A method for simulating and modeling the pulling force of a plastic buckle based on ANSA

Abstract

The application relates to a plastic buckle pulling force simulation modeling method based on ANSA, which comprises the following steps: creating a local coordinate system to define the direction of buckle pulling; calling a created binding constraint module to define the binding constraint of the fixed-end buckle; calling a created coupling and loading constraint module to load a force value curve on the force-applied-end buckle according to the defined direction; calling a defined contact module command to define the contact between the fixed-end buckle and the force-applied-end buckle; and finally calling a defined analysis step command to realize the definition of dynamic analysis. The application has the advantages that the problems of repeated and tedious buckle pulling force model building and easy errors are solved, the requirement for the professionalism of operators can be reduced, the modeling time can be effectively saved, the modeling difficulty can be reduced, and the modeling accuracy can be ensured.

Description

Technical Field

[0001] This invention relates to the field of vehicle simulation modeling technology, and in particular to a simulation modeling method for the pull-out force of plastic clips based on ANSA. Background Technology

[0002] ANSA is a general-purpose CAE simulation and analysis data platform. Currently, modeling with ANSA requires step-by-step clicking operations according to function, demanding a high level of expertise from the operator. Due to the wide variety and large quantity of plastic clips, even for professional operators, the modeling process is time-consuming and prone to errors. There is an urgent need for a procedural modeling method for clips to reduce the skill requirements of the operator, save modeling time, and ensure modeling accuracy. Summary of the Invention

[0003] In view of the above problems, the purpose of this invention is to provide a simulation modeling method for the pull-out force of plastic clips based on ANSA. The use of program modeling can effectively simplify the operation of clip pull-out force modeling, ensure the accuracy of modeling, and at the same time, the application of the program also saves modeling time, effectively overcoming the shortcomings of the above-mentioned prior art.

[0004] This invention provides a simulation modeling method for the pull-out force of plastic clips based on ANSA, which specifically includes the following steps:

[0005] Step S1: Using the Cartesian coordinate system establishment module in ANSA, a local coordinate system is created in the Cartesian coordinate system by selecting feature nodes. The local coordinate system is used to redefine the direction of the buckle being pulled out. The feature nodes are selected based on the actual buckle shape and are nodes whose coordinates can be defined.

[0006] Step S2: Using ANSA's node and coupling constraint creation module, redefine a reference point in the Cartesian coordinate system as the loading point of the force-applying end buckle, and perform distributed coupling constraints with the pull-out force action area on the buckle.

[0007] Step S3: Use ANSA's coupling constraint module to dynamically couple the areas that need to be bound on the buckle; then use ANSA's binding constraint module to bind the reference points of the coupling constraint.

[0008] Step S4: Transform the loading point created in step S2 from the Cartesian coordinate system in step S1 to the created local coordinate system; use the curve definition module to obtain the loading curve of the pull-out force of the loading point; then load the buckle loading point according to the loading curve along the Z direction of the local coordinate system in step S1.

[0009] Step S5: Define the contact relationship between the force-applying end latch and the fixed end latch. Using the ANSA contact definition module, select the contact area between the force-applying end latch and the fixed end latch to complete the contact definition between the force-applying end latch and the fixed end latch.

[0010] Step S6: Use the ANSA definition analysis step module to complete the parameter definition for the buckle dynamic analysis;

[0011] The advantages and positive effects of this invention are:

[0012] 1. The present invention utilizes modular modeling, which can effectively simplify the operation of buckle pull-out force modeling, ensure the accuracy of modeling, and the modular definition also saves modeling time.

[0013] 2. This application solves the problem of repetitive, tedious, and error-prone model building, which can reduce the professional requirements of operators, effectively save modeling time, reduce modeling difficulty, and at the same time ensure modeling accuracy. Attached Figure Description

[0014] 1. Figure 1 This is a flowchart from Embodiment 1 of the present invention.

[0015] 2. Figure 2 This is a schematic diagram of the snap-fit ​​structure in Embodiment 2 of the present invention. Detailed Implementation

[0016] In the following description, numerous specific details are set forth for illustrative purposes and to provide a thorough understanding of one or more embodiments. However, it will be apparent that these embodiments may also be implemented without these specific details. In other instances, well-known structures and devices are shown in block diagram form for ease of description of one or more embodiments.

[0017] Example 1

[0018] This embodiment provides a simulation modeling method for the pull-out force of plastic clips based on ANSA, which specifically includes the following steps:

[0019] Step S1: Using the Cartesian coordinate system establishment module in ANSA, a local coordinate system is created by selecting feature nodes in the Cartesian coordinate system. The local coordinate system is used to redefine the direction of the buckle being pulled out. The feature nodes are nodes whose coordinates can be defined based on the actual buckle shape. These nodes are nodes on the mesh in ANSA.

[0020] Step S2: Using the node and coupling constraint creation module of ANSA, redefine a reference point in the Cartesian coordinate system as the loading point of the force-applying end buckle, and perform distributed coupling constraints with the pull-out force application area on the buckle (the point where the buckle is pulled out and subjected to force); the distributed coupling constraints of the pull-out force application area can be realized by picking the pull-out force application area on the buckle; this step is to define the buckle coupling constraints.

[0021] Step S3: Since the fixed end buckle needs to be bound according to the actual situation; use ANSA's coupling constraint module to dynamically couple the area on the buckle that needs to be bound; then use ANSA's binding constraint module to bind the reference point of the coupling constraint; specifically, dynamically couple the newly created planned binding constraint node with the area on the buckle that needs to be bound, and apply the binding constraint on the newly created reference point. This step is to define the buckle constraint boundary conditions.

[0022] Step S4: Transform the pull-out force loading point created in Step S2 from the Cartesian coordinate system (global coordinates) in Step S1 to the created local coordinate system; use the curve definition module to obtain the loading curve of the pull-out force of the loading point; then load the buckle loading point along the Z direction of the local coordinate system in Step S1 according to the loading curve; this step is to define the buckle load.

[0023] Step S5: Define the contact relationship between the force-applying end latch and the fixed end latch. Using the ANSA contact definition module, select the contact area between the force-applying end latch and the fixed end latch to complete the contact definition between the force-applying end latch and the fixed end latch; this step is to define the latch contact.

[0024] Step S6: After the modules in steps S1-S5 above are redefined, the parameter definition for the snap fastener dynamic analysis is completed using the definition analysis step module of ANSA. Specifically, the parameter definition involves confirming the calculation method, output settings, calculation time, and other information corresponding to the snap fastener. After the parameter definition for the dynamic analysis is completed, the defined data from the above steps are submitted to the solver for calculation.

[0025] Example 2

[0026] See Figure 2In this embodiment, a local coordinate system is established in the Cartesian coordinate system based on the characteristic coordinates 1, 2, and 3 of the buckle as defined coordinates, and the direction of buckle pull-out is redefined. The binding constraint definition is performed on the fixed-end buckle by calling the create binding constraint module. The force-applying end buckle is loaded with a force curve according to the defined direction by calling the create coupling and loading constraint module. The contact between the fixed-end and force-applying end buckles is defined by calling the define contact module command. Finally, building the buckle model in ANSA using the above definition commands takes only 5 minutes, which is more than 80% more efficient than traditional button modeling methods.

[0027] This is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A simulation modeling method for the pull-out force of plastic clips based on ANSA, characterized in that, Includes the following steps: Step S1: Using the Cartesian coordinate system creation module in ANSA, a local coordinate system is created by selecting feature nodes in the Cartesian coordinate system. The local coordinate system is used to redefine the direction of the buckle being pulled out. The feature nodes are nodes whose coordinates can be defined based on the actual buckle shape. These nodes are nodes on the mesh in ANSA. Step S2: Using ANSA's node and coupling constraint creation module, redefine a reference point in the Cartesian coordinate system as the loading point of the force-applying end buckle, and perform distributed coupling constraints with the pull-out force action area on the buckle. Step S3: Use ANSA's coupling constraint module to dynamically couple the areas that need to be bound on the buckle; then use ANSA's binding constraint module to bind the reference points of the coupling constraint. Step S4: Transform the loading point created in step S2 from the Cartesian coordinate system in step S1 to the created local coordinate system; use the curve definition module to obtain the loading curve of the pull-out force of the loading point; then load the buckle loading point along the Z direction of the local coordinate system in step S1 according to the loading curve. This step is to define the buckle load. Step S5: Define the contact relationship between the force-applying end latch and the fixed end latch. Using the ANSA contact definition module, select the contact area between the force-applying end latch and the fixed end latch to complete the contact definition between the force-applying end latch and the fixed end latch. Step S6: Use the ANSA definition analysis step module to complete the parameter definition for the buckle dynamic analysis.

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