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激光熔覆制备TiC增强Ni-30Fe-20Al复合材料的组织与性能研究
No full text为研究激光熔覆制备TiC增强Ni–30Fe–20Al复合材料的组织和力学性能,探索TiC含量对复合材料性能的影响规律,利用激光熔覆技术分别制备了TiC质量分数为0、10%、20%的陶瓷颗粒增强Ni–30Fe–20Al复合材料,并对复合材料的宏观形貌、微观组织、物相组成、显微硬度等进行了表征分析。结果表明,熔覆层与基板形成了良好的冶金结合;TiC颗粒大部分以TiC相的形式存在且弥散分布在熔覆层内;有部分TiC颗粒重熔形成了不同原子比例的新相,使熔覆层的硬度进一步提升;随着加入TiC粉末比例的增加,熔覆层硬度呈增大趋势
2,5-呋喃二甲酸二癸酯和滑石粉协效调控聚乳酸结晶行为研究
No full text聚乳酸(PLA)结晶速率慢和结晶度低问题,导致制品耐热性差,在一定程度上限制了应用范围。利用滑石粉(Talc)和生物基来源2,5-呋喃二甲酸二癸酯(DDF)对PLA的结晶行为进行了研究。结果表明,单独添加1%Talc,结晶度变化较小,单独添加DDF,结晶度显著提升,但半结晶时间延长。同时添加Talc和DDF后,PLA结晶度由5.21%提升至31.78%,半结晶时间(t_(1/2))由134 s降低至31 s。说明DDF和Talc协同提高了PLA结晶度和加快PLA结晶速率
碳纤维增强复合材料水导激光切割试验研究
No full text采用正交试验方法对影响水导激光切割碳纤维增强复合材料(CFRP)的关键工艺参数进行了深入研究,得出了进给速度、水射流速度、脉冲频率和激光功率对切割CFRP的影响规律,并用直接对比法和极差分析法所得最优参数进行单次划槽切割对比。研究结果表明:在极差分析法所得最优参数下切割CFRP时,切缝深度增大3.2%、切缝宽度减小9.2%、切缝锥度减小11.8%、线粗糙度减小40.2%。通过与干式激光加工方法对比发现,水导激光加工技术在切割CFRP方面优势明显,由于水射流的冲刷和冷却作用,材料切割表面几乎无热影响区和纤维拔出。另外,采用正交试验所得最优工艺参数实现了4mm厚度CFRP的无锥度切割
多孔石墨烯/聚合物电磁屏蔽材料研究进展
No full text电子与通讯技术的快速发展带来了大量电磁辐射,不仅对电子设备造成干扰,影响设备精度,甚至威胁着人体健康,因而对电磁屏蔽材料的需求日益增加。航空航天、便携式电子设备等更要求电磁屏蔽材料的轻量化。石墨烯作为新型的碳纳米材料,具有优异的微观结构和介电性能,因此在电磁屏蔽材料领域受到了广泛关注。本文综述了石墨烯/聚合物泡沫电磁屏蔽材料、石墨烯/聚合物多孔薄膜电磁屏蔽材料、石墨烯气凝胶/聚合物电磁屏蔽材料等三类多孔石墨烯/聚合物电磁屏蔽材料的研究进展。并对未来多孔石墨烯/聚合物电磁屏蔽材料的发展趋势做出了展望
A Review of Compliant Control for Collaborative Robots
No full textCollaborative robots that can directly interact with humans have become a new trend in the robotics field. To achieve safe and friendly human-robot interaction, the compliant control of collaborative robots is extremely important, especially the pliant control of each joint. Also, the n tier of puhlicat' has increased yearly. In this article, we summarize the c pliant control methods that have been proposed and applied in the robot system and classify c pliant control methods into three categories: force-based which needs to know the joint torque/force and limited by the perl'ormance of force controller; model-based which can achieve high control accuracy but limited by the model accurate; external force-based which can increase the transparency but needs to know the external force. Then we propose possible future research directions
Design and Stiffness Analysis of a Cable-Driven Continuum Manipulator
No full textCompared with traditional rigid link manipulators, cable-driven continuum manipulators have many advantages, such as lightweight mechanical structure, large reachable workspace, high dexterity, and high maneuverability. It is especially suitable to the applications requiring high maneuverability over complex and confined spaces. In this paper, the end stiffness of a cable driven continuum manipulator is modeled and its influencing factors are analyzed. The flexible backbone is used as the support of the manipulator, and the deformation of the flexible support skeleton is precisely controlled by the piecewise drive scheme. Through the analysis, it can be seen that the main factor affecting the stiffness of the manipulator is the joint variable of the module, so we get two kinds of stiffness control schemes for the manipulator
