零机械能输出感应电机

传统电机是机-电能量转换,损耗与温升是电机设计时需要削弱和避免的问题。该文从传统电机损耗与温升出发,提出了用于加热的零机械能输出感应电机。利用绕组所产生的径向磁场在实心结构的定子和转子铁心中感应产生涡流,将输入的电能全部转化为热能,具有定子、转子双边加热的特点。其独特的双边加热效果可解决挤塑类设备旋转螺杆加热瓶颈问题。建立了系统等效模型,给出了电磁功率解析表达式,采用有限元法分析了系统涡流分布与铁心端部效应。对样机进行加热实验,结果证明该种电机与传统线圈缠绕式电磁加热相比,具有节能高效、预热时间短、径向温差小等优点。     

自适应约束下的双边全变差正则化超分辨率重建

在经典的双边全变差( BTV)超分辨率重建中,加权系数和正则化参数的恒定性导致重建结果边缘保持能力受限。为此,提出了一种自适应约束的BTV正则化先验模型。算法首先定义了图像的局部邻域残差均值以区分当前像素属于平坦区域还是边缘区域;然后针对加权系数的不变性导致边缘削弱的问题,利用边缘方向和垂直边缘方向扩散性的不同,设计自适应权重矩阵;最后根据代价函数的极值问题推导出迭代公式,从而进行图像的超分辨率重建,重建过程中采用自适应的方法确定正则化参数,以便求得代价函数的全局最优解,提高了算法的鲁棒性。实验结果表明：与双三次线性插值法和经典BTV算法相比,该算法取得了更好的视觉效果和更高的峰值信噪比,更多地保留了图像的边缘细节信息。     

一种面向新一代可伸缩视频编码的上采样设计

可伸缩视频编码属于新一代H.265/HEVC视频编码标准中的关键技术。本文分析了其相关技术,针对传统空间可伸缩视频编码中的上采样过程运算复杂、时间延迟等缺点,借鉴双边滤波器,将内容自适应嵌入到上采样过程中,提出了一种新的非线性和内容自适应设计方法。通过理论推导得出了改进后滤波器的表示公式,并设计出了新的上采样实现流程。通过仿真实验验证了理论推导的正确性,并与传统方法进行了比较,结果表明该方法可有效地提高编码效率、降低系统复杂性。     

针对合成孔径雷达图像的新型LOG边缘检测算法

传统LOG边缘检测算法对合成孔径雷达图像进行边缘检测时,对噪声敏感,同时也易损坏部分低强度边缘。针对这一问题,提出了一种新型的 LOG边缘检测算法,首先采用双边滤波和自适应中值滤波来代替传统LOG算子中的高斯滤波,再计算平滑后图像的拉普拉斯,最后提取运算后的零交叉点作为图像的边缘。仿真实验表明,本文方法在脉冲噪声环境下具有显著的去噪效果,而且能较好地保护边缘,提高了检测精度,相对传统LOG算法具有更好地检测效果。     

Simultaneous bipedal locomotion based on haptics for teleoperation

ABSTRACT

This paper proposes a novel, simultaneous bipedal locomotion method using haptics for remote operation of biped robots. In general, traditional biped walking methods require very high computational power and advanced controllers to perform the required task. However, in this proposed method, a master exoskeleton attached to the human’s lower body is used to obtain the trajectory and haptic information to generate the trajectory of the slave biped robot in real time. Lateral motion of the center of mass of the biped is constrained in this experiment. Also, it is considered that no communication delay is presented in between the two systems in this experiment, and they are not discussed in this paper. Since a direct motion transmission is used in the proposed method, this method is quite straight forward and a simultaneous walking can be realized at the same time with high performance. Also, it does not require an exact dynamic model of the biped or specific method to plan the trajectory. The gait pattern of the biped is directly determined by that of the human. Also, the operator can feel the remote environment through the exoskeleton robot. Results obtained from the experiments validate the proposed method.     

双侧采空不规则煤柱稳定性分析

为确定某矿3303工作面不规则煤柱处于两侧采空状态时的稳定程度,通过数学模型对不规则煤柱最小安全尺寸及煤柱稳定性系数进行计算,在此基础上,以数值模拟对不规则煤柱两侧采空状态下的应力变化规律展开分析。结果表明:煤柱最小安全尺寸为31.2 m,大于3303工作面推进36.5 m范围内不规则煤柱尺寸;煤柱稳定性系数为1.14,根据煤柱稳定性判别指标判定煤柱为稳定状态;不规则煤柱应力随工作面推进距离增大呈上升趋势,最大应力值与理论计算煤柱承载强度最小值基本一致;综合评定双侧采空状态下,不规则煤柱能够保持稳定。     

Integrated reproduction of human motion components by motion copying system

Currently, the development of leading‐edge technology for recording and loading human motion on the basis of haptic information is required in the fields of manufacturing and human support. Human movement is an assembly of motion components. Since human movements should be supported by a robot in real time, it is necessary to integrate the motion components that were saved earlier. Once such motion integration is realized, future technology for use in daily human life can be developed. This paper proposes the integrated reproduction of the decomposed components of human motion by using a motion copying system. This system is the key technology for the realization of the acquisition, saving, and reproduction of real‐world haptic information. By using the proposed method, it is possible not only to achieve expert skill acquisition, skill transfer to robots, and power assist for each motion component, but also to open up new areas of applications. © 2012 Wiley Periodicals, Inc. Electr Eng Jpn, 181(1): 28–35, 2012; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/eej.21263     

推进农网双向改造,加快三网融合业务发展

三网融合在即,在做好城市有线电视网络双向改造的同时,广电应根据自身的实际情况积极推进农村有线电视双向网络,以期符合三网融合业务发展的网络基础要求。     

水平双向地震作用对摩擦摆基础隔震结构隔震支座位移的影响

对不同场地条件下、不同周期的摩擦摆基础隔震结构在水平双向和单向地震作用下的隔震支座位移进行了对比分析,表明水平双向地震作用下隔震支座的总位移均明显大于水平单向地震作用下的支座位移。因而,在简化设计中确定摩擦摆基础隔震结构隔震支座位移时,可将水平单向地震作用下的隔震支座位移增大30%,以考虑水平双向地震作用对摩擦摆基础隔震结构隔震支座位移的影响。     

矩形截面框架柱双向受剪承载力研究

GB50010-200x《混凝土结构设计规范》(征求意见稿)对矩形截面钢筋混凝土框架柱双向受剪承载力计算公式进行了修正,修定后的公式仅对由混凝土提供的双向受剪承载力进行了折减。本文通过7根加载角度不同的矩形截面框架柱在斜向水平荷载作用下的受剪承载力试验,探讨修订公式计算矩形截面框架柱双向受剪承载力的可行性,试验结果和计算值的对比表明,修正后的公式可以安全计算矩形截面框架柱双向受剪承载力,而且具有一定的精度。