为揭示纺织产品生命周期评价研究进展,以中国知网(CNKI)数据库和Web of Science核心数据库中纺织产品生命周期评价文献为数据源,对文献的发文量、发文作者和载文期刊等进行统计,并对文献中的核算产品、核算边界、核算数据和结果评价等...为揭示纺织产品生命周期评价研究进展,以中国知网(CNKI)数据库和Web of Science核心数据库中纺织产品生命周期评价文献为数据源,对文献的发文量、发文作者和载文期刊等进行统计,并对文献中的核算产品、核算边界、核算数据和结果评价等进行探讨。研究发现:2002-2020年纺织产品生命周期评价的研究文献数量整体呈上升趋势;中文文献中,东华大学的核心作者数量、发文量以及文献被引次数最多,英文文献核心作者集中于欧洲;《纺织导报》和Journal of Cleaner Production分别是中文和英文文献载文量最多的期刊;文献集中于天然纤维尤其是棉纤维类纺织产品的环境影响评价,对化学纤维类纺织产品的生命周期评价研究相对较少;纺织产品生命周期评价研究没有统一的核算边界和高质量的区域化数据库,评价指标体系尚未统一化和标准化。展开更多
The doubly curved shell(DCS)is a common structure in the engineering field.In a thermal environment,the vibration characteristics of the DCS will be affected by the thermal effect.The research on the vibration charact...The doubly curved shell(DCS)is a common structure in the engineering field.In a thermal environment,the vibration characteristics of the DCS will be affected by the thermal effect.The research on the vibration characteristics of DCS in thermal environment is relatively limited.In this paper,the thermal strain and the change of Young’s modulus caused by the changing of temperature are studied,and the DCS energy equation is established systematically.The displacement tolerance function of the DCS is constructed by the spectral geometry method,and the natural frequencies and mode shapes of the DCS with different structural parameters,such as thicknesses,ratios of R_(a)/R_(b) and a/b,at different temperatures are solved by the Rayleigh-Ritz method.The results show that the natural frequency of the DCS decreases with the increasing temperature,R_(a)/R_(b) and a/b ratios,and increases with the increasing thickness.展开更多
基金supported by the National Natural Science Foundation of China(No.51805341)the Natural Science Foundation of Jiangsu Province(Nos.BK20220500,BK20180843)+1 种基金the Jiangsu Funding Program for Excellent Postdoctoral Talent(No.20220ZB560)the Postgraduate Research&Practice Innovation Program of Jiangsu Province.
文摘提出一种统一的方法来预测环形板在稳态热环境下的自由振动行为。基于谱几何法(Spectral geometry method,SGM),采用改进的傅里叶级数展开环形板的位移。基于一阶剪切变形理论(First-order shear deformation theory,FSDT)得到了环形板的势能和最大动能。采用三组线性弹簧和一组旋转弹簧模拟环形板的任意边界,使用周向耦合弹簧以保证回转角为360°的圆环板周向边界的连续性,结合瑞利-里兹法构建环形板的理论模型,求解环形板的振动特性,通过与有限元(Finite element method,FEM)计算结果的对比,验证了该方法的准确性。本文采用无网格法,与目前主流的方法(如有限元法)相比,其计算效率更高。本文还研究了环形板的模态数值解和边界条件、内外半径比之间的关系。本文为环形板在工程实践中的应用提供了参考。
文摘为揭示纺织产品生命周期评价研究进展,以中国知网(CNKI)数据库和Web of Science核心数据库中纺织产品生命周期评价文献为数据源,对文献的发文量、发文作者和载文期刊等进行统计,并对文献中的核算产品、核算边界、核算数据和结果评价等进行探讨。研究发现:2002-2020年纺织产品生命周期评价的研究文献数量整体呈上升趋势;中文文献中,东华大学的核心作者数量、发文量以及文献被引次数最多,英文文献核心作者集中于欧洲;《纺织导报》和Journal of Cleaner Production分别是中文和英文文献载文量最多的期刊;文献集中于天然纤维尤其是棉纤维类纺织产品的环境影响评价,对化学纤维类纺织产品的生命周期评价研究相对较少;纺织产品生命周期评价研究没有统一的核算边界和高质量的区域化数据库,评价指标体系尚未统一化和标准化。
基金supported by the National Natural Science Foundation of China(No.51805341)the Natural Science Foundation of Jiangsu Province(No.BK20180843).
文摘The doubly curved shell(DCS)is a common structure in the engineering field.In a thermal environment,the vibration characteristics of the DCS will be affected by the thermal effect.The research on the vibration characteristics of DCS in thermal environment is relatively limited.In this paper,the thermal strain and the change of Young’s modulus caused by the changing of temperature are studied,and the DCS energy equation is established systematically.The displacement tolerance function of the DCS is constructed by the spectral geometry method,and the natural frequencies and mode shapes of the DCS with different structural parameters,such as thicknesses,ratios of R_(a)/R_(b) and a/b,at different temperatures are solved by the Rayleigh-Ritz method.The results show that the natural frequency of the DCS decreases with the increasing temperature,R_(a)/R_(b) and a/b ratios,and increases with the increasing thickness.
