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In the reliability analysis of complex structures,response surface method(RSM)has been suggested as an efficient technique to estimate the actual but implicit limit state function.A set of sample points are needed to fit to the implicit function.It has been noted that the accuracy of RSM depends highly on the so-called sample points.However,the technique for point selection has had little attention.In the present study,an improved response surface method(IRSM)based on two sample point selection techniques,named the direction cosines projected strategy(DCS)and the limit step length iteration strategy(LSS),is investigated.Since it uses the sampling points selected to be located in the region close to the original failure surface,and since it needs only one response surface,the IRSM should be accurate and simple in practical structural problems.Applications to several typical examples have helped to elucidate the successful working of the IRSM. 相似文献
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原油储罐加热方式选择 总被引:1,自引:0,他引:1
阐明了单井原油储灌几种加热方式的工作原理。对某一原油储灌加热装置进行方案设计,计算结果表明:同样温度下,蒸气与热水加热装置钢耗随换热管直径的增大而增大;提高蒸汽或热水温度,加热装置钢耗大幅降低;蒸气加热效果好于热水加热,但烟气直接加热是单井原油储灌最佳加热方式。 相似文献
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SHANG LiWei JI ZhuoYu CHEN YingPin WANG Hong LIU Xin HAN MaiXin & LIU Ming Key Laboratory of Nanofabrication Novel Devices Integration Technology 《中国科学:信息科学(英文版)》2011,(1)
Low voltage operating organic devices and circuits have been realized using atomic layer deposition deposited aluminum oxide thin film as dielectric layer. The dielectric film has per unit area capacitance of 165 nF/cm2 and leakage current of 1 nA/cm2 at 1 MV/cm. The devices and circuits use the small-molecule hydrocarbon pentacene as the active semiconductor material. Transistors,inverters,and ring oscillators with operating voltage lower than 5 V were obtained. The mobility of organic field-effect transis... 相似文献
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红掌又名大叶花烛,大红团扇,为天南星科花烛属多年附生常绿草本.红掌原产于南美洲的热带雨林中,性喜温暖、潮湿和半阴环境,但不耐阴,喜阳光而忌直射,不耐寒,喜肥而忌浓肥,宜选用排水透气性良好的基质,工厂化生产都用专业的进口基质加入适量的珍珠岩作为栽培基质.盆栽红掌的种植近几年在国内兴起,每盆花的市场零售价在60~80元不等,是人们在节日送礼的中高档花卉产品,在中国有很好的市场前景. 相似文献
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Lingzhong Du Chuanbing HuangWeigang Zhang Tiegang LiWei Liu 《Surface & coatings technology》2011,205(12):3722-3728
NiCr clad hexagonal BN powder (NiCr/hBN) was added to NiCr/Cr3C2 feedstock to improve the tribological properties of chromium carbide nichrome coating. The microstructure, flowability and apparent density of the composite powder, as well as the structure and mechanical properties of the plasma sprayed coating were characterized. The friction and wear behavior of the NiCr/Cr3C2-NiCr/hBN coating from ambient temperature up to 800 °C was evaluated on a ball-on-disk wear tester and compared with that of NiCr/Cr3C2 coating and NiCr/Cr3C2-NiCr/BaF2·CaF2 coating. The results show that NiCr cladding can reduce the decarburization of Cr3C2 and oxidation of hBN during the thermal spray. The main wear mechanisms of the NiCr/Cr3C2-NiCr/hBN composite coating are ploughing and adhesive wear. Layered hexagonal BN particle reduce the direct contact and severe adhesion between friction pairs, thus decreasing the friction coefficient. The NiCr/Cr3C2-NiCr/hBN composite coating shows a promising application in the high temperature environment with the request of both wear resistance and friction reduction. 相似文献
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基于时频分布的行星齿轮箱滚动轴承故障诊断研究 总被引:1,自引:1,他引:0
齿轮箱滚动轴承缺陷的两个主要特征不仅与频率有关,而且与时间有着密切的关系.如果单从时域或者频域分析滚动轴承的故障信号,很难获得故障信号的特征全貌.使用时间和频率的联合函数来表示信号,将联合时频分析引入滚动轴承的故障诊断,进行信号分析,会更符合实际.文中结合实例对行星齿轮箱滚动轴承的各种振动信号进行分析,结果表明,通过对信号作伪Wigner-Ville分布(pseudo-Wigner-Ville distribution,PWD),能形象、直观地反映出轴承故障的时-频域信息,而且对故障信息具有较强的判别能力,得到比较理想的诊断结果,为机械振动的非平稳时变信号的分析提供了方便可行的手段. 相似文献
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