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CN-122020913-A - Trench bottom crack prevention low-noise new energy automobile tire and optimal design method and system thereof

CN122020913ACN 122020913 ACN122020913 ACN 122020913ACN-122020913-A

Abstract

The invention relates to the technical field of tire structural design, in particular to a ditch bottom crack prevention low-noise new energy automobile tire and an optimal design method and system thereof. The tire builds a combined optimization model with the thickness as a core variable by uniformly measuring and restricting the stress, the strain amplification effect and the extreme value position migration of a grooved/ungrooved model on the same groove bottom sampling node, determines the optimal groove thickness which can inhibit groove resonance/pumping noise, control groove bottom main stress and main strain amplification and avoid hot spot migration, and directly converts the result into mold parameters and manufacturing tolerance to form a manufacturable and reproducible design-manufacturing closed loop.

Inventors

  • ZHOU ZIYE
  • HOU DANDAN
  • HUANG JIWEN
  • XU XIAOPENG

Assignees

  • 中策橡胶集团股份有限公司

Dates

Publication Date
20260512
Application Date
20260403

Claims (10)

  1. 1. The utility model provides a prevent ditch bottom and split low noise new energy automobile tire and optimal design method thereof which characterized in that includes the following steps: s1, establishing a reference tread three-dimensional model without a sound insulation groove and a parameterized model with the sound insulation groove, wherein the thickness of the sound insulation groove is used as an optimization variable Carrying out finite element solution under the static load working condition of nominal inflation pressure and nominal wheel load, setting a local coordinate system at the bottom of the ditch, and extracting stress and strain components of a sampling node set at the bottom of the ditch; S2, on the same trench bottom sampling node, comparing the same node of the patterns with the grooves and the patterns without the grooves, and calculating the stress/strain amplification factor , As components At the node The thickness is as follows Magnification factor relative to the non-slotted reference; S3, judging the extreme value position of the components, identifying extreme value nodes of the patterns with and without the grooves, and calculating the extreme value position migration quantity , As components At the thickness of The extreme value position migration quantity below; S4, amplifying the factor Migration amount with position Fused to a joint optimization objective and applied to thickness Optimizing; S5, determining the optimal thickness under the condition of meeting the durability and geometric constraint; S6, outputting mold processing parameters and manufacturing tolerances matched with the optimal thickness, and generating a design report containing the amplification factor spectrum and the position migration distribution.
  2. 2. The method according to claim 1, wherein the stress/strain amplification factor of step S2 is calculated as follows: ; Wherein: at the node of the model with grooves Component values at; At the node point for a model without grooves Component values at; at least comprises primary principal stress Secondary principal stress Shear stress Corresponding principal strain 、 And shear strain ; Index of sampling node at bottom of ditch; And/or, the calculation formula for calculating the extreme value position migration quantity in the step S3 is as follows: ; Wherein: Is a geometric position vector of the node; In component for grooved model An upper extremum node index; in component for model without groove An upper extremum node index; representing the euclidean norm; and/or, the optimizing method in the step S4 is as follows: ; Wherein: Is of thickness Is set according to the objective function value of (1); Is a weight coefficient of each component and is non-negative; As components Is a representative magnification factor of (a); weights for location migration; A weighted representation of the multi-component position migration; and/or, the method for determining the optimal thickness in the step S5 is as follows: ; Wherein: Is the optimal thickness; Is a thickness feasible region; engineering constraint thresholds of primary principal stress, primary principal strain and position migration are respectively adopted.
  3. 3. The method of claim 2, wherein the measure of the extreme position shift is based on arc length parameters of the trench bottom centerline, and wherein the position shift is characterized by arc length differences along the centerline to ensure consistency of contrast under different grid divisions.
  4. 4. The method of claim 2, wherein the representative magnification factor The method adopts steady statistics to obtain a high score not lower than 80 th score so as to reduce the influence of local grid singular points on results, and the representative value of position migration A component weighted average is employed.
  5. 5. The method of claim 2, wherein targets of different wheel-load, micro-slip or low-speed rolling working conditions are weighted and summarized by considering multi-working condition cooperative optimization, and working condition weights are set according to target product lines; and/or thickness search strategies include, when to suppress The thickness is preferably in the narrow region around 1.0 mm when the amplification is preferential, when the amplification is to suppress The thickness is preferably in the narrow region around 2.0 mm when magnification is preferred, and preferably not greater than 1.0 mm when overall strain control is preferred, and the resolution of the discrete steps of thickness is correspondingly increased.
  6. 6. A sound insulation channel thickness optimization system for implementing the method of any one of claims 2-5, comprising: A modeling module for generating a tread groove bottom three-dimensional model without sound insulation grooves and with sound insulation grooves, and using the thickness of the sound insulation grooves A finite element solving module for solving under the static load working condition of nominal inflation pressure and nominal wheel load and outputting the partial coordinate system of the ditch bottom ; A comparison and judgment module for calculating the amplification factors on the same sampling node set And extreme value nodes, and obtaining extreme value position migration quantity ; An optimization decision module for determining the optimal decision according to the objective function Thickness versus engineering constraint threshold Optimizing and give ; A report deriving module for outputting Corresponding mold tooling parameters, manufacturing tolerances, and design reports.
  7. 7. The system of claim 6, wherein the comparison and determination module performs point-by-point comparison of the model with or without slots based on "same node mapping", avoids evaluation bias caused by grid difference, and performs recording and migration calculation for the position of extremum of each component; And/or, the optimization decision module can load a preset strategy template according to target emphasis, wherein the strategy comprises a main stress priority strategy, a shear stress priority strategy and a total strain priority strategy so as to adjust a weight coefficient and a thickness search window and improve the engineering convergence speed; and/or the report deriving module generates a traceable record containing the amplification factor spectrum distribution, the extremum position migration thermodynamic diagram and the key node index, and derives the traceable record to the process and mould system in the form of structured data; And/or, thickness feasible region While supporting a mixed search of a set of discrete candidates, preferably comprising 0.5mm, 1.0 mm, and 2.0 mm, and a continuous interval, preferably 0.5-2.5 mm, formed in a robust statistical manner after batch solution And (3) with Is input to the computer.
  8. 8. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the method of any of claims 1-5.
  9. 9. A computer program product comprising a computer program or instructions which, when executed by a processor, implements the method of any of claims 1-5.
  10. 10. The method of any one of claims 1-5 is designed to provide a new energy automobile tire with low noise and anti-bottom cracking.

Description

Trench bottom crack prevention low-noise new energy automobile tire and optimal design method and system thereof Technical Field The invention relates to the technical field of tire structural design, in particular to a ditch bottom crack prevention low-noise new energy automobile tire and an optimal design method and system thereof. Background The tread pattern grooves of the tire not only bear the functions of drainage, heat dissipation, ground grabbing, block compliance and the like, but also directly influence rolling noise and local durability. In the running process of the vehicle, the tread main groove and the road surface form an approximately closed or semi-closed airflow channel when entering the grounding area, and air in the groove is compressed, discharged and re-inhaled, so that air pumping noise and groove resonance noise are easily generated. To reduce such noise, the prior art generally implements attenuation of narrowband noise peaks by adding additional structures to the patterned groove region to alter the in-groove airflow conditions, acoustic impedance conditions, or equivalent resonant paths. For example, chinese patent No. CN204340561U discloses a noise-reducing tread groove structure, that is, a helmholtz resonator which is formed by a resonant cavity and a small hole channel and is connected with a main groove is disposed in a groove wall at one side of the main groove of the tire, and the two structures form a T-shaped structure, so that noise of the tread of the tire of the automobile is reduced by means of the noise-reducing effect of the helmholtz resonator. Meanwhile, in the prior art, a scheme of disturbing the direction of the compressed exhaust air flow and destroying the air vortex in the groove by arranging a plurality of small rectangular blocks and other non-smooth structures in the main groove so as to realize noise reduction is also provided, but the scheme brings the problem of inconvenient die manufacturing. That is, providing additional noise reduction structures around the sipe region is a common noise reduction concept in the art, but such structural designs typically require a balance between noise reduction and ease of manufacturing. For another example, non-patent document Fatigue Life Prediction of a Groove Bottom of Green All Steel Radial Rubber Tires（Kangyu Luo,Hao Kong,Zhanfu Yong, is published in Journal of Applied Polymer Science,2025, volume 142, article No. e57002, DOI: 10.1002/app.57002) discloses a study of tire groove bottom fatigue life. The document teaches that the tire groove area is prone to crack failure and that the groove bottom fatigue life is predicted based on finite element analysis and damage parameter evaluation. It is known from this document that the groove bottom belongs to a local mechanical sensitive area of the tread, and that the fatigue crack initiation is closely related to local stress and strain concentration. Therefore, when introducing new additional structures in the area of the tread grooves, in particular in the vicinity of the groove bottom, attention should be paid to its influence on the local mechanical state of the groove bottom and on the risk of crack initiation, in addition to the noise reduction effect. The prior art can be combined with the prior art, the noise reduction design of the prior tire pattern groove is mainly focused on changing the air flow state or acoustic resonance condition in the groove by introducing a resonant cavity, a microstructure or other additional structures in the groove region, so that the noise of the groove is reduced, and meanwhile, the analysis of the local stress and damage behaviors of the bottom region of the groove from the fatigue life angle is studied. However, the prior art lacks a systematic, unified disclosure of changes in the local mechanical response of the trench bottom after the introduction of the noise reduction structure, particularly the effects of trench bottom stress, strain amplification, and maximum stress zone migration. In particular, when a sound insulation groove, a resonant cavity or similar additional groove structure is arranged near the groove bottom, although the noise performance of the tire can be improved, the local section rigidity and the load transmission path of the groove bottom can be changed, so that a new stress concentration point or a strain concentration area appears in the groove bottom area, and the crack initiation risk of the groove bottom is increased. In the prior art, a method for performing point-by-point comparison on stress and strain in two states of an additional structure and a non-additional structure on the same trench bottom sampling node and comprehensively evaluating structural parameters by combining extreme value position migration conditions is not known. Therefore, in practical development, the thickness, the slot position or the size parameter of the noise reduction structure is often determined mainly by experi