共查询到19条相似文献,搜索用时 125 毫秒
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轿车橡胶悬置元件安装于发动机固定支架与车架之间,它们不仅仅是简单的缓冲元件。如果这类悬置元件失效,则无法吸收车辆行驶中的颠簸,发动机运转时将发生整车振抖,严重影响汽车的正常行驶。 相似文献
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研究温度对纯胶发动机悬置和液封发动机悬置性能的影响、生胶和软化剂对硫化胶耐低温性能的影响以及耐低温改进配方胶料发动机悬置刚度变化。结果表明:随着温度的降低,纯胶发动机悬置和液封发动机悬置的刚度增大,液封发动机悬置阻尼特性频率段阻尼角减小;采用天然橡胶/顺丁橡胶并用胶、低倾点软化剂可改善硫化胶低温性能,提高发动机悬置的耐低温稳定性。 相似文献
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《塑料工业》2019,(4)
为提高复合材料汽车前罩刚度仿真精度,以高性能增强聚丙烯热塑性复合材料作为汽车前罩材料,通过Helius PFA软件将模流分析所得内外板纤维取向张量、残余应变结果映射至结构刚度分析模型,并添加非线性弹塑性材料建立多尺度联合仿真模型进行扭转刚度、前部弯曲刚度、后部弯曲刚度仿真,其仿真结果和传统仿真结果与实验结果对比分析。结果表明,基于多尺度联合仿真模型的仿真结果更贴近实验值,最小误差为3. 7%,最大误差为9. 5%,相对传统仿真方法误差最大减少17%,验证了多尺度联合仿真方法具有更高精度和可靠性。该方法可为同类复合材料注塑制品的结构设计优化提供参考和应用价值。 相似文献
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ABSTRACTThe present experimental study has been conducted to evaluate the impact of an acoustic enclosure of high-pressure oil pump, which is used to reduce the noise emission of an automobile engine. The enclosure is double-layered and made of nylon 66 (PA66) as an outer structure and polyurethane foam as the inner material. The sound signals of the engine were measured separately without an acoustic enclosure and covered by the enclosure. The signals were measured with 5 microphones around the engine under two electric loading conditions (0% and 100% load). The results revealed that the sound pressure level (SPL) of the engine increased significantly with the high-pressure oil pump installed, and the gap between SPL was larger for 100% load than 0% load. Furthermore, the enclosure of high-pressure oil pump was effective to attenuate the engine noise at almost the entire audio frequency range. The SPL reduced approximately 2?dB within nearly the entire test frequency range, supporting the remarkable noise reduction effect of the high-pressure oil pump enclosure. 相似文献
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To assess and predict the functional life of a natural rubber engine mount compound, the mechanical property changes were determined under accelerated aging conditions. The rubber was aged at temperatures ranging from 70 to 110°C for times ranging from 1 h to 5 weeks. Tensile and fatigue measurements were used to characterize the aging trends and mechanisms of the engine mount compound. With the time–temperature superposition approach, the activation energy was found to be about 98 kJ/mol for the elongation at break, 93 kJ/mol for the tensile strength, and 60 kJ/mol for the fatigue life. The tensile strength after aging for 13 weeks at 50°C was predicted to be 18.73 MPa, which was very close to the experimental value of 19.04 ± 2.25 MPa. With a 50% reduction in the tensile strength used as the failure criterion, it was predicted that the tensile strength of the engine mount compound would take 80 days to decrease by 50% at 70°C. At 23°C, it would last approximately 140 times (31 years) its lifetime at 70°C. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 相似文献
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大载荷下空间桁架结构主承力用碳/环氧推力管的重量优化设计 总被引:10,自引:2,他引:10
航天发动机推力支架空间桁架结构通常采用金属材料。碳/环氧复合材料用于这种空间桁架结构的主承力推力管可以显著减轻推力支架的重量。为了节约昂贵的实验费用,通常先对支架结构和重量进行优化设计。本文以橡胶芯模辅助RTM工艺制备的碳/环氧管件为模型建立了某种结构优化后的推力支架空间桁架结构的有限元模型,采用大型有限元分析软件ANSYS7.0对推力管的外径、壁厚和重量进行了优化设计,得出推力管最佳参数为外径7.8cm,壁厚2.23mm,总重11.58kg。 相似文献
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广研牌硅酮密封胶在汽车发动机上的应用研究 总被引:2,自引:0,他引:2
介绍了广研牌硅酮密封胶在汽车发动机上的应用情况,通过台架试验和道路试验表明在汽车发动机上采用广研牌硅酮密封胶是一项可行的工艺技术改进,能够提高发动机的密封可靠性和使用寿命,降低加工成本和产品成本。 相似文献
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二甲醚燃料汽车的研究和应用进展 总被引:1,自引:0,他引:1
从二甲醚燃料发动机的特性、二甲醚燃料的排放指标等方面论述了国外二甲醚燃料汽车的研发进程,介绍了国内在二甲醚燃料喷雾、燃料特性、发动机性能等方面的研究和应用。上海将成为国内首先推广二甲醚燃料汽车的城市。 相似文献
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介绍了一种汽车后保险杠左右支架塑料件的模具设计,首先分析了汽车后保险杠左右支架的形状结构和成型工艺难点问题,而后运用Moldflow进行了浇注系统有效性验证分析;CAE分析结果中,针对性地分析了充填时间、压力、平均温度、熔接痕、气穴位置等与注塑生产难点问题直接相关的结果,并给出了最终的注塑机试模参数,为模具结构设计提供了精确的设计依据;最后着重阐述了基于UG–HB_Mould6.6外挂的模具整体结构设计。此设计方法综合运用模具CAD/CAE技术,将生产经验和有限元分析技术有机结合,将模具试模前的潜在技术难题集中在设计阶段解决,提高了模具的生产效率。 相似文献
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结合汽车耐损、腐蚀和表面抗氧化要求,对采用等离子喷涂涂层进行修复再制造和强化的汽车部位的实践进行了总结。重点介绍等离子喷涂技术在汽车发动机上的实践应用,并针对汽车零部件等离子喷涂涂层应用现状提出了相应改进方法。 相似文献