KR101977099B1 - Method of Durability Analysis for Danamic Load - Google Patents

Abstract

According to the present invention, a durability analysis method using a dynamic load comprises: a system model construction step of constructing an entire multi-body system in a multi-body dynamics model based on a rigid body; a rigidity analysis target designating step of designating a rigidity analysis target body requiring rigidity analysis among bodies of the multi-body system; a rigidity analysis step of analyzing rigidity of the rigidity analysis target body; a rigidity compensation modeling step of replacing the rigidity analysis target body of the multi-body dynamics model with a rigidity compensation model incorporating the rigidity analysis in the rigidity analysis step; a load calculation step of calculating a load result in time of a connection component portion of the multi-body dynamics model to which the rigidity compensation model is applied; a durability analysis target designating step of designating a durability analysis target body in the multi-body dynamics model; and a durability analysis step of performing durability analysis of the durability analysis target body based on the load result. Durability analysis incorporating a dynamic load applied to a body can be performed by a single integrated process.

Description

TECHNICAL FIELD [0001] The present invention relates to a durability analysis method,

The method for durability analysis using dynamic loads according to the present invention includes a system model constructing step of constructing a multi-object system as a rigid body-based multi-body dynamics model, A stiffness analysis step of designating an object to be analyzed, a stiffness analysis step of analyzing the stiffness of the object to be stiffness-analyzed, a stiffness analysis step of stiffness analysis of the stiffness analysis object of the multi- A load calculating step of calculating load results with time of connection parts of the multibody kinetic model to which the stiffness compensation model is applied; and a load calculating step of calculating a load calculation result of the multibody kinematic model, An endurance analysis target designation step of designating an endurance analysis target of the endurance analysis object based on the result of the load; And an endurance analysis reflecting the dynamic load applied to the object including the endurance analysis step can be performed through one integrated process.

Structural analysis is a mathematical modeling and analysis of physical phenomena such as strength, deformation, vibration, noise and temperature distribution of aircraft structures, automobiles, and industrial machinery. If the object to be analyzed becomes complicated, even if it is built up for each problem, the finite element method and the boundary element method are developed to analyze the stress distribution and the temperature distribution in the machine because the general analysis can not be obtained. Numerical analysis using computer is commonly used, and finite element method (FEM) is most commonly used as numerical calculation method of structural analysis.

Among them, static structural analysis is a method mainly used for durability analysis of parts, and it analyzes the displacement, stress, tensile strain, and force of a structure or element to which a load is applied . In general, for a system with a complex structure, the largest load among the applied loads is applied to the system and static balance analysis is performed to evaluate the stress of the component. However, the method of selecting and analyzing one large load is difficult to calculate the input load, and the accuracy of the analysis is poor because it does not reflect the dynamic load which changes with time.

Due to these problems, recently, it is possible to analyze a multi-body dynamics analyzer and a structural analyzer interlockingly, or to analyze a single structural dynamics analyzer at a time, or to combine a rigid body-based multi- However, the following problems exist.

First, the method of using the existing MBD analyzer and structure analyzer interlocked is as follows. After constructing the whole system model based on the rigid body and performing the MBD analysis, the load and the fastening position information acting on the component to be analyzed are calculated, The structure analysis is applied again to a separate structure analyzer, and the process of passing the changed joint position due to the deformation of the component calculated by the structural analyzer to the MBD analyzer is repeated every time interval. However, the structural analyzer does not sufficiently reflect the change of the condition depending on the speed, the acceleration or the unit time. Therefore, there is a problem that when the influence of the speed or the acceleration is large, a proper result can not be obtained. In addition, the MBD model only contains information on the constraint condition of the part to be analyzed, which is problematic in accurately calculating rigidity as compared with the flexible body model. Further, even if the stiffness accuracy is compensated for by performing a separate stiffness analysis on the parts in which the stiffness is important, it has been difficult to individually perform each part.

Second, there is a method of interpreting the entire system at one time in one structural dynamics analyzer. This method can reflect the speed and acceleration in the time domain and obtain high accuracy results. However, this method has a problem in that the complexity of the system increases exponentially as the degree of freedom increases because the entire system is composed of a flexible body. Particularly, in the case of analysis considering the dynamic load, this problem becomes more severe because it goes through thousands to tens of times as compared with the conventional static structural analysis.

Third, there is a method to combine MBD and flexible bodies in one structural dynamics analyzer. In this method, only the parts to be durability analyzed are composed of flexible bodies, and the remaining parts are constituted of rigid bodies and analyzed by a single analyzer. However, MBD Model is used together to compensate for the inaccurate stiffness, and if the system is complicated, there is a disadvantage that the analysis time increases exponentially like the second method. Furthermore, there is a need to perform the entire system analysis again every time an object to be converted into a flexible object is changed.

Therefore, the effects of velocity and acceleration are reflected in the analysis results, and the analysis time can be efficiently utilized by dividing and calculating many degrees of freedom in a complex system, and a convenient analysis can be performed by automating the stiffness compensation process for accurate dynamic load history calculation , There is a need for an effective durability analysis process that can effectively calculate the dynamic load applied to a complex overall system model in a short time.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems,

It is an object of the present invention to automatically perform stiffness analysis, multibody dynamics analysis, and durability analysis for an endurance analysis of an object to which a dynamic load is applied through a single integrated process, thereby reducing analysis time and improving user convenience And to provide a durability analysis method using the dynamic load.

Another object of the present invention is to provide a stiffness analysis method and a durability analysis method that are independent of a multibody dynamics analysis and are independent of each other. And to provide an endurance analysis method using a dynamic load that can efficiently utilize the analysis time by analyzing the divided parts.

It is still another object of the present invention to provide a method for analyzing durability using dynamic loads, comprising: a system model constructing step of constructing a multi-object system as a rigid-body multi-body dynamics model; A stiffness analysis target designation step of designating a stiffness analysis object to be subjected to a stiffness analysis, a stiffness analysis step of analyzing a stiffness of the stiffness analysis object, a stiffness analysis step of analyzing the stiffness analysis object of the multibody dynamic model, A load calculating step of calculating load results with time of connection parts of a multibody dynamic model to which the stiffness compensation model is applied; A durability analysis object designation step of designating an object to be durability analysis based on the result of the load; And a durability analysis method using the dynamic load that can efficiently perform the durability analysis using the dynamic load reflecting the velocity / acceleration effect through one integrated process including the durability analysis step for performing the analysis.

It is still another object of the present invention to provide a method for durability analysis using the dynamic load, the method comprising: a dividing criterion setting step of setting a criterion for dividing the object to be analyzed before and after the stiffness analysis object specifying step; The object to be analyzed by stiffness analysis is freely divided according to the accuracy and the time of the required analysis and the user's intention and the durability using the dynamic load capable of flexible analysis And to provide an analysis method.

It is still another object of the present invention to provide a stiffness analyzing method including a stiffness direction setting step of setting a direction of stiffness to be obtained from an object to be stiffly analyzed, And a data extracting step of extracting displacement-load data of the object of stiffness analysis, thereby providing a durability analysis method using a dynamic load capable of deriving the exact stiffness of the object to be analyzed.

It is still another object of the present invention to provide a method of analyzing a stiffness of a vehicle, wherein the stiffness analysis step includes an independent model construction step of executing a separate analysis model environment after the stiffness direction setting step, It is possible to reduce the time required for system analysis by performing the rigidity analysis of the object in a separate environment in a separate environment, because it is performed independently in the multi-object dynamics model configuration environment and in the separate model configuration environment And to provide a durability analysis method using the dynamic load.

It is still another object of the present invention to provide a data processing method and a data processing method, wherein the independent model construction step, flexible body conversion step, and data extraction step are automatically performed based on modeling data of the system model construction step and data set in the stiffness direction setting step , And a durability analysis method using a dynamic load capable of simple and convenient analysis.

It is still another object of the present invention to provide a stiffness compensation modeling method, wherein the stiffness compensation modeling step includes: a split model replacing step of replacing a stiffness analysis object modeled on a rigid body basis in the system model construction step with an object to be analyzed, A coupling condition applying step of applying existing coupling conditions of the object of stiffness analysis in the system model forming step, an elastic model forming step of forming an elastic model in the divided object using the displacement-load data extracted in the data extracting step, And a model stiffness adjusting step of adjusting the stiffness data to perform rigid body motion in a direction in which there is no result of the stiffness analysis, thereby providing a durability analysis method using a dynamic load that does not require a separate process for compensating the rigidity accuracy.

It is still another object of the present invention to provide an elastic model forming step of composing or dividing the elasticity model by synthesizing or dividing the displacement-load data according to the number of divided parts of the object to be stiffness- The present invention provides an endurance analysis method using a dynamic load that can be flexibly analyzed according to the accuracy of analysis required, analysis time, and user's intention.

It is still another object of the present invention to provide a method and an apparatus for modeling a stiffness of an object to be analyzed, the method comprising: The present invention provides an endurance analysis method using a dynamic load that can reduce a time required for a user to input or operate a robot, reduce an error caused by a user's input, reduce an analysis time, and perform convenient analysis .

It is still another object of the present invention to provide a method and an apparatus for analyzing a load of an object based on a load inputted in the system model construction step, And an analysis result storage step for storing the analysis results, wherein the load analysis of the entire system is performed once or at a minimum, thereby providing a durability analysis method using dynamic loads that can greatly shorten the time required for system analysis.

It is still another object of the present invention to provide a load analysis method and a load analysis method, wherein the load calculation step is automatically performed based on the results of the system model configuration step, the analysis object designation step, and the stiffness compensation modeling step And to provide a durability analysis method using a dynamic load capable of reducing an input or operation time by a user, reducing an error caused by a user's input, reducing an analysis time, and enabling convenient analysis.

It is still another object of the present invention to provide a durability analysis method, wherein the durability analysis step includes a flexible body conversion step of configuring the durability analysis object designated by the durability analysis object designation step as a flexible body, And the durability analysis of the durability analysis object is performed based on the applied load, and the stress result is output to calculate the durability and fatigue And an endurance analysis step of evaluating the endurance of the object to be analyzed. The present invention provides an endurance analysis method using a dynamic load capable of performing accurate endurance analysis of an object to be analyzed.

It is still another object of the present invention to provide an endurance analysis method, wherein the endurance analysis step includes an independent model construction step for executing a separate analysis model environment before the flexible body transformation step, And a model construction environment independent of the model construction environment. The durability analysis based on a flexible body is performed on a part-by-part basis in a separate environment, thereby reducing the time required for system analysis. And to provide a method of endurance analysis using the method.

 It is still another object of the present invention to provide a method of analyzing a durability of a durability analysis system, wherein the durability analysis step includes the steps of: constructing the system model, specifying a stiffness analysis target, setting a division criterion, The method of the present invention is characterized in that it is performed automatically based on the result of the object designation step, and it is possible to reduce the input or the operation time by the user, reduce the error caused by the user's input, And to provide a durability analysis method using dynamic loads.

That is, according to the present invention, the load analysis of the entire system is performed once or at least as described above, and the load acting on the connecting portion of the component is extracted. Then, the durability analysis based on the flexible body is performed in a separate environment The time required for system analysis can be greatly shortened.

In order to achieve the above object, the present invention is implemented by the following embodiments.

According to an embodiment of the present invention, the present invention is characterized in that stiffness analysis, multibody dynamics analysis, and durability analysis for performing durability analysis of an object to which a dynamic load is applied can be automatically performed through one integrated process .

According to another embodiment of the present invention, the stiffness analysis and the endurance analysis process are performed in an independent configuration environment separate from the multibody dynamics analysis.

According to still another embodiment of the present invention, there is provided a method for constructing a multi-object dynamics model, the method comprising the steps of: constructing a multi-object dynamics model based on a rigid body; A stiffness analysis target designating step of designating a stiffness analysis object to be stiffed, a stiffness analysis step of analyzing a stiffness of the stiffness analysis object, a stiffness analysis step of stiffness analysis of the stiffness analysis object in the multibody dynamics model, A load calculation step of calculating a load result with time of a connection constituent part of a multibody dynamic model to which the stiffness compensation model is applied; A durability analysis object designation step of designating an object, and a durability analysis object designation step of designating an object for durability analysis of the durability analysis object based on the load result Characterized in that it comprises an analysis step.

According to still another embodiment of the present invention, the durability analysis method using the dynamic load includes a dividing criterion setting step of setting a criterion for dividing the object to be analyzed after the stiffness analysis object designation step, And an analyzing object dividing step of dividing the object to be analyzed based on the criterion.

According to another embodiment of the present invention, the durability analysis method using the dynamic load includes a dividing criterion setting step of setting a criterion for dividing the object to be analyzed after the stiffness analysis step, And an analyzing object dividing step of dividing the object to be analyzed on the basis of the analysis object dividing step.

According to another embodiment of the present invention, the stiffness analysis step includes a stiffness direction setting step of setting a direction of stiffness to be obtained from the stiffness analysis object, a step of converting the stiffness analysis object modeled as a rigid body into a flexible body And a data extracting step of extracting displacement-load data of the object to be stiffness-analyzed.

According to another embodiment of the present invention, the stiffness analysis step may include an independent model construction step of executing a separate analysis model environment after the stiffness direction setting step, And is independently performed in a multi-object dynamics model construction environment of the system model construction phase and in a separate model construction environment.

According to another embodiment of the present invention, the independent model construction step, the flexible member conversion step, and the data extraction step are automatically performed based on the modeling data of the system model construction step and the data set in the stiffness direction setting step .

According to another embodiment of the present invention, the stiffness compensation modeling step may include a step of replacing the stiffness analysis object modeled on the rigid-body basis in the system model construction step with a split model replacement A step of applying an engaging condition to apply an existing engaging condition of the object of stiffness analysis in the system model constituting step, an elastic model constituting an elastic model in the divided object using the displacement-load data extracted in the data extracting step And a model stiffness adjusting step of adjusting stiffness data so as to perform rigid body motion in a direction in which there is no result of the stiffness analysis.

According to another embodiment of the present invention, the elastic model forming step may include a step of dividing the elasticity model by synthesizing or dividing the displacement-load data according to the number of divided parts of the object to be stiffness- .

According to another embodiment of the present invention, the elastic model forming step is performed by changing the displacement-load data to a constant value.

According to another embodiment of the present invention, the stiffness compensation modeling step may include a step of calculating a stiffness of the object to be analyzed by using the information on the fastening configuration of the object to be analyzed in the system model construction step, Is automatically performed.

According to another embodiment of the present invention, the load calculation step may include: a load analysis step of analyzing loads of each object based on the loads inputted in the system model construction step; And an analysis result storing step of storing the load.

According to another embodiment of the present invention, the load calculation step is characterized in that the load analysis step and the analysis result storage step are automatically performed based on the results of the system model construction step, the analysis object designation step, and the stiffness compensation modeling step .

According to another embodiment of the present invention, the durability analysis step may include a flexible body conversion step of configuring the durability analysis object designated by the durability analysis object designation step as a flexible body, and a load calculation step of calculating, In the model construction step, the connection condition of the object to be analyzed is reflected to apply the load result applied to the object to be durably analyzed and the durability analysis of the object to be durability analyzed based on the applied load, And an endurance analysis performing step of evaluating fatigue endurance.

According to another embodiment of the present invention, the endurance analysis step includes an independent model construction step for executing a separate analysis model environment before the flexible body conversion step, wherein the endurance analysis step is performed in the system model construction step And is independently performed in a model configuration environment separate from the object dynamics model configuration environment.

The present invention can obtain the following effects by the above-described embodiment, the constitution described below, the combination, and the use relationship.

The present invention relates to a method and apparatus for automatically performing a rigid analysis, a multibody dynamics analysis, and an endurance analysis for an endurance analysis of an object to which a dynamic load is applied through a single integrated process, The present invention provides an endurance analysis method using the method.

The present invention is characterized in that the stiffness and durability analysis processes are performed in an independent configuration environment separate from the multibody dynamics analysis. Therefore, when the number of parts to be durably analyzed is large, the degree of freedom is not interpreted at once, And the durability analysis method using the dynamic load which can efficiently utilize the analysis time can be obtained.

According to the present invention, the durability analysis method using the dynamic load includes a system model constructing step of constructing a multi-object system as a rigid body-based multi-body dynamics model, and a stiffness analysis in the multi- A stiffness analysis target designating step of designating a stiffness analysis object to be stiffed, a stiffness analysis step of analyzing a stiffness of the stiffness analysis object, a stiffness analysis step of stiffness analysis of the stiffness analysis object in the multibody dynamics model, A load calculation step of calculating a load result with time of a connection constituent part of a multibody dynamic model to which the stiffness compensation model is applied; A durability analysis object designation step of designating an object, and a durability analysis step of performing the durability analysis of the durability analysis object based on the load result Durability, including the interpretation step, it is effective to provide a durable analysis method using the dynamic loads that can be carried out efficiently survival analysis using a dynamic load, which is reflected, the speed / acceleration effects through a single integrated process.

The present invention is characterized in that the dynamic analysis method using the dynamic load includes a dividing criterion setting step of setting a criterion for dividing the object to be analyzed before and after the stiffness analysis object designation step, Providing a durability analysis method using a dynamic load capable of flexible analysis by freely dividing the object to be subjected to stiffness analysis according to the accuracy and the time of the required analysis and the user's intention, including the object division step for dividing the object .

The present invention is characterized in that the stiffness analysis step includes a stiffness direction setting step of setting a direction of stiffness to be obtained from the stiffness analysis object, a flexible body conversion step of converting the stiffness analysis object modeled as a rigid body into a flexible body, And a data extracting step of extracting displacement-load data of the object of stiffness analysis, thereby deriving the effect of providing a durability analysis method using a dynamic load capable of deriving the exact rigidity of the object to be analyzed.

The present invention is characterized in that the stiffness analysis step includes an independent model construction step of executing a separate analysis model environment after the stiffness direction setting step, wherein the flexible body conversion step and the data extraction step are performed in the system model construction step The dynamic analysis of the object is carried out independently in the model construction environment and the dynamic analysis of the object is performed in the separate environment on a part basis to greatly reduce the time required for the system analysis. Thereby providing an endurance analysis method.

The present invention is characterized in that the independent model construction step, the flexible body conversion step and the data extraction step are performed automatically based on the modeling data of the system model construction step and the data set in the stiffness direction setting step. And the durability analysis method using the dynamic load that can be analyzed is provided.

The present invention is characterized in that the stiffness compensation modeling step includes a step of replacing a rigid object to be analyzed modeled with a rigid body in the system model construction step with an object to be divided in the step of dividing the object to be analyzed, A step of applying a fastening condition to apply an existing fastening condition of an object to be stiffly analyzed, an elastic model forming step of forming an elastic model on the divided object using the displacement-load data extracted in the data extracting step, There is provided an endurance analysis method using a dynamic load that does not require a separate process to compensate for the accuracy of stiffness, including a model stiffness adjustment step of adjusting stiffness data to perform rigid body motion in a direction in which there is no motion.

The present invention is characterized in that the elastic model forming step forms an elastic model by synthesizing or dividing the displacement-load data according to the number of divided parts of the object of stiffness analysis by the division criterion setting step and the analysis object division step The present invention has an effect of providing a durability analysis method using a dynamic load that can be flexibly analyzed according to the accuracy of the required analysis, the analysis time, and the user's intention.

The present invention is characterized in that the stiffness compensation modeling step is performed automatically based on information on a fastening configuration of the object to be analyzed in the system model construction step and data on the object to be analyzed that reflects the stiffness analyzed in the stiffness analysis step The present invention provides an endurance analysis method using a dynamic load that can reduce a time required for a user to input or manipulate the robot, reduce an error caused by a user's input, reduce an analysis time, and perform convenient analysis do.

The present invention is characterized in that the load calculating step includes a load analyzing step of analyzing loads of each object based on the loads inputted in the system model constructing step and an analysis result storing load of each object There is an effect of providing an endurance analysis method using a dynamic load that can significantly shorten the time required for system analysis by performing load analysis of the entire system once or at least including a storage step.

The present invention is characterized in that the load calculation step is automatically performed based on the results of the system model construction step, the analysis object designation step, and the stiffness compensation modeling step, and the load analysis step and the analysis result storage step are automatically performed It is possible to provide an endurance analysis method using a dynamic load capable of reducing the input or operation time, reducing an error caused by a user's input, reducing analysis time, and enabling convenient analysis.

The present invention is characterized in that the durability analysis step includes a flexible body conversion step of configuring the durability analysis object designated by the durability analysis object designation step as a flexible body, a load calculation step of calculating a load result calculated in the load calculation step, The method includes the steps of applying a load result to an object to be durabled, reflecting the connection conditions of the object to be analyzed, performing the durability analysis of the object to be durability based on the applied load, evaluating the strength durability and fatigue durability by outputting the stress result And an endurance analysis executing step. Accordingly, an effect of providing an endurance analysis method using a dynamic load capable of performing an accurate endurance analysis of an object to be analyzed is derived.

The present invention is characterized in that the durability analysis step includes an independent model construction step for executing a separate analysis model environment before the flexible body conversion step, wherein the durability analysis step includes a multibody dynamics model configuration environment of the system model configuration step And the durability analysis based on the flexible body can be performed in a separate unit in a separate environment to greatly reduce the time required for the system analysis. There is an effect of providing a method.

 The present invention is characterized in that the durability analysis step includes the steps of the system model construction step, the stiffness analysis object designation step, the division criterion setting step, the analysis object division step, the stiffness analysis step, the stiffness compensation modeling step, the load calculation step, The present invention is characterized in that it is performed automatically based on the result, and it is possible to reduce the input or operation time by the user, reduce the error that may be caused by the user's input, And has an effect of providing an analysis method.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view for explaining an endurance analysis method using a dynamic load according to an embodiment of the present invention; FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an endurance analysis method using a dynamic load according to another embodiment of the present invention.
3 is a view of a stiffness analysis step according to still another embodiment of the present invention.
4 is a diagram of a stiffness compensation modeling step according to another embodiment of the present invention.
5 is a diagram of a load calculating step according to still another embodiment of the present invention.
6 is a view of an endurance analysis step according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a dynamic analysis method using a dynamic load according to the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail to avoid unnecessarily obscuring the subject matter of the present invention. Unless defined otherwise, all terms used herein are the same as the general meaning of the term understood by those of ordinary skill in the art to which this invention belongs and, if conflict with the meaning of the terms used herein, And the definition used in the specification.

FIG. 1 is a view showing steps of an endurance analysis method using a dynamic load according to an embodiment of the present invention, and FIG. 2 is a view showing steps of an endurance analysis method using a dynamic load according to another embodiment of the present invention.

1, the durability analysis method using the dynamic load includes a system model construction step S1, a stiffness analysis object designation step S2, a division criterion setting step S3, an analysis object division step S4, An analysis step S5, a stiffness compensation modeling step S6, a load calculation step S7, an endurance analysis object designation step S8, and an endurance analysis step S9. However, as shown in FIG. 2, the segmentation criterion setting step S3 and the analysis object segmentation step S4 may be performed after the stiffness analysis step S5, which will be described later.

The system model construction step S1 is a step of constructing or modeling a rigid body based overall system model including a part to be subjected to endurance analysis based on MBD. The entire system is constituted by a plurality of objects including a rigid body and an elastic body, and information such as a joint condition, a coupling relationship between the objects, and a position is input. The MBD-based system model includes a rigid body, a joint, an elastic body (spring), a load element, and the like.

The stiffness analysis object designation step S2 is a step in which the user designates a specific object requiring rigidity analysis among the objects of the entire system model modeled in the system model construction step S1.

In setting the segmentation criterion S3, the object to be stiffness-analyzed specified in the stiffness analysis object designating step S2 is replaced with a divided stiffness compensation model to be used in the stiffness compensation modeling step S6, The step of setting the division standard of the model in advance according to the user's selection. The number of divisions can be freely set according to the accuracy of the analysis intended by the user, and the dividing method can be variously set in the horizontal direction, vertical direction, diagonal direction, and curved surface division. Preferably, the dividing method may be a method of dividing into a plurality of small rectangular units.

The analysis object segmentation step S4 is a step of dividing the object of stiffness analysis based on the division criterion set by the user in the division criterion setting step S3.

The stiffness analysis object segmented through the division standard setting step S3 and the analysis object division step S4 is divided into the segmentation of the multibody kinetic model of the system model construction step S1 in the following stiffness compensation modeling step S6 Since the entire stiffness analysis target object is replaced and applied, the dividing reference setting step S3 and the analysis object dividing step S4 may be performed after the next stiffness analysis step S5.

Hereinafter, the relationship between the division criterion setting step S3, the analysis object division step S4 and the stiffness analysis step S5, and the order of each step will be described.

First, the dividing reference setting step S3 and the analysis object dividing step S4 may be performed independently of the stiffness analyzing step S5. This method is a method suitable for the automation process. In the stiffness analysis step S5, the object to be stiffness analysis is modeled separately as a flexible body, and the stiffness value is extracted. The displacement-load data The stiffness value K is automatically synthesized or divided in the stiffness compensation modeling step S6 based on the number of divided parts of the object of stiffness analysis made in the division standard setting step S3 and the analysis object division step S4, The model is modeled as an elastic model between the stiffness analysis target objects. The detailed process of the stiffness compensation modeling step (S6) will be described later.

On the other hand, the stiffness analysis step S5 may be dependent on the division criterion setting step S3 and the analysis object division step S4. In this case, the division standard setting step S3 and the analysis object division step S4 are performed prior to the stiffness analysis step S5, and the flexible body conversion step S53 of the stiffness analysis step S5 is omitted . For example, in the case where the object to be stiffness-analyzed is divided into three parts, two parts of the displacement-load data (or the stiffness value or the stiffness value) are obtained by applying the load according to the displacement in six directions to the other two bodies, K). That is, n-1 displacement-load data (or stiffness value, K) corresponding to the number of divided objects is analyzed based on the number n of objects divided in the analysis object division step S4. Further, the number of derived displacement-load data (or stiffness value) can be further increased by changing the object set as the fixed portion according to the setting of the user, and thereby the additional displacement-load data between the object and the object (Or the stiffness value, K) may be further calculated to enable more accurate analysis.

However, even if the segmentation criterion setting step S3 and the analysis object segmentation step S4 are located before the stiffness analysis step S5, the segmentation of the object and the analysis of the stiffness do not necessarily have to be dependent, And the analysis of the stiffness may be performed independently.

FIG. 3 is a view showing a stiffness analysis step (S5) according to still another embodiment of the present invention.

The stiffness analysis step (S5) is a step of analyzing the stiffness of the stiffness analysis object designated in the stiffness analysis object designation step (S2). 3, the stiffness analysis step S5 includes a stiffness direction setting step S51, an independent model construction step S52, a flexible body conversion step S53, and a data extraction step S54 can do.

The stiffness direction setting step S51 is a step of setting the direction of stiffness to be obtained from the stiffness analysis object designated in the stiffness analysis object designation step S2. Since the rigidity of an object resists deformation, the rigidity of the object can be calculated differently depending on the point and direction at which the load acts. Therefore, based on the joint or the fastening condition and position of the object to be analyzed, The user can set the direction of the load acting on the object of stiffness analysis and the direction of the stiffness according to the point.

The flexible body conversion step S53 is a step of constructing or modeling the object to be rigidly deformed by a flexible body rather than a rigid body. Preferably, the flexible body conversion step S53 may convert the object to be rigidly analyzed into a flexible object by using a finite element method or a mesh free method. As described above, when the stiffness analysis step S5 is dependent on the division criterion setting step S3 and the analysis object division step S4, the flexible body conversion step S53 may be omitted.

In the data extraction step S54, the stiffness analysis is performed in consideration of the connection position and the dividing criterion of the joint based on the rigid object to be flexibly transformed in the flexible body conversion step S53, and the stiffness direction setting step S51 And the displacement-load data with respect to the stiffness direction defined in the step of FIG. The displacement-load data can be calculated according to the position and number of joints and loads of the object to be analyzed.

Hereinafter, a process of deriving the displacement-load data (or stiffness value) according to the number of connection structures of the object of stiffness analysis will be described.

(X, y, z,? X,? Y, and? Z) are set to 0 when the connecting structure or the connecting portion of the object of stiffness analysis is two, and any one connecting portion is regarded as a fixed portion for stiffness measurement And one displacement-load data or stiffness value (K) can be derived by measuring the load per direction by applying a displacement to each of the six directions on the other connecting portion.

Preferably, the displacement-load data or the stiffness value K may be represented by a displacement-load graph or a stiffness matrix of a full matrix or a diagonal matrix as shown below.

[Matrix 1] Full matrix stiffness matrix

[Matrix 2] Diagonal matrix stiffness matrix

 Each component of the stiffness matrix may be used as a constant value in the stiffness compensation modeling step (S6), or as each displacement-load spline data. Depending on the accuracy of the required analysis, the user may use either of the two matrices Can be selected.

In the same principle, when the connection structure or the connecting portion of the rigid object to be analyzed is n, any one connecting portion for stiffness measurement is set as the fixed portion, and the displacement (x, y, z,? X,? Y, ) Is set to 0, and the remaining connection portions are measured for displacement with respect to the load in six directions to derive n-1 displacement-load data or stiffness value (K).

Also, the user can derive the displacement-load data or the stiffness value (K) by setting an arbitrary group including at least one of the n connecting units, and the connecting unit is formed into m arbitrary groups M-1 stiffness values may be derived.

Further, the number of derived displacement-load data (stiffness value) can be increased by changing the object set as the fixed portion according to the setting of the user, thereby deriving the stiffness value between the object and the object, It may be possible to make an accurate interpretation.

Preferably, the stiffness analysis step (S5) includes an independent model construction step (S52) of executing a separate analytical model environment after the stiffness direction setting step (S51), and the flexible body transformation step (S53) and The data extraction step S54 is performed independently of the multibody kinematic model construction environment of the system model construction step S1 so that the entire analysis time is reduced and the accuracy of the analysis is improved. And the analysis time is efficiently utilized.

More preferably, the independent model construction step S52, the flexible member conversion step S53, and the data extraction step S54 are performed in the modeling data of the system model construction step S1 and the stiffness direction setting step S51 And can be performed automatically based on the set data.

In addition, as described above, the division criterion setting step S3 and the analysis object division step S4 may be performed after the stiffness analysis step S5.

 FIG. 4 is a diagram of a stiffness compensation modeling step (S6) according to another embodiment of the present invention.

The stiffness compensation modeling step S6 is a step in which the stiffness analysis object formed of a rigid body in the system model construction step S1 is divided into the division in the analysis object division step S4 and the stiffness analysis in the stiffness analysis step S5 And the model is replaced with the reflected stiffness compensation model. 4, the stiffness compensation modeling step S6 includes the steps of replacing the divided model S61, applying the coupling condition S62, constructing the elastic model S63, adjusting the stiffness of the model S64, . ≪ / RTI >

The segmentation model replacement step S61 is a step of replacing the rigid body-based analysis object modeled in the system model construction step S1 with the divided object to be analyzed in the analysis object segmentation step S4.

The step of applying the fastening condition (S62) is a step of applying the fastening condition of the object to be analyzed modeled in the existing system model construction step (S1) to the replaced object through the split model replacement step (S61).

The elastic model forming step S63 is a step of constructing an elastic model for the divided object using the displacement-load data extracted in the data extracting step S54. Construction of the detailed elastic model will be described later. Preferably, the elastic model may be a spring model.

In the model stiffness adjusting step S64, the stiffness is set to a sufficiently large value in a direction in which there is no result of the stiffness analysis among the connecting portions of the object to be analyzed, and the displacement-load data (Or stiffness value).

Hereinafter, an elastic model reflecting the division criterion of the object divided in the analysis object division step S4 and the number of displacement-load data (or stiffness value) derived in the stiffness analysis step S5 is constructed, Will be described in detail. The number of the rigidities and the number of divisions may be varied depending on the fastening structure of the object to be analyzed and the user's designation, and the connecting method of the elastic model is not limited to the following example, and various connecting methods can be applied.

For example, only the displacement-load data or the stiffness value of the object of stiffness analysis is derived in the stiffness analysis step S5 (only the derived displacement-load data or stiffness value is referred to as K) If the object of stiffness analysis is divided into two objects in step S4, the two divided objects to be analyzed are connected to an elastic model reflecting the K value derived above.

Further, when the object to be analyzed is divided into n objects along the same direction in the analysis object division step S4, the K value is divided into n new K 'values and applied between n divided objects. At this time, a relation of K '= (n-1) K is established.

 On the other hand, when the K value is derived in plural, if the number of K values is equal to the value (n-1) obtained by subtracting 1 from the number of divided objects n of the object of stiffness analysis, 1 / K '= 1 / K1 + 1 if the number of K values is greater than the value obtained by subtracting 1 from the number of divided objects, and the elastic model is connected between the corresponding divided object and the object set as the fixed portion. /K2+...+1/Kn is connected between the divided object and the fixed object.

That is, the displacement-load data (or stiffness value, K) is calculated on the basis of the number of objects divided in the elastic model forming step S63 and the number of the derived displacement-load data (or stiffness value, K) The elastic model of the elastic model enables efficient analysis of the whole system analysis and greatly reduces the analysis time compared with the conventional analysis method. .

  Preferably, the stiffness compensation modeling step (S6) includes: a step of determining whether or not the information on the fastening configuration of the object to be analyzed in the system model building step (S1) and the information on the fastening structure of the object to be analyzed Can be done automatically based on.

FIG. 5 is a diagram of a load calculation step S7 according to still another embodiment of the present invention. FIG.

The load calculation step (S7) is a step of calculating a load result of the connection component parts of the multi-body dynamics model to which the stiffness compensation model is applied according to time. The multibody dynamics analysis is performed by applying the load input in the system model building step S1 to a multibody dynamic model (MBD) model reflecting the stiffness compensation modeling step S6. As shown in FIG. 5, the load calculation step S7 may further include a load analysis step S71 and an analysis result storage step S72.

The load analysis step S71 is a step of analyzing the load on the connection constituent part of each object based on the load inputted in the system model construction step S1. The connection component may be a joint or load of the object and extracts the load results over time for the six degrees of freedom of the connection component.

The analysis result storing step S72 is a step of storing the loads at the connection constituent parts of the respective objects analyzed in the load analysis step S71.

Preferably, the load calculation step S7 is performed in the load analysis step S71 and the load analysis step S7 based on the results of the system model construction step S1, the stiffness analysis object designation step S2 and the stiffness compensation modeling step S6. And the analysis result storage step S72 may be automatically performed.

That is, according to the present invention, the load analysis of the entire system is performed once or at least to perform the load analysis of the entire system as described above, and the load analysis acting on the connection part of the parts is extracted, By performing independent and independent units, the time required for system analysis can be greatly shortened.

The durability analysis target designation step S8 is a step of designing an endurance analysis object to be analyzed in the endurance analysis step S9, which will be described later, among various objects of the multi-body dynamics (MBD) model modeled in the system model construction step S1 . The durability analysis object may be an object that has been subjected to the stiffness compensation modeling step (S6) or may be an initially modeled MBD model.

 FIG. 6 is a view showing an endurance analysis step (S9) according to still another embodiment of the present invention.

The durability analysis step S9 is a step of performing the durability analysis of the object based on the load result calculated in the load calculation step S7. As shown in FIG. 6, the durability analysis step S9 may further include a flexible body conversion step S92, a load result application step S93, and an endurance analysis step S94.

 The flexible object conversion step S92 is a step for converting the durability analysis object into a flexible object by using Finite Element or Meshfree method for the endurance analysis execution step S94.

The load result applying step S93 is a step of applying the load result calculated in the load calculating step S7 to the linking condition and connection position of the object to be analyzed modeled in the system model constructing step S1, This is the step that is applied to the durability analysis object.

The endurance analysis execution step S94 is a step of performing the endurance analysis of the endurance analysis object based on the applied load. The durability analysis can be performed using a structural dynamics analyzer. The durability analysis reflecting the dynamic load is performed to output the stress results, and the strength durability and the fatigue durability are evaluated based on the output results.

Preferably, the durability analysis step S9 includes an independent model construction step S91 for executing a separate analytical model environment before the flexible body conversion step S92, so that the system model construction step S1 It can be performed independently in a multi-object dynamics model configuration environment and in a separate model configuration environment, thereby shortening the analysis time and facilitating the analysis.

More preferably, the flexible body conversion step (S92), the load result application step (S93), and the duration analysis execution step (S94) may be automatically performed for shortening the analysis time and for convenience of analysis.

The foregoing detailed description is illustrative of the present invention. In addition, the foregoing is intended to illustrate and explain the preferred embodiments of the present invention, and the present invention may be used in various other combinations, modifications and environments. That is, it is possible to make changes or modifications within the scope of the concept of the invention disclosed in this specification, within the scope of the disclosure, and / or within the skill and knowledge of the art. The embodiments described herein are intended to illustrate the best mode for implementing the technical idea of the present invention and various modifications required for specific applications and uses of the present invention are also possible. Accordingly, the detailed description of the invention is not intended to limit the invention to the disclosed embodiments. In addition, the appended claims should be construed to include other embodiments.

S1: Steps for configuring the system model
S2: Designation stage of stiffness analysis target
S3: step of setting division criterion
S4: Analysis target segmentation step
S5: Stiffness analysis step
S6: Stiffness compensation modeling step
S7: Load calculation step
S8: Durability analysis target specification step
S9: Durability analysis step

Claims (17)

A system model constructing step of constructing a multi-object system as a rigid-body multi-body dynamics model,
A stiffness analysis target designation step of designating a stiffness analysis object requiring an analysis of stiffness among the objects of the multibody system;
A stiffness analysis step of analyzing stiffness of the stiffness analysis object;
A stiffness compensation modeling step of replacing the object of stiffness analysis of the multibody dynamic model with a stiffness compensation model reflecting the stiffness analysis in the stiffness analysis step;
A load calculating step of calculating a load result with time of a connecting constituent part of the multibody kinetic model to which the stiffness compensation model is applied;
An endurance analysis target designation step of designating an endurance analysis object among the multibody kinetic models;
And an endurance analysis step of performing an endurance analysis of the endurance analysis object based on the load result,
A multibody dynamics analysis, and a durability analysis for performing an endurance analysis that reflects a dynamic load applied to an object can be automatically performed through a single integrated process.
Durability analysis method using dynamic load.
delete delete The method according to claim 1,
The durability analysis method using the dynamic load
A dividing criterion setting step of setting a criterion for dividing the stiffness analysis object after the stiffness analysis object designation step,
Further comprising an analysis object division step of dividing the stiffness analysis object based on the reference of the division criterion setting step
Durability analysis method using dynamic load. The method according to claim 1,
A durability analysis method using the dynamic load includes a dividing criterion setting step of setting a criterion for dividing the object of stiffness analysis after the stiffness analysis step,
And a stiffness analysis target division step of dividing the object to be analyzed based on the criterion of the division criterion setting step
Durability analysis method using dynamic load. 6. The method according to any one of claims 4 to 5,
The stiffness analysis step may include:
A stiffness direction setting step of setting a direction of stiffness to be obtained from the stiffness analysis object;
A flexible body conversion step of converting the rigid object to be analyzed modeled as a rigid body into a flexible body;
A data extracting step of extracting displacement-load data of the object of stiffness analysis
≪ / RTI >
Durability analysis method using dynamic load. The method according to claim 6,
The stiffness analysis step may include:
And an independent model construction step of executing a separate analytical model environment after the stiffness direction setting step,
Characterized in that the flexible body conversion step and the data extraction step are performed independently in a model configuration environment separate from the multibody kinematic model configuration environment of the system model configuration step
Durability analysis method using dynamic load. 8. The method of claim 7,
The independent model construction step, the flexible member conversion step, and the data extraction step are automatically performed based on the modeling data of the system model construction step and the data set in the stiffness direction setting step
Durability analysis method using dynamic load. 6. The method according to any one of claims 4 to 5,
Wherein the stiffness compensation modeling step comprises:
A step of replacing a stiffness analysis object modeled with a rigid body in the system model construction step with an object to be analyzed in the analysis object division step,
A fastening condition applying step of applying an existing fastening condition of the object of stiffness analysis in the system model forming step,
An elastic model construction step of constructing an elastic model on the divided object using the displacement-load data extracted in the data extraction step,
And a model stiffness adjusting step of adjusting the stiffness data so as to perform rigid-body motion in a direction in which there is no result of the stiffness analysis
Durability analysis method using dynamic load.
10. The method of claim 9,
Wherein the elastic model forming step composes an elastic model by compositing or dividing the displacement-load data according to the number of divided parts of the stiffness analysis object by the division criterion setting step and the analysis object dividing step
Durability analysis method using dynamic load. 11. The method of claim 10,
The elastic model configuration step
And changing the displacement-load data to a constant value.
Durability analysis method using dynamic load. 11. The method of claim 10,
Wherein the stiffness compensation modeling step comprises:
Based on the information on the fastening configuration of the object to be analyzed in the system model construction step and the data on the object to be analyzed that reflects the stiffness analyzed in the stiffness analysis step
Durability analysis method using dynamic load. 6. The method according to any one of claims 4 to 5,
The load calculation step includes a load analysis step of analyzing loads of the respective objects based on the loads inputted in the system model construction step and an analysis result storage step of storing the loads at the connection constituent parts of the analyzed objects Characterized in that
Durability analysis method using dynamic load. 14. The method of claim 13,
Wherein the load calculation step is automatically performed based on the results of the system model construction step, the analysis object designation step, and the stiffness compensation modeling step, and the load analysis step and the analysis result storage step are automatically performed
Durability analysis method using dynamic load. 6. The method according to any one of claims 4 to 5,
The endurance analysis step
A flexible body conversion step of configuring the durability analysis object designated in the durability analysis target designation step with a flexible body;
A load result applying step of applying the load result calculated in the load calculating step to the durability analyzing object by reflecting connection conditions of the object to be analyzed modeled in the system model constructing step,
And performing an endurance analysis of the durability analysis object based on the applied load and outputting a stress result to evaluate the strength durability and fatigue durability
Durability analysis method using dynamic load. 16. The method of claim 15,
The endurance analysis step may be performed before the fluidized-
Including an independent model construction step to execute a separate analytical model environment,
Wherein the durability analysis step is performed independently of the multibody dynamic model configuration environment of the system model configuration step and in a separate model configuration environment
Durability analysis method using dynamic load. 17. The method of claim 16,
The durability analysis step is based on the results of the system model construction step, the stiffness analysis object designation step, the division criterion setting step, the analysis object division step, the stiffness analysis step, the stiffness compensation modeling step, the load calculation step, Characterized in that it is carried out automatically
Durability analysis method using dynamic load.

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