由清华大学申请的专利(公布号CN 116296073A,公布日期2023-06-23)"轮胎瞬态失稳的处理方法、装置及存储介质",涉及轮胎振动分析技术领域,依据轮胎实时的多项行驶工况数据(包括滚动角速度、垂向载荷和动不平衡偏心力矩),将滚动角速度和垂向载荷输入瞬态动力学模型,得到轮胎瞬态失稳的动不平衡偏心力矩阈值,瞬态动力学模型用于反映轮胎滚动角速度和垂向载荷与动不平衡偏心力矩阈值的对应关系;在轮胎动不平衡偏心力矩大于或等于动不平衡偏心力矩阈值时,判定轮胎瞬态失稳.该发明充分考虑轮胎行驶工况和垂向载荷对轮胎瞬态动力学行为的影响,阈值确定结果更准确,可显著提高车辆的安全性和稳定性.
The application of silicon powder in shoulder pad compound of truck and bus radial tires was studied.The results showed that when silicon powder was used as a partial substitute for carbon black in shoulder pad,the processability and physical properties of the compound had little change,and the processing properties met the production requirements,while heat build-up and hysteresis loss were reduced.The high-speed performance and durability of finished tires met the requirements of national standards,and the rolling resistance was reduced.
Optimized design of 10.00-20 16PR A-3 pattern bias tire was carried out based on finite element technology.Based on the 10.00-20 16PR A-2 pattern bias tire,through finite element analysis verification,the goal of improving the durability of the tire while reducing its weight was achieved by improving the mold design(adjusting the crown arc from one segment to two segments and increasing the depth of the shoulder groove),adjusting the carcass cord ply,and optimizing the tread compound formulation.
The actual road fuel consumption of 12R22.5 CST113A low rolling resistance tire for commercial vehicle was tested,and the correlation between rolling resistance coefficient and fuel consumption was discussed.The test was carried out by comparing fuel consumption before and after installing fuel saving tires in the fleet,and the results were compared with domestic G brand tires.The whole vehicle was equipped with 22 tires,and the same vehicle of Oman GTL was used for cycle testing.During the test,the same driver would be assigned.The test route would be from Rongcheng Toll Station to Laixi Toll Station.One round trip would be considered as a valid test.Each group of tires would have two round trips.TPMS intelligent system was installed on the tires to monitor tire pressure,tire temperature and other information.V-BOX,infrared thermal imager and other test equipment were used for data collection.The results showed that,the fuel consumption per 100 kilometers of 12R22.5 CST113A low rolling resistance tire was 4.9 L,lower than that of G tire,with a reduction ratio of 11.9％.The correlation between tire rolling resistance coefficient and fuel consumption was deduced as follows:when the rolling resistance coefficient decreased by 10％,the fuel consumption decreased by 3.7％.
The design on 23.5R25 all-steel off-the-road radial tire for snow use was described.In the structure design,the following parameters were taken:overall diameter 1 592 mm,cross-sectional width 596 mm,width of running surface 530 mm,arc height of running surface 24.5 mm,bead diameter at rim seat 630 mm,bead width at rim seat 496 mm,maximum width position of cross-section(H1/H2)0.88,using the traction type horizontal pattern groove design,with 3D steel plates on the pattern block.In the construction design,the following processes were taken:tread using a special tread compound formula for snow tires,with 4-layer belt structure,3+9+15X0.22+0.15NT steel cord for 1#-3# belt layers,4X6X0.25HE steel cord for 4# belt layer,3+9+15X0.22+0.15NT steel cord for carcass,one-step building machine for building,single-mode steamer curing press for curing.The test results of the finished tires showed that the inflated peripheral dimensions,physical properties and durability met the requirements of corresponding national standards and enterprise standards.
Two production processes of the inner lining of truck and bus radial tires,the shaped roller calendering method and die extrusion method,were researched.The shaped roller calendering method had the advantages of excellent surface quality,strong dimensional stability,and high production speed of the inner lining,but it was not as good as the die extrusion method in terms of changing specifications,finished product defects,equipment maintenance,and tooling design and processing.The die extrusion method could achieve rapid change in the inner lining specifications and reduce costs.This study could provide a certain reference for the selection of production equipment for inner lining of truck and bus radial tires.
The image processing and convolutional neural networks(CNN)were used to establish a mathematical model between the tire pattern structure and the tire pattern noise values.The CNN model and BP neural network were used to predict the tire pattern noise values respectively,and the prediction accuracies of those two methods were compared.The results showed that,using the CNN model,the average absolute error between the predicted and measured tire pattern noise values was 0.591 dB,and the average relative error was 0.81％.Using the BP neural network,the average absolute error between the predicted value and the measured tire pattern noise value was 0.713 dB,and the average relative error was 0.95％.Compared with the BP neural networks,the CNN models had a higher prediction accuracy for tire pattern noise values.
Tire lateral stiffness and characteristic functions of force,as well as their applications,were introduced.The results showed that as the tire lateral stiffness increased,the required slip angle of the vehicle under any given lateral acceleration decreased,resulting in better handling stability of the vehicle.When matching the handling stability of tires and vehicles,the tire structure,pattern,and formula could be optimized through the characteristic values of tire lateral force coefficient,load sensitivity at the side slip angle of l°,and tire load transfer sensitivity at the side slip angle of 4°,and a reasonable design scheme could be selected.The larger the vehicle stability coefficient was,the better the understeer steering performance of vehicles was.
The application of environmentally friendly high strength recycled rubber in the hard apex of light truck and bus radial tires was studied.The results showed that,compared with the compound without adding environmentally friendly high strength recycled rubber,the curing characteristics and physical properties of the compound adding 10 phr of environmentally friendly high strength recycled rubber were basically unchanged.The HBay content of the compound met the requirements of EU standards.The high speed performance and durability of the finished tire before and after aging met the requirements of enterprise standards.The cost of the compound per kilogram was reduced by about 0.25 yuan,which had certain economic benefits.
The development of new tread pattern LP401 for port tires was introduced.The new tread pattern LP401 was suitable for high-end wear-resistant front suspension tires.It adopted the design of large pattern blocks,large angle of pattern groove bottom and middle rib of tire crown.It used the port-special formula tread compound,low heat build-up formula base compound and complex base adhesive technology,with adhesive sheets and the new sidewall marking design.The inflated peripheral dimension of the 18.00-25 40PR port tire with the new tread pattern LP401 met the requirements of the national standard,the durability far exceeded the requirements of national standards,the heat build-up performance could meet the operation requirements,and the service life was 37％longer than that of the competing tires,meeting the requirements of customers.
The influence of belt arrangement and molding methods on tire performance and carcass plysteer residual aligning torque(PRAT)were investigated.The results showed that adjusting belt arrangement and molding methods resulted in virtually no change in the inflated peripheral dimension,uniformity,strength,bead unseating performance,durability,low pressure durability and high speed performance of the tire,while the PRAT increased about 2 N·m.
This article introduced the workflow,existing problems,and improvement measures of the semi-automatic tire trimming machine with flap.By improving the inlet and outlet roller,setting up an anti-static soft brush device at the trimming station,improving the flap mechanism,and implementing variable frequency control measures for the active roller drive motor,the average trimming time of a single tire had been shortened from 12 s to 8 s.At the same time,the service life of the equipment was extended and the labor intensity of workers was reduced.
日前,由青岛黑猫新材料研究院有限公司和北京化工大学共同完成的"高性能炭黑/天然橡胶纳米复合湿法母胶关键技术开发"项目通过了由中国石油和化学工业联合会组织的科技成果鉴定.鉴定委员会一致认为,该技术具有自主知识产权,居国际领先水平,建议加大推广应用力度.
The application of environmentally-friendly zinc in the tread compound and sidewall compound of truck and bus radial tire was investigated.The results showed that,with the increase of the amount of environmentally-friendly zinc,the crosslinking density of the compound increased,the t90 was prolonged,and the anti-reversion property was improved.By replacing indirect zinc oxide with environmentally-friendly zinc in equal dosage,the processing safety and anti-reversion property of the compound were improved,the physical properties were good and the environmental pollution in the use of tires could be reduced.
The design on all position 325/95R24 enhanced truck and bus radial tires was introduced.In the structure design,the following parameters were taken:overall diameter 1 224 mm,cross-sectional width 318 mm,width of running surface 238 mm,arc height of running surface 7.5 mm,bead diameter at rim seat 612.5 mm,bead width at rim seat 228 mm,and maximum width position of cross-section(H1/H2)1.17.The tread adopted three longitudinal zigzag grooves,pattern depth 16 mm,block/total ratio 74.2％,and number of pattern pitches 64.In the construction design,the following processes were taken:The tread adopted a two-formula and two-piece through type base compound,using a 4-layer belt,of which the 1#-3# belt layers used 3+8×0.33ST steel cord,the 4# belt layer used 3×4×0.22HE steel cord,the carcass was made of 0.25+6+12 × 0.225HT steel cord.The enhancing layer of the bead chafer was an enhanced structure consisting of one layer of steel wire bead chafer and two layers of nylon fiber chafer,using one-stage mechanical reverse molding method to build tires and a steamer plate press to cure tires.The test results of the finished tire showed that,the inflated peripheral dimension,strength performance,static load performance and durability of the tire met the corresponding standards and design requirements.
2023年国际橡胶会议(IRC2023)暨第19届中国橡胶基础研究研讨会于2023年11月7-9日在中国海口隆重召开.原化学工业部副部长、中国石油和化学工业联合会原会长李勇武,中国中化控股有限责任公司副总经理、首席技术官、中央研究院院长张方,中国科学院院士骆清铭,中国工程院院士蹇锡高、瞿金平、王玉忠和张立群,英国皇家工程院院士Phil Coates和James JC Busfield,国际橡胶会议组织(IRCO)执行主席Michael Clayton,IRCO秘书长Matthew Thornton博士,中国石油和化学工业联合会副会长傅向升,中国化工学会副理事长兼秘书长方向晨,天然橡胶生产国协会(ANRPC)秘书长Toh Heng Guan,以及来自中国、美国、德国、英国、日本、澳大利亚、印度、泰国等20个国家和地区的相关行业专家学者、企业负责人、技术人员近千人齐聚一堂,同台交流.
The effect of the amount of coupling agent Si69 on the properties of the tread compound of steel-belted tire filled with multiphase carbon black G10 was studied,and the properties of the above tread compound were compared with that of the tread compound filled with carbon black and carbon black/silica.The results showed that compared with carbon black filled compound,the carbon black/silica co-filled compound had a larger Mooney viscosity,longer t90 and shorter t10.Compared with carbon black/silica co-filled compound,the Mooney viscosity of multiphase carbon black G10 filled compound was significantly reduced,t90 was shortened,the Payne effect of the compound was significantly weakened,the tensile strength of the vulcanizate was increased,the Akron abrasion and DIN abrasion were reduced,the compression heat build-up was significantly reduced,and the dispersion of carbon black in the compound was significantly improved.With the increase of the amount of coupling agent Si69 in the multiphase carbon black G10 filled compound,the vulcanization characteristics and physical properties of the compound changed little,and the loss factor decreased.The compound with the amount of coupling agent Si69 being 8％of the amount of silica had lower heat build-up and better dispersion of the multiphase carbon black G10 in the matrix.
2023年国际橡胶会议(IRC2023)暨第19届中国橡胶基础研究研讨会于2023年11月7—9日在中国海口隆重召开.原化学工业部副部长、中国石油和化学工业联合会原会长李勇武,中国中化控股有限责任公司副总经理、首席技术官、中央研究院院长张方,中国科学院院士骆清铭,中国工程院院士蹇锡高、瞿金平、王玉忠和张立群,英国皇家工程院院士Phil Coates和James JC Busfield,国际橡胶会议组织(IRCO)执行主席Michael Clayton, IRCO秘书长Matthew Thornton博士,中国石油和化学工业联合会副会长傅向升,中国化工学会副理事长兼秘书长方向晨,天然橡胶生产国协会(ANRPC)秘书长Toh Heng Guan,以及来自中国、美国、德国、英国、日本、澳大利亚、印度、泰国等20个国家和地区的相关行业专家学者、企业负责人、技术人员近千人齐聚一堂,同台交流.
