CN118133401A - Calculation and analysis method and device for air bag supporting movable dam - Google Patents
Calculation and analysis method and device for air bag supporting movable dam Download PDFInfo
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Abstract
The invention provides a calculation and analysis method and a device for an air bag supporting movable dam, and relates to the technical field of data processing, wherein the method comprises the following steps: extracting counter force of a gate root node, and independently carrying out finite element analysis on the pressing plate; applying load and boundary conditions conforming to actual conditions, and solving stress distribution and deformation of the pressing plate; extracting the constraint force of the main anchor bolt on the pressing plate by acquiring the joint force of the anchor bolt and the pressing plate; calculating stress distribution of the anchor bolts according to the extracted constraint force of the main anchor bolts and the known anchor bolt pretightening force and geometric dimensions; comparing the calculated anchor bolt stress with allowable stress of the anchor bolt material, and if the calculated stress is smaller than the allowable stress, the anchor bolt strength meets the requirement; otherwise, performing design optimization. The invention can more truly simulate the geometric shape and the stress state of the actual structure, and improves the accuracy of calculation and analysis.
Description
Technical Field
The invention relates to the technical field of data processing, in particular to a calculation and analysis method and a calculation and analysis device for an air bag supporting movable dam.
Background
In hydraulic engineering, movable dams are important hydraulic structures for adjusting water level, flood diversion, sand discharge and the like. The traditional movable dam adopts a steel structure or a concrete structure, and the structural forms have certain strength and stability, but have the problems of large weight, large opening and closing force, easy corrosion, difficult maintenance and the like in the use process.
In order to solve these problems, a novel air bag supporting movable dam has appeared in recent years. The movable dam adopts the high-strength flexible air bag as a supporting structure and has the advantages of light weight, small opening and closing force, corrosion resistance, easy maintenance and the like. However, because the structural form of the air bag supporting movable dam is special, the analysis of the stress performance and the stability of the air bag supporting movable dam is complex, and special calculation and analysis are needed.
At present, the calculation and analysis method for the air bag supporting movable dam is not mature and perfect enough. The traditional analysis method is often calculated based on a simplified mechanical model and an empirical formula, and the stress performance and deformation condition of an actual structure are difficult to accurately reflect.
Disclosure of Invention
The invention aims to solve the technical problem of providing a calculation and analysis method and a device for an air bag supporting movable dam, which can more truly simulate the geometric shape and the stress state of an actual structure by establishing a three-dimensional model of a gate, a pressing plate, an anchor bolt and an air bag, and improve the accuracy of calculation and analysis.
In order to solve the technical problems, the technical scheme of the invention is as follows:
in a first aspect, a method for computational analysis of an air bag supporting movable dam includes:
establishing a three-dimensional model of the gate, the pressing plate, the anchor bolt and the air bag;
Defining the attribute of the material, and carrying out grid division on the three-dimensional model;
according to the actual situation, applying boundary conditions to the three-dimensional model, running finite element analysis, and solving stress distribution and deformation conditions of the gate under a given load;
extracting counter force of a gate root node, and independently carrying out finite element analysis on the pressing plate;
Applying load and boundary conditions conforming to actual conditions, and solving stress distribution and deformation of the pressing plate;
Extracting the constraint force of the main anchor bolt on the pressing plate by acquiring the joint force of the anchor bolt and the pressing plate;
Calculating stress distribution of the anchor bolts according to the extracted constraint force of the main anchor bolts and the known anchor bolt pretightening force and geometric dimensions;
Comparing the calculated anchor bolt stress with allowable stress of the anchor bolt material, and if the calculated stress is smaller than the allowable stress, the anchor bolt strength meets the requirement; otherwise, performing design optimization.
Further, the properties of the material include modulus of elasticity, poisson's ratio, density, and yield strength.
Further, establishing a three-dimensional model of the gate, the pressing plate, the anchor bolt and the air bag, comprising:
creating a three-dimensional model of the gate according to the shape and the size of the gate;
Creating a three-dimensional model of the pressing plate according to the connection relation of the gate and the anchor bolts;
the diameter, length and distribution of the anchor bolt in the structure establish a three-dimensional model of the anchor bolt;
Drawing a two-dimensional sketch, including dimensions and contours, according to the design specification, material properties and working conditions of the air bag;
stretching the two-dimensional sketch to generate a three-dimensional shape of the air bag;
and setting material properties and boundary conditions of the three-dimensional shape, and simulating an air bag connection mode to obtain a three-dimensional model of the air bag.
Further, meshing the three-dimensional model includes:
reading the geometric shapes, the sizes and the material properties of the three-dimensional model of the gate, the three-dimensional model of the pressing plate, the three-dimensional model of the anchor bolt and the three-dimensional model of the air bag;
Analyzing the geometric shape, the size and the material properties to determine key feature areas of the three-dimensional model of the gate, the three-dimensional model of the platen, the three-dimensional model of the anchor bolt and the three-dimensional model of the air bag;
Determining grid type and global grid density according to the geometric complexity and analysis requirements of the three-dimensional model of the gate, the three-dimensional model of the pressing plate, the three-dimensional model of the anchor bolt and the three-dimensional model of the air bag;
The continuous geometric space is divided into a series of elements according to grid type and global grid density, each element being connected to a node, which is a corner point of the element, to form a discrete grid.
Further, according to the actual situation, applying boundary conditions to the three-dimensional model, running finite element analysis, and solving stress distribution and deformation conditions of the gate under a given load, wherein the method comprises the following steps:
Assigning a respective physical attribute to each element;
Applying boundary conditions and initial conditions on elements of the three-dimensional model;
for each element, constructing a local stiffness matrix and a force vector according to the corresponding physical attribute and geometric shape;
The method comprises the steps of summarizing local stiffness matrixes and force vectors of all units to construct a global stiffness matrix and a global force vector of a three-dimensional model;
solving a global stiffness matrix equation by using a conjugate gradient method to obtain displacement response of each node;
from the node displacement, stress and strain responses for each element are calculated.
Further, extracting the counter force of gate root node, carrying out finite element analysis to the clamp plate alone, include:
Applying boundary and load conditions under actual working conditions to the gate model;
performing grid division on the gate model, and executing finite element solution to obtain stress, strain and displacement response data;
according to the stress, strain and displacement response data, calculating and extracting counterforce data on the root node of the gate;
and performing grid division on the pressure plate model, and operating a finite element solver to analyze the performance of the pressure plate according to the configured boundary and load conditions.
Further, applying load and boundary conditions according to actual conditions, solving stress distribution and deformation of the compression plate, including:
acquiring a three-dimensional model of the pressing plate and grid division data of the three-dimensional model;
Determining boundary conditions of the three-dimensional model according to the three-dimensional model of the pressing plate and grid division data thereof,
And configuring parameters of a solver according to the analysis type, running the solver, and calculating a three-dimensional model of the pressing plate element by element based on the element stiffness matrix and the quality matrix by utilizing a finite element analysis algorithm.
In a second aspect, a computing and analyzing apparatus for an air bag supporting movable dam includes:
The acquisition module is used for establishing a three-dimensional model of the gate, the pressing plate, the anchor bolt and the air bag; defining the attribute of the material, and carrying out grid division on the three-dimensional model; according to the actual situation, applying boundary conditions to the three-dimensional model, running finite element analysis, and solving stress distribution and deformation conditions of the gate under a given load; extracting counter force of a gate root node, and independently carrying out finite element analysis on the pressing plate; applying load and boundary conditions conforming to actual conditions, and solving stress distribution and deformation of the pressing plate;
The processing module is used for extracting the constraint force of the main anchor bolt on the pressing plate by acquiring the joint force of the anchor bolt and the pressing plate; calculating stress distribution of the anchor bolts according to the extracted constraint force of the main anchor bolts and the known anchor bolt pretightening force and geometric dimensions; comparing the calculated anchor bolt stress with allowable stress of the anchor bolt material, and if the calculated stress is smaller than the allowable stress, the anchor bolt strength meets the requirement; otherwise, performing design optimization.
In a third aspect, a computing device includes:
One or more processors;
And a storage means for storing one or more programs that, when executed by the one or more processors, cause the one or more processors to implement the method.
In a fourth aspect, a computer readable storage medium has a program stored therein, which when executed by a processor, implements the method.
The scheme of the invention at least comprises the following beneficial effects:
By establishing a three-dimensional model of the gate, the pressing plate, the anchor bolt and the air bag, the geometric shape and the stress state of the actual structure can be more truly simulated, and the accuracy of calculation and analysis is improved. The invention adopts a finite element analysis method to solve, and can consider the factors of nonlinearity, geometric nonlinearity, contact nonlinearity and the like of the material, thereby more accurately reflecting the stress distribution and deformation condition of the structure under the action of complex load. According to the invention, the counter force of the gate root node is extracted, and the pressure plate is independently subjected to finite element analysis, so that the stress performance and stability of the pressure plate can be more accurately evaluated. According to the invention, by calculating the stress distribution of the anchor bolt and comparing the stress distribution with the allowable stress of the material, whether the strength of the anchor bolt meets the requirement can be judged.
Drawings
Fig. 1 is a schematic view of a gate system stress model of a calculation and analysis method of an air bag supporting movable dam according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a platen stress model of a calculation and analysis method of an air bag supporting movable dam according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described more closely below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As shown in fig. 1, an embodiment of the present invention proposes a calculation and analysis method of an air bag supporting movable dam, the method including:
step 11, establishing a three-dimensional model of the gate, the pressing plate, the anchor bolt and the air bag;
step 12, defining the attribute of the material, and carrying out grid division on the three-dimensional model;
Step 13, applying boundary conditions to the three-dimensional model according to actual conditions, running finite element analysis, and solving stress distribution and deformation conditions of the gate under a given load;
Step 14, extracting counter force of the root node of the gate, and independently carrying out finite element analysis on the pressing plate;
step 15, applying load and boundary conditions which are consistent with the actual conditions, and solving the stress distribution and deformation of the compression plate;
Step 16, extracting the constraint force of the main anchor bolt on the pressing plate by acquiring the joint force of the anchor bolt and the pressing plate;
step 17, calculating stress distribution of the anchor bolts according to the extracted constraint force of the main anchor bolts, the known anchor bolt pretightening force and the known geometric dimension;
step 18, comparing the calculated anchor bolt stress with allowable stress of the anchor bolt material, and if the calculated stress is smaller than the allowable stress, the anchor bolt strength meets the requirement; otherwise, performing design optimization; the properties of the material include modulus of elasticity, poisson's ratio, density and yield strength.
In the embodiment of the invention, in step 11, the geometric characteristics and the spatial relationship of the actual structure can be accurately simulated through the three-dimensional model. Step 12, determining physical characteristics of the material, such as elastic modulus, poisson ratio, density, yield strength and the like, and ensuring the accuracy of an analysis result; grid partitioning then helps to balance computational accuracy and computational efficiency. And 13, applying the boundary conditions meeting the actual conditions can reflect the constraint and load effects under the actual working conditions, and the finite element analysis can accurately predict the stress and deformation response of the gate. And 14, independently analyzing the pressing plate, so that the stress and deformation states of the pressing plate under the action of the gate can be accurately estimated, and the optimization design is facilitated. And 15, applying the actual load and the boundary conditions can ensure the practicability and the reliability of the analysis result, and is helpful for accurately evaluating the performance of the pressing plate. And 16, accurately extracting the constraint force of the main anchor bolt is a key for evaluating the performance of the anchor bolt, and is beneficial to subsequent anchor bolt strength check. And 17, combining the constraint force of the main anchor bolt and other related parameters, and accurately calculating the stress distribution of the anchor bolt. And step 18, comparing the safety of the anchor bolt design with the allowable stress, and if the safety of the anchor bolt design does not meet the requirement, carrying out design optimization, and improving the overall performance and safety of the structure.
In a preferred embodiment of the invention, building a three-dimensional model of the gate, platen, anchor bolt and air bag comprises:
creating a three-dimensional model of the gate according to the shape and the size of the gate;
Creating a three-dimensional model of the pressing plate according to the connection relation of the gate and the anchor bolts;
the diameter, length and distribution of the anchor bolt in the structure establish a three-dimensional model of the anchor bolt;
Drawing a two-dimensional sketch, including dimensions and contours, according to the design specification, material properties and working conditions of the air bag;
stretching the two-dimensional sketch to generate a three-dimensional shape of the air bag;
and setting material properties and boundary conditions of the three-dimensional shape, and simulating an air bag connection mode to obtain a three-dimensional model of the air bag.
In the embodiment of the invention, the actual structures of the gate, the pressing plate, the anchor bolts and the air bag can be accurately simulated by creating a three-dimensional model according to the actual size and the shape. The three-dimensional model provides an intuitive visual effect that allows a designer to clearly see and understand the spatial relationships, connection patterns, and interactions of the various components, helping to discover potential design issues and optimize. Through three-dimensional modeling, rapid design iteration and optimization can be performed in a computer environment, and complicated processes of traditional manual drawing and physical prototype manufacturing are avoided, so that design efficiency is greatly improved. The three-dimensional model can be conveniently imported into finite element analysis software to perform accurate stress analysis, deformation analysis, stability analysis and the like, and a powerful tool is provided for performance evaluation and optimization design of the structure. By performing accurate three-dimensional modeling and analysis at the design stage, potential design defects and problems can be found in advance, and timely modification and optimization can be performed, so that the cost and risk in the actual manufacturing process are reduced. The three-dimensional model can be used as a common language for communication and collaboration among various departments, so that the various departments such as design, production, purchase, quality inspection and the like can better understand and execute respective tasks, and the overall working efficiency and quality are improved.
In a preferred embodiment of the present invention, meshing a three-dimensional model includes:
reading the geometric shapes, the sizes and the material properties of the three-dimensional model of the gate, the three-dimensional model of the pressing plate, the three-dimensional model of the anchor bolt and the three-dimensional model of the air bag;
Analyzing the geometric shape, the size and the material properties to determine key feature areas of the three-dimensional model of the gate, the three-dimensional model of the platen, the three-dimensional model of the anchor bolt and the three-dimensional model of the air bag;
Determining grid type and global grid density according to the geometric complexity and analysis requirements of the three-dimensional model of the gate, the three-dimensional model of the pressing plate, the three-dimensional model of the anchor bolt and the three-dimensional model of the air bag;
The continuous geometric space is divided into a series of elements according to grid type and global grid density, each element being connected to a node, which is a corner point of the element, to form a discrete grid.
In the embodiment of the invention, the geometric shape and the material property of the actual structure can be accurately simulated by meshing the three-dimensional model. The grid division can be adjusted according to the geometric complexity and analysis requirements of the model, and not only can use fine grids in key feature areas to capture more details, but also can use thicker grids in non-key areas to save computing resources. Reasonable meshing can balance the relationship between computational accuracy and computational efficiency. By optimizing the grid layout and density, the calculation time and cost can be reduced on the premise of ensuring the calculation accuracy. The model after grid division can be conveniently subjected to post-processing operation, such as extracting calculation results of stress, strain, displacement and the like, and visual display and further analysis and evaluation are performed. When the calculation result is problematic, the possible problem areas can be more easily positioned by looking at the grid division condition, and the method is helpful for quickly finding out and correcting the problem reasons. For structures comprising multiple components and complex connection relationships, such as gates, platens, anchors, air bags, etc., the meshing may be performed separately for each component and then assembled into a monolithic model for analysis, thereby supporting a comprehensive assessment of the complex structure.
In a preferred embodiment of the present invention, applying boundary conditions to the three-dimensional model according to actual conditions, running finite element analysis, and solving stress distribution and deformation conditions of the gate under a given load, including:
Assigning a respective physical attribute to each element;
Applying boundary conditions and initial conditions on elements of the three-dimensional model;
for each element, constructing a local stiffness matrix and a force vector according to the corresponding physical attribute and geometric shape;
The method comprises the steps of summarizing local stiffness matrixes and force vectors of all units to construct a global stiffness matrix and a global force vector of a three-dimensional model;
solving a global stiffness matrix equation by using a conjugate gradient method to obtain displacement response of each node;
from the node displacement, stress and strain responses for each element are calculated.
In the embodiment of the invention, the constraint and the load of the gate in the actual working environment can be accurately simulated by applying the boundary condition and the initial condition according to the actual situation, so that the analysis result which is closer to the actual stress and deformation is obtained. The finite element analysis can comprehensively consider the geometric shape, material properties, boundary conditions and load condition of the gate structure, comprehensively evaluate the strength, rigidity and stability of the structure and provide reliable basis for structural design. Through finite element analysis, potential problems such as stress concentration, overlarge deformation and the like possibly existing in the gate structure can be found in time, targeted optimization is facilitated in the design stage, and safety problems in actual use are avoided. According to the finite element analysis result, the gate structure can be optimally designed, such as adjusting the structure size, changing the material distribution, etc., so as to improve the overall performance and economic benefit of the structure. Compared with the traditional physical experiment and prototype test method, the finite element analysis can be completed on a computer rapidly, so that time and cost are saved greatly, and risks and uncertainties possibly brought by the physical experiment are avoided.
In a preferred embodiment of the present invention, extracting the reaction force of the gate root node, and performing finite element analysis on the platen alone, includes:
Applying boundary and load conditions under actual working conditions to the gate model;
performing grid division on the gate model, and executing finite element solution to obtain stress, strain and displacement response data;
according to the stress, strain and displacement response data, calculating and extracting counterforce data on the root node of the gate;
and performing grid division on the pressure plate model, and operating a finite element solver to analyze the performance of the pressure plate according to the configured boundary and load conditions.
In the embodiment of the invention, the practicability and the reliability of the analysis result can be ensured by applying the boundary and the load condition under the actual working condition to the gate model, so that the subsequent analysis of the pressing plate can be based on the actual working environment. Reaction force data on root nodes are calculated and extracted from finite element analysis of the gate model, and the key data are important basis for evaluating the performance of the pressing plate, so that the accuracy of analysis is ensured. The grid division and the finite element analysis are carried out on the pressing plate model independently, so that the performance evaluation of the pressing plate can be focused, the interference of other parts is avoided, and the stress distribution and deformation condition of the pressing plate under a given load can be known more accurately. Through carrying out independent analysis to the clamp plate, can discern potential stress concentration region or the region that warp too greatly, and then carry out optimal design to the clamp plate structure, improve its bearing capacity and stability. The analysis of the gate and the pressing plate is carried out separately, so that the complexity of the whole analysis can be reduced, the calculation time and the resource consumption are reduced, and meanwhile, the accuracy of an analysis result is maintained. Based on the analysis result of the pressing plate, design iteration can be conveniently performed, and the performance of the pressing plate is optimized by adjusting the geometric shape, material properties or connection mode of the pressing plate until the design requirement is met.
In a preferred embodiment of the invention, applying load and boundary conditions consistent with practical conditions, solving stress distribution and deformation of the compression plate comprises:
acquiring a three-dimensional model of the pressing plate and grid division data of the three-dimensional model;
Determining boundary conditions of the three-dimensional model according to the three-dimensional model of the pressing plate and grid division data thereof,
And configuring parameters of a solver according to the analysis type, running the solver, and calculating a three-dimensional model of the pressing plate element by element based on the element stiffness matrix and the quality matrix by utilizing a finite element analysis algorithm.
In the embodiment of the invention, the analysis result of the pressing plate is ensured to be closer to the actual working condition by applying the load and the boundary condition which are consistent with the actual condition, thereby improving the accuracy and the reliability of the design. The finite element analysis can comprehensively consider various forces and constraints of the pressing plate in an actual working environment, and further accurately evaluate stress distribution and deformation conditions of the pressing plate. This helps to find potential design flaws and optimize them in time. According to the stress distribution and deformation result of the pressing plate, the structure, the material or the connection mode of the pressing plate can be optimized, so that the bearing capacity and the stability of the pressing plate can be improved. This helps to reduce the risk of structural failure and improves the safety of the overall structure. Through finite element analysis, the actual working condition of the pressing plate can be simulated on a computer, and complicated and expensive physical experiments and prototype tests are avoided. This saves greatly the time and cost of design and development, and improves the working efficiency. Finite element analysis software generally provides rich post-processing functions, and analysis results can be intuitively displayed in the form of graphs, charts and the like. This helps the designer better understand and interpret the analysis results and communicates effectively with team members or clients. By finite element analysis of different designs, quantitative comparisons of the performance of each scheme can be made.
The following is a specific case:
Taking a gate with a water retaining height of 5.0 meters (including a dam crest overflow height) and a gate width of 10 meters as an example, the calculation and analysis method of the air bag supporting movable dam is combined with the attached drawing and the technology.
The method mainly comprises the following steps: firstly, taking a gate as a stressed object, and solving the root constraint force of the gate; secondly, taking the pressing plate as a stressed analysis object, and solving the constraint force of the main anchor bolt on the pressing plate; and thirdly, calculating and checking the main anchor bolt strength.
The first step, the gate is used as a stress object to obtain the root constraint force of the gate
When the water blocking height of the air bag supporting movable dam is determined, the following basic parameters can be known according to the design structure: gate water blocking height h=5.0m (including dam crest overflow height), gate width b=10m, water density=1000 kg/m 3 and gravity acceleration g≡9.80m/s 2.
According to the structure, the gate plate is taken as a stress analysis object, and a stress model is established as shown in figure 1.
As can be seen from fig. 1, the gate plate is balanced by the combined action of the horizontal water pressure F 1, the vertical water pressure F 2, the gate dead weight F 3, the air bag-to-gate supporting force F 4, and the horizontal restraining force F x and the vertical restraining force F y of the base flexible connection to the gate root.
With F 1L1+F2L2+F3L3＝F4L4 (1) at the root of the gate
According to the equilibrium relation of forces
In the formulas (1), (2) and (3), L 1、L2、L3、L4 is moment, which can be measured from a stress model, F 3 is the gate dead weight,The included angle between the supporting force of the air bag to the gate and the horizontal plane is directly measured from the stress model. F 1、F2 can be solved by the following formula:
F2＝ρgAW1b (5)
ρ, g, h, b in the formulas (4) (5) are known parameters, A W1 is the hydraulic pressure area acting on the gate cross section, and is the hatched area on the gate in the figure.
F 4、Fx、Fy can be obtained by combining the formulas (1) (2) (3) (4) (5).
The horizontal restraining force F x and the vertical restraining force F y of the air bag to the gate support force F 4 and the basic flexible connection to the root of the gate are balanced under the combined action.
Secondly, taking the pressing plate as a stressed analysis object, and solving the constraint force of the main anchor bolt on the pressing plate;
The method is characterized in that a stress model is built by taking a pressing plate as a stress object, as shown in a figure II, and the pressing plate is balanced under the combined action of a main anchor bolt pretightening force F, an acting force F x、Fy of the root of a gate to the pressing plate, a supporting force F a、Fb of the ground to the pressing plate and a friction force F f.
Based on the force balance principle, there is FXa-F B×(a+b)-Fy × (a+b+c) -Fxxd=0 (6) for moment taking at point A
According to the equilibrium relationship of forces, F f-Fx =0 (7)
F-Fa-Fb-Fy＝0 (8)
In the formulas (6) and (7), a, b, c, d is moment, and the moment is calculated or obtained by measurement in a structural diagram; friction force F f is solved for F f =f×μ by; (9) μ in formula (9) is the coefficient of friction between the platen and the underlying flexible connection, which is constant.
By combining formulas (6), (7), (8) and (9), the pretightening force F, the friction force F f, the supporting counterforce F A and F of the ground facing pressure plate can be obtained B
In the first step, the air bag is balanced under the combined action of the supporting force F 4 of the air bag to the gate, the horizontal constraint force F x of the basic soft connection to the root of the gate and the vertical constraint force F y, and the step uses the pressing plate as a stress analysis object, so that the constraint force data (namely the anchor bolt pretightening force F) of the main anchor bolt to the pressing plate can be obtained.
Thirdly, checking the strength of the main anchor bolt;
In the second step, the anchor bolt pretightening force F is obtained, and the anchor bolt stress can be solved by the following formula:
In the formula (10), Z is the number of the anchor bolts, d12 is the dangerous section diameter of the anchor bolts, and the dangerous section diameter can be obtained by related examination manual. The anchor bolt strength is checked [ sigma ] > 2sigma (11) as follows
[ Sigma ] is the allowable stress of the anchor bolt.
In combination with the calculation of the first step and the second step, on the premise that the horizontal constraint force F x and the vertical constraint force F y of the air bag on the gate support force F 4 and the basic flexible connection on the gate root are balanced under the combined action, constraint force data (namely anchor pre-tightening force F) of the main anchor bolt on the pressing plate are calculated, and the stress [ sigma ] of the anchor bolt Xu Ying can be calculated by combining the calculation of the step.
As shown in fig. 2, an embodiment of the present invention further provides a calculation and analysis apparatus 20 of an air bag supporting movable dam, including:
An acquisition module 21 for creating a three-dimensional model of the gate, the platen, the anchor bolt, and the air bag; defining the attribute of the material, and carrying out grid division on the three-dimensional model; according to the actual situation, applying boundary conditions to the three-dimensional model, running finite element analysis, and solving stress distribution and deformation conditions of the gate under a given load; extracting counter force of a gate root node, and independently carrying out finite element analysis on the pressing plate; applying load and boundary conditions conforming to actual conditions, and solving stress distribution and deformation of the pressing plate;
The processing module 22 is used for extracting the constraint force of the main anchor bolt on the pressing plate by acquiring the joint force of the anchor bolt and the pressing plate; calculating stress distribution of the anchor bolts according to the extracted constraint force of the main anchor bolts and the known anchor bolt pretightening force and geometric dimensions; comparing the calculated anchor bolt stress with allowable stress of the anchor bolt material, and if the calculated stress is smaller than the allowable stress, the anchor bolt strength meets the requirement; otherwise, performing design optimization.
Optionally, the properties of the material include modulus of elasticity, poisson's ratio, density, and yield strength.
Optionally, building a three-dimensional model of the gate, the pressing plate, the anchor bolt and the air bag, including:
creating a three-dimensional model of the gate according to the shape and the size of the gate;
Creating a three-dimensional model of the pressing plate according to the connection relation of the gate and the anchor bolts;
the diameter, length and distribution of the anchor bolt in the structure establish a three-dimensional model of the anchor bolt;
Drawing a two-dimensional sketch, including dimensions and contours, according to the design specification, material properties and working conditions of the air bag;
stretching the two-dimensional sketch to generate a three-dimensional shape of the air bag;
and setting material properties and boundary conditions of the three-dimensional shape, and simulating an air bag connection mode to obtain a three-dimensional model of the air bag.
Optionally, meshing the three-dimensional model includes:
reading the geometric shapes, the sizes and the material properties of the three-dimensional model of the gate, the three-dimensional model of the pressing plate, the three-dimensional model of the anchor bolt and the three-dimensional model of the air bag;
Analyzing the geometric shape, the size and the material properties to determine key feature areas of the three-dimensional model of the gate, the three-dimensional model of the platen, the three-dimensional model of the anchor bolt and the three-dimensional model of the air bag;
Determining grid type and global grid density according to the geometric complexity and analysis requirements of the three-dimensional model of the gate, the three-dimensional model of the pressing plate, the three-dimensional model of the anchor bolt and the three-dimensional model of the air bag;
The continuous geometric space is divided into a series of elements according to grid type and global grid density, each element being connected to a node, which is a corner point of the element, to form a discrete grid.
Optionally, according to the actual situation, applying a boundary condition to the three-dimensional model, running finite element analysis, and solving stress distribution and deformation conditions of the gate under a given load, including:
Assigning a respective physical attribute to each element;
Applying boundary conditions and initial conditions on elements of the three-dimensional model;
for each element, constructing a local stiffness matrix and a force vector according to the corresponding physical attribute and geometric shape;
The method comprises the steps of summarizing local stiffness matrixes and force vectors of all units to construct a global stiffness matrix and a global force vector of a three-dimensional model;
solving a global stiffness matrix equation by using a conjugate gradient method to obtain displacement response of each node;
from the node displacement, stress and strain responses for each element are calculated.
Optionally, extracting a counter force of a gate root node, and performing finite element analysis on the platen alone, including:
Applying boundary and load conditions under actual working conditions to the gate model;
performing grid division on the gate model, and executing finite element solution to obtain stress, strain and displacement response data;
according to the stress, strain and displacement response data, calculating and extracting counterforce data on the root node of the gate;
and performing grid division on the pressure plate model, and operating a finite element solver to analyze the performance of the pressure plate according to the configured boundary and load conditions.
Optionally, applying load and boundary conditions consistent with practical conditions, solving stress distribution and deformation of the compression plate, including:
acquiring a three-dimensional model of the pressing plate and grid division data of the three-dimensional model;
Determining boundary conditions of the three-dimensional model according to the three-dimensional model of the pressing plate and grid division data thereof,
And configuring parameters of a solver according to the analysis type, running the solver, and calculating a three-dimensional model of the pressing plate element by element based on the element stiffness matrix and the quality matrix by utilizing a finite element analysis algorithm.
It should be noted that the apparatus is an apparatus corresponding to the above method, and all implementation manners in the above method embodiment are applicable to this embodiment, so that the same technical effects can be achieved.
Embodiments of the present invention also provide a computer including: a processor, a memory storing a computer program which, when executed by the processor, performs the method as described above. All the implementation manners in the method embodiment are applicable to the embodiment, and the same technical effect can be achieved.
Embodiments of the present invention also provide a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform a method as described above. All the implementation manners in the method embodiment are applicable to the embodiment, and the same technical effect can be achieved.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, etc.
Furthermore, it should be noted that in the apparatus and method of the present invention, it is apparent that the components or steps may be disassembled and/or assembled. Such decomposition and/or recombination should be considered as equivalent aspects of the present invention. Also, the steps of performing the series of processes described above may naturally be performed in chronological order in the order of description, but are not necessarily performed in chronological order, and some steps may be performed in parallel or independently of each other. It will be appreciated by those of ordinary skill in the art that all or any of the steps or components of the methods and apparatus of the present invention may be implemented in hardware, firmware, software, or a combination thereof in any computing device (including processors, storage media, etc.) or network of computing devices, as would be apparent to one of ordinary skill in the art after reading this description of the invention.
The object of the invention can thus also be achieved by running a program or a set of programs on any computing device. The computing device may be a well-known general purpose device. The object of the invention can thus also be achieved by merely providing a program product containing program code for implementing said method or apparatus. That is, such a program product also constitutes the present invention, and a storage medium storing such a program product also constitutes the present invention. It is apparent that the storage medium may be any known storage medium or any storage medium developed in the future. It should also be noted that in the apparatus and method of the present invention, it is apparent that the components or steps may be disassembled and/or assembled. Such decomposition and/or recombination should be considered as equivalent aspects of the present invention. The steps of executing the series of processes may naturally be executed in chronological order in the order described, but are not necessarily executed in chronological order. Some steps may be performed in parallel or independently of each other.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (10)
1. A method of computational analysis of an air bag supporting movable dam, the method comprising:
establishing a three-dimensional model of the gate, the pressing plate, the anchor bolt and the air bag;
Defining the attribute of the material, and carrying out grid division on the three-dimensional model;
according to the actual situation, applying boundary conditions to the three-dimensional model, running finite element analysis, and solving stress distribution and deformation conditions of the gate under a given load;
extracting counter force of a gate root node, and independently carrying out finite element analysis on the pressing plate;
Applying load and boundary conditions conforming to actual conditions, and solving stress distribution and deformation of the pressing plate;
Extracting the constraint force of the main anchor bolt on the pressing plate by acquiring the joint force of the anchor bolt and the pressing plate;
Calculating stress distribution of the anchor bolts according to the extracted constraint force of the main anchor bolts and the known anchor bolt pretightening force and geometric dimensions;
Comparing the calculated anchor bolt stress with allowable stress of the anchor bolt material, and if the calculated stress is smaller than the allowable stress, the anchor bolt strength meets the requirement; otherwise, performing design optimization.
2. The method of computational analysis of an air bag supporting movable dam of claim 1, wherein the properties of the material include modulus of elasticity, poisson's ratio, density, and yield strength.
3. The method of computational analysis of an air bag supporting movable dam according to claim 2, wherein creating a three-dimensional model of the gate, the platen, the anchor bolt, and the air bag comprises:
creating a three-dimensional model of the gate according to the shape and the size of the gate;
Creating a three-dimensional model of the pressing plate according to the connection relation of the gate and the anchor bolts;
the diameter, length and distribution of the anchor bolt in the structure establish a three-dimensional model of the anchor bolt;
Drawing a two-dimensional sketch, including dimensions and contours, according to the design specification, material properties and working conditions of the air bag;
stretching the two-dimensional sketch to generate a three-dimensional shape of the air bag;
and setting material properties and boundary conditions of the three-dimensional shape, and simulating an air bag connection mode to obtain a three-dimensional model of the air bag.
4. A method of computational analysis of an air bag supporting movable dam according to claim 3, wherein meshing the three-dimensional model comprises:
reading the geometric shapes, the sizes and the material properties of the three-dimensional model of the gate, the three-dimensional model of the pressing plate, the three-dimensional model of the anchor bolt and the three-dimensional model of the air bag;
Analyzing the geometric shape, the size and the material properties to determine key feature areas of the three-dimensional model of the gate, the three-dimensional model of the platen, the three-dimensional model of the anchor bolt and the three-dimensional model of the air bag;
Determining grid type and global grid density according to the geometric complexity and analysis requirements of the three-dimensional model of the gate, the three-dimensional model of the pressing plate, the three-dimensional model of the anchor bolt and the three-dimensional model of the air bag;
The continuous geometric space is divided into a series of elements according to grid type and global grid density, each element being connected to a node, which is a corner point of the element, to form a discrete grid.
5. The computational analysis method of an air bag supporting movable dam according to claim 4, wherein applying boundary conditions to the three-dimensional model according to actual conditions, running finite element analysis, solving stress distribution and deformation conditions of the gate under given load, comprises:
Assigning a respective physical attribute to each element;
Applying boundary conditions and initial conditions on elements of the three-dimensional model;
for each element, constructing a local stiffness matrix and a force vector according to the corresponding physical attribute and geometric shape;
The method comprises the steps of summarizing local stiffness matrixes and force vectors of all units to construct a global stiffness matrix and a global force vector of a three-dimensional model;
solving a global stiffness matrix equation by using a conjugate gradient method to obtain displacement response of each node;
from the node displacement, stress and strain responses for each element are calculated.
6. The method of computational analysis of an air bag supporting movable dam according to claim 5, wherein extracting the reaction force of the gate root node, and performing finite element analysis on the platen alone, comprises:
Applying boundary and load conditions under actual working conditions to the gate model;
performing grid division on the gate model, and executing finite element solution to obtain stress, strain and displacement response data;
according to the stress, strain and displacement response data, calculating and extracting counterforce data on the root node of the gate;
and performing grid division on the pressure plate model, and operating a finite element solver to analyze the performance of the pressure plate according to the configured boundary and load conditions.
7. The computational analysis method of an air bag supporting movable dam according to claim 6, wherein applying load and boundary conditions conforming to actual conditions, solving stress distribution and deformation of a pressing plate, comprises:
acquiring a three-dimensional model of the pressing plate and grid division data of the three-dimensional model;
Determining boundary conditions of the three-dimensional model according to the three-dimensional model of the pressing plate and grid division data thereof,
And configuring parameters of a solver according to the analysis type, running the solver, and calculating a three-dimensional model of the pressing plate element by element based on the element stiffness matrix and the quality matrix by utilizing a finite element analysis algorithm.
8. A computational analysis device for an air bag supporting movable dam, comprising:
The acquisition module is used for establishing a three-dimensional model of the gate, the pressing plate, the anchor bolt and the air bag; defining the attribute of the material, and carrying out grid division on the three-dimensional model; according to the actual situation, applying boundary conditions to the three-dimensional model, running finite element analysis, and solving stress distribution and deformation conditions of the gate under a given load; extracting counter force of a gate root node, and independently carrying out finite element analysis on the pressing plate; applying load and boundary conditions conforming to actual conditions, and solving stress distribution and deformation of the pressing plate;
The processing module is used for extracting the constraint force of the main anchor bolt on the pressing plate by acquiring the joint force of the anchor bolt and the pressing plate; calculating stress distribution of the anchor bolts according to the extracted constraint force of the main anchor bolts and the known anchor bolt pretightening force and geometric dimensions; comparing the calculated anchor bolt stress with allowable stress of the anchor bolt material, and if the calculated stress is smaller than the allowable stress, the anchor bolt strength meets the requirement; otherwise, performing design optimization.
9. A computing device, comprising:
One or more processors;
Storage means for storing one or more programs which when executed by the one or more processors cause the one or more processors to implement the method of any of claims 1 to 7.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a program which, when executed by a processor, implements the method according to any of claims 1 to 7.
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| CN202410391183.8A CN118133401A (en) | 2024-04-02 | 2024-04-02 | Calculation and analysis method and device for air bag supporting movable dam |
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