A low-noise tire for new energy vehicles with anti-groove bottom cracking and its optimized design method and system

Abstract

This invention relates to the field of tire structure design technology, and in particular to a low-noise new energy vehicle tire with anti-groove bottom cracking and its optimization design method and system. This tire constructs a joint optimization model with thickness as the core variable by uniformly measuring and constraining the stress and strain amplification effects and extreme value location migration at the same groove bottom sampling nodes for grooved / grooveless models. This determines the optimal groove thickness that can suppress groove resonance / pump noise, control the amplification of principal stress and principal strain at the groove bottom, and avoid hot spot migration. The results are directly converted into mold parameters and manufacturing tolerances, forming a manufacturable and reproducible design-manufacturing closed loop.

Description

Technical Field

[0001] This invention relates to the field of tire structure design technology, and in particular to a low-noise new energy vehicle tire with anti-groove bottom cracking and its optimized design method and system. Background Technology

[0002] Tire tread grooves serve multiple functions, including drainage, heat dissipation, grip, and block compliance, while also directly affecting rolling noise and local durability. During vehicle operation, the main tread grooves, upon entering the contact area, form a nearly closed or semi-closed airflow channel with the road surface. The compression, expulsion, and re-intake of air within the grooves easily generate air pumping noise and groove resonance noise. To reduce this type of noise, existing technologies typically involve adding additional structures to the tread groove area to alter the airflow state, acoustic impedance conditions, or equivalent resonance paths, thereby attenuating narrowband noise peaks.

[0003] For example, Chinese utility model patent CN204340561U discloses a noise-reducing tire tread groove structure. This structure involves placing a Helmholtz resonator connected to the main tire groove within one side wall of the groove. The Helmholtz resonator consists of a resonant cavity and a small-hole channel, forming a T-shaped structure. The noise of the tire tread is reduced through the noise-absorbing effect of the Helmholtz resonator. It also points out that existing technologies also employ methods to disrupt the direction of the compressed airflow and destroy the gas vortex within the groove by placing multiple small rectangular blocks or other non-smooth structures within the main groove to achieve noise reduction. However, such methods present challenges in mold manufacturing. In other words, setting additional noise-reducing structures around the tread groove area is a common noise reduction approach in this field, but such structural designs typically require a balance between noise reduction effectiveness and ease of manufacturing.

[0004] For example, the non-patented literature *Fatigue Life Prediction of a Groove Bottom of Green All Steel Radial Rubber Tires* (Kangyu Luo, Hao Kong, Zhanfu Yong, published in *Journal of Applied Polymer Science*, 2025, Vol. 142, Article No. e57002, DOI: 10.1002 / app.57002) discloses research on fatigue life at the bottom of tire tread grooves. This literature points out that crack failure is prone to occur in the tire tread groove area and predicts the fatigue life at the bottom of the groove based on finite element analysis and damage parameter evaluation. This literature shows that the bottom of the groove is a locally mechanically sensitive area of ​​the tread, and the initiation of fatigue cracks there is closely related to local stress and strain concentration. Therefore, when introducing new additional structures in the tread groove area, especially near the bottom, in addition to considering noise reduction effects, attention should also be paid to their impact on the local mechanical state of the groove bottom and the risk of crack initiation.

[0005] Based on the aforementioned existing technologies, it can be seen that current tire tread groove noise reduction designs mainly focus on altering the airflow state or acoustic resonance conditions within the groove by introducing resonant cavities, microstructures, or other additional structures, thereby reducing groove noise. Simultaneously, some studies analyze the local stress and damage behavior of the groove bottom region from a fatigue life perspective. However, existing technologies lack a systematic and unified public disclosure regarding the changes in the local mechanical response at the groove bottom after the introduction of noise reduction structures, particularly the impact on groove bottom stress, strain amplification, and the migration of the maximum stress area.

[0006] Especially when sound-absorbing grooves, resonant cavities, or similar additional groove structures are installed near the bottom of the groove, although this may improve tire noise performance, it also changes the local cross-sectional stiffness and load transfer path of the groove bottom. This can lead to new stress concentration points or strain concentration zones in the groove bottom area, increasing the risk of groove bottom crack initiation. Currently, there is a lack of a method to compare stress and strain point-by-point at the same groove bottom sampling node under conditions of additional and no additional structures, and to comprehensively evaluate structural parameters by combining extreme value location migration. Therefore, in actual development, the thickness, groove position, or size parameters of noise reduction structures are often mainly determined by experience, making it difficult to simultaneously achieve both noise reduction effect and groove bottom crack resistance.

[0007] Furthermore, the thickness, depth, and geometric transition of the additional noise reduction structure directly affect the mold processing difficulty, dimensional consistency, and mass production stability. Without quantitative optimization data to address local durability risks at the bottom of the trench, insufficient noise reduction may occur, while excessive local geometric weakening could increase the principal stress and strain at the bottom of the trench, inducing bottom cracks, root cracks, or early fatigue failure.

[0008] Therefore, there is an urgent need for an optimization method for the thickness of the sound insulation groove at the bottom of the tire tread groove, in order to solve the problem that it is difficult to balance noise reduction performance, local durability performance of the groove bottom, and manufacturing feasibility after the sound insulation groove is set, thereby reducing the risk of groove bottom cracks and improving the overall service life and engineering application reliability of the tire. Summary of the Invention

[0009] To address the aforementioned technical problems, the technical objective of this invention is to propose a low-noise new energy vehicle tire with anti-groove bottom cracking and its optimized design method. By uniformly measuring and constraining the stress and strain amplification effects and extreme value location migration at the same groove bottom sampling nodes for grooved / grooveless models, a joint optimization model with thickness as the core variable is constructed. This model determines the optimal groove thickness that can suppress groove resonance / pump noise, control the amplification of principal stress and principal strain at the groove bottom, and avoid hot spot migration. The results are then directly converted into mold parameters and manufacturing tolerances, forming a manufacturable and reproducible design-manufacturing closed loop.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] A low-noise tire for new energy vehicles that prevents bottom cracking and its optimized design method includes the following steps:

[0012] S1. Establish a 3D model of the reference tread without sound insulation grooves and a parametric model with sound insulation grooves, using the thickness of the sound insulation grooves as an optimization variable. Finite element analysis was performed under static load conditions of nominal inflation pressure and nominal wheel load, and a local coordinate system was set at the bottom of the trench to extract the stress and strain components of the sampling node set at the bottom of the trench.

[0013] S2. At the same sampling node at the bottom of the trench, compare the models with and without trenches at the same node, and calculate the stress / strain amplification factor. , For components At the node Location, thickness is The magnification factor relative to the slotless reference.

[0014] S3. Determine the extreme value positions of the aforementioned components, identify the extreme value nodes of the models with and without slots, and calculate the extreme value position migration amount. , For components In thickness Extreme position migration amount;

[0015] S4, Amplification Factor With location migration The integration is a joint optimization objective, and the thickness is considered. To perform optimization;

[0016] S5. Determine the optimal thickness while satisfying durability and geometric constraints;

[0017] S6. Output the mold processing parameters and manufacturing tolerances that match the optimal thickness, and generate a design report that includes the magnification factor spectrum and position migration distribution.

[0018] Preferably, the formula for calculating the stress / strain amplification factor in step S2 is as follows:

[0019] ;

[0020] in: For slotted models at nodes The component value at the location; For slotless models at nodes The component value at the location; At least one principal stress Secondary principal stress Shear stress and corresponding principal strain , With shear strain ; This is the index of the sampling node at the bottom of the trench.

[0021] As a preferred embodiment, the formula for calculating the extreme value location migration in step S3 is as follows:

[0022] ;

[0023] in: is the geometric position vector of the node; For the grooved model in components Extreme value node index; For slotless models in components Extreme value node index; This represents the Euclidean norm.

[0024] As a preferred method, the optimization method for step S4 is as follows:

[0025] ;

[0026] in: For thickness The objective function value; The weighting coefficients for each component are non-negative. For components The representative amplification factor; Weights for location migration; This is the weighted representative value for multi-component location migration.

[0027] As a preferred method, step S5 determines the optimal thickness as follows:

[0028] ;

[0029] in: The optimal thickness; For the thickness feasible region; These are the engineering constraint thresholds for the primary principal stress, primary principal strain, and position migration, respectively.

[0030] As a preferred method, the measurement of extreme position migration is based on the arc length parameter of the center line of the trench bottom, and the position migration is characterized by the difference in arc length along the center line to ensure the consistency of comparison under different grid divisions.

[0031] As a preferred option, the representative amplification factor Robust statistics were employed, with the preferred quantile being at least the 80th quantile, to reduce the impact of local grid singularities on the results; representative values ​​for location migration. A component-weighted average is used.

[0032] As a preferred approach, multi-condition collaborative optimization is considered, and the targets of different wheel loads, micro-slippage or low-speed rolling conditions are weighted and summarized. The weight of each condition is set according to the target product line (quiet comfort, all-weather or sport handling).

[0033] As a preferred option, the preferred thickness search strategy includes: when suppressing When scaling up is the priority, the thickness is preferably within a narrow range of around 1.0 mm; when suppressing... When magnification is the priority, the thickness is preferably within a narrow range of around 2.0 mm; when controlling the overall strain is the priority, the thickness is preferably no greater than 1.0 mm, and the resolution of the thickness deviation is increased accordingly.

[0034] Furthermore, the present invention also provides a sound insulation groove thickness optimization system for implementing the method, comprising:

[0035] The modeling module is used to generate 3D models of the tire tread groove bottom with and without sound insulation grooves, and to use the thickness of the sound insulation grooves as a reference. For parameterized variables;

[0036] The finite element solution module is used to solve the problem under static load conditions of nominal inflation pressure and nominal wheel load, and outputs the solution in the local coordinate system of the trench bottom. ;

[0037] The comparison and determination module is used to calculate the amplification factor on the same set of sampling nodes. Find the extreme nodes and obtain the extreme position migration. ;

[0038] The optimization decision module is used to determine the objective function. With respect to engineering constraint thresholds on thickness Perform optimization and provide ;

[0039] The report export module is used for outputting reports. The corresponding mold processing parameters, manufacturing tolerances, and design report.

[0040] As a preferred option, the comparison and judgment module performs point-by-point comparison of slotted and slotless models based on "same node mapping" to avoid evaluation bias caused by mesh differences, and records the location of the extreme value of each component and calculates the migration amount.

[0041] And / or, the optimization decision module can load preset strategy templates according to the target emphasis, including strategies such as "principal stress priority", "shear stress priority" and "overall strain priority" to adjust the weight coefficients and thickness search window and improve the engineering convergence speed;

[0042] And / or, the report export module generates traceable records containing amplification factor spectral distribution, extreme value location migration heatmap, and critical node index, and exports them to the process and mold system in structured data form.

[0043] As a preferred option, the feasible thickness region It also supports hybrid search of discrete candidate sets and continuous intervals. The discrete candidate sets preferably include 0.5mm, 1.0mm, and 2.0mm, while the continuous intervals are preferably 0.5–2.5mm. The results are formed using a robust statistical method after batch solving. and Input.

[0044] Furthermore, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method.

[0045] Furthermore, the present invention also provides a computer program product, including a computer program or instructions that, when executed by a processor, implement the method.

[0046] Furthermore, the present invention also provides the method for designing and obtaining anti-groove bottom cracking and low-noise new energy vehicle tires.

[0047] This invention, by employing the aforementioned technical solution, uses a unified metric of "same-node magnification factor and extreme value position migration" to measure the primary principal stress S at the bottom of the groove in both grooved and non-grooved areas. 11 Primary strain LE 11 and shear / lateral component (S) 22 S 12 LE 22 LE 12The amplification effect of ) and the arc length domain migration of new hotspots are explicitly incorporated into the joint objective and engineering threshold, thereby automatically obtaining the optimal groove thickness under multiple working conditions, so that S 11 LE 11 The high quantile value is controlled by a set upper limit and the transition of hot spots from the trench wall to the center of the trench bottom is suppressed, significantly reducing the probability of trench bottom crack initiation and improving durability consistency; at the same time, it also takes into account S 22 / S 12 To meet the requirements of handling stability and bulk stability, the noise reduction structure is maintained to suppress narrowband resonance / pump noise. High quantile robust statistics and arc length difference migration metrics are adopted to improve reproducibility across grids and projects. Finally, the thickness decision is directly mapped to mold compensation and manufacturing tolerance, forming a closed loop of "simulation-optimization-mass production". The dimensional capability (such as Cpk) and NVH / durability verification in the mass production process can be predicted forward and calibrated backward, thereby achieving synergistic optimization among noise reduction, durability and manufacturability. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the sound insulation groove structure.

[0049] Figure 2 Simulation design diagrams comparing the maximum stress at the bottom of the trench under different schemes.

[0050] Figure 3 Simulation design diagrams comparing the maximum strain at the bottom of the trench under different schemes. Detailed Implementation

[0051] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present invention.

[0052] This invention addresses the geometry of the "sound insulation groove" at the bottom of the tire tread groove, aiming to determine the thickness of the sound insulation groove without significantly increasing manufacturing complexity. To balance the noise reduction mechanism of the trench with the local durability constraints of the trench bottom, two sets of three-dimensional finite element models were established during implementation: one is a "baseline model" without the sound insulation trench, and the other is a "parametric model" with the sound insulation trench, where the trench thickness is... This is the sole or dominant optimization variable. Both models maintain the same geometric partitions and mesh seeds within the tread-belt-carcass range to ensure the repeatability of subsequent "same-node comparisons." The nominal working condition is a static load condition with rated internal pressure and nominal wheel load, employing rigid plate contact, hard contact normal, and penalty function tangential friction (dry or wet road surfaces can be used as additional verification). A unified local coordinate system (circumferential) is established at the bottom of the trench. Horizontal , legal direction ), and project the stress / strain tensor onto this coordinate system, hereinafter referred to as All refer to the component values ​​in this local coordinate system. Sampling points are selected along the centerline of the trench bottom with equal arc lengths, and points are also taken within the transverse microstrip to form a unified "trench bottom sampling node set". This provides a data baseline for subsequent point-by-point comparisons and determination of extreme value locations.

[0053] To quantify the impact of the sound insulation groove on the local response at the bottom of the trench, at the same sampling node Above, the "ratio of the same node" is calculated for the corresponding components of the two models with and without slots to obtain the magnification factor:

[0054] ;

[0055] Parameter definition: For nodes Location, thickness Lower component amplification factor; This represents the component value of the slotted model at this node; This represents the component value of the slotless model at this node; To avoid numerical divergence caused by an excessively small denominator, adjustments can be made during implementation. Set a minimum positive lower limit.

[0056] Regarding the determination of extreme value locations, the criteria are as follows: "no groove reference" and "grooved reference". "Locate each component in two states" The extreme node indexes are used, and the spatial migration of "new hotspots" is quantified using geometric coordinates:

[0057] ;

[0058] Parameter definition: For components In thickness Extreme position migration amount; The node's geometric coordinate vector; For the grooved model in components Extreme value node index; For slotless models in components Extreme value node index; It is the Euclidean norm. Preferably, it can also be the arc length parameter of the centerline of the trench bottom. The migration amount is represented by the difference in arc length within the domain to enhance the contrast consistency between different grids.

[0059] For engineering judgments, the representative value of the magnification factor is... The preferred method is to use the "maximum value or higher quantile not lower than P80" as the representative value for positional migration. The preferred approach is to use a "weighted average across components", which reflects both the worst-case scenario and statistical robustness.

[0060] Taking into account both the "magnification factor spectrum" (intensity / deformation risk) and the "hotspot migration risk," the construction thickness is determined. Joint objective function:

[0061] ;

[0062] Parameter definition: For thickness The objective function value; The weighting coefficients of each component are... It can be set according to product objectives (durability priority / handling stability priority / comfort priority); The weights for the location migration terms; For components The representative magnification factor (maximum value or P80 to P95 high quantile); This represents the weighted representative value of the multi-component location migration. The optimal solution for thickness is obtained under the condition of satisfying engineering constraints:

[0063] ;

[0064] Parameter definition: For thickness feasible region (e.g. 0.5–2.5 mm or discrete set containing 0.5 / 1.0 / 2.0 mm); These are the engineering thresholds for primary principal stress, primary principal strain, and position migration, respectively. When expanding the operating conditions, different wheel loads, friction, and temperatures can be weighted according to the product line to form a comprehensive target and judgment for multiple operating conditions.

[0065] To facilitate engineering interpretation, the results of the same node for the three sound insulation groove thicknesses of "0.5mm, 1.0mm, and 2.0mm" and the "grooveless reference" are now presented as intuitive magnification factors (all are ratios of the same node, with the percentage increase in parentheses; the sign and direction are omitted when comparing S). 22 (Amplitude value)

[0066] 1) Stress components (local coordinates)

[0067] —S 11 :

[0068] 0.5mm: (+334%); 1.0mm: (+209%); 2.0mm: (+326%).

[0069] —S 22 (Amplitude value):

[0070] 0.5mm: (+1.37%); 1.0mm: (+1.00%); 2.0mm: (-1.19%).

[0071] —S 12 :

[0072] 0.5mm: (+87.6%); 1.0mm: (+93.9%); 2.0mm: (+95.0%).

[0073] 2) Strain components (local coordinates)

[0074] —LE 11 :

[0075] 0.5mm: (+263%); 1.0mm: (+290%); 2.0mm: (+251%).

[0076] —LE 22 :

[0077] 0.5mm: (+1.53%); 1.0mm: (+6.06%); 2.0mm: (+6.08%).

[0078] —LE 12 :

[0079] 0.5mm: (+0.34%); 1.0mm: (+0.12%); 2.0mm: (+1.01%).

[0080] 3) Extreme value location migration (qualitative judgment)

[0081] From the "Comparison of Locations with Maximum Stress / Strain" entry, we can see that after adding the sound insulation groove, S 11 With S 12 The point of maximum stress, and LE 11 The maximum strain points all appeared as "new hot spots" at the contact points of the sound insulation grooves at the bottom of the trench, migrating relative to the hot spots on the non-groove reference surface; while S 22 LE22 LE 12 The extreme values ​​of S remain essentially unchanged or change very little. Therefore, in this dataset, for S... 11 S 12 LE 11 have For the remaining components .

[0082] The following engineering principles can be derived from the above results: First, S 11 With LE 11 The amplification is most significant, making it a key component that must be constrained during thickness optimization; secondly, a 2.0mm thickness has the most significant impact on S. 22 The situation has eased somewhat (the amplitude has decreased slightly), affecting S. 12 Slightly disadvantageous; thirdly, LE 11 The overall strain increases with increasing thickness, thus validating the empirical conclusion that "the thinner the material, the smaller the overall strain." Fourth, the hotspot migration mainly occurs in S... 11 S 12 LE 11 Appropriate transfer weights need to be added to the objective function. .

[0083] The following are optimized implementation examples based on different engineering focuses.

[0084] 1. Test conditions and evaluation criteria (applicable to all cases)

[0085] Operating conditions: nominal inflation pressure and nominal wheel load static load grounding; establish a unified local coordinate system at the bottom of the trench and extract the same node results of the sampling nodes at the bottom of the trench.

[0086] Indicator: Primary principal stress S 11 Secondary principal stress S 22 Shear stress S 12 One main strain LE 11 Secondary principal strain LE 22 Shear strain LE 12 The "maximum value position" is used to determine whether new hotspots have emerged and whether their positions have shifted (qualitative).

[0087] Thickness candidates: 0.5mm, 1.0mm, 2.0mm, compared with their respective "grooveless reference" at the same node.

[0088] Table 1 Summary of results for the same node (bottom nodes, values ​​from the original data).

[0089]

[0090] Note: Each thickness has a different "grooveless reference," so the magnification factor needs to be calculated as a ratio to the corresponding reference. However, when comparing thicknesses laterally, directly comparing the absolute values ​​at the same thickness also has engineering significance (e.g., whose S...). 11 Smallest, whose LE 11 minimum etc.).

[0091] 2. Example 1 (Scheme of the present invention, S) 11 (Durability priority): Select 1.0mm.

[0092] Selection Criteria: The dominant parameters for the initiation of trench bottom cracks are the primary principal stress / principal strain near the trench bottom and its hot spot migration. This invention improves w in the joint objective. S11 With α (transfer weight), to "suppress S" 11 With "suppressing new hotspots" as the main objective, after comprehensively evaluating 0.5 / 1.0 / 2.0mm, 1.0mm was determined to be the optimal thickness zone.

[0093] Comparison and Results:

[0094] Compared to 0.5mm: S 11 It decreased from 0.740661 to 0.526599, a drop of 28.9%; LE 11 Slightly higher (0.119971→0.127705, +6.45%), but controllable within the threshold E1 of this invention; S 22 The amplitude change was minimal (-1.28701→-1.29456, +0.59%).

[0095] Compared to 2.0mm: S 11 Significantly lower (0.526599 vs 0.724402, 27.3% lower); S 22 It offers a slight advantage over 2.0mm (-1.25591 is closer to zero), but it's not enough to offset the S... 11 Increased fatigue risk.

[0096] Maximum value location: All three thicknesses will be at S 11 / LE 11 A new hotspot appears "near the groove contact area"; 1.0mm without introducing additional components, with the lowest S 11 This achieves the most effective suppression of "new hotspot intensity," thereby significantly reducing the probability of trench bottom crack initiation.

[0097] Technical Results Summary: To achieve the goal of "solving trench bottom cracks," a thickness of 1.0 mm minimizes the peak principal tensile stress, satisfying the requirements. and At the same time, maintain S 22 / S 12 Within a controllable range, the overall durability risk is the lowest.

[0098] 3. Comparative Example 1 (thinner groove, NVH friendly but not good for durability): 0.5mm was selected.

[0099] Results and limitations:

[0100] 0.5mm LE 11 The absolute value is the smallest among the three thicknesses (0.119971), which is beneficial for overall strain control and comfort; however, S 11 It is 0.740661, the highest among the three thicknesses, and S 12 It also rose significantly (0.583835), indicating a strong new hotspot at the bottom of the trough.

[0101] While this configuration has the advantage of suppressing overall strain with thin grooves, the principal tensile stress peak is too high, which is consistent with the risk of easy cracking at the bottom of the groove after adding grooves in practice, and does not meet the durability priority target / threshold configuration of the present invention.

[0102] Conclusion: As a comparative example, 0.5mm demonstrates advantages in the "noise reduction / strain" direction, but in the crucial S... 11 The indicators are the most unfavorable, and it cannot achieve the technical goal of "solving trench bottom cracks".

[0103] 4. Comparative Example 2 (thicker groove, favorable for transverse / shear stress but not ideal for principal tensile stress): 2.0mm was selected.

[0104] Results and limitations:

[0105] 2.0mm to S 22 There was a slight mitigation (amplitude from -1.27103 to -1.25591), consistent with the lateral / mass stability objective; however, S 11 The value reached 0.724402, significantly higher than 1.0 mm; S 12 Also high (0.603744).

[0106] LE 11 The value is 0.127188, which is higher than 0.5 mm and slightly lower than 1.0 mm, but the peak value of the principal tensile stress is still relatively large; at the same time, the new hot spot is still located in the "groove contact area", and the migration fact has not been fundamentally changed.

[0107] Conclusion: 2.0mm has a local advantage in handling stability, but it cannot achieve the overall goal of "noise reduction + crack resistance". It is used as a comparative example to prove the durability superiority of 1.0mm.

[0108] 5. Example 2 (Optional strategy of this invention, LE-preferred silent wire): Select 0.5mm

[0109] When the product line primarily targets "quiet / comfortable and low overall strain," this invention switches the weight to w. LEThe primary α is moderate, and a thickness of 0.5 mm is preferred. Its LE 11 Minimum (0.119971), LE 22 / LE 12 It is also close to the benchmark; to offset S 11 To mitigate the higher risk, this invention employs process fillets and micro-grooves in S6 to reduce localized stress concentration, and sets stricter factory release criteria and sampling frequency for A1. This example demonstrates that the framework of this invention can achieve trade-off optimization and manufacturing closed-loop according to strategy templates for different objectives.

[0110] 6. Example 3 (Optional strategy of this invention, lateral / shear priority handling line): Select 2.0mm

[0111] When the project focuses on the lateral / shear stability of the blocks, the weight is configured as wS 22 +wS 12 wS 22 +wS 12 wS 22 +wS 12 High, medium migration weight, resulting in a preferred size of 2.0mm: S 22 Slight easing, S 12 Approaching 1.0mm; for controlling S 11 The high side effects are addressed by combining the formulation and geometry (such as the groove bottom transition radius and groove chamfer) in S6 with mold compensation and local smoothing, and a criterion of "hot spots not migrating to the groove bottom center" is set on the durability test bench. This example demonstrates the advantages of this invention: "switchy strategies and implementable constraints".

[0112] 7. Conclusion

[0113] Comparison of 0.5 / 2.0mm: 1.0mm in the dominant parameter S of trench bottom cracking 11 The above decreased by 28.9% and 27.3% respectively, without introducing a significant S. 22 Deterioration, but overall durability is optimal;

[0114] Hotspot migration control: New hotspots appeared in all three thicknesses, but the 1.0mm thickness passed the lowest S... 11 The peak value achieves optimal suppression of "new hotspot intensity," meeting the technical objective of "preventing trench bottom cracking."

[0115] Framework versatility: When the target is shifted to "overall strain priority" or "lateral / shear priority", the present invention can switch weights and thresholds to obtain the optimal alternatives of 0.5mm and 2.0mm respectively. Through the mold / process compensation closed loop of S6, different product lines can achieve a quantifiable optimal balance between "noise reduction, crack resistance and manufacturability".

[0116] The foregoing description of embodiments of the present invention, through which those skilled in the art are able to implement or use the present invention, will be readily apparent to those skilled in the art. Various modifications to these embodiments will be readily apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novelty disclosed herein.

Claims

1. A low-noise new energy vehicle tire with anti-groove bottom cracking and its optimized design method, characterized in that, Includes the following steps: S1. Establish a 3D model of the reference tread without sound insulation grooves and a parametric model with sound insulation grooves, using the thickness of the sound insulation grooves as an optimization variable. Finite element analysis was performed under static load conditions of nominal inflation pressure and nominal wheel load, and a local coordinate system was set at the bottom of the trench to extract the stress and strain components of the sampling node set at the bottom of the trench. S2. At the same sampling node at the bottom of the trench, compare the models with and without trenches at the same node, and calculate the stress / strain amplification factor. , For components At the node Location, thickness is The magnification factor is relative to the datum without the groove; the formula for calculating the stress / strain magnification factor is as follows: ； in: For slotted models at nodes The component value at the location; For slotless models at nodes The component value at the location; At least one principal stress Secondary principal stress Shear stress and corresponding principal strain , With shear strain ; This is the index of the sampling nodes at the bottom of the trench; S3. Determine the extreme value positions of the aforementioned components, identify the extreme value nodes of the models with and without slots, and calculate the extreme value position migration amount. , For components In thickness Extreme position migration amount; S4. Amplification factor With location migration The integration is a joint optimization objective, and the thickness is considered. To perform optimization; S5. Determine the optimal thickness while satisfying durability and geometric constraints; S6. Output the mold processing parameters and manufacturing tolerances that match the optimal thickness, and generate a design report that includes the magnification factor spectrum and position migration distribution.

2. The method according to claim 1, characterized in that, The formula for calculating the extreme location migration in step S3 is as follows: ； in: is the geometric position vector of the node; For the grooved model in components Extreme value node index; For slotless models in components Extreme value node index; Represents the Euclidean norm; And / or, the optimization method in step S4 is as follows: ； in: For thickness The objective function value; The weighting coefficients for each component are non-negative. For components The representative amplification factor; Weights for location migration; This is a weighted representative value for multi-component location migration; And / or, the method for determining the optimal thickness in step S5 is as follows: ； in: The optimal thickness; For the thickness feasible region; These are the engineering constraint thresholds for the primary principal stress, primary principal strain, and position migration, respectively.

3. The method according to claim 2, characterized in that, The measurement of extreme position migration is based on the arc length parameter of the centerline of the trench bottom. The difference in arc length along the centerline is used to characterize the position migration to ensure the consistency of comparison under different grid divisions.

4. The method according to claim 2, characterized in that, Representative magnification factor Robust statistics were employed to obtain high quantiles, no lower than the 80th quantile, to reduce the impact of local grid singularities on the results; representative values ​​for location migration. A component-weighted average is used.

5. The method according to claim 2, characterized in that, Considering multi-condition collaborative optimization, the targets of different wheel loads, micro-slippage or low-speed rolling conditions are weighted and summarized, and the weight of the conditions is set according to the target product line. And / or, thickness search strategies include: when suppressing When scaling is prioritized, the thickness is in a narrow range around 1.0 mm; when suppression is prioritized... When magnification is prioritized, the thickness is within a narrow range of approximately 2.0 mm; when controlling overall strain is prioritized, the thickness is no greater than 1.0 mm, and the resolution of the thickness deviation is increased accordingly.

6. A sound insulation groove thickness optimization system for implementing the method of any one of claims 2-5, characterized in that, include: The modeling module is used to generate 3D models of the tire tread groove bottom with and without sound insulation grooves, and to use the thickness of the sound insulation grooves as a reference. For parameterized variables; The finite element solution module is used to solve the problem under static load conditions of nominal inflation pressure and nominal wheel load, and outputs the solution in the local coordinate system of the trench bottom. ; The comparison and determination module is used to calculate the amplification factor on the same set of sampling nodes. Find the extreme nodes and obtain the extreme position migration. ; The optimization decision module is used to determine the objective function. With respect to engineering constraint thresholds on thickness Perform optimization and provide ; The report export module is used for outputting reports. The corresponding mold processing parameters, manufacturing tolerances, and design report.

7. The system according to claim 6, characterized in that, The comparison and judgment module performs point-by-point comparison of models with and without slots based on "same node mapping" to avoid evaluation bias caused by mesh differences, and records the location of the extreme value of each component and calculates the migration amount. And / or, the optimization decision module can load preset strategy templates according to the target emphasis, including "principal stress priority", "shear stress priority" and "overall strain priority" strategies, in order to adjust the weight coefficients and thickness search window and improve the engineering convergence speed; And / or, the report export module generates traceable records containing amplification factor spectral distribution, extreme value location migration heatmap and critical node index, and exports them to the process and mold system in structured data form; And / or, thickness feasible region It also supports hybrid search of discrete candidate sets and continuous intervals. Discrete candidates include 0.5 mm, 1.0 mm, and 2.0 mm, while the continuous interval is 0.5–2.5 mm. The results are generated using robust statistical methods after batch solving. and Input.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the method according to any one of claims 1-5.

9. A computer program product, comprising a computer program or instructions, characterized in that, When the computer program or instructions are executed by a processor, they implement the method of any one of claims 1-5.

10. The method according to any one of claims 1-5 is used to design and obtain a low-noise new energy vehicle tire with anti-groove bottom cracking.

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