KR100637842B1 - The Design Method For Motor Sports Cart Frame Using Target Model And Computer Aided Engineering - Google Patents

Abstract

The present invention relates to a design method of a motor sports type cart frame using a reference model and analytical techniques, and establishes a process of design, manufacturing base technology through the structure, frame design and manufacturing of the cart, which is entirely dependent on foreign imports. And localize it, and analyze the structure, durability, and collision of the cart frame through an analytical technique (CAE) to measure the stiffness and strength of the frame and reflect it in the design to build a more verified design system and build the cart. The purpose is to make the frame. To this end, after selecting a benchmarking model, the reference model is determined by synthesizing the results of measuring the structure and dimensions of the benchmarking model, and determining the reference model for evaluating the performance of the selected benchmarking model and evaluating the performance of the benchmarking model (S100); A reference model analysis step (S200) of analyzing the determined steering characteristics, stiffness, durability, and collision characteristics of the reference model; After modeling the frame of the model to be produced by reflecting the analysis result of the reference model, the steering characteristic, stiffness, durability, and collision analysis are performed to analyze and compare the model to be produced with the analysis result of the reference model (S300); A production model production step (S400) of producing a frame of the production model after creating a drawing of the production model by reflecting the comparison result of the analysis of the reference model and the model to be produced; It comprises a performance evaluation and comparison step (S500) of the production model to compare the performance evaluation of the evaluated reference model after evaluating the driving performance of the produced production model.

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Description

The design method for motor sports cart frame using target model and computer aided engineering             

1 is a general configuration diagram of a conventional cart.

Figure 2 is a step-by-step flow chart of a design method of a motor sports cart frame using a reference model and analytical techniques according to the present invention.

3A and 3B are state diagrams of frames showing the results of dynamic analysis of a reference model according to the present invention.

4 is a state diagram of a frame showing the static analysis result of the reference model according to the present invention.

Figure 5 is a state diagram for measuring the durability of the reference model frame according to the present invention.

Figure 6a, Figure 6b is a state diagram of the frame showing the durability analysis results of the reference model according to the present invention.

7 is a state diagram for evaluating collision analysis of a reference model frame according to the present invention.

8A and 8B are graphs showing collision analysis results of a reference model according to the present invention.

9 is a frame state diagram of an improved production model from a reference model and a reference model according to the present invention.

Figure 10 is a state diagram of the entire production model of the cart including the model with the frame changed according to the present invention.

11A and 11B are graphs comparing collision changes between a reference model and a production model on the front and side surfaces according to the present invention.

12 is a flow chart showing the production process of the production model according to the present invention.

13 is a graph comparing actual differences between a production model and a reference model according to the present invention.

* Explanation of symbols for the main parts of the drawing *

S100: Determining the reference model and evaluating the performance of the benchmarking model
S200: Reference model analysis step

S300: Analysis and comparison step of the model to be produced

S400: Production model production stage
S500: Performance evaluation and comparison of production model

The present invention relates to a method of designing a motor sports type cart frame using a reference model and analytical techniques, and more specifically, a structure, frame design and production base through frame design and production of a cart frame that relies entirely on foreign imports. By establishing and localizing the process of technology, the rigidity and durability of the cart frame through analytical technique (CAE), and the collision analysis are used to measure the stiffness and strength of the frame and reflect it in the design to build a more verified design system. Based on this, it relates to a design method of a motor sports type cart using a reference model and an analytical technique for manufacturing a cart frame.

In addition to the Olympics and the World Cup, motor sports are the world's top three world sports, which are gaining the most popular popularity with endless speed competition and brilliant driving technology.

Therefore, the sports car used here must have the best engine performance for high-speed driving and the best suspension characteristics for perfect cornering during sudden turning. As a result, global automakers are actively participating in the development of sports cars, thinking of it as a stage for testing and promoting their automobile technology.

In addition, among the sports cars developed, the cart is the lowest grade car model in motor sports, and as shown in FIG. 1, the basic front/side bumper 110, frame 120, suspension device 130, braking device 140, steering It consists of a mechanism of a simple structure such as the device 150, the seat 160, the power transmission meter 170, and the drive shaft/tire 180.

In addition, the cart is a one-seater, and the ground clearance is low, so you can feel the maximum sense of speed, and the power transmission system uses a direct chain without a differential, and the power is connected to the drive shaft, which is significantly different from other racing or general vehicles.

In addition, compared to the top-tier F-1, 2, and 3, the size of the car is small and the structure or engine has a very rudimentary form, so it can be regarded as a niche area mainly involving small and medium-sized auto parts manufacturers rather than the world's largest automakers. .

However, in order to determine the driving performance of the car with only the body and other basic structures, it is necessary to develop a high-level car body manufacturing technology that is second to that of a higher-class car. It is very meaningful.

In addition, the cart has a technically difficult problem because the frame made of steel and aluminum is equipped with an engine, seat, wheel, etc., or the movement characteristics of the vehicle must be controlled with this frame.

Also, in recent years, the cart, which is the beginning of motor sports, has begun to be revitalized around clubs, and the international track of Cartville was completed in April 2001 in Hwaseong, Gyeonggi-do in addition to the Yongin Speedway and Gyeongsangnam-do Changwon International Road Stadium. The popularization of is gradually forming.

In addition, as the report sports field is rapidly revitalized due to the expansion of the 5-day work week in the future, the interest in carts is greatly increased, so it is urgently necessary to build a system for domestic design and manufacturing technology of carts that rely on all foreign imports.

Therefore, the present invention was developed in view of such circumstances, and the present invention designs and manufactures a cart frame structure and material through research on vehicle movement characteristics, and manufactures a completed cart based on the manufactured vehicle body. The manufactured cart is intended to provide a design method of a motor sports type cart frame using a reference model and analytical techniques to compare and evaluate performance with existing carts through driving tests.                         

In addition, it aims to establish an efficient development system by establishing the process of design and production-based technology through the design and fabrication of the structure and frame of the cart, which relies on all foreign imports.

In addition, the rigidity, durability, and collision analysis of the cart frame through an analytical technique (CAE) are measured to measure the frame's rigidity and strength, and this is reflected in the design to build a more verified design system and build the cart frame based on this. Another object is to provide a method for designing a motor sports type cart frame using a reference model and analytical techniques.

In order to achieve the above object, a design method of a motor sports type cart frame utilizing the reference model and analytical techniques of the present invention is benchmarked by a conventional cart frame, and a reference model is determined and produced by reflecting the analysis results of the reference model In the method of designing the model, after selecting the benchmarking model, the reference model is determined by synthesizing the results of measuring the structure and dimensions of the benchmarking model, determining the reference model to evaluate the performance of the selected benchmarking model, and evaluating the performance of the benchmarking model. Step S100; A reference model analysis step (S200) of analyzing the determined steering characteristics, stiffness, durability, and collision characteristics of the reference model; After modeling the frame of the model to be produced by reflecting the analysis result of the reference model, the steering characteristic, stiffness, durability, and collision analysis are performed to analyze and compare the model to be produced with the analysis result of the reference model (S300); A production model production step (S400) of producing a frame of the production model after creating a drawing of the production model by reflecting the comparison result of the analysis of the reference model and the model to be produced; After evaluating the driving performance of the fabricated production model, the performance evaluation and comparison step (S500) of the production model is compared with the performance evaluation of the evaluated reference model, but the reference model analysis step (S200) or production is performed. In the model analysis and comparison step (S300), dynamic stiffness analysis evaluates the structural torsional and bending modes for the frequency of the frame in the free-free boundary condition, and static stiffness analysis is a unit of XYZ direction of one point. It is characterized by analyzing the stiffness by applying displacement to the remaining one point on one side in the condition that the rotational degrees of freedom of the other three points are free with respect to the displacement amount.

The durability analysis in the reference model analysis step (S200) or the production model analysis and comparison step (S300) is characterized by measuring the durability by shaking a certain angle in one direction of the other one point while the six degrees of freedom of the other three points are constrained. do.

In the reference model analysis step (S200) or the production model analysis and comparison step (S300), a real vehicle collision test is performed by the finite element method, but it is characterized by simulating a situation in which the front and side surfaces of the frame collide against the wall at a constant speed. .

In the analysis and comparison step of the production model (S300), the reference model is modified based on the analysis result of the reference model analysis step (S200) to modify the 3D model of the model to be actually produced and to increase the performance in frontal collision. It is characterized by extending the diameter of the frame to favor dynamic stiffness and durability and collision while expanding resources to have an advantageous structure in terms of static rigidity and durability.

In the production model production step (S400), the surface to be welded is cut after the pipe for the frame of the production model is cut and the pipe is bent, the second welding is performed after the first temporary welding, and the end of the pipe is processed to produce the frame. It is characterized by.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to exemplary drawings.

As shown in FIG. 2, the design method of the motorsport type cart frame using the reference model and the analytical technique according to the present invention, after determining the reference model by selecting a benchmark model, analyzes the stiffness, durability, and collision of the reference model Then, after modeling the model to be produced, analyze its stiffness, durability, and collision, and compare it with the reference model to produce a production model that reflects the results of the analysis comparison between the reference model and the model to be produced. It is made to design the cart frame of the production model through the process of comparative evaluation of performance. 2 shows a step-by-step flowchart of a design method of a motor sports type cart frame using a reference model and analytical techniques.

Therefore, the first step is to determine the reference model and evaluate the performance of the benchmarking model (S100). After selecting the benchmarking model, the results of measuring the structure and dimensions of the benchmarking model are combined to determine the reference model, and the performance of the selected benchmarking model is evaluated. It is a step.

Benchmarking model refers to one or more models selected from models preferred by consumers among conventional carts, and may be selected for each component such as a frame, an engine, and the like. In the present invention, the benchmarking model selected the cart frame of Lakama, Italy, which preoccupied much of the supply of the competition cart, and the cart engine for 100cc sprint of Iame.

The reference model is determined by measuring the structure and dimensions of the cart frame selected as the benchmarking model. The geometric data is measured using a three-dimensional measuring machine with a benchmarking model incorporating Italy's 100cc two-stroke engine in a sprint cart frame for advanced users of Lakama, Italy. As shown in Table 1, the important resources and steering characteristics of the frame of the benchmarking model were measured. The reason for measuring the important resources and steering characteristics of the frame of the benchmarking model is to model the virtual reference model by synthesizing the merits of each measuring element after measuring the characteristics of the benchmarking model.

Benchmarking Model Resources Frame weight Camber angle Caster angle King-Pin Inclination Angle Column axial angle 14.7㎏ 0.63° 14° 10.35° 50° Column length Wheel base Front wheel tread Rear wheel tread Toe angle 545 mm 1045mm (973mm) (1111mm) 2°

Among the data in Table 1, the front wheel tread and the rear wheel tread are variable according to the position when the front/rear wheel is attached, and the measurements in Table 1 are the basic reference dimensions in the actual vehicle test, and the toe angle is also steer The length of the tie rod can be adjusted from, and the above measurements are also basic reference dimensions.

The structure and dimensions of the benchmarking model are measured, and then the 3D modeling and the reference model are determined based on the measurement results of the elements that have advantages among the benchmarking models. At this time, the geometric data of the benchmarking model measured by the 3D measuring machine is used and commercial programs are used. Cart frame and parts are modeled using Unigraphics-NX.

Here, the 3D measuring device detects the 3D position value (XYZ) in space at the moment the contact sensor comes into contact with the object, and obtains the desired measurement value through calculation processing. A non-contact, three-dimensional system that detects the position value (XYZ) from a number of pixels and the camera's pixels and obtains the measured value through the desired calculation processing.

There is a measuring instrument. Unigraphics NX is a geometric modeler that shows curves, faces, solids, and unified concepts.

The same model is applied to the camber angle, caster angle, and kingpin inclination angle, and the result of stiffness, durability, and collision analysis is comprehensively reflected using a three-dimensional model to determine the reference model. Here, the reference model is a model made virtually as a reference for producing a production model by synthesizing the results of analyzing one or more benchmarking models. The reference model is modeled by a 3D CAD modeling technique by taking advantage of the benchmarking model.
In the detailed description of the present invention, the description of the benchmarking model, the reference model, and the production model will mainly focus on the cart frame. For reference, in the reference model, the rest of the parts except the frame are replaced with the parts of the benchmarking model. Here, the frame is a structure made of a pipe as shown in FIGS. 3A to 7 and 9, and is a structure in which a handle, an engine, a fuel tank, and a wheel are mounted by forming a main skeleton of a cart.

Meanwhile, in order to compare and analyze the performance of the production model, which will be described later, the actual performance of the benchmarking model is evaluated. The evaluation of the actual performance of the benchmarking model is necessary to compare the performance of the production model, so it can be done before comparing with the performance of the production model. The comparison of the performance of the benchmarking model and the production model is made after comparing the analysis result of the reference model with the analysis result of the production model. Since the reference model is a virtual model, the performance of the actual benchmarking model and the performance of the production model are compared.
In one embodiment of the present invention, the actual vehicle performance evaluation was carried out at the circuit of Cartville, an international automobile stadium located in Hwaseong-si, Gyeonggi-do, Republic of Korea. It consists of four corners.

The actual vehicle performance evaluation is based on the lap time, and as shown in Table 2, the total time to turn 15 laps is recorded.

Lap time evaluation Lap One 2 3 4 5 6 7 8 Total Time Time 28:32 28:12 27:34 27:44 27:32 27:45 27:55 27:12 Lap 9 10 11 12 13 14 15 6:24:34 Time 26:48 26:32 26:58 26:40 30:45 27:58 27:12

Among the lap time results in Table 2, 13 laps are excluded from the total lap time because the time was exceeded by derailing the road surface while attempting an excessive draft turn.

The next step is a reference model analysis step (S200), in which the steering characteristics, stiffness, durability, and collision analysis of the reference model determined in the previous step (S100) are performed.

First, the steering characteristics are analyzed using commercial packages such as Adams/View. Here, Adamsview helps Adams to effectively construct a mechanical system model using various fields and constraints such as joining and moving, and complete elements such as bush, sping, damper, and tire. It is a company program.

The tool for the analysis of the steering characteristics used in the present invention is sufficient as an analytical tool capable of constructing a mechanical system model. The steering characteristic analysis tool can verify the kinematic and dynamic structure of the reference model, add a flexible body model to the rigid system model, and read the CAD geometry or nonlinear element test data required for the model's sophistication from the outside. However, it is desirable to have a function that can perform expression as a parameter of the model for design.

Stiffness analysis can be divided into dynamic stiffness analysis and static stiffness analysis. Looking at the dynamic stiffness analysis first, the dynamic stiffness analysis is also referred to as vibration analysis, and is generally a method of evaluating the primary torsional and bending modes for the resonance frequency and mode of the frame. Put it in a free-free state and grasp the aspect of the structural mode.

3A and 3B show the state of a frame indicating a torsional or bending mode as a result of dynamic analysis of a reference model. Table 3 shows the results of the dynamic stiffness analysis of the reference model.

Dynamic stiffness analysis results Mode Shape Natural Frequency(Hz) Modal Analysis Results 1st Torsion Mode 47.6 1st Bending Mode 57.6

Looking at the static stiffness analysis, the static stiffness analysis is an analysis performed to calculate the stiffness according to the unit displacement amount of one point in the XYZ direction as shown in FIG. 4, and the other three points (A, B, C) It is a method of performing stiffness analysis in a state in which a displacement of 1 mm is applied to one point (O) on one side while setting the degree of freedom for rotation. The unit displacement amount refers to a displacement amount with respect to 1 mm. 4 shows the state of the frame representing the static analysis result of the reference model, and Table 4 shows the static stiffness analysis result of the reference model.

Looking at the durability analysis, the durability analysis is performed by shaking one point (O) by 2° in the Z direction by 2° while the other three points (A, B, C) are constrained to 6 degrees of freedom as shown in FIG. 5. This is an analysis to measure, and the frame of the reference model is modeled as a shell element.
Here, 6 degrees of freedom is a question of whether to perform linear motion and rotational motion in three-dimensional X, Y, and Z directions, respectively. If a linear motion or a rotation motion is possible, there is a degree of freedom, and if a linear motion or a rotation motion is not possible, the state is constrained. Suppose, for example, that there is one straight member (not shown), one end of the straight member ('ga') is fixed to the fixed end, and the other end of the straight member ('b') is in a free state where it is not fixed anywhere. If so, the'a' side of this straight member is fixed to the fixed end, so it is not possible to perform linear motion or rotational motion, so it is constrained for 6 degrees of freedom. Since the'I' side of the linear member is free, it is possible to perform linear motion or rotational motion, so there is a degree of freedom for 6 degrees of freedom.
Therefore, the state constrained to six degrees of freedom is a state in which both linear motion and rotational motion in the three-dimensional X, Y, and Z directions are not possible. The six degrees of freedom is used in the analysis technique to model the product's surroundings close to the actual situation. This is because it is possible to increase the reliability of the analysis by modeling how the force is input from the outside of the product and how the joints of the product are connected to the real world.
FIG. 5 is a state in which the durability of the reference model frame is measured. The left drawing of FIG. 5 shows the case of shaking the frame by 2°, and the right drawing of FIG. 5 shows the other point O being constrained by 6 degrees of freedom.

In addition, as shown in Table 5 and FIGS. 6A and 6B, the fatigue strength analysis results measured about 100,000 cycles on the front wheel side and about 600,000 cycles on the rear wheel side. 6A shows the results of analyzing the durability of the frame front wheel side of the reference model, and FIG. 6B shows the results of analyzing the durability of the frame rear wheel side of the reference model.

Durability analysis result Mount Point Frt LH Point Frt RH Point Rr LH Point Rr RH Point Fatigue Life 115,000 108,000 773.,000 336,000

Looking at the collision analysis, the collision analysis is an analysis that must be performed on a cart frame with many collision elements during a game by simulating a real vehicle collision test through computer analysis using finite element analysis. The collision analysis method is a method of simulating a situation in which a collision occurs with a rigid wall at a speed of 40 km/h from the front and side of the frame of the reference model as shown in FIG. 7. 7 is a state in which the collision analysis of the reference model frame is evaluated, the left side view of FIG. 7 represents the front state of the frame, and the right side view of FIG. 7 represents the state on the side of the frame.

Here, Finite Element Analysis (FEA) represents an infinite number of support points in a structure as a finite number of discretized positions using nodes, and uses a block called Element that makes an organic relationship between them. This is an analysis that obtains the desired value through numerical approximation at any point in the overall structure or the actual physical system.

In addition, FIG. 8A shows a force-displacement (F-D) diagram obtained by collision analysis on the front side of the reference model frame, and FIG. 8B shows a force-displacement (F-D) diagram obtained by collision analysis on the side surface of the reference model frame.

In the case of a frontal collision, according to the F-D diagram of FIG. 8A, it can be confirmed that severe bending occurs in the early stage of the collision and then severe bending occurs again in the second half. In the case of a side impact, according to the F-D diagram of FIG. 8B, it can be seen that the bending starts to gradually start from the beginning of the collision and the bending progresses to a certain degree. Therefore, looking at the results of the collision between the front and the side, it can be seen that the bending amount occurs more easily than the lower weight during the side impact.

Analysis result analysis CAE Result Remark Dynamic stiffness analysis 1st Torsion Mode: 47.6 Hz 1st Bending Mode: 57.6 Hz Engine excitation frequency 20-30Hz and non-combustible standard more than 47.6Hz Static stiffness analysis See Table 4 Spec. conforming to standard stiffness Durability analysis Max. 700,000 Cycle Min. 108,000 Cycle Minimum of 100,000 Cycles Collision analysis Frontal collision: 62,000N Side collision: 130,000N The frame model needs to be changed to improve the performance of the frontal collision.
CAE stands for Computer Aided Engeering.

The next step is the analysis and comparison of the model to be produced (S300), modeling the frame of the model to be produced by combining the analysis results of the reference model analyzed in the previous step (S200) and steering characteristics of the modeled frame of the model to be produced. , After analyzing the stiffness, durability, and collision, it is a step of comparative analysis with the analysis results of the reference model analyzed in the previous step (S200). The model to be produced here is a model before the actual production and is a model modeled by 3D CAD modeling technique by reflecting the analysis results of the reference model.

Based on the analysis results in Table 6, the reference model is modified to perform 3D modeling of the model to be actually manufactured. Referring to the right side view of FIG. 9, as shown in the remark field of the collision analysis result in Table 6, the side support 11 is integrally modeled to improve the performance during a frontal collision, and the structure is advantageous in terms of static rigidity and durability. 20 mm between the side support 11 positioned between the wheel support 12 and the seat support 13 in order to have a, and the frame was extended to Ø32 to favor dynamic rigidity and durability and collision. The left drawing of FIG. 9 shows the frame of the reference model, and the right drawing of FIG. 9 shows the frame of the production model improved from the reference model.

10 shows the entire production model of the cart including the model with the frame changed.

In addition, the steering characteristic analysis for modeling of the model to be produced is performed through the same Adams view as the reference model, and the static/dynamic stiffness analysis, durability analysis, and collision analysis for the modeling of the model to be produced are the same as the reference model. FEM). Table 7 compares the analysis results of the production model and the reference model.

Comparison of dynamic stiffness/static stiffness/durability analysis results Dynamic stiffness analysis Shape Mode Natural Frequency(Hz) Remark Production model Reference model 1st Torsion Mode1 48.9 47.6 3% ↑ 2st Bending Mode 57.8 57.6 0.3% ↑ Static stiffness analysis Analysis Point Stiffness(N/mm) Remark Production model Reference model Frt LH Point For/Rear 1,792 1,687 6%↑ Lateral 529 499 6% ↓ Vertical 28 26 8%↑ Frt RH Point For/Rear 1,803 1,697 6% ↑ Lateral 585 599 5%↑ Vertical 28 26 8% ↑ Rr LH Point For/Rear 569 567 0.4%↑ Lateral 812 842 4% ↓ Vertical 28 26 8% ↑ Rr RH Point For/Rear 637 628 1.4%↓ Lateral 907 939 3%↑ Vertical 29 27 7%↑ Durability analysis Analysis Point Cycles Remark Production model Reference model Frt LH Point 107,930 115,000 6%↓ Frt RH Point 107,930 108,000 Rear LH Point 804,660 773,000 4%↑ Rear RH Point 336,130 336,000

Looking at the comparison results of dynamic/static/durability analysis in Table 7, first, in the case of dynamic stiffness analysis, it can be confirmed that the frequency of the production model is higher than the frequency of the reference model, which means that the overall stiffness is high and the durability is excellent and vibration It implies this low vibration.

 In addition, in the case of static stiffness analysis, it can be confirmed that the production model is superior to the reference model in the analysis except for the lateral direction, and in the durability analysis, it can be confirmed that the fatigue value exceeding 100,000 cycles that we targeted in the production model is measured.

In addition, as shown in FIGS. 11A and 11B, when comparing the results of the collision analysis between the reference model and the production model, first, in the case of a frontal collision, in the FD diagram of FIG. 11A, the production model is initially deformed in a similar manner to the reference model. Later, it can be seen that a crash characteristic larger than the reference model appears. In the case of side collision, it was confirmed from the FD diagram of FIG. 11B that the production model was not significantly different from the reference model.
FIG. 11A is a graph showing a comparison of collision changes between a reference model and a production model on the front, and FIG. 11B is a graph showing a comparison of collision changes between a reference model and a production model on the side. 11a(a) and 11b(a) are graphs showing the collision change between the reference model and the production model on the front and side surfaces, and FIGS. 11a(b) and 11b(b) are the collisions between the reference model on the front and side surfaces. 11a(c) and 11b(c) are graphs showing the collision change of the production model on the front and side surfaces.
As described above, the model to be produced is modeled through the analysis result of the reference model, and the model to be produced is analyzed and compared with the reference model. If the analysis result (measured value) of the model to be produced through the comparison result does not reach the analysis result (measured value) of the reference model, the modeling of the model to be manufactured is corrected and the comparison process is repeated again.
Through the process of modeling the model to be produced and comparing the model to be modeled with the reference model that was the basis of modeling before making the actual production model, the actual production model is created to perform performance tests, and the redesigned production model is re-produced. The iterative process can be drastically reduced, and the cost and labor cost can be reduced.

The next step is the production step of the production model (S400), and the frame model necessary for the production of the production model is prepared based on the model to be produced by reflecting the comparison result of the analysis of the reference model and the model to be produced in the previous step (S500). This is the step of making the frame of the production model. Here, the production model is the actual produced model that is closest to the performance of the reference model based on the model to be produced modeled in step S300.

Drawing work is performed based on the model to be produced, which reflects the results of the analysis and comparison of the model to be produced (S300). Then, the pipe is cut and the cut pipe is bent using a bending jig, and then the surface to be welded is processed.

 Then, after the first temporary welding using a welding jig, secondary welding is performed by argon welding, an inert gas tungsten welding method. Finally, the end of the pipe is processed to remove the sharp burrs and the like to produce a frame. The material of the frame pipe is SKT290 E-G steel pipe for mechanical structure with similar properties to the reference model.

After the frame is manufactured, the frame and other parts are assembled to complete the production model. Parts other than the frame are not manufactured separately, and the parts of the benchmarking model are used. 12 shows a manufacturing process of a frame that is manufactured based on a previously created drawing.

The next step is to evaluate and compare the performance of the production model (S500), which evaluates the driving performance of the production model and compares it with the performance of the already evaluated benchmarking model. When the driving performance evaluation of the production model is made, the driving performance evaluation result of the benchmarking model evaluated in the determination of the reference model and the performance evaluation step (S100) of the benchmarking model is compared with the performance of the production model. Since the comparison of the analysis results between the reference model and the model to be produced is a virtual comparison by a computer, we compare the performance of the production model produced through the model to be actually produced and the benchmarking model, which is the reference model.

13 shows a comparison of lap time evaluation results between the production model and the reference model.

According to the results of the lap time evaluation, the total time of the reference model is 6 minutes 24 seconds 34, and the total time of the production model is 6 minutes 57 seconds 59. However, since the reference model did not include one lap in the calculation, the average model's time minus 27 seconds and 6 minutes 27 seconds 59 became the record of the production model. Therefore, it can be said that the production model exhibits performance comparable to that of the reference model.
As a result of comparing the performance of the production model and the benchmarking model, if the performance of the production model does not meet expectations, the problem is identified and redesigned.
Applied values, such as the analysis results indicated above, are values introduced as an example of a process for implementing the process of the present invention, so it goes without saying that the present invention is not limited to the indicated values.
As described above, although it has been described and illustrated in connection with a preferred embodiment for illustrating the principles of the present invention, the present invention is not limited to the configuration and operation as illustrated and described. Rather, those skilled in the art will appreciate that many changes and modifications to the present invention are possible without departing from the spirit and scope of the appended claims. Accordingly, all such suitable modifications and modifications and equivalents should be considered as falling within the scope of the present invention.

As described above, the design method of the motorsport type cart frame using the reference model of the present invention and the analytical technique is to design the cart frame by constructing an analysis model for vehicle dynamics analysis, dynamic stiffness analysis, static stiffness analysis, and collision analysis. It can facilitate the systematic approach.

In addition, it is possible to build data for its own design by benchmarking products from famous overseas manufacturers and analyzing various performances of the benchmarking frames through analytical techniques.

In addition, by establishing a basic technology for the design and fabrication of the cart's structure and frame, a systematic design system using analytical techniques is used to reduce the dependence on foreign countries and utilize a reference model and analytical techniques to establish the cart's localization. It is possible to provide a method for designing a motor sports type cart frame.

Claims (5)

In a method of designing a production model by benchmarking a conventional cart frame to determine a reference model and reflecting the analysis results of the reference model, After selecting the benchmarking model, the reference model is determined by synthesizing the results of the measurement of the structure and dimensions of the benchmarking model, and determining the reference model to evaluate the performance of the selected benchmarking model and evaluating the performance of the benchmarking model (S100); A reference model analysis step (S200) of analyzing the determined steering characteristics, stiffness, durability, and collision characteristics of the reference model; After modeling the frame of the model to be produced by reflecting the analysis result of the reference model, the steering characteristic, stiffness, durability, and collision analysis are performed to analyze and compare the model to be produced with the analysis result of the reference model (S300); A production model production step (S400) of producing a frame of the production model after creating a drawing of the production model by reflecting the comparison result of the analysis of the reference model and the model to be produced; After evaluating the driving performance of the fabricated production model, it comprises a performance evaluation and comparison step (S500) of the production model comparing with the performance evaluation of the evaluated reference model, In the reference model analysis step (S200) or the production model analysis and comparison step (S300), dynamic stiffness analysis evaluates structural torsion and bending modes for the frequency of the frame under the boundary conditions of the free-free state, The static stiffness analysis utilizes a reference model and an analytical technique that analyzes the stiffness by applying displacement to the remaining one point on one side in the condition that the rotational degrees of freedom on the other 3 points are free for the unit displacement in the XYZ direction of one point. Design method of motor sports cart frame.  According to claim 1, The durability analysis in the reference model analysis step (S200) or the production model analysis and comparison step (S300) is characterized by measuring the durability by shaking a certain angle in one direction of the other one point while the six degrees of freedom of the other three points are constrained. Design method of motor sports cart frame using reference model and analytical technique. According to claim 1, In the reference model analysis step (S200) or the production model analysis and comparison step (S300), a real vehicle collision test is performed by the finite element method, but simulating a situation in which the front and side surfaces of a frame collide against a wall at a constant speed. Design method of a motor sport type cart frame using a reference model and analytical techniques. According to claim 1, In the analysis and comparison step of the production model (S300), the reference model is modified based on the analysis result of the reference model analysis step (S200) to modify the 3D model of the model to be actually produced and to improve the performance in frontal collision. Modeling integrally, and the reference model and analytical technique characterized by extending the diameter of the frame to favor dynamic stiffness and durability and collision while expanding resources to have a favorable structure in terms of static stiffness and durability. Design method of the motor sport type cart frame utilized. According to claim 1, In the production model production step (S400), a surface to be welded after cutting of a pipe for a frame of a production model and bending of a pipe is processed, and secondary welding is performed after primary temporary welding, and a pipe end is processed to produce a frame. A method of designing a motor sport type cart frame using a reference model and analytical techniques, which is characterized by doing.

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