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本文简述了橡胶减振器的减振原理、减振橡胶的动态力学特性。通过对硅橡胶6001、乙丙胶8341、天然胶1104动态力学参数的测定及减振器性能参数的测定,证实了用减振橡胶的动态力学参数设计计算的准确性。通过计算绘制出三种不同橡胶减振垫在给定频率下的运动响应系数——温度曲线。通过它可以了解在不同温度下减振器的减振能力。进而提出橡胶减 相似文献
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《合成材料老化与应用》2017,(4)
为提高大型、重型装备运行寿命及可靠性,减振降噪设计已成为动力学设计中关注的重点。传统减振垫损耗系数低,减振效果及抗疲劳、抗老化能力都较差,失效后更换困难。作为高效、经济的阻尼减振降噪材料,橡胶具有高分子聚合物的性能,通常要根据产品的固有特性进行专业化设计。为了提高设计效率,进行事前性能预估,须对橡胶材料参数进行测定。在对某型防爆胶轮车柴油发动机的减振系统进行结构设计过程中,通过采用M350-10 k N阻尼材料实验机进行单轴向拉伸试验,获取了某种橡胶的C_(10)、C_(01)材料常数,将该常数值代入2参数Mooney-Rivlin模型,采用ANSYS有限元软件对设计出的筒状减振器性能进行了预估,理论分析结果对于指导设计起到了重要的作用,所设计产品经装机实车实验、煤矿井下工业性实验,结果表明:减振器性能稳定,使用寿命较原有传统减振器提高100%以上。 相似文献
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<正>橡胶减振垫具有衰减吸收高频振动和噪声,以及体积小、重量轻等优点,在机车和轨道交通减振方面得到广泛应用。通常情况下,橡胶减振垫在外界恶劣自然环境和车辆行驶过程中的周期机械应力影响下,使用一段时间后,在其受力方向会产生永久变形或是产生裂纹,甚至发生破坏,影响车辆运行的舒适性和安全性。为此,针对某轨道交通用橡胶减振垫开展了加速老化试验并作了寿命预测。 相似文献
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全文主要包括六个部分,即一减振橡胶的应用。二橡胶减振器的特点。三减振橡胶的力学特性。四减振橡胶的设计参数。五减振橡胶的一般评价。六减振橡胶的研究。较全面地叙述了减振橡胶材料及其制品的应用和研究状况。强调了动态力学研究的重要性,这种方法国外在研究和评价减振橡胶材料时已广泛应用。 相似文献
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Solid solutions of diphosphates of zinc and copper and of zinc and cobalt were synthesized from mixtures of pure diphosphates at temperatures up to 1000°C. Their X-ray diffractometry patterns varied continuously from one end member to the other. Solid solutions of orthophosphates of composition Zn3−x Cox(PO4 )2, with x = 0.4–1.6, were formed at temperatures up to 950°C; all exhibited the structure of γ-Zn3 (PO4 )2. Solid solutions of orthophosphates of composition Zn3−x Cux (PO4 )2 exhibited more-complex behavior. At 1000°C and copper contents of 20–80 mol%, a phase that is related to Cu3 (PO4 )2, termed here the "ε-phase," predominated. At 850°–950°C and in the region from 20 mol% to ∼33 mol% of copper, the solid solutions (the "η-phase") adopted the structure of graftonite. At 800°–900°C and 10–15 mol% of copper, the solid solutions exhibited a new structure (the "δ-phase"), which we found to be related to the mineral sarcopside. At temperatures 950°C, the solutions that contained 5–15 mol% of copper (the "β-phase") had the structure of β-Zn3 (PO4 )2, whereas at 800°–850°C, solutions with 5 mol% of copper (the "-phase") exhibited the structure of γ-Zn3 (PO4 )2. Attempts to synthesize Cu+ ZnPO4 and Cu+ Cu2+ Zn3 (PO4 )3 were unsuccessful. 相似文献
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为了提高油田的生产效率,设计最佳的油气集输处理的工艺流程,更好地完成油气水分离处理的任务。对油气集输工艺技术进行优化,发挥高效油气水分离处理设备的优势,提高油气水处理的质量,保证油气集输工艺顺利实施,获得最佳的油田产量外输。 相似文献
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建设创新型国家是我们中华民族的历史责任。“自主创新、重点突破、支撑发展、引领未来”的16字方针应当成为我们未来创新活动的指南。建设创新型国家把自主创新放在首位,并提出了引领未来的高标准要求。钢铁科技创新必须突出重点,抓住创新成果产业化这个关键,支撑起行业和国民经济的发展。 相似文献
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相比已经完善丰富的开采和勘探技术,油气的运输以及储存却仍然存在不足之处。我国对能源安全提出更加严格要求的同时,对区域经济的发展规划也有足够重视。因此,保障油气管道的安全则成为了我国能源安全战略的重中之重。在阐释油气管道现阶段在储运安全保障技术发展状况的基础上,分析了现存的问题及解决问题的手段,并指出未来可能使用的目标策略,为今后研究者提供一定程度上的借鉴经验。 相似文献
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膜的污染和劣化及其防治对策 总被引:25,自引:0,他引:25
较为系统地介绍了膜污染和劣化的定义和特点,因膜污染和劣化而造成的膜性能变化,以及如何预防、减少或清除膜污染和劣化的一些通用方法。 相似文献
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James L. White David G. Salladay David O. Quisenberry Donald L. MacLean 《应用聚合物科学杂志》1972,16(11):2811-2827
Gel permeation chromatographic (GPC) and thin-layer chromatographic (TLC) studies of polystyrene, polybutadienes (BR), and their copolymers (SBR) have been carried out. GPC primarily separates them on the basis of molecular size, and TLC, on the basis of composition. Methods of obtaining absolute molecular weight distributions for BR and SBR based upon variations of the Strasbourg Universal Calibration procedure are described. In particular, [η]–M relationships in both the GPC solvent (THF) and in a second solvent (toluene) were used; in addition, results of statistical mechanical calculations for \documentclass{article}\pagestyle{empty}\begin{document}$\overline {s^2 }$\end{document} (based on the assumption of negligible steric hindrance and freely rotating bonds) were applied. An experimental comparison of these methods was carried out, and use of the [η]–M relationships for both solvents was found to give satisfactory results. The predictions of the statistical theory were too low. A detailed study of polymer–solvent–gel interaction in the GPC unit was made through investigation of ternary phase equilibrium in the (polystyrene)–THF–(polymer) system. The polymers studied included BR and SBR with varying styrene contents. Experimental techniques for TLC separations of BR, SBR, and polystyrene according to the composition are described. 相似文献