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.
