共查询到16条相似文献,搜索用时 109 毫秒
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轮胎花纹块撞击路面的噪声研究 总被引:2,自引:0,他引:2
在充分考虑轮胎胎面花纹块形状的基础上,结合声学基本理论,提出花纹块撞击路面噪声的预报模型,并推导出某方向m个花纹块产生的平均声压级计算公式:Lm=201g ρ0mSl3v^2/4ρ0πll2^2利用该公式对145/70R12和165/70R14轮胎花纹块撞击地面的噪声进行了计算。 相似文献
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根据轮胎花纹的发声机理,运用TNS/ODS噪声分析软件对185/55R14S-1200轿车轮胎花纹噪声的影响因素进行分析。综合模糊评判结果和M标准曲线目标函数分析表明:轮胎花纹沟与行驶方向的角度越小,噪声越低;花纹沟的宽度减小,轮胎整体花纹噪声降低;顺向花纹沟的噪声低于逆向花纹沟的噪声。 相似文献
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研究横向细沟槽对轮胎胎面花纹噪声的影响.结果表明,无论加刻什么类型的横向细沟槽,声压级都大幅升高;速度对声压级的影响程度大于负荷;在3种类型的横向细沟槽中,S形直沟槽噪声较小,且正、反转时声压级差异小;15°斜沟槽声压级较0°与15°交替排列沟槽略高,但0°与15°交替排列沟槽的正转和反转声压级差异较大. 相似文献
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载重轮胎9.00-20 16PR和10.00-20 16PR高速强载性能优化研究 总被引:1,自引:1,他引:1
对 9 0 0 -2 0 16PR和 10 0 0 -2 0 16PR载重斜交轮胎的结构设计、配方设计和工艺控制三个方面进行了改进。在结构设计方面包括减小行驶面宽度 ,外层及缓冲层裁断角度增大 1° ,增大帘布的反包高度 ,拉大各布层级差等 ;配方设计方面包括胎冠胶采用炭黑 /白炭黑补强体系 ,Si69、硫黄及次磺酰胺类促进剂的用量比为 1/1/1,胎肩胶中NR用量由 80份增大为 90份等 ;工艺控制方面改善裁断、压延工艺控制 ,调整硫化时间等。改进后轮胎的 15 0 %负荷耐久试验时间延长了 1倍 ,速度性能提高 相似文献
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Sang Yoon Park Won Jong Choi Chi Hoon Choi Heung Soap Choi 《Journal of Adhesion Science and Technology》2018,32(11):1200-1223
The effects of cure temperatures on the thermal, physical and mechanical characteristics of two types of thermosetting structural epoxy film adhesives were determined in detail. The aim of this paper is to assess the effect of cure temperatures (82–121 °C) on the degree of cure of the two adhesives and the relevant void formations that need to be addressed in bonded part production and repair. Two thermal parameters were used to characterize the advancement of the reaction, such as degree of cure and glass transition temperature. The joint properties with respect to the cure temperatures were characterized by void content and bond-line thickness measurements and lap shear strength tests. Experimental results presented that all lap shear strengths were well within minimum shear strength (29 MPa) required by the specification of the film-type adhesive. However, the lap shear strength testing after aging at 82 °C and 95%R.H for 1000 h showed that the improved durability when the adhesive is cured at 121 °C did not occur for the 82 °C cure. Low curing conversion (75–77% degree of cure) combined with high voids (over 2 areal%) has a catastrophic effect on the bonding qualities at the metal-adhesive interface and due to lack of cohesion in the adhesive. The changes in the interface caused by the low temperature curing may contribute to an increased susceptibility of the bonded joint to moisture and consequent bond-line degradation. 相似文献