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Instantaneous motions of the end effector of the typical industrial serial 6-DOF and 5DOF robots are also studied using reciprocal screw theory, The constrained and permitted motions at special configurations are given. Furthermore, the satisfied conditions for the special configurations are discussed, and in the reference coordinate system general expressions of the reciprocal screw and existed motion screw and the subspaces of the permitted rotational axes are obtained under all circumstances at special configurations.

本文中还用反螺旋理论研究了六自由度和五自由度工业机器人的瞬时运动,给出了它们在正常位形和特殊位形下的受约束的运动和存在的运动,以及它们在所有运动参数的不同组合下的反螺旋及存在运动螺旋系的一般表达式和转动轴线存在的子空间。

The detail contents can be summarized as follows: Using Grassmann line geometry method to analyze joint axes linear dependence in manipulator singular configurations; The manipulator constrain equations are derived base on the reciprocity of twists and wrenches; The null space method is used to obtain the reciprocal screws when singularity occurs.

具体内容包括以下几个方面:用Grassmann线几何方法分析了机器人机构奇异时关节轴线的线性相关性;用螺旋理论推导出了基于力螺旋和运动螺旋表示的反螺旋约束方程式;用零空间理论求出了机器人奇异位形的反螺旋。

Continuous screwy chip which is chip' s natural shape and geometrical para meter describing it are advanced.

指出切屑的自然状态是连续螺旋形切屑,描述了连续螺旋形切屑形状的参数。

A compensation method of ball radius in measuring an arbitrarysectional shape of spiral surface is introduced.

但由于螺旋面的扭曲及测头半径的影响,采用一股的平面曲线侧量方法对测头半径进行补偿和数据处理,求得的齿形其误差较大,很难满足要求;另外,对螺旋面任意截形的测量目前还没有一个通用的补偿计算公式。

A spiral formation, such as one of the whorls of a gastropod shell .

螺旋形一种螺旋形状,如一个涡螺壳上的螺旋

Used especially of flowers whose parts are arranged in spirals rather than in whorls, as in magnolias.

非轮列的非轮状的,特指花朵的排列是螺旋形的而非轮状的,如木兰花

According to the dynamics analysis of the cotton sliver coiling process,by considering the minimum friction of cotton sliver caused by screwy pipes as objective function the design of screwy pipes of can coiler is explained based on the theory of the variational direct-method.

对棉条圈条过程定量地进行了动力学分析,以棉条所受曲线斜管摩擦力最小为目标函数,基于变分问题直接法原理设计出圈条盘螺旋形曲线斜管。这种螺旋形曲线斜管充分利用圈条盘的转动对棉条产生的离心力甩摆作用,使棉条所受曲线斜管摩擦力较小,从而使出条更顺畅;在一定程度上降低了圈条盘螺旋形曲线斜管堵眼频率与条筒乱条几率,使其更适应现代并条机生产高速化的要求

The utility model relates to an enclosed electric stove with electric heating tube which is characterized in that a semicircle sectional discoid spiral electric heating tube is used as a heat source.

实效模型用被表示的特色的电的暖气管与一个被附上的电火炉有关在半圆形部份的铁饼状的螺旋形的电暖气管被当作一个热来源使用。

Does spiral movement synchronously,a nonlinear model was established by neural networks to describe the relationship between the helical groove and the milling cutter'sprofile,and according to the helical groove axial cross section to simulate the milling cutter's profile.

加工螺旋槽时,针对铣刀刃形的设计,应用包络面原理,采用神经网络方法建立了工件螺旋槽形与铣刀刃形之间的非线性关系模型,并通过工件螺旋槽端面截形模拟仿真出铣刀回转面刃形。

Star trails spiral across the night sky above Joshua Tree National Park in California 'x#x,H!

意译:星星的螺旋形的轨迹越过夜空,在国家的加利福尼亚公园的树丛上面。

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As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸,那乌黑、忧郁的眼睛,她便会相信,他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失

But because of its youthful corporate culture—most people are hustled out of the door in their mid-40s—it had no one to send.

但是因为该公司年轻的企业文化——大多数员工在40来岁的时候都被请出公司——一时间没有好的人选。