CN116561900B - Lightweight automobile interior space topology optimization method - Google Patents

Abstract

The invention belongs to the technical field of automobile space optimization. It discloses a lightweight automobile interior space topology optimization method. The method includes the following steps: using three-dimensional modeling software to establish the three-dimensional space structure of the cabin according to the shape and size parameters of the automobile, and determining the topology of the interior space of the automobile. Optimize the space; determine the assembly components to be installed inside the car and generate a menu to be assembled; assign an importance to each assembly component in the menu to be assembled; install each assembly component in the three-dimensional space structure of the cabin, and calculate the remaining space value Tjz in the cabin and the cabin The overall actual weight value Zlz is calculated through formula analysis to obtain the balance coefficient PHxs; according to the size of the balance coefficient PHxs, it is determined whether to optimize the space in the cabin. If the space in the cabin is optimized, take the stressed parts of the car as the endpoint, and separate each The area formed by connecting the endpoints in sequence is divided into y equal parts, and the weight and remaining space of each partition are adjusted within the equally divided area.

Description

A lightweight vehicle interior space topology optimization method

Technical field

The invention belongs to the technical field of automobile space optimization, and specifically relates to a lightweight automobile interior space topology optimization method.

Background technique

Topology optimization is a method of establishing a basic structure composed of a limited number of units in the design space based on given load conditions, constraints and performance indicators, and then determining the removal and retention of units in the design space based on an algorithm. The shape, material, etc. of the assembled components are optimized, and the remaining units constitute the final topology solution, thereby achieving topology optimization. Through topology optimization, the best distribution solution is found in the interior design space of the car.

New energy vehicle design manufacturers adopt lightweight vehicle designs in order to increase the vehicle's cruising range. The reduction in weight will lead to a corresponding reduction in the interior space of the vehicle. It is necessary to optimize the topology of the interior space of the vehicle to ensure the comfort of the vehicle. Nowadays, Some internal space topology optimization of automobiles uses direct and partial reduction of the weight of an assembly component to achieve the purpose of reducing the weight of the vehicle, or directly reduces the volume of an assembly component in the vehicle to reduce weight. Using this topology optimization method, It will cause the overall weight of the car and the uneven distribution of the interior space of the car after the car is assembled later, thus affecting the service life of the car's stressed parts and the comfort of the members riding in the car. Stressed parts such as wheels or other parts used to connect the car and the wheels When the connecting parts have uneven force-bearing parts, the degree of wear will also be inconsistent, which will reduce the stability of the car during driving.

In view of this, the present invention proposes a lightweight vehicle interior space topology optimization method.

Contents of the invention

The present invention aims to solve the above technical problems and provide a lightweight vehicle interior space topology optimization method.

The technical solution of the present invention is: a lightweight vehicle interior space topology optimization method, which method includes the following steps:

Step 1: Use three-dimensional modeling software to establish the three-dimensional space structure of the car based on the shape and size parameters of the car, and determine the topology optimization space of the space inside the car;

Step 2: Determine the components to be installed and assembled inside the car and generate a menu to be assembled;

Step 3: Match n production materials for each assembly component in the assembly menu, where n is an integer greater than 1;

Step 4: Assign an importance value to each assembly component in the assembly menu. The greater the importance value, the more important the function of the assembly component is;

Step 5: Record the information of each assembly component in the menu to be assembled. The assembly component information includes the volume, material and weight of the assembly component corresponding to the material;

Step 6: Install each assembly component in the three-dimensional space structure of the carriage, calculate the remaining space value Tjz in the carriage and the overall actual weight value Zlz of the carriage, and calculate the balance coefficient PHxs through formula analysis;

Step 7. Based on the size of the balance coefficient PHxs, determine whether to optimize the space in the cabin. If the space in the cabin is to be optimized, take the stressed parts of the car as the endpoints, and the number of endpoints is greater than or equal to three, and connect each endpoint in sequence to form an area. Divide y into equal parts, and adjust the weight and remaining space of each partition within the equally divided area.

Preferably, in the above, the balance coefficient PHxs and the balance thresholds PHmin and PHmax are compared and analyzed;

If PHmin<PHxs<PHmax, the space in the carriage will not be optimized;

If PHxs ≤ PHmin or PHxs ≥ PHmax, the interior of the carriage will be optimized.

Preferably, in the above, there are four stressed components of the automobile. The steering wheel installation area at the front of the automobile is the first end point and the second end point, and the two most extreme wheels at the rear of the automobile are installed. The area is the third endpoint and the fourth endpoint, and the area formed by the first endpoint, the second endpoint, the third endpoint and the fourth endpoint is divided into y equally divided areas; y=4.

Preferably, in the above, the specific method of adjusting the weight of each partition in step seven includes: comparing the absolute value Xmz of the difference between the overall actual weight value Zlz of the carriage and the standard weight value Mbz of the carriage with the weight error value Mwx;

If Xmz≤Mwx, the overall weight of the carriage will not be optimized;

If For the weight error value, replace the materials of some assembly parts in four equally divided areas until Fmbz-M<Fmwx, and the optimization is completed.

Preferably, in the above, the material replacement sequence of the assembly parts is to replace the corresponding materials of the assembly parts in the order of increasing importance. When the material replacement principle is used, the material of heavy quality is replaced by the material of light quality.

Preferably, in the above, the specific method of adjusting the remaining space of each partition in the carriage in step 7 includes: calculating the remaining space value K of each partition, and calculating the difference between the remaining space value Tjz in the carriage and the standard space value Tbz in the carriage. The value Txz is compared with the space error value Twz. If Txz≤Twz, the remaining space in the carriage will not be optimized;

If Txz>Twz, calculate the remaining space value M of each partition, according to the formula: Tbz/4=Ftbz, Twz/4=Ftwz, Ftbz is the standard value of the remaining space of each equally divided area in the carriage, and Ftwz is the remaining space value of each equal area in the carriage. The residual space error value of the divided areas is used to reduce the volume of the partially assembled components in the four equally divided areas until Ftbz-K<Fmwx, and the optimization is completed.

Preferably, in the above, the volume replacement sequence of the assembly components is: reducing the volume of the corresponding assembly components in the order of decreasing volume of the assembly components and in the order of increasing importance assigned to the assembly components.

Due to the adoption of the above technical solution, the beneficial effects of the present invention are:

The lightweight vehicle internal space topology optimization method of the present invention takes the steering wheel installation area at the front of the vehicle as the first endpoint and the second endpoint, and then uses the installation area of the two rear wheels at the rear of the vehicle as the third endpoint and the fourth endpoint. The area formed by the first endpoint, the second endpoint, the third endpoint and the fourth endpoint is divided into four equally divided areas. In this way, when optimizing the lightweight space inside the car, the weight in the divided areas is simultaneously optimized, so that the overall vehicle The weight distribution is more even and symmetrical. After the car is assembled in the later stage, the pressure on each wheel will be within the pressure error unit, which improves the overall balance of the car and ensures the stability of the car during driving;

The remaining space in the equally divided areas is simultaneously optimized to make the overall spatial distribution in the car more even, ensuring that the occupants have appropriate space for activities in any area in the car, and improving the overall riding comfort of the members in the car.

Description of the drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore do not It should be regarded as a limitation of the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without exerting creative efforts.

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the provided drawings without exerting creative efforts.

Figure 1 is a schematic diagram of a lightweight vehicle interior space topology optimization method in an embodiment of the present invention;

Detailed ways

The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Example

As shown in Figure 1, this embodiment describes a lightweight vehicle interior space topology optimization method. The method includes:

Use three-dimensional modeling software to establish the three-dimensional space structure of the cabin based on the shape and size parameters of the car, and determine the topology optimization space of the space inside the car;

Determine the assembly components installed inside the car and generate a menu to be assembled. The assembly components in the menu to be assembled can be freely added or deleted by the optimizer according to the car design plan;

Each assembly component in the assembly menu is matched with n production materials, where n is an integer greater than 1;

Assign an importance value to each assembly component in the to-be-assembled menu. The greater the importance value, the more important the function of the assembly component. For example, the value assigned to the car seat frame should be greater than the car seat heating component. When the assembly is completed If the weight is excessive, priority will be given to replacing the materials or deleting the assembly parts with smaller values.

Record the information of each assembly component in the menu to be assembled. The assembly component information includes the volume, material and weight of the assembly component corresponding to the material.

Install each assembly component in the three-dimensional space structure of the carriage, calculate the remaining space value Tjz in the carriage and the overall actual weight value Zlz of the carriage, and calculate the balance coefficient PHxs through PHxs=ɑ1*Tjz+ɑ2*Zlz, where ɑ1 and ɑ2 are both Proportional coefficient, and ɑ1>ɑ2>0; it should be noted that the balance coefficient is a value that reflects the suitability of the space in the car. The larger the value, the larger the space and the heavier the weight, and vice versa. The value of Too large or too small will affect the driver's driving comfort; compare and analyze the balance coefficient with the balance thresholds PHmin and PHmax;

If PHmin<PHxs<PHmax, the space in the carriage will not be optimized;

If PHxs≤PHmin or PHxs≥PHmax, optimize the cabin and compare the absolute value Xmz of the difference between the overall actual weight value Zlz of the cabin and the standard weight value Mbz of the cabin with the weight error value Mwx. If Xmz≤Mwx, Then the overall weight of the carriage will not be optimized;

If value, Fmwx is the weight error value of the four equally divided areas in the carriage, and the materials of some assembly parts in the four equally divided areas are replaced until Fmbz-M < Fmwx, and the optimization is completed.

The above-mentioned assembly component material replacement sequence replaces the corresponding assembly component materials in the order of increasing importance. The material replacement principle is to replace heavy-quality materials with light-quality materials.

For the above four equally divided areas, the steering wheel installation area at the front of the car is the first endpoint and the second endpoint, and the two rear wheel installation areas at the rear of the car are the third endpoint and the fourth endpoint. The first endpoint, The area formed by the second endpoint, the third endpoint and the fourth endpoint is divided into four equally divided areas. In this way, when optimizing the lightweight space inside the car, the weight in the divided areas is simultaneously optimized, making the overall weight distribution of the car more even. Symmetrically, after the car is assembled in the later stage, the pressure on each wheel will be within the pressure error unit, which improves the overall balance of the car and ensures the stability of the car during driving.

Calculate the remaining space value K of each partition, and compare the absolute value Txz of the difference between the remaining space value Tjz in the carriage and the standard space value Tbz in the carriage with the space error value Twz. If Txz ≤ Twz, the remaining space in the carriage will not be optimized;

If Txz>Twz, divide the carriage into 4 equally divided areas, and calculate the remaining space value M of each partition. According to the formula: Tbz/4=Ftbz, Twz/4=Ftwz, Ftbz is the remaining space of each equal area in the carriage. The space standard value, Ftwz is the remaining space error value of each equally divided area in the carriage, and the volume of some assembled components in the four equally divided areas is reduced until Ftbz-K < Fmwx, and the optimization is completed.

The order of volume replacement of the above-mentioned assembly parts is: reduce the volume of the corresponding assembly parts in the order of decreasing volume of the assembly parts and increasing order of the importance assigned to the assembly parts, that is, priority is given to assembly parts with larger volumes and smaller importance assignments. Perform volume reduction.

When optimizing the lightweight space in the car, the remaining space in the equally divided areas is simultaneously optimized to make the overall spatial distribution in the car more even, ensuring that the occupants have appropriate activity space in any area in the car, and improving the overall ride of the members in the car. Comfort.

The above formulas are all obtained by collecting a large amount of data for software simulation and are selected to be close to the real values. The coefficients in the formula are set by those skilled in the art according to the actual situation.

For example: the formula PHxs=ɑ1*Tjz+ɑ2*Zlz; technicians in the field collect automobile design parameter sample data and set corresponding proportional coefficients for each set of sample data; substitute the set coefficients and collected parameter sample data into the formula , any two formulas form a system of linear equations of two variables, filter the calculated coefficients and take the average to obtain ɑ1, and ɑ2.

The size of the coefficient is a specific value obtained by quantifying each parameter to facilitate subsequent comparisons. The size of the coefficient depends on the amount of sample data and the preliminary setting of the corresponding proportion coefficient for each set of sample data by those skilled in the art. ;As long as it does not affect the proportional relationship between the parameter and the quantized value.

In the description of this specification, reference to the terms "one embodiment," "example," "specific example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one aspect of the invention. in an embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are only intended to help illustrate the invention. The preferred embodiments do not describe all details, nor do they limit the invention to specific implementations. Obviously, many modifications and variations are possible in light of the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can better understand and utilize the present invention. The invention is limited only by the claims and their full scope and equivalents.

Claims (5)

1. A method for optimizing space topology in a lightweight automotive vehicle, the method comprising the steps of:

firstly, establishing a carriage three-dimensional space structure by utilizing three-dimensional modeling software according to automobile shape and size parameters, and determining a topology optimization space of an automobile interior space;

step two, determining an assembly part installed in the automobile and generating a menu to be assembled;

step three, matching n manufacturing materials with each assembly part in the menu to be assembled, wherein n is an integer greater than 1;

step four, carrying out importance degree assignment on each assembly part in the menu to be assembled, wherein the greater the importance degree assignment value is, the more important the assembly part shows the function;

step five, recording information of each assembly part in a menu to be assembled, wherein the assembly part information comprises the volume, the material and the weight corresponding to the material assembly part of the assembly part;

step six, installing each assembly part in a three-dimensional space structure of a carriage, calculating a residual space value Tjz in the carriage and an integral actual weight value Zlz of the carriage, and calculating to obtain a balance coefficient PHxs through formulation analysis;

step seven, judging whether to optimize the space in the carriage according to the size of the balance coefficient PHxs, if so, taking the automobile stress part as the end points, wherein the number of the end points is more than or equal to three, dividing the area formed by sequentially connecting the end points into equal parts of y, and adjusting the weight and the residual space of each subarea in the equal part area;

the specific method for adjusting the weight of each partition in the seventh step comprises the following steps: comparing the absolute value Xmz of the difference between the overall actual weight value Zlz of the carriage and the standard weight value Mbz of the carriage with the weight error value Mwx;

if Xmz is less than or equal to Mwx, the whole weight of the carriage is not optimized;

if Xmz > Mwx, calculate each partition weight value M according to the formula: mbz/4=Fmbz, mwx/4=Fbx, wherein Fmbz is the weight standard value of each equal division area in the carriage, fbx is the weight error value of each equal division area in the carriage, and the materials of the part assembly parts of the 4 equal division areas are replaced until Fmbz-M < Fbx, and the optimization is completed;

and the material replacement sequence of the assembly parts replaces the corresponding material of the assembly parts in the sequence of increasing importance assignment, and when the material is replaced according to the material replacement principle, the material with heavy weight is replaced by the material with light weight.

2. The method for optimizing the spatial topology in a lightweight automobile according to claim 1, wherein the balance coefficient PHxs is compared with a balance threshold PHmin and PHmax for analysis;

if PHmin < PHxs < PHmax, the space in the carriage is not optimized;

if PHxs is less than or equal to PHmin or PHxs is more than or equal to PHmax, optimizing the carriage.

3. The method for optimizing the space topology in the lightweight automobile according to claim 2, wherein the number of the automobile stress parts is 4, the automobile stress parts are a first end point and a second end point, the two wheel installation areas at the rearmost end of the tail part of the automobile are a third end point and a fourth end point, and the area formed by surrounding the first end point, the second end point, the third end point and the fourth end point is divided into y equally divided areas; y=4.

4. The method for optimizing the space topology in a lightweight automobile according to claim 1, wherein the specific method for adjusting the remaining space of each subarea in the compartment in the step seven comprises the following steps: calculating a residual space value K of each subarea, comparing the absolute value Txz of the difference between the residual space value Tjz in the carriage and the standard space value Tbz of the carriage with a space error value Twz, and if Txz is less than or equal to Twz, not optimizing the residual space of the carriage;

if Txz > Twz, the remaining space value M of each partition is calculated according to the formula: tbz/4=ftbz, twz/4=ftwz, ftbz is a standard value of the residual space of each equal division area in the carriage, ftwz is a residual space error value of each equal division area in the carriage, and the volume of the part assembly parts of the 4 equal division areas is reduced until Ftbz-K < Fmwx, and the optimization is completed.

5. The method for optimizing the spatial topology in a lightweight automotive vehicle according to claim 4, wherein the order of volume replacement of the assembled parts is: and (3) reducing the volume of the corresponding assembly parts in the descending order of the volumes of the assembly parts and the ascending order of the importance assignment of the assembly parts.