1)  axis of gravitty
重心轴
2)  axial conversion formula of inertial moment integral
扇形箱格对自身重心轴的惯性矩(Ix
3)  center of gravity
重心
1.
Study on Spatial Change of the Center of Gravity of Manufacturing Employment Distribution in Beijing——Based on Economic Unit Census;
北京市制造业就业分布重心变动研究——基于基本单位普查数据的分析
2.
Measure technology of the center of gravity of ejection seat-pilot system;
弹射座椅与飞行员系统重心测量技术
3.
Analysis about Parameter of Body Center of Gravity for Toeloop Jump;
后外点冰跳人体重心各参数的研究
4)  barycenter
重心
1.
The theorems of barycenter and volume of simplex;
单纯形的重心定理和体积定理
2.
According to the theorem about triangle barycenter and other practical situations, this paper introduced a geometry method of designing the location of force sensors of weighing hopper in automatic mixing and feeding system.
介绍根据三角形重心定理结合现场实际情况用几何作图方法确定连续自动配料系统中称重料斗的实际重心及弹性受力元件的安装位置,使两者尽量重合于同一垂直轴线,达到减少重量测量误差,提高测量精度和配料效果的目的。
3.
With MasterCAM software, this paper analyzes the barycenter, mass, superficial area and rotary inertia of the figure with with irregular plane or the object with complex form, which provides an effective approach to calculate these parameters.
用MasterCAM软件分析了平面不规则图形或复杂物体重心、质量、表面积和转动惯量,为准确计算这些参数提供了一种有效的途径。
5)  centre of gravity
重心
1.
As the jack-up platform has a higher centre of gravity and a larger windward area, owner, designers and operators are extremely concerned for its floating stability.
自升式平台由于重心高、受风面积大,它的漂浮稳性一直是业主、设计者和操作者最为关注的问题之一。
2.
By applying "the visual environment analytical method" and "the approxiamate centre of gravity",the visual environment in city plaza,setting the construction of the Bell and Drum Tower is mainly discussed as an example,it points out that great attention must be payed on visual environment of architecture during the renewing and protection process of the historical areas.
以“近似重心法”为手段,运用视觉环境分析方法,结合西安市钟鼓楼广场建设工程,探讨了城市广场的视觉环境问题。
3.
according four original movements of Taijiquan experimented by the author for many years, the author cliscorers the exertion sequence, centre of gravity, the exercise muscles and joints.
从中研究出掩手肱捶动作的用力顺序、重心移动路线以及参与发力肌肉与关节部位。
6)  gravity center
重心
1.
To determine the pilot dimensions on which the kinetic stabilization adjustment design of ejection seat depends,regression analysis of 292 pilots dimensions and their combined gravity centers of pilot-seat systems were conducted.
为确定火箭弹射座椅动力稳定调节方法设计所应依据的人体参数,对292例飞行员的人体参数及人椅系统组合重心数据进行了回归分析研究,综合确定了以体重和身高作为调节依据参数,并求出了该参数与人椅系统组合重心的回归方程。
2.
Based on the railway transportation data from 1978 to 2005,the four targets,such as passenger,passenger kilometers,freight traffic,freight ton kilometers are analyzed;and gravity center model,coefficient of variation and the weighted coefficient of are applied to in order to measure and evaluate the regional railway transportation disparities.
利用1978~2005年的铁路运输数据,采用重心模型、变异系数和加权变异系数,从客运量、客运周转量、货运量和货运周转量4个方面,对中国铁路运输的区域差异进行了统计分析和评价。
3.
The horizontal movement of body′s gravity center can be tested and used to analyse the relationship between human body stability and automobile parameters.
通过测试人体重心的水平运动,可以分析人体的稳定性与车辆参数的关系,有助于在车辆设计中提高乘坐舒适性。
参考词条
补充资料:MasterCAM8.0在四轴、五轴铣床加工中的应用与技巧

MasterCAM8.0新增加了多轴加工模块,但在实际加工应用中数控机床的控制器是不同的,在后置处理时,如果在MasterCAM8.0提供的后置处理文件夹Posts中找不到适合数控机床控制器的后置处理文件,或者经过编辑某通用后置处理文件后,仍不能得到与数控机床控制器相适应的后置处理文件,那么就无法将多轴加工模块得到的NCI文件转化成实际加工中可用的NC程序。
  笔者在工作实践中,通过适当的转化使某些常用、典型的四轴、五轴加工在MasterCAM8.0上得以实现,并且成功后置处理成适合加工实际的四轴、五轴数控铣床控制器格式的NC程序。
  一、四轴加工的应用
  卫生巾切刀成型辊的数控加工主要是通过用平铣刀和锥度成型刀在XK-715M机床(带旋转轴的三坐标数控机床)上实现的。旋转轴上夹持的切刀成型辊相当于第四轴——A轴,刀具在圆柱体上走空间曲线,就得到刀刃的型面。
  那么,如何建出这条卷在圆柱体上的空间曲线呢?
  首先,在MasterCAM8.0中,根据切刀理论刃口展开图画出不同刀具的中心轨迹展开图,这是二维曲线。
  然后,利用主菜单的转换→卷筒→串连,用串连的方式选取刀具轨迹曲线→然后设定卷筒直径、旋转轴X及曲线放置在圆柱体上的位置→确认后再作出与卷筒直径同样大小的圆柱曲面,作为4轴曲线加工的导动曲面,将空间曲线以投影方式投到圆柱面上进行加工。
  虽然同样是FANUC系统,但XK-715M机床和加工中心控制器的所使用的格式稍有区别,所以在用MasterCAM后处理产生NC程序之前需修改后置处理文件MPFAN.PST。


  方法如下:进入文件→编辑→*.PST→找到系统默认的MPFAN.PST文件,先作备份,如另存为MPFAN-1.PST文件,然后打开,找到下面清单中的变量rot_ccw_pos : 1,将其改为rot_ccw_pos : 0,并存盘。
  # Rotary Axis Settings
  # --------------------------
  vmc   : 1   #0 = Horizontal Machine, 1 = Vertical Mill
  rot_on_x : 1   #Default Rotary Axis Orientation, See ques. 164. #0 = Off, 1 = About X, 2 = About Y, 3 = About Z
  rot_ccw_pos : 1   #Axis signed dir, 0 = CW positive, 1 = CCW positive
  之后,进入“NC管理”菜单→更改后置处理文件→选中MPFAN-1.PST文件,再对NCI文件进行后置处理,产生符合XK-715M机床的NC格式。
  二、 五轴加工的应用
  以在FIDIA系统的T20上加工双角度叉耳内外形为例,说明用MasterCAM8.0实现T20上带固定角度的五轴加工。

说明:补充资料仅用于学习参考,请勿用于其它任何用途。