摘要：For the inverse designs of centrifugal and mixed-flow pump impellers,clarifying the generation process of secondary flows and putting forward corresponding suppression measures is an important approach to improve the impeller *** this paper,to provide a better qualitative insight into the generation mechanism of secondary flows in the impeller,a simple kinematic equation is derived based on the ideal assumptions,which indicates that the potential rothalpy gradient(PRG)is the most important dynamic source that actively induces secondary vortical *** by the natural adverse PRG on the S1 and S2 stream surfaces,two typical secondary flows,H-S and P-S secondary flows,are clearly *** specially suppress these typical secondary flows,a general alternate loading technique(GALT)is proposed,aiming to adjust the real blade loadingδp to control the PRG *** the blade fore part,theδp on the hub streamline should be slowly increased to avoid breakneck growth of the potential rothalpy to reduce adverse streamwise PRG on the S2 *** the blade middle part,theδp should be moderately decreased to reduce adverse streamwise PRG on the S1 *** the blade aft part,the difference in theδp between the shroud and hub streamlines should be decreased faster to control the exit *** applying the GALT to the impeller designs of three typical pump types in hydraulic engineering,the organizational effect of the PRG on fundamental flow structures is *** GALT can effectively control the PRG distributions and suppress the secondary flows,thereby widening the pump’s high-efficiency zone,improving flow uniformity and suppressing pressure *** with the current Z-G method and the ALT,the GALT can meet the requirements of"de-experience"better,thereby enabling the designers to obtain good products explicitly and quickly.

摘要：针对洗煤厂浓介质制备和输送工艺自动化技术落后、不及时、岗位工操作频繁、劳动强度大等问题,设计了洗煤厂浓介制备与输送系统,解决现有洗煤厂加介系统人工干预的问题。通过与密度控制系统融合,可利用现有密度控制系统缺介指令判断是否需要加介和确定加介量,为实现智能化提供基础数据。

摘要：Fugitive dust has been recognized as an important contributor to air pollution,and artificial porous fence is one of the most effective management strategies to reduce fugitive dust in open *** improve the shelter effects and efficiency of Particulate Matter(PM)reduction of traditional fences,this study proposed five bionic fences and their capability was evaluated through wind tunnel *** results indicated that all of bionic fences presented better efficiency in reducing wind speed and PM concentrations compared with traditional fences,and they were more efficient in capturing *** the bionic fences,the non-woven cloth material with four-leave opening presented the best capability both in wind speed and PM *** proposed bionic fences may be further developed and studied for future application in capturing fine PM and adapting to the wind.

摘要：为解决选煤厂现有产品煤输送带安装位置和空间局限导致多种产品煤混合在一条输送带无法检测浅槽洗选精煤煤质的问题,进行选煤厂灰分检测辅材系统应用研究。通过定制化设计灰分检测辅材系统,对选煤厂2套浅槽系统1~50 mm粒级精煤进行交替检测,用于指导2套重介浅槽密度调控。解决了目前选煤厂精煤灰分无法检测、检测数据误差大、人工快灰化验时间长及放射源等问题。同时该系统具备对外通信接口,将数据远程输送至DCS系统,为重介分选系统的智能化提供基础数据。

摘要：主要对嵌入式控制系统在抗干扰方面提出了各种措施 ,包括电源、接地、隔离输入、输出通道 ,以及在电路设计上采取了措施 ,以求提高系统的抗干扰能力。

摘要：采用基于高阻硅的曲折线型(meander-line)介质超材料,设计了一种宽带的太赫兹四分之一波片,可以在较宽的频率范围内将入射的线偏振太赫兹波转换为圆偏振太赫兹波出射。三维全波模拟显示,通过恰当地设计超材料微结构的几何尺寸,可以调节微结构的双折射特性,进而改变沿微结构两个正交方向偏振的太赫兹波的透射振幅和相位,使之振幅相近(约0.55),相位相差90°。实验上,通过离子束刻蚀硅的方法按照设计加工了一个样品,并利用太赫兹时域频谱系统进行了表征。实验结果和模拟结果吻合得很好,实现了带宽在1.07~1.41 THz范围内有效的四分之一波片,对应的归一化椭圆率高达0.99,证实了该设计的有效性。此外,还通过改变微结构的几何参数,进一步在模拟上设计了两个在其他太赫兹波段工作的四分之一波片,证明了该微结构的可调谐特性。

摘要：针对民用飞机结构轻量化的高需求,本文介绍了民用飞机典型双耳接头3D打印设计制造一体化的流程及方法。首先通过工程算法对双耳接头进行静强度分析,并运用拓扑软件进行优化设计,经过有限元分析软件进行非线性仿真分析之后调整优化设计模型;然后进行静强度加载,验证接头的承载能力。初始接头质量为214.15g,承载能力(载荷/质量)为74.74N/g。优化后,接头质量为30.25g,减重85.87%;承载能力为231.37N/g,提升了209.57%。

摘要：本文提出了一种基于CAN总线的分布式停车场灯光智能控制系统的设计方案,介绍了该智能控制系统的软件、硬件设计方法。该系统具有结构简单、高可靠性、高性能价格比等特点,具有广阔的应用前景。

摘要：针对煤矿井下巷道掘进作业中锚杆支护环节存在的人工操作频繁、支护效率低等问题,研究设计了一种结构简单的煤矿钻锚机器人,提出一种自动钻锚单元。利用Solidworks三维建模软件构建钻锚单元中的钻锚装置和自动上料(锚杆)库模型,将建好的模型导入仿真软件ADAMS中,并且添加相应的约束和驱动等,通过对该模型进行运动学仿真分析,得出关键部件的运动学特性曲线,验证结构设计的合理性和可行性,为钻锚机器人的运动控制及其结构的优化设计提供参考依据。

摘要：蜂巢空腹楼盖技术是采用蜂巢芯在现浇混凝土板中铸塑成内部空间承力单元，形成传力明确的现浇混凝土双向网格肋空心楼盖水平结构体系。它的传力骨架是通过柱与柱（墙）之间实心暗梁或明梁，结合蜂巢空腹板工肋上下翼缘形成一个大的工字形截面梁，使其抗侧移刚度、位移、强度和变形等各方面均能满足设计要求。