摘要：The multi-pass scheduling method is a key issue in die-less spinning for determining the quality of the final products, including their shape deviations and wall thicknesses, and has drawn increasing interest in recent studies devoted to trying to improve the accuracy of the formed parts. In this paper, two main parameters, roller path profiles and deformation allocations in each pass, are considered in newly proposed multi-pass scheduling and optimizing methods in die-less spinning. Four processing methods with different roller path profiles and with three deformation allocation methods are proposed for investigating the influence of scheduling parameters on product qualities. The ＇similar geometry principle for restraining shape deviation＇ and the ＇small curvature principle for maintaining wall thickness＇ are presented for optimal design of roller path profiles; in addition, the ＇uniform allocation principle for maintaining wall thickness＇ and the ＇large deformation principle for restraining shape deviation＇ are brought forward as suggestions for deformation allocations. Based on these principles, a scheduling method denoted by RF＋（FP ＆ EHS） is presented to improve the comprehensive quality of a product of die-less spinning.

摘要：为了了解荞麦秸秆生物炭的理化性质,探究了不同温度与升温速率对荞麦秸秆热解特性的影响,通过差示扫描量热法、比表面积、孔径以及傅里叶红外光谱等检测揭示了荞麦秸秆生物炭的理化性质。结果表明:荞麦秸秆的差热曲线具有相似的变化,随着升温速率的增加热解反应向右偏移;炭得率与热解温度呈负相关;pH值、电导率逐渐增大(9.16~12.27、2.56~4.96 mS/cm);随着热解温度的升高,荞麦秸秆生物炭的表面官能团种类逐渐减少,并随着升温速率的增加伸缩振动增强;生物炭的比表面积与孔径体积随着热解温度的升高呈先增加后降低的趋势,但与升温速率不具有相关性,在较低温度时随着升温速率的增加孔隙结构逐渐由介孔为主过渡为大孔为主;不同热解温度下制备的荞麦秸秆生物炭的分形维数范围为[2.3709,2.9368]。综上所述,在热解温度700℃与升温速率12.5℃/min的条件下制备的荞麦秸秆生物炭,其结构稳定、比表面积最大且具有良好的炭得率,综合性质最佳。

摘要：随着海洋风电由浅海走向深海,固定式海洋平台逐渐被漂浮式海洋平台取代。鱼雷锚基础作为漂浮式锚泊系统的基础部件,克服了固定式锚泊系统在安装过程中依赖水深等特点,成为海洋风电走向深海的“主力军”。为研究鱼雷锚基础的拉拔特性,本文基于PLAXIS 3D有限元软件开展了鱼雷锚拉拔过程的数值模拟研究,分析了鱼雷锚贯入土体后的最终贯入深度、倾斜状态对拉拔位移和鱼雷锚变形的影响规律。研究结果表明,鱼雷锚的拉拔位移随贯入深度的增加而减小,并且对鱼雷锚进行倾斜可有效减小鱼雷锚的拉拔位移。该研究成果可为鱼雷锚的设计和安装提供有益的借鉴与参考。