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对随机振动激励下橡胶减振器的减振机理进行研究,推导出橡胶减振系统的均方根(RMS)加速度响应计算公式,并研究了振动量级和胶料硬度对T形橡胶减振器(简称橡胶减振器)振动特性的影响。结果表明:橡胶减振器的传递率峰值随振动量级和胶料硬度的增大而减小;橡胶减振器的减振效率随振动量级的增大而增大,随胶料硬度的增大而减小;橡胶减振系统的RMS加速度响应理论值与试验值的误差绝对值较大,通过线性拟合并对理论值进行修正后,可以将误差控制在+5%以内。 相似文献
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针对钢丝绳减振器构造的复杂性和预应力及内摩擦力的不确定性,为有效模拟钢丝绳减振器静刚度,建立了钢丝绳减振器有限元分析模型,在实验基础上提出了虚拟材料本构关系的概念,考察了钢丝绳减振器缠绕偏角、缠绕宽度和缠绕圈数对三向静刚度的影响。结果表明:缠绕偏角对钢丝绳减振器的影响非常小;在同样的载荷条件下,缠绕宽度增加时,减振器的静变形增加,即静刚度有所降低;宽度对纵向和横向静刚度的影响趋势与垂向一致,但与垂向相比影响程度较小;减振器的静变形量随圈数的增加而减小,即静刚度增加。文章中的分析方法和所得结论,对于钢丝绳减振器的分析和设计具有一定的参考价值。 相似文献
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抗静电环氧树脂胶粘剂的制备与性能研究 总被引:1,自引:1,他引:0
以导电碳黑和银粉为导电填料制备了抗静电环氧树脂(EP)胶粘剂,考察了导电填料的种类和用量对胶粘剂导电性能和力学性能的影响。研究结果表明,导电填料的种类对胶粘剂导电性能和力学性能的影响显著不同;以导电碳黑作为导电填料时,当w(导电碳黑)=5.0%时EP胶粘剂开始具备抗静电能力,当w(导电碳黑)≈7.1%时胶粘剂的体积电阻率发生突跃式下降;而以银粉作为导电填料时,当w(银粉)=0~38%时EP胶粘剂不具备抗静电能力。EP胶粘剂的拉伸强度和剪切强度随着导电碳黑用量的增加呈线性下降的趋势,而随着银粉用量的增加则呈线性上升的趋势。 相似文献
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交联网络和填料网络的相互作用对SSBR/BR并用胶性能的影响 总被引:2,自引:0,他引:2
以溶聚丁苯橡胶C2557A和顺丁胶BR9000的并用胶为研究对象,通过改变硫磺/促进剂的的用量和炭黑(CB)的用量调整硫化胶中的化学交联网络和填料网络,研究了交联网络和填料网络的相互作用对硫化胶静态和动态性能的影响。结果表明,随着硫磺/促进剂用量的减少和CB用量的增加,混炼胶的焦烧时间和硫化时间逐渐缩短,硫化扭矩差增大;硫磺/促进剂和CB用量相同的硫化胶的Payne效应明显强于混炼胶的,即硫化胶的(G′0-G′∞)值大于混炼胶的(G′0-G′∞)值且随着CB用量的增大而更加明显,说明化学交联网络的形成对填料网络有一定的增强作用。 相似文献
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The effects of a quaternary ammonium salt, cetyltrimethylammonium maleate (CTMAM) on the curing characteristics and mechanical properties of carbon‐black‐filled natural rubber compounds are determined. Results indicate that CTMAM increases the rate of vulcanization to a maximum at 1 phr (part per hundred parts of rubber) followed by a decrease as the concentration of CTMAM is further increased. The incorporation of CTMAM also improves mechanical properties such as tensile and tear strengths, tensile modulus, hardness and resilience, whilst elongation at break shows a decreasing trend. CTMAM also improves filler dispersion and increases the extent of crosslinking of carbon‐black‐filled natural rubber compounds. © 2001 Society of Chemical Industry 相似文献
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橡胶减摆器的环境适应性研究 总被引:1,自引:0,他引:1
采用电液伺服试验机进行了橡胶减摆器高低温动态特性测试,研究了橡胶减摆器在不同温度环境下动态特性的变化规律,为其在高寒和热带地区的应用提供依据;同时对其湿热、霉菌和盐雾环境适应性进行了测试,为其在潮湿和海洋环境中的应用提供了依据。研究结果表明,当温度在-55~20℃之间时,橡胶减摆器的低温动态刚度与室温下的比值在1~1.7之间;当温度在20~70℃之间时,橡胶减摆器的高温动态刚度与室温下的比值在0.86~1之间;橡胶减摆器具有较好的高低温动态性能;湿热、霉菌和盐雾试验结果表明,橡胶减摆器的环境适应性优良。 相似文献
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当前我国国民经济飞速发展,随着人们对于出行要求的不断提高,汽车的数量也在快速增加。橡胶衬套广泛应用于汽车悬架,其能够很好的起到减震的作用,也能够大大提高汽车悬架的使用寿命。作为汽车悬架的重要部件,橡胶衬套的静刚度很大程度上会影响汽车的NVH性能,刚度越小减震效果越好,但容易引起共振带来抖动,反之,静刚度过大不利于隔离震动,因而对于橡胶衬套静刚度的测试分析十分有必要。合适的静刚度能够最大限度地提高车辆行驶的舒适性,也能够在一定程度上保证行车安全。以下就橡胶衬套静刚度的有限元分析与测试技术进行简要的分析研究。 相似文献
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Distributions of carbon black in 30/70% (w/w) natural rubber (NR)/acrylic rubber (ACM) blends were investigated as a function of the carbon black content and type using a dynamic mechanical thermal analysis (DMTA) technique. Two different types of carbon black (N220 and N330) were used, and 10–50 phr carbon black was compounded to the rubber blends. From the DMTA thermograms of various blends, the weight fractions of carbon black in the NR and ACM phases were calculated. Carbon black was unevenly distributed in the rubber blend. It preferred to migrate into the NR phase, regardless of the amount of carbon black that was used. By increasing the carbon black content, the weight fraction of carbon black in the NR phase decreased whereas that in the ACM phase increased. A change in the type of carbon black from N220 to N330 significantly decreased the weight fraction of carbon black in the NR phase, but it was not sufficiently strong to affect the tensile properties and hardness of the rubber blend. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102:248–256, 2006 相似文献
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硫化温度对NR高温下拉伸/撕裂性能的影响 总被引:2,自引:0,他引:2
采用74个不同的硫化温度硫化NR,并测试其高温下拉伸/撕裂性能、交联密度和炭黑分散情况。结果表明:随测试温度的提高,NR的拉伸强度和撕裂强度均呈现逐渐下降的趋势,且在同-测试温度下,硫化胶的拉伸强度随着硫化温度的升高而逐渐降低;在测试温度小于100℃时,硫化胶的撕裂强度随硫化温度的升高而逐渐升高,测试温度大于100℃时,硫化胶的撕裂强度随硫化温度的升高而逐渐降低。 相似文献
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介绍机车电动机橡胶减振垫产品的设计原理,指出产品的使用性能、各项指标及应用效果。结果表明天然橡胶与顺丁橡胶并用有较好的静动态性能,半补强炭黑与高耐磨炭黑并用可满足产品的强度与刚度要求。 相似文献
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The cure characteristics and physicomechanical properties of natural rubber (standard Nigerian rubber) vulcanizates filled with the fiber of bowstring hemp (Sansevieria liberica) and carbon black were investigated. The results showed that the scorch and cure times decreased, whereas the maximum torques increased, with increasing filler loadings for both bowstring hemp fiber and carbon black filled vulcanizates. The tensile strength of both bowstring hemp fiber and carbon black filled vulcanizates increased to a maximum at a 40 phr filler concentration before decreasing. The elongation at break and rebound resilience decreased, whereas the modulus, specific gravity, abrasion resistance, and hardness increased, with increasing filler contents. The carbon black/natural rubber vulcanizates had higher tensile strength, which was about 1.5 times that of bowstring hemp fiber/natural rubber vulcanizates. This superiority in the tensile strength was probably due to the higher moisture content and larger particle size of the bowstring hemp fiber. However, the bowstring hemp fiber/natural rubber vulcanizates showed superior hardness. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 相似文献