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Development of and Perspective on High-Performance Nanostructured Bainitic Bearing Steel 预览
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作者 Fucheng Zhang Zhinan Yang 《工程(英文)》 2019年第2期319-328,共10页
Bearings are the most important component of nearly all mechanical equipment, as they guarantee the steady running of the equipment, which is especially important for high-end equipment such as highspeed trains and sh... Bearings are the most important component of nearly all mechanical equipment, as they guarantee the steady running of the equipment, which is especially important for high-end equipment such as highspeed trains and shield tunneling machines. Requirements regarding the quality of bearings are increasing with the rapid development in technology. A country’s bearings manufacturing level directly reflects the level of that country’s steel metallurgy and machinery manufacturing. The performance of the bearing steel is the critical factor that determines the quality of a bearing. The development of new bearing steel with higher performance is the ambition of material researchers and the expectation of the manufacturing industry. Many famous bearing manufacturing enterprises are competing to develop the new generation of bearing steel. Nanostructured bainitic bearing steel (NBBS), which is a newly developed bearing steel, not only possesses high strength and toughness, but also exhibits excellent wear resistance and rolling contact fatigue (RCF) resistance. In recent years, relevant achievements in NBBS in China have led to significant progress in this field. NBBS was first used in China to manufacture large bearings for wind turbines and heavy-duty bearings, with excellent performance. As a result, NBBS and its corresponding heat-treatment process have been included in the national and industry standards for the first time. The bearing industry considers the exploitation of NBBS to be epoch-making, and has termed this kind of bearing as the second generation of bainitic bearing. In this paper, the development of NBBS is reviewed in detail, including its advantages and disadvantages. Further research directions for NBBS are also proposed. 展开更多
关键词 NANOSTRUCTURED bainitic BEARING STEEL BEARING STEEL NANOSTRUCTURED BAINITE DEVELOPMENT
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稀土-镁复合处理对GCr15轴承钢中夹杂物的影响
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作者 常立忠 高岗 +1 位作者 郑福舟 施晓芳 《工程科学学报》 CSCD 北大核心 2019年第6期763-771,共9页
为了尽可能的去除钢中大颗粒的夹杂物,在实验条件下通过向GCr15轴承钢中添加适量镁、稀土对夹杂物进行改性,并利用Aspex夹杂物自动分析仪和扫描电镜对钢中改性后的夹杂物尺寸、类型、形貌等进行了观察、分析,研究了稀土-镁复合处理对夹... 为了尽可能的去除钢中大颗粒的夹杂物,在实验条件下通过向GCr15轴承钢中添加适量镁、稀土对夹杂物进行改性,并利用Aspex夹杂物自动分析仪和扫描电镜对钢中改性后的夹杂物尺寸、类型、形貌等进行了观察、分析,研究了稀土-镁复合处理对夹杂物的影响规律.研究结果表明,对轴承钢中加入微量镁处理,可将未进行镁处理钢中的MnS-Al2O3、MnS、Al2O3夹杂改性为以含硫、镁复合夹杂物为主,同时包含少量Al2O3、镁铝尖晶石夹杂.进一步采用稀土-镁复合处理后,钢中的夹杂物转变为主要以含Re-S-O夹杂物为主,Al2O3、MnS、镁铝尖晶石夹杂逐步消失,且夹杂物成球状分布,绝大多数夹杂物在5μm以下.稀土-镁复合处理轴承钢后,10μm以上的大颗粒夹杂物大大降低,钢中的夹杂物明显得到细化.钢中镁含量不变时,随着稀土含量的增加,大颗粒夹杂物比例明显下降.而在稀土含量相近的情况下,增加钢中的镁含量也有利于大颗粒夹杂物的去除.稀土-镁的相互作用进一步促进了夹杂物的细化. 展开更多
关键词 轴承钢 稀土 夹杂物 洁净钢
双蓄热步进梁式加热炉优化控制系统改造
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作者 虞学庆 彭红喜 +1 位作者 张守义 张范斌 《工业炉》 2019年第1期49-52,共4页
详细介绍了如何通过L1燃控和L2优化系统改造提升传统双蓄热式加热炉中弹簧钢、轴承钢等品种钢的加热品质,给出了实际应用效果,并对后续的改造提供了相关的见解,以期对国内同样类型的加热炉有一定的借鉴意义。
关键词 蓄热式加热炉 二级系统 脱碳控制 弹簧钢 轴承钢 工艺优化
高品质轴承钢生产工艺研究 预览
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作者 高鹏 丁志军 +1 位作者 高益芳 李世琪 《河北冶金》 2019年第10期51-53,共3页
为生产高品质GCr15轴承钢,河钢石钢对现有的60t转炉+LF+VD+CC工艺流程进行了技术研究及设备优化。通过严格控制原辅料中的钛含量和钢包的使用,进行炉后钢水扒渣操作,采用高铝系高碱度精炼渣,优化精炼过程参数及连铸设备优化改造等一系... 为生产高品质GCr15轴承钢,河钢石钢对现有的60t转炉+LF+VD+CC工艺流程进行了技术研究及设备优化。通过严格控制原辅料中的钛含量和钢包的使用,进行炉后钢水扒渣操作,采用高铝系高碱度精炼渣,优化精炼过程参数及连铸设备优化改造等一系列措施,产品氧含量可达6ppm以下,Ti含量≤13ppm的产品合格率达到95%以上,同时夹杂物不合比例在0.5%以下,实现了低氧洁净轴承钢的稳定生产,可为国内同类转炉工艺生产高品质轴承钢提供宝贵经验。 展开更多
关键词 轴承钢 精炼渣 原辅料 扒渣 氧含量 钛含量 夹杂物
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Effect of Prior Cold Deformation on the Stability of Retained Austenite in GCr15 Bearing Steel
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作者 Feng Wang Dong-Sheng Qian Xiao-Hui Lu 《金属学报:英文版》 SCIE EI CAS CSCD 2019年第1期107-115,共9页
In this work, the effect of prior cold deformation on the stability of retained austenite in GCr15 bearing steel was investigated after quenching and tempering treatment. The thermal stability was evaluated by calcula... In this work, the effect of prior cold deformation on the stability of retained austenite in GCr15 bearing steel was investigated after quenching and tempering treatment. The thermal stability was evaluated by calculating thermal activation energy for decomposition of retained austenite using differential scanning calorimeter. The mechanical stability was investigated according to the strain-induced martensitic transformation behavior of retained austenite under the standard compression testing. It is found that the prior cold deformation not only accelerates the carbide dissolution during the austenitization process but also contributes to the carbon partitioning in the tempering stage due to the higher density of phase boundaries, which results in the improvement of the thermal stability of retained austenite. Due to the enhanced carbide dissolution, the higher carbon content in the prior austenite will intensify the isotropic strain of martensitic transformation. As a consequence, the film-like retained austenite is likely to form under a higher hydrostatic pressure and thus shows a higher mechanical stability. Additionally, it is noteworthy that the benefits of the prior cold deformation to the stability of retained austenite would be saturated when the cold deformation degree is larger than 40%. 展开更多
关键词 GCR15 BEARING steel Prior cold deformation RETAINED AUSTENITE stability
轴承钢GCr15碳化物不均匀性金相分析与工艺建议 预览
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作者 李晟 《南钢科技与管理》 2019年第2期20-24,共5页
通过金相分析,简要介绍了轴承钢GCr15碳化物不均匀性的表现形式、分级判定、形成原因及应用危害;结合实际钢种CCT曲线及碳化物析出规律,探讨并提出了控制轴承钢GCr15碳化物不均匀性适宜的工艺路径与措施。
关键词 轴承钢 碳化物 金相 工艺
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GCr15轴承钢高温回火球化工艺研究
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作者 毕艳茹 《热加工工艺》 北大核心 2019年第20期164-166,共3页
研究了传统退火和固溶+高温回火球化预热处理对GCr15轴承钢碳化物及最终淬火+低温回火态轴承钢屈服强度、硬度的影响。结果表明:在本试验条件下,传统退火工艺处理的GCr15钢试样碳化物更为圆整,固溶+回火工艺处理的GCr15钢试样碳化物更... 研究了传统退火和固溶+高温回火球化预热处理对GCr15轴承钢碳化物及最终淬火+低温回火态轴承钢屈服强度、硬度的影响。结果表明:在本试验条件下,传统退火工艺处理的GCr15钢试样碳化物更为圆整,固溶+回火工艺处理的GCr15钢试样碳化物更为细小,随着回火温度和回火时间的增加,固溶+回火处理的GCr15钢试样组织中碳化物的尺寸逐渐增大,越来越均匀。经最终840℃×30 min油淬+180℃×2 h回火处理后,预处理工艺固溶+720℃×2 h回火的试样硬度为64.2 HRC,屈服强度为1843 MPa,与传统球化退火处理试样相比,分别提高了4.6%和11.8%。 展开更多
关键词 轴承钢 碳化物 退火 回火
轧后冷却速率对GCr15轴承钢球化组织的影响 预览
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作者 韩东序 杜林秀 +1 位作者 吴红艳 齐敏 《东北大学学报:自然科学版》 EI CAS CSCD 北大核心 2019年第10期1392-1397,共6页
采用电子探针和透射电子显微镜研究了模拟热轧后不同冷却速率对网状碳化物析出及后续离异共析转变过程中显微组织转变的影响.结果表明:在先共析碳化物形成温度区间采用快冷处理可以抑制网状碳化物的形成,减小片状珠光体的片层间距.当冷... 采用电子探针和透射电子显微镜研究了模拟热轧后不同冷却速率对网状碳化物析出及后续离异共析转变过程中显微组织转变的影响.结果表明:在先共析碳化物形成温度区间采用快冷处理可以抑制网状碳化物的形成,减小片状珠光体的片层间距.当冷速控为20℃/s时,采用离异共析处理方式可将球化退火时间降低约2 h,硬度可达1.95 GPa左右.选区电子衍射分析表明球化处理后的球状碳化物类型为M3C,冷速的调控不会改变球化处理后碳化物的种类. 展开更多
关键词 轴承钢 珠光体 球化退火 网状碳化物 硬度
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Carbides precipitation and their evolution of Cr15Co10Mo5-alloyed heat-resistant bearing steel after tempering at different temperatures
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作者 Mao-guo Xiao Xin-yang Lü +3 位作者 Dong-hui Li Shao-hong Li Kun-yu Zhao Mao-sheng Yang 《钢铁研究学报:英文版》 SCIE EI CAS CSCD 2019年第10期1096-1105,共10页
The carbides precipitation and their evolution at elevated tempering temperature in Crl5Col0Mo5-alloyed heat-resistant bearing steel were investigated by means of the transmission electron microscope.The results show ... The carbides precipitation and their evolution at elevated tempering temperature in Crl5Col0Mo5-alloyed heat-resistant bearing steel were investigated by means of the transmission electron microscope.The results show that there is no carbide precipitated from the martensitic matrix when the sample was tempered at 480℃.However,when the sample was tempered at 540℃,a large number of stable spherical M6C carbides precipitated in the test steel.Nevertheless,there are three types of carbides precipitated from the matrix including M6C,M2C and M23C6 carbides when the tempering temperature reached 600℃.The mechanical properties also present a correlation with the evolution of carbides during tempering at different temperatures.This indicates that the strengthening mechanism of the steel is main]y attributed to the precipitation of carbides and their evolution,including the morphologies and types of carbides at different temperatures.In addition,the austenitic layers with a thickness of about 30 nm have been obtained between the martensite laths after tempering at 600℃.The austenitic layers will produce transformation-induced plasticity effects to improve the toughness of the steel. 展开更多
关键词 High-temperature bearing steel Carbide evolution Phase diagram Diffusion coefficient Secondary hardening Austenitic layer
Effect of slag on oxide inclusions in carburized bearing steel during industrial electroslag remelting 预览
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作者 Shi-jian Li Guo-guang Cheng +2 位作者 Zhi-qi Miao Lie Chen Xin-yan Jiang 《矿物冶金与材料学报:英文版》 SCIE EI CAS CSCD 2019年第3期291-300,共10页
Industrial experiments with three types of slags were performed to investigate the effect of slag on oxide inclusions during electroslag remelting (ESR) process. G20CrNi2Mo bearing steel was used as the consumable ele... Industrial experiments with three types of slags were performed to investigate the effect of slag on oxide inclusions during electroslag remelting (ESR) process. G20CrNi2Mo bearing steel was used as the consumable electrode and remelted using a 2400-kg industrial furnace. The results showed that most inclusions in the electrode were low-melting-point CaO-MgO-Al2O3. After ESR, all the inclusions in ingots were located outside the liquid region. When the slag consisted of 65.70wt% CaF2, 28.58wt% Al2O3, and 4.42wt% CaO was used, pure Al2O3 were the dominant inclusions in ingot, some of which presented a clear trend of agglomeration. When the ingot was remelted by a multi-component slag with 16.83wt% CaO, a certain amount of sphere CaAl4O7 inclusions larger than 5 μm were generated in ingot. The slag with 8.18wt% CaO exhibited greater capacity to control the inclusion characteristics. Thermodynamic calculations indicated that the total Ca and Mg in ingots were attributed from the relics in electrode and strongly influenced by the slag composition. The formation of ingot inclusions was calculated by FactSageTM 7.0, and the results were basically in accordance with the observed inclusions, indicating that a quasi- thermodynamic equilibrium could be obtained in the metal pool. 展开更多
关键词 BEARING steel ELECTROSLAG REMELTING SLAG INCLUSIONS THERMODYNAMICS
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某型球轴承钢球划痕分析研究 预览
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作者 李鹏杰 袁同燕 《现代工业经济和信息化》 2019年第6期125-127,共3页
针对某型发动机试车后球轴承一颗钢球出现周向宽约(2~3)mm环状划痕且在环状划痕两侧对应分布一圆形划痕区域现象,开展了计量检测及分析,结果表明该钢球划痕现象是由于在某一特定工况条件下油膜失效产生的刚性接触。该轴承继续使用完成... 针对某型发动机试车后球轴承一颗钢球出现周向宽约(2~3)mm环状划痕且在环状划痕两侧对应分布一圆形划痕区域现象,开展了计量检测及分析,结果表明该钢球划痕现象是由于在某一特定工况条件下油膜失效产生的刚性接触。该轴承继续使用完成过补充试验,节约了试验资源,该分析方法对后续该类型轴承故检具有借鉴作用。 展开更多
关键词 球轴承 钢球 环带划痕 制造
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轴承钢残留奥氏体含量的测定方法及其应用
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作者 陈锟 刘琦 +2 位作者 刘克家 陈麒忠 陈惠芬 《金属热处理》 CAS CSCD 北大核心 2019年第5期206-210,共5页
将测量相转变的"比容差法"应用至轴承钢材料的残留奥氏体含量的精确测定。由轴承钢体积定量的测量,以标准的X射线衍射法进行校验,建立了轴承钢残留奥氏体含量-比容的关系线,由此根据比容差法来定量测量残留奥氏体相的含量。对... 将测量相转变的"比容差法"应用至轴承钢材料的残留奥氏体含量的精确测定。由轴承钢体积定量的测量,以标准的X射线衍射法进行校验,建立了轴承钢残留奥氏体含量-比容的关系线,由此根据比容差法来定量测量残留奥氏体相的含量。对GCr15轴承钢的测量实例表明:该方法可对轴承钢冷处理后的奥氏体转变量进行精确测量,建立的工作曲线表明,GCr15钢的残留奥氏体含量与比容之间可用线性关系表示。与X射线衍射法校验的测量结果相比较,两测量结果的偏差小于8%。 展开更多
关键词 比容差法 残留奥氏体 轴承钢 冷处理 相变
冶炼工艺对轴承钢氧含量的影响分析 预览
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作者 熊洪进 《特钢技术》 CAS 2019年第1期14-18,28共6页
本文将结合现场实际,从对轴承钢氧含量的影响因素进行了研究分析,研究表明:随着出钢碳含量的增加与钢液温度的降低,溶解氧含量也随之降低;在一定范围内,延长精炼时间,有利于改善脱氧效果;真空条件下,碳脱氧效率为10.9%;使用RH并增加纯... 本文将结合现场实际,从对轴承钢氧含量的影响因素进行了研究分析,研究表明:随着出钢碳含量的增加与钢液温度的降低,溶解氧含量也随之降低;在一定范围内,延长精炼时间,有利于改善脱氧效果;真空条件下,碳脱氧效率为10.9%;使用RH并增加纯脱气时间可进一步降低钢中的氧含量;钢中铝含量控制在0.010%~0.026%之间能够在操作和产品质量中达到一种平衡。 展开更多
关键词 轴承钢 氧含量 精炼
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过氧化氢对轴承钢化学机械抛光性能的影响 预览
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作者 王玉松 江亮 钱林茂 《轻工机械》 CAS 2019年第5期1-5,共5页
为了获取高完整性轴承钢表面,课题组采用化学机械抛光技术对轴承钢进行超精密加工;研究了过氧化氢对轴承钢化学机械抛光性能的影响以及材料去除机理。实验结果表明:在乙二胺四乙酸二钾盐存在的条件下,随着过氧化氢质量分数增加,轴承钢... 为了获取高完整性轴承钢表面,课题组采用化学机械抛光技术对轴承钢进行超精密加工;研究了过氧化氢对轴承钢化学机械抛光性能的影响以及材料去除机理。实验结果表明:在乙二胺四乙酸二钾盐存在的条件下,随着过氧化氢质量分数增加,轴承钢的抛光速率先急剧增大,然后逐渐减小并趋于稳定;而静态腐蚀速率先急剧减小然后趋于稳定;表面粗糙度Ra先急剧降低然后趋于稳定。结合电化学实验和X射线光电子能谱实验结果,轴承钢的材料去除机理描述如下:当过氧化氢质量分数较低时,轴承钢表面生成一层强度低、容易去除的反应层,包括铁氧化物和铁离子的乙二胺四乙酸络合物,抛光速率高;当过氧化氢质量分数超过0. 05%转折点并逐渐增加时,铁氧化物向三价态转变,表面反应层变得致密,强度增大,抛光速率减小,表面粗糙度降低。 展开更多
关键词 化学机械抛光 轴承钢 过氧化氢 超精密
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级别球用高端轴承钢线材脱碳层的研究 预览
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作者 信世奇 朱林林 +2 位作者 刘金池 张灵通 刘小成 《特钢技术》 CAS 2019年第1期42-44,共3页
通过对级别球用高端轴承钢线材脱碳层的研究分析,提出了高端轴承钢线材脱碳层的技术要求,研究了高端轴承钢连铸坯和线材工艺控制措施,以便于保证球级别球脱碳层具有良好的耐磨性、表面硬度及较高的疲劳寿命。经过研发及客户使用,研发的... 通过对级别球用高端轴承钢线材脱碳层的研究分析,提出了高端轴承钢线材脱碳层的技术要求,研究了高端轴承钢连铸坯和线材工艺控制措施,以便于保证球级别球脱碳层具有良好的耐磨性、表面硬度及较高的疲劳寿命。经过研发及客户使用,研发的级别球用高端轴承钢线材脱碳层指标均符合客户要求。 展开更多
关键词 级别球 轴承钢 脱碳层
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高端轴承钢精炼渣系的研究与纯净度的控制 预览
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作者 张良 张庆生 +1 位作者 刘菲 朱林林 《特钢技术》 CAS 2019年第2期29-32,共4页
通过对精炼过程Ti与钢中Al含量的变化趋势试图进行分析,并通过对比渣钢中Ti组元的变化,得到了轴承钢精炼过程Ti含量的变化规律,并实现最终Ti≤15ppm;通过对钢中全氧含量与渣中组元、渣碱度及渣系分布的关系研究,得到了高端轴承钢实现低... 通过对精炼过程Ti与钢中Al含量的变化趋势试图进行分析,并通过对比渣钢中Ti组元的变化,得到了轴承钢精炼过程Ti含量的变化规律,并实现最终Ti≤15ppm;通过对钢中全氧含量与渣中组元、渣碱度及渣系分布的关系研究,得到了高端轴承钢实现低氧所应具备的条件,并实现了了钢中T[O]≤8ppm,夹杂物控制在≤0.5级的水平. 展开更多
关键词 轴承钢 夹杂物 氧含量 精炼渣
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两相区退火过程中100Cr6钢碳化物的溶解行为
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作者 王军庆 孔德斌 +2 位作者 刘晓滕 韩洪文 李辉 《金属热处理》 CAS CSCD 北大核心 2019年第7期117-120,共4页
通过定量试验和计算,研究了100Cr6轴承钢两相区退火过程碳化物的溶解行为。用扫描电镜SEM和EBSD进行微观组织的观察和统计分析,并运用Thermo-Calc热力学软件和Dictra动力学软件计算分析两相区保温过程中保温时间对碳化物体积分数和平均... 通过定量试验和计算,研究了100Cr6轴承钢两相区退火过程碳化物的溶解行为。用扫描电镜SEM和EBSD进行微观组织的观察和统计分析,并运用Thermo-Calc热力学软件和Dictra动力学软件计算分析两相区保温过程中保温时间对碳化物体积分数和平均尺寸的影响。结果表明:以保温时间10min为临界点,初期碳化物粒子的溶解速率高,随保温时间的延长,溶解速率越来越低。保温60min后,碳化物粒子的直径由0.438μm降至0.281μm。随保温时间的延长,奥氏体内C含量提高明显,而Cr元素变化不大,只是在界面处建立了局部平衡。保温时间达到30min时,Cr原子在未溶解碳化物内发生了长程扩散,碳化物内的Cr含量明显提高,增加了其稳定性,降低了后续的溶解速率。 展开更多
关键词 轴承钢 碳化物溶解 微观组织 两相区退火
Effects of rare earth elements on inclusions and impact toughness of high-carbon chromium bearing steel
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作者 Chaoyun Yang Yikun Luan +1 位作者 Dianzhong Li Yiyi Li 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2019年第7期1298-1308,共11页
High-carbon chromium bearing steels with different rare earth (RE) contents were prepared to investigate the effects of RE on inclusions and impact toughness by different techniques. The results showed that RE additio... High-carbon chromium bearing steels with different rare earth (RE) contents were prepared to investigate the effects of RE on inclusions and impact toughness by different techniques. The results showed that RE addition could modify irregular Al2O3 and MnS into regular RE inclusions. With the increase of RE content, the reaction sequence of RE and potential inclusion forming elements should be O, S, As, P and C successively. RE inclusions containing C might precipitate in molten steel and solid state, but the precipitation tem perature was significantly higher than that of carbides in high-carbon chromium bearing steel. For experim ental bearing steels, the volume fraction of inclusions increased steadily with the increase of RE content, but smaller and more dispersed inclusions could be obtained by 0.018% RE content compared with bearing steel without RE, whereas the continuous increase of RE content led to an increasing trend for inclusion size and a gradual deterioration for inclusion distribution. RE addition could improve the transverse impact toughness and isotropy of bearing steel, and for modified highcarbon chrom ium bearing steel by RE alloying, the increase of RE content continuously increased both transverse and longitudinal im pact toughness until excessive RE addition. 展开更多
关键词 High-carbon CHROMIUM BEARING steel RARE earth INCLUSIONS Impact TOUGHNESS
磨削液对砂轮磨削轴承钢流体动压效应的影响 预览
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作者 宋晓萍 王优强 +1 位作者 赵晶晶 谢奕浓 《润滑与密封》 CSCD 北大核心 2019年第10期92-97,共6页
为了研究不同的磨削液对陶瓷刚玉砂轮外圆磨削轴承钢(GCr15)时的流体动压效应的影响,基于弹性流体动力润滑理论,建立稳态微观热弹流砂轮模型,对比分析水溶性磨削液、乳化液、油溶性磨削液、石蜡油磨削液对流体动压效应的影响,以及采用... 为了研究不同的磨削液对陶瓷刚玉砂轮外圆磨削轴承钢(GCr15)时的流体动压效应的影响,基于弹性流体动力润滑理论,建立稳态微观热弹流砂轮模型,对比分析水溶性磨削液、乳化液、油溶性磨削液、石蜡油磨削液对流体动压效应的影响,以及采用不同磨削液时磨削区的温度变化,并分析磨削液为乳化液时油相体积分数的不同对磨削区流体动压效应的影响。结果表明:无论是否考虑粗糙度的影响,采用石蜡油磨削液的整体压力最小,整体膜厚最大,而采用水溶性磨削液的磨削区温度要低于油溶性磨削液;综合考虑各种因素,选用乳化液作为磨削液,可获得较好的磨削效果和较低的表面磨削温度;乳化液的油相体积分数越大,整体压力越小,最小膜厚越大,但磨削区的温度上涨也越迅速;为保证磨削区温度不至太高,油相体积分数一般不超过20%。 展开更多
关键词 陶瓷刚玉砂轮 流体动压效应 磨削液 轴承钢
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A combined control strategy using tuned liquid dampers to reduce displacement demands of base-isolated structures: a probabilistic approach
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作者 Parham SHOAEI Houtan Tahmasebi ORIMI 《结构与土木工程前沿:英文版》 EI CSCD 2019年第4期890-903,共14页
This paper investigates a hybrid structural control system using tuned liquid dampers (TLDs) and lead-rubber bearing (LRB) systems for mitigating earthquake-induced vibrations. Furthermore, a new approach for taking i... This paper investigates a hybrid structural control system using tuned liquid dampers (TLDs) and lead-rubber bearing (LRB) systems for mitigating earthquake-induced vibrations. Furthermore, a new approach for taking into account the uncertainties associated with the steel shear buildings is proposed. In the proposed approach, the probabilistic distributions of the stiffness and yield properties of stories of a set of reference steel moment frame structures are derived through Monte-Carlo sampling. The approach is applied to steel shear buildings isolated with LRB systems. The base isolation systems are designed for different target base displacements by minimizing a relative performance index using Genetic Algorithm. Thereafter, the base-isolated structures are equipped with TLDs and a combination of the base and TLD properties is sought by which the maximum reduction occurs in the base displacement without compromising the performance of the system. In addition, the effects of TLD properties on the performance of the system are studied through a parametric study. Based on the analyses results, the base displacement can be reduced 23% by average, however, the maximum reduction can go beyond 30%. 展开更多
关键词 tuned liquid DAMPER lead-rubber BEARING system PROBABILISTIC framework steel SHEAR building RELATIVE performance index Monte-Carlo sampling
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