Rapid modeling analysis method for structural design of anti-collision guardrail

Abstract

The invention discloses a quick modeling analysis method for structural design of an anti-collision guardrail. The quick modeling analysis method comprises the following steps: establishing a grid model; automatic assembly: determining an assembly relation according to the assembly coordinate system of each component model, and completing the assembly behavior of the guardrail by means of affine transformation; generating bolts: automatically generating corresponding bolt hole sites on the assembled guardrail system according to the node information, and automatically generating entity bolts according to the hole site information; inputting a vehicle model: introducing a car, passenger car or truck grid model according to user requirements; grading verification: carrying out bolt connection opposite-pull test on the guardrail plate, carrying out pressure bearing capacity test on a stand column and an anti-blocking block in the horizontal direction, and carrying out structural stability test on a double-plate system under the condition that the double-plate system is only subjected to self weight; outputting a calculation file; according to the method, manual intervention is reduced, the modeling efficiency is remarkably improved, man-made errors are reduced, the safety performance evaluation parameters of the guardrail structure in the scheme design stage can be rapidly obtained, and then the guardrail design period is shortened.

Description

Technical Field

[0001] The invention belongs to the technical field of anti-collision guardrail design, and in particular relates to a rapid modeling and analysis method for anti-collision guardrail structure design. Background Art

[0002] During the design phase of the guardrail structure, engineers need to continuously optimize the structural forms of components such as guardrail panels and barrier blocks to improve the mechanical properties and safety of the guardrail.

[0003] At present, the modeling and simulation process of the guardrail system mainly includes the following steps: first, use CAD drawing software to draw the engineering drawings of each component, then manually extract the profile structure information based on the CAD drawings to establish the finite element model of each component structure of the guardrail, and then use the software to simulate the constructed finite element model. In the scheme design stage, the structure of each component is uncertain. Under the existing technical framework, engineers must repeat the same and complex load settings for each structural change, which seriously restricts the rapid iteration of structural design.

[0004] First draw in the drawing software, then manually extract the structural dimension information of the components from the drawings to build the mesh model. This modeling process is time-consuming and prone to errors due to a large number of manual operations. Each time the structure is changed, the same load and boundary conditions need to be set repeatedly, which is inefficient. Therefore, how to shorten the existing structural modeling time and improve the simulation efficiency is a technical problem that needs to be solved urgently by technicians in this field. Summary of the invention

[0005] The present invention provides a rapid modeling and analysis method for anti-collision guardrail structure design, using ANSA finite element pre-processing software as a tool, using HAWP geometric recognition model and parametric modeling method to create a three-dimensional mesh model of the component; secondary development of ANSA is performed to create a rapid modeling method for guardrail vehicle collision model, and generate calculation files suitable for a variety of finite element solvers. This design effectively avoids compatibility issues between CAD software and pre-processing software, reduces manual intervention, significantly improves modeling efficiency and reduces human errors, can quickly obtain safety performance evaluation parameters of guardrail structure in the scheme design stage, and thus shorten the guardrail design cycle to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A rapid modeling and analysis method for anti-collision guardrail structure design includes the following steps: S1: Establishing mesh model: Each component model is a three-dimensional mesh model; S2: Automatic assembly: Determine the assembly relationship according to the assembly coordinate system of each component model, and complete the assembly of the guardrail with the help of affine transformation; S3: Generate bolts: Automatically generate corresponding bolt hole positions on the assembled guardrail system according to the node information, and automatically generate solid bolts according to the hole position information; S4: Input vehicle model: Introduce car, bus or truck grid model according to user needs, and vehicle collision angle and speed are optional; S5: Grading verification: Grading verification is introduced while generating full-size calculation files, including bolt connection tension test of guardrail panels, horizontal pressure bearing capacity test of columns and guard blocks, and structural stability test of double-board system under deadweight only; S6: Output calculation file.

[0007] Preferably, S3 also includes installing a simulated guardrail panel to simulate the dynamic relaxation phenomenon that occurs during the installation process due to prestressed insertion.

[0008] Preferably, the bolt connection tension test of the guardrail plate includes the following steps: based on the model file of the guardrail plate and the connection bolt hole positions as inherent local properties, two guardrail plates connected by solid bolts are automatically generated, wherein a fixed constraint is applied on one side of one plate, and a displacement load is applied on the opposite side of the other plate, the bolts have a pre-tightening force, and the guardrail plates have a dynamic relaxation phenomenon simulated during the installation process.

[0009] Preferably, the test of the bearing capacity of the column and the barrier block in the horizontal direction includes the following steps: according to the model file of the column and the barrier block and the bolt hole position and assembly coordinates as inherent local attributes, the column and the barrier block are automatically assembled and connected by solid bolts with pre-tightening force; a steel plate parallel to the connecting surface of the barrier block and the guardrail is automatically generated, and a displacement load is applied in a direction perpendicular to the connecting surface; the bottom node of the column has a fixed constraint.

[0010] Preferably, the structural stability test of the double-plate system under the condition of only its own weight includes the following steps: according to the model files of the columns, barrier blocks and guardrail plates, as well as the bolt hole positions and assembly coordinates which are inherent local properties, the double-plate guardrail system is automatically assembled, and the columns, barrier blocks and guardrail plates are connected by solid bolts; the bottom nodes of the columns have fixed constraints; and gravity loading is applied to the overall structure.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. This method reduces manual intervention, significantly improves modeling efficiency and reduces human errors. It can quickly obtain the safety performance evaluation parameters of the guardrail structure in the scheme design stage, thereby shortening the guardrail design cycle.

[0012] 2. It can automatically generate corresponding 3D mesh models based on hand-drawn guardrail and protection block section drawings, avoiding compatibility issues between CAD software and pre-processing software.

[0013] 3. Automatically assemble the guardrail system according to the coordinate system defined on each component model.

[0014] 4. It can quickly generate full-size guardrail collision calculation files for cars, buses and trucks, and is suitable for a variety of finite element solvers.

[0015] 5. Guardrails, protection blocks and column structures can be replaced separately.

[0016] 6. Verify the mechanical capacity of each component of the guardrail system in a graded manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the analytical method of the present invention; Figure 2 This is a schematic diagram of the inherent local properties of the barrier block of an embodiment of the present invention: bolt hole positions and assembly coordinate system.

[0018] Figure 3 It is a schematic diagram of a calculation file of a full-size passenger car collision guardrail according to an embodiment of the present invention; Figure 4 This is a schematic diagram of a calculation file for a full-size car crashing into a guardrail according to an embodiment of the present invention; Figure 5 Schematic diagram of the bolt connection tension test of the guardrail plate according to the embodiment of the present invention Figure 1 ; Figure 6 Schematic diagram of the bolt connection tension test of the guardrail plate according to the embodiment of the present invention Figure 2 ; Figure 7 Schematic diagram of the bolt connection tension test of the guardrail plate according to the embodiment of the present invention Figure 3 ; Figure 8 Schematic diagram of the horizontal pressure bearing capacity test of the column and the barrier block according to the embodiment of the present invention Figure 1 ; Fig. 9 Schematic diagram of the horizontal pressure bearing capacity test of the column and the barrier block according to the embodiment of the present invention Figure 2 ; Fig.10 Schematic diagram of the horizontal pressure bearing capacity test of the column and the barrier block according to the embodiment of the present invention Figure 3 ; Fig.11 Schematic diagram of the structural stability test of the double-plate system of an embodiment of the present invention when it is subjected to only its own weight. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figure 1-4 The present invention provides a rapid modeling and analysis method for anti-collision guardrail structure design, comprising the following steps: S1: Establishing mesh model: Each component model is a three-dimensional mesh model. According to the cross-section drawings or CAD files of the guardrail, anti-block, and column drawn by the user, a three-dimensional mesh model of equal cross-section can be automatically extruded through HAWP geometric analysis and parametric modeling method; S2: Figure 2 As shown, automatic assembly: the assembly relationship of the guardrail system is determined. As the inherent local property of the model, the assembly coordinate system of each component can be determined by the sequence of three nodes on the corresponding model, and the assembly behavior of the guardrail is completed with the help of affine transformation; S3: Figure 2 As shown, generate bolts: As an inherent local property of the model, the bolt hole position can be selected by selecting nodes on the corresponding model. The corresponding bolt hole position is automatically generated on the assembled guardrail system according to the node information, and the solid bolt is automatically generated according to the hole position information; S4: Figure 3-4 As shown, input the vehicle model: the full-size guardrail system model is regarded as a whole, and the assembly coordinate system for alignment with the vehicle model is automatically generated. The car, bus or truck mesh model is introduced according to user needs, and the vehicle collision angle and speed are optional; S5: Gradual verification: The full-size guardrail collision calculation file takes a long time, so the graded verification is introduced when the full-size calculation file is generated to improve the efficiency of the scheme design. Gradual verification is introduced when the full-size calculation file is generated, including the bolt connection tension test of the guardrail plate, the horizontal pressure bearing capacity test of the column and the anti-block, and the structural stability test of the double-plate system under the condition of only self-weight; S6: Output calculation file.

[0021] like Figure 1 As shown, S3 also includes the installation of a simulated guardrail panel, which causes a dynamic relaxation phenomenon due to prestressed plug-in during the installation process; in this embodiment, if the guardrail panel is installed in a plug-in manner, the dynamic relaxation process is automatically introduced in consideration of the prestress of the guardrail panel.

[0022] like Figure 5-7As shown, the bolt connection tension test of the guardrail plate includes the following steps: according to the model file of the guardrail plate and the connection bolt hole position as the inherent local attribute, two guardrail plates connected by solid bolts are automatically generated, one side of one plate is subject to a fixed constraint, the opposite side of the other plate is subject to a displacement load, the bolts have a pre-tightening force, and the guardrail plate has a dynamic relaxation phenomenon simulated during the installation process; in this embodiment, the boundary conditions are defined: the guardrail plates at both ends are trimmed, and constraints are imposed on both ends of the guardrail plates, and they are only allowed to move in the length direction of the plate; a displacement constraint is imposed on the bottom of the column; and the guardrail plates and bolts are set to AUTOMATIC SINGLE SURFACE contact as a whole.

[0023] like Figure 8-10 As shown, the test of the bearing capacity of the column and the barrier block in the horizontal direction includes the following steps: according to the model files of the column and the barrier block and the bolt hole positions and assembly coordinates as inherent local attributes, the column and the barrier block are automatically assembled and connected through physical bolts, and the bolts have pre-tightening force; a steel plate parallel to the connecting surface of the barrier block and the guardrail is automatically generated, and a displacement load is applied in a direction perpendicular to the connecting surface; the bottom node of the column has a fixed constraint; in this embodiment, the column, the barrier block and the bolt are set to AUTOMATIC SINGLE SURFACE contact as a whole, and the contact between the steel plate and the column and the barrier block is set to AUTOMATIC SURFACE TO SURFACE.

[0024] like Fig.11 As shown, the structural stability test of the double-plate system under the condition of only self-weight includes the following steps: according to the model files of the columns, anti-blocks and guardrails, as well as the bolt hole positions and assembly coordinates as inherent local attributes, the double-plate guardrail system is automatically assembled, and the columns, anti-blocks and guardrails are connected by solid bolts; the bottom nodes of the columns have fixed constraints; gravity loading is applied to the overall structure; in this embodiment, the columns, anti-blocks, guardrails and bolts are set to AUTOMATICSINGLE SURFACE contact as a whole.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rapid modeling and analysis method for anti-collision guardrail structure design, characterized in that: The method comprises the following steps: S1: establishing a grid model: each component model is a three-dimensional grid model; S2: Automatic assembly: Determine the assembly relationship according to the assembly coordinate system of each component model, and complete the assembly of the guardrail with the help of affine transformation; S3: Generate bolts: Automatically generate corresponding bolt hole positions on the assembled guardrail system according to the node information, and automatically generate solid bolts according to the hole position information; S4: Input vehicle model: Introduce car, bus or truck grid model according to user needs, and vehicle collision angle and speed are optional; S5: Grading verification: Grading verification is introduced while generating full-size calculation files, including bolt connection tension test of guardrail panels, horizontal pressure bearing capacity test of columns and guard blocks, and structural stability test of double-board system under deadweight only; S6: Output calculation file.

2. The rapid modeling and analysis method for anti-collision guardrail structure design according to claim 1 is characterized in that: S3 also includes the installation of simulated guardrail panels to simulate the dynamic relaxation phenomenon that occurs during the installation process due to prestressed insertion.

3. The rapid modeling and analysis method for anti-collision guardrail structure design according to claim 1 is characterized in that: The bolt connection tension test of the guardrail plate includes the following steps: according to the model file of the guardrail plate and the connection bolt hole position as the inherent local attribute, two guardrail plates connected by solid bolts are automatically generated, a fixed constraint is applied on one side of one plate, and a displacement load is applied on the opposite side of the other plate. The bolts have a pre-tightening force, and the guardrail plate has a dynamic relaxation phenomenon simulated during the installation process.

4. The rapid modeling and analysis method for anti-collision guardrail structure design according to claim 1 is characterized in that: The horizontal pressure bearing capacity test of the column and the barrier block includes the following steps: according to the model file of the column and the barrier block and the bolt hole position and assembly coordinates as inherent local attributes, the column and the barrier block are automatically assembled and connected through solid bolts with pre-tightening force; a steel plate parallel to the connecting surface of the barrier block and the guardrail is automatically generated, and a displacement load is applied in the direction perpendicular to the connecting surface; the bottom node of the column has a fixed constraint.

5. The rapid modeling and analysis method for anti-collision guardrail structure design according to claim 1 is characterized in that: The structural stability test of the double-plate guardrail system under the condition of only self-weight includes the following steps: according to the model files of the columns, barrier blocks and guardrail boards, as well as the bolt hole positions and assembly coordinates as inherent local attributes, the double-plate guardrail system is automatically assembled, and the columns, barrier blocks and guardrail boards are connected by solid bolts; the bottom nodes of the columns are fixedly constrained; and gravity loading is applied to the overall structure.

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