杭州美辰公司提供给太阳纸业16号机的摇振机投入使用北大核心

2014年12月15日,杭州美辰纸业技术有限公司挺供给太阳纸业16号纸机配套的HR—Shake无反作用力高频摇振机投入使用。该纸机为三叠网纸机,净纸幅宽3520mm,设计车速600m／min,最高车速可达700m／min;主要生产淋膜原纸。     

Luminescence properties of YAl3（BO3）4 phosphors doped with Eu^3＋ ions

YAl3 （BO3）4： Eu^3＋ phosphors were prepared by the conventional solid state reaction. The phase structure and morphology were investigated by X-ray diffraction （XRD） and scanning electron microscope （SEM）. Doping YAl3（BO3）4： Eu^3＋ phosphors with concentration of Eu^3＋ ions of 0, 2, 5, 8 and 10 mol% were studied and their luminescent properties at room temperature were discussed. The excitation spectrum of Y0.95Eu0.05Al3（BO3）4 was composed of a broad band centered at about 252 nm and a group of lines in the longer wavelength region. In the emission spectra, the peak wavelength was about 614 nm under a 252 nm UV excitation. The optimal doping concentration of Eu^3＋ ions in YAl3（BO3）4： Eu^3＋ phosphors was 8 mol%.     

NOVEL 6-DOF WEARABLE EXOSKELETON ARM WITH PNEUMATIC FORCE-FEEDBACK FOR BILATERAL TELEOPERATION

A particular emphasis is put on a novel wearable exoskeleton arm, ZJUESA, with 6 degrees of freedom, which is used for the robot teleoperation with the force-feedback in the unknown environment. In this external structure mechanism, the 3-revolution-prismatic-spherical （3RPS） parallel mechanism is devised from the concept of the human upper-limb anatomy and applied for the shoulder 3-DOF joint. Meanwhile, the orthogonal experiment design method is introduced for its optimal design. Aiming at enhancing the performance of teleoperation, the force feedback is employed by the pneumatic system on ZJUESA to produce the vivid feeling in addition to the soft control interface. Due to the compressibility and nonlinearity of the pneumatic force feedback system, a novel hybrid fuzzy controller for the precise force control is proposed and realized based on the Mega8 microcontroller units as the units of the distributed control system on ZJUESA. With the results of several experiments for master-slave control with force feedback, the feasibility of ZJUESA system and the effect of its hybrid fuzzy controller are verified.     

万能材料试验机在不同工况下的内力分析

万能材料试验机是检测工程材料力学性能参数的常用测试设备.在对材料进行拉伸或压缩等基本变形实验时,万能试验机自身各构件同样要受到被检测材料的反作用力.试验机的各构件受力情况也是要探讨的问题.结果证明:试验机活动立柱始终承受拉应力,固定立柱只有在拉伸时受压缩应力,下夹头的升降蜗杆在拉仲时受拉应力.     

建筑学中的日常意识研究

高速化的城市建设使建筑学渐渐与生活脱节。20世纪60年代,意识到这一点的建筑师将“日常生活”概念引入建筑学,开启了一场建筑学“日常意识”觉醒的斗争。但受到资本诱导的“日常”本身充满陷阱,盲目追随只会使建筑学再一次成为政治经济的傀儡。保持建筑学的独立思考,同时接受来自“日常意识”的监督,才是建筑学理性、公正、克制的“日常意识”。     

七自由度虚拟外骨骼运动仿真研究

研究人体运动的真实关节状态,针对地面反作用力对外骨骼系统的影响,单纯数学模型不准确。为解决上述问题,提出了根据机械模块(SimMechanics)的建模方法。利用D-H(Denavit Hartenberg model)运动模型建立外骨骼的机械连杆模型,并作为虚拟建模的对象。引入速度阈值,解决地面反作用力的不连续问题,采用PD控制方法进行控制。利用SimMe-chanics中的驱动器模块、传感器模块、关节模块建立完整虚拟外骨骼机械仿真模型进行仿真。仿真结果显示虚拟外骨骼的关节运动状态能够有效的跟踪上期望值,证明方法能够真实体现人体的运动形态动特性。     

扭矩扳手在设备维修中的应用

分析了常用扭矩扳手的工作原理、分类以及实际运用,研究了如何控制螺栓连接紧固性问题,介绍了扭矩扳手的特点、正确使用及后期维护等问题.研究表明:扭矩扳手在露天采矿设备维修的合理应用,可达到节省人员劳动强度及时间、有效提高工作效率、提高设备稳定性等目的.