轮胎花纹噪声的微机仿真发声

从轮胎花纹的时域波形中提取信息，运用16位PCM编码生成WAV格式的声音文件，用多媒体设备播放，并加入背景噪声，实现轮胎花纹噪声的微机仿真发声。试验证明，模拟噪声与实测噪声非常接近，多普勒效应十分逼真，为轮胎噪声主客观评价提供了经济的试验环境与有效的手段。     

Abnormal Vertical Dynamic Performance of Subway Vehicles

A serious wheel out-of-round phenomenon exists in a certain subway vehicle in China. More seriously, the vertical vibration of car body of this subway vehicle will go beyond the restriction of the standard criterion when the wheel out-of-round exceeds 0.2 mm in radial direction. And the wheel out-of-round problem could not be solved by polishing the rail or re-profiling wheels. Aimed at this problem, a further analysis is conducted on the structure and the suspension systems of the subway vehicle. It is thought that the additional stiffness function of the traction bar, caused by the short length and the bigger connection stiffness of the traction bar, leads to the problem that the subway vehicle is sensitive to the vertical impact. By taking into account the stiffness of the traction bar, dynamic simulation models of the subway vehicle are set up to study the influence of the additional stiffness function of the traction bar on the vertical dynamic performance of the subway vehicle through the simulation method. The response of the subway vehicle to vertical impact of a triangle pitch is also simulated. Simulation results indicate that the connection between the car body and the bogie will become rigid and the damping function of the secondary suspension will be decreased due to the additional stiffness of the traction bar in braking condition or running on curve track. Then the vertical response of the car body to vertical impact will be strengthened and the vertical ride index decreased. The vertical dynamic performance of the subway vehicle will be improved through the method of decreasing the connection stiffness of the traction bar, which has been validated by the simulation results. This method of improvement can effectively solve the problem of abnormal dynamic performance of this subway vehicle, and provide a foundation for a new theory about the traction bar system design.     

轿车子午线轮胎噪声探讨

介绍轮胎噪声的产生机理和测试方法,并探讨轿车子午线轮胎花纹对噪声的影响.减小花纹沟槽的深度、宽度和角度,采用斜向花纹块可降低轮胎噪声;为了使噪声的频率更加分散,需要将轮胎花纹设计成不同的节距,节距排列比率采用较大的无理数,且随机排列.室内噪声测试分析表明,光面轮胎噪声最低,花纹优化设计后的轮胎噪声明显低于普通花纹轮胎噪声.     

增塑体系对NR/TPI并用胶性能的影响

研究了增塑体系对NR/TPI并用胶物理机械性能和动态性能的影响。结果表明,NR/TPI并用比为85/15时,选用芳烃油较塑解剂B的增塑效果好;在NR/TPI并用胶中加入2～4份芳烃油,混炼胶硬度降低,粘性增加,门尼粘度适中,工艺上利于后续半成品的加工,而其硫化胶具有优异的耐磨性和动态性能,是一种较为理想的全钢子午线轮胎胎面胶。     

SSBR和ESBR胎面胶性能研究

研究炭黑或白炭黑补强溶聚丁苯橡胶(SSBR)和乳聚丁苯橡胶(ESBR)胎面胶的性能.结果表明,SSBR与白炭黑的界面作用强于ESBR;当采用白炭黑补强时,SSBR硫化胶的物理性能优于ESBR,而采用炭黑补强时,SSBR硫化胶的物理性能无明显优势;与炭黑补强SBR硫化胶相比,白炭黑补强SBR硫化胶的抗湿滑性能较好,滚动阻力较低,但耐磨性能较差,其中白炭黑补强SSBR硫化胶的抗湿滑性能最突出.     

炭黑分散剂HT-5在胎面胶中的应用

本文研究了炭黑分散剂HT-5在汽车胎面胶中的应用,试验结果表明：使用炭黑分散剂HT-5可以显著降低胶料的门尼粘度,延长焦烧时间,提高炭黑的分散性。在轮胎胎面胶配方中加入2.5份时,胶料的综合性能最好。     

Influence of interfacial compatibilizer,silane modification,and filler hybrid on the performance of NR/NBR blends

The effects of epoxidized natural rubber (ENR) as a compatibilizer, silane in situ modification, and filler hybrid on the properties of natural rubber/acrylonitrile–butadiene rubber blends were systematically studied. Phase change with the incorporation of ENR was quantitatively characterized via atomic force microscope quantitative nanomechanics technique. The results show that ENR could greatly reduce the dispersed domain size and increase the interfacial thickness; however, this compatibilizing effect reached the limit when ENR content was 5 parts per hundred rubber (phr). If the content is further increased, the redundant ENR start to gather at the interface and thus form a third phase. The macroscopic dynamic performance measurement was well in accordance with the microscale observation; the blend with 5 phr of ENR presented the lowest heat generation. The results also revealed that silane modification could significantly improve the overall properties, which benefited from better filler dispersal as evidenced by transmission electron microscopy. Finally, the effect of filler hybrid [silica and carbon black (CB)] was studied. It turned out that the blend containing 20 phr silica and 32 phr CB synchronously possessed high wet grip property, low rolling resistance, and high wear resistance, which makes it very promising for the high-performance tire application. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47421.     

特种工程胎硫化外胎质量缺陷原因分析以及解决措施

我公司使用的硫化机采用氮气定型,二次水硫化的工艺。由于特种工程胎胎体偏厚且大,成型机都比较大,生产过程中的帘布筒、钢丝、胎侧等部件都比较重且大。成型胎面使用胎面缠绕机缠绕,所以整个生产过程难度较大。特种工程胎硫化外胎的主要质量问题有:胎面皮泡、胎侧缺胶、胎侧泡、胎肩侧皮泡、子口内侧露线、子口缺胶、胎肚内缺(窝气)、胎肚露线、胎肚皮泡、胎肚串泡、子口支边、胎冠支边、子口鼓包、外胎花缺等。通过对特种工程胎硫化外胎质量缺陷原因分析,找到相应的解决措施,从而减少硫化外胎质量缺陷。     

均匀试验设计法在轮胎配方设计中的应用

均匀试验设计法是只考虑试验点在试验范围内均匀分布的一种试验设计方法，具有试验次数少、周期短、结果分析精确的特点；应用该设计法试验优选出来的配方完全达到了配方设计要求，当胎面胶中胶粉用量扩大到２０份后，胶料及成品胎的物理机械性能均较好，成品胎的耐久性能良好，实际行驶里程基本接近正常生产胎水平，并降低了胶料成本。     

拖拉机轮胎全SR胎面的研制

研究了用全ＳＲ制做７．５０－１６（人）拖拉机轮胎胎面。结果表明，胎面胶胶料生胶采用ＳＢＲ１５００／ＳＢＲ１７１２（６０／４０）或ＳＢＲ１５００／ＢＲ／ＳＢＲ１７１２（５０／３０／２０）并用体系均可；炭黑选用炭黑Ｎ３３９最好；软化剂选用芳烃油，用量宜较高；增粘剂选用ＲＸ－８０树脂。全ＳＲ胎面硫化胶的强撕性能、耐磨性能较好，成品轮胎性能符合国家标准，实际里程试验的花纹磨耗量低于现在生产轮胎。