CN116894362A - Air bridge simulation analysis method of parameterized model, electronic equipment and storage medium - Google Patents
Air bridge simulation analysis method of parameterized model, electronic equipment and storage medium Download PDFInfo
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Abstract
An air bridge simulation analysis method of a parameterized model, electronic equipment and a storage medium belong to the technical field of wind tunnel test design. The air bridge simulation analysis method is convenient to operate and easy to calculate. The application sets air bridge simulation model parameters based on an L-shaped air bridge, and comprises overall layout parameters of the air bridge simulation model and local size parameters of the air bridge simulation model, and performs validity detection to construct a parameterized air bridge simulation model; loading the wind tunnel test load parameters, and carrying out verification analysis on the parameterized air bridge simulation model; and extracting sensitive parameters from the simulation model verification analysis result by using a parameter sensitivity analysis method to obtain a sensitive parameter list, performing air bridge simulation analysis of the parameterized model, and optimizing the simulation analysis result by using a response surface optimization method. The application completes the full-automatic establishment of the model by modifying parameters, realizes the automatic implementation of finite element simulation and the automatic extraction of calculation results through the method for establishing the parameterized model.
Description
Technical Field
The application belongs to the technical field of wind tunnel test design, and particularly relates to an air bridge simulation analysis method of a parameterized model, electronic equipment and a storage medium.
Background
In the dynamic simulation wind tunnel test, in order to simulate the gas injection state when the engine is operated, high-pressure driving gas is required to be introduced from the outside, and the introduction of the gas means that a pipeline must be connected to a model. The normal force measuring system has the force transmission route of the load to be transmitted only through the force measuring system, and the existence of the gas transmission pipeline is equivalent to the increase of the force transmission route, so that part of the load of the model is transmitted through the gas transmission pipeline, and a certain interference is generated on the force measuring system, and the interference amount depends on the rigidity ratio of the air bridge to the balance. For high-precision tests, the disturbance is expected to be reduced as much as possible, so that how to reduce the rigidity of a gas pipeline and reduce the disturbance of a gas pipeline to the force measurement result of a model balance are key technical problems to be solved, the technical approach for solving the problems is to install an air bridge on a high-pressure gas supply pipeline, the air bridge can be essentially regarded as a pipeline which is specially designed, the rigidity of the air bridge is regulated very little on the basis of ensuring the strength, and when the rigidity of the air bridge is lower than the balance of the force measurement system to a certain extent, the disturbance of the gas pipeline to the force measurement system can be ignored when the rigidity is lower than the measurement error of the system. From the above discussion, the performance of the air bridge is a key element affecting the success or failure of the test. Therefore, the air bridge and the balance are designed with the important and difficult points that the rigidity is matched, but the balance is limited by the design conditions such as precision, sensitivity and the like, the rigidity is increased in a limited space, and the important point of adjustment is to optimize the structure of the air bridge and reduce the rigidity as much as possible.
The traditional method mainly optimizes the structure of the air bridge by a trial-and-error method, and because the trial-and-error method needs to repeatedly perform operations such as modeling, analysis, loading and analysis, and the like, and because the factors influencing the air bridge are too many and the points needing trial-and-error are too many, the traditional method has the problems of long period and high cost, and the optimization result is usually not ideal, the aim that the influence of the air bridge on the half-mode balance measurement value is less than 3 per mill is difficult to achieve.
The difficulty with air bridge designs is mainly manifested in that stiffness requirements and strength requirements are contradictory. In the design of the air bridge, on one hand, the rigidity requirement is required, namely, the air bridge is enough soft, larger interference force can not be generated on the force measuring element, on the other hand, the strength requirement is met, gas with higher pressure in the air bridge passes through at a high speed, and the air bridge has enough strength to ensure the safety. Contradictory design requirements create the goal of optimizing through multiple test protocols. In the air bridge design, although the performance of the air bridge can be verified through a structural finite element simulation means, the evaluation of a certain determination scheme can be completed. However, the number of the alternatives becomes very large due to the change of parameters such as geometric parameters of flexible joints, geometric parameters of corrugated pipes, layout position parameters and the like, and the optimal scheme is difficult to find in a plurality of alternatives by a simple trial and error method.
Disclosure of Invention
The application aims to solve the problems of convenient operation and simple calculation of an air bridge simulation analysis method, and provides an air bridge simulation analysis method of a parameterized model, electronic equipment and a storage medium.
In order to achieve the above purpose, the present application is realized by the following technical scheme:
an air bridge simulation analysis method of a parameterized model comprises the following steps:
s1, setting parameters of an air bridge simulation model based on an L-shaped air bridge, wherein the parameters comprise overall layout parameters of the air bridge simulation model and local size parameters of the air bridge simulation model;
s2, detecting the effectiveness of the air bridge simulation model parameters set in the step S1;
s3, constructing a parameterized air bridge simulation model based on the air bridge simulation model parameters subjected to the effectiveness detection in the step S2;
s4, loading the wind tunnel test load parameters based on the parameterized air bridge simulation model constructed in the step S3, and performing parameterized air bridge simulation model verification analysis to obtain a parameterized air bridge simulation model loaded with the wind tunnel test load parameters;
s5, extracting sensitive parameters from the parameterized air bridge simulation model loaded with the wind tunnel test load parameters in the step S4 by using a parameter sensitivity analysis method to obtain a sensitive parameter list;
s6, inputting the sensitive parameter list obtained in the step S5 into a parameterized air bridge simulation model for screening, performing simulation analysis on the screened parameterized air bridge simulation model, and optimizing by adopting a response surface optimization method.
Further, the specific implementation method of the step S1 includes the following steps:
s1.1, setting an air bridge as an L-shaped air bridge, setting a long arm of the air bridge as an X-axis, setting a short arm of the air bridge as a Y-axis, and setting a flexible joint on the air bridge, wherein the center of the flexible joint is coincident with the axis of the air bridge, the flexible joint is arranged in a manner that a first flexible joint and a second flexible joint are arranged on the long arm of the air bridge, and a third flexible joint is arranged on the short arm of the air bridge;
s1.2, setting overall layout parameters of an air bridge simulation model, wherein the overall layout parameters comprise the length of a long arm of the air bridge as followsThe short arm length of the air bridge is +.>The radius of the corner of the air bridge is R, the distance between the first flexible joint and the origin of coordinates is set to be +.>The distance between the second flexible joint and the origin of coordinates is +.>The distance between the third flexible joint and the origin of coordinates is +.>The first flexible joint, the second flexible joint and the third flexible joint are the same in size;
s1.3, setting local size parameters of the air bridge simulation model, wherein the local size parameters comprise the total length of the flexible joint is set asThe inner diameter of the flexible joint is set to be->The outer diameter of the flexible joint is set to->The width of the disturbance eliminating beam is set to +.>The length of the disturbance eliminating beam is set to +.>The thickness of the disturbance eliminating beam is set to +.>Disturbance eliminating beam thickness->Set to->The thickness of the corrugated pipe flange is set as B, the total length of the corrugated pipe is set as L, and the effective node length is set as +.>The thickness of the corrugated pipe is set to be Zh, and the radius of the inner ring of the corrugated pipe is set to be +.>The radius of the outer ring of the corrugated pipe is set as D, the pitch of the nodes is set as t, the single-node distance of the waves of the corrugated pipe is set as a, and the waves areThe transition radius of the vein tube is set as. The radius of the corrugated pipe wave ring is set to be +>。
Further, the specific implementation method of the step S2 includes the following steps:
s2.1, detecting the validity of the overall layout parameters of the air bridge simulation model: detecting that the flexible joint position is in the air bridge pipeline range, and for the flexible joint arranged on the long arm of the air bridge, calculating the expression as follows:
；
；
for a flexible joint placed on the short arm of an air bridge, the expression is calculated as:
；
s2.2, detecting the validity of local size parameters of the air bridge simulation model:
s2.2.1, the number of nodes of the detection corrugated pipe is even, and the calculation expression is as follows:
；
wherein n is a positive integer;
s2.2.2, detecting that the effective node length of the corrugated pipe is smaller than the total length of the corrugated pipe, and calculating the expression as follows:
；
s2.2.3, detect the clearance of the last ripples circle of bellows and ripples circle down, have 2mm at least distance, the computational expression is:
；
s2.2.4, the thickness of the detection corrugated pipe is smaller than 10% of the radius of the wave ring, and the calculation expression is as follows:
；
s2.2.5, detecting that the outer diameter of the flexible joint is larger than the inner diameter, and calculating the expression as follows:
；
s2.2.6, detect the interference cancellation roof beam root and have at least 2mm thickness apart from the flange, the computational expression is:
；
s2.2.7, the outer diameter of the detection corrugated pipe is smaller than the inner diameter of the flexible joint, and the calculation expression is as follows:
；
s2.2.8, detecting the coincidence of the connecting position of the corrugated pipe boundary and the flexible joint, wherein the calculation expression is as follows:
；
s2.3, detecting material parameters of the corrugated pipe, including elastic modulus E and Poisson ratio。
Further, in step S3, a parameterized air bridge simulation model is built by using a parameterized model building method based on ANSYS Design Modeler, and the specific implementation method includes the following steps:
s3.1, dividing grids: dividing grids in an ANSYS Mechanical;
s3.2, modeling the corrugated pipe by adopting a shell unit;
and S3.3, modeling the flexible joint by adopting a solid unit.
Further, the specific implementation method of the step S4 includes the following steps:
s4.1, loading wind tunnel test load parameters based on the parameterized air bridge simulation model constructed in the step S3, wherein the wind tunnel test load parameters comprise pressure, model aerodynamic force and moment, the pressure is loaded on all pressed surfaces including corrugated pipes, the model aerodynamic force is loaded on a movable end of an air bridge, and the moment is loaded on the end face of the movable end of the air bridge;
s4.2, verifying the parameterized air bridge simulation model based on the wind tunnel test load parameters loaded in the step S4.1, and testing whether the parameterized air bridge simulation model works normally or not and identifying parameters correctly;
and S4.3, carrying out verification analysis on the parameterized air bridge simulation model based on the wind tunnel test load parameters loaded in the step S4.1 to obtain a support reaction load simulation analysis result, a stress simulation analysis result and a deformation simulation analysis result, and outputting a simulation analysis result file to obtain the parameterized air bridge simulation model loaded with the wind tunnel test load parameters.
Further, the specific implementation method of the step S5 includes the following steps:
s5.1, constructing a sensitivity index in a parameter sensitivity analysis method as a first-order index: measuring contributions to the output variance by only a single input;
s5.2, analyzing by adopting an One-at-a-time parameter sensitivity analysis method, changing One variable each time in the analysis process, keeping the baseline value of other variables, returning the changed variable to the nominal value, comparing output results, performing sensitivity analysis on modeling parameters, material parameters and load parameters, extracting sensitive parameters with strong influence on the results, and obtaining a sensitive parameter list; the parameter sensitivity analysis method is to observe the variation degree of the model output caused by changing the parameters in the parameterized air bridge simulation model loading the load parameters of the wind tunnel test, and the calculation expression is as follows:
；
wherein t is an independent variable, r is a variable,sensitivity of t to r>For the variation of the variables>Is the amount of change in the argument.
The electronic equipment comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the steps of the air bridge simulation analysis method of the parameterized model when executing the computer program.
A computer readable storage medium having stored thereon a computer program which when executed by a processor implements the method of air bridge simulation analysis of a parameterized model.
The application has the beneficial effects that:
according to the air bridge simulation analysis method of the parameterized model, the parameterized model is established, the full-automatic establishment of the model is completed through modification of parameters, the automatic implementation of finite element simulation (loading, grid division, solving and the like) is realized, and the automatic extraction of calculation results is realized. The air bridge performance optimization problem is converted into a parameter optimization mathematical problem, so that a black box type air bridge performance evaluation method is formed, a designer can obtain an output result only by focusing on input parameters, and the modeling process, the finite element simulation process and the data extraction process are all automated, so that the evaluation and comparison of the performance of a plurality of schemes are rapidly and conveniently completed. The most sensitive parameters affecting the performance of the air bridge can be searched through an optimization method, so that efficient design iteration is realized.
Drawings
FIG. 1 is a flow chart of a parameterized model air bridge simulation analysis method according to the present application;
FIG. 2 is a schematic diagram of an L-shaped air bridge of a parameterized model of the air bridge simulation analysis method according to the present application;
wherein 1 is a long arm of the air bridge, 2 is a short arm of the air bridge, 3 is a first flexible joint, 4 is a second flexible joint, and 5 is a third flexible joint;
FIG. 3 is a schematic view of a flexible joint structure of an L-shaped air bridge of the air bridge simulation analysis method of the parameterized model;
wherein 6 is a corrugated pipe, 7 is a disturbing beam, and 8 is a flange;
FIG. 4 is a schematic diagram of a bellows structure of an L-shaped air bridge of the air bridge simulation analysis method of a parameterized model according to the present application;
FIG. 5 is a graph showing the change of the air bridge system support reaction force along with the Young modulus change of the material and the change along with the pneumatic load action point of the air bridge simulation analysis method of the parameterized model.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings and detailed description. It should be understood that the embodiments described herein are for purposes of illustration only and are not intended to limit the application, i.e., the embodiments described are merely some, but not all, of the embodiments of the application. The components of the embodiments of the present application generally described and illustrated in the figures herein can be arranged and designed in a wide variety of different configurations, and the present application can have other embodiments as well.
Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to fall within the scope of the present application.
For further understanding of the application, the following detailed description is to be taken in conjunction with fig. 1-5, in which the following detailed description is given:
the first embodiment is as follows:
the air bridge has the function of introducing high-pressure gas into the test model from the gas source position, wherein an interface of the gas source position is reserved in the design stage of the test section, and cannot be adjusted in the test; the interface at the model is reserved after the test scheme is determined and during model processing, and cannot be adjusted in the test. The port of the air bridge to the air supply location is called the fixed end, since the rigidity at the wall plate is very good and can be considered as fixed; the location of the connection to the air inlet interface of the mould is called the active end, because the rigidity at the mould is relatively poor and a certain displacement occurs under load. Therefore, the layout of the air bridge is limited by the positions of the fixed end and the movable end of the pipeline, the layout form is required to be determined according to the position relation of the two interfaces, if the air source interface and the model air inlet interface have a large height difference, the L-shaped air bridge is suitable to be adopted, the L-shaped air bridge is taken as an example in the embodiment, and how to optimize the performance of the air bridge under the condition of determining the layout is studied, so that the requirements of rigidity and strength are simultaneously met.
An air bridge simulation analysis method of a parameterized model comprises the following steps:
s1, setting parameters of an air bridge simulation model based on an L-shaped air bridge, wherein the parameters comprise overall layout parameters of the air bridge simulation model and local size parameters of the air bridge simulation model;
further, the specific implementation method of the step S1 includes the following steps:
s1.1, setting an air bridge as an L-shaped air bridge, setting a long arm of the air bridge as an X-axis, setting a short arm of the air bridge as a Y-axis, and setting a flexible joint on the air bridge, wherein the center of the flexible joint is coincident with the axis of the air bridge, the flexible joint is arranged in a manner that a first flexible joint and a second flexible joint are arranged on the long arm of the air bridge, and a third flexible joint is arranged on the short arm of the air bridge;
s1.2, setting overall layout parameters of an air bridge simulation model, wherein the overall layout parameters comprise the length of a long arm of the air bridge as followsAir bridgeIs +.>The radius of the corner of the air bridge is R, the distance between the first flexible joint and the origin of coordinates is set to be +.>The distance between the second flexible joint and the origin of coordinates is +.>The distance between the third flexible joint and the origin of coordinates is +.>The first flexible joint, the second flexible joint and the third flexible joint are the same in size;
s1.3, setting local size parameters of the air bridge simulation model, wherein the local size parameters comprise the total length of the flexible joint is set asThe inner diameter of the flexible joint is set to be->The outer diameter of the flexible joint is set to->The width of the disturbance eliminating beam is set to +.>The length of the disturbance eliminating beam is set to +.>The thickness of the disturbance eliminating beam is set to +.>Disturbance eliminating beam thickness->Set to->The thickness of the corrugated pipe flange is set as B, and the total length of the corrugated pipe is setFor L, the effective node length is set to +.>The thickness of the corrugated pipe is set to be Zh, and the radius of the inner ring of the corrugated pipe is set to be +.>The radius of the outer ring of the corrugated pipe is set as D, the pitch of the nodes is set as t, the single-node distance of the corrugated pipe is set as a, and the transition radius of the corrugated pipe is set as. The radius of the corrugated pipe wave ring is set to be +>；
Further, the inlet end and the outlet end of the air bridge are fixed, and the sizes of all flexible joints are consistent; the flexible joint is of a symmetrical structure, has a geometric center and a central axis, and has a symmetrical plane perpendicular to the central axis; the central line of the flexible joint coincides with the axis of the pipeline;
s2, detecting the effectiveness of the air bridge simulation model parameters set in the step S1;
further, the specific implementation method of the step S2 includes the following steps:
s2.1, detecting the validity of the overall layout parameters of the air bridge simulation model: detecting that the flexible joint position is in the air bridge pipeline range, and for the flexible joint arranged on the long arm of the air bridge, calculating the expression as follows:
；
；
for a flexible joint placed on the short arm of an air bridge, the expression is calculated as:
；
s2.2, detecting the validity of local size parameters of the air bridge simulation model:
s2.2.1, the number of nodes of the detection corrugated pipe is even, and the calculation expression is as follows:
；
wherein n is a positive integer;
s2.2.2, detecting that the effective node length of the corrugated pipe is smaller than the total length of the corrugated pipe, and calculating the expression as follows:
；
s2.2.3, detect the clearance of the last ripples circle of bellows and ripples circle down, have 2mm at least distance, the computational expression is:
；
s2.2.4, the thickness of the detection corrugated pipe is smaller than 10% of the radius of the wave ring, and the calculation expression is as follows:
；
s2.2.5, detecting that the outer diameter of the flexible joint is larger than the inner diameter, and calculating the expression as follows:
；
s2.2.6, detect the interference cancellation roof beam root and have at least 2mm thickness apart from the flange, the computational expression is:
；
s2.2.7, the outer diameter of the detection corrugated pipe is smaller than the inner diameter of the flexible joint, and the calculation expression is as follows:
；
s2.2.8, detecting the coincidence of the connecting position of the corrugated pipe boundary and the flexible joint, wherein the calculation expression is as follows:
；
s2.3, detecting material parameters of the corrugated pipe, including elastic modulus E and Poisson ratio；
S3, constructing a parameterized air bridge simulation model based on the air bridge simulation model parameters subjected to the effectiveness detection in the step S2;
further, in step S3, a parameterized air bridge simulation model is built by using a parameterized model building method based on ANSYS Design Modeler, and the specific implementation method includes the following steps:
s3.1, dividing grids: dividing grids in an ANSYS Mechanical;
s3.2, modeling the corrugated pipe by adopting a shell unit;
s3.3, modeling the flexible joint by adopting a solid unit;
further, meshing: the division of the mesh is completed in ANSYS Mechanical, and the corrugated pipe is modeled by adopting a shell unit, because the ratio of the thickness to the diameter is only 0.4%, and is a typical thin-wall element, and the mesh quantity of the finite element model is obviously increased (the mesh quantity is probably in the order of millions of meshes) by adopting a solid unit, so that the simulation is a very feasible and effective method by adopting the shell unit for a thin-wall structure, the error of the simplified method is almost negligible, but huge calculation resources (the mesh quantity is about 7 ten thousand and is about 7% of the mesh quantity of the solid unit) can be saved. For the division of the corrugated pipe grids, firstly, enough grid density is ensured, so that the finite element model can accurately model the behavior of the corrugated pipe, and secondly, the grids are ensured to have enough perfect symmetry, so that the interference force caused by pressure can be accurately calculated. The model simulation of the flexible joint is mainly concentrated on the strain beam, and the flexible joint is modeled by adopting a solid unit, so that the strain beam mainly bears bending load, three aspects of contents are ensured during simulation, firstly, the division of at least two layers of grids in the thickness direction is ensured, and the influence of the tensile load on the upper surface and the lower surface can be accurately captured; secondly, enough grid quantity in the axial direction is ensured, and a deformation curve of the strain beam can be accurately simulated; finally, the strain beams of each flexible joint are ensured to have the same grid division, so that the flexible joints have better symmetry;
s4, loading the wind tunnel test load parameters based on the parameterized air bridge simulation model constructed in the step S3, and performing parameterized air bridge simulation model verification analysis to obtain a parameterized air bridge simulation model loaded with the wind tunnel test load parameters;
further, the specific implementation method of the step S4 includes the following steps:
s4.1, loading wind tunnel test load parameters based on the parameterized air bridge simulation model constructed in the step S3, wherein the wind tunnel test load parameters comprise pressure, model aerodynamic force and moment, the pressure is loaded on all pressed surfaces including corrugated pipes, the model aerodynamic force is loaded on a movable end of an air bridge, and the moment is loaded on the end face of the movable end of the air bridge;
further, pressure is applied to all pressurized surfaces including the bellows, simulating the pressure effect of high pressure gas flowing through the wave circuit. The method is characterized in that the whole corrugated pipe surface is applied in a special care, for automatic loading of the corrugated pipe pressure surface, the number of the corrugated pipes with different parameters is changed, so that the geometric entity of the corrugated pipe is selected when the load is applied automatically, the selection is converted into the surface of the entity, and the corrugated pipe adopts surface unit modeling, so that the surface is the pressure surface needing to be loaded; a force load applied to the movable end of the air bridge, the concentrated force being connected to the movable end in an MPC manner, comprising a position of a force center (three position coordinates), magnitudes of three components of the force; moment load, the size of three directions, apply to the terminal surface of the movable end;
s4.2, verifying the parameterized air bridge simulation model based on the wind tunnel test load parameters loaded in the step S4.1, and testing whether the parameterized air bridge simulation model works normally or not and identifying parameters correctly;
further, whether the parameterized system can work normally or not needs to be tested, whether the parameter can be identified correctly or not is detected by the system, a plurality of groups of geometric parameters and finite element input parameters are selected randomly, after the parameters are updated, whether the geometric parameters and the finite element parameters are correct or not is detected in finite element software, calculation is started after the geometric parameters and the finite element parameters are confirmed to be correct, and under the action of unit load, a non-parameterized model of the same load is compared by the verification model to see whether an output result is correct or not. After the system is verified to be correct, the next work can be performed;
s4.3, carrying out verification analysis on the parameterized air bridge simulation model based on the wind tunnel test load parameters loaded in the step S4.1 to obtain a support reaction load simulation analysis result, a stress simulation analysis result and a deformation simulation analysis result, and outputting a simulation analysis result file to obtain a parameterized air bridge simulation model loaded with the wind tunnel test load parameters;
s5, extracting sensitive parameters from the parameterized air bridge simulation model loaded with the wind tunnel test load parameters in the step S4 by using a parameter sensitivity analysis method to obtain a sensitive parameter list;
the parameter sensitivity analysis is to find the parameters with higher weight of influence on the result, namely one-time screening, and the parameters with stronger influence on the result are kept to enter the subsequent optimization analysis, the difficulty degree of the optimization analysis is sensitive to the number of input parameters, and the calculated amount of the optimization problem is increased in geometric grade due to the increase of the number of the input parameters, so that the parameters with slight influence are required to be filtered first, and the main contradiction is grasped for analysis.
Sensitivity analysis is "how uncertainty in the output of a study mathematical model or system (numerical or otherwise) is assigned to different sources of uncertainty in the input. The sensitivity of each input is typically represented by a numerical value, called the sensitivity index. The sensitivity index takes several forms:
first-order index: the contribution to the output variance is measured by only a single input.
Second order index: measuring the contribution of two input interactions to the output variance
Total order index: the contribution of the model input to the output variance is measured, including its first order effects (input individual changes) and all higher order interactions.
Further, the specific implementation method of the step S5 includes the following steps:
s5.1, constructing a sensitivity index in a parameter sensitivity analysis method as a first-order index: measuring contributions to the output variance by only a single input;
s5.2, analyzing by adopting an One-at-a-time parameter sensitivity analysis method, changing One variable each time in the analysis process, keeping the baseline value of other variables, returning the changed variable to the nominal value, comparing output results, performing sensitivity analysis on modeling parameters, material parameters and load parameters, extracting sensitive parameters with strong influence on the results, and obtaining a sensitive parameter list; the parameter sensitivity analysis method is to observe the variation degree of the model output caused by changing the parameters in the parameterized air bridge simulation model loading the load parameters of the wind tunnel test, and the calculation expression is as follows:
；
wherein t is an independent variable, r is a variable,sensitivity of t to r>For the variation of the variables>The amount of change that is an argument;
s6, inputting the sensitive parameter list obtained in the step S5 into a parameterized air bridge simulation model for screening, performing simulation analysis on the screened parameterized air bridge simulation model, and optimizing by adopting a response surface optimization method.
Further, after the sensitive parameters are determined, the screened sensitive parameters are used as input parameters, and the scheme is optimized through a response surface optimization method. Determining test points (namely a calculation working condition) through a center point CCD (charge coupled device) method, determining each parameter value corresponding to each test point, forming a series of parameter value lists, inputting the values in the parameter lists into ANSYS for calculation, obtaining simulation results of each test point, and extracting set output parameters (including the counter force of the fixed end of the air bridge, the stress of the corrugated pipe and the like) to serve as evaluation indexes of the results. The criteria for evaluation were: the smaller the counter-force of the air bridge ends (i.e. the disturbing force of the air bridge) the better in case the stress value is lower than the allowable stress.
The response surface method is to fit an equation through actual data, and the equation can be expressed in a coordinate graph mode, so that the influence of different conditions on a response value can be predicted. The number of parameters determines the dimension of the resulting response surface, and for two parameters the result is a three-dimensional surface in space, and for more than three parameters the result will be a hypersurface. The response curved surface obtained by adopting the center point CCD design method can well predict the trend of the result along with the change of different parameters, and then the optimal solution can be found in the parameter value range.
From fig. 5, it can be seen that the disturbance force of the air bridge system varies with the bellows material and aerodynamic load position, where the horizontal axis is the modulus of elasticity of the material, the vertical axis is the disturbance force generated by the air bridge, the different aerodynamic load positions are represented by different lines,
according to the air bridge simulation analysis method of the parameterized model, a designer only needs to modify and adjust interested parameters according to the input parameter table of EXCEL, then all the alternative schemes of each group are input into software at one time, the software can model, divide grids, load, analyze, calculate and extract data results for the schemes in batches, a worker can submit tasks to the software during working, the software finishes calculation at rest time of the worker, the worker views the scheme effect on the second day, the work efficiency is greatly improved, and the occupancy rate of the worker is remarkably reduced. In the past, from modeling to result evaluation, a period of several days is often required, and at least one person for pneumatic, structural, analysis and the like is required. Only one person is required to evaluate tens of protocols, less than a week. Numerical simulation can find the influence rule of the parameters on the performance in a plurality of parameters through technical means, obtain the parameter sensitivity, find the factor which is most critical to the influence of the performance, which is equivalent to finding the most critical direction for designing the air bridge design.
The second embodiment is as follows:
the electronic equipment comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the steps of the air bridge simulation analysis method of the parameterized model when executing the computer program.
The computer device of the present application may be a device including a processor and a memory, such as a single chip microcomputer including a central processing unit. And the processor is used for realizing the steps of the air bridge simulation analysis method of the parameterized model when executing the computer program stored in the memory.
The processor may be a central processing unit (Central Processing Unit, CPU), other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like; the storage data area may store data (such as audio data, phonebook, etc.) created according to the use of the handset, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart Media Card (SMC), secure Digital (SD) Card, flash Card (Flash Card), at least one disk storage device, flash memory device, or other volatile solid-state storage device.
And a third specific embodiment:
a computer readable storage medium having stored thereon a computer program which when executed by a processor implements the method of air bridge simulation analysis of a parameterized model.
The computer readable storage medium of the present application may be any form of storage medium that is readable by a processor of a computer device, including but not limited to, nonvolatile memory, volatile memory, ferroelectric memory, etc., on which a computer program is stored, and when the processor of the computer device reads and executes the computer program stored in the memory, the steps of an air bridge emulation analysis method of a parameterized model described above may be implemented.
The computer program comprises computer program code which may be in source code form, object code form, executable file or in some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.
It is noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Although the application has been described above with reference to specific embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the features of the disclosed embodiments may be combined with each other in any manner so long as there is no structural conflict, and the exhaustive description of these combinations is not given in this specification solely for the sake of brevity and resource saving. Therefore, it is intended that the application not be limited to the particular embodiments disclosed herein, but that the application will include all embodiments falling within the scope of the appended claims.
Claims (8)
1. The air bridge simulation analysis method of the parameterized model is characterized by comprising the following steps of:
s1, setting parameters of an air bridge simulation model based on an L-shaped air bridge, wherein the parameters comprise overall layout parameters of the air bridge simulation model and local size parameters of the air bridge simulation model;
s2, detecting the effectiveness of the air bridge simulation model parameters set in the step S1;
s3, constructing a parameterized air bridge simulation model based on the air bridge simulation model parameters subjected to the effectiveness detection in the step S2;
s4, loading the wind tunnel test load parameters based on the parameterized air bridge simulation model constructed in the step S3, and performing parameterized air bridge simulation model verification analysis to obtain a parameterized air bridge simulation model loaded with the wind tunnel test load parameters;
s5, extracting sensitive parameters from the parameterized air bridge simulation model loaded with the wind tunnel test load parameters in the step S4 by using a parameter sensitivity analysis method to obtain a sensitive parameter list;
s6, inputting the sensitive parameter list obtained in the step S5 into a parameterized air bridge simulation model for screening, performing simulation analysis on the screened parameterized air bridge simulation model, and optimizing by adopting a response surface optimization method.
2. The method for air bridge simulation analysis of parameterized model according to claim 1, wherein the specific implementation method of step S1 comprises the following steps:
s1.1, setting an air bridge as an L-shaped air bridge, setting a long arm of the air bridge as an X-axis, setting a short arm of the air bridge as a Y-axis, and setting a flexible joint on the air bridge, wherein the center of the flexible joint is coincident with the axis of the air bridge, the flexible joint is arranged in a manner that a first flexible joint and a second flexible joint are arranged on the long arm of the air bridge, and a third flexible joint is arranged on the short arm of the air bridge;
s1.2, setting overall layout parameters of an air bridge simulation model, wherein the overall layout parameters comprise the length of a long arm of the air bridge as followsThe short arm length of the air bridge is +.>The radius of the corner of the air bridge is R, the distance between the first flexible joint and the origin of coordinates is set to be +.>The distance between the second flexible joint and the origin of coordinates is +.>The distance between the third flexible joint and the origin of coordinates is +.>The first flexible joint, the second flexible joint and the third flexible joint are the same in size;
s1.3, setting local size parameters of the air bridge simulation model, wherein the local size parameters comprise the total length of the flexible joint is set asThe inner diameter of the flexible joint is set to be->The outer diameter of the flexible joint is set to->The width of the disturbance eliminating beam is set to +.>The length of the disturbance eliminating beam is set to +.>The thickness of the disturbance eliminating beam is set to +.>Disturbance eliminating beam thickness->Set to->The thickness of the corrugated pipe flange is set as B, the total length of the corrugated pipe is set as L, and the effective node length is set as +.>The thickness of the corrugated pipe is set to be Zh, and the radius of the inner ring of the corrugated pipe is set to be +.>The radius of the outer ring of the corrugated pipe is set as D, the pitch of the nodes is set as t, the single-node distance of the corrugated pipe is set as a, and the transition radius of the corrugated pipe is set as +.>. The radius of the corrugated pipe wave ring is set to be +>。
3. The air bridge simulation analysis method of a parameterized model according to claim 2, wherein the specific implementation method of step S2 comprises the following steps:
s2.1, detecting the validity of the overall layout parameters of the air bridge simulation model: detecting that the flexible joint position is in the air bridge pipeline range, and for the flexible joint arranged on the long arm of the air bridge, calculating the expression as follows:
；
；
for a flexible joint placed on the short arm of an air bridge, the expression is calculated as:
；
s2.2, detecting the validity of local size parameters of the air bridge simulation model:
s2.2.1, the number of nodes of the detection corrugated pipe is even, and the calculation expression is as follows:
；
wherein n is a positive integer;
s2.2.2, detecting that the effective node length of the corrugated pipe is smaller than the total length of the corrugated pipe, and calculating the expression as follows:
；
s2.2.3, detect the clearance of the last ripples circle of bellows and ripples circle down, have 2mm at least distance, the computational expression is:
；
s2.2.4, the thickness of the detection corrugated pipe is smaller than 10% of the radius of the wave ring, and the calculation expression is as follows:
；
s2.2.5, detecting that the outer diameter of the flexible joint is larger than the inner diameter, and calculating the expression as follows:
；
s2.2.6, detect the interference cancellation roof beam root and have at least 2mm thickness apart from the flange, the computational expression is:
；
s2.2.7, the outer diameter of the detection corrugated pipe is smaller than the inner diameter of the flexible joint, and the calculation expression is as follows:
；
s2.2.8, detecting the coincidence of the connecting position of the corrugated pipe boundary and the flexible joint, wherein the calculation expression is as follows:
；
s2.3, detecting material parameters of the corrugated pipe, including elastic modulus E and Poisson ratio。
4. The air bridge simulation analysis method of a parameterized model according to claim 3, wherein the parameterized air bridge simulation model is built by adopting a parameterized model building method based on ANSYS Design Modeler in the step S3, and the specific implementation method comprises the following steps:
s3.1, dividing grids: dividing grids in an ANSYS Mechanical;
s3.2, modeling the corrugated pipe by adopting a shell unit;
and S3.3, modeling the flexible joint by adopting a solid unit.
5. The method for air bridge simulation analysis of parameterized model according to claim 4, wherein the specific implementation method of step S4 comprises the following steps:
s4.1, loading wind tunnel test load parameters based on the parameterized air bridge simulation model constructed in the step S3, wherein the wind tunnel test load parameters comprise pressure, model aerodynamic force and moment, the pressure is loaded on all pressed surfaces including corrugated pipes, the model aerodynamic force is loaded on a movable end of an air bridge, and the moment is loaded on the end face of the movable end of the air bridge;
s4.2, verifying the parameterized air bridge simulation model based on the wind tunnel test load parameters loaded in the step S4.1, and testing whether the parameterized air bridge simulation model works normally or not and identifying parameters correctly;
and S4.3, carrying out verification analysis on the parameterized air bridge simulation model based on the wind tunnel test load parameters loaded in the step S4.1 to obtain a support reaction load simulation analysis result, a stress simulation analysis result and a deformation simulation analysis result, and outputting a simulation analysis result file to obtain the parameterized air bridge simulation model loaded with the wind tunnel test load parameters.
6. The method for air bridge simulation analysis of parameterized model according to claim 5, wherein the specific implementation method of step S5 comprises the following steps:
s5.1, constructing a sensitivity index in a parameter sensitivity analysis method as a first-order index: measuring contributions to the output variance by only a single input;
s5.2, analyzing by adopting an One-at-a-time parameter sensitivity analysis method, changing One variable each time in the analysis process, keeping the baseline value of other variables, returning the changed variable to the nominal value, comparing output results, performing sensitivity analysis on modeling parameters, material parameters and load parameters, extracting sensitive parameters with strong influence on the results, and obtaining a sensitive parameter list; the parameter sensitivity analysis method is to observe the variation degree of the model output caused by changing the parameters in the parameterized air bridge simulation model loading the load parameters of the wind tunnel test, and the calculation expression is as follows:
；
wherein t is an independent variable, r is a variable,sensitivity of t to r>For the variation of the variables>Is the amount of change in the argument.
7. An electronic device comprising a memory and a processor, the memory storing a computer program, the processor implementing the steps of a parameterized model air bridge simulation analysis method according to any of claims 1-6 when executing the computer program.
8. A computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements a parameterized model air bridge simulation analysis method according to any of claims 1-6.
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