CN114722671A - Falling analysis method of ball-borne load service cabin based on Ansys Ls-Dyna - Google Patents
Falling analysis method of ball-borne load service cabin based on Ansys Ls-Dyna Download PDFInfo
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Abstract
The method is based on the Ansys software platform, a finite element model of the ball-borne load service cabin is established for drop analysis, coarse meshing is used during primary analysis, meshing time can be reduced, the whole analysis time is saved, the finite element analysis speed can be improved, and an analysis result can be obtained quickly; and when the analysis result meets the falling requirement, carrying out grid optimization on the whole model according to the finite element grid inspection standard, and improving the accuracy of the analysis result. The method solves the problems that in the prior art, the analysis period is long, the experiment cost is high, the requirements for building a test model and an environment are high, and effective analysis cannot be performed due to the fact that simulation of the falling process of the load cabin is difficult.
Description
Technical Field
The invention relates to the field of load service cabin equipment, in particular to a falling analysis method of a ball load service cabin based on Ansys Ls-Dyna.
Background
The adjacent space generally refers to an airspace with the height of (20-100) km, and refers to a special position between the aviation and aerospace airspaces. The load service cabin in the adjacent space is optical, mechanical and electrical integrated equipment, and can carry a high-altitude balloon to reach the adjacent space for scientific experiments. In order to guarantee the subsequent treatment of scientific experiments, the load service cabin returns to the ground at a specific speed after completing a scientific task in an adjacent space, and considering that the impact with the ground at the moment of landing has an influence on the stability of the load service cabin, the safety of the load service cabin when the load service cabin lands needs to be analyzed in order to recover relevant instruments and equipment in the load service cabin.
The traditional analysis method mainly comprises the following steps: when the load service compartment is produced, a falling test model of the load service compartment is constructed according to the actual falling environment of the load service compartment so as to verify the falling safety of the load service compartment. However, such analysis period is long, when the load service cabin falls to the ground, most impact load needs to be counteracted to protect instruments and equipment in the load service cabin, and the process causes some irreversible deformation to the structure of the load service cabin, so that the test cost is increased. And the external dimension of the load service cabin is larger, so that the test platform is difficult to build, the simulation of the effective falling process is difficult to realize, and the effective analysis can not be carried out.
Disclosure of Invention
The invention provides a falling analysis method of a ball-borne load service cabin based on Ansys Ls-Dyna, which has the advantages of short whole analysis time and improved analysis efficiency and analysis accuracy, and solves the problems that the prior art has long analysis period, higher experiment cost, higher requirements on a test model and environment construction, and difficult simulation of the falling process of the load cabin, so that effective analysis cannot be performed.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention discloses a falling analysis method of a ball-borne load service cabin based on Ansys Ls-Dyna, which comprises the following steps: step 1: establishing a three-dimensional structure model of the ball-borne load service cabin in CAD software, and preprocessing the three-dimensional structure model to obtain a ball-borne load service cabin structure model; step 2: establishing a finite element model of the ball-borne load service cabin in Ansys software, setting a frame structure material of the ball-borne load service cabin as a nonlinear aluminum material, setting a buffer device as a pulp material, and assuming the ground as a rigid material; step S3: defining a ball load service cabin frame as an explicit dynamics unit beam161, and defining a buffer device as an explicit dynamics unit solid 164; step S4: and (3) setting the contact type of the overall structure model: the buffer device and the ball-loaded load service cabin frame are defined as binding constraints, the buffer device and the ball-loaded load service cabin frame and the ground are defined as friction constraints, the friction coefficient is set to be 0.5, and the dynamic coefficient is set to be 0.15; step S5: carrying out mesh division on the overall structure model, checking the quality of the overall mesh, and continuously optimizing the mesh to obtain a final finite element model; step S6: applying an initial velocity of 7m/s vertically downwards and applying a gravity acceleration (g) to the final finite element model after the meshing except the ground is finished; and step S7: obtaining an equivalent stress distribution cloud picture and a displacement deformation distribution cloud picture of the overall structure model of the ball-borne load service cabin after being impacted so as to measure whether the structure of the ball-borne load service cabin meets the falling requirement or not; and when the falling requirement is met, carrying out grid optimization on the whole structure model according to the finite element grid inspection standard.
Preferably, in the drop analysis method for the ball-borne load service cabin based on Ansys Ls-Dyna, in step S1, the building a three-dimensional structure model of the structure of the ball-borne load service cabin by using solid works three-dimensional structure software, and the preprocessing the three-dimensional structure model includes: simplifying the three-dimensional structure model, omitting in-cabin instruments and equipment, and marking the installation contact surface of each instrument and equipment by using a parting line; removing unnecessary threaded holes and small characteristic areas under the condition of not influencing the operation precision; and checking whether the three-dimensional structure model has structural characteristics which are easy to make mistakes during grid division and calculation when the three-dimensional structure model is assembled, and repairing the structural characteristics.
Preferably, in the drop analysis method for the ball-mounted load service capsule based on Ansys Ls-Dyna, in step S1, in step S2, the frame structure material of the ball-mounted load service capsule is set in the Ansys software self-contained material library, and each mechanical property parameter of the pulp material of the buffer device is manually input.
Preferably, in the drop analysis method of the ball load service cabin based on Ansys Ls-Dyna, in step S1, in step S3, the cell type of the model is manually input by using a command, and the frame of the ball load service cabin is defined as the 3-node display dynamics unit beam161, and the buffer device is the 8-node display dynamics unit solid 164.
Preferably, in the drop analysis method of the ball-carried load service capsule based on Ansys Ls-Dyna, in step S1, in step S4, the ball-carried load service capsule frame is packed into one part (part) as a whole, and the buffer device is installed at the bottom of the ball-carried load service capsule and takes the grassy soil as the actual material of the ground.
Preferably, in the method for analyzing the falling of the ball-mounted load service bay based on Ansys Ls-Dyna, in step S1, in step S5, the grid is continuously optimized so that the quality of the whole grid is within the warning values of the three inspection indexes, namely the cell quality, the aspect ratio and the jacobian, wherein the average cell quality of the whole grid is considered to be qualified between 0.75 and 1, the acceptable range of the average aspect ratio of the whole grid is less than 15, and the acceptable range of the average jacobian value of the whole grid is less than or equal to 30.
Preferably, in the drop analysis method of the ball-borne load service cabin based on Ansys Ls-Dyna, in step S1, in step S6, the instrument and equipment models installed in the ball-borne load service cabin are removed, the respective masses are equivalent to force loads, and the force loads are applied to the installation contact surfaces by a uniform load application mode, wherein the ground is defined as rigid constraints which do not change in 6 degrees of freedom in the whole analysis process.
Preferably, in the method for analyzing the falling of the ball-mounted load service bay based on Ansys Ls-Dyna, in step S1, in step S7, the analysis time is set to 0.06S, 100 equal spatial distribution points are taken as output results, and solution calculation is performed by using Ansys Ls-Dyna software.
Compared with the prior art, the invention has the beneficial effects that:
the method is based on the Ansys software platform, the finite element model of the spherical load service cabin is established for the falling analysis, actual equipment does not need to be produced for testing, the testing cost is reduced, the test model and the experimental environment are more convenient to establish, the digital simulation and analysis of the falling of the spherical load service cabin are realized, and the analysis result is more effective.
The method uses coarse meshing during primary analysis, can reduce the time of meshing, saves the time of the whole analysis, can improve the speed of finite element analysis, and can obtain the analysis result more quickly; and when the analysis result meets the falling requirement, carrying out grid optimization on the whole model according to the finite element grid inspection standard, and improving the accuracy of the analysis result. The grid division not only improves the analysis efficiency, but also improves the analysis accuracy.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below.
FIG. 1 is a flow chart of a method of drop analysis for an Ansys Ls-Dyna based ball load service bay of the present invention;
FIG. 2 is a schematic diagram showing the gridding result of the overall structure model in the drop analysis method of the ball-borne load service cabin based on Ansys Ls-Dyna according to the invention;
FIG. 3 is an equivalent stress distribution cloud chart of the overall structure model in the drop analysis method of the ball-borne load service cabin based on Ansys Ls-Dyna according to the invention;
FIG. 4 is a cloud of displacement deformation distribution of the overall structure model in the drop analysis method of the ball-carried load service capsule based on Ansys Ls-Dyna according to the present invention;
fig. 5 is a picture of the actual scene of the ball-carried load service bay involved in the method of the present invention after the drop.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
As shown in fig. 1, the method for analyzing the falling of the ball-carried load service cabin based on Ansys Ls-Dyna of the invention comprises the following steps:
step S1: and establishing a three-dimensional structure model of the ball-borne load service cabin in CAD software, and preprocessing the three-dimensional structure model to obtain the ball-borne load service cabin structure model.
In the step, CAD software, preferably Solidworks three-dimensional structure software, is adopted to establish a three-dimensional structure model for the structure of the ball-borne load service cabin, and the established three-dimensional structure model is preprocessed, wherein the preprocessing comprises the following steps: simplifying the built three-dimensional structure model, omitting instruments and equipment in the cabin, and marking the installation contact surface of each instrument and equipment by using a parting line; removing unnecessary threaded holes and small characteristic areas (small chamfers, fillets and the like) under the condition of not influencing the operation precision; and checking whether the three-dimensional structure model has structural characteristics such as interference, unconstrained parts and the like which are easy to make mistakes during grid division and calculation when assembling, and repairing the structural characteristics.
Step S2: a finite element model of the ball-borne load service cabin is established in Ansys software, the frame structure material of the ball-borne load service cabin is set to be non-linear aluminum, the buffer device is made of pulp material, and the ground is assumed to be rigid material.
Specifically, in the step, the structural material of the framework of the ball-borne load service cabin is set to be non-linear aluminum in an self-contained material library of the Ansys software, and the mechanical parameters are set to be default; looking up corresponding literature data, and manually inputting various mechanical property parameters of the material pulp of the buffer device; the floor material is a rigid material.
Step S3: the ball load service cabin framework is defined as an explicit dynamics unit beam161, and the buffer device is defined as an explicit dynamics unit solid 164.
In this step, the cell types manually input into the structural model of the ball load service cabin are used, the frame of the ball load service cabin is defined as a 3-node display dynamics cell beam161, and the buffer device is an 8-node display dynamics cell solid 164.
Wherein the commands means: in the ansys workbench interface, no option which can be given to the part by selecting the cell type in the ansys APDL is available, and if the function of the APDL is realized in the WB environment, the function of giving the cell type in the cell can be realized only by selecting the model which is required to be given to the specified cell type and using the commands command option.
Note: step S2 and step S3 are not in sequence, but step S2 and step S are both after step S1.
Step S4: and (3) setting the contact type of the overall structure model: the buffer device and the ball-loaded service cabin frame are defined as binding constraints, the buffer device and the ball-loaded service cabin frame and the ground are defined as friction constraints, the friction coefficient is set to be 0.5, and the dynamic coefficient is set to be 0.15.
In the step, a contact surface of the spherical load service compartment, which can generate friction motion in the falling process, is set. Specifically, the ball-mounted load service cabin framework is packaged into a part (part) to form a whole, so that the whole operation is facilitated, the analysis efficiency is improved, an assembly body formed by parts of the same material and unit is combined into a part, and when the material and the unit are given, the assigned material and unit attributes of all parts before packaging can be given only by operating the part; the buffer device is arranged at the bottom of the ball-borne load service cabin, and the buffer device and the ball-borne load service cabin frame are defined as binding constraints; when the four supporting beams of the buffer device and the ball-borne load service cabin fall, the four supporting beams can be in contact with the ground and can topple over after impact occurs, the buffer device and the ball-borne load service cabin frame (namely, the four supporting beams) and the ground are defined as friction constraint, the grassland is used as an actual material of the ground, the friction coefficient of the buffer device and the ball-borne load service cabin frame (namely, the four supporting beams) and the friction coefficient of the buffer device and the ball-borne load service cabin frame (namely, the four supporting beams) are fixed to be 0.5, the dynamic coefficient of the buffer device and the ball-borne load service cabin frame is fixed to be 0.15, and the setting of simulation operation conditions is in accordance with the reality.
Step S4 is to set the contact type of the analysis model, and in the WB operation environment, if the contact setting is not performed, the system defaults that all the surfaces of all the parts that are in contact are bound (i.e., there is no relative movement after the external load is applied). Therefore, the contact surface of the cabin body which can generate friction motion in the falling process needs to be set, so that the setting of the simulation operation condition accords with the reality. In the test, the contact state of each component of the ball load service cabin is checked based on the structural contact condition of the ball load service cabin to obtain a check result, and if the contact state between the components is lacked in the check result, the contact type of the corresponding component is set.
Step S5: and (4) carrying out mesh division on the overall structure model, checking the quality of the overall mesh, and continuously optimizing the mesh to obtain a final finite element model. In the optimization, the overall grid quality is made to be within the unit quality, the aspect ratio and the Jacobian three-item inspection index warning value. In the step, during the primary analysis, coarse meshing is used, so that the meshing time can be reduced, the whole analysis time can be saved, the speed of finite element analysis can be improved, and the analysis result can be obtained quickly. As shown in fig. 2, a diagram of the meshing result of the overall structure model is shown. Wherein, the three inspection indexes of unit mass, aspect ratio and jacobian have the following meanings:
unit mass: except for line units and point units, calculating a unit quality factor in the model based on the ratio of the volume of a given unit to the side length, wherein the range is 0-1, 1 represents a perfect square or cube, and the average unit quality of the whole grid in the test is considered to be qualified within 0.75-1.
Aspect ratio: the length-width ratio is calculated for the triangular or quadrilateral vertexes of the unit, for small boundaries, curved shapes, thin characteristics, sharp angles and the like, some sides of the generated mesh are longer than other sides, the ideal length-width ratio is 1, and the acceptable range of the average length-width ratio of the whole mesh in the test is less than 15.
Jacobi: the quadratic element can be matched with the bending geometry more accurately than the linear element, so that the distorted element is easy to generate at the position with large curvature, the value is 1, the best value is obtained, and the acceptable range of the average Jacobian value of the whole grid in the test is less than or equal to 30.
Step S6: and applying an initial velocity of 7m/s vertically downwards and applying a gravity acceleration g to the final finite element model after the meshing except the ground is finished. In order to reduce the calculated amount and improve the analysis efficiency, instrument and equipment models installed in the ball load service cabin are removed, the respective mass is equivalent to force load, and the force load acts on each installation contact surface in an application mode of uniformly distributed load. The ground is defined as a rigid constraint that does not change in 6 degrees of freedom throughout the analysis.
After the flight test of the ball-borne load service cabin is finished, the ball-borne load service cabin can be descended to the ground to cut the ball at a certain height, a parachute is opened, the speed of the ball-borne load service cabin before falling to the ground is about 7m/s according to the previous monitoring data of the ball-borne load service cabin, and the speed is used as the initial speed of the ball-borne load service cabin to serve as an input condition; and a certain gap is reserved between the ball-loaded load service cabin and the ground during modeling so as to simulate the whole cabin falling impact process.
Step S7: obtaining an equivalent stress distribution cloud picture and a displacement deformation distribution cloud picture of the overall structure model of the ball-borne load service cabin after being impacted so as to measure whether the structure of the ball-borne load service cabin meets the falling requirement or not; when the falling requirement is met, the grid optimization is carried out on the whole structure model according to the finite element grid inspection standard, and the accuracy of an analysis result is improved.
Specifically, in this step, the analysis time is set to 0.06s, 100 equal spatial distribution points are taken as output results, and solution calculation is performed by Ansys Ls-Dyna software.
As shown in fig. 3, an equivalent stress distribution cloud map of the overall structural model after the ball-borne load service bay is impacted is obtained, where (a) is an equivalent stress cloud map when t is 0.0126s, and (b) is an equivalent stress cloud map when t is 0.0306 s. And judging whether the mounting support beam position of each instrument and equipment of the ball-borne load service cabin exceeds the bearable maximum stress according to the color of the equivalent stress cloud chart, and measuring whether the structure of the ball-borne load service cabin meets the falling requirement or not according to the strength. Comparing the maximum stress which can be borne by the material used in the area, and further analyzing whether the instrument equipment is damaged or not, wherein if the maximum stress exceeds the allowable stress of the material used in the area, the requirement of falling is not met; if the allowable stress of the material used in this area is not exceeded, the drop requirement is met.
As shown in fig. 4, a cloud image of the displacement and deformation distribution of the overall structural model after the ball-borne load service bay is impacted is obtained, where (a) is a displacement cloud image when t is 0.0126s, and (b) is a displacement cloud image when t is 0.0306 s. And checking whether a large deformation area exists except the four support beams of the buffer device and the ball-borne load service cabin according to the displacement deformation distribution cloud chart of the integral structure model, so that whether the structure of the ball-borne load service cabin meets the falling requirement is measured by rigidity.
The method mainly analyzes the stress distribution condition of the whole load cabin at the moment when the ball-borne load service cabin is contacted with the ground in the falling process so as to verify the structural impact resistance of the load cabin, thereby protecting the instruments and equipment installed in the cabin from being damaged and smoothly recycling the instruments and equipment after the test is finished.
According to the drop analysis method of the ball-borne load service cabin based on the Ansys Ls-Dyna, the finite element model of the ball-borne load service cabin is established based on the Ansys software platform for drop analysis, actual equipment does not need to be produced for testing, the testing cost is reduced, the test model and the testing environment are more convenient to build, digital simulation and analysis of the drop of the ball-borne load service cabin are realized, and the analysis result is more effective. As can be seen from the picture in FIG. 5, the cabin body of the ball-loaded load service cabin has a good structure, the cabin door can be normally opened and closed after the load is subjected to the power-on test after the load falls, and the performance is good. Thereby demonstrating the feasibility of the process of the present invention.
Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A falling analysis method of a ball-borne load service cabin based on Ansys Ls-Dyna is characterized by comprising the following steps:
step 1: establishing a three-dimensional structure model of the ball-borne load service cabin in CAD software, and preprocessing the three-dimensional structure model to obtain a ball-borne load service cabin structure model;
step 2: establishing a finite element model of the ball-borne load service cabin in Ansys software, setting a frame structure material of the ball-borne load service cabin as a nonlinear aluminum material, setting a buffer device as a pulp material, and assuming the ground as a rigid material;
step S3: defining a ball load service cabin frame as an explicit dynamics unit beam161, and defining a buffer device as an explicit dynamics unit solid 164;
step S4: and (3) setting the contact type of the overall structure model: the buffer device and the ball-borne load service cabin frame are defined as binding constraints, the buffer device and the ball-borne load service cabin frame and the ground are defined as friction constraints, the friction coefficient is set to be 0.5, and the dynamic coefficient is set to be 0.15;
step S5: carrying out mesh division on the integral structure model, checking the quality of the integral mesh, and continuously optimizing the mesh to obtain a final finite element model;
step S6: applying an initial velocity of 7m/s vertically downwards and applying a gravity acceleration (g) to the final finite element model after the meshing except the ground is finished; and
step S7: obtaining an equivalent stress distribution cloud picture and a displacement deformation distribution cloud picture of the integral structure model after the ball-borne load service cabin is impacted so as to measure whether the structure of the ball-borne load service cabin meets the falling requirement or not; and when the falling requirement is met, carrying out grid optimization on the integral structure model according to the finite element grid inspection standard.
2. The method for drop analysis of an Ansys Ls-Dyna-based ball load service bay as claimed in claim 1, wherein the step S1 of building a three-dimensional structure model of the structure of said ball load service bay using solid works three-dimensional structure software and preprocessing said three-dimensional structure model comprises: simplifying the three-dimensional structure model, omitting in-cabin instruments and equipment, and marking the installation contact surface of each instrument and equipment by using a parting line; removing unnecessary threaded holes and small characteristic areas under the condition of not influencing the operation precision; and checking whether the three-dimensional structure model has structural characteristics which are easy to make mistakes during grid division and calculation when the three-dimensional structure model is assembled, and repairing the structural characteristics.
3. The method for drop analysis of an Ansys Ls-Dyna based ball load service capsule as claimed in claim 1, wherein in step S2, said ball load service capsule frame construction material is set in Ansys software self-contained material library, and each mechanical property parameter of pulp material of the buffer device is manually inputted.
4. The method for drop analysis of an Ansys Ls-Dyna-based ball load service pod according to claim 1, wherein in step S3, the ball load service pod frame is defined as 3-node display dynamics unit beam161 using the cell type of the commands manual input model, and the buffer device is an 8-node explicit dynamics unit solidd 164.
5. The method for drop analysis of an Ansys Ls-Dyna based ball-carried load service capsule according to claim 1, wherein in step S4, said ball-carried load service capsule frame is packaged as one part (part) as a whole, and said buffer device is installed at the bottom of said ball-carried load service capsule and takes the grassy soil as the actual material of the ground.
6. The method for analyzing the crash of an Ansys Ls-Dyna based ball borne load service bay according to claim 1, wherein in step S5, the grid is continuously optimized such that the quality of said entire grid is within the three inspection target warning values of cell mass, aspect ratio and jacobian, wherein the average cell mass of said entire grid is considered to be acceptable between 0.75 and 1, the acceptable range of the average aspect ratio of said entire grid is less than 15, and the acceptable range of the average jacobian value of said entire grid is less than or equal to 30.
7. The method for drop analysis of an Ansys Ls-Dyna based ball load service capsule according to claim 1, wherein in step S6, the models of the instruments and equipment installed in said ball load service capsule are removed, their respective masses are equivalent to force loads, and they are applied to the respective installation contact surfaces by means of uniform load application, wherein the ground is defined as a rigid constraint that does not change in 6 degrees of freedom during the whole analysis process.
8. The method for drop analysis of an Ansys Ls-Dyna based ball borne load service bay as claimed in claim 1, wherein in step S7, the analysis time is set to 0.06S, 100 equispatial distribution points are taken as output results, and the solution calculation is performed by the Ansys Ls-Dyna software.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115374667A (en) * | 2022-08-04 | 2022-11-22 | 北京建工集团有限责任公司 | Inverse analysis method based on influence of steel structure construction deformation on structure design performance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115374667A (en) * | 2022-08-04 | 2022-11-22 | 北京建工集团有限责任公司 | Inverse analysis method based on influence of steel structure construction deformation on structure design performance |
| CN115374667B (en) * | 2022-08-04 | 2023-09-12 | 北京建工集团有限责任公司 | Inverse analysis method based on influence of steel structure construction deformation on structural design performance |
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