A method, device, equipment and medium for reducing resistance of a steerable sled

Abstract

The embodiment of the specification provides a drag reduction design method, device and equipment of a steered sled and a medium, wherein the method comprises the following steps: a vehicle body, a lower vehicle body, a front bumper and a rear bumper constituting a sled main body are established through modeling software; according to IBSF rules, a top control curve, a horizontal control curve, two side control curves and a bottom control curve under the vehicle body are designed through a parameterized modeling method, the control curves are controlled by the maximum length and the maximum width of the curve; the front bumper and the rear bumper of the sled are designed by using a symmetrical drag reduction profile, and the overall modeling of the sled is completed, so as to solve the technical problems that the model design efficiency of the steered sled is low in the related art, and the different requirements of different athletes are difficult to meet when the rules are satisfied in priority.

Description

Technical Field

[0001] This invention relates to the field of model design technology, and in particular to a drag reduction design method, device, equipment and medium for a ruddered sled. Background Technology

[0002] In recent years, as the IBSF (International Bobsleigh and Skeleton Federation) has tightened its regulations on bobsleighs, the space for modification to the bobsleigh's shape has become increasingly limited. Current bobsleigh designs mostly employ smooth, streamlined cross-sectional configurations, with the body sections often designed as individual units to meet specific needs, resulting in long design cycles. Furthermore, there is currently no literature detailing the design of the pointed front section; typically, the front cross-sectional area of ​​the bobsleigh is reduced directly, and combined with optimized cockpit openings, this can lower the overall projected area of ​​the vehicle, thereby reducing drag. Regarding bumper design, due to the IBSF's stringent safety requirements, bumper design is, to some extent, a trade-off between superior aerodynamics and enhanced safety.

[0003] Traditional design methods, due to frequent changes in IBSF rules, require independent design for each iteration, resulting in low design efficiency. Prioritizing rule compliance makes it difficult to meet the diverse needs of different athletes. Furthermore, this approach prioritizes safety over aerodynamic design, leading to inconsistencies and unreliable performance. In contrast, bobsleigh design, in addition to ensuring safety, aims for maximum speed and allows for rapid modification and optimization based on rule changes, enabling personalized customization for different athletes. Summary of the Invention

[0004] To overcome the problems existing in the related technologies, this disclosure provides a drag reduction design method, device, equipment and medium for bobsleds, in order to solve the technical problems of low design efficiency of bobsled model in the related technologies and difficulty in meeting the different needs of different athletes by prioritizing the rules.

[0005] This specification provides one or more embodiments of a drag reduction design method for a ruddered sled, including the following steps: The upper and lower body, front bumper and rear bumper of the sled are created using modeling software. According to the IBSF rules, a parametric modeling method is used to design the top control curve, the horizontal control curve, the side control curves, and the bottom control curve under the vehicle body, which are controlled by the maximum length and maximum width of the curve. The front and rear bumpers of the sled are designed with a symmetrical drag-reducing profile.

[0006] This specification provides one or more embodiments of a drag reduction design device for a ruddered sled, comprising: The main body construction module is used to create the upper and lower body of the sled, the front bumper and the rear bumper, which constitute the main body of the sled, using modeling software. The control curve design module is used to design, according to IBSF rules and through parametric modeling methods, the top control curve, horizontal control curve, side control curves, and bottom control curve under the vehicle body, which are controlled by the maximum length and maximum width of the curve. The bumper module is used to design the front and rear bumpers of the sled using a symmetrical drag-reducing profile.

[0007] One or more embodiments of the specification provide a computer device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the drag reduction design method for a ruddered sled as described above.

[0008] This specification provides one or more embodiments of a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the drag reduction design method for a ruddered sled as described above.

[0009] This disclosure provides a drag reduction design method, device, equipment, and medium for a bobsled. Its advantages lie in the fact that, based on IBSF rules, curve parameters are set, and by adjusting these parameters, model modifications can be quickly completed, improving modeling efficiency and reducing design costs. Furthermore, the parametric method parameterizes the bobsled's shape into eight parameters across four curves for precise control, enabling personalized customization to meet the diverse needs of different athletes. Simultaneously, the drag reduction design principle perfectly balances bobsled safety and aerodynamic performance. The addition of control curves on both sides to the traditional shape allows for precise control of each cross-section of the bobsled, effectively reducing the projected area.

[0010] In addition, the front and rear bumpers adopt symmetrical drag-reducing cross-sections. The proportions are fixed by the positional relationship between the wing surface and the chord length. The chord length is adjusted to make the bumper dimensions meet the requirements of the regulations, while satisfying the optimal aerodynamic shape and safety. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in one or more embodiments of this specification or in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 A flowchart illustrating a drag reduction design method for a ruddered sled provided for one or more embodiments of this specification; Figure 2 A schematic diagram of the overall shape of a rudder sled designed for one or more embodiments of this specification; Figure 3 A schematic diagram of the overall shape of the rudder provided in one or more embodiments of this specification is generated by the intersection of a cross section and a control curve. Figure 4 A block diagram of a drag reduction design device for a ruddered sled provided for one or more embodiments of this specification; Figure 5 This is a schematic diagram of the structure of a computer device provided for one or more embodiments of this specification. Detailed Implementation

[0013] To enable those skilled in the art to better understand the technical solutions in one or more embodiments of this specification, the technical solutions in one or more embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this specification, and not all of the embodiments. Based on one or more embodiments of this specification, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this invention.

[0014] This invention is used in the design of bobsleighs to achieve rapid design and modification of bobsleighs. In the design of bobsleighs, firstly, based on design principles, four control equations are determined as the frame curves of the bobsleigh: the top control curve (2), the horizontal control curve (3), the side control curves (4), and the bottom control curve (6). Secondly, through the constraints of IBSF rules, the main curve parameters of the three curves are determined, and then the curve functions of the four control curves are determined. Then, through the intersection points of multiple axial sections of the car body required by the IBSF rules with the four control curves, multiple axial sections of the car body are established. Then, the external surface of the bobsleigh car body is generated using the section curves and the four control curves. Next, the dimensions of each section are checked according to the requirements of the IBSF rules, and the control curve parameters are adjusted to meet the rule requirements, completing the overall external surface modeling of the bobsleigh car body. Finally, a reduction curve is designed as the section curve of the bobsleigh bumper, completing the design of the bobsleigh bumper, and finally completing the design of the bobsleigh. The invention will now be described in detail with reference to specific embodiments and the accompanying drawings.

[0015] Method Implementation Examples According to an embodiment of the present invention, a drag reduction design method for a ruddered sled is provided, such as... Figure 1The diagram shown is a flowchart of the drag reduction design method for a bobsled sled provided in this embodiment. The drag reduction design method for a bobsled sled according to this embodiment includes: Step S1: Use modeling software to create the upper body 1, lower body 5, front bumper 7, and rear bumper 8 that constitute the main body of the sled.

[0016] Step S2: According to the IBSF rules, design the top control curve 2, the horizontal control curve 3, the two side control curves 4, and the bottom control curve 6 under the vehicle body 5, which are controlled by the maximum length and maximum width of the curves, using the parametric modeling method.

[0017] In this embodiment, the top control curve 2, the horizontal control curve 3, and the side control curves 4 are specifically defined in Equation 1. These are Hacck family curves, and the control function describes the curve that minimizes air resistance under certain given parameters (e.g., length L, diameter R, or volume), where parameters L and R represent the maximum length and maximum width of the curve. Therefore, the overall shape of the sled is parameterized by eight parameters: top control (L1, R1), horizontal control (L2, R2), side control (L3, R3), and bottom control (L4, R4) of the sled. During initial modeling, the parameters L and R of the four curves are established based on the IBSF rules to define the size range, thus establishing the control curves. After establishing the control curves, the shape of each section can be determined by the intersection points of multiple axial sections of the sled with the control curves. (Refer to...) Figure 3 Then, surface models of the upper part 1 and the lower part 2 of the sled body are generated respectively, thereby completing the modeling of the overall outer surface of the sled.

[0018] In this embodiment, since the cross-section of the sled is an arc formed by the intersection of the cross-section and the control curve, if there are only two control curves (top and horizontal), there are only two intersection points, therefore the curve is an arc. For example, the IBSF rules might require... x = a Maximum height Y of the cross section max and maximum width Z max The minimum value corresponds to y 1, z 1 or x = a The cross section at a certain height Y= y a Minimum value of width Z aThese two values ​​will not perfectly match a cross-section with a very small cross-sectional area. Due to the need for increased height or wider sides, the resulting cross-sectional width may be much larger than the minimum size required by the rules (or the cross-sectional height may be much larger than the minimum size required by the rules), thus increasing the unnecessary cross-sectional area. For example, in a specific case, the minimum height of the apex at the IBSF rule opening is 650mm; the minimum maximum width of the cross-section at 1200mm from the rear axle must be greater than 680mm; the minimum width of the cross-section at 500mm from the reference position (related to the position of the internal athlete seats, difficult to describe separately) at a height of 400mm is 550mm, etc. Therefore, the design here is summarized as X=a. In a conventional design, the cross-section is a single-segment arc. Because the height is fixed, this design, while meeting the 550mm width requirement, will result in a very large arc area. Simultaneously, to meet the 550mm width requirement, the width at 1200mm may be much larger than 680mm, increasing the unnecessary cross-sectional area. The control curves on both sides designed in this paper can apply more precise control to the width at different positions, reducing this unnecessary area. Meanwhile, the presence of control curves on both sides also increases the number of intersection points between the curves and the cross section by two, changing the cross section arc from a single segment to a two-segment one, further reducing the area of ​​the cross section.

[0019] In this embodiment, by adding control curves 4 on both sides, the cross-section becomes two circular arcs, allowing both width and height to simultaneously meet the minimum requirements of the rules. The other end point is controlled by the intersection of the cross-section and the control curves on both sides. This minimizes unnecessary cross-sectional area, thus effectively reducing the sled's projected area.

[0020] The top control curve 2, the horizontal control curve 3, the two side control curves 4, and the bottom control curve 6 are specifically defined as follows: Formula 1; Where parameters L and R are the maximum length and maximum width of the curve, x x-axis, C For coefficients, As transition parameters, based on the size range required by the IBSF rules, the parameters L and R of the four curves are established to establish the control curves.

[0021] The corresponding point can be determined by rules, drag reduction design, or athlete requirements, for example ( x 1, y 1)( x 2, y 2) To solve for the R and L values ​​of the corresponding control curve.

[0022] The parametric modeling method for sleds in this embodiment only requires adjusting the parameter L of the corresponding control curve when subsequent rule changes are required, such as those by the IBSF, or when different athletes have different requirements for certain cross-sectional positions. n and R n This allows for the automatic generation of the sled's shape, eliminating the need to repeat the modeling steps for the vehicle body and bumpers. This significantly shortens the sled design cycle, making personalized designs for different athletes possible and reducing sled design costs.

[0023] For example, when the rules require modification of the sled axis x Height at point 1 y 1 Minimum change is y When it reaches point 2, only the corresponding point needs to be modified. x 1, y 1) is ( x 1, y 2) Then, the new R and L values ​​are obtained through Equation 1. The original curve parameters R and L are then modified, and the curve will change accordingly. The model will also change accordingly, and the modification can be completed quickly.

[0024] Step S3: Design the front bumper 7 and rear bumper 8 of the sled using a symmetrical drag-reducing profile to complete the overall modeling of the sled.

[0025] In this embodiment, after the upper part 1, lower part 2, front bumper 7, and rear bumper 8 of the sled are designed and then assembled together, the overall model of the sled is completed. The remaining parts, such as the sled opening, handles, and steering shaft, only need to be designed according to the rules and requirements. Figure 2 The overall shape of the sled shown.

[0026] In this embodiment, the front bumper 7 and rear bumper 8 of the sled adopt a symmetrical drag-reducing profile design. The ratio of the distance from the airfoil surface to the chord length to the chord length is a fixed value. When modeling, the chord length is enlarged proportionally according to the bumper size required by the rules to obtain the corresponding profile shape.

[0027] In this embodiment, the bumper cross-section is based on some symmetrical airfoils, which are then modified to conform to the IBSF rules.

[0028] The method provided in this embodiment, based on IBSF rules, innovatively adds two control curves (3) on both sides. Compared to the traditional sled shape, by adjusting the curve parameters, the model can be modified quickly, improving modeling efficiency and reducing design costs. Furthermore, the parametric method parameterizes the sled shape into eight parameters of four curves for precise control, enabling personalized customization for different athletes' needs. Simultaneously, it employs drag-reduction design principles to perfectly balance sled safety and aerodynamic performance. The addition of two control curves on both sides to the traditional shape allows for precise control of each cross-section of the sled, effectively reducing the projected area.

[0029] In addition, the front and rear bumpers adopt symmetrical drag-reducing cross-sections. The proportions are fixed by the positional relationship between the wing surface and the chord length. The chord length is adjusted to make the bumper dimensions meet the requirements of the regulations, while satisfying the optimal aerodynamic shape and safety.

[0030] Device Examples According to an embodiment of the present invention, a drag reduction design device for a ruddered sled is provided, such as... Figure 4 The diagram shown is a block diagram of a drag reduction design device for a bobsled sled provided in this embodiment. The drag reduction design device for a bobsled sled according to an embodiment of the present invention includes: The main construction module 10 is used to create the upper body 1, lower body 5, front bumper 7 and rear bumper 8 that constitute the main body of the sled using modeling software; The control curve design module 20 is used to design, according to IBSF rules and through parametric modeling methods, the top control curve 2, the horizontal control curve 3, the two side control curves 4, and the bottom control curve 6 under the vehicle body 5, which are controlled by the maximum length and maximum width of the curve. The bumper mounting module 30 is used to design the front bumper 7 and rear bumper 8 of the sled using a symmetrical drag-reducing profile.

[0031] In this embodiment, the device, based on IBSF rules, features an innovative two-sided control curve design module 20. Compared to traditional sled shapes, adjusting the curve parameters allows for rapid model modification, improving modeling efficiency and reducing design costs. Furthermore, the parametric method precisely controls the sled shape using eight parameters across four curves, enabling personalized customization to meet the diverse needs of different athletes. Simultaneously, the drag-reduction design principle perfectly balances sled safety and aerodynamic performance. The addition of two-sided control curves to the traditional shape allows for precise control of various sled cross-sections, effectively reducing the projected area.

[0032] In this embodiment, the top control curve 2, horizontal control curve 3, side control curves 4, and bottom control curve 6 designed by the control curve design module 20 are specifically as follows: ; Where parameters L and R are the maximum length and maximum width of the curve, x x-axis, C For coefficients, As transition parameters, based on the size range required by the IBSF rules, the parameters L and R of the four curves are established to establish the control curves.

[0033] In this embodiment, the front bumper 7 and rear bumper 8 of the bumper setting module 30 are designed with symmetrical drag-reducing profiles, and the ratio of the distance from the airfoil profile to the chord length to the chord length is a fixed value.

[0034] The embodiments of the present invention are device embodiments corresponding to the above method embodiments. The specific operations of each module processing step can be understood with reference to the description of the method embodiments, and will not be repeated here.

[0035] like Figure 5 As shown, the present invention also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, it implements the drag reduction design method for the ruddered sled in the above embodiments, or when the computer program is executed by a processor, it implements the drag reduction design method for the ruddered sled in the above embodiments.

[0036] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0037] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for apparatus or system embodiments, since they are basically similar to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. The apparatus and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and the contents not described in detail in the specification of the present invention are well known to those skilled in the art.

Claims

1. A drag reduction design method for a ruddered sled, characterized in that, Including the following steps: The upper (1), lower (5), front bumper (7), and rear bumper (8) of the sled are constructed using modeling software. According to the IBSF rules, the top control curve (2), the horizontal control curve (3), the side control curves (4), and the bottom control curve (6) under the vehicle body (5) are designed by the parametric modeling method. The front bumper (7) and rear bumper (8) of the sled are designed using a symmetrical drag-reducing profile to complete the overall modeling of the sled; The top control curve (2), horizontal control curve (3), side control curves (4), and bottom control curve (6), which are controlled by the maximum length and maximum width of the curve, are specifically as follows: ； Where parameters L and R are the maximum length and maximum width of the curve, x x-axis, C For coefficients, As transition parameters, based on the size range required by the IBSF rules, the parameters L and R of the four curves are established to establish the control curves.

2. The drag reduction design method for a ruddered sled as described in claim 1, characterized in that, The front bumper (7) and rear bumper (8) are selected with symmetrical drag-reducing profiles, and the ratio of the distance from the airfoil profile to the chord length to the chord length is a fixed value.

3. The drag reduction design method for a ruddered sled as described in any one of claims 1-2, characterized in that, The modeling software includes UG or SolidWorks.

4. A drag reduction design device for a ruddered sled, characterized in that, include: The main body construction module is used to build the upper (1), lower (5), front bumper (7) and rear bumper (8) of the sled body through modeling software. The control curve design module is used to design, according to the IBSF rules, the top control curve (2), the horizontal control curve (3), the side control curves (4), and the bottom control curve (6) under the vehicle body (5) by parametric modeling method, which are controlled by the maximum length and maximum width of the curve. The bumper setting module is used to design the front bumper (7) and rear bumper (8) of the sled using a symmetrical drag-reducing profile. The top control curve (2), horizontal control curve (3), side control curves (4), and bottom control curve (6) designed by the control curve design module are as follows: ； Where parameters L and R are the maximum length and maximum width of the curve, x x-axis, C For coefficients, As transition parameters, based on the size range required by the IBSF rules, the parameters L and R of the four curves are established to establish the control curves.

5. The drag reduction design device for a ruddered sled as described in claim 4, characterized in that, The front bumper (7) and rear bumper (8) of the bumper setting module are designed with symmetrical drag-reducing profiles, and the ratio of the distance from the airfoil profile to the chord length to the chord length is a fixed value.

6. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the drag reduction design method for a rudder as described in any one of claims 1 to 3.

7. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the drag reduction design method for a ruddered sled as described in any one of claims 1 to 3.

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