共查询到15条相似文献,搜索用时 125 毫秒
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金属橡胶干摩擦阻尼系统动态性能分析方法的研究 总被引:5,自引:0,他引:5
以干摩擦阻尼系统动态性能表征方法的前期研究成果为基础,针对金属橡胶构件的非线性力学性能,分析了金属橡胶构件的干摩擦阻尼的成因,对金属橡胶干摩擦隔振系统的运动微分方程的建立与求解进行了探讨,将方程的数值解与试验结果进行了对比。结果表明,在建立金属橡胶干摩擦阻尼系统的运动微分方程时,可以直接采用非线性恢复力,而不采用当量粘性阻尼项。试验结果表明该方法具有足够的精度。 相似文献
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为了解基础隔震结构在地震作用下的性能状态,基于小波多尺度分析技术提出一种识别橡胶支座时变非线性恢复力模型的方法。首先,基于离散序列小波多尺度分析(multi-resolution analysis,简称MRA)理论,将橡胶支座时变非线性未知恢复力采用Daubechies小波多尺度分解的小波系数近似表达,将时变问题转化为时不变问题;其次,通过最小二乘法估计各尺度小波系数,将估计的小波系数进行重构获得橡胶支座的非线性恢复力;最后,进行数值模拟验证。数值算例表明,在上部结构刚度变化时,该方法可以准确识别出橡胶支座的非线性特性,同时也可以很好地识别出上部结构的时变刚度,验证了该算法的有效性和正确性。 相似文献
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Akira Okada Yasuhiro Okamoto Adam Clare Yoshiyuki Uno 《The International Journal of Advanced Manufacturing Technology》2014,70(5-8):1515-1521
In compression or injection molding of rubber products, small pieces of residual rubber often remain on the metal mold surface after releasing the product. This is caused by excessive localized adhesion to the mold surface. Therefore, cleaning of metal mold surface must be often performed, which results in longer molding cycle time, and the lifetime of metal mold is often reduced. In this study, the separation forces between molded rubber and metal mold surfaces are measured with a tensile tester to evaluate the releasability of molded rubber from the metal mold surface. Mold surfaces treated by various surface coatings and surface modification methods including EB polishing were tested and compared. Experimental results show that the separation force between molded rubber and metal mold surfaces depends on the true contact area between them and the chemical composition of the metal mold surface. The separation force decreases with a decrease in contact area. The chromium content at the metal mold surface significantly reduces the separation force. EB polishing is one of the most effective surface treatments for metal molds since the real contact area can be decreased while also decreasing the surface roughness of the tool surface in a short time. Electron beam melting is also shown to be an effective method of distributing chromium uniformly on the metal mold surface. 相似文献
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The wear mechanisms for metal being worn by nitrile rubber under boundary lubrication conditions were investigated. We examined the surface profiles of both metal and rubber with SEM, and studied the chemical states of the elements in both surfaces with XPS. The functional groups in the rubber were analysed with FT‐IR. Under the action of shear forces, the metal lattice was disordered and new dislocations were formed; as a result, the chemical activity of the metal was increased. The macromolecular chains of the nitrile rubber and the alkane chains of the mineral oil were broken at stress concentration sites. These broken macromolecular chains produced active macromolecular free radicals, which reacted with the activated iron atoms and iron oxides, and generated a metal‐polymer film on the metal surface. This metal‐polymer film was destroyed and removed by the action of the debris on the sliding surface. Thus the rubber wore away the metal. Under boundary lubrication conditions with mineral oil, the physical processes of wear of T10 steel by nitrile rubber are microcutting and surface peeling. 相似文献
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金属橡胶吸声降噪性能分析及试验研究 总被引:1,自引:1,他引:0
金属橡胶材料是以金属丝为原材料的特种弹性多孔材料,特别适用于高低温、大温差及腐蚀环境下的吸声降噪需要。本文分析了金属橡胶作为多孔吸声材料的结构特性、一般物理性能及吸声频率特性;利用驻波管法,试验研究了金属橡胶厚度、孔隙率、金属丝直径及背后空气层对其吸声降噪性能的影响,获得了各主要参数之间的相互关系曲线。结果表明金属橡胶具有良好的吸声降噪性能,能够满足现代消声器恶劣环境的吸声降噪需要。 相似文献
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Using the Mooney-Rivlin model, the contact force and thermal behaviour of a radial lip seal are studied numerically and experimentally as a function of the interference. The numerical and experimental results on the static contact forces show good correspondence with and without the garter spring. The FEM calculated results indicate that increased interference may increase the eracking of seal material due to the maximum contact stresses close to the contacting area of the seal lip and produce local separation between the seal lip and the shaft. Also a coupled thermal-mechanical analysis method will be a useful tool to predict the contact behaviour of rubber lip seals for small values of the interference. 相似文献