活齿端面谐波齿轮减速器虚拟样机的运动仿真

活齿端面谐波齿轮传动是综合传统的谐波齿轮传动和活齿传动的优点而发明的一种新型传动装置.在进行活齿端面谐波齿轮减速器虚拟样机三维建模及装配的基础上,基于Pro/ENGINEER软件机构仿真功能,实现了该减速器虚拟样机的活齿与端面谐波齿轮及端面齿轮的空间啮合运动仿真及动态分析.     

使用CAXA与Pro/E的渐开线椭圆齿轮三维建模与运动仿真

根据椭圆齿轮传动理论,分析了轮齿在节曲线上分布的特点,依据齿形折算法原理,以一个实例阐述了联合应用CAXA与Pro/E对椭圆齿轮进行三维实体建模.在此基础上构建了椭圆齿轮副运动仿真模型,实现了椭圆齿轮三维传动仿真,为进一步建立高速插秧机行星椭圆轮系分插机构仿真模型奠定了基础.     

基于Pro／E的弧齿锥齿轮参数化造型

利用Pro／E参数化设计的概念对弧齿锥齿轮进行了参数化设计,详细介绍了弧齿锥齿轮的造型方法,当修改齿轮设计参数时,系统可实现齿轮三维模型的自动更新．     

斜齿轮三维建模的探讨

本文阐述了基于Pro／E的斜齿圆柱齿轮设计的方法,该方法在Visualc＋＋7．0环境下利用C语言编写程序接口,可实现齿轮的优化设计及参数化造型。     

基于汽车减振设计的主减速器齿轮多体动力学仿真研究

主减速器齿轮是汽车传动系扭振与车身振动的重要耦合途径,在仿真研究中,主减速器齿轮的准确仿真结果能够为后续的振动分析提供可靠的数据支撑。本文对汽车主减速器齿轮的刚、柔多体动力学模型进行了仿真计算,得到齿轮啮合力,并与理论计算结果进行对比分析,结果发现柔性体齿轮模型的仿真结果与理论计算结果更为接近,误差更小,能够正确地反应准双曲面齿轮工作中齿轮啮合力的实际变化情况,能够为汽车振动噪声的深入研究提供参考。     

直齿圆柱齿轮模态的有限元法分析

利用三维设计软件Pro/E建立直齿圆柱齿轮力学模型,通过Pro/E与ANSYS的接口将模型导入到ANSYS中进行齿轮的模态分析。通过ANSYS求解得到直齿圆柱齿轮的固有频率和对应的模态振型。模态分析的结果为齿轮的设计和改进提供了新技术并提供了参考依据。     

齿轮减速器振动噪声预估公式定制方法研究

以单级齿轮减速器为研究对象,综合考虑齿轮时变啮合刚度、误差与轴承支撑等因素,通过齿轮系统动力学方法求解齿轮箱动态激励,采用FEM/BEM方法对其噪声辐射进行了数值预估。通过对比数值仿真与Kato公式计算在噪声值及变化趋势的一致性,验证了基于数值模拟方法进行减速器噪声预估公式拟合的可行性。分析了齿轮减速器振动噪声随齿轮精度等级的变化规律,建立了齿轮精度等级与减速器振动噪声的映射关系。依据齿轮误差与转速和负载的耦合作用关系,拟合了考虑齿轮精度等级的减速器噪声预估公式,实现了由减速器基本系统参数即可直接预测其辐射噪声的功能。开展了减速器振动噪声测试实验,对实验结果与拟合公式计算结果进行了对照,验证了拟合公式预估结果的准确性。     

某型发动机减速器齿轮毂裂纹故障研究

针对某型发动机减速器出现的齿轮毂裂纹故障,基于UG建立减速器齿轮传动系统的实体模型,对减速器一级齿轮毂进行柔性体仿真,采用弹簧模拟齿轮毂花键之间的弹性力作用,通过改变弹簧刚度的方法模拟一级齿轮毂存在故障时的状态,对比研究处于正常状态和带有裂纹齿轮毂故障状态的发动机减速器各部件的动态响应,发现故障状态下减速器各部件振动量明显增大,由此确立将振动量作为故障监测特征量的思想。利用所设计搭建的整机振动测试系统对10台次发动机振动状态进行测试,对比研究两种状态下减速器在其特征频带上的振动量大小,结果表明故障状态下振动量明显大于正常状态,从而验证仿真计算的正确性。     

Pro/E二次开发及在包装机械中的应用

分析比较了Pro／E常用的几种二次开发工具,针对包装机械中通用零件的特点,结合变螺距分件送料螺杆的应用实例,介绍了在Pro／E环境下,利用其二次开发工具程序（Pro／Program）进行设计的具体方法和步骤。     

基于Pro／E的钣金展开方法初探

通过对钣金件加工中Pro／E展开方法与传统展开方法的比较分析,阐明了钣金件Pro／E展开方法的优越性、实用性、经济性,总结了Pro／E钣金展开过程中应注意的事项,为钣金件展开加工提供了一种实用、高效的展开工具。     

Laser-Induced Graphene for Electrothermally Controlled,Mechanically Guided, 3D Assembly and Human–Soft Actuators Interaction

Mechanically guided, 3D assembly has attracted broad interests, owing to its compatibility with planar fabrication techniques and applicability to a diversity of geometries and length scales. Its further development requires the capability of on-demand reversible shape reconfigurations, desirable for many emerging applications (e.g., responsive metamaterials, soft robotics). Here, the design, fabrication, and modeling of soft electrothermal actuators based on laser-induced graphene (LIG) are reported and their applications in mechanically guided 3D assembly and human–soft actuators interaction are explored. Over 20 complex 3D architectures are fabricated, including reconfigurable structures that can reshape among three distinct geometries. Also, the structures capable of maintaining 3D shapes at room temperature without the need for any actuation are realized by fabricating LIG actuators at an elevated temperature. Finite element analysis can quantitatively capture key aspects that govern electrothermally controlled shape transformations, thereby providing a reliable tool for rapid design optimization. Furthermore, their applications are explored in human–soft actuators interaction, including elastic metamaterials with human gesture-controlled bandgap behaviors and soft robotic fingers which can measure electrocardiogram from humans in an on-demand fashion. Other demonstrations include artificial muscles, which can lift masses that are about 110 times of their weights and biomimetic frog tongues which can prey insects.     

含有柔性电缆的复杂系统装配仿真

将装配单元划分为“刚性组件”和“柔性电缆”,从装配对象建模、装配工艺规划和装配过程模拟三个方面对复杂系统的装配仿真方法进行系统的研究。首先,根据刚性组件和柔性电缆的不同特点,给出相应的建模方法,即针对刚性组件的CAD三维建模方法和针对柔性电缆的虚拟布线方法;然后,将装配过程视为拆卸过程的逆过程,提出含有柔性电缆的复杂系统的装配工艺规划方法,其中考虑了电缆形变过程及相应的模拟方法;最后,以装配工艺为基础对仿真对象进行装配仿真。实例表明,所提出的方法可以用于含有柔性电缆的复杂系统装配仿真。     

基于家居一体化的整体软装模块化设计研究

目的研究在家居一体化的形势下实现家居整体软装设计的有效途径。方法解析目前软装行业的发展状况和存在问题,以服务设计为导向,从用户需求出发,对产品标准化和设计模块化的特点进行系统分析,并且对影响整体软装模块化设计的产品结构、模块组合、资源配置和用户体验等多方面进行深入研究,探讨基于家居一体化的整体软装模块化的设计原则与应用策略。结论运用模块化设计原理,通过对产品平台建设和模块组合配置的研究,提出家居整体软装模块化设计的解决方案。     

传统工艺在软装中的新运用

目的在倡导设计全球化及本土化的浪潮下,寻找本国独特的设计语言,使传统工艺在传承的同时又彰显出"现代"的艺术语言。方法以传统工艺在现代软装设计中的运用为例,通过对传统工艺与软装设计现状的分析,从文化形态、材料、物用形态等方面为传统工艺的发展提出思路。结论在丰厚的传统工艺的基础上,结合现代软装的设计语言,以革新的方式重新诠释传统工艺,创造新的视觉边界,使传统工艺在现代艺术中蜕变衍生。     

双联行星减速器与RV减速器性能测试对比分析

测试与研究一种可替代RV减速器的新型双联行星减速器,通过测试两种减速器驱动功率与负载功率,计算其传动效率,分析新型双联行星减速器的综合性能.利用机器人减速器综合测试平台上的扭矩传感器,对两种减速器进行驱动功率与负载功率的测试,将结果制成折线图.通过折线图对比分析两种减速器的综合性能.研究发现:双联行星减速器的负载功率和...     

SG与RV减速器综合性能对比分析

RV减速器是工业机器人的核心零部件,国产减速器在总体性能上有待提高。对一种新型可替代RV减速器的SG减速器开展测试与分析研究,利用机器人减速器综合测试系统,测试对比SG减速器与RV减速器在空载升速过程中振动、温度、噪声及传动效率等参数的差异,分析SG型减速器的优点与不足,并提出改进方案。研究发现SG减速器在温度、噪声及负载方面更有优势,但在振动及传动效率方面尚待改进。研究结果可为国内新型SG减速器的设计与优化提供参考。     

Magnetically Driven Undulatory Microswimmers Integrating Multiple Rigid Segments

Mimicking biological locomotion strategies offers important possibilities and motivations for robot design and control methods. Among bioinspired microrobots, flexible microrobots exhibit remarkable efficiency and agility. These microrobots traditionally rely on soft material components to achieve undulatory propulsion, which may encounter challenges in design and manufacture including the complex fabrication processes and the interfacing of rigid and soft components. Herein, a bioinspired magnetically driven microswimmer that mimics the undulatory propulsive mechanism is proposed. The designed microswimmer consists of four rigid segments, and each segment is connected to the succeeding segment by joints. The microswimmer is fabricated integrally by 3D laser lithography without further assembly, thereby simplifying microrobot fabrication while enhancing structural integrity. Experimental results show that the microswimmer can successfully swim forward along guided directions via undulatory locomotion in the low Reynolds number (Re) regime. This work demonstrates for the first time that the flexible characteristic of microswimmers can be emulated by 3D structures with multiple rigid segments, which broadens possibilities in microrobot design. The proposed magnetically driven microswimmer can potentially be used in biomedical applications, such as medical diagnosis and treatment in precision medicine.     

异径管三维实体模型的计算机建模方法

介绍了管道配件异径管的结构分类及两端带直管的3 种常见结构的三维实体模型计算机绘图方法。在一串圆圈组成的骨架上铺上蒙皮的方法可以准确描述异径弯管的结构,且结构两端面与等壁厚的直管端面直接相连即可以获得完满的接头模型;通过大小两个正圆锥体相减可以准确描述同心异径管的结构,但结构两端面与等壁厚的直管需重叠相连,并把相交割出的多余边角删除后才能获得完满的接头模型;偏心异径管的壁厚变化与圆周角有关,无论其横截面与本身的轴线垂直还是与两端接管的轴线垂直,均不是等壁厚的圆形,其简便的近似建模方法是直接连接间距等于管件高度的两个大小口径的直管端面。这些模型应用到有限元数值分析中,对各种外载荷作用时的应力分布状况有直观的显示。     

Desktop‐Stereolithography 3D‐Printing of a Poly(dimethylsiloxane)‐Based Material with Sylgard‐184 Properties

The advantageous physiochemical properties of poly(dimethylsiloxane) (PDMS) have made it an extremely useful material for prototyping in various technological, scientific, and clinical areas. However, PDMS molding is a manual procedure and requires tedious assembly steps, especially for 3D designs, thereby limiting its access and usability. On the other hand, automated digital manufacturing processes such as stereolithography (SL) enable true 3D design and fabrication. Here the formulation, characterization, and SL application of a 3D‐printable PDMS resin (3DP‐PDMS) based on commercially available PDMS‐methacrylate macromers, a high‐efficiency photoinitiator and a high‐absorbance photosensitizer, is reported. Using a desktop SL‐printer, optically transparent submillimeter structures and microfluidic channels are demonstrated. An optimized blend of PDMS‐methacrylate macromers is also used to SL‐print structures with mechanical properties similar to conventional thermally cured PDMS (Sylgard‐184). Furthermore, it is shown that SL‐printed 3DP‐PDMS substrates can be rendered suitable for mammalian cell culture. The 3DP‐PDMS resin enables assembly‐free, automated, digital manufacturing of PDMS, which should facilitate the prototyping of devices for microfluidics, organ‐on‐chip platforms, soft robotics, flexible electronics, and sensors, among others.     

掺梳形减水剂水泥浆体早期水化产物形貌研究

为揭示梳形减水剂对水泥早期水化的影响规律,指导工程应用,通过SEM分析,研究了掺用3种典型结构的梳形减水剂的水泥浆体早期水化产物形貌及其电子特征数据。结果表明,梳形减水剂加速了水泥早期水化反应,且丙烯酸类、马来酸类共聚物分别促进了AFt、AFm的形成。因此,梳形减水剂品种对水泥早期水化和混凝土工程性能具有较大影响,应根据使用要求合理选用,必要时与缓凝剂、引气剂或消泡剂复合使用。