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finger-joints
相关语句
  指接
     Application of the digital speckle correlation method on timber with finger-joints
     数字散斑相关方法在木材指接中的应用
短句来源
     Study on Mechanical Performance and its Modelling of Glulam with Finger-joints
     关于指接集成材力学性能及其分析模型的研究
短句来源
     Study on Mechanical Performance and its Modelling of Glulam with Finger-joints(Continued)
     关于指接集成材力学性能及其分析模型的研究(续)
短句来源
     The research used the digital speckle correlation method to analyse the mechanical characteristics of timber with finger-joints.
     该文将数字散斑相关方法应用于指接木材的力学性能分析.
短句来源
  相似匹配句对
     Finger Drills
     儿童钢琴入门教程——“手指操”
短句来源
     finger performance training;
     手指弹奏能力训练;
短句来源
     Study on replantation of the finger-end severing.
     指末节断离再植探讨
短句来源
     On Ecology of Five-finger Mountain Fairyland
     五指山仙颜话生态
短句来源
     On Loessial Joints
     论黄土节理
短句来源
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This paper indicates that: as the joint strength is controlled by tension across the net section, the load-carrying capacity of finger joints can be fully utilized, thus a gentle slope should be selected to avoid the failure along the glue line beside the,finger; not only the area of the net section increases, but also the concentration of stresses beside the notch relaxes as the tip thickness decreases. The finite element method has been developed to determine the coefficients of non-uniform distribution of...

This paper indicates that: as the joint strength is controlled by tension across the net section, the load-carrying capacity of finger joints can be fully utilized, thus a gentle slope should be selected to avoid the failure along the glue line beside the,finger; not only the area of the net section increases, but also the concentration of stresses beside the notch relaxes as the tip thickness decreases. The finite element method has been developed to determine the coefficients of non-uniform distribution of stresses between trapezoid notches in front of the finger tips and thus the joint efficiency has been obtained which fairly comformed with our experiments. A formula for calculating the joint efficiency has heen developed in terras of the orthogonal design method, therefore we can des(?)gn a finger joint with suitable joint efficiency to meet the requirements of the structure. Based on the results of theoretical and experimental investigation, two series of finger joints are recommended.

本文对木材胶合指形接头的受拉工作进行了深入的研究,指出指形接头只有当受净截面抗拉强度控制时,才能充分利用其承载能力,因此应选用平缓的指边坡度以防沿胶缝剪坏;减小指端宽度非但能增大指接受力面积,并使指端缺口旁的应力集中得到缓和. 作者采用有限元法的定指端梯形缺口间应力不均匀分布系数和指接的传力效能,所求得的数据与试验结果甚为相近. 作者利用有限元法求得传力效能,采用正交设计方法导得指接传力效能的计算公式,从而使能根据结构的要求设计出所需传力效能的指形接头. 在理论分析和试验研究的基础上,提出了指形接头的两个系列.

On the basis of the structure of the normal human hand,this paperanalyzes the flexible angle relations of joints under the basic movements of afinger.A model of the flexible manipulator with three finger joints is thuspresented and the changes of its mechanism posture under external forces orconstraints are qualitativey analyzed.Compared with the existing two-fingerholder,whether in function or in appearance,this manipulator can not onlyactually simulate the movements of the human hand,such as stretching out,drawing...

On the basis of the structure of the normal human hand,this paperanalyzes the flexible angle relations of joints under the basic movements of afinger.A model of the flexible manipulator with three finger joints is thuspresented and the changes of its mechanism posture under external forces orconstraints are qualitativey analyzed.Compared with the existing two-fingerholder,whether in function or in appearance,this manipulator can not onlyactually simulate the movements of the human hand,such as stretching out,drawing back or grasping,but can also grasp objects of various shapes orweights in an envelope manner and meet the demand of increasing force.Bes-ides,according to the structural characteristics of the flexible manipulator,the synthetic methods of the flexible manipulator are described and twobasic methods,i.e.,the method of selecting elastic components and the me-thod of optimizing structure parameters,are presented.

本文从正常人手的结构特点出发,分析了手指基本运动下各关节弯曲角之间的关系.据此,提出一种具有三个指关节的柔性操作器模型,并对其机构姿态在外力作用下或者外界约束下的变化作了定性的分析.该操作不仅能较为逼真地模拟人手的自由伸屈或抓取等动作,而且可以包络方式抓取多种外形物体并实现增力要求.另外,针对柔性操作器的结构特性,文中还对该柔性机构的综合方法进行了论述,提出了两种基本综合方法:弹性元件选择法和结构参数优化法.

Dexterous robotic hand can stably grasp an object with arbitary shape,and manipulate the object by mov-ing its fingers.The kinematics and force propagation are far more complex than general robotic mechanismswith one open kinematic chain.This paper analyzes four relationships concerning with forces and virtual dis-place ments between the finger-tips and the gtasped object,the finger-tips and the fingers' joints.Using lin-ear transformation theory,the paper reveals the generant conditions of overconstraint,underconstraint,andsingularity.The...

Dexterous robotic hand can stably grasp an object with arbitary shape,and manipulate the object by mov-ing its fingers.The kinematics and force propagation are far more complex than general robotic mechanismswith one open kinematic chain.This paper analyzes four relationships concerning with forces and virtual dis-place ments between the finger-tips and the gtasped object,the finger-tips and the fingers' joints.Using lin-ear transformation theory,the paper reveals the generant conditions of overconstraint,underconstraint,andsingularity.The grasping effects of redundance,deficiency of freedom,and singular configuration of fingermechanisms are examined.The results developed in the paper can be used for the design of dexterous robotichand and the planning of the control scheme.

机器人灵活手可以稳定地抓持任意形状物体,或利用手指的运动操纵物体相对于机器人末杆(或手掌)的运动.它的运动学和力传递关系比一般开链机器人复杂得多.本文分析了在被抓持物体与手指指尖,手指指尖与手指关节之间力和虚位移的关系.利用线性变换的理论揭示了过约束、欠约束和奇异状态的形成条件.本文还分析了手指机构冗余自由度、亏缺自由度和奇异位形对抓持的影响.这些结果为机器人灵活手的设计和控制方案的规划提供了理论依据.

 
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