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声发射(AE)技术能用来区分发生在受载材料内的不同损伤模式,而聚类分析能在无先验知识的情况下通过揭示数据内部结构对数据进行分类。声发射波形包含了丰富的声发射源信息,而常规的特征参数并不能满足深层次的声源识别要求。文章尝试从波形的频率分布特征、形状特征和强度特征三个方面分别选取小波变换能量特征系数、波形裕度因子和幅值作为描述声发射波形的新参数。基于波形新参数的聚类分析能有效地区分加氢反应器材料2.25Cr-1Mo带裂纹和无裂纹试件拉伸过程中屈服阶段塑性变形信号、微裂纹扩展信号和断裂失稳信号。 相似文献
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采用橡胶加工分析仪、动态热机械分析仪等手段,从加工性能、物理机械性能、耐磨性、Payne效应、动态力学性能等方面系统分析对比了不同牌号溶聚丁苯橡胶在轮胎胎面胶中的应用效果。结果表明,使用牌号为SL 563 R、NS 616和SSBR 2300的溶聚丁苯橡胶所制备胎面胶的加工性能较好,SSBR 2353的硫化速率较快,HP 755 R的硫化速率较慢;RC 2564 S和NS 616的耐磨性较好;SL 553 R、SE-3231、SSBR 2353和SSBR 2300可用于低温轮胎胎面胶的开发;HP 755 R的抗湿滑性能最好;NS 616、SE-3231和SL 563 R可用于要求综合性能较好的配方中;RC 2564 S和SSBR 2300不适用于制备夏季胎胎面胶。 相似文献
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A high-speed vacuum ultraviolet (VUV) imaging telescope system has been developed to measure the edge plasma emission (including the pedestal region) in the Experimental Advanced Superconducting Tokamak (EAST).The key optics of the high-speed VUV imaging system consists of three parts:an inverse Schwarzschild-type telescope,a micro-channel plate (MCP) and a visible imaging high-speed camera.The VUV imaging system has been operated routinely in the 2016 EAST experiment campaign.The dynamics of the two-dimensional (2D) images of magnetohydrodynamic (MHD) instabilities,such as edge localized modes (ELMs),tearing-like modes and disruptions,have been observed using this system.The related VUV images are presented in this paper,and it indicates the VUV imaging system is a potential tool which can be applied successfully in various plasma conditions. 相似文献