摘要：基于计算流体动力学(CFD)方法,对调蓄池水力自清系统放空冲洗过程开展了数值模拟研究,分析了闸门开启时长和储水室水位高度变化对放空冲洗水流流动特性及调蓄池底部沉积物冲洗效果的影响规律,并构建了冲刷率与储水高度的非线性回归拟合公式。结果表明:放空冲洗的水流最大平均流速随闸门开启时长增加而减小、随储水高度增加而增大,放空冲洗水流的速度衰减主要发生在廊道前半段,放空冲洗后的廊道沉积物冲刷形态呈U形分布;放空冲洗的冲刷率随闸门开启时长增加而减小,在1.5 m储水高度下,当闸门开启时长由10 s增加至20 s时,冲刷率由46.27%减小为35.23%;放空冲洗的冲刷率随储水高度增加而增大,在闸门开启时长10s下,当储水高度由0.5m增加至2m时,冲刷率由4.83%增大到58.67%。

摘要：为了解决坚硬顶板难垮难落,从而造成采空巷道危险性增加的问题,对切顶卸压进行了数值模拟的研究分析。通过利用数值模拟软件FLAC3D对不同切顶角度下的切顶效果进行分析对比,确定出最佳切顶角度为10°。对最佳切顶角度下卸压效果进行分析,发现设计时应综合考量顶板岩性和切顶短臂结构的稳定性,当巷道处于低应力环境时,则更有利于巷道维持稳定性控制。

摘要：“输送和仓储技术”是上海电机学院中德合作物流管理专业的一门专业基础核心课程,由中德双方教师合作授课。在面向5届学生授课的过程中,双方在教学合作中不断交流探讨适合中德合作专业定位的课程教学内容、教学方法与考核方法,组建中德跨学科教学团队,基于工作过程导向开发系列教学案例,借鉴德国教学模式,形成以学生能力评价为目标的考核方式,建设工业4.0实验室,以智能制造产线物流为基础开发系列实验,将理论教学与车间物流工作过程相对接,提升了学生面向智能制造车间的物流方案设计与实务能力。

摘要：预测性维护通过及时诊断或预测设备状态来减少不必要的维护,深度学习方法可以从设备特征参数映射到设备的状态来实现上述过程。设备种类繁多与设备多工况时的预测性维护实现,对深度学习方法也提出了更高的要求,合理的选择深度学习方法是至关重要的。论文阐述了深度学习在预测性维护中的发展历程与最新应用,以期进一步推动预测性维护在更多设备上进行应用,提高预测性维护应用中深度学习方法的准确率,最后,对预测性维护中深度学习方法的未来发展进行了展望。

摘要：The formation problem of multi-agent systems via coordinated control is investigated,where the multiple agents can achieve the common velocity with leader and avoid collision during the *** the real-world situation,the communication is often disturbed and ***,the unknown disturbances are considered in the velocity measurements,which is assumed to be bounded and does not need to be ***,a complicated nonlinear interaction among agents is presented in the design of *** on the existing work of multi-agent systems,a flocking control protocol is proposed to address the formation problem in the dynamic *** stability analysis is given to prove that the velocities of all agents can converge to the velocity of leader and the stable motion with collision avoidance can be achieved ***,some simulations are presented to verify the effectiveness of the proposed algorithm.

摘要：In maxillofacial surgery, there is a significant need for the design and fabrication of porous scaffolds with customizable bionic structures and mechanical properties suitable for bone tissue engineering. In this paper, we characterize the porous Ti6Al4V implant, which is one of the most promising and attractive biomedical applications due to the similarity of its modulus to human bones. We describe the mechanical properties of this implant, which we suggest is capable of providing important biological functions for bone tissue regeneration. We characterize a novel bionic design and fabrication process for porous implants. A design concept of “reducing dimensions and designing layer by layer” was used to construct layered slice and rod-connected mesh structure (LSRCMS) implants. Porous LSRCMS implants with different parameters and porosities were fabricated by selective laser melting (SLM). Printed samples were evaluated by microstructure characterization, specific mechanical properties were analyzed by mechanical tests, and finite element analysis was used to digitally calculate the stress characteristics of the LSRCMS under loading forces. Our results show that the samples fabricated by SLM had good structure printing quality with reasonable pore sizes. The porosity, pore size, and strut thickness of manufactured samples ranged from (60.95± 0.27)% to (81.23±0.32)%,(480±28) to (685±31)μm, and (263±28) to (265±28)μm, respectively. The compression results show that the Young’s modulus and the yield strength ranged from (2.23±0.03) to (6.36±0.06) GPa and (21.36±0.42) to (122.85±3.85) MPa, respectively. We also show that the Young’s modulus and yield strength of the LSRCMS samples can be predicted by the Gibson-Ashby model. Further, we prove the structural stability of our novel design by finite element analysis. Our results illustrate that our novel SLM-fabricated porous Ti6Al4V scaffolds based on an LSRCMS are a promising material for bone implants, and are potential

摘要：The emblems of the Beijing 2022 Olympic and Paralympic Winter Games debuted in the National Aquatics Centre in Beijing on December 15, 2017. The emblems, which embodied traditional Chinese cultural elements, immediately caught the attention of people around the world. The emblems resulted from the wisdom of the design team, led by Lin, Deputy Dean of the School of Design, China Central Academy of Fine Arts (CAFA). The team's designs were chosen from among more than 4,500 designs.

摘要：旅游产品的开发实际上是特殊的产品生产,将都市旅游产品的生产融入创意理念,结合西安文化资源、科技创新、消费水平等方面的优势,从观光、时尚、乐活、艺术等层面开发创意十足的都市旅游产品,从本质上提升西安都市旅游产品的文化价值、经济价值和社会价值,形成都市旅游的创意氛围,最终使西安市成为具有创意感、艺术感、现代感的都市休憩旅游目的地。

摘要：将遗传算法(单目标遗传算法GA和多目标遗传算法NSGA-II、NCGA)与高效、高精度的空间推进方法———SSPNS(Single-Sweep Parabolized Navier-Stokes Algorithm)流场计算方法相结合,对二维高超声速进气道进行了气动优化设计研究。在单目标优化设计中以巡航点(Ma=7.0)的总压恢复最大为设计目标,多目标设计中则在巡航点分别考察了总压恢复最大-压升最大两目标模型、总压恢复最大-压升最大-阻力系数最小三目标模型。优化设计结果表明,单目标设计使得总压恢复有明显提高;多目标优化设计所得的Pareto最优前沿为设计者提供了可靠的设计依据。为了兼顾巡航点和加速爬升段的综合性能,采用多目标优化方法对进气道进行了多点优化设计,并开展了基于等动压弹道的设计点选择问题初步研究。计算结果表明,若将设计点选在Ma=6.5左右,则进气道的综合性能较好。

摘要：采用Fluent软件模拟超燃冲压发动机直联式地面试验用燃烧型加热器的内部流场,对设计的氢气多孔喷射和氢气单孔喷射方案分别进行了研究.计算结果表明:加热器出口流场均能满足设计总温为1 900 K,马赫数为1.85的要求,而氢气单孔喷射方案优于氢气多孔喷射方案.计算中也发现了这两种设计方案中存在的不足.