基于形状记忆合金的软复合结构驱动器设计

本文针对现有康复治疗设备中动力驱动装置便携性差、缺乏仿生运动驱动等技术难题,基于形状记忆合金(SMA)及其仿生驱动机理,设计了一种用于康复训练的新型人体关节运动SMA软复合结构驱动器。首先,本文为该软复合结构设计了由产生驱动力的驱动层、确定结构弯曲角度的导向层和连接这些层的基体材料组成的构型。其次,建立了基于经典层合理论的SMA软复合结构的输出力学模型,解析了软复合结构的弯曲运动,并通过MATLAB进行了数值计算。最后,制作了样机,并通过搭建实验平台对其进行性能测试。实验结果表明该驱动器在空载情况下弯曲角度达到了189.91˚,负载0.45 kg下弯曲角度109˚,证明了其可在轻量级人体外骨骼结构中产生需要的弯曲运动的可能性。

微纳复合结构中间相球形软碳的性能

为研究微纳复合结构中间相球形软碳材料的电化学性能以及用于储能锂离子电池的优势,对软碳材料的结构、扣式半电池和成品全电池的性能进行测试。制备的球形软碳外形圆整、分布均匀,球径较小,经炭化后的微球结晶度增大,炭材料的整体结构变好。制作的扣式半电池在0.005~2.000 V充放电,0.1 C首次库仑效率约为87.1%,2.0 C充电容量为1.0 C时的84.8%,0.5 C循环50次的充电容量保持率为99.9%。装配的50 Ah全电池在2.3~4.2 V充放电,2.00 C、3.00 C放电容量保持在80%以上,在-20℃时,放电容量仍可达到80%以上,以0.50 C循环600次的容量保持率为97.7%。

High frequency properties of Fe_(73.5)Cu_1Nb_3Si_(13.5)B_9/Zn_(0.5)Ni_(0.5)Fe_2O_4 soft magnetic composite with micro-cellular structure

Soft magnetic composite with micro-cellular structure was prepared by spark plasma sintering(SPS) process with Fe73.5Cu1Nb3Si13.5B9 micron-powders clad by 5wt% Zn0.5Ni0.5Fe2O4 nano-particles.The effect of SPS on the micro structure of the Finemet powder and the micro structure of the composite were studied.It has been found that the as-prepared composite consists of Fe73.5Cu1Nb3Si13.5B9 cells and the cell-wall composed of nano Zn0.5Ni0.5Fe2O4 particles distributing around Fe73.5Cu1Nb3Si13.5B9 cell-body.The composite exhibits low eddy-current loss which is to be resulted by high resistivity of the Zn0.5Ni0.5Fe2O4 cell-wall.The sintered samples were annealed at different temperature and the magnetic properties at different frequency of the annealed samples were measured.It shows that the Zn0.5Ni0.5Fe2O4 cell-wall possesses good thermostability.