A method for designing a car's main carpet and a storage medium

Abstract

The application relates to a car main carpet design method, which comprises the following steps: determining the structure form of a car main carpet and the structure form of a car battery; when the structure form of the car battery adopts a non-battery body integration structure, establishing a whole vehicle SEA model, determining a simulation working condition and a car main carpet road noise sound insulation volume index; respectively determining the design parameters of multiple types of car main carpets, taking the minimum weight of the car main carpet as an optimization target, taking the satisfaction of the car main carpet road noise sound insulation performance target as a constraint condition, performing simulation optimization analysis, and obtaining multiple groups of car main carpet optimization design schemes corresponding to the multiple types of car main carpets; respectively solving the specific gravity ratios of the multiple groups of car main carpet optimization design schemes, and selecting a group of car main carpet optimization design schemes with the maximum specific gravity ratio as an optimal design scheme. The application further provides a storage medium. The application can more efficiently design a car main carpet which meets performance requirements and has lower weight.

Description

Technical Field

[0001] This invention relates to automotive main carpets, and more specifically to a design method and storage medium for automotive main carpets. Background Technology

[0002] Automotive acoustic packaging components are an important part of automobiles, primarily functioning to block and absorb noise. Major automotive acoustic packaging components include: front panel sound insulation pads, main carpet, engine compartment sound insulation pads, trunk carpet, headliner, and wheel arches. Among these, the main carpet is a key component for road noise control. Its layering, from the outside in, typically consists of a fabric layer, a rigid felt layer, a massing layer, and a soft layer. The soft layer is usually made of one of the following materials: fiber injection molding, polyurethane foam, flat-cut felt, or heat-pressed felt. The design of the main carpet is generally related to performance development goals, vehicle body structure, battery structure, the type of main carpet material, and the coverage area of ​​the main carpet, making the main carpet design process very complex.

[0003] Statistical Energy Analysis (SEA) is widely used in the automotive industry. It involves building a full-vehicle SEA simulation model using vehicle design data to predict high-frequency road noise. Professional engineers can then modify the main carpet parameters based on their engineering experience to find a main carpet that meets performance targets. However, the main carpet designed using this method may not be the most cost-effective or lightweight, and suffers from low efficiency and accuracy. Summary of the Invention

[0004] The purpose of this invention is to propose a design method and storage medium for automotive main carpets, so as to design automotive main carpets that meet performance requirements and are lighter in weight more efficiently.

[0005] The present invention discloses a method for designing automotive main carpets, comprising the following steps:

[0006] Determine the structural form of the car's main carpet and the car battery;

[0007] When the structure of the car battery adopts a non-battery integrated body structure, the statistical energy method is used to establish the whole vehicle SEA model with VAOne software to determine the simulation conditions and the road noise insulation index of the car's main carpet.

[0008] Design parameters for multiple types of automotive main carpets were determined, with the goal of minimizing the weight of the automotive main carpet and the constraint of meeting the road noise insulation performance target of the automotive main carpet. Simulation optimization analysis was carried out based on the vehicle SEA model, simulation conditions and the road noise insulation index of the automotive main carpet. Multiple sets of automotive main carpet optimization design schemes corresponding to multiple types of automotive main carpets were obtained. The soft layer materials of different types of automotive main carpets are different.

[0009] The performance-to-weight ratio of multiple automotive main carpet optimization design schemes is calculated separately, and the automotive main carpet optimization design scheme with the largest performance-to-weight ratio is selected as the preferred design scheme. The performance-to-weight ratio is the ratio of the road noise insulation volume of the automotive main carpet to the weight of the automotive main carpet.

[0010] Optionally, the simulation condition is: under the excitation of a volumetric sound source at the tire position in a simulated laboratory, the sound attenuation from the tire position to the driver's head is examined.

[0011] Optionally, the road noise reduction index of the main carpet of the vehicle is the amount of reduction in road noise pressure level.

[0012] Optionally, the following step may also be included: selecting the scheme that meets the requirements for foot feel, appearance and manufacturing process from the preferred design scheme as the optimal design scheme.

[0013] Optionally, the vehicle SEA model includes a structural subsystem model, an internal acoustic cavity subsystem model, an external acoustic cavity subsystem model, and an acoustic connection system model.

[0014] Optionally, all types of automotive main carpets include a fabric layer, a mass layer, a hard felt, and a soft layer arranged sequentially.

[0015] Optionally, the soft layers of the various types of automotive main carpets may be fiber injection molding layers, polyurethane foam layers, flat-cut felt layers, and hot-pressed felt layers.

[0016] Optionally, after obtaining multiple sets of optimized design schemes for automotive main carpets corresponding to multiple types of automotive main carpets, the following steps are also included: substituting the multiple sets of optimized design schemes into the vehicle SEA model to verify whether they meet the road noise insulation performance target of the automotive main carpet; if they do not meet the target, modifying the optimization range of the design parameters and re-performing simulation optimization analysis.

[0017] Optionally, when the car battery adopts an integrated battery-body structure, the optimal design solution is to select a car main carpet that meets the requirements for foot feel, appearance, and manufacturing process.

[0018] The present invention also proposes a storage medium storing one or more computer-readable programs, which, when executed by one or more processors, can implement the automotive main carpet design method as described above.

[0019] This invention enables the more efficient design of automotive main carpets that meet performance requirements while being lighter, and features speed, efficiency, precision, and ease of operation. Attached Figure Description

[0020] Figure 1 This is a flowchart of the automotive main carpet design method described in the specific implementation embodiment;

[0021] Figure 2 This is a schematic diagram of the vehicle SEA model described in the specific implementation method;

[0022] Figure 3 This is a schematic diagram of the shape of the main car carpet described in the specific implementation embodiment;

[0023] Figure 4 This is a schematic diagram of the layered structure of the main carpet in a car as described in a specific embodiment. Detailed Implementation

[0024] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0025] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0026] like Figure 1 The method for designing a car's main carpet includes steps S100, S200, S300, and S400, as detailed below:

[0027] S100: Determine the structural form of the car's main carpet and the car's battery;

[0028] In specific implementation, such as Figure 3 and Figure 4As shown, the structure of the car main carpet 20 includes its shape and layered structure. After determining the layered structure of the car main carpet, different materials can be selected for one or more layers to form different types of car main carpets. The structure of the car battery includes integrated battery and body structure and non-integrated battery and body structure. With the development of various new technologies in new energy vehicles, the body and battery of new energy vehicles are usually designed and manufactured separately, and then connected and assembled into a whole vehicle by bolts. There is a gap of several centimeters between the body floor and the battery cover, which is the CTP (Cell to Pack) structure. The CTP (Cell to Pack) structure is a non-integrated battery and body structure. In recent years, the integrated battery and body structure has developed very rapidly. Typical integrated battery and body structures include CTC (Cell to Chassis), CTB (Cell to Body), and CTV (Cell to Vehicle). There is no gap between the body floor and the battery cover of these integrated battery and body structures. Compared with the CTP structure, the integrated battery and body structure has an inherent advantage in controlling road noise.

[0029] S200: When the vehicle battery adopts a non-battery integrated body structure, a whole-vehicle SEA model is established using VAOne software with statistical energy methods. This whole-vehicle SEA model is a high-frequency noise simulation model. The simulation conditions and road noise insulation index of the vehicle's main carpet are determined for simulation optimization analysis. As a specific example, such as... Figure 2 As shown, the vehicle SEA model 10 includes a structural subsystem model 101 (including the body structure and acoustic components), an internal acoustic cavity subsystem model 102, an external acoustic cavity subsystem model 103, and an acoustic connection system model 104. The simulation conditions are: the simulation laboratory uses a volumetric sound source to excite the sound at the tire position and examines the sound attenuation from the tire position to the driver's head; the road noise insulation index of the main carpet of the car is the reduction in road noise pressure level.

[0030] As a specific example, the overall road noise insulation performance of a vehicle is typically judged by its sound insulation performance in the 1 / 3 octave band at frequencies ranging from 200 to 8000 Hz. In actual project development, to facilitate the evaluation of the contribution of the car's main carpet to overall vehicle sound insulation, the sound pressure level curves of the driver's head response at the 1 / 3 octave band frequency were calculated separately with and without the main carpet. The response curves were normalized, and the total sound pressure level P was used as the evaluation index. The formula for calculating P is:

[0031]

[0032] In the formula, i represents the number of frequency bands in the 200–8000Hz range, divided into 1 / 3 octave bands. The center frequencies corresponding to each frequency band are 200Hz, 250Hz, 315Hz, 400Hz, 500Hz, 630Hz, 800Hz, 1000Hz, 1250Hz, 1600Hz, 2000Hz, 2500Hz, 3150Hz, 4000Hz, 5000Hz, 6300Hz, and 8000Hz. Road noise simulation analysis shows that compared to a vehicle without a main carpet, having a main carpet reduces road noise by a certain amount ΔP. The larger ΔP is, the better the sound insulation effect of the main carpet against road noise.

[0033] S300: Design parameters for multiple types of automotive main carpets are determined, with the goal of minimizing carpet weight and meeting road noise insulation performance targets. Simulation optimization analysis is conducted based on the vehicle's SEA model, simulation conditions, and the road noise insulation index of the automotive main carpets. Multiple optimized design schemes for automotive main carpets corresponding to different types are obtained. The soft layer materials differ among the different types of automotive main carpets. As a specific example, such as... Figure 4 As shown, the various types of automotive main carpets all include a fabric layer 201, a mass layer 202, a rigid felt layer 203, and a soft layer 204 arranged sequentially. The mass layer is parameterized by its surface density, and the rigid felt layer is parameterized by its density and thickness. The soft layers of the various types of automotive main carpets are fiber injection molding layer, polyurethane foam layer, flat-cut felt layer, and hot-pressed felt layer, with corresponding parameters of fiber injection molding density and thickness, polyurethane foam thickness, flat-cut felt density and thickness, and hot-pressed felt surface density, respectively. Obviously, in other embodiments, the layer structure of the automotive main carpet 20 can also adopt other layer structures, such as a five-layer structure or a six-layer structure.

[0034] S400: Solve the performance-to-weight ratio (SPR) of multiple optimized design schemes for the main car carpet, and select the scheme with the highest SPR as the preferred design. The SPR is the ratio of the road noise insulation level of the main car carpet to the weight of the main car carpet. In practical implementation, the driving range of a car is directly related to its weight. Lightweight design of important car components is crucial for controlling the overall vehicle weight. The ratio of the reduction in road noise level ΔP (i.e., the road noise insulation level of the main car carpet) to the weight of the main car carpet is defined as the SPR, and the larger the ratio, the better.

[0035] In some embodiments, the automotive main carpet design method further includes the following step: selecting the optimal design scheme from the preferred design schemes that meets the requirements for foot comfort, appearance, and manufacturing process. In specific implementation, the scheme that meets the requirements for foot comfort, appearance, and manufacturing process can be selected through evaluation and scoring by evaluators.

[0036] In some embodiments, after obtaining multiple sets of optimized design schemes for automotive main carpets corresponding to multiple types of automotive main carpets, the method further includes the following steps: substituting the multiple sets of optimized design schemes into the vehicle SEA model to verify whether they meet the road noise insulation performance target of the automotive main carpet; if they do not meet the target, modifying the optimization range of the design parameters of the optimized design schemes that do not meet the road noise insulation performance target of the automotive main carpet and re-performing simulation optimization analysis until all multiple sets of optimized design schemes pass the verification.

[0037] In some embodiments, when the structure of the car battery adopts an integrated battery-body structure, the car main carpet that meets the requirements of foot feel, appearance and manufacturing process is selected as the optimal design solution.

[0038] As a specific example, the design process of the main carpet of car A will be used to illustrate the implementation of the present invention. The design method of the main carpet includes the following steps:

[0039] Determine the structure of the main carpet and the battery of car A. The main carpet has a four-layer structure, including a fabric layer, a weight layer, a hard felt layer, and a soft layer. The soft layer is either a fiber injection molding layer, a polyurethane foam layer, a flat-cut felt layer, or a hot-pressed felt layer. The battery has a CTP structure.

[0040] A vehicle SEA model was established using VAOne software with a statistical energy method for vehicle A. The vehicle SEA model includes a structural subsystem model, an internal acoustic cavity subsystem model, an external acoustic cavity subsystem model, and an acoustic connection system model. The simulation conditions and the road noise insulation index of the vehicle's main carpet were determined for simulation optimization analysis. The simulation conditions were: a laboratory simulation with volumetric sound source excitation at the tire position, examining the sound attenuation from the tire position to the driver's head; the road noise insulation index of the vehicle's main carpet was the reduction in road noise pressure level.

[0041] Design parameters for various types of automotive main carpets were determined, with the goal of minimizing the weight of the automotive main carpet and the constraint of meeting the road noise insulation performance target of the automotive main carpet. Simulation optimization analysis was conducted based on the vehicle's SEA model, simulation conditions, and the road noise insulation index of the automotive main carpet, resulting in multiple sets of optimized design schemes for automotive main carpets corresponding to different types of carpets. These optimized design schemes are shown in the table below.

[0042]

[0043]

[0044] Substituting multiple optimized design schemes into the vehicle SEA model, it was verified whether they met the road noise insulation performance target of the main carpet. The analysis showed that the average sound pressure levels of the four schemes—fiber injection molding, polyurethane foam, flat-cut felt, and hot-pressed felt carpet—were 62.9 dB, 62.9 dB, 62.8 dB, and 62.8 dB, respectively, all of which met the road noise insulation performance target (average sound pressure level 62.5 dB).

[0045] The weighting ratios of multiple automotive main carpet optimization design schemes were calculated separately, as shown in the table below:

[0046] Car floor carpet contribution, dB 7.2 7.2 7.1 7.1 Weight, kg 7.8 7.2 8 8.6 Sex-to-weight ratio, dB / Kg 0.92 1 0.89 0.83

[0047] Based on the above weight ratio analysis results, the optimal design scheme for automotive main carpet is selected as fabric layer + weight layer + hard felt layer + polyurethane foam layer.

[0048] After review, the optimal design scheme met the requirements for foot feel, appearance, and manufacturing process. Therefore, the optimal design scheme was determined to be the main carpet design scheme for car A, and the main carpet design for car A was completed.

[0049] The present invention also proposes a storage medium storing one or more computer-readable programs, which, when executed by one or more processors, can implement the automotive main carpet design method as described above.

[0050] The automotive main carpet design method proposed in this invention can complete the construction of the whole vehicle SEA model, the establishment of the optimization model, and the simulation optimization design within VAOne software, without the need for additional software. It features simplicity and wide applicability, improving the efficiency of automotive main carpet optimization design. Furthermore, it allows for performance-to-weight ratio analysis of automotive main carpets made of different materials, enabling more efficient design of automotive main carpets that meet performance requirements while being lighter. This automotive main carpet design method also proposes design strategies for automotive main carpets with different battery structures, while meeting project development performance objectives.

[0051] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. In the description of this specification, the reference to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., means that a specific feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Furthermore, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

Claims

1. A method for designing automotive main carpets, characterized in that, Includes the following steps: Determine the structural form of the car's main carpet and the car battery; When the structure of the car battery adopts a non-battery integrated body structure, the statistical energy method is used to establish the whole vehicle SEA model with VAOne software to determine the simulation conditions and the road noise insulation index of the car's main carpet. Design parameters for multiple types of automotive main carpets were determined, with the goal of minimizing the weight of the automotive main carpet and the constraint of meeting the road noise insulation performance target of the automotive main carpet. Simulation optimization analysis was carried out based on the vehicle SEA model, simulation conditions and the road noise insulation index of the automotive main carpet. Multiple sets of automotive main carpet optimization design schemes corresponding to multiple types of automotive main carpets were obtained. The soft layer materials of different types of automotive main carpets are different. The performance-to-weight ratio of multiple automotive main carpet optimization design schemes is calculated separately, and the automotive main carpet optimization design scheme with the largest performance-to-weight ratio is selected as the preferred design scheme. The performance-to-weight ratio is the ratio of the road noise insulation volume of the automotive main carpet to the weight of the automotive main carpet.

2. The automotive main carpet design method according to claim 1, characterized in that, The simulation condition is as follows: the simulation laboratory uses a volumetric sound source to excite the sound at the tire position and examines the sound attenuation from the tire position to the driver's head.

3. The automotive main carpet design method according to claim 2, characterized in that, The road noise reduction index of the main carpet in automobiles is the amount of reduction in road noise pressure level.

4. The automotive main carpet design method according to claim 1, characterized in that, It also includes the following steps: Among the preferred design schemes, the scheme that meets the requirements of foot feel, appearance and manufacturing process is selected as the optimal design scheme.

5. The automotive main carpet design method according to claim 1, characterized in that, The vehicle SEA model includes a structural subsystem model, an internal acoustic cavity subsystem model, an external acoustic cavity subsystem model, and an acoustic connection system model.

6. The automotive main carpet design method according to claim 1, characterized in that, All types of automotive main carpets include a fabric layer, a weight layer, a hard felt, and a soft layer arranged sequentially.

7. The automotive main carpet design method according to claim 6, characterized in that, The soft layers of the various types of automotive main carpets are respectively a fiber injection molding layer, a polyurethane foam layer, a flat-cut felt layer, and a hot-pressed felt layer.

8. The automotive main carpet design method according to claim 1, characterized in that, After obtaining multiple sets of optimized design schemes for automotive main carpets corresponding to multiple types of automotive main carpets, the following steps are also included: substituting the multiple sets of optimized design schemes into the vehicle SEA model to verify whether they meet the road noise insulation performance target of automotive main carpets. If they do not meet the target, the optimization range of the design parameters is modified and simulation optimization analysis is performed again.

9. The automotive main carpet design method according to claim 1, characterized in that, When the structure of a car battery adopts an integrated battery-body structure, the optimal design solution is to select a car main carpet that meets the requirements of foot feel, appearance, and manufacturing process.

10. A storage medium, characterized in that, It stores one or more computer-readable programs, which, when executed by one or more processors, can implement the automotive main carpet design method as described in any one of claims 1 to 9.

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