Method for analyzing and processing structural strength of power assembly suspension bracket

Abstract

The invention discloses a method for analyzing and processing the structural strength of a power assembly suspension bracket, which comprises the following steps of: carrying out grid division by utilizing finite element analysis pre-processing software, defining material attributes and generating a model inp file; the invention discloses a GMW14116-based suspension 28 working condition load calculation method, which comprises the following steps of: extracting 28 working condition loads by utilizing automatic dynamic analysis software of a mechanical system, and generating a load inp file; configuring header files of 28 working conditions of the suspension bracket, and carrying out solution calculation by utilizing solver software; sequentially opening a suspension 28 working condition strength calculation result file by utilizing post-processing software, and checking an analysis result; and writing an analysis report. By adopting the technical scheme, the working condition strength analysis efficiency of the suspension 28 can be greatly improved; a large amount of time can be saved in header file configuration and post-processing steps of suspension 28 working condition strength analysis, and meanwhile analysis errors caused by personnel errors in the analysis process are avoided.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of automobile power assembly structure design and analysis processing. More specifically, the present application relates to a power assembly suspension bracket structure strength analysis and processing method. BACKGROUND

[0002] The performance requirements of automobile engines are increasingly improved. The strength and stiffness of engine suspension brackets, as key components, directly affect the durability and safety of the whole vehicle. As the core support component of the power assembly suspension system, the suspension bracket mainly functions to provide support and positioning for the engine, avoid interference or collision with surrounding components when the engine moves in various directions, and isolate the vibration transmitted by the engine itself and uneven road surfaces. Strength analysis of the suspension bracket using CAE can significantly reduce the cost of physical testing, improve product development efficiency, and enhance the pertinence of design schemes, thereby effectively shortening the overall development cycle. The specific technical route for CAE strength analysis of the suspension bracket is as follows:

[0003] 1. Based on the CAD geometric model of the suspension bracket, use the finite element analysis pre-processing software (hypermesh) to perform meshing, define materials and properties, etc., and generate the model inp file.

[0004] 2. Based on the suspension 28 working condition load calculation method of General Motors Company global engineering standard GMW14116, use the multi-body software (adams) to extract the 28 working condition loads and generate the load inp file.

[0005] 3. Based on the inp files generated in steps 1 and 2, configure 28 header files, and use the solver abaqus for batch processing calculation.

[0006] 4. Based on the result file (.odb) output by the solver, use the post-processing software hyperview to open the suspension 28 working condition strength calculation result files in sequence, and refer to the analysis results (if optimization is needed, repeat steps 1, 3, and 4).

[0007] 5. Analyze the results and write an analysis report.

[0008] The technical route map is shown in Figure 1 .

[0009] One of the defects of the prior art is:

[0010] For step 3 of the above technical route, the configured header file must include:

[0011] 1. The "*INCLUDE, INPUT=" command and the referenced model name;

[0012] 2. Definition of analysis steps;

[0013] 3. Boundary conditions;

[0014] 4. Definition of load.

[0015] The commonly used method for configuring header files is to modify the header file template by typing and copying and pasting. Different operating conditions require at least four modifications to the header file. For the 28 suspended operating conditions, this requires 112 manual modifications. The configured header file is then written to an Abaqus ".bat" batch file, a process that also requires at least 28 modifications to the file's contents.

[0016] Using conventional methods for step 3 has the following technical drawbacks:

[0017] 1. The text file needs to be manually modified at least 140 times, which is a large workload and time-consuming.

[0018] 2. Most of the modified text has little difference, making the work tedious and prone to errors.

[0019] The second defect of existing technology:

[0020] Steps 4 and 5 of the above technical route belong to the post-processing part of the suspension strength analysis.

[0021] The common method is to manually open the 28 suspended intensity analysis results one by one, then uniformly adjust the cloud map type, the maximum value of the measurement result, the cloud map angle, the font, the statistical maximum value result, take screenshots of each window, and use the results and screenshots to complete the report in PowerPoint.

[0022] The above steps have the following drawbacks:

[0023] 1. Opening each model individually and making adjustments is repetitive work;

[0024] 2. Compiling reports by statistically analyzing the results one by one and taking screenshots is inefficient and prone to errors.

[0025] Using keywords such as "powertrain; suspension bracket; structural strength," a search was conducted on existing publicly available technical documents, yielding the following results:

[0026] 1. Chinese patent document: "Powertrain suspension bracket and vehicle having the same", patent (application) number: 202320370527.8; the technical solution described therein is:

[0027] "The powertrain mounting bracket includes: a bracket mounting portion adapted to be mounted on a bracket; a powertrain mounting portion connected to one end of the bracket mounting portion and located on the side of the bracket facing the powertrain, the upper part of the powertrain mounting portion connected to the bracket mounting portion and extending towards the powertrain, and the lower part of the powertrain mounting portion extending downward; a first connecting plate and a second connecting plate connected to the bracket mounting portion and the powertrain mounting portion, the first connecting plate and the second connecting plate located on opposite sides in the width direction of the powertrain mounting portion, a groove being formed between the first connecting plate and the second connecting plate, and a drain hole communicating with the bottom of the groove being provided on the side wall of the first connecting plate."

[0028] The technical effects described are:

[0029] The powertrain suspension bracket has advantages such as high structural strength, light weight, easy casting and molding, and prevention of water accumulation.

[0030] 2. Chinese patent document: "A vibration damping power assembly suspension structure and automotive powertrain", patent (application) number: 202120801979.8; the technical solution described therein is:

[0031] "The vibration damping assembly suspension structure includes a suspension bracket body, which includes a closed frame and a U-shaped frame that are fixedly connected in sequence. The open end of the U-shaped frame faces away from the closed frame. The closed frame has an internal damping component connected to it, and the damping component has a first connecting part. The U-shaped frame has a triangular frame inside it. The triangular frame itself and the inner wall of the triangular frame and the U-shaped frame form multiple triangular cavities. The inner walls of the U-shaped frame are connected to each other. The two free ends of the U-shaped frame have a second connecting part."

[0032] The technical effects described are:

[0033] "While increasing the structural strength of the suspension bracket, we do not increase its weight, nor do we increase the cost."

[0034] However, the technical solutions recorded in the aforementioned technical documents, as well as the existing publicly available technical solutions, have not been able to solve the problems and defects in the existing technology, such as "large workload and time-consuming", "low efficiency" and "cumbersome and error-prone". Summary of the Invention

[0035] This invention provides a method for analyzing and processing the structural strength of powertrain suspension brackets, with the aim of improving the efficiency of powertrain suspension bracket structural strength analysis.

[0036] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0037] The powertrain suspension bracket structural strength analysis and treatment method of the present invention comprises the following steps:

[0038] Step 1: Based on the CAD geometric model of the suspension bracket, use finite element analysis preprocessing software to perform mesh generation, define material properties, and generate the model inp file;

[0039] Step 2: Based on the globally accepted engineering standard GMW14116, the 28 load conditions of the suspension system are calculated using ADAMS software, and the 28 load conditions are extracted and a load inp file is generated.

[0040] Step 3: Automatically configure the header files for 28 working conditions of the suspension bracket, and use solver software to perform calculations;

[0041] Step 4: Based on the result files output by the solver, use post-processing software to open the strength calculation result files of the suspension 28 working condition in batches and view the analysis results;

[0042] Step 5: Write the analysis report: Import the screenshots and statistical results from the model file path into PowerPoint to complete the analysis report.

[0043] In step one, the finite element analysis preprocessing software used is Hypermesh software.

[0044] In step three, the solver software used is Abaqus, a finite element analysis software for engineering simulation.

[0045] In step four, the post-processing software used is Hyperview, a CAE engineering simulation visualization post-processing software.

[0046] The specific implementation steps of step three are as follows:

[0047] 1) Create a button named "ABAQUS_load_case" using tcl / tk. Clicking the button will take you to the header file configuration interface.

[0048] 2) Use Tcl in conjunction with the Hypermesh API function "hm_getint" to generate a CPU core requirement window; enter the number of CPU cores in this window to allocate the CPUs required for subsequent simulation calculations, and click the "proceed" button to enter the load file selection window;

[0049] 3) Create a file selection box using tcl / tk_getOpenFile, and select the load file and model file in sequence. After selection, the program will automatically configure the header file and batch file.

[0050] In step four, the following modules are developed using tcl / tk. The specific implementation steps are as follows:

[0051] 1) File selection module;

[0052] 2) Operating condition selection module;

[0053] 3) Window display module;

[0054] 4) Font settings module;

[0055] 5) Screenshot output module;

[0056] 6) Measurement module;

[0057] 7) Functional modules.

[0058] In 1), the file selection module supports users to select “.inp” and “.fem” model files, and also supports users to select the result file type; while “.inp” model files must match “.odb” result files, and “.fem” model files must match “h3d” result files.

[0059] In section 2), the working condition selection module supports users in generating continuous and non-continuous working condition numbers; the program automatically retrieves the working condition files with the corresponding numbers for subsequent batch opening of the model; for example, if 28 working conditions are suspended, this module generates numbers from 1 to 28, and the program will automatically open the working condition files corresponding to these numbers.

[0060] In 3), the window display module supports users to select multiple windows to display on one page, with common window numbers being 2, 3, 4, 6, and 9 windows; it also supports users to select the type of cloud map to display, including displacement cloud map, stress cloud map, and strain cloud map.

[0061] In section 4), the font settings module allows users to batch set the font size and weight of the legends, titles, annotations, and measured fonts displayed in the window.

[0062] In step 5), users can choose whether to output a screenshot of the page according to their needs.

[0063] In step 6), the user can select the maximum and minimum values ​​of the measurement cloud map according to their needs.

[0064] In section 7), the functional module is equipped with the following buttons: "Load Function", "Remove Page", "Confirm Configuration", "Refresh Fonts", "Refresh Notes", "Export Image", "Statistical Results", and "Exit".

[0065] 15. The powertrain suspension bracket structural strength analysis and treatment method according to claim 14, characterized in that the function of each button is:

[0066] The “Load Function” button enables the calling of the functions required in steps 1) to 6; this function must be loaded.

[0067] The “Remove Page” button can delete all pages;

[0068] The “Confirm Configuration” button can be used to run steps 1) to 6).

[0069] The “Refresh Fonts” button can refresh unsatisfactory fonts to make them display better;

[0070] The “Refresh Notes” button refreshes the note content, which is usually the work condition number;

[0071] The "Export Image" button exports the modified screenshot, which will be saved to the model file path for easy viewing and retrieval when writing reports;

[0072] The “Statistical Results” button displays the maximum or minimum values ​​in all windows. The statistical results are saved in an Excel file located in the model file path, making it easy to view and retrieve when writing reports.

[0073] The "Exit" button will exit the current program.

[0074] The present invention adopts the above technical solution, which can greatly improve the efficiency of suspension 28 working condition strength analysis; it can save a lot of time in the header file configuration and post-processing steps of suspension 28 working condition strength analysis, and at the same time avoid analysis errors caused by human error during the analysis process. Attached Figure Description

[0075] The following is a brief description of the content shown in the attached diagram:

[0076] Figure 1 This is a flowchart of the suspension 28 working condition strength analysis of the present invention;

[0077] Figure 2 This is a diagram of the suspended finite element model created using Hypermesh in this invention;

[0078] Figure 3 This is a partial screenshot of the suspension 28 load file extracted by Adams in this invention.

[0079] Figure 4 This is a schematic diagram illustrating the header file configuration for the 28-condition automatic suspension of this invention.

[0080] Figure 5 This is a screenshot of the automated post-processing configuration interface of the present invention;

[0081] Figure 6 Screenshots of the invention's screenshots and statistical results imported into a PowerPoint report; Detailed Implementation

[0082] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0083] like Figures 1 to 6 The technical solution of the present invention is a method for analyzing and processing the structural strength of a powertrain suspension bracket. Specifically, it involves multi-condition structural strength analysis of the powertrain suspension bracket and an automated post-processing method.

[0084] To address the problems and shortcomings of existing technologies and achieve the invention objective of improving the efficiency of powertrain suspension bracket structural strength analysis, the technical solution adopted by this invention is as follows:

[0085] like Figures 1 to 6 As shown, the powertrain suspension bracket structure strength analysis and treatment method of the present invention is as follows:

[0086] Step 1: Based on the CAD geometric model of the suspension bracket, use finite element analysis preprocessing software (Hypermesh) to perform mesh generation, define materials and properties, and generate the model .inp file. The model is as follows: Figure 2 As shown.

[0087] Step 2: Based on the GM global engineering standard GMW14116's 28-condition load calculation method for the suspension, the 28-condition loads are extracted using multibody software (ADAMS), and a load inp file is generated. The generated load file is as follows: Figure 3 As shown.

[0088] Step 3: Based on the .inp files generated in Steps 1 and 2, automatically configure 28 header files; perform calculations using solver software; addressing the tediousness and error-proneness of manual operation in header file configuration during the strength analysis of the 28 suspension conditions, this method develops an automated load configuration plugin based on Tcl / TK. This plugin can run in Hypermesh, automatically configuring the header files for the 28 suspension conditions and automatically generating the Abaqus batch ".bat" file; this is one of the core innovations of this invention.

[0089] Step 4: Based on the solver output files, use post-processing software to batch open the strength calculation result files for the 28-condition suspension load and view the analysis results; this is one of the core aspects of this invention. View the strength calculation results for the 28-condition suspension load in Hyperview and adjust the window display. To address the inefficiency of model loading, contour plot adjustment, data statistics, and report writing in the post-processing of the 28-condition suspension load strength analysis, this invention develops an automated post-processing plugin based on Tcl / TK. This plugin can run in Hyperview. This plugin can realize functions such as model import, window division, font adjustment, data statistics, and screenshot output.

[0090] Step 5: Writing the Analysis Report: Import the screenshots and statistical results from the model file path into PowerPoint to complete the analysis report. This is one of the core aspects of this invention. The report completed using this method can be found in [link to report]. Figure 6 .

[0091] In summary, the key technical points of this invention are:

[0092] 1. Configure the automated program for the 28-condition strength analysis header file of the suspension as described in step three;

[0093] 2. The automated post-processing program for the strength analysis of the suspension under working conditions is as described in steps four and five.

[0094] The software used in each step is as follows:

[0095] In step one, the finite element analysis preprocessing software used is Hypermesh software.

[0096] In step two, the automatic dynamic analysis software for the mechanical system uses ADAMS software.

[0097] In step three, the solver software used is Abaqus, a finite element analysis software for engineering simulation.

[0098] In step four, the post-processing software used is Hyperview, a CAE engineering simulation visualization post-processing software.

[0099] The specific implementation steps of step three are as follows:

[0100] 1) Create a button named "ABAQUS_load_case" using tcl / tk. Clicking the button will take you to the header file configuration interface.

[0101] 2) Use Tcl in conjunction with the Hypermesh API function "hm_getint" to generate a CPU core requirement window; enter the number of CPU cores in this window to allocate the CPUs required for subsequent simulation calculations, and click the "proceed" button to enter the load file selection window;

[0102] 3) Create a file selection box using tcl / tk_getOpenFile, and select the load file and model file in sequence. After selection, the program will automatically configure the header file and batch file.

[0103] The flowchart of this method is shown below. Figure 4 .

[0104] In step four, the following modules are developed using tcl / tk. The specific implementation steps are as follows:

[0105] 1) File selection module;

[0106] 2) Operating condition selection module;

[0107] 3) Window display module;

[0108] 4) Font settings module;

[0109] 5) Screenshot output module;

[0110] 6) Measurement module;

[0111] 7) Functional modules.

[0112] In 1), the file selection module supports users to select “.inp” and “.fem” model files, and also supports users to select the result file type; while “.inp” model files must match “.odb” result files, and “.fem” model files must match “h3d” result files.

[0113] In section 2), the working condition selection module supports users in generating continuous and non-continuous working condition numbers; the program automatically retrieves the working condition files with the corresponding numbers for subsequent batch opening of the model; for example, if 28 working conditions are suspended, this module generates numbers from 1 to 28, and the program will automatically open the working condition files corresponding to these numbers.

[0114] In section 3), the window display module supports users in selecting to display multiple windows on a single page, with common window counts being 2, 3, 4, 6, and 9 windows. It also supports users in selecting the type of cloud map to display, including displacement cloud map, stress cloud map, strain cloud map, etc.

[0115] In section 4), the font settings module allows users to batch set the font size and weight of the legends, titles, annotations, and measured fonts displayed in the window.

[0116] In step 5), users can choose whether to output a screenshot of the page according to their needs.

[0117] In step 6), the user can select the maximum and minimum values ​​of the measurement cloud map according to their needs.

[0118] In section 7), the functional module is equipped with the following buttons: "Load Function", "Remove Page", "Confirm Configuration", "Refresh Fonts", "Refresh Notes", "Export Image", "Statistical Results", and "Exit".

[0119] The functions of each button are:

[0120] The “Load Function” button enables the calling of the functions required in steps 1) to 6; this function must be loaded.

[0121] The “Remove Page” button can delete all pages;

[0122] The “Confirm Configuration” button can be used to run steps 1) to 6).

[0123] The “Refresh Fonts” button can refresh unsatisfactory fonts to make them display better;

[0124] The “Refresh Notes” button refreshes the note content, which is usually the work condition number;

[0125] The "Export Image" button exports the modified screenshot, which will be saved to the model file path for easy viewing and retrieval when writing reports;

[0126] The “Statistical Results” button displays the maximum or minimum values ​​in all windows. The statistical results are saved in an Excel file located in the model file path, making it easy to view and retrieve when writing reports.

[0127] The "Exit" button will exit the current program.

[0128] This method involves the development interface, such as Figure 5 As shown.

[0129] The beneficial effects of this invention are:

[0130] Practice has proven that this invention can significantly improve the efficiency of suspension strength analysis under 28 operating conditions. Taking an engineer as an example, the time required for suspension strength analysis using both conventional methods and the method of this invention is shown in Table 1 below:

[0131] Table 1: Comparison of time consumption between existing methods and the method of the present invention for suspension strength analysis

[0132]

[0133] The comparison in the table above shows that the present invention can save a lot of time in the header file configuration and post-processing steps of the strength analysis of the suspension 28 working conditions, while avoiding analysis errors caused by human error during the analysis process.

[0134] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A method for strength analysis and treatment of powertrain suspension bracket structure, characterized in that: The process of this method is as follows: Step 1: Based on the CAD geometric model of the suspension bracket, use finite element analysis preprocessing software to perform mesh generation, define material properties, and generate the model inp file; Step 2: Based on the globally accepted engineering standard GMW14116, the 28 load conditions of the suspension system are calculated using ADAMS software, and the 28 load conditions are extracted and a load inp file is generated. Step 3: Automatically configure the header files for 28 working conditions of the suspension bracket, and use solver software to perform calculations; Step 4: Based on the result files output by the solver, use post-processing software to open the strength calculation result files of the suspension 28 working condition in batches and view the analysis results; Step 5: Write the analysis report: Import the screenshots and statistical results from the model file path into PowerPoint to complete the analysis report.

2. The powertrain suspension bracket structural strength analysis and treatment method according to claim 1, characterized in that: The specific implementation steps of step three are as follows: 1) Create a button named "ABAQUS_load_case" using tcl / tk. Clicking the button will take you to the header file configuration interface. 2) Use Tcl in conjunction with the HyperMesh API function "hm_getint" to generate a CPU core requirement window; enter the number of CPU cores in this window to allocate the CPUs required for subsequent simulation calculations, and click the "proceed" button to enter the load file selection window; 3) Create a file selection box using tcl / tk_getOpenFile, and select the load file and model file in sequence. After selection, the program will automatically configure the header file and batch file.

3. The powertrain suspension bracket structural strength analysis and treatment method according to claim 1, characterized in that: In step four, the following modules are developed using tcl / tk. The specific implementation steps are as follows: 1) File selection module; 2) Operating condition selection module; 3) Window display module; 4) Font settings module; 5) Screenshot output module; 6) Measurement module; 7) Functional modules.

4. The powertrain suspension bracket structural strength analysis and treatment method according to claim 3, characterized in that: In 1), the file selection module supports users to select ".inp" and ".fem" model files, and also supports users to select the result file type; while ".inp" model files must match ".odb" result files, and ".fem" model files must match "h3d" result files.

5. The powertrain suspension bracket structural strength analysis and treatment method according to claim 3, characterized in that: In section 2), the working condition selection module supports users in generating continuous and non-continuous working condition numbers; the program automatically retrieves the working condition files with the corresponding numbers for subsequent batch opening of the model; for example, if 28 working conditions are suspended, this module generates numbers from 1 to 28, and the program will automatically open the working condition files corresponding to these numbers.

6. The powertrain suspension bracket structural strength analysis and treatment method according to claim 3, characterized in that: In 3), the window display module supports users to select multiple windows to display on one page, with common window numbers being 2, 3, 4, 6, and 9 windows; it also supports users to select the type of cloud map to display, including displacement cloud map, stress cloud map, and strain cloud map.

7. The powertrain suspension bracket structural strength analysis and treatment method according to claim 3, characterized in that: In section 4), the font settings module allows users to batch set the font size and weight of the legends, titles, annotations, and measured fonts displayed in the window.

8. The powertrain suspension bracket structural strength analysis and treatment method according to claim 3, characterized in that: In step 5), users can choose whether to output a screenshot of the page according to their needs.

9. The powertrain suspension bracket structural strength analysis and treatment method according to claim 3, characterized in that: In step 6), the user can select the maximum and minimum values ​​of the measurement cloud map according to their needs.

10. The powertrain suspension bracket structural strength analysis and treatment method according to claim 3, characterized in that: In section 7), the functional module is equipped with the following buttons: "Load Function", "Remove Page", "Confirm Configuration", "Refresh Fonts", "Refresh Notes", "Export Image", "Statistical Results", and "Exit".

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