摘要：为研究软体致动器驱动特性及其仿生应用,采用对称结构形式设计了一种基于Kresling折痕图案的软体可折展致动器,可实现快速驱动,只产生轴向收缩而不发生扭转(即单自由度直线运动),兼具收缩比大和负载能力强等特点。基于功平衡原理并结合几何学理论对该软体可折展致动器进行理论建模与实验研究,探究其变形特性。结果表明:理论与实验结果基本吻合,收缩比随真空压力的增大而增大;在同一真空压力下,负载越大,收缩比越小;在相同收缩比下,负载越大,致动器所需真空压力越大。进一步分析了不同参数对致动器驱动性能的影响,在不同参数调节范围内,致动器的壁厚越小、相对角越小、边长越大,其收缩比、承载能力等性能越好。基于上述结果,优化设计出一种串联软体可折展致动器,将其安装在仿生拟人腿上,能够实现屈伸、跑步、踢球、吸附等不同功能。

摘要：Biomedical fracture fixation implants have complex sculptured geometries to adapt perfectly to fractured bones,making them difficult and expensive to manufacture with conventional machining methods. Fused filament fabrication(FFF) is a very popular Additive Manufacturing technology that simplifies the manufacture of parts with complex geometries, making it ideal for the manufacture of customized medical implants.

摘要：嘉绒藏族织绣工艺蕴含着丰富的文化内涵和艺术魅力,嘉绒藏绣非遗文化的创造性转化和发展能更好的保留传统文化记忆。通过文献调研法和案例分析法阐述嘉绒藏绣的纹样技法、风格特点及其当代应用,用设计学方法对嘉绒藏绣代表性纹样进行提取、分解、重构和再设计,并结合其典型的色彩和布局,融入当下文创市场流行的中青年女士化妆包中,验证嘉绒藏绣传统技艺活态化传承的可行性,拓展女士化妆包的设计创新路径。

摘要：A new ground-based expenmental device,the Space Plasma environment Research Facility（SPeRF）,is being designed at Harbin Institute of Technology in China,with Asymmetric Reconnection eXperiment-3 Dimensional（AReX-3D） as one of the experimental components to study the asymmetric reconnection dynamics relevant to the interaction between the interplanetary and magnetospheric *** asymmetry in the designed magnetic reconnection process not only refers to the distinct plasma parameters designed for the two upstream regions across the current sheet,but also refers to the inhomogeneity in the direction along the current sheet resulting from the designed 3D magnetic field *** two asymmetries are fundamental features of the reconnection process at the earth＇s *** experiment,the reconnection process is driven by a set of flux cores through coil-currentramp-up from the ＇magnetosheath-side＇ to interact with a dipole magnetic field generated by the Dipole Research experiment（DReX） coil on the ＇magnetosphere-side＇.The AReX-3D will be able to investigate a range of important reconnection issues in 3D magnetic field geometry that is relevant to the earth＇s magnetopause.A wide range of plasma parameters can be achieved through inductive plasma generation with flux cores on the ＇magnetosheath-side＇ and electron cyclotron resonance（eCR） with microwave sources on the ＇magnetosphere-side＇,***（low）plasma density at experimental magnetosheath（dipole） *** reconnection regimes and geometries can be produced by adjusting plasma parameters and coil setups as well as coil current *** three-dimensional magnetic field configurations in the SPeRF relevant to the dayside magnetopause reconnection are discussed in detail.

摘要：利用微波发泡法制备一种新型的功能性发泡缓冲包装材料,采用热场发射扫描电子显微镜及微机控制电子万能试验机对发泡淀粉基调湿材料的表观形貌及力学性能进行测试,探讨了淀粉含量、丙烯酸-丙烯酸钠混合溶液与丙烯酰胺质量比、丙烯酸中和度及初始水含量对发泡淀粉基调湿材料性能的影响。结果表明:当淀粉含量为10.5%wt、丙烯酸-丙烯酸钠混合溶液与丙烯酰胺质量比为4.5∶1、丙烯酸中和度为80%、初始水含量为10 g时,发泡淀粉基调湿材料的平台应力和缓冲系数分别达到0.363 MPa和3.618,单位体积吸收的能量为0.326 J/cm;发泡淀粉基调湿材料的吸/放湿率随淀粉含量的增加而降低,随丙烯酸-丙烯酸钠混合溶液与丙烯酰胺质量比、丙烯酸中和度及初始水含量的增加而增加。

摘要：目的设计用于测量CT机时间分辨力的方法和相应体模。方法根据环形伪影产生原理,使含有高密度衰减物的自制时间分辨力均匀体模与CT机架以同样的速度旋转,产生环形伪影,根据环形伪影的角度测量CT机的时间分辨力。结果当CT机架以0.5s/240°的扫描速度采集数据时,用自制体模测得CT机的时间分辨力为(0.5002±0.0014)s。结论实验设计的方法和自制体模可用于测量CT机的时间分辨力。

摘要：为研究介电弹性体发电机的发电特性,基于COMSOL有限元软件建立了在纯剪切拉伸方式下的介电弹性体发电机有限元仿真机电耦合模型。该模型基于Yeoh超弹性材料本构,同时耦合发电机膜内静电力,根据可变电容理论对发电机电容变化及发电效果进行研究。设计了可Y向预拉伸的纯剪切拉伸装置,并在不同预拉伸条件下对发电机薄膜样本进行了拉伸实验,分析了其电容变化及发电效果。对比了仿真数据与实验结果,仿真模型的电容变化与实验测得的电容变化情况基本吻合,仿真模型一个周期内的输出电压变化与实验测得的电压变化基本吻合。实验及仿真结果表明,在相同的拉伸条件下,Y向预拉伸增大了初始电容及电容变化速率,且当Y向预拉伸λ=1时的上升电压为83V,而λ=2时的上升电压达到252V,改善了发电性能。本文提出的介电弹性体发电机新的研究方法为发电机样机设计提供了新的思路。

摘要：针对我国能源消耗结构带来的环境问题,在现有太阳能资源和低温地板辐射采暖理论基础上,设计了家用小型太阳能低温热水地板辐射采暖系统。介绍了系统结构和工作原理,并以云南香格里拉气象条件为例对所设计的系统进行了实例计算,在采暖代表日,集热器与采暖房间的面积之比约为2:5。此系统具有较好的经济、节能、环保效益,具有良好的推广应用价值。

摘要：针对圆锯片的减振降噪拓扑优化设计,基于混合元胞自动机算法建立了以结构振动衰减、噪声降低为设计目标,以指定位置载荷力响应、位移响应为多约束条件的动力学拓扑优化模型,得到了满足刚度条件下锯片的最优开槽形式。将该优化锯片与普通锯片进行噪声分析比较,结果表明：优化结构在时域上降低了噪声声压级5～6 d B,在频域上明显降低了声压响应幅度、分散了声压能量,混合元胞自动机算法可为低噪声锯片的动力学拓扑设计提供新思路和理论支持。

摘要：A family of switched-capacitor based resonant converters is *** converters are in *** adding different number of switched-capacitor cells,different output voltage conversion ratio can *** switching devices in the converters operate under zero-current *** high frequencyoperations and high efficiency are possible.