CN114580236A - Fatigue analysis method, fatigue analysis device and computer-readable storage medium - Google Patents
Fatigue analysis method, fatigue analysis device and computer-readable storage medium Download PDFInfo
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Abstract
The application discloses a fatigue analysis method, a device and a computer readable storage medium, which belongs to the technical field of engineering machinery, and the fatigue analysis method comprises the following steps: acquiring load data of the simulation arm support in different postures within a preset time; taking the nodes at different times and the load data corresponding to the nodes at different times as boundary conditions of finite element analysis to obtain a plurality of finite element quasi-static analysis results; combining a plurality of finite element quasi-static analysis results according to the time sequence to obtain a finite element dynamic analysis result; and obtaining a fatigue analysis result of the simulated arm support according to the finite element dynamic analysis result. The fatigue analysis method, the fatigue analysis device and the computer readable storage medium can shorten the time consumed by convergence and effectively improve the analysis working efficiency.
Description
Technical Field
The application relates to the technical field of engineering machinery, in particular to a fatigue analysis method and device and a computer readable storage medium.
Background
The forklift has the characteristics of wide operation range, high power and complex structure. The arm support of the forklift is of a telescopic arm structure, the structure is complex, the size is large, and the calculation efficiency is low due to the fact that the problems of nonlinearity, large-scale calculation and the like are encountered during performance calculation. In the prior art, when the conventional finite element dynamic analysis, rigid-flexible coupling and the like are used for analyzing the performance of the boom, the convergence difficulty is high, the efficiency is low or the precision is insufficient, so that the engineering requirements are difficult to meet, and the accurate boom stress and fatigue analysis result is difficult to obtain quickly.
Disclosure of Invention
In order to solve the above technical problem, embodiments of the present application provide a fatigue analysis method, apparatus, and computer-readable storage medium, which can shorten a time period consumed by convergence, and effectively improve analysis work efficiency.
According to an aspect of the present application, there is provided a fatigue analysis method including:
acquiring load data of the simulation arm support in different postures within a preset time;
taking the different time nodes and the load data corresponding to the different time nodes as boundary conditions of finite element analysis to obtain a plurality of finite element quasi-static analysis results;
merging the finite element quasi-static analysis results according to the time sequence to obtain a finite element dynamic analysis result; and
and obtaining a fatigue analysis result of the simulated arm support according to the finite element dynamic analysis result.
According to an aspect of the application, after the obtaining load data of the simulation arm support in different postures within a preset time period, the fatigue analysis method further includes:
forming a load spectrum corresponding to the preset duration according to the load data of the simulation arm frame within the preset duration;
selecting different time nodes and the load data corresponding to the different time nodes according to the load spectrum;
the obtaining of a plurality of finite element quasi-static analysis results by using different time nodes and the load data corresponding to the different time nodes as boundary conditions of finite element analysis comprises:
and taking the selected different time nodes and the load data corresponding to the different time nodes as boundary conditions of finite element analysis to obtain a plurality of finite element quasi-static analysis results.
According to one aspect of the application, the solid arm support comprises a solid stress testing part, and a stress detection device is installed at the solid stress testing part; the simulation arm support comprises a simulation stress test part corresponding to the entity stress test part;
the obtaining of the fatigue analysis result of the simulated arm support according to the finite element dynamic analysis result comprises:
acquiring an actual stress detection result of the entity stress test part after a stress test;
and if the benchmarking precision indexes of the finite element dynamic analysis result of the simulated stress test part and the actual stress detection result of the entity stress test part are within a first preset range, obtaining the fatigue analysis result of the simulated arm support according to the finite element dynamic analysis result of the simulated arm support.
According to an aspect of the application, after obtaining the actual stress detection result of the physical stress testing part after the stress test, obtaining the fatigue analysis result of the simulated boom according to the finite element dynamic analysis result further includes:
if the benchmarking accuracy index of the finite element dynamic analysis result of the simulated stress testing part and the actual stress detection result of the entity stress testing part is not in the first preset range, correcting the finite element analysis model of the simulated arm support so that the benchmarking accuracy index of the corrected finite element dynamic analysis result of the simulated stress testing part and the actual stress detection result of the entity stress testing part is in the first preset range; and
and obtaining a fatigue analysis result of the simulation arm support according to the corrected finite element dynamic analysis result of the simulation arm support.
According to an aspect of the application, after obtaining the actual stress detection result of the physical stress testing part after the stress test, obtaining the fatigue analysis result of the simulated boom according to the finite element dynamic analysis result further includes:
comparing the finite element dynamic analysis result of the simulated stress test part with the actual stress detection result of the entity stress test part to obtain the error between the finite element dynamic analysis result of the simulated stress test part and the actual stress detection result of the entity stress test part; wherein the errors include a maximum error, a mean error, a goodness-of-fit error, and a normalized root mean square error;
and according to the error, obtaining the benchmarking precision indexes of the finite element dynamic analysis result of the simulated stress testing part and the actual stress detection result of the entity stress testing part.
According to one aspect of the application, the solid boom comprises a solid fatigue testing part and a non-fatigue testing part; the simulation arm support comprises a simulation fatigue test part; wherein the simulated fatigue test site corresponds to the physical fatigue test site;
after the fatigue analysis result of the simulation arm support is obtained, the fatigue analysis method further includes:
acquiring an actual fatigue result of the entity fatigue test part after a fatigue test;
and if the error between the actual fatigue result of the entity fatigue test part and the fatigue analysis result of the simulation fatigue test part is within a second preset range, comparing the fatigue analysis result of the simulation fatigue test part with the required service life of the entity fatigue test part, and outputting a signal representing whether the simulation fatigue test part is qualified or unqualified according to the comparison result.
According to an aspect of the application, after the obtaining of the actual fatigue result of the simulated boom after the fatigue test, the fatigue analysis method further includes:
and if the error between the actual fatigue result of the entity fatigue test part and the fatigue analysis result of the simulated fatigue test part is not in a second preset range, correcting the fatigue analysis model of the simulated boom so as to enable the error between the fatigue analysis result of the simulated fatigue test part and the actual fatigue result of the entity fatigue test part to be in the second preset range.
According to one aspect of the application, after the outputting the signal characterizing the passing or failing of the simulated fatigue test site, the fatigue analysis method further comprises:
and if a signal representing that the simulated fatigue test part is unqualified is output, modifying the structural parameters and the weld joint characteristic information of the current simulated arm support to obtain a new simulated arm support, and performing fatigue analysis on the new simulated arm support.
According to another aspect of the present application, there is provided a fatigue analyzing apparatus including:
the first acquisition module is configured to acquire load data of the simulation arm support in different postures within a preset time;
the analysis module is configured to obtain a plurality of finite element quasi-static analysis results by taking different time nodes and the load data corresponding to the different time nodes as boundary conditions of finite element analysis;
the merging module is configured to merge the finite element quasi-static analysis results according to the time sequence to obtain a finite element dynamic analysis result;
and the first output module is configured to obtain a fatigue analysis result of the simulated arm support according to the finite element dynamic analysis result.
According to another aspect of the present application, there is provided a computer-readable storage medium storing a computer program for executing the aforementioned fatigue analysis method.
The fatigue analysis method, the fatigue analysis device and the computer readable storage medium provided by the application disperse continuous load data according to a time domain, take different time nodes and corresponding load data as boundary conditions of finite element analysis to obtain a plurality of finite element quasi-static analysis results, then combine the plurality of finite element quasi-static analysis results according to time sequence to obtain finite element dynamic analysis results of a plurality of postures in the continuous time domain, and then obtain fatigue analysis results of a simulated arm frame according to the finite element dynamic analysis results.
Drawings
The above and other objects, features and advantages of the present application will become more apparent by describing in more detail embodiments of the present application with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings, like reference numbers generally represent like parts or steps.
Fig. 1 is a schematic flow chart of a fatigue analysis method according to an exemplary embodiment of the present application.
Fig. 2 is a schematic flow chart of a fatigue analysis method according to another exemplary embodiment of the present application.
Fig. 3 is a schematic flow chart illustrating a process of obtaining a fatigue analysis result of the simulated boom according to a finite element dynamic analysis result according to an exemplary embodiment of the present application.
Fig. 4 is a schematic flow chart illustrating a fatigue analysis result of a simulated boom according to a finite element dynamic analysis result according to another exemplary embodiment of the present application.
Fig. 5 is a schematic flow chart illustrating a process of obtaining a fatigue analysis result of the simulated boom according to a finite element dynamic analysis result according to another exemplary embodiment of the present application.
Fig. 6 is a schematic flowchart of a fatigue analysis method according to another exemplary embodiment of the present application.
Fig. 7 is a schematic flowchart of a fatigue analysis method according to another exemplary embodiment of the present application.
Fig. 8 is a schematic flowchart of a fatigue analysis method according to another exemplary embodiment of the present application.
Fig. 9 is a block diagram of a fatigue analysis apparatus according to an exemplary embodiment of the present application.
Fig. 10 is a block diagram of a fatigue analysis apparatus according to another exemplary embodiment of the present application.
Fig. 11 is a block diagram of an electronic device according to an exemplary embodiment of the present application.
Detailed Description
Hereinafter, example embodiments according to the present application will be described in detail with reference to the accompanying drawings. It should be understood that the described embodiments are only some embodiments of the present application and not all embodiments of the present application, and that the present application is not limited by the example embodiments described herein.
Fig. 1 is a schematic flow chart of a fatigue analysis method according to an exemplary embodiment of the present application. As shown in fig. 1, a fatigue analysis method provided in an embodiment of the present application may include:
s210: and acquiring load data of the simulated arm support in different postures within a preset time.
In an embodiment, in the process of simulation, loads and constraints can be applied to different parts of the simulation arm support, and the simulation arm support can be controlled to realize changes of different postures, so that load data of the simulation arm support under different postures can be obtained.
In an embodiment, taking a forklift as an example, the simulation arm frame may include a first joint arm, a second joint arm and a third joint arm, the first joint arm is rotatably connected to the machine body, the second joint arm is telescopically connected to the first joint arm, the third joint arm is telescopically connected to the second joint arm, and a fork cutter is disposed at an end of the third joint arm. The first oil cylinder can drive the first knuckle arm to rotate relative to the machine body, the second oil cylinder can drive the second knuckle arm to move relative to the first knuckle arm in a telescopic mode, the chain system drives the third knuckle arm to move relative to the second knuckle arm in a telescopic mode, and the third oil cylinder and the fourth oil cylinder can be used for adjusting the angle of the fork knife.
Correspondingly, in an embodiment, the load data can include load data characterizing the fork blade, output force characterizing the first ram, output force characterizing the second ram, output force characterizing the third ram, and output force characterizing the fourth ram.
In one embodiment, a third link arm and corresponding chain system may be added as desired.
In an embodiment, the simulating the posture of the boom may include simulating the posture of the boom at an angle with a horizontal plane under different conditions.
In an embodiment, simulating the pose of the boom may include simulating the pose of the boom at different lengths.
S220: and taking the nodes at different times and the load data corresponding to the nodes at different times as boundary conditions of the finite element analysis to obtain a plurality of finite element static quasi-analysis results.
In an embodiment, the load data of the simulation jib continuously changes along with the change of time under different postures, and part of time nodes and corresponding load data can be used as boundary conditions of finite element analysis to be input into a finite element quasi-static analysis model for quasi-static analysis, so that a plurality of finite element quasi-static analysis results are obtained.
In one embodiment, the finite element analysis model is a model created by using a finite element analysis method, and the specific modeling process is described in the related art.
It should be understood that, compared with the method of directly performing conventional finite element dynamic analysis or rigid-flexible coupling, the finite element quasi-static analysis has lower convergence difficulty and shorter convergence calculation time, and can effectively improve the analysis efficiency.
S230: and combining the finite element quasi-static analysis results according to the time sequence to obtain a finite element dynamic analysis result.
In an embodiment, the finite element quasi-static analysis results in the plurality of postures can be merged according to the time sequence, so that the finite element dynamic analysis results in the plurality of postures in the continuous time domain can be obtained. That is, after step S230 is executed, the finite element dynamic analysis result of the boom can be obtained by combining the plurality of finite element quasi-static analysis results without using a conventional finite element dynamic analysis method, and the problems of high convergence difficulty and long convergence time of conventional finite element dynamic analysis or rigid-flexible coupling analysis and other methods are solved.
In an embodiment, the finite dynamic analysis result may include a stress, a node force, and a strain deformation condition of each part of the simulated boom model. The stress and the node force of each part can be used for subsequent calculation to obtain a fatigue analysis result.
S240: and obtaining a fatigue analysis result of the simulated arm frame according to the finite element dynamic analysis result.
In an embodiment, the finite element dynamic analysis result of the simulation boom is input into the fatigue analysis model, and the fatigue analysis result of the simulation boom can be correspondingly output. Moreover, in practical application, a stress analysis result of the arm support can be obtained, and the stress condition of the arm support can be better known.
In an embodiment, in the process of inputting the finite element dynamic analysis result into the fatigue analysis model, the fatigue analysis model may further output the fatigue analysis result of the simulation boom by combining with the weld joint characteristic information of the simulation boom. The weld characteristic information may include the location of the weld, the size of the weld, the type of weld, and the like.
In an embodiment, the fatigue analysis result of the simulation arm support may include fatigue life of each part of the simulation arm support. The fatigue analysis method provided by the application is characterized in that continuous load data are dispersed according to a time domain, different time nodes and corresponding load data are used as boundary conditions of finite element analysis, a plurality of finite element quasi-static analysis results are obtained, then the finite element quasi-static analysis results are combined according to time sequence, finite element dynamic analysis results of a plurality of postures in a continuous time domain are obtained, and then fatigue analysis results of a simulated arm frame are obtained according to the finite element dynamic analysis results.
On the other hand, the finite element dynamic analysis results of a plurality of postures are obtained by combining a plurality of finite element quasi-static analysis results, the problems of difficulty in modeling and low analysis precision of nonlinear problems in conventional finite element dynamic analysis or rigid-flexible coupling methods and the like are effectively solved, the precision of the finite element dynamic analysis results is improved, and the precision of the fatigue analysis results of the simulated boom can be effectively improved.
Fig. 2 is a schematic flow chart of a fatigue analysis method according to another exemplary embodiment of the present application. As shown in fig. 2, in an embodiment, after step S210, the fatigue analysis method may further include:
s250: and forming a load spectrum corresponding to the preset duration according to the load data of the simulated arm support in the preset duration.
In an embodiment, the load spectrum may include a plurality of load curves, and different load curves may characterize load variations at different attitudes.
S260: and selecting different time nodes and load data corresponding to the different time nodes according to the load spectrum.
In one embodiment, after a load spectrum corresponding to a preset duration is formed, multipoint dispersion is performed on the load spectrum according to a time domain, and different time nodes and corresponding load data are obtained. It should be understood that the load data corresponding to different time nodes may correspond to the load data of the simulation arm support in different postures.
In an embodiment, the system may select different time nodes and corresponding load data according to a preset program.
Correspondingly, step S220 may include:
s221: and taking the selected different time nodes and the load data corresponding to the different time nodes as boundary conditions of the finite element analysis to obtain a plurality of finite element quasi-static analysis results.
In an embodiment, different time nodes selected on the load spectrum and corresponding load data are input into corresponding finite element quasi-static analysis models, and a plurality of finite element quasi-static analysis results can be obtained.
In one embodiment, after a plurality of load data are input into the quasi-static analysis model, the output quasi-static analysis result comprises data of deformation, stress, node force and the like of a loading process with the load from 0% to 100%.
In one embodiment, the finite element results to be used for the merging are only deformation, stress, nodal force, etc. data when the load value is loaded by 100%. In practical application, according to the time sequence of different time nodes, sequentially combining the deformation, stress, node force and other numbers obtained when the different time nodes and corresponding load data are completely loaded, thereby obtaining a finite element dynamic analysis result containing time information.
Fig. 3 is a schematic flow chart illustrating a process of obtaining a fatigue analysis result of the simulated boom according to a finite element dynamic analysis result according to an exemplary embodiment of the present application. As shown in fig. 3, step S240 may include:
s241: and acquiring an actual stress detection result of the entity stress test part after the stress test.
In an embodiment, the solid boom may include a solid stress testing portion, and in practical application, the solid stress testing portion may be subjected to a stress test, so as to obtain an actual stress detection result of the solid stress testing portion after the stress test.
In one embodiment, a stress detection device may be installed at the physical stress test site, for example: a strain gauge; the stress detection device can detect the stress condition of the physical stress test part in the process that the physical arm support changes different postures.
In one embodiment, the number of the physical stress testing sites may be one or more.
In one embodiment, the actual stress detection results of different physical stress test sites may correspond to different stress curves.
S242: and if the benchmarking precision indexes of the finite element dynamic analysis result of the simulated stress test part and the actual stress detection result of the entity stress test part are within a first preset range, obtaining the fatigue analysis result of the simulated arm support according to the finite element dynamic analysis result of the simulated arm support.
In an embodiment, the finite element dynamic analysis result of the simulated stress testing portion and the actual stress detection result of the physical stress testing portion may represent different stress curves, that is, the benchmarking accuracy index of the finite element dynamic analysis result of the simulated stress testing portion and the actual stress detection result of the physical stress testing portion may be obtained by calculating the benchmarking accuracy indexes of two corresponding stress curves.
In an embodiment, if the alignment precision index of the finite element dynamic analysis result of the simulated stress testing portion and the actual stress detection result of the physical stress testing portion is within the first preset range, the precision of the finite element dynamic analysis result of the simulated stress testing portion can be considered to meet the requirement. After the precision inspection is finished, the finite element dynamic analysis results of other parts of the simulation arm support can be considered to meet the precision requirement. Therefore, the finite element dynamic analysis result of the simulation arm support can be input into the fatigue model, and the fatigue analysis result of the simulation arm support can be obtained more accurately.
It should be understood that the greater the number of the physical stress testing portions, the greater the number of the simulated stress testing portions corresponding to the physical stress testing portions, the greater the number of the benchmarking precision index samples after comparison, and the more reliable the precision data of the finite element dynamic analysis result of the simulated boom.
Fig. 4 is a schematic flow chart illustrating a process of obtaining a fatigue analysis result of the simulated boom according to a finite element dynamic analysis result according to another exemplary embodiment of the present application. As shown in fig. 4, in an embodiment, after step S241, step S240 further includes:
s243: and comparing the finite element dynamic analysis result of the simulated stress test part with the actual stress detection result of the entity stress test part to obtain the error between the finite element dynamic analysis result of the simulated stress test part and the actual stress detection result of the entity stress test part.
In one embodiment, the errors may include a maximum error, a mean error, a goodness of fit error, and a normalized root mean square error.
In an embodiment, the error between the finite element dynamic analysis result of the simulated stress test part and the actual stress detection result of the physical stress test part can be calculated by different calculation methods. For example, a maximum error calculation method, an average error calculation method, a goodness-of-fit calculation method, and a normalized root mean square error calculation method may be included to calculate the error between the stress area of the actual test point and the stress area curve of the simulated test point.
S244: and according to the error, obtaining the benchmarking precision indexes of the finite element dynamic analysis result of the simulated stress testing part and the actual stress detection result of the entity stress testing part.
In an embodiment, the calibration accuracy index of the dynamic finite element analysis result and the actual stress detection result may be calculated according to one of the maximum error, the average error, the goodness-of-fit error, and the normalized root-mean-square error.
In an embodiment, the calibration accuracy index of the dynamic finite element analysis result and the actual stress detection result may be calculated according to two of the maximum error, the average error, the goodness-of-fit error, and the normalized root-mean-square error.
In an embodiment, the calibration accuracy index of the dynamic finite element analysis result and the actual stress detection result may be calculated according to three of the maximum error, the average error, the goodness-of-fit error, and the normalized root-mean-square error.
In an embodiment, the calibration accuracy index of the finite element dynamic analysis result and the actual stress detection result may be calculated according to the maximum error, the average error, the goodness-of-fit error, and the normalized root-mean-square error.
Fig. 5 is a schematic flow chart illustrating a process of obtaining a fatigue analysis result of the simulated boom according to a finite element dynamic analysis result according to another exemplary embodiment of the present application. As shown in fig. 5, in an embodiment, after step S241, step S240 further includes:
s245: and if the benchmarking accuracy index of the finite element dynamic analysis result of the simulated stress testing part and the actual stress detection result of the entity stress testing part is not in the first preset range, correcting the finite element analysis model of the simulated arm support so that the benchmarking accuracy index of the finite element dynamic analysis result of the simulated stress testing part and the actual stress detection result of the entity stress testing part after correction is in the first preset range.
In an embodiment, if the benchmarking precision index of the finite element dynamic analysis result of the simulated stress testing part and the actual stress detection result of the physical stress testing part is not within the first preset range, the precision of the finite element dynamic analysis result representing the simulated stress testing part is low, that is, the precision of the dynamic analysis result of the finite element of the whole simulated boom is low, and if the finite element dynamic analysis result of the simulated boom with low precision is directly used, the accuracy of the fatigue analysis result of the simulated boom is poor, so that the finite element analysis model of the simulated boom needs to be modified to obtain the finite element dynamic analysis result of the simulated boom with high precision.
In an embodiment, the finite element quasi-static analysis result of the simulation arm support can be modified by adjusting elements such as load conditions, constraint conditions and grid division in the finite element analysis of the simulation arm support, so that a finite element analysis model of the simulation arm support is modified, and finally, the calibration precision indexes of the finite element dynamic analysis result of the simulation stress test part and the actual stress detection result of the entity stress test part are in a first preset range.
S246: and obtaining a fatigue analysis result of the simulated arm support according to the corrected finite element dynamic analysis result of the simulated arm support.
It should be understood that after the finite element analysis model of the simulated boom is modified, the precision of the obtained finite element dynamic analysis result of the simulated boom is correspondingly improved, so that the precision requirement can be met, and according to the modified finite element dynamic analysis result of the simulated boom, the accuracy of the obtained fatigue analysis result of the simulated boom is higher.
In an embodiment, after obtaining the modified finite element dynamic analysis result of the simulated arm support, the fatigue analysis result of the simulated arm support can be output by combining the modified weld joint characteristic information of the simulated arm support. The weld characteristic information may include the location of the weld, the size of the weld, the type of weld, and the like.
Fig. 6 is a schematic flowchart of a fatigue analysis method according to another exemplary embodiment of the present application. As shown in fig. 6, in an embodiment, after step S240, the fatigue analysis method may further include:
s270: and acquiring an actual fatigue result of the entity fatigue test part after the fatigue test.
In an embodiment, the solid boom may include a solid fatigue testing portion and a non-fatigue testing portion, generally, after the solid fatigue testing portion is subjected to a fatigue test, a fracture condition may occur, and then the actual fatigue life of the solid fatigue testing portion, that is, the actual fatigue result of the solid fatigue testing portion may be obtained.
In one embodiment, by arranging the related sensors on the solid arm support, the position and posture information, the cylinder force and other load information and stress information of the solid arm support in the position and posture change can be acquired.
In an embodiment, the simulation arm frame may include a simulation fatigue test portion, and the simulation fatigue test portion corresponds to the physical fatigue test portion. It should be understood that, by comparing the fatigue analysis result of the simulated fatigue test portion with the actual fatigue result of the physical fatigue test portion, an error between the fatigue analysis result of the simulated fatigue test portion and the actual fatigue result of the physical fatigue test portion is obtained, so as to determine whether the precision of the fatigue analysis result of the simulated fatigue test portion is required according to the error.
In an embodiment, the more the number of the physical fatigue testing parts is, the more the number of the simulated fatigue testing parts corresponding to the physical fatigue testing parts is, the more the error samples are compared with each other, and the more reliable the precision data of the fatigue analysis result of the simulated boom is obtained.
S280: and if the error between the actual fatigue result of the entity fatigue test part and the fatigue analysis result of the simulated fatigue test part is within a second preset range, comparing the fatigue analysis result of the simulated fatigue test part with the required service life of the entity fatigue test part, and outputting a signal for representing whether the simulated fatigue test part is qualified or unqualified according to the comparison result.
In an embodiment, if an error between the actual fatigue result of the physical fatigue test portion and the fatigue analysis result of the simulated fatigue test portion is within a second preset range, the accuracy requirement may be considered to be met with the fatigue analysis result of the simulated fatigue test portion, and then the minimum value of the actual fatigue result of the physical fatigue test portion and the fatigue analysis result of the simulated fatigue test portion may be selected to be compared with the required life of the physical fatigue test portion.
In one embodiment, if the minimum of the actual fatigue result of the physical fatigue test part and the fatigue analysis result of the simulated fatigue test part is less than the required life of the physical fatigue test part, that is, the life requirement cannot be met, the system outputs a signal indicating that the simulated fatigue test part is not qualified. After receiving the unqualified signal, the worker can optimally design the structure of the simulation arm support, and then execute the steps to obtain the fatigue analysis result of the simulation fatigue test part again.
In one embodiment, if the minimum value between the actual fatigue result of the physical fatigue test part and the fatigue analysis result of the simulated fatigue test part is greater than or equal to the required life of the physical fatigue test part, a signal representing that the simulated fatigue test part is qualified can be correspondingly output.
Fig. 7 is a schematic flowchart of a fatigue analysis method according to another exemplary embodiment of the present application. As shown in fig. 7, in an embodiment, after step S270, the fatigue analysis method may further include:
s300: and if the error between the actual fatigue result of the entity fatigue test part and the fatigue analysis result of the simulated fatigue test part is not in a second preset range, correcting the fatigue analysis model of the simulated arm support so as to enable the error between the fatigue analysis result of the simulated fatigue test part and the actual fatigue result of the entity fatigue test part to be in the second preset range.
In an embodiment, if an error between an actual fatigue result of the physical fatigue test part and a fatigue analysis result of the simulated fatigue test part is not within a second preset range, the precision of the fatigue analysis result representing the simulated fatigue test part is low, that is, the precision of the fatigue analysis result of the whole simulated boom is low, and it is necessary to correct the fatigue analysis result of the simulated boom with low precision.
In an embodiment, when the precision of the finite element analysis model of the simulation arm support meets the requirement and the fatigue analysis result of the simulation arm support does not meet the precision requirement, the fatigue analysis model of the simulation arm support can be modified by adjusting parameters such as a material SN curve or an EN curve, surface condition influence parameters, weld joint characteristic parameters and the like in the fatigue model, so that the error between the actual fatigue result of the physical fatigue test part and the fatigue analysis result of the simulation fatigue test part is in a second preset range.
Fig. 8 is a schematic flowchart of a fatigue analysis method according to another exemplary embodiment of the present application. As shown in fig. 8, in an embodiment, after step S280, the fatigue analysis method may further include:
s310: and if a signal representing that the simulated fatigue test part is unqualified is output, modifying the structural parameters and the weld joint characteristic information of the current simulated arm support to obtain a new simulated arm support, and performing fatigue analysis on the new simulated arm support.
In an embodiment, if a signal representing that the simulated fatigue testing part is unqualified is output, it indicates that the fatigue life obtained by testing the simulated fatigue testing part does not meet the actual working requirement, so that the structure of the simulated boom needs to be optimized.
In an embodiment, the structural parameters of the simulated boom may include the length, the cross-sectional shape and the size of the simulated boom.
In an embodiment, the weld characteristic information of the simulation boom may include a position of the weld, a size of the weld, a type of the weld, and the like.
In an embodiment, after modifying the structural parameters and the weld joint characteristic signals of the current simulated boom, a new simulated boom can be obtained, and then the fatigue analysis can be performed on the new simulated boom to obtain a new fatigue analysis result. If necessary, a new solid arm support can be introduced for carrying out fatigue test. In practical application, if the simulated fatigue test part of the simulated boom fails for multiple times, the optimized design can be correspondingly performed for multiple times until the fatigue analysis result of the simulated fatigue test part of the simulated boom meets the working requirement.
Fig. 9 is a block diagram of a fatigue analysis apparatus according to an exemplary embodiment of the present application. As shown in fig. 9, the fatigue analysis apparatus 400 provided by the present application may include a first obtaining module 410 configured to obtain load data of the simulated boom in different postures within a preset time period; the analysis module 420 is configured to obtain a plurality of finite element quasi-static analysis results by using the different time nodes and the load data corresponding to the different time nodes as boundary conditions of the finite element analysis; a merging module 430 configured to merge the plurality of finite element quasi-static analysis results according to a time sequence to obtain a finite element dynamic analysis result; the first output module 440 is configured to obtain a fatigue analysis result of the simulated boom according to the finite element dynamic analysis result.
The fatigue analysis device provided by the application disperses continuous load data according to a time domain, obtains a plurality of finite element quasi-static analysis results by taking different time nodes and corresponding load data as boundary conditions of finite element analysis, then combines the finite element quasi-static analysis results according to time sequence to obtain finite element dynamic analysis results of a plurality of postures in a continuous time domain, and then obtains a fatigue analysis result of a simulated cantilever crane according to the finite element dynamic analysis results.
Fig. 10 is a block diagram of a fatigue analysis apparatus according to another exemplary embodiment of the present application. As shown in fig. 10, in an embodiment, the fatigue analysis apparatus 400 may further include a forming module 450, configured to form a load spectrum corresponding to a preset duration according to load data of the simulated boom within the preset duration; a selecting module 460 configured to select different time nodes and load data corresponding to the different time nodes according to the load spectrum; correspondingly, the analysis module 420 may be further configured to obtain a plurality of finite element quasi-static analysis results by using the selected different time nodes and the load data corresponding to the different time nodes as boundary conditions of the finite element analysis.
As shown in fig. 10, in an embodiment, the first output module 440 may include a second obtaining module 441 configured to obtain an actual stress detection result of the physical stress testing portion after the stress test; the second output module 442 is configured to obtain a fatigue analysis result of the simulated boom according to the finite element analysis model of the simulated boom if the benchmarking accuracy index of the finite element dynamic analysis result of the simulated stress test portion and the actual stress detection result of the physical stress test portion is within the first preset range.
As shown in fig. 10, in an embodiment, the first output module 440 may include a first modification module 443 configured to modify the finite element analysis model of the simulated boom if the benchmarking accuracy indicators of the finite element dynamic analysis result of the simulated stress testing portion and the actual stress detection result of the physical stress testing portion are not within the first preset range, so that the revised benchmarking accuracy indicators of the finite element dynamic analysis result of the simulated stress testing portion and the actual stress detection result of the physical stress testing portion are within the first preset range; and the third output module 444 is configured to obtain a fatigue analysis result of the simulated boom according to the modified finite element analysis model of the simulated boom.
As shown in fig. 10, in an embodiment, the first output module 440 may include a comparison module 445 configured to compare the dynamic finite element analysis result of the simulated stress test portion with the actual stress detection result of the physical stress test portion to obtain an error between the dynamic finite element analysis result of the simulated stress test portion and the actual stress detection result of the physical stress test portion; wherein the errors include a maximum error, a mean error, a goodness-of-fit error, and a normalized root mean square error; the fourth output module 446 is configured to obtain the alignment precision index of the finite element dynamic analysis result of the simulated stress test portion and the actual stress detection result of the physical stress test portion according to the error.
As shown in fig. 10, in an embodiment, the fatigue analysis apparatus 400 may further include a third obtaining module 470 configured to obtain an actual fatigue result of the physical fatigue test site after the fatigue test; the fifth output module 480 is configured to compare the fatigue analysis result of the simulated fatigue test portion with the required life of the physical fatigue test portion if an error between the actual fatigue result of the physical fatigue test portion and the fatigue analysis result of the simulated fatigue test portion is within a second preset range, and output a signal indicating that the simulated fatigue test portion is qualified or unqualified according to the comparison result.
As shown in fig. 10, in an embodiment, the fatigue analysis apparatus 400 may further include a second correction module 500 configured to correct the fatigue analysis model of the simulation boom if an error between the actual fatigue result of the physical fatigue test site and the fatigue analysis result of the simulated fatigue test site is not within a second preset range, so that the error between the fatigue analysis result of the simulated fatigue test site and the actual fatigue result of the physical fatigue test site is within the second preset range.
As shown in fig. 10, in an embodiment, the fatigue analysis apparatus 400 may further include a third modification module 510, configured to modify the structural parameters and the weld joint characteristic information of the current simulated boom to obtain a new simulated boom and perform fatigue analysis on the new simulated boom if a signal indicating that the simulated fatigue test portion is not qualified is output.
Fig. 11 is a block diagram of an electronic device according to an exemplary embodiment of the present application.
Next, an electronic device 10 according to an embodiment of the present application is described with reference to fig. 11. The electronic device 10 may be a stand-alone device independent of, or either one or both of the first device and the second device that may communicate with the first device and the second device to receive the collected input signals therefrom.
As shown in fig. 11, the electronic device 10 includes one or more processors 11 and memory 12.
The processor 11 may be a Central Processing Unit (CPU) or other form of processing unit having data processing capabilities and/or instruction execution capabilities, and may control other components in the electronic device 10 to perform desired functions.
Memory 12 may include one or more computer program products that may include various forms of computer-readable storage media, such as volatile memory and/or non-volatile memory. Volatile memory can include, for example, Random Access Memory (RAM), cache memory (or the like). The non-volatile memory may include, for example, Read Only Memory (ROM), a hard disk, flash memory, and the like. One or more computer program instructions may be stored on a computer readable storage medium and executed by processor 11 to implement the methods of the various embodiments of the present application described above and/or other desired functionality. Various contents such as an input signal, a signal component, a noise component, etc. may also be stored in the computer-readable storage medium.
In one example, the electronic device 10 may further include: an input device 13 and an output device 14, which are interconnected by a bus system and/or other form of connection mechanism (not shown).
When the electronic device is a stand-alone device, the input means 13 may be a communication network connector for receiving the acquired input signals from the first device and the second device.
The input device 13 may also include, for example, a keyboard, a mouse, and the like.
The output device 14 may output various information including the determined distance information, direction information, and the like to the outside. The output devices 14 may include, for example, a display, speakers, a printer, and a communication network and its connected remote output devices, among others.
Of course, for the sake of simplicity, only some of the components of the electronic device 10 relevant to the present application are shown in fig. 11, and components such as buses, input/output interfaces, and the like are omitted. In addition, the electronic device 10 may include any other suitable components depending on the particular application.
The computer program product may include program code for carrying out operations for embodiments of the present application in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server.
The computer-readable storage medium may take any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may include, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The foregoing description has been presented for purposes of illustration and description. Furthermore, the description is not intended to limit embodiments of the application to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.
Claims (10)
1. A method of fatigue analysis, comprising:
acquiring load data of the simulation arm support in different postures within a preset time;
taking the different time nodes and the load data corresponding to the different time nodes as boundary conditions of finite element analysis to obtain a plurality of finite element quasi-static analysis results;
merging the finite element quasi-static analysis results according to the time sequence to obtain a finite element dynamic analysis result; and
and obtaining a fatigue analysis result of the simulated arm support according to the finite element dynamic analysis result.
2. The fatigue analysis method according to claim 1, wherein after the obtaining load data of the simulation boom in different postures within a preset time period, the fatigue analysis method further comprises:
forming a load spectrum corresponding to the preset duration according to the load data of the simulation arm frame within the preset duration;
selecting different time nodes and the load data corresponding to the different time nodes according to the load spectrum;
the obtaining of a plurality of finite element quasi-static analysis results by using different time nodes and the load data corresponding to the different time nodes as boundary conditions of finite element analysis comprises:
and taking the selected different time nodes and the load data corresponding to the different time nodes as boundary conditions of finite element analysis to obtain a plurality of finite element quasi-static analysis results.
3. The fatigue analysis method according to claim 1, wherein the solid arm support comprises a solid stress test part, and the solid stress test part is provided with a stress detection device; the simulation arm support comprises a simulation stress test part corresponding to the entity stress test part;
the obtaining of the fatigue analysis result of the simulated arm support according to the finite element dynamic analysis result comprises:
acquiring an actual stress detection result of the entity stress test part after a stress test;
and if the benchmarking precision indexes of the finite element dynamic analysis result of the simulated stress test part and the actual stress detection result of the entity stress test part are within a first preset range, obtaining the fatigue analysis result of the simulated arm support according to the finite element dynamic analysis result of the simulated arm support.
4. The fatigue analysis method according to claim 3, wherein after obtaining the actual stress detection result of the physical stress test part after the stress test, obtaining the fatigue analysis result of the simulation arm support according to the finite element dynamic analysis result comprises:
if the benchmarking accuracy index of the finite element dynamic analysis result of the simulated stress testing part and the actual stress detection result of the entity stress testing part is not in the first preset range, correcting the finite element analysis model of the simulated arm support so that the benchmarking accuracy index of the corrected finite element dynamic analysis result of the simulated stress testing part and the actual stress detection result of the entity stress testing part is in the first preset range; and
and obtaining a fatigue analysis result of the simulation arm support according to the corrected finite element dynamic analysis result of the simulation arm support.
5. The fatigue analysis method according to claim 3, wherein after obtaining the actual stress detection result of the physical stress test part after the stress test, obtaining the fatigue analysis result of the simulated boom according to the finite element dynamic analysis result further comprises:
comparing the finite element dynamic analysis result of the simulated stress test part with the actual stress detection result of the entity stress test part to obtain the error between the finite element dynamic analysis result of the simulated stress test part and the actual stress detection result of the entity stress test part; wherein the errors include a maximum error, a mean error, a goodness-of-fit error, and a normalized root mean square error;
and according to the error, obtaining the benchmarking precision indexes of the finite element dynamic analysis result of the simulated stress testing part and the actual stress detection result of the entity stress testing part.
6. The fatigue analysis method of claim 1, wherein the physical arm support comprises a physical fatigue test site; the simulation arm support comprises a simulation fatigue test part; wherein the simulated fatigue test site corresponds to the physical fatigue test site;
after the fatigue analysis result of the simulation arm support is obtained, the fatigue analysis method further includes:
acquiring an actual fatigue result of the entity fatigue test part after a fatigue test;
and if the error between the actual fatigue result of the entity fatigue test part and the fatigue analysis result of the simulation fatigue test part is within a second preset range, comparing the fatigue analysis result of the simulation fatigue test part with the required service life of the entity fatigue test part, and outputting a signal representing whether the simulation fatigue test part is qualified or unqualified according to the comparison result.
7. The fatigue analysis method according to claim 6, wherein after the obtaining of the actual fatigue result of the simulated boom after the fatigue test, the fatigue analysis method further comprises:
and if the error between the actual fatigue result of the entity fatigue test part and the fatigue analysis result of the simulated fatigue test part is not in a second preset range, correcting the fatigue analysis model of the simulated boom so as to enable the error between the fatigue analysis result of the simulated fatigue test part and the actual fatigue result of the entity fatigue test part to be in the second preset range.
8. The fatigue analysis method of claim 6, wherein after the outputting the signal indicative of the simulated fatigue test site passing or failing, the fatigue analysis method further comprises:
and if a signal representing that the simulated fatigue test part is unqualified is output, modifying the structural parameters and the weld joint characteristic information of the current simulated arm support to obtain a new simulated arm support, and performing fatigue analysis on the new simulated arm support.
9. A fatigue analysis device, comprising:
the first acquisition module is configured to acquire load data of the simulation arm support in different postures within a preset time;
the analysis module is configured to obtain a plurality of finite element quasi-static analysis results by taking different time nodes and the load data corresponding to the different time nodes as boundary conditions of finite element analysis;
the merging module is configured to merge the finite element quasi-static analysis results according to the time sequence to obtain a finite element dynamic analysis result;
and the first output module is configured to obtain a fatigue analysis result of the simulated arm support according to the finite element dynamic analysis result.
10. A computer-readable storage medium, characterized in that the storage medium stores a computer program for executing the fatigue analysis method according to any one of claims 1 to 8.
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