformity, validity and the accuracy of analysis result；And factory building model can be shortened by using the method for the invention
Design cycle, the time required to amount of calculation and the analysis that can also further shorten its simulation analysis.
Brief description of the drawings
Fig. 1 is Hydropower Station Underground in Hydropower Station Underground formula factory building kinematic analysis numerical model design method of the present invention
The schematic diagram of formula factory building model；
Fig. 2 is the enlarged diagram of factory building main part in Fig. 1；
In figure mark for：The following structure 4 of factory building main part 1, bedrock portion 2, factory building draft tube 3, factory building generator floor,
Beam structure 5, floor construction 6, fan housing structure 7, spiral case 8, floor 9, unit region 10, runner 11.
Embodiment
The present invention is further described with reference to the accompanying drawings and detailed description.
Hydropower Station Underground formula factory building of the present invention is a kind of conventional factory building arrangement in powerhouse of hydropower station design form
Mode, its factory building main part 1 include factory building draft tube 3 and the following two parts of structure 4 of factory building generator floor；Wherein factory building tail water
Pipe 3 is typically located at the following bottom of structure 4 of factory building generator floor, as a part for the runner 11 of whole powerhouse of hydropower station,
Discharge for tail water.The following structure 4 of factory building generator floor then generally includes the floor 9 of multilayer, and between multilayer floor
By setting corresponding beam structure 5 and floor construction 6 grade to be used to be layered；Simultaneously in the following structure 4 of whole factory building generator floor
Medium position be provided with unit region 10, be mainly used in that the equipment such as spiral case 8, water turbine set and generating set are installed.In addition, by
In factory building main part 1 is integrally provided in into underground, then upstream current are incorporated into powerhouse of hydropower station by diversion tunnel
Row generates electricity, therefore powerhouse of hydropower station is influenceed very small by hydraulic pressure, thus does not consider water in design method of the present invention
The influence of load, i.e., the model construction to water body part is eliminated when building 3 d structure model.
In theory, the concrete structure of Hydropower Station Underground formula factory building is poor such as the difference of actual items engineering
It is different, therefore should setting according to actual items engineering when building the 3 d structure model of Hydropower Station Underground formula factory building in the present invention
Meter structure or practical structures are built, and when building 3 d structure model, should comprise at least factory building main part 1
With corresponding bedrock portion 2.Shown in accompanying drawing 1, in its 3 d structure model built, include factory building main part
Point 1 and corresponding bedrock portion 2, and factory building main part 1 therein include factory building draft tube 3 and factory building generator floor with
Lower structure 4.
In addition, for the selection range of bedrock portion 2, in order to reduce the selection of the bedrock portion 2 during analysis as far as possible
Influence of the scope to the analysis result of factory building main part 1, especially easily cause analysis result when the selection of basement rock scope is smaller
Inaccuracy.The present invention of structure scope in to(for) bedrock portion 2 is set with reference to following：The border of bedrock portion 2 is to factory building master
Twice of the distance between outline of body portion 1 not less than the height H of factory building main part 1.Certainly, in theory, basement rock portion
Points 2 structure scope is bigger, and its analysis result will be more accurate, but the amount of calculation needed for its analysis will be bigger；Therefore, it is of the invention
In the case where ensureing analysis result accuracy, further preferably set outside border to the factory building main part 1 of bedrock portion 2
The distance between profile is twice of the height H of factory building main part 1.Without loss of generality, to three-dimensional structure in the invention described above
The structure of model can use corresponding three-dimensional drawing software carry out, such as can use AutoCAD, Pro-E, CATIA or other
Three-dimensional drawing software is built.
, it is necessary to further carry out mesh generation to the model of structure after the completion of above-mentioned structure 3 d structure model, consider
Into the analysis project of reality, main perpetual object is generally factory building main part 1, therefore the present invention is preferably provided with factory building master
The size of mesh opening of body portion 1 is not more than the size of mesh opening of bedrock portion 2, i.e., can be by factory building main part 1 in grid division
Size of mesh opening is set as relatively small value, and the size of mesh opening of bedrock portion is set as to relatively large value；So set
Benefit on the one hand be that can ensure that the precision of analysis of factory building main part 1, on the other hand can then reduce analysis needed for
Amount of calculation, save and calculate cost.Certainly, in theory, in the case where not considering model amount of calculation, mesh generation is smaller, then its
The result of analysis is more detailed；Therefore set in the present invention when carrying out mesh generation to model after should considering actual conditions
Fixed corresponding size of mesh opening.In addition, if it is desired, also difference can be respectively divided in factory building main part 1 and bedrock portion 2
Region, and different zones are divided using different size of mesh opening, closed particularly with the emphasis in factory building main part 1
Region is noted, its size of mesh opening can be divided into the smaller situation relative to other parts, and then may be such that the emphasis closes
Note the analysis result in region in further detail.Without loss of generality, can be in corresponding finite element power point for the processing of grid division
Carried out in analysis software, such as carry out mesh generation in ANSYS or ABAQUS softwares；Certainly, special grid can also be used
Software is divided, can such as use HYPERMESH softwares.
After above-mentioned mesh generation, corresponding grid cell (alternatively referred to as unit) will be formed, further may be used in the present invention
Setup unit type of classifying is carried out according to the grid cell of different structure in model, is specially：Crossbeam in factory building main part 1
Structure 5 and pillar construction use beam element, and the floor construction 6 and fan housing structure 7 in factory building main part 1 use plate list
Member, remaining structure in factory building main part 1 use solid element；Bedrock portion 2 uses solid element.Above-mentioned factory building main body
Beam structure 5 and pillar construction in part 1, refer to corresponding in actual mill construction in the 3 d structure model of structure
Beam structure 5 and pillar construction etc., be located at factory building tail water referring for example to what is marked in the concrete structure diagram shown in accompanying drawing 1
Beam structure 5 in the following structure 4 of pipe factory building generator floor etc.；Accordingly, the floor construction 6 and wind in factory building main part 1
Cover structure 7, refer to the floor construction 6 and fan housing structure corresponded in the 3 d structure model of structure in actual mill construction
7, the floor construction 6 and the position that are located in the following structure 4 of factory building generator floor between each floor 9 as shown in referring to the drawings 1
Fan housing structure 7 in the circumference of unit region 10.By the corresponding He of beam structure 5 in factory building main part 1 in the invention described above
Corresponding floor construction 6 and fan housing structure 7 are used using beam element and Slab element by pillar construction, and the purpose is to true
In the case of protecting analysis result accuracy, the amount of calculation needed for model analysis is reduced as far as possible, is shortened the time required to calculating, is reduced meter
Cost needed for calculation.Certainly, without loss of generality, the computing capability in computing device is sufficient or to calculating the time without desired feelings
Under condition, all structures in factory building main part 1 can be calculated using solid element in theory.
The different grid cell classes such as beam element, Slab element and solid element are provided with factory building main part 1 in addition, working as
During the situation of type, due in the contact site of different units type, that the degree of freedom on a node basis is inconsistent be present, needed in the present invention
Type of attachment between different types of grid cell is set accordingly, wherein preferred pair different type in the present invention
Grid cell between type of attachment be attached using node pinned.
In addition, in the present invention for grid cell material properties setting, with reference to actual conditions, respectively each several part
Material properties corresponding to grid cell setting；Such as generally formed for factory building main part 1 by concrete cast, therefore for
Accordingly as property parameters such as the density of material corresponding to the part that concrete cast forms sets its corresponding concrete；Similarly,
For bedrock portion 2, then the parameter such as corresponding density of the basement rock in actual items is set.Without loss of generality, above-mentioned material
Expect corresponding parameter in attribute, can be measured by corresponding test method to obtain.
In addition, in the present invention when the material properties to grid cell are set, for setting for modulus of elasticity therein
It is fixed, according to following setting means：Set the value of the modulus of elasticity of factory building main part 1 actually used for factory building main part 1
Static modulus of elasticity value corresponding to material；The value for setting the modulus of elasticity of bedrock portion 2 is 2 actually used material of bedrock portion
Corresponding static modulus of elasticity value.The above-mentioned Elastic Modulus Values for directly calculating corresponding static elasticity model value as model,
Its benefit is：Because factory building main part 1 is concrete material under normal circumstances, and bedrock portion 2 is usually rock mass, accordingly
The dynamic modulus of elasticity of concrete material and rock mass is all higher than its static modulus of elasticity, while because entering to Hydropower Station Underground formula factory building
During row finite Element Dynamic Analysis, its dynamic shift value will reduce with the increase of Elastic Modulus Values, and dynamic displacement is to embody
The important indicator of oscillation intensity, therefore in order to ensure the security of analysis result, preferably actual moved using than it in the present invention
Property the smaller static modulus of elasticity value of modulus value as calculating elastic mould value used.Certainly, without loss of generality, it is right in the present invention
Obtained after the static modulus of elasticity value of respective material can be measured by corresponding experimental measurement method.
Furthermore, it is contemplated that when factory building main part 1 is generally formed by concrete cast, therefore combine different concrete grades
Corresponding elastic mould value size, the Elastic Modulus Values that factory building main part 1 can be further set in of the invention are directly
Static modulus of elasticity value corresponding to corresponding concrete, so directly can directly it be obtained by corresponding regulatory documents corresponding
Static modulus of elasticity value, can avoid carrying out measuring to the static modulus of elasticity of corresponding concrete.Similarly, with reference to conventional rock mass
Elastic mould value size, the Elastic Modulus Values of the also preferable bedrock portion 2 of the present invention are the phase of defined in related specifications
The static modulus of elasticity value of rock mass is answered, after the rock body types for only needing bedrock portion 2 in clear and definite actual items accordingly, you can logical
Related specifications file reference its corresponding static modulus of elasticity value is crossed, extra determination of experimental method its static elasticity mould can be avoided passing through
Value.
In addition, in the present invention when the material properties to grid cell are set, the setting for damping ratio therein,
According to following setting means：It is 0.07 to set the damping ratio of factory building main part 1 and the damping ratio of bedrock portion 2.In theory,
When carrying out finite Element Dynamic Analysis to Hydropower Station Underground formula factory building, the increase of damping ratio value can reduce mill construction model
Dynamic response.According to《Hydraulic structure earthquake resistant design code》DL5073 provides, mill construction damping ratio can with value 0.07, because
This present invention combines《Hydraulic structure earthquake resistant design code》Regulation, while in view of factory building main part 1 be usually coagulation
Native form, therefore the damping ratio of factory building main part 1 is set as 0.07.Further, since the damping ratio of bedrock portion 2 is generally higher than
The damping ratio of concrete, therefore the present invention is further also provided with the damping of bedrock portion 2 to ensure the security of analysis result
It is more consistent with the damping ratio of factory building main part 1 than value, it is 0.07.
In addition, in the present invention for boundary condition be set as by corresponding border on bedrock portion 2 be set as it is fixed about
Beam.Corresponding border refers to that bedrock portion 2 is by artificially limiting model when building 3 d structure model wherein on bedrock portion 2
The border formed after enclosing.And so-called fixed constraint, then three translation freedoms of all nodes are by entirely about on the border referred to
Beam fixes limitation.
In summary, using design method of the present invention, power station of the specification based on finite Element Dynamic Analysis
The design of following formula factory building kinematic analysis numerical model, not only increases the total quality of model, avoids corresponding select factors not
The variability issues of result of calculation caused by uniformly, and can ensure that analysis result after using design method of the present invention
Accuracy and shorten the modelling cycle and calculate analysis the time required to.Design method of the present invention, it can fit extensively
For in the respectively design of the Hydropower Station Underground formula factory building kinematic analysis numerical model based on finite Element Dynamic Analysis, and be advantageous to unite
The design specification of one such powerhouse of hydropower station model.
Claims (2)
1. Hydropower Station Underground formula factory building kinematic analysis numerical model design method, it is characterised in that：Comprise the following steps,
Step 1: the 3 d structure model of structure Hydropower Station Underground formula factory building：According to power station underground type in actual items engineering
The design structure or practical structures of factory building, build the 3 d structure model of Hydropower Station Underground formula factory building；The three-dimensional structure mould
Type is made up of factory building main part (1) and bedrock portion (2)；The factory building main part (1) includes factory building draft tube (3) and factory
The following structure of room generator floor (4)；The structure scope of the bedrock portion (2) is：The border of bedrock portion (2) is to factory building main body
Partly twice of the distance between the outline of (1) not less than the height H of factory building main part (1)；
Step 2: grid division：Mesh generation is carried out to the 3 d structure model built in above-mentioned steps one, and factory building is set
The size of mesh opening of main part (1) is not more than the size of mesh opening of bedrock portion (2)；
Step 3: setting grid cell type：Beam structure (5) and pillar construction in factory building main part (1) use beam
Unit, floor construction (6) and fan housing structure (7) in factory building main part (1) use Slab element, factory building main part (1)
In remaining structure use solid element；Bedrock portion (2) uses solid element；
Step 4: setting material properties：For material properties corresponding to grid cell setting；Wherein for the setting of modulus of elasticity
For：Set the value of the modulus of elasticity of factory building main part (1) quiet corresponding to factory building main part (1) actually used material
Elastic mould value, the value for setting the modulus of elasticity of bedrock portion (2) are the static elasticity corresponding to bedrock portion (2) actual rock mass
Modulus value；For being set as damping ratio：The damping ratio of setting factory building main part (1) and the damping ratio of bedrock portion (2) are equal
For 0.07；
Step 5: set the type of attachment between different types of grid cell：To the company between different types of grid cell
Connect form and use node pinned；
Step 6: conditions setting：Fixed constraint is applied to corresponding border on bedrock portion (2).
2. Hydropower Station Underground formula factory building kinematic analysis numerical model design method as claimed in claim 1, it is characterised in that：Base
The structure scope of petrosa point (2) is：The border of bedrock portion (2) to the distance between the outline of factory building main part (1) is
Twice of the height H of factory building main part (1).
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Application publication date: 20171121 |