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1.
陈理君  杨莉  刘波  陈霞  肖旺新 《橡胶工业》2009,56(10):615-619
针对纽斜节距轮胎花纹的特点,提出一种对花纹节距图像处理的新方法,并根据轮胎花纹发声机理建立相应的数学仿真模型,实现了花纹噪声的时域和频域分析,运用改进的免疫遗传算法编制相应软件对节距比例、节距序列和节距错位参数进行综合全局优化,从而为纽斜节距花纹轮胎低噪化分析评判和全局优化设计提供实用、先进的方法.  相似文献   

2.
低噪声轮胎花纹结构参数优化方法   总被引:10,自引:6,他引:4       下载免费PDF全文
在轮胎花纹低噪声优化原理及寻优方法研究基础上,重点论述了用模糊遗传算法(F-GA)对轮胎花纹的花纹块大小及比例、花纹槽大小及比例、节距排列、节距比例、错位及花纹条数八大参数进行优化的方法。通过寻优可得到多种低噪声轮胎花纹方案,再对其耐磨性、抓着力、美观程度等进行模糊综合评判,最终确定各项性能最佳的低噪声轮胎花纹方案。  相似文献   

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张超  束永平 《轮胎工业》2016,36(6):327-330
以12.00R20全钢载重子午线轮胎原节距花纹为基础,设计出两种新节距花纹。将3种节距花纹以不同的方式进行组合,建立3种变节距花纹轮胎的有限元模型和一个用于结果对比的等节距花纹轮胎的有限元模型。利用Abaqus有限元软件对建立的轮胎有限元模型进行稳态自由滚动工况分析。结果表明,花纹节距对轮胎接地压力和胎体帘线Mises应力有一定的影响,从而为变节距花纹轮胎的设计提供参考。  相似文献   

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对待优化轮胎和对标轮胎进行通过噪声测试,基于轮胎噪声的频谱特性及Colormap图,分析发现待优化轮胎的噪声频谱中存在明显的噪声峰值。通过专业的理论和分析工具诊断出该峰值主要是由花纹节距设计及排列不佳引起,最后采用节距优化理论对待优化轮胎花纹节距进行重新设计和排列优化,优化后轮胎的通过噪声测试结果及频谱特性分析表明,优化后轮胎的噪声峰值得到消除,声压级达到对标轮胎水平,且其噪声频谱与对标轮胎在相同试验条件下更为接近,验证了频谱分析法在轮胎噪声源诊断以及噪声性能优化方面的重要作用。  相似文献   

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利用轮胎胎面花纹噪声分析软件和云平台进行低噪声胎面花纹优化设计。在花纹设计过程中综合考虑花纹沟角度、花纹沟深度,采用横向窄沟槽设计,应用节距排列软件优化花纹节距排列,并通过花纹噪声分析软件对花纹进行轨道间错位值优化,结合云设计平台的产品测试数据库分析预测设计的胎面花纹可以达到低噪声水平。  相似文献   

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侯京斌  王婷婷 《橡胶科技》2020,18(7):0382-0385
采用光面胎花纹雕刻,研究胎面花纹设计对轮胎噪声的影响,分别考察花纹沟类型、横向花纹沟的深度和宽度、花纹节距、胎肩花纹沟开放形式和胎肩花纹沟角度的影响。结果表明:轮胎花纹是轮胎噪声的主要来源,可以通过优化胎面花纹结构来降低轮胎噪声;选择合适的花纹类型,优化花纹块(沟)的设计和花纹节距的排列顺序,选择合适的胎肩花纹沟开放形式和花纹沟角度均可以实现轮胎降噪。  相似文献   

7.
本文结合205/60R15 TL子午线轮胎设计工作,就高速轿车子午线轮胎的胎面花纹设计的特殊要求,花纹块和花纹沟的设计,节距的选择,节距排列顺序以及上下模型的错位等进行了探讨。胎面花纹设计应是不同花纹块和花纹沟的宽度比取无理数。花纹条数越多,降低噪声效果越好,但必须考虑轮胎的使用寿命和综合性能。花纹的节距应取无理数比较好,而且,节距的序列应为不等距无序排列。花纹应有合理的错位。  相似文献   

8.
朱振华  金基典  田颖  张敏  王建中  陈弘 《轮胎工业》2020,40(10):0579-0583
介绍轮胎花纹节距噪声计算方法,探讨节距噪声评判标准,并对不同规格和不同节距设计方案轮胎进行噪声性能趋势预判。结果表明,以节距噪声频谱一次谐波的能量集中因数和峰值作为节距噪声性能趋势的判据是合理的。在轮胎行驶面宽度和结构设计一致、花纹样式类似的前提下,可采用节距噪声仿真结果对轮胎噪声性能趋势进行预判。  相似文献   

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低噪声轮胎花纹的周期性和节距排列辨识   总被引:2,自引:2,他引:0       下载免费PDF全文
研究轮胎花纹的周期性和节距排列辨识方法。首先通过计算机扫描将轮胎花纹图案处理成[0-1]矩阵A,然后对矩阵A进行压缩计算,用以辨识轮胎花纹的周期性和花纹节距排列规律,为低噪声轮胎设计提供参考和分析工具。  相似文献   

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轮胎花纹辨识的主要任务是对花纹块、槽、节距、周期等识别。先识别花纹的周期性,然后在一个周期花纹上划分重复区域作为节距,得到各个节距之间的比例信息,运用轮廓提取和种子填充算法对轮胎花纹块进行辨识;通过循环向下搜索边界的办法查找出花纹槽的4个顶点,作出中心线,进而得到花纹槽的宽度、高度、倾斜角、弯曲度等结构参数信息。  相似文献   

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Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.  相似文献   

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In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.  相似文献   

14.
Glycidyl carbamate chemistry combines the excellent properties of polyurethanes with the crosslinking chemistry of epoxy resins. Glycidyl carbamate functional oligomers were synthesized by the reaction of polyfunctional isocyanate oligomers and glycidol. The oligomers were formulated into coatings with several amine functional crosslinkers at varying stoichiometric ratios and cured at different temperatures. Properties such as solvent resistance, hardness, and impact resistance were dependent on the composition and cure conditions. Most coatings had an excellent combination of properties. Studies were carried out to determine the kinetics of the curing reaction of the glycidyl carbamate functional oligomers with multifunctional and model amines. Detailed kinetic analysis of the curing reactions was also undertaken. The results indicated that the glycidyl carbamate functional group is more reactive than a glycidyl ether group. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, on October 27–29, 2004, in Chicago, IL.  相似文献   

15.
A highly moisture-proof polysilsesquioxane coating was obtained from a new bis-silylated precursor, which was synthesized from 3-aminopropyltriethoxysilane (APTES) and m-xylylene diisocyanate (m-XDI) in tetrahydrofuran (THF) and verified by 1H MAS NMR. For direct comparison purposes, an SiO2 coating was also prepared by the Stöber method using tetraethoxysilane (TEOS) as the reactant. Interestingly, the coating obtained from the polysilsesquioxane sol exhibited a much higher moisture resistance capability than its counterpart, which was attributed to its more compact feature between nanoparticles as characterized by N2 absorption experiment and transmission electron microscopy (TEM). Furthermore, its high transparency of about 92% showed potential for application in the protection of optical crystals.  相似文献   

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Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.  相似文献   

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