公差

By using the CFD software FLUENT, the inner-flow field of centrifugal fans with ruled-surface impeller versus with enveloping surface impeller has been simulated. The static pressure distribution, the dynamic pressure distribution, the total pressure distribution, the turbulent intensity and the speed vector of the two kinds of centrifugal fans are then analyzed and compared. From the calculating results, we found that the pressure distribution, the speed vector and other parameters of the two kinds of centrifugal fans are basically same. This implies that the tool-path generating arithmetic for the machining of the impeller can meet the aerodynamic requirements of the centrifugal fan. Furthermore the method can provide proof for designing department to establish sound manufacturing tolerance for impeller.

最后采用CFD软件FLUENT，利用标准k-ε湍流模型，采用分离隐式求解器，分别对直纹面叶轮离心通风机和包络面叶轮离心通风机整体风机内部三维流场和单个通道流场进行了数值模拟计算，在计算结果的后处理中，对相同坐标值处的静压力、动压力、湍流强度和速度矢量等参数进行了分析与比较，结果表明：在相同的计算参数条件下所得到直纹面叶轮离心通风机和包络面叶轮离心通风机内部流场差别不大，从而揭示所采用的叶轮数控加工的刀位规划方法的规划误差对流体机械动力性能的影响不大，这也为设计部门制定合理的叶轮加工公差提供了依据。

I need more "business" trips like his to nourish my wandering expat heart.

我需要更多这样的"公差"去滋润我漂泊异乡的心灵。

With Finite Element Method, a series of stability analysis for a cylindrical shell, which is similar to the real construction of a submar hull is carried out .

模拟 实际潜艇结构、载、装的设备、造公差及腐蚀等进行了一系列的计算和实验验证。

Tolerance of Luminous Flux is ±15%.

光通量的公差为±15%。

The drawback is the very close tolerances necessary in the linkage system to achieve proper timing, which increases the cost of the weapon, and considering the relatively low power of the 9x19 ammunition used in this gun (compared to original Lmg 25 machine gun that fired full-power 7.5x55 cartridges) it appears to be a gross engineering over-kill for a submachine gun.

其缺点是非常密切的联系，公差在系统实现适当的时间，从而增加了武器所必需的费用，并考虑在这枪支弹药使用的9x19功耗相对较低（相比原来的轻机枪25机枪的锅炉全部功率7.5x55墨盒）这似乎是一种严重的工程超额1冲锋枪杀死。

And tolerances are not critical as is the case with gear drivers.

而且公差的要求也不像齿轮传动装置那样严格。

Machining of materials is basically adopted to get higher surface finish, close tolerance and complex geometric shapes, which are otherwise difficult to obtain.

采用材料加工手段基本上是为了取得较高的表面质量，严紧的公差和复杂的几何形状，这些是用其他加工方法很难得到的。

Detail drawing ; Dimension and tolerance representation ; Geometric epresentation ; Geometric modelling ; Information input processing ; CAD/CAM

零件图；尺寸公差；几何表达；几何造型；信息输入处理；计算机辅助设计/计算机辅助制造

According to the characteristics of tolerance in shape and relative position in engineering drawings,a new vector-based recognition algorithm based on key graphics characteristics and label character was proposed and implemented.

根据机械工程图中形位公差符号的特点，在矢量基础上，提出并实现了一种基于关键图形特征和标注字符相结合的识别算法。

According to the characteristics of tolerance in shape and relative position in engineering drawings, a new vector-based recognition algorithm based on key graphics characteristics and label character was proposed and implemented.

根据机械工程图中形位公差符号的特点，在矢量基础上，提出并实现了一种基於关键图形特徵和标注字符相结合的识别算法。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。